project64/Source/Glitch64/OGLcombiner.cpp

#ifdef _WIN32
#include <windows.h>
#else // _WIN32
#include <string.h>
#include <stdlib.h>
#endif // _WIN32
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "glide.h"
#include "main.h"

static int fct[4], source0[4], operand0[4], source1[4], operand1[4], source2[4], operand2[4];
static int fcta[4],sourcea0[4],operanda0[4],sourcea1[4],operanda1[4],sourcea2[4],operanda2[4];
static int alpha_ref, alpha_func;

float texture_env_color[4];
float ccolor0[4];
float ccolor1[4];
static float chroma_color[4];
int fog_enabled;
static int chroma_enabled;
static int chroma_other_color;
static int chroma_other_alpha;
static int dither_enabled;
int blackandwhite0;
int blackandwhite1;
#ifdef _WIN32
static float farF;
static float nearF;
#endif // _WIN32

int need_lambda[2];
float lambda_color[2][4];

// shaders variables
int need_to_compile;

static GLhandleARB fragment_shader_object;
static GLhandleARB fragment_depth_shader_object;
static GLhandleARB fragment_bw_shader_object;
static GLhandleARB vertex_shader_object;
static GLhandleARB program_object_default;
static GLhandleARB program_object_depth;
static GLhandleARB program_object_bw;
static GLhandleARB program_object;
static int constant_color_location;
static int ccolor0_location;
static int ccolor1_location;
static int first_color = 1;
static int first_alpha = 1;
static int first_texture0 = 1;
static int first_texture1 = 1;
static int tex0_combiner_ext = 0;
static int tex1_combiner_ext = 0;
static int c_combiner_ext = 0;
static int a_combiner_ext = 0;

static const char* fragment_shader_header =
"uniform sampler2D texture0;       \n"
"uniform sampler2D texture1;       \n"
"uniform sampler2D ditherTex;      \n"
"uniform vec4 constant_color;      \n"
"uniform vec4 ccolor0;             \n"
"uniform vec4 ccolor1;             \n"
"uniform vec4 chroma_color;        \n"
"uniform float lambda;             \n"
"varying vec4 fogValue;            \n"
"                                  \n"
"void test_chroma(vec4 ctexture1); \n"
"                                  \n"
"                                  \n"
"void main()                       \n"
"{                                 \n"
;

// using gl_FragCoord is terribly slow on ATI and varying variables don't work for some unknown
// reason, so we use the unused components of the texture2 coordinates
static const char* fragment_shader_dither =
"  float dithx = (gl_TexCoord[2].b + 1.0)*0.5*1000.0; \n"
"  float dithy = (gl_TexCoord[2].a + 1.0)*0.5*1000.0; \n"
"  if(texture2D(ditherTex, vec2((dithx-32.0*floor(dithx/32.0))/32.0, \n"
"                               (dithy-32.0*floor(dithy/32.0))/32.0)).a > 0.5) discard; \n"
;

static const char* fragment_shader_default =
"  gl_FragColor = texture2D(texture0, vec2(gl_TexCoord[0])); \n"
;

static const char* fragment_shader_depth =
"  gl_FragDepth = dot(texture2D(texture0, vec2(gl_TexCoord[0])), vec4(32*64*32/65536.0, 64*32/65536.0, 32/65536.0, 0))*0.5 + 0.5; \n"
;

static const char* fragment_shader_bw =
"  vec4 readtex0 = texture2D(texture0, vec2(gl_TexCoord[0])); \n"
"  gl_FragColor = vec4(vec3(readtex0.b),                      \n"
"                 readtex0.r + readtex0.g * 8.0 / 256.0);     \n"
;

static const char* fragment_shader_readtex0color =
"  vec4 readtex0 = texture2D(texture0, vec2(gl_TexCoord[0])); \n"
;

static const char* fragment_shader_readtex0bw =
"  vec4 readtex0 = texture2D(texture0, vec2(gl_TexCoord[0])); \n"
"  readtex0 = vec4(vec3(readtex0.b),                          \n"
"                  readtex0.r + readtex0.g * 8.0 / 256.0);    \n"
;
static const char* fragment_shader_readtex0bw_2 =
"  vec4 readtex0 = vec4(dot(texture2D(texture0, vec2(gl_TexCoord[0])), vec4(1.0/3, 1.0/3, 1.0/3, 0)));                        \n"
;

static const char* fragment_shader_readtex1color =
"  vec4 readtex1 = texture2D(texture1, vec2(gl_TexCoord[1])); \n"
;

static const char* fragment_shader_readtex1bw =
"  vec4 readtex1 = texture2D(texture1, vec2(gl_TexCoord[1])); \n"
"  readtex1 = vec4(vec3(readtex1.b),                          \n"
"                  readtex1.r + readtex1.g * 8.0 / 256.0);    \n"
;
static const char* fragment_shader_readtex1bw_2 =
"  vec4 readtex1 = vec4(dot(texture2D(texture1, vec2(gl_TexCoord[1])), vec4(1.0/3, 1.0/3, 1.0/3, 0)));                        \n"
;

static const char* fragment_shader_fog =
"  float fog;                                                                         \n"
"  fog = gl_TexCoord[0].b;                                                            \n"
"  gl_FragColor = vec4(mix(gl_Fog.color.rgb, gl_FragColor.rgb, fog), gl_FragColor.a); \n"
;

static const char* fragment_shader_end =
"}                               \n"
;

static const char* vertex_shader =
"varying vec4 fogValue;                                         \n"
"                                                               \n"
"void main()                                                    \n"
"{                                                              \n"
"  gl_Position = ftransform();                                  \n"
"  gl_FrontColor = gl_Color;                                    \n"
"  gl_TexCoord[0] = gl_MultiTexCoord0;                          \n"
"  gl_TexCoord[1] = gl_MultiTexCoord1;                          \n"
"  float f = (gl_Fog.end - gl_SecondaryColor.r) * gl_Fog.scale; \n" // fog value passed through secondary color (workaround ATI bug)
"  f = clamp(f, 0.0, 1.0);                                      \n"
"  gl_TexCoord[0].b = f;                                        \n" // various data passed through
"  gl_TexCoord[2].b = gl_Vertex.x;                              \n" // texture coordinates
"  gl_TexCoord[2].a = gl_Vertex.y;                              \n" // again it is the only way
"}                                                              \n" // i've found to get it working fast with ATI drivers
;

static char fragment_shader_color_combiner[1024];
static char fragment_shader_alpha_combiner[1024];
static char fragment_shader_texture1[1024];
static char fragment_shader_texture0[1024];
static char fragment_shader_chroma[1024];
static char shader_log[2048];

void updateCombiner(int i)
{
  glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
  glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, fct[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, source0[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, operand0[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, source1[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, operand1[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, source2[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, operand2[i]);

  grDisplayGLError("updateCombiner");
}

void updateCombinera(int i)
{
  glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
  glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, fcta[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, sourcea0[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, operanda0[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA_ARB, sourcea1[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA_ARB, operanda1[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_ALPHA_ARB, sourcea2[i]);
  glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_ALPHA_ARB, operanda2[i]);

  grDisplayGLError("updateCombinera");
}

void init_combiner()
{
  int texture[4] = {0, 0, 0, 0};

  glActiveTextureARB(GL_TEXTURE0_ARB);
  glEnable(GL_TEXTURE_2D);

  // creating a fake texture
  glBindTexture(GL_TEXTURE_2D, default_texture);
  glTexImage2D(GL_TEXTURE_2D, 0, 3, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

  glActiveTextureARB(GL_TEXTURE1_ARB);
  glBindTexture(GL_TEXTURE_2D, default_texture);
  glEnable(GL_TEXTURE_2D);

  int texture0_location;
  int texture1_location;
  char *fragment_shader;
  int log_length;

  // depth shader
  fragment_depth_shader_object = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);

  char s[128];
  // ZIGGY convert a 565 texture into depth component
  sprintf(s, "gl_FragDepth = dot(texture2D(texture0, vec2(gl_TexCoord[0])), vec4(31*64*32, 63*32, 31, 0))*%g + %g; \n", zscale/2/65535.0, 1-zscale/2);
  fragment_shader = (char*)malloc(strlen(fragment_shader_header)+
    strlen(s)+
    strlen(fragment_shader_end)+1);
  strcpy(fragment_shader, fragment_shader_header);
  strcat(fragment_shader, s);
  strcat(fragment_shader, fragment_shader_end);
  glShaderSourceARB(fragment_depth_shader_object, 1, (const GLcharARB**)&fragment_shader, NULL);
  free(fragment_shader);

  glCompileShaderARB(fragment_depth_shader_object);

  // default shader
  fragment_shader_object = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);

  fragment_shader = (char*)malloc(strlen(fragment_shader_header)+
    strlen(fragment_shader_default)+
    strlen(fragment_shader_end)+1);
  strcpy(fragment_shader, fragment_shader_header);
  strcat(fragment_shader, fragment_shader_default);
  strcat(fragment_shader, fragment_shader_end);
  glShaderSourceARB(fragment_shader_object, 1, (const GLcharARB**)&fragment_shader, NULL);
  free(fragment_shader);

  glCompileShaderARB(fragment_shader_object);

  vertex_shader_object = glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
  glShaderSourceARB(vertex_shader_object, 1, &vertex_shader, NULL);
  glCompileShaderARB(vertex_shader_object);

  // depth program
  program_object = glCreateProgramObjectARB();
  program_object_depth = program_object;
  glAttachObjectARB(program_object, fragment_depth_shader_object);
  glAttachObjectARB(program_object, vertex_shader_object);
  glLinkProgramARB(program_object);
  glUseProgramObjectARB(program_object);

  glGetObjectParameterivARB(program_object, GL_OBJECT_LINK_STATUS_ARB , &log_length);
  if(!log_length)
  {
    glGetInfoLogARB(fragment_shader_object, 2048, &log_length, shader_log);
    if(log_length) display_warning(shader_log);
    glGetInfoLogARB(vertex_shader_object, 2048, &log_length, shader_log);
    if(log_length) display_warning(shader_log);
    glGetInfoLogARB(program_object, 2048, &log_length, shader_log);
    if(log_length) display_warning(shader_log);
  }

  texture0_location = glGetUniformLocationARB(program_object, "texture0");
  texture1_location = glGetUniformLocationARB(program_object, "texture1");
  glUniform1iARB(texture0_location, 0);
  glUniform1iARB(texture1_location, 1);

