flycast/core/rend/gles/gles.cpp

#include <cmath>
#include "glcache.h"
#include "gles.h"
#include "rend/TexCache.h"
#include "rend/gui.h"
#include "wsi/gl_context.h"
#include "cfg/cfg.h"
#include "rend/osd.h"

#ifdef GLES
#ifndef GL_RED
#define GL_RED                            0x1903
#endif
#ifndef GL_MAJOR_VERSION
#define GL_MAJOR_VERSION                  0x821B
#endif
#endif
#include <png.h>

#include "oslib/oslib.h"
#include "rend/rend.h"
#include "input/gamepad.h"

float fb_scale_x,fb_scale_y;
float scale_x, scale_y;

//Fragment and vertex shaders code
const char* VertexShaderSource =
"\
%s \n\
#define TARGET_GL %s \n\
#define pp_Gouraud %d \n\
#define ROTATE_90 %d \n\
 \n\
#define GLES2 0 \n\
#define GLES3 1 \n\
#define GL2 2 \n\
#define GL3 3 \n\
 \n\
#if TARGET_GL == GL2 \n\
#define highp \n\
#define lowp \n\
#define mediump \n\
#endif \n\
#if TARGET_GL == GLES2 || TARGET_GL == GL2 \n\
#define in attribute \n\
#define out varying \n\
#endif \n\
 \n\
 \n\
#if TARGET_GL == GL3 || TARGET_GL == GLES3 \n\
#if pp_Gouraud == 0 \n\
#define INTERPOLATION flat \n\
#else \n\
#define INTERPOLATION smooth \n\
#endif \n\
#else \n\
#define INTERPOLATION \n\
#endif \n\
 \n\
/* Vertex constants*/  \n\
uniform highp vec4      scale; \n\
uniform highp vec4      depth_scale; \n\
uniform highp float     extra_depth_scale; \n\
/* Vertex input */ \n\
in highp vec4    in_pos; \n\
in lowp vec4     in_base; \n\
in lowp vec4     in_offs; \n\
in mediump vec2  in_uv; \n\
/* output */ \n\
INTERPOLATION out lowp vec4 vtx_base; \n\
INTERPOLATION out lowp vec4 vtx_offs; \n\
              out mediump vec2 vtx_uv; \n\
void main() \n\
{ \n\
	vtx_base=in_base; \n\
	vtx_offs=in_offs; \n\
	vtx_uv=in_uv; \n\
	highp vec4 vpos = in_pos; \n\
	if (vpos.z < 0.0 || vpos.z > 3.4e37) \n\
	{ \n\
		gl_Position = vec4(0.0, 0.0, 1.0, 1.0 / vpos.z); \n\
		return; \n\
	} \n\
	\n\
	vpos.w = extra_depth_scale / vpos.z; \n\
#if TARGET_GL != GLES2 \n\
	vpos.z = vpos.w; \n\
#else \n\
	vpos.z=depth_scale.x+depth_scale.y*vpos.w;  \n\
#endif \n\
#if ROTATE_90 == 1 \n\
	vpos.xy = vec2(vpos.y, -vpos.x);  \n\
#endif \n\
	vpos.xy=vpos.xy*scale.xy-scale.zw;  \n\
	vpos.xy*=vpos.w;  \n\
	gl_Position = vpos; \n\
}";