  // default program
  program_object = glCreateProgramObjectARB();
  program_object_default = program_object;
  glAttachObjectARB(program_object, fragment_shader_object);
  glAttachObjectARB(program_object, vertex_shader_object);
  glLinkProgramARB(program_object);
  glUseProgramObjectARB(program_object);

  glGetObjectParameterivARB(program_object, GL_OBJECT_LINK_STATUS_ARB , &log_length);
  if(!log_length)
  {
    glGetInfoLogARB(fragment_shader_object, 2048, &log_length, shader_log);
    if(log_length) display_warning(shader_log);
    glGetInfoLogARB(vertex_shader_object, 2048, &log_length, shader_log);
    if(log_length) display_warning(shader_log);
    glGetInfoLogARB(program_object, 2048, &log_length, shader_log);
    if(log_length) display_warning(shader_log);
  }

  texture0_location = glGetUniformLocationARB(program_object, "texture0");
  texture1_location = glGetUniformLocationARB(program_object, "texture1");
  glUniform1iARB(texture0_location, 0);
  glUniform1iARB(texture1_location, 1);

  strcpy(fragment_shader_color_combiner, "");
  strcpy(fragment_shader_alpha_combiner, "");
  strcpy(fragment_shader_texture1, "vec4 ctexture1 = texture2D(texture0, vec2(gl_TexCoord[0])); \n");
  strcpy(fragment_shader_texture0, "");

  first_color = 1;
  first_alpha = 1;
  first_texture0 = 1;
  first_texture1 = 1;
  need_to_compile = 0;
  fog_enabled = 0;
  chroma_enabled = 0;
  dither_enabled = 0;
  blackandwhite0 = 0;
  blackandwhite1 = 0;

  grDisplayGLError("init_combiner");
}

void compile_chroma_shader()
{
  strcpy(fragment_shader_chroma, "\nvoid test_chroma(vec4 ctexture1)\n{\n");

  switch(chroma_other_alpha)
  {
  case GR_COMBINE_OTHER_ITERATED:
    strcat(fragment_shader_chroma, "float alpha = gl_Color.a; \n");
    break;
  case GR_COMBINE_OTHER_TEXTURE:
    strcat(fragment_shader_chroma, "float alpha = ctexture1.a; \n");
    break;
  case GR_COMBINE_OTHER_CONSTANT:
    strcat(fragment_shader_chroma, "float alpha = constant_color.a; \n");
    break;
  default:
    display_warning("unknown compile_choma_shader_alpha : %x", chroma_other_alpha);
  }

  switch(chroma_other_color)
  {
  case GR_COMBINE_OTHER_ITERATED:
    strcat(fragment_shader_chroma, "vec4 color = vec4(vec3(gl_Color),alpha); \n");
    break;
  case GR_COMBINE_OTHER_TEXTURE:
    strcat(fragment_shader_chroma, "vec4 color = vec4(vec3(ctexture1),alpha); \n");
    break;
  case GR_COMBINE_OTHER_CONSTANT:
    strcat(fragment_shader_chroma, "vec4 color = vec4(vec3(constant_color),alpha); \n");
    break;
  default:
    display_warning("unknown compile_choma_shader_alpha : %x", chroma_other_color);
  }

  strcat(fragment_shader_chroma, "if (color.rgb == chroma_color.rgb) discard; \n");
  strcat(fragment_shader_chroma, "}");

  grDisplayGLError("compile_chroma_shader");
}

typedef struct _shader_program_key
{
  int color_combiner;
  int alpha_combiner;
  int texture0_combiner;
  int texture1_combiner;
  int texture0_combinera;
  int texture1_combinera;
  int fog_enabled;
  int chroma_enabled;
  int dither_enabled;
  int blackandwhite0;
  int blackandwhite1;
  GLhandleARB fragment_shader_object;
  GLhandleARB program_object;
} shader_program_key;

static shader_program_key* shader_programs = NULL;
static int number_of_programs = 0;
static int color_combiner_key;
static int alpha_combiner_key;
static int texture0_combiner_key;
static int texture1_combiner_key;
static int texture0_combinera_key;
static int texture1_combinera_key;

void compile_shader()
{
  int texture0_location;
  int texture1_location;
  int ditherTex_location;
  char *fragment_shader;
  int i;
  int chroma_color_location;
  int log_length;

  need_to_compile = 0;

  for(i=0; i<number_of_programs; i++)
  {
    if(shader_programs[i].color_combiner == color_combiner_key &&
      shader_programs[i].alpha_combiner == alpha_combiner_key &&
      shader_programs[i].texture0_combiner == texture0_combiner_key &&
      shader_programs[i].texture1_combiner == texture1_combiner_key &&
      shader_programs[i].texture0_combinera == texture0_combinera_key &&
      shader_programs[i].texture1_combinera == texture1_combinera_key &&
      shader_programs[i].fog_enabled == fog_enabled &&
      shader_programs[i].chroma_enabled == chroma_enabled &&
      shader_programs[i].dither_enabled == dither_enabled &&
      shader_programs[i].blackandwhite0 == blackandwhite0 &&
      shader_programs[i].blackandwhite1 == blackandwhite1)
    {
      program_object = shader_programs[i].program_object;
      glUseProgramObjectARB(program_object);

      texture0_location = glGetUniformLocationARB(program_object, "texture0");
      texture1_location = glGetUniformLocationARB(program_object, "texture1");
      glUniform1iARB(texture0_location, 0);
      glUniform1iARB(texture1_location, 1);

      constant_color_location = glGetUniformLocationARB(program_object, "constant_color");
      glUniform4fARB(constant_color_location, texture_env_color[0], texture_env_color[1], 
        texture_env_color[2], texture_env_color[3]);

      ccolor0_location = glGetUniformLocationARB(program_object, "ccolor0");
      glUniform4fARB(ccolor0_location, ccolor0[0], ccolor0[1], ccolor0[2], ccolor0[3]);

      ccolor1_location = glGetUniformLocationARB(program_object, "ccolor1");
      glUniform4fARB(ccolor1_location, ccolor1[0], ccolor1[1], ccolor1[2], ccolor1[3]);

      chroma_color_location = glGetUniformLocationARB(program_object, "chroma_color");
      glUniform4fARB(chroma_color_location, chroma_color[0], chroma_color[1],
        chroma_color[2], chroma_color[3]);

      if(dither_enabled)
      {
        ditherTex_location = glGetUniformLocationARB(program_object, "ditherTex");
        glUniform1iARB(ditherTex_location, 2);
      }

      set_lambda();
      return;
    }
  }

  if(shader_programs != NULL)
    shader_programs = (shader_program_key*)realloc(shader_programs, (number_of_programs+1)*sizeof(shader_program_key));
  else
    shader_programs = (shader_program_key*)malloc(sizeof(shader_program_key));
  //printf("number of shaders %d\n", number_of_programs);

  shader_programs[number_of_programs].color_combiner = color_combiner_key;
  shader_programs[number_of_programs].alpha_combiner = alpha_combiner_key;
  shader_programs[number_of_programs].texture0_combiner = texture0_combiner_key;
  shader_programs[number_of_programs].texture1_combiner = texture1_combiner_key;
  shader_programs[number_of_programs].texture0_combinera = texture0_combinera_key;
  shader_programs[number_of_programs].texture1_combinera = texture1_combinera_key;
  shader_programs[number_of_programs].fog_enabled = fog_enabled;
  shader_programs[number_of_programs].chroma_enabled = chroma_enabled;
  shader_programs[number_of_programs].dither_enabled = dither_enabled;
  shader_programs[number_of_programs].blackandwhite0 = blackandwhite0;
  shader_programs[number_of_programs].blackandwhite1 = blackandwhite1;

  if(chroma_enabled)
  {
    strcat(fragment_shader_texture1, "test_chroma(ctexture1); \n");
    compile_chroma_shader();
  }

  fragment_shader = (char*)malloc(4096);

  strcpy(fragment_shader, fragment_shader_header);
  if(dither_enabled) strcat(fragment_shader, fragment_shader_dither);
  switch (blackandwhite0) {
    case 1: strcat(fragment_shader, fragment_shader_readtex0bw); break;
    case 2: strcat(fragment_shader, fragment_shader_readtex0bw_2); break;
    default: strcat(fragment_shader, fragment_shader_readtex0color);
  }
  switch (blackandwhite1) {
    case 1: strcat(fragment_shader, fragment_shader_readtex1bw); break;
    case 2: strcat(fragment_shader, fragment_shader_readtex1bw_2); break;
    default: strcat(fragment_shader, fragment_shader_readtex1color);
  }
  strcat(fragment_shader, fragment_shader_texture0);
  strcat(fragment_shader, fragment_shader_texture1);
  strcat(fragment_shader, fragment_shader_color_combiner);
  strcat(fragment_shader, fragment_shader_alpha_combiner);
  if(fog_enabled) strcat(fragment_shader, fragment_shader_fog);
  strcat(fragment_shader, fragment_shader_end);
  if(chroma_enabled) strcat(fragment_shader, fragment_shader_chroma);

  shader_programs[number_of_programs].fragment_shader_object = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
  glShaderSourceARB(shader_programs[number_of_programs].fragment_shader_object, 1, (const GLcharARB**)&fragment_shader, NULL);
  free(fragment_shader);

  glCompileShaderARB(shader_programs[number_of_programs].fragment_shader_object);

  program_object = glCreateProgramObjectARB();
  shader_programs[number_of_programs].program_object = program_object;
  glAttachObjectARB(program_object, shader_programs[number_of_programs].fragment_shader_object);
  glAttachObjectARB(program_object, vertex_shader_object);
  glLinkProgramARB(program_object);
  glUseProgramObjectARB(program_object);

  glGetObjectParameterivARB(program_object, GL_OBJECT_LINK_STATUS_ARB , &log_length);
  if(!log_length)
  {
    glGetInfoLogARB(shader_programs[number_of_programs].fragment_shader_object, 
      2048, &log_length, shader_log);
    if(log_length) display_warning(shader_log);
    glGetInfoLogARB(vertex_shader_object, 2048, &log_length, shader_log);
    if(log_length) display_warning(shader_log);
    glGetInfoLogARB(program_object, 
      2048, &log_length, shader_log);
    if(log_length) display_warning(shader_log);
  }

  texture0_location = glGetUniformLocationARB(program_object, "texture0");
  texture1_location = glGetUniformLocationARB(program_object, "texture1");
  glUniform1iARB(texture0_location, 0);
  glUniform1iARB(texture1_location, 1);

  constant_color_location = glGetUniformLocationARB(program_object, "constant_color");
  glUniform4fARB(constant_color_location, texture_env_color[0], texture_env_color[1], 
    texture_env_color[2], texture_env_color[3]);

  ccolor0_location = glGetUniformLocationARB(program_object, "ccolor0");
  glUniform4fARB(ccolor0_location, ccolor0[0], ccolor0[1], ccolor0[2], ccolor0[3]);

  ccolor1_location = glGetUniformLocationARB(program_object, "ccolor1");
  glUniform4fARB(ccolor1_location, ccolor1[0], ccolor1[1], ccolor1[2], ccolor1[3]);

  chroma_color_location = glGetUniformLocationARB(program_object, "chroma_color");
  glUniform4fARB(chroma_color_location, chroma_color[0], chroma_color[1],
    chroma_color[2], chroma_color[3]);

  if(dither_enabled)
  {
    ditherTex_location = glGetUniformLocationARB(program_object, "ditherTex");
    glUniform1iARB(ditherTex_location, 2);
  }

  set_lambda();
  number_of_programs++;

  grDisplayGLError("compile_shader");
}

void free_combiners()
{
  free(shader_programs);
  shader_programs = NULL;
  number_of_programs = 0;
}

void set_copy_shader()
{
  int texture0_location;

  glUseProgramObjectARB(program_object_default);
  texture0_location = glGetUniformLocationARB(program_object, "texture0");
  glUniform1iARB(texture0_location, 0);

  grDisplayGLError("set_copy_shader");
}

void set_depth_shader()
{
  int texture0_location;

  glUseProgramObjectARB(program_object_depth);
  texture0_location = glGetUniformLocationARB(program_object, "texture0");
  glUniform1iARB(texture0_location, 0);

  grDisplayGLError("set_depth_shader");
}

void set_lambda()
{
  int lambda_location = glGetUniformLocationARB(program_object, "lambda");
  glUniform1fARB(lambda_location, lambda);

  grDisplayGLError("set_lambda");
}

FX_ENTRY void FX_CALL 
grConstantColorValue( GrColor_t value )
{
  LOG("grConstantColorValue(%d)\r\n", value);
  switch(lfb_color_fmt)
  {
  case GR_COLORFORMAT_ARGB:
    texture_env_color[3] = ((value >> 24) & 0xFF) / 255.0f;
    texture_env_color[0] = ((value >> 16) & 0xFF) / 255.0f;
    texture_env_color[1] = ((value >>  8) & 0xFF) / 255.0f;
    texture_env_color[2] = (value & 0xFF) / 255.0f;
    break;
  case GR_COLORFORMAT_RGBA:
    texture_env_color[0] = ((value >> 24) & 0xFF) / 255.0f;
    texture_env_color[1] = ((value >> 16) & 0xFF) / 255.0f;
    texture_env_color[2] = ((value >>  8) & 0xFF) / 255.0f;
    texture_env_color[3] = (value & 0xFF) / 255.0f;
    break;
  default:
    display_warning("grConstantColorValue: unknown color format : %x", lfb_color_fmt);
  }

  constant_color_location = glGetUniformLocationARB(program_object, "constant_color");
  glUniform4fARB(constant_color_location, texture_env_color[0], texture_env_color[1], 
    texture_env_color[2], texture_env_color[3]);

  grDisplayGLError("grConstantColorValue");
}

int setOtherColorSource(int other)
{
  switch(other)
  {
  case GR_COMBINE_OTHER_ITERATED:
    return GL_PRIMARY_COLOR_ARB;
    break;
  case GR_COMBINE_OTHER_TEXTURE:
    return GL_PREVIOUS_ARB;
    break;
  case GR_COMBINE_OTHER_CONSTANT:
    return GL_CONSTANT_ARB;
    break;
  default:
    display_warning("unknwown other color source : %x", other);
  }
  return 0;
}

int setLocalColorSource(int local)
{
  switch(local)
  {
  case GR_COMBINE_LOCAL_ITERATED:
    return GL_PRIMARY_COLOR_ARB;
    break;
  case GR_COMBINE_LOCAL_CONSTANT:
    return GL_CONSTANT_ARB;
    break;
  default:
    display_warning("unknwown local color source : %x", local);
  }
  return 0;
}

void writeGLSLColorOther(int other)
{
  switch(other)
  {
  case GR_COMBINE_OTHER_ITERATED:
    strcat(fragment_shader_color_combiner, "vec4 color_other = gl_Color; \n");
    break;
  case GR_COMBINE_OTHER_TEXTURE:
    strcat(fragment_shader_color_combiner, "vec4 color_other = ctexture1; \n");
    break;
  case GR_COMBINE_OTHER_CONSTANT:
    strcat(fragment_shader_color_combiner, "vec4 color_other = constant_color; \n");
    break;
  default:
    display_warning("unknown writeGLSLColorOther : %x", other);
  }
}

void writeGLSLColorLocal(int local)
{
  switch(local)
  {
  case GR_COMBINE_LOCAL_ITERATED:
    strcat(fragment_shader_color_combiner, "vec4 color_local = gl_Color; \n");
    break;
  case GR_COMBINE_LOCAL_CONSTANT:
    strcat(fragment_shader_color_combiner, "vec4 color_local = constant_color; \n");
    break;
  default:
    display_warning("unknown writeGLSLColorLocal : %x", local);
  }
}

void writeGLSLColorFactor(int factor, int local, int need_local, int other, int need_other)
{
  switch(factor)
  {
  case GR_COMBINE_FACTOR_ZERO:
    strcat(fragment_shader_color_combiner, "vec4 color_factor = vec4(0.0); \n");
    break;
  case GR_COMBINE_FACTOR_LOCAL:
    if(need_local) writeGLSLColorLocal(local);
    strcat(fragment_shader_color_combiner, "vec4 color_factor = color_local; \n");
    break;
  case GR_COMBINE_FACTOR_OTHER_ALPHA:
    if(need_other) writeGLSLColorOther(other);
    strcat(fragment_shader_color_combiner, "vec4 color_factor = vec4(color_other.a); \n");
    break;
  case GR_COMBINE_FACTOR_LOCAL_ALPHA:
    if(need_local) writeGLSLColorLocal(local);
    strcat(fragment_shader_color_combiner, "vec4 color_factor = vec4(color_local.a); \n");
    break;
  case GR_COMBINE_FACTOR_TEXTURE_ALPHA:
    strcat(fragment_shader_color_combiner, "vec4 color_factor = vec4(ctexture1.a); \n");
    break;
  case GR_COMBINE_FACTOR_TEXTURE_RGB:
    strcat(fragment_shader_color_combiner, "vec4 color_factor = ctexture1; \n");
    break;
  case GR_COMBINE_FACTOR_ONE:
    strcat(fragment_shader_color_combiner, "vec4 color_factor = vec4(1.0); \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_LOCAL:
    if(need_local) writeGLSLColorLocal(local);
    strcat(fragment_shader_color_combiner, "vec4 color_factor = vec4(1.0) - color_local; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_OTHER_ALPHA:
    if(need_other) writeGLSLColorOther(other);
    strcat(fragment_shader_color_combiner, "vec4 color_factor = vec4(1.0) - vec4(color_other.a); \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_LOCAL_ALPHA:
    if(need_local) writeGLSLColorLocal(local);
    strcat(fragment_shader_color_combiner, "vec4 color_factor = vec4(1.0) - vec4(color_local.a); \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_TEXTURE_ALPHA:
    strcat(fragment_shader_color_combiner, "vec4 color_factor = vec4(1.0) - vec4(ctexture1.a); \n");
    break;
  default:
    display_warning("unknown writeGLSLColorFactor : %x", factor);
  }
}

FX_ENTRY void FX_CALL 
grColorCombine(
               GrCombineFunction_t function, GrCombineFactor_t factor,
               GrCombineLocal_t local, GrCombineOther_t other,
               FxBool invert )
{
  LOG("grColorCombine(%d,%d,%d,%d,%d)\r\n", function, factor, local, other, invert);
  static int last_function = 0;
  static int last_factor = 0;
  static int last_local = 0;
  static int last_other = 0;

  if(last_function == function && last_factor == factor &&
    last_local == local && last_other == other && first_color == 0 && !c_combiner_ext) return;
  first_color = 0;
  c_combiner_ext = 0;

  last_function = function;
  last_factor = factor;
  last_local = local;
  last_other = other;

  if (invert) display_warning("grColorCombine : inverted result");

  color_combiner_key = function | (factor << 4) | (local << 8) | (other << 10);
  chroma_other_color = other;

  strcpy(fragment_shader_color_combiner, "");
  switch(function)
  {
  case GR_COMBINE_FUNCTION_ZERO:
    strcat(fragment_shader_color_combiner, "gl_FragColor = vec4(0.0); \n");
    break;
  case GR_COMBINE_FUNCTION_LOCAL:
    writeGLSLColorLocal(local);
    strcat(fragment_shader_color_combiner, "gl_FragColor = color_local; \n");
    break;
  case GR_COMBINE_FUNCTION_LOCAL_ALPHA:
    writeGLSLColorLocal(local);
    strcat(fragment_shader_color_combiner, "gl_FragColor = vec4(color_local.a); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER:
    writeGLSLColorOther(other);
    writeGLSLColorFactor(factor,local,1,other,0);
    strcat(fragment_shader_color_combiner, "gl_FragColor = color_factor * color_other; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL:
    writeGLSLColorLocal(local);
    writeGLSLColorOther(other);
    writeGLSLColorFactor(factor,local,0,other,0);
    strcat(fragment_shader_color_combiner, "gl_FragColor = color_factor * color_other + color_local; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL_ALPHA:
    writeGLSLColorLocal(local);
    writeGLSLColorOther(other);
    writeGLSLColorFactor(factor,local,0,other,0);
    strcat(fragment_shader_color_combiner, "gl_FragColor = color_factor * color_other + vec4(color_local.a); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL:
    writeGLSLColorLocal(local);
    writeGLSLColorOther(other);
    writeGLSLColorFactor(factor,local,0,other,0);
    strcat(fragment_shader_color_combiner, "gl_FragColor = color_factor * (color_other - color_local); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL_ADD_LOCAL:
    writeGLSLColorLocal(local);
    writeGLSLColorOther(other);
    writeGLSLColorFactor(factor,local,0,other,0);
    strcat(fragment_shader_color_combiner, "gl_FragColor = color_factor * (color_other - color_local) + color_local; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL_ADD_LOCAL_ALPHA:
    writeGLSLColorLocal(local);
    writeGLSLColorOther(other);
    writeGLSLColorFactor(factor,local,0,other,0);
    strcat(fragment_shader_color_combiner, "gl_FragColor = color_factor * (color_other - color_local) + vec4(color_local.a); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_MINUS_LOCAL_ADD_LOCAL:
    writeGLSLColorLocal(local);
    writeGLSLColorFactor(factor,local,0,other,1);
    strcat(fragment_shader_color_combiner, "gl_FragColor = color_factor * (-color_local) + color_local; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_MINUS_LOCAL_ADD_LOCAL_ALPHA:
    writeGLSLColorLocal(local);
    writeGLSLColorFactor(factor,local,0,other,1);
    strcat(fragment_shader_color_combiner, "gl_FragColor = color_factor * (-color_local) + vec4(color_local.a); \n");
    break;
  default:
    strcpy(fragment_shader_color_combiner, fragment_shader_default);
    display_warning("grColorCombine : unknown function : %x", function);
  }
  //compile_shader();
  need_to_compile = 1;
}

int setOtherAlphaSource(int other)
{
  switch(other)
  {
  case GR_COMBINE_OTHER_ITERATED:
    return GL_PRIMARY_COLOR_ARB;
    break;
  case GR_COMBINE_OTHER_TEXTURE:
    return GL_PREVIOUS_ARB;
    break;
  case GR_COMBINE_OTHER_CONSTANT:
    return GL_CONSTANT_ARB;
    break;
  default:
    display_warning("unknwown other alpha source : %x", other);
  }
  return 0;
}

int setLocalAlphaSource(int local)
{
  switch(local)
  {
  case GR_COMBINE_LOCAL_ITERATED:
    return GL_PRIMARY_COLOR_ARB;
    break;
  case GR_COMBINE_LOCAL_CONSTANT:
    return GL_CONSTANT_ARB;
    break;
  default:
    display_warning("unknwown local alpha source : %x", local);
  }
  return 0;
}

void writeGLSLAlphaOther(int other)
{
  switch(other)
  {
  case GR_COMBINE_OTHER_ITERATED:
    strcat(fragment_shader_alpha_combiner, "float alpha_other = gl_Color.a; \n");
    break;
  case GR_COMBINE_OTHER_TEXTURE:
    strcat(fragment_shader_alpha_combiner, "float alpha_other = ctexture1.a; \n");
    break;
  case GR_COMBINE_OTHER_CONSTANT:
    strcat(fragment_shader_alpha_combiner, "float alpha_other = constant_color.a; \n");
    break;
  default:
    display_warning("unknown writeGLSLAlphaOther : %x", other);
  }
}

void writeGLSLAlphaLocal(int local)
{
  switch(local)
  {
  case GR_COMBINE_LOCAL_ITERATED:
    strcat(fragment_shader_alpha_combiner, "float alpha_local = gl_Color.a; \n");
    break;
  case GR_COMBINE_LOCAL_CONSTANT:
    strcat(fragment_shader_alpha_combiner, "float alpha_local = constant_color.a; \n");
    break;
  default:
    display_warning("unknown writeGLSLAlphaLocal : %x", local);
  }
}

void writeGLSLAlphaFactor(int factor, int local, int need_local, int other, int need_other)
{
  switch(factor)
  {
  case GR_COMBINE_FACTOR_ZERO:
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = 0.0; \n");
    break;
  case GR_COMBINE_FACTOR_LOCAL:
    if(need_local) writeGLSLAlphaLocal(local);
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = alpha_local; \n");
    break;
  case GR_COMBINE_FACTOR_OTHER_ALPHA:
    if(need_other) writeGLSLAlphaOther(other);
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = alpha_other; \n");
    break;
  case GR_COMBINE_FACTOR_LOCAL_ALPHA:
    if(need_local) writeGLSLAlphaLocal(local);
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = alpha_local; \n");
    break;
  case GR_COMBINE_FACTOR_TEXTURE_ALPHA:
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = ctexture1.a; \n");
    break;
  case GR_COMBINE_FACTOR_ONE:
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = 1.0; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_LOCAL:
    if(need_local) writeGLSLAlphaLocal(local);
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = 1.0 - alpha_local; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_OTHER_ALPHA:
    if(need_other) writeGLSLAlphaOther(other);
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = 1.0 - alpha_other; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_LOCAL_ALPHA:
    if(need_local) writeGLSLAlphaLocal(local);
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = 1.0 - alpha_local; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_TEXTURE_ALPHA:
    strcat(fragment_shader_alpha_combiner, "float alpha_factor = 1.0 - ctexture1.a; \n");
    break;
  default:
    display_warning("unknown writeGLSLAlphaFactor : %x", factor);
  }
}