const char* PixelPipelineShader =
"\
%s \n\
#define TARGET_GL %s \n\
\n\
#define cp_AlphaTest %d \n\
#define pp_ClipTestMode %d \n\
#define pp_UseAlpha %d \n\
#define pp_Texture %d \n\
#define pp_IgnoreTexA %d \n\
#define pp_ShadInstr %d \n\
#define pp_Offset %d \n\
#define pp_FogCtrl %d \n\
#define pp_Gouraud %d \n\
#define pp_BumpMap %d \n\
#define FogClamping %d \n\
#define pp_TriLinear %d \n\
#define PI 3.1415926 \n\
\n\
#define GLES2 0 \n\
#define GLES3 1 \n\
#define GL2 2 \n\
#define GL3 3 \n\
 \n\
#if TARGET_GL == GL2 \n\
#define highp \n\
#define lowp \n\
#define mediump \n\
#endif \n\
#if TARGET_GL == GLES3 \n\
out highp vec4 FragColor; \n\
#define gl_FragColor FragColor \n\
#define FOG_CHANNEL a \n\
#elif TARGET_GL == GL3 \n\
out highp vec4 FragColor; \n\
#define gl_FragColor FragColor \n\
#define FOG_CHANNEL r \n\
#else \n\
#define in varying \n\
#define texture texture2D \n\
#define FOG_CHANNEL a \n\
#endif \n\
 \n\
 \n\
#if TARGET_GL == GL3 || TARGET_GL == GLES3 \n\
#if pp_Gouraud == 0 \n\
#define INTERPOLATION flat \n\
#else \n\
#define INTERPOLATION smooth \n\
#endif \n\
#else \n\
#define INTERPOLATION \n\
#endif \n\
 \n\
/* Shader program params*/ \n\
/* gles has no alpha test stage, so its emulated on the shader */ \n\
uniform lowp float cp_AlphaTestValue; \n\
uniform lowp vec4 pp_ClipTest; \n\
uniform lowp vec3 sp_FOG_COL_RAM,sp_FOG_COL_VERT; \n\
uniform highp float sp_FOG_DENSITY; \n\
uniform sampler2D tex,fog_table; \n\
uniform lowp float trilinear_alpha; \n\
uniform lowp vec4 fog_clamp_min; \n\
uniform lowp vec4 fog_clamp_max; \n\
uniform highp float extra_depth_scale; \n\
/* Vertex input*/ \n\
INTERPOLATION in lowp vec4 vtx_base; \n\
INTERPOLATION in lowp vec4 vtx_offs; \n\
			  in mediump vec2 vtx_uv; \n\
 \n\
lowp float fog_mode2(highp float w) \n\
{ \n\
	highp float z = clamp(w * extra_depth_scale * sp_FOG_DENSITY, 1.0, 255.9999); \n\
	highp float exp = floor(log2(z)); \n\
	highp float m = z * 16.0 / pow(2.0, exp) - 16.0; \n\
	lowp float idx = floor(m) + exp * 16.0 + 0.5; \n\
	highp vec4 fog_coef = texture(fog_table, vec2(idx / 128.0, 0.75 - (m - floor(m)) / 2.0)); \n\
	return fog_coef.FOG_CHANNEL; \n\
} \n\
 \n\
highp vec4 fog_clamp(lowp vec4 col) \n\
{ \n\
#if FogClamping == 1 \n\
	return clamp(col, fog_clamp_min, fog_clamp_max); \n\
#else \n\
	return col; \n\
#endif \n\
} \n\
 \n\
void main() \n\
{ \n\
	// Clip outside the box \n\
	#if pp_ClipTestMode==1 \n\