FX_ENTRY void FX_CALL
grAlphaCombine(
               GrCombineFunction_t function, GrCombineFactor_t factor,
               GrCombineLocal_t local, GrCombineOther_t other,
               FxBool invert
               )
{
  LOG("grAlphaCombine(%d,%d,%d,%d,%d)\r\n", function, factor, local, other, invert);
  static int last_function = 0;
  static int last_factor = 0;
  static int last_local = 0;
  static int last_other = 0;

  if(last_function == function && last_factor == factor &&
    last_local == local && last_other == other && first_alpha == 0 && !a_combiner_ext) return;
  first_alpha = 0;
  a_combiner_ext = 0;

  last_function = function;
  last_factor = factor;
  last_local = local;
  last_other = other;

  if (invert) display_warning("grAlphaCombine : inverted result");

  alpha_combiner_key = function | (factor << 4) | (local << 8) | (other << 10);
  chroma_other_alpha = other;

  strcpy(fragment_shader_alpha_combiner, "");

  switch(function)
  {
  case GR_COMBINE_FUNCTION_ZERO:
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = 0.0; \n");
    break;
  case GR_COMBINE_FUNCTION_LOCAL:
    writeGLSLAlphaLocal(local);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_local; \n");
    break;
  case GR_COMBINE_FUNCTION_LOCAL_ALPHA:
    writeGLSLAlphaLocal(local);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_local; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER:
    writeGLSLAlphaOther(other);
    writeGLSLAlphaFactor(factor,local,1,other,0);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_factor * alpha_other; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL:
    writeGLSLAlphaLocal(local);
    writeGLSLAlphaOther(other);
    writeGLSLAlphaFactor(factor,local,0,other,0);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_factor * alpha_other + alpha_local; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL_ALPHA:
    writeGLSLAlphaLocal(local);
    writeGLSLAlphaOther(other);
    writeGLSLAlphaFactor(factor,local,0,other,0);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_factor * alpha_other + alpha_local; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL:
    writeGLSLAlphaLocal(local);
    writeGLSLAlphaOther(other);
    writeGLSLAlphaFactor(factor,local,0,other,0);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_factor * (alpha_other - alpha_local); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL_ADD_LOCAL:
    writeGLSLAlphaLocal(local);
    writeGLSLAlphaOther(other);
    writeGLSLAlphaFactor(factor,local,0,other,0);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_factor * (alpha_other - alpha_local) + alpha_local; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL_ADD_LOCAL_ALPHA:
    writeGLSLAlphaLocal(local);
    writeGLSLAlphaOther(other);
    writeGLSLAlphaFactor(factor,local,0,other,0);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_factor * (alpha_other - alpha_local) + alpha_local; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_MINUS_LOCAL_ADD_LOCAL:
    writeGLSLAlphaLocal(local);
    writeGLSLAlphaFactor(factor,local,0,other,1);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_factor * (-alpha_local) + alpha_local; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_MINUS_LOCAL_ADD_LOCAL_ALPHA:
    writeGLSLAlphaLocal(local);
    writeGLSLAlphaFactor(factor,local,0,other,1);
    strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = alpha_factor * (-alpha_local) + alpha_local; \n");
    break;
  default:
    display_warning("grAlphaCombine : unknown function : %x", function);
  }

  //compile_shader();
  need_to_compile = 1;
}

void writeGLSLTextureColorFactor(int num_tex, int factor)
{
  switch(factor)
  {
  case GR_COMBINE_FACTOR_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = vec4(0.0); \n");
    break;
  case GR_COMBINE_FACTOR_LOCAL:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = readtex1; \n");
    break;
  case GR_COMBINE_FACTOR_OTHER_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = vec4(ctexture0.a); \n");
    break;
  case GR_COMBINE_FACTOR_LOCAL_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = vec4(readtex1.a); \n");
    break;
  case GR_COMBINE_FACTOR_DETAIL_FACTOR:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = vec4(lambda); \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = vec4(lambda); \n");
    break;
  case GR_COMBINE_FACTOR_ONE:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = vec4(1.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = vec4(1.0); \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_LOCAL:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = vec4(1.0) - readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = vec4(1.0) - readtex1; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_OTHER_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = vec4(1.0) - vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = vec4(1.0) - vec4(ctexture0.a); \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_LOCAL_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = vec4(1.0) - vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = vec4(1.0) - vec4(readtex1.a); \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_DETAIL_FACTOR:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 texture0_color_factor = vec4(1.0) - vec4(lambda); \n");
    else
      strcat(fragment_shader_texture1, "vec4 texture1_color_factor = vec4(1.0) - vec4(lambda); \n");
    break;
  default:
    display_warning("unknown writeGLSLTextureColorFactor : %x", factor);
  }
}

void writeGLSLTextureAlphaFactor(int num_tex, int factor)
{
  switch(factor)
  {
  case GR_COMBINE_FACTOR_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = 0.0; \n");
    break;
  case GR_COMBINE_FACTOR_LOCAL:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = readtex1.a; \n");
    break;
  case GR_COMBINE_FACTOR_OTHER_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = ctexture0.a; \n");
    break;
  case GR_COMBINE_FACTOR_LOCAL_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = readtex1.a; \n");
    break;
  case GR_COMBINE_FACTOR_DETAIL_FACTOR:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = lambda; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = lambda; \n");
    break;
  case GR_COMBINE_FACTOR_ONE:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = 1.0; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = 1.0; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_LOCAL:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = 1.0 - readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = 1.0 - readtex1.a; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_OTHER_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = 1.0 - 0.0; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = 1.0 - ctexture0.a; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_LOCAL_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = 1.0 - readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = 1.0 - readtex1.a; \n");
    break;
  case GR_COMBINE_FACTOR_ONE_MINUS_DETAIL_FACTOR:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "float texture0_alpha_factor = 1.0 - lambda; \n");
    else
      strcat(fragment_shader_texture1, "float texture1_alpha_factor = 1.0 - lambda; \n");
    break;
  default:
    display_warning("unknown writeGLSLTextureAlphaFactor : %x", factor);
  }
}

FX_ENTRY void FX_CALL 
grTexCombine(
             GrChipID_t tmu,
             GrCombineFunction_t rgb_function,
             GrCombineFactor_t rgb_factor, 
             GrCombineFunction_t alpha_function,
             GrCombineFactor_t alpha_factor,
             FxBool rgb_invert,
             FxBool alpha_invert
             )
{
  LOG("grTexCombine(%d,%d,%d,%d,%d,%d,%d)\r\n", tmu, rgb_function, rgb_factor, alpha_function, alpha_factor, rgb_invert, alpha_invert);
  int num_tex;

  if (tmu == GR_TMU0) num_tex = 1;
  else num_tex = 0;

  if(num_tex == 0)
  {
    static int last_function = 0;
    static int last_factor = 0;
    static int last_afunction = 0;
    static int last_afactor = 0;
    static int last_rgb_invert = 0;

    if(last_function == rgb_function && last_factor == rgb_factor &&
      last_afunction == alpha_function && last_afactor == alpha_factor &&
      last_rgb_invert == rgb_invert && first_texture0 == 0 && !tex0_combiner_ext) return;
    first_texture0 = 0;
    tex0_combiner_ext = 0;

    last_function = rgb_function;
    last_factor = rgb_factor;
    last_afunction = alpha_function;
    last_afactor = alpha_factor;
    last_rgb_invert= rgb_invert;
    texture0_combiner_key = rgb_function | (rgb_factor << 4) | 
      (alpha_function << 8) | (alpha_factor << 12) | 
      (rgb_invert << 16);
    texture0_combinera_key = 0;
    strcpy(fragment_shader_texture0, "");
  }
  else
  {
    static int last_function = 0;
    static int last_factor = 0;
    static int last_afunction = 0;
    static int last_afactor = 0;
    static int last_rgb_invert = 0;

    if(last_function == rgb_function && last_factor == rgb_factor &&
      last_afunction == alpha_function && last_afactor == alpha_factor &&
      last_rgb_invert == rgb_invert && first_texture1 == 0 && !tex1_combiner_ext) return;
    first_texture1 = 0;
    tex1_combiner_ext = 0;

    last_function = rgb_function;
    last_factor = rgb_factor;
    last_afunction = alpha_function;
    last_afactor = alpha_factor;
    last_rgb_invert = rgb_invert;

    texture1_combiner_key = rgb_function | (rgb_factor << 4) | 
      (alpha_function << 8) | (alpha_factor << 12) |
      (rgb_invert << 16);
    texture1_combinera_key = 0;
    strcpy(fragment_shader_texture1, "");
  }

  switch(rgb_function)
  {
  case GR_COMBINE_FUNCTION_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = vec4(0.0); \n");
    break;
  case GR_COMBINE_FUNCTION_LOCAL:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = readtex1; \n");
    break;
  case GR_COMBINE_FUNCTION_LOCAL_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = vec4(readtex1.a); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER:
    writeGLSLTextureColorFactor(num_tex, rgb_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = texture0_color_factor * vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = texture1_color_factor * ctexture0; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL:
    writeGLSLTextureColorFactor(num_tex, rgb_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = texture0_color_factor * vec4(0.0) + readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = texture1_color_factor * ctexture0 + readtex1; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL_ALPHA:
    writeGLSLTextureColorFactor(num_tex, rgb_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = texture0_color_factor * vec4(0.0) + vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = texture1_color_factor * ctexture0 + vec4(readtex1.a); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL:
    writeGLSLTextureColorFactor(num_tex, rgb_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = texture0_color_factor * (vec4(0.0) - readtex0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = texture1_color_factor * (ctexture0 - readtex1); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL_ADD_LOCAL:
    writeGLSLTextureColorFactor(num_tex, rgb_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = texture0_color_factor * (vec4(0.0) - readtex0) + readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = texture1_color_factor * (ctexture0 - readtex1) + readtex1; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL_ADD_LOCAL_ALPHA:
    writeGLSLTextureColorFactor(num_tex, rgb_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = texture0_color_factor * (vec4(0.0) - readtex0) + vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = texture1_color_factor * (ctexture0 - readtex1) + vec4(readtex1.a); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_MINUS_LOCAL_ADD_LOCAL:
    writeGLSLTextureColorFactor(num_tex, rgb_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = texture0_color_factor * (-readtex0) + readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = texture1_color_factor * (-readtex1) + readtex1; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_MINUS_LOCAL_ADD_LOCAL_ALPHA:
    writeGLSLTextureColorFactor(num_tex, rgb_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = texture0_color_factor * (-readtex0) + vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = texture1_color_factor * (-readtex1) + vec4(readtex1.a); \n");
    break;
  default:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctexture0 = readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctexture1 = readtex1; \n");
    display_warning("grTextCombine : unknown rgb function : %x", rgb_function);
  }

  if (rgb_invert)
  {
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0 = vec4(1.0) - ctexture0; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1 = vec4(1.0) - ctexture1; \n");
  }

  switch(alpha_function)
  {
  case GR_COMBINE_FACTOR_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = 0.0; \n");
    break;
  case GR_COMBINE_FUNCTION_LOCAL:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = readtex1.a; \n");
    break;
  case GR_COMBINE_FUNCTION_LOCAL_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = readtex1.a; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER:
    writeGLSLTextureAlphaFactor(num_tex, alpha_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = texture0_alpha_factor * 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = texture1_alpha_factor * ctexture0.a; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL:
    writeGLSLTextureAlphaFactor(num_tex, alpha_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = texture0_alpha_factor * 0.0 + readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = texture1_alpha_factor * ctexture0.a + readtex1.a; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_ADD_LOCAL_ALPHA:
    writeGLSLTextureAlphaFactor(num_tex, alpha_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = texture0_alpha_factor * 0.0 + readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = texture1_alpha_factor * ctexture0.a + readtex1.a; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL:
    writeGLSLTextureAlphaFactor(num_tex, alpha_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = texture0_alpha_factor * (0.0 - readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = texture1_alpha_factor * (ctexture0.a - readtex1.a); \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL_ADD_LOCAL:
    writeGLSLTextureAlphaFactor(num_tex, alpha_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = texture0_alpha_factor * (0.0 - readtex0.a) + readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = texture1_alpha_factor * (ctexture0.a - readtex1.a) + readtex1.a; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_OTHER_MINUS_LOCAL_ADD_LOCAL_ALPHA:
    writeGLSLTextureAlphaFactor(num_tex, alpha_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = texture0_alpha_factor * (0.0 - readtex0.a) + readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = texture1_alpha_factor * (ctexture0.a - readtex1.a) + readtex1.a; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_MINUS_LOCAL_ADD_LOCAL:
    writeGLSLTextureAlphaFactor(num_tex, alpha_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = texture0_alpha_factor * (-readtex0.a) + readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = texture1_alpha_factor * (-readtex1.a) + readtex1.a; \n");
    break;
  case GR_COMBINE_FUNCTION_SCALE_MINUS_LOCAL_ADD_LOCAL_ALPHA:
    writeGLSLTextureAlphaFactor(num_tex, alpha_factor);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = texture0_alpha_factor * (-readtex0.a) + readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = texture1_alpha_factor * (-readtex1.a) + readtex1.a; \n");
    break;
  default:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = ctexture0.a; \n");
    display_warning("grTextCombine : unknown alpha function : %x", alpha_function);
  }

  if (alpha_invert)
  {
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctexture0.a = 1.0 - ctexture0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctexture1.a = 1.0 - ctexture1.a; \n");
  }
  need_to_compile = 1;
}

FX_ENTRY void FX_CALL
grAlphaBlendFunction(
                     GrAlphaBlendFnc_t rgb_sf,   GrAlphaBlendFnc_t rgb_df,
                     GrAlphaBlendFnc_t alpha_sf, GrAlphaBlendFnc_t alpha_df
                     )
{
  int sfactorRGB = 0, dfactorRGB = 0, sfactorAlpha = 0, dfactorAlpha = 0;
  LOG("grAlphaBlendFunction(%d,%d,%d,%d)\r\n", rgb_sf, rgb_df, alpha_sf, alpha_df);

  switch(rgb_sf)
  {
  case GR_BLEND_ZERO:
    sfactorRGB = GL_ZERO;
    break;
  case GR_BLEND_SRC_ALPHA:
    sfactorRGB = GL_SRC_ALPHA;
    break;
  case GR_BLEND_ONE:
    sfactorRGB = GL_ONE;
    break;
  case GR_BLEND_ONE_MINUS_SRC_ALPHA:
    sfactorRGB = GL_ONE_MINUS_SRC_ALPHA;
    break;
  default:
    display_warning("grAlphaBlendFunction : rgb_sf = %x", rgb_sf);
  }

  switch(rgb_df)
  {
  case GR_BLEND_ZERO:
    dfactorRGB = GL_ZERO;
    break;
  case GR_BLEND_SRC_ALPHA:
    dfactorRGB = GL_SRC_ALPHA;
    break;
  case GR_BLEND_ONE:
    dfactorRGB = GL_ONE;
    break;
  case GR_BLEND_ONE_MINUS_SRC_ALPHA:
    dfactorRGB = GL_ONE_MINUS_SRC_ALPHA;
    break;
  default:
    display_warning("grAlphaBlendFunction : rgb_df = %x", rgb_df);
  }

  switch(alpha_sf)
  {
  case GR_BLEND_ZERO:
    sfactorAlpha = GL_ZERO;
    break;
  case GR_BLEND_ONE:
    sfactorAlpha = GL_ONE;
    break;
  default:
    display_warning("grAlphaBlendFunction : alpha_sf = %x", alpha_sf);
  }

  switch(alpha_df)
  {
  case GR_BLEND_ZERO:
    dfactorAlpha = GL_ZERO;
    break;
  case GR_BLEND_ONE:
    dfactorAlpha = GL_ONE;
    break;
  default:
    display_warning("grAlphaBlendFunction : alpha_df = %x", alpha_df);
  }
  glEnable(GL_BLEND);
  if (blend_func_separate_support)
    glBlendFuncSeparateEXT(sfactorRGB, dfactorRGB, sfactorAlpha, dfactorAlpha);
  else
    glBlendFunc(sfactorRGB, dfactorRGB);

  grDisplayGLError("grAlphaBlendFunction");
}

FX_ENTRY void FX_CALL
grAlphaTestReferenceValue( GrAlpha_t value )
{
  LOG("grAlphaTestReferenceValue(%d)\r\n", value);
  alpha_ref = value;
  grAlphaTestFunction(alpha_func);
}

FX_ENTRY void FX_CALL
grAlphaTestFunction( GrCmpFnc_t function )
{
  LOG("grAlphaTestFunction(%d)\r\n", function);
  alpha_func = function;
  switch(function)
  {
  case GR_CMP_GREATER:
    glAlphaFunc(GL_GREATER, alpha_ref/255.0f);
    break;
  case GR_CMP_GEQUAL:
    glAlphaFunc(GL_GEQUAL, alpha_ref/255.0f);
    break;
  case GR_CMP_ALWAYS:
    glAlphaFunc(GL_ALWAYS, alpha_ref/255.0f);
    glDisable(GL_ALPHA_TEST);
    grDisplayGLError("grAlphaTestFunction :: GR_CMP_ALWAYS");
    return;
    break;
  default:
    display_warning("grAlphaTestFunction : unknown function : %x", function);
  }

  glEnable(GL_ALPHA_TEST);
  grDisplayGLError("grAlphaTestFunction");
}

// fog

FX_ENTRY void FX_CALL 
grFogMode( GrFogMode_t mode )
{
  LOG("grFogMode(%d)\r\n", mode);
  switch(mode)
  {
  case GR_FOG_DISABLE:
    glDisable(GL_FOG);
    fog_enabled = 0;
    break;
  case GR_FOG_WITH_TABLE_ON_Q:
    glEnable(GL_FOG);
    glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
    fog_enabled = 1;
    break;
  case GR_FOG_WITH_TABLE_ON_FOGCOORD_EXT:
    glEnable(GL_FOG);
    glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
    fog_enabled = 2;
    break;
  default:
    display_warning("grFogMode : unknown mode : %x", mode);
  }
  need_to_compile = 1;

  grDisplayGLError("grFogMode");
}

FX_ENTRY float FX_CALL
guFogTableIndexToW( int i )
{
  LOG("guFogTableIndexToW(%d)\r\n", i);
  return (float)(pow(2.0, 3.0+(double)(i>>2)) / (8-(i&3)));
}

FX_ENTRY void FX_CALL
guFogGenerateLinear(GrFog_t * /*fogtable*/,
                    float nearZ, float farZ )
{
  LOG("guFogGenerateLinear(%f,%f)\r\n", nearZ, farZ);
  glFogi(GL_FOG_MODE, GL_LINEAR);
  glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
  glFogf(GL_FOG_START, nearZ / 255.0f);
  glFogf(GL_FOG_END, farZ / 255.0f);

  grDisplayGLError("guFogGenerateLinear");
}

FX_ENTRY void FX_CALL 
grFogTable( const GrFog_t /*ft */ [] )
{
  LOG("grFogTable()\r\n");
}

FX_ENTRY void FX_CALL 
grFogColorValue( GrColor_t fogcolor )
{
  float color[4];
  LOG("grFogColorValue(%x)\r\n", fogcolor);

  switch(lfb_color_fmt)
  {
  case GR_COLORFORMAT_ARGB:
    color[3] = ((fogcolor >> 24) & 0xFF) / 255.0f;
    color[0] = ((fogcolor >> 16) & 0xFF) / 255.0f;
    color[1] = ((fogcolor >>  8) & 0xFF) / 255.0f;
    color[2] = (fogcolor & 0xFF) / 255.0f;
    break;
  case GR_COLORFORMAT_RGBA:
    color[0] = ((fogcolor >> 24) & 0xFF) / 255.0f;
    color[1] = ((fogcolor >> 16) & 0xFF) / 255.0f;
    color[2] = ((fogcolor >>  8) & 0xFF) / 255.0f;
    color[3] = (fogcolor & 0xFF) / 255.0f;
    break;
  default:
    display_warning("grFogColorValue: unknown color format : %x", lfb_color_fmt);
  }

  glFogfv(GL_FOG_COLOR, color); 
  grDisplayGLError("glFogfv");
}

// chroma

FX_ENTRY void FX_CALL 
grChromakeyMode( GrChromakeyMode_t mode )
{
  LOG("grChromakeyMode(%d)\r\n", mode);
  switch(mode)
  {
  case GR_CHROMAKEY_DISABLE:
    chroma_enabled = 0;
    break;
  case GR_CHROMAKEY_ENABLE:
    chroma_enabled = 1;
    break;
  default:
    display_warning("grChromakeyMode : unknown mode : %x", mode);
  }
  need_to_compile = 1;
}