		if (gl_FragCoord.x < pp_ClipTest.x || gl_FragCoord.x > pp_ClipTest.z \n\
				|| gl_FragCoord.y < pp_ClipTest.y || gl_FragCoord.y > pp_ClipTest.w) \n\
			discard; \n\
	#endif \n\
	// Clip inside the box \n\
	#if pp_ClipTestMode==-1 \n\
		if (gl_FragCoord.x >= pp_ClipTest.x && gl_FragCoord.x <= pp_ClipTest.z \n\
				&& gl_FragCoord.y >= pp_ClipTest.y && gl_FragCoord.y <= pp_ClipTest.w) \n\
			discard; \n\
	#endif \n\
	\n\
	lowp vec4 color=vtx_base; \n\
	#if pp_UseAlpha==0 \n\
		color.a=1.0; \n\
	#endif\n\
	#if pp_FogCtrl==3 \n\
		color=vec4(sp_FOG_COL_RAM.rgb,fog_mode2(gl_FragCoord.w)); \n\
	#endif\n\
	#if pp_Texture==1 \n\
	{ \n\
		lowp vec4 texcol=texture(tex, vtx_uv); \n\
		 \n\
		#if pp_BumpMap == 1 \n\
			highp float s = PI / 2.0 * (texcol.a * 15.0 * 16.0 + texcol.r * 15.0) / 255.0; \n\
			highp float r = 2.0 * PI * (texcol.g * 15.0 * 16.0 + texcol.b * 15.0) / 255.0; \n\
			texcol.a = clamp(vtx_offs.a + vtx_offs.r * sin(s) + vtx_offs.g * cos(s) * cos(r - 2.0 * PI * vtx_offs.b), 0.0, 1.0); \n\
			texcol.rgb = vec3(1.0, 1.0, 1.0);	 \n\
		#else\n\
			#if pp_IgnoreTexA==1 \n\
				texcol.a=1.0;	 \n\
			#endif\n\
			\n\
			#if cp_AlphaTest == 1 \n\
				if (cp_AlphaTestValue > texcol.a) \n\
					discard; \n\
			#endif  \n\
		#endif \n\
		#if pp_ShadInstr==0 \n\
		{ \n\
			color=texcol; \n\
		} \n\
		#endif\n\
		#if pp_ShadInstr==1 \n\
		{ \n\
			color.rgb*=texcol.rgb; \n\
			color.a=texcol.a; \n\
		} \n\
		#endif\n\
		#if pp_ShadInstr==2 \n\
		{ \n\
			color.rgb=mix(color.rgb,texcol.rgb,texcol.a); \n\
		} \n\
		#endif\n\
		#if  pp_ShadInstr==3 \n\
		{ \n\
			color*=texcol; \n\
		} \n\
		#endif\n\
		\n\
		#if pp_Offset==1 && pp_BumpMap == 0 \n\
		{ \n\
			color.rgb+=vtx_offs.rgb; \n\
		} \n\
		#endif\n\
	} \n\
	#endif\n\
	 \n\
	color = fog_clamp(color); \n\
	 \n\
	#if pp_FogCtrl == 0 \n\
	{ \n\
		color.rgb=mix(color.rgb,sp_FOG_COL_RAM.rgb,fog_mode2(gl_FragCoord.w));  \n\
	} \n\
	#endif\n\
	#if pp_FogCtrl == 1 && pp_Offset==1 && pp_BumpMap == 0 \n\
	{ \n\
		color.rgb=mix(color.rgb,sp_FOG_COL_VERT.rgb,vtx_offs.a); \n\
	} \n\
	#endif\n\
	 \n\
	#if pp_TriLinear == 1 \n\
	color *= trilinear_alpha; \n\
	#endif \n\
	 \n\
	#if cp_AlphaTest == 1 \n\
		color.a=1.0; \n\
	#endif  \n\
	//color.rgb=vec3(gl_FragCoord.w * sp_FOG_DENSITY / 128.0);\n\
#if TARGET_GL != GLES2 \n\
	highp float w = gl_FragCoord.w * 100000.0; \n\
	gl_FragDepth = log2(1.0 + w) / 34.0; \n\
#endif \n\
	gl_FragColor =color; \n\
}";