FX_ENTRY void FX_CALL 
grChromakeyValue( GrColor_t value )
{
  LOG("grChromakeyValue(%x)\r\n", value);
  int chroma_color_location;

  switch(lfb_color_fmt)
  {
  case GR_COLORFORMAT_ARGB:
    chroma_color[3] = 1.0;//((value >> 24) & 0xFF) / 255.0f;
    chroma_color[0] = ((value >> 16) & 0xFF) / 255.0f;
    chroma_color[1] = ((value >>  8) & 0xFF) / 255.0f;
    chroma_color[2] = (value & 0xFF) / 255.0f;
    break;
  case GR_COLORFORMAT_RGBA:
    chroma_color[0] = ((value >> 24) & 0xFF) / 255.0f;
    chroma_color[1] = ((value >> 16) & 0xFF) / 255.0f;
    chroma_color[2] = ((value >>  8) & 0xFF) / 255.0f;
    chroma_color[3] = 1.0;//(value & 0xFF) / 255.0f;
    break;
  default:
    display_warning("grChromakeyValue: unknown color format : %x", lfb_color_fmt);
  }

  chroma_color_location = glGetUniformLocationARB(program_object, "chroma_color");
  glUniform4fARB(chroma_color_location, chroma_color[0], chroma_color[1],
    chroma_color[2], chroma_color[3]);
  grDisplayGLError("grChromakeyValue");
}

static void setPattern()
{
  int i;
  GLubyte stip[32*4];
  for(i=0; i<32; i++)
  {
    unsigned int val = rand() << 17 | (rand() & 1) << 16 | rand() << 1 | rand() & 1;
    stip[i*4+0] = (val >> 24) & 0xFF;
    stip[i*4+1] = (val >> 16) & 0xFF;
    stip[i*4+2] = (val >> 8) & 0xFF;
    stip[i*4+3] = val & 0xFF;
  }
  GLubyte texture[32*32*4];
  for(i=0; i<32; i++)
  {
    int j;
    for(j=0; j<4; j++)
    {
      texture[(i*32+j*8+0)*4+3] = ((stip[i*4+j] >> 7) & 1) ? 255 : 0;
      texture[(i*32+j*8+1)*4+3] = ((stip[i*4+j] >> 6) & 1) ? 255 : 0;
      texture[(i*32+j*8+2)*4+3] = ((stip[i*4+j] >> 5) & 1) ? 255 : 0;
      texture[(i*32+j*8+3)*4+3] = ((stip[i*4+j] >> 4) & 1) ? 255 : 0;
      texture[(i*32+j*8+4)*4+3] = ((stip[i*4+j] >> 3) & 1) ? 255 : 0;
      texture[(i*32+j*8+5)*4+3] = ((stip[i*4+j] >> 2) & 1) ? 255 : 0;
      texture[(i*32+j*8+6)*4+3] = ((stip[i*4+j] >> 1) & 1) ? 255 : 0;
      texture[(i*32+j*8+7)*4+3] = ((stip[i*4+j] >> 0) & 1) ? 255 : 0;
    }
  }
  glActiveTextureARB(GL_TEXTURE2_ARB);
  glEnable(GL_TEXTURE_2D);
  glBindTexture(GL_TEXTURE_2D, 33*1024*1024);
  glTexImage2D(GL_TEXTURE_2D, 0, 4, 32, 32, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glDisable(GL_TEXTURE_2D);

  grDisplayGLError("setPattern");
}

FX_ENTRY void FX_CALL
grStipplePattern(
                 GrStipplePattern_t stipple)
{
  LOG("grStipplePattern(%x)\r\n", stipple);
  srand(stipple);
  setPattern();
}

FX_ENTRY void FX_CALL
grStippleMode( GrStippleMode_t mode )
{
  LOG("grStippleMode(%d)\r\n", mode);
  switch(mode)
  {
  case GR_STIPPLE_DISABLE:
    dither_enabled = 0;
    glActiveTextureARB(GL_TEXTURE2_ARB);
    glDisable(GL_TEXTURE_2D);
    break;
  case GR_STIPPLE_PATTERN:
    setPattern();
    dither_enabled = 1;
    glActiveTextureARB(GL_TEXTURE2_ARB);
    glEnable(GL_TEXTURE_2D);
    break;
  case GR_STIPPLE_ROTATE:
    setPattern();
    dither_enabled = 1;
    glActiveTextureARB(GL_TEXTURE2_ARB);
    glEnable(GL_TEXTURE_2D);
    break;
  default:
    display_warning("grStippleMode:%x", mode);
  }

  need_to_compile = 1;
  grDisplayGLError("grStippleMode");
}

FX_ENTRY void FX_CALL 
grColorCombineExt(GrCCUColor_t a, GrCombineMode_t a_mode,
                  GrCCUColor_t b, GrCombineMode_t b_mode,
                  GrCCUColor_t c, FxBool c_invert,
                  GrCCUColor_t d, FxBool d_invert,
                  FxU32 shift, FxBool invert)
{
  LOG("grColorCombineExt(%d, %d, %d, %d, %d, %d, %d, %d, %d, %d)\r\n", a, a_mode, b, b_mode, c, c_invert, d, d_invert, shift, invert);
  if (invert) display_warning("grColorCombineExt : inverted result");
  if (shift) display_warning("grColorCombineExt : shift = %d", shift);

  color_combiner_key = 0x80000000 | (a & 0x1F) | ((a_mode & 3) << 5) | 
    ((b & 0x1F) << 7) | ((b_mode & 3) << 12) |
    ((c & 0x1F) << 14) | ((c_invert & 1) << 19) |
    ((d & 0x1F) << 20) | ((d_invert & 1) << 25);
  c_combiner_ext = 1;
  strcpy(fragment_shader_color_combiner, "");

  switch(a)
  {
  case GR_CMBX_ZERO:
    strcat(fragment_shader_color_combiner, "vec4 cs_a = vec4(0.0); \n");
    break;
  case GR_CMBX_TEXTURE_ALPHA:
    strcat(fragment_shader_color_combiner, "vec4 cs_a = vec4(ctexture1.a); \n");
    break;
  case GR_CMBX_CONSTANT_ALPHA:
    strcat(fragment_shader_color_combiner, "vec4 cs_a = vec4(constant_color.a); \n");
    break;
  case GR_CMBX_CONSTANT_COLOR:
    strcat(fragment_shader_color_combiner, "vec4 cs_a = constant_color; \n");
    break;
  case GR_CMBX_ITALPHA:
    strcat(fragment_shader_color_combiner, "vec4 cs_a = vec4(gl_Color.a); \n");
    break;
  case GR_CMBX_ITRGB:
    strcat(fragment_shader_color_combiner, "vec4 cs_a = gl_Color; \n");
    break;
  case GR_CMBX_TEXTURE_RGB:
    strcat(fragment_shader_color_combiner, "vec4 cs_a = ctexture1; \n");
    break;
  default:
    display_warning("grColorCombineExt : a = %x", a);
    strcat(fragment_shader_color_combiner, "vec4 cs_a = vec4(0.0); \n");
  }

  switch(a_mode)
  {
  case GR_FUNC_MODE_ZERO:
    strcat(fragment_shader_color_combiner, "vec4 c_a = vec4(0.0); \n");
    break;
  case GR_FUNC_MODE_X:
    strcat(fragment_shader_color_combiner, "vec4 c_a = cs_a; \n");
    break;
  case GR_FUNC_MODE_ONE_MINUS_X:
    strcat(fragment_shader_color_combiner, "vec4 c_a = vec4(1.0) - cs_a; \n");
    break;
  case GR_FUNC_MODE_NEGATIVE_X:
    strcat(fragment_shader_color_combiner, "vec4 c_a = -cs_a; \n");
    break;
  default:
    display_warning("grColorCombineExt : a_mode = %x", a_mode);
    strcat(fragment_shader_color_combiner, "vec4 c_a = vec4(0.0); \n");
  }

  switch(b)
  {
  case GR_CMBX_ZERO:
    strcat(fragment_shader_color_combiner, "vec4 cs_b = vec4(0.0); \n");
    break;
  case GR_CMBX_TEXTURE_ALPHA:
    strcat(fragment_shader_color_combiner, "vec4 cs_b = vec4(ctexture1.a); \n");
    break;
  case GR_CMBX_CONSTANT_ALPHA:
    strcat(fragment_shader_color_combiner, "vec4 cs_b = vec4(constant_color.a); \n");
    break;
  case GR_CMBX_CONSTANT_COLOR:
    strcat(fragment_shader_color_combiner, "vec4 cs_b = constant_color; \n");
    break;
  case GR_CMBX_ITALPHA:
    strcat(fragment_shader_color_combiner, "vec4 cs_b = vec4(gl_Color.a); \n");
    break;
  case GR_CMBX_ITRGB:
    strcat(fragment_shader_color_combiner, "vec4 cs_b = gl_Color; \n");
    break;
  case GR_CMBX_TEXTURE_RGB:
    strcat(fragment_shader_color_combiner, "vec4 cs_b = ctexture1; \n");
    break;
  default:
    display_warning("grColorCombineExt : b = %x", b);
    strcat(fragment_shader_color_combiner, "vec4 cs_b = vec4(0.0); \n");
  }

  switch(b_mode)
  {
  case GR_FUNC_MODE_ZERO:
    strcat(fragment_shader_color_combiner, "vec4 c_b = vec4(0.0); \n");
    break;
  case GR_FUNC_MODE_X:
    strcat(fragment_shader_color_combiner, "vec4 c_b = cs_b; \n");
    break;
  case GR_FUNC_MODE_ONE_MINUS_X:
    strcat(fragment_shader_color_combiner, "vec4 c_b = vec4(1.0) - cs_b; \n");
    break;
  case GR_FUNC_MODE_NEGATIVE_X:
    strcat(fragment_shader_color_combiner, "vec4 c_b = -cs_b; \n");
    break;
  default:
    display_warning("grColorCombineExt : b_mode = %x", b_mode);
    strcat(fragment_shader_color_combiner, "vec4 c_b = vec4(0.0); \n");
  }

  switch(c)
  {
  case GR_CMBX_ZERO:
    strcat(fragment_shader_color_combiner, "vec4 c_c = vec4(0.0); \n");
    break;
  case GR_CMBX_TEXTURE_ALPHA:
    strcat(fragment_shader_color_combiner, "vec4 c_c = vec4(ctexture1.a); \n");
    break;
  case GR_CMBX_ALOCAL:
    strcat(fragment_shader_color_combiner, "vec4 c_c = vec4(c_b.a); \n");
    break;
  case GR_CMBX_AOTHER:
    strcat(fragment_shader_color_combiner, "vec4 c_c = vec4(c_a.a); \n");
    break;
  case GR_CMBX_B:
    strcat(fragment_shader_color_combiner, "vec4 c_c = cs_b; \n");
    break;
  case GR_CMBX_CONSTANT_ALPHA:
    strcat(fragment_shader_color_combiner, "vec4 c_c = vec4(constant_color.a); \n");
    break;
  case GR_CMBX_CONSTANT_COLOR:
    strcat(fragment_shader_color_combiner, "vec4 c_c = constant_color; \n");
    break;
  case GR_CMBX_ITALPHA:
    strcat(fragment_shader_color_combiner, "vec4 c_c = vec4(gl_Color.a); \n");
    break;
  case GR_CMBX_ITRGB:
    strcat(fragment_shader_color_combiner, "vec4 c_c = gl_Color; \n");
    break;
  case GR_CMBX_TEXTURE_RGB:
    strcat(fragment_shader_color_combiner, "vec4 c_c = ctexture1; \n");
    break;
  default:
    display_warning("grColorCombineExt : c = %x", c);
    strcat(fragment_shader_color_combiner, "vec4 c_c = vec4(0.0); \n");
  }

  if(c_invert)
    strcat(fragment_shader_color_combiner, "c_c = vec4(1.0) - c_c; \n");

  switch(d)
  {
  case GR_CMBX_ZERO:
    strcat(fragment_shader_color_combiner, "vec4 c_d = vec4(0.0); \n");
    break;
  case GR_CMBX_ALOCAL:
    strcat(fragment_shader_color_combiner, "vec4 c_d = vec4(c_b.a); \n");
    break;
  case GR_CMBX_B:
    strcat(fragment_shader_color_combiner, "vec4 c_d = cs_b; \n");
    break;
  case GR_CMBX_TEXTURE_RGB:
    strcat(fragment_shader_color_combiner, "vec4 c_d = ctexture1; \n");
    break;
  case GR_CMBX_ITRGB:
    strcat(fragment_shader_color_combiner, "vec4 c_d = gl_Color; \n");
    break;
  default:
    display_warning("grColorCombineExt : d = %x", d);
    strcat(fragment_shader_color_combiner, "vec4 c_d = vec4(0.0); \n");
  }

  if(d_invert)
    strcat(fragment_shader_color_combiner, "c_d = vec4(1.0) - c_d; \n");

  strcat(fragment_shader_color_combiner, "gl_FragColor = (c_a + c_b) * c_c + c_d; \n");

  need_to_compile = 1;
}

FX_ENTRY void FX_CALL
grAlphaCombineExt(GrACUColor_t a, GrCombineMode_t a_mode,
                  GrACUColor_t b, GrCombineMode_t b_mode,
                  GrACUColor_t c, FxBool c_invert,
                  GrACUColor_t d, FxBool d_invert,
                  FxU32 shift, FxBool invert)
{
  LOG("grAlphaCombineExt(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)\r\n", a, a_mode, b, b_mode, c, c_invert, d, d_invert, shift, invert);
  if (invert) display_warning("grAlphaCombineExt : inverted result");
  if (shift) display_warning("grAlphaCombineExt : shift = %d", shift);

  alpha_combiner_key = 0x80000000 | (a & 0x1F) | ((a_mode & 3) << 5) | 
    ((b & 0x1F) << 7) | ((b_mode & 3) << 12) |
    ((c & 0x1F) << 14) | ((c_invert & 1) << 19) |
    ((d & 0x1F) << 20) | ((d_invert & 1) << 25);
  a_combiner_ext = 1;
  strcpy(fragment_shader_alpha_combiner, "");

  switch(a)
  {
  case GR_CMBX_ZERO:
    strcat(fragment_shader_alpha_combiner, "float as_a = 0.0; \n");
    break;
  case GR_CMBX_TEXTURE_ALPHA:
    strcat(fragment_shader_alpha_combiner, "float as_a = ctexture1.a; \n");
    break;
  case GR_CMBX_CONSTANT_ALPHA:
    strcat(fragment_shader_alpha_combiner, "float as_a = constant_color.a; \n");
    break;
  case GR_CMBX_ITALPHA:
    strcat(fragment_shader_alpha_combiner, "float as_a = gl_Color.a; \n");
    break;
  default:
    display_warning("grAlphaCombineExt : a = %x", a);
    strcat(fragment_shader_alpha_combiner, "float as_a = 0.0; \n");
  }

  switch(a_mode)
  {
  case GR_FUNC_MODE_ZERO:
    strcat(fragment_shader_alpha_combiner, "float a_a = 0.0; \n");
    break;
  case GR_FUNC_MODE_X:
    strcat(fragment_shader_alpha_combiner, "float a_a = as_a; \n");
    break;
  case GR_FUNC_MODE_ONE_MINUS_X:
    strcat(fragment_shader_alpha_combiner, "float a_a = 1.0 - as_a; \n");
    break;
  case GR_FUNC_MODE_NEGATIVE_X:
    strcat(fragment_shader_alpha_combiner, "float a_a = -as_a; \n");
    break;
  default:
    display_warning("grAlphaCombineExt : a_mode = %x", a_mode);
    strcat(fragment_shader_alpha_combiner, "float a_a = 0.0; \n");
  }

  switch(b)
  {
  case GR_CMBX_ZERO:
    strcat(fragment_shader_alpha_combiner, "float as_b = 0.0; \n");
    break;
  case GR_CMBX_TEXTURE_ALPHA:
    strcat(fragment_shader_alpha_combiner, "float as_b = ctexture1.a; \n");
    break;
  case GR_CMBX_CONSTANT_ALPHA:
    strcat(fragment_shader_alpha_combiner, "float as_b = constant_color.a; \n");
    break;
  case GR_CMBX_ITALPHA:
    strcat(fragment_shader_alpha_combiner, "float as_b = gl_Color.a; \n");
    break;
  default:
    display_warning("grAlphaCombineExt : b = %x", b);
    strcat(fragment_shader_alpha_combiner, "float as_b = 0.0; \n");
  }

  switch(b_mode)
  {
  case GR_FUNC_MODE_ZERO:
    strcat(fragment_shader_alpha_combiner, "float a_b = 0.0; \n");
    break;
  case GR_FUNC_MODE_X:
    strcat(fragment_shader_alpha_combiner, "float a_b = as_b; \n");
    break;
  case GR_FUNC_MODE_ONE_MINUS_X:
    strcat(fragment_shader_alpha_combiner, "float a_b = 1.0 - as_b; \n");
    break;
  case GR_FUNC_MODE_NEGATIVE_X:
    strcat(fragment_shader_alpha_combiner, "float a_b = -as_b; \n");
    break;
  default:
    display_warning("grAlphaCombineExt : b_mode = %x", b_mode);
    strcat(fragment_shader_alpha_combiner, "float a_b = 0.0; \n");
  }

  switch(c)
  {
  case GR_CMBX_ZERO:
    strcat(fragment_shader_alpha_combiner, "float a_c = 0.0; \n");
    break;
  case GR_CMBX_TEXTURE_ALPHA:
    strcat(fragment_shader_alpha_combiner, "float a_c = ctexture1.a; \n");
    break;
  case GR_CMBX_ALOCAL:
    strcat(fragment_shader_alpha_combiner, "float a_c = as_b; \n");
    break;
  case GR_CMBX_AOTHER:
    strcat(fragment_shader_alpha_combiner, "float a_c = as_a; \n");
    break;
  case GR_CMBX_B:
    strcat(fragment_shader_alpha_combiner, "float a_c = as_b; \n");
    break;
  case GR_CMBX_CONSTANT_ALPHA:
    strcat(fragment_shader_alpha_combiner, "float a_c = constant_color.a; \n");
    break;
  case GR_CMBX_ITALPHA:
    strcat(fragment_shader_alpha_combiner, "float a_c = gl_Color.a; \n");
    break;
  default:
    display_warning("grAlphaCombineExt : c = %x", c);
    strcat(fragment_shader_alpha_combiner, "float a_c = 0.0; \n");
  }

  if(c_invert)
    strcat(fragment_shader_alpha_combiner, "a_c = 1.0 - a_c; \n");

  switch(d)
  {
  case GR_CMBX_ZERO:
    strcat(fragment_shader_alpha_combiner, "float a_d = 0.0; \n");
    break;
  case GR_CMBX_TEXTURE_ALPHA:
    strcat(fragment_shader_alpha_combiner, "float a_d = ctexture1.a; \n");
    break;
  case GR_CMBX_ALOCAL:
    strcat(fragment_shader_alpha_combiner, "float a_d = as_b; \n");
    break;
  case GR_CMBX_B:
    strcat(fragment_shader_alpha_combiner, "float a_d = as_b; \n");
    break;
  default:
    display_warning("grAlphaCombineExt : d = %x", d);
    strcat(fragment_shader_alpha_combiner, "float a_d = 0.0; \n");
  }

  if(d_invert)
    strcat(fragment_shader_alpha_combiner, "a_d = 1.0 - a_d; \n");

  strcat(fragment_shader_alpha_combiner, "gl_FragColor.a = (a_a + a_b) * a_c + a_d; \n");

  need_to_compile = 1;
}

FX_ENTRY void FX_CALL 
grTexColorCombineExt(GrChipID_t       tmu,
                     GrTCCUColor_t a, GrCombineMode_t a_mode,
                     GrTCCUColor_t b, GrCombineMode_t b_mode,
                     GrTCCUColor_t c, FxBool c_invert,
                     GrTCCUColor_t d, FxBool d_invert,
                     FxU32 shift, FxBool invert)
{
  int num_tex;
  LOG("grTexColorCombineExt(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)\r\n", tmu, a, a_mode, b, b_mode, c, c_invert, d, d_invert, shift, invert);

  if (invert) display_warning("grTexColorCombineExt : inverted result");
  if (shift) display_warning("grTexColorCombineExt : shift = %d", shift);

  if (tmu == GR_TMU0) num_tex = 1;
  else num_tex = 0;

  if(num_tex == 0)
  {
    texture0_combiner_key = 0x80000000 | (a & 0x1F) | ((a_mode & 3) << 5) | 
      ((b & 0x1F) << 7) | ((b_mode & 3) << 12) |
      ((c & 0x1F) << 14) | ((c_invert & 1) << 19) |
      ((d & 0x1F) << 20) | ((d_invert & 1) << 25);
    tex0_combiner_ext = 1;
    strcpy(fragment_shader_texture0, "");
  }
  else
  {
    texture1_combiner_key = 0x80000000 | (a & 0x1F) | ((a_mode & 3) << 5) | 
      ((b & 0x1F) << 7) | ((b_mode & 3) << 12) |
      ((c & 0x1F) << 14) | ((c_invert & 1) << 19) |
      ((d & 0x1F) << 20) | ((d_invert & 1) << 25);
    tex1_combiner_ext = 1;
    strcpy(fragment_shader_texture1, "");
  }

  switch(a)
  {
  case GR_CMBX_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = vec4(0.0); \n");
    break;
  case GR_CMBX_ITALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = vec4(gl_Color.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = vec4(gl_Color.a); \n");
    break;
  case GR_CMBX_ITRGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = gl_Color; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = gl_Color; \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = vec4(readtex1.a); \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_RGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = readtex1; \n");
    break;
  case GR_CMBX_OTHER_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = vec4(ctexture0.a); \n");
    break;
  case GR_CMBX_OTHER_TEXTURE_RGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = ctexture0; \n");
    break;
  case GR_CMBX_TMU_CCOLOR:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = ccolor0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = ccolor1; \n");
    break;
  case GR_CMBX_TMU_CALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = vec4(ccolor0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = vec4(ccolor1.a); \n");
    break;
  default:
    display_warning("grTexColorCombineExt : a = %x", a);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_a = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_a = vec4(0.0); \n");
  }

  switch(a_mode)
  {
  case GR_FUNC_MODE_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_a = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_a = vec4(0.0); \n");
    break;
  case GR_FUNC_MODE_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_a = ctex0s_a; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_a = ctex1s_a; \n");
    break;
  case GR_FUNC_MODE_ONE_MINUS_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_a = vec4(1.0) - ctex0s_a; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_a = vec4(1.0) - ctex1s_a; \n");
    break;
  case GR_FUNC_MODE_NEGATIVE_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_a = -ctex0s_a; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_a = -ctex1s_a; \n");
    break;
  default:
    display_warning("grTexColorCombineExt : a_mode = %x", a_mode);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_a = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_a = vec4(0.0); \n");
  }

  switch(b)
  {
  case GR_CMBX_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = vec4(0.0); \n");
    break;
  case GR_CMBX_ITALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = vec4(gl_Color.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = vec4(gl_Color.a); \n");
    break;
  case GR_CMBX_ITRGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = gl_Color; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = gl_Color; \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = vec4(readtex1.a); \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_RGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = readtex1; \n");
    break;
  case GR_CMBX_OTHER_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = vec4(ctexture0.a); \n");
    break;
  case GR_CMBX_OTHER_TEXTURE_RGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = ctexture0; \n");
    break;
  case GR_CMBX_TMU_CALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = vec4(ccolor0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = vec4(ccolor1.a); \n");
    break;
  case GR_CMBX_TMU_CCOLOR:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = ccolor0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = ccolor1; \n");
    break;
  default:
    display_warning("grTexColorCombineExt : b = %x", b);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0s_b = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1s_b = vec4(0.0); \n");
  }

  switch(b_mode)
  {
  case GR_FUNC_MODE_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_b = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_b = vec4(0.0); \n");
    break;
  case GR_FUNC_MODE_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_b = ctex0s_b; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_b = ctex1s_b; \n");
    break;
  case GR_FUNC_MODE_ONE_MINUS_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_b = vec4(1.0) - ctex0s_b; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_b = vec4(1.0) - ctex1s_b; \n");
    break;
  case GR_FUNC_MODE_NEGATIVE_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_b = -ctex0s_b; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_b = -ctex1s_b; \n");
    break;
  default:
    display_warning("grTexColorCombineExt : b_mode = %x", b_mode);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_b = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_b = vec4(0.0); \n");
  }