const char* ModifierVolumeShader =
"\
%s \n\
#define TARGET_GL %s \n\
 \n\
#define GLES2 0 \n\
#define GLES3 1 \n\
#define GL2 2 \n\
#define GL3 3 \n\
 \n\
#if TARGET_GL == GL2 \n\
#define highp \n\
#define lowp \n\
#define mediump \n\
#endif \n\
#if TARGET_GL != GLES2 && TARGET_GL != GL2 \n\
out highp vec4 FragColor; \n\
#define gl_FragColor FragColor \n\
#endif \n\
 \n\
uniform lowp float sp_ShaderColor; \n\
/* Vertex input*/ \n\
void main() \n\
{ \n\
#if TARGET_GL != GLES2 \n\
	highp float w = gl_FragCoord.w * 100000.0; \n\
	gl_FragDepth = log2(1.0 + w) / 34.0; \n\
#endif \n\
	gl_FragColor=vec4(0.0, 0.0, 0.0, sp_ShaderColor); \n\
}";

const char* OSD_VertexShader =
"\
%s \n\
#define TARGET_GL %s \n\
 \n\
#define GLES2 0 \n\
#define GLES3 1 \n\
#define GL2 2 \n\
#define GL3 3 \n\
 \n\
#if TARGET_GL == GL2 \n\
#define highp \n\
#define lowp \n\
#define mediump \n\
#endif \n\
#if TARGET_GL == GLES2 || TARGET_GL == GL2 \n\
#define in attribute \n\
#define out varying \n\
#endif \n\
 \n\
uniform highp vec4      scale; \n\
 \n\
in highp vec4    in_pos; \n\
in lowp vec4     in_base; \n\
in mediump vec2  in_uv; \n\
 \n\
out lowp vec4 vtx_base; \n\
out mediump vec2 vtx_uv; \n\
 \n\
void main() \n\
{ \n\
	vtx_base = in_base; \n\
	vtx_uv = in_uv; \n\
	highp vec4 vpos = in_pos; \n\
	\n\
	vpos.w = 1.0; \n\
	vpos.z = vpos.w; \n\
	vpos.xy = vpos.xy * scale.xy - scale.zw;  \n\
	gl_Position = vpos; \n\
}";

const char* OSD_Shader =
"\
%s \n\
#define TARGET_GL %s \n\
 \n\
#define GLES2 0 \n\
#define GLES3 1 \n\
#define GL2 2 \n\
#define GL3 3 \n\
 \n\
#if TARGET_GL == GL2 \n\
#define highp \n\
#define lowp \n\
#define mediump \n\
#endif \n\
#if TARGET_GL != GLES2 && TARGET_GL != GL2 \n\
out highp vec4 FragColor; \n\
#define gl_FragColor FragColor \n\
#else \n\
#define in varying \n\
#define texture texture2D \n\
#endif \n\
 \n\
in lowp vec4 vtx_base; \n\
in mediump vec2 vtx_uv; \n\
 \n\
uniform sampler2D tex; \n\
void main() \n\
{ \n\
	gl_FragColor = vtx_base * texture(tex, vtx_uv); \n\
}";

GLCache glcache;
gl_ctx gl;

int screen_width;
int screen_height;
GLuint fogTextureId;

#ifdef TEST_AUTOMATION
static void dump_screenshot(u8 *buffer, u32 width, u32 height)
{
	FILE *fp = fopen("screenshot.png", "wb");
	if (fp == NULL)
	{
		ERROR_LOG(RENDERER, "Failed to open screenshot.png for writing\n");
		return;
	}

	png_bytepp rows = (png_bytepp)malloc(height * sizeof(png_bytep));
	for (int y = 0; y < height; y++)
	{
		rows[height - y - 1] = (png_bytep)buffer + y * width * 3;
	}

	png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	png_infop info_ptr = png_create_info_struct(png_ptr);

	png_init_io(png_ptr, fp);


	// write header
	png_set_IHDR(png_ptr, info_ptr, width, height,
			 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
			 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);

	png_write_info(png_ptr, info_ptr);


	// write bytes
	png_write_image(png_ptr, rows);

	// end write
	png_write_end(png_ptr, NULL);
	fclose(fp);

	free(rows);