  switch(c)
  {
  case GR_CMBX_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = vec4(0.0); \n");
    break;
  case GR_CMBX_B:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = ctex0s_b; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = ctex1s_b; \n");
    break;
  case GR_CMBX_DETAIL_FACTOR:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = vec4(lambda); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = vec4(lambda); \n");
    break;
  case GR_CMBX_ITRGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = gl_Color; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = gl_Color; \n");
    break;
  case GR_CMBX_ITALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = vec4(gl_Color.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = vec4(gl_Color.a); \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = vec4(readtex1.a); \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_RGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = readtex0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = readtex1; \n");
    break;
  case GR_CMBX_OTHER_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = vec4(ctexture0.a); \n");
    break;
  case GR_CMBX_OTHER_TEXTURE_RGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = ctexture0; \n");
    break;
  case GR_CMBX_TMU_CALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = vec4(ccolor0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = vec4(ccolor1.a); \n");
    break;
  case GR_CMBX_TMU_CCOLOR:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = ccolor0; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = ccolor1; \n");
    break;
  default:
    display_warning("grTexColorCombineExt : c = %x", c);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_c = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_c = vec4(0.0); \n");
  }

  if(c_invert)
  {
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c = vec4(1.0) - ctex0_c; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c = vec4(1.0) - ctex1_c; \n");
  }

  switch(d)
  {
  case GR_CMBX_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_d = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_d = vec4(0.0); \n");
    break;
  case GR_CMBX_B:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_d = ctex0s_b; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_d = ctex1s_b; \n");
    break;
  case GR_CMBX_ITRGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_d = gl_Color; \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_d = gl_Color; \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_d = vec4(readtex0.a); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_d = vec4(readtex1.a); \n");
    break;
  default:
    display_warning("grTexColorCombineExt : d = %x", d);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "vec4 ctex0_d = vec4(0.0); \n");
    else
      strcat(fragment_shader_texture1, "vec4 ctex1_d = vec4(0.0); \n");
  }

  if(d_invert)
  {
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_d = vec4(1.0) - ctex0_d; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_d = vec4(1.0) - ctex1_d; \n");
  }

  if(num_tex == 0)
    strcat(fragment_shader_texture0, "vec4 ctexture0 = (ctex0_a + ctex0_b) * ctex0_c + ctex0_d; \n");
  else
    strcat(fragment_shader_texture1, "vec4 ctexture1 = (ctex1_a + ctex1_b) * ctex1_c + ctex1_d; \n");
  need_to_compile = 1;
}

FX_ENTRY void FX_CALL 
grTexAlphaCombineExt(GrChipID_t       tmu,
                     GrTACUColor_t a, GrCombineMode_t a_mode,
                     GrTACUColor_t b, GrCombineMode_t b_mode,
                     GrTACUColor_t c, FxBool c_invert,
                     GrTACUColor_t d, FxBool d_invert,
                     FxU32 shift, FxBool invert)
{
  int num_tex;
  LOG("grTexAlphaCombineExt(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)\r\n", tmu, a, a_mode, b, b_mode, c, c_invert, d, d_invert, shift, invert);

  if (invert) display_warning("grTexAlphaCombineExt : inverted result");
  if (shift) display_warning("grTexAlphaCombineExt : shift = %d", shift);

  if (tmu == GR_TMU0) num_tex = 1;
  else num_tex = 0;

  if(num_tex == 0)
  {
    texture0_combinera_key = 0x80000000 | (a & 0x1F) | ((a_mode & 3) << 5) | 
      ((b & 0x1F) << 7) | ((b_mode & 3) << 12) |
      ((c & 0x1F) << 14) | ((c_invert & 1) << 19) |
      ((d & 0x1F) << 20) | ((d_invert & 1) << 25);
  }
  else
  {
    texture1_combinera_key = 0x80000000 | (a & 0x1F) | ((a_mode & 3) << 5) | 
      ((b & 0x1F) << 7) | ((b_mode & 3) << 12) |
      ((c & 0x1F) << 14) | ((c_invert & 1) << 19) |
      ((d & 0x1F) << 20) | ((d_invert & 1) << 25);
  }

  switch(a)
  {
  case GR_CMBX_ITALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_a.a = gl_Color.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_a.a = gl_Color.a; \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_a.a = readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_a.a = readtex1.a; \n");
    break;
  case GR_CMBX_OTHER_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_a.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_a.a = ctexture0.a; \n");
    break;
  case GR_CMBX_TMU_CALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_a.a = ccolor0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_a.a = ccolor1.a; \n");
    break;
  default:
    display_warning("grTexAlphaCombineExt : a = %x", a);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_a.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_a.a = 0.0; \n");
  }

  switch(a_mode)
  {
  case GR_FUNC_MODE_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_a.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_a.a = 0.0; \n");
    break;
  case GR_FUNC_MODE_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_a.a = ctex0s_a.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_a.a = ctex1s_a.a; \n");
    break;
  case GR_FUNC_MODE_ONE_MINUS_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_a.a = 1.0 - ctex0s_a.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_a.a = 1.0 - ctex1s_a.a; \n");
    break;
  case GR_FUNC_MODE_NEGATIVE_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_a.a = -ctex0s_a.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_a.a = -ctex1s_a.a; \n");
    break;
  default:
    display_warning("grTexAlphaCombineExt : a_mode = %x", a_mode);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_a.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_a.a = 0.0; \n");
  }

  switch(b)
  {
  case GR_CMBX_ITALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_b.a = gl_Color.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_b.a = gl_Color.a; \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_b.a = readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_b.a = readtex1.a; \n");
    break;
  case GR_CMBX_OTHER_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_b.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_b.a = ctexture0.a; \n");
    break;
  case GR_CMBX_TMU_CALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_b.a = ccolor0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_b.a = ccolor1.a; \n");
    break;
  default:
    display_warning("grTexAlphaCombineExt : b = %x", b);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0s_b.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1s_b.a = 0.0; \n");
  }

  switch(b_mode)
  {
  case GR_FUNC_MODE_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_b.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_b.a = 0.0; \n");
    break;
  case GR_FUNC_MODE_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_b.a = ctex0s_b.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_b.a = ctex1s_b.a; \n");
    break;
  case GR_FUNC_MODE_ONE_MINUS_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_b.a = 1.0 - ctex0s_b.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_b.a = 1.0 - ctex1s_b.a; \n");
    break;
  case GR_FUNC_MODE_NEGATIVE_X:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_b.a = -ctex0s_b.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_b.a = -ctex1s_b.a; \n");
    break;
  default:
    display_warning("grTexAlphaCombineExt : b_mode = %x", b_mode);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_b.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_b.a = 0.0; \n");
  }

  switch(c)
  {
  case GR_CMBX_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c.a = 0.0; \n");
    break;
  case GR_CMBX_B:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c.a = ctex0s_b.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c.a = ctex1s_b.a; \n");
    break;
  case GR_CMBX_DETAIL_FACTOR:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c.a = lambda; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c.a = lambda; \n");
    break;
  case GR_CMBX_ITALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c.a = gl_Color.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c.a = gl_Color.a; \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c.a = readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c.a = readtex1.a; \n");
    break;
  case GR_CMBX_OTHER_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c.a = ctexture0.a; \n");
    break;
  case GR_CMBX_TMU_CALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c.a = ccolor0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c.a = ccolor1.a; \n");
    break;
  default:
    display_warning("grTexAlphaCombineExt : c = %x", c);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c.a = 0.0; \n");
  }

  if(c_invert)
  {
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_c.a = 1.0 - ctex0_c.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_c.a = 1.0 - ctex1_c.a; \n");
  }

  switch(d)
  {
  case GR_CMBX_ZERO:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_d.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_d.a = 0.0; \n");
    break;
  case GR_CMBX_B:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_d.a = ctex0s_b.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_d.a = ctex1s_b.a; \n");
    break;
  case GR_CMBX_ITALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_d.a = gl_Color.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_d.a = gl_Color.a; \n");
    break;
  case GR_CMBX_ITRGB:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_d.a = gl_Color.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_d.a = gl_Color.a; \n");
    break;
  case GR_CMBX_LOCAL_TEXTURE_ALPHA:
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_d.a = readtex0.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_d.a = readtex1.a; \n");
    break;
  default:
    display_warning("grTexAlphaCombineExt : d = %x", d);
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_d.a = 0.0; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_d.a = 0.0; \n");
  }

  if(d_invert)
  {
    if(num_tex == 0)
      strcat(fragment_shader_texture0, "ctex0_d.a = 1.0 - ctex0_d.a; \n");
    else
      strcat(fragment_shader_texture1, "ctex1_d.a = 1.0 - ctex1_d.a; \n");
  }

  if(num_tex == 0)
    strcat(fragment_shader_texture0, "ctexture0.a = (ctex0_a.a + ctex0_b.a) * ctex0_c.a + ctex0_d.a; \n");
  else
    strcat(fragment_shader_texture1, "ctexture1.a = (ctex1_a.a + ctex1_b.a) * ctex1_c.a + ctex1_d.a; \n");

  need_to_compile = 1;
}

FX_ENTRY void FX_CALL
grConstantColorValueExt(GrChipID_t    tmu,
                        GrColor_t     value)
{
  int num_tex;
  LOG("grConstantColorValueExt(%d,%d)\r\n", tmu, value);

  if (tmu == GR_TMU0) num_tex = 1;
  else num_tex = 0;

  switch(lfb_color_fmt)
  {
  case GR_COLORFORMAT_ARGB:
    if(num_tex == 0)
    {
      ccolor0[3] = ((value >> 24) & 0xFF) / 255.0f;
      ccolor0[0] = ((value >> 16) & 0xFF) / 255.0f;
      ccolor0[1] = ((value >>  8) & 0xFF) / 255.0f;
      ccolor0[2] = (value & 0xFF) / 255.0f;
    }
    else
    {
      ccolor1[3] = ((value >> 24) & 0xFF) / 255.0f;
      ccolor1[0] = ((value >> 16) & 0xFF) / 255.0f;
      ccolor1[1] = ((value >>  8) & 0xFF) / 255.0f;
      ccolor1[2] = (value & 0xFF) / 255.0f;
    }
    break;
  case GR_COLORFORMAT_RGBA:
    if(num_tex == 0)
    {
      ccolor0[0] = ((value >> 24) & 0xFF) / 255.0f;
      ccolor0[1] = ((value >> 16) & 0xFF) / 255.0f;
      ccolor0[2] = ((value >>  8) & 0xFF) / 255.0f;
      ccolor0[3] = (value & 0xFF) / 255.0f;
    }
    else
    {
      ccolor1[0] = ((value >> 24) & 0xFF) / 255.0f;
      ccolor1[1] = ((value >> 16) & 0xFF) / 255.0f;
      ccolor1[2] = ((value >>  8) & 0xFF) / 255.0f;
      ccolor1[3] = (value & 0xFF) / 255.0f;
    }
    break;
  default:
    display_warning("grConstantColorValue: unknown color format : %x", lfb_color_fmt);
  }

  if(num_tex == 0)
  {
    ccolor0_location = glGetUniformLocationARB(program_object, "ccolor0");
    glUniform4fARB(ccolor0_location, ccolor0[0], ccolor0[1], ccolor0[2], ccolor0[3]);
  }
  else
  {
    ccolor1_location = glGetUniformLocationARB(program_object, "ccolor1");
    glUniform4fARB(ccolor1_location, ccolor1[0], ccolor1[1], ccolor1[2], ccolor1[3]);
  }
  grDisplayGLError("grConstantColorValueExt");
}