}

void do_swap_automation()
{
	static FILE* video_file = fopen(cfgLoadStr("record", "rawvid","").c_str(), "wb");
	extern bool do_screenshot;

	if (video_file)
	{
		int bytesz = screen_width * screen_height * 3;
		u8* img = new u8[bytesz];
		
		glReadPixels(0, 0, screen_width, screen_height, GL_RGB, GL_UNSIGNED_BYTE, img);
		fwrite(img, 1, bytesz, video_file);
		fflush(video_file);
	}

	if (do_screenshot)
	{
		extern void dc_exit();
		int bytesz = screen_width * screen_height * 3;
		u8* img = new u8[bytesz];
		
		glReadPixels(0, 0, screen_width, screen_height, GL_RGB, GL_UNSIGNED_BYTE, img);
		dump_screenshot(img, screen_width, screen_height);
		delete[] img;
		dc_exit();
		exit(0);
	}
}

#endif

static void gl_delete_shaders()
{
	for (auto it : gl.shaders)
	{
		if (it.second.program != 0)
			glcache.DeleteProgram(it.second.program);
	}
	gl.shaders.clear();
	glcache.DeleteProgram(gl.modvol_shader.program);
	gl.modvol_shader.program = 0;
}

static void gles_term()
{
	glDeleteBuffers(1, &gl.vbo.geometry);
	gl.vbo.geometry = 0;
	glDeleteBuffers(1, &gl.vbo.modvols);
	glDeleteBuffers(1, &gl.vbo.idxs);
	glDeleteBuffers(1, &gl.vbo.idxs2);
	glcache.DeleteTextures(1, &fbTextureId);
	fbTextureId = 0;
	glcache.DeleteTextures(1, &fogTextureId);
	fogTextureId = 0;
	gl_free_osd_resources();
	free_output_framebuffer();

	gl_delete_shaders();
}

void findGLVersion()
{
	gl.index_type = GL_UNSIGNED_INT;
	gl.gl_major = theGLContext.GetMajorVersion();
	gl.is_gles = theGLContext.IsGLES();
	if (gl.is_gles)
	{
		if (gl.gl_major >= 3)
		{
			gl.gl_version = "GLES3";
			gl.glsl_version_header = "#version 300 es";
		}
		else
		{
			gl.gl_version = "GLES2";
			gl.glsl_version_header = "";
			gl.index_type = GL_UNSIGNED_SHORT;
		}
		gl.fog_image_format = GL_ALPHA;
		const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
		if (strstr(extensions, "GL_OES_packed_depth_stencil") != NULL)
			gl.GL_OES_packed_depth_stencil_supported = true;
		if (strstr(extensions, "GL_OES_depth24") != NULL)
			gl.GL_OES_depth24_supported = true;
		if (!gl.GL_OES_packed_depth_stencil_supported)
			INFO_LOG(RENDERER, "Packed depth/stencil not supported: no modifier volumes when rendering to a texture");
	}
	else
	{
    	if (gl.gl_major >= 3)
    	{
			gl.gl_version = "GL3";
#if HOST_OS == OS_DARWIN
			gl.glsl_version_header = "#version 150";
#else
			gl.glsl_version_header = "#version 130";
#endif
			gl.fog_image_format = GL_RED;
		}
		else
		{
			gl.gl_version = "GL2";
			gl.glsl_version_header = "#version 120";
			gl.fog_image_format = GL_ALPHA;
		}
	}
}

struct ShaderUniforms_t ShaderUniforms;

GLuint gl_CompileShader(const char* shader,GLuint type)
{
	GLint result;
	GLint compile_log_len;
	GLuint rv=glCreateShader(type);
	glShaderSource(rv, 1,&shader, NULL);
	glCompileShader(rv);

	//lets see if it compiled ...
	glGetShaderiv(rv, GL_COMPILE_STATUS, &result);
	glGetShaderiv(rv, GL_INFO_LOG_LENGTH, &compile_log_len);

	if (!result && compile_log_len>0)
	{
		char* compile_log=(char*)malloc(compile_log_len);
		*compile_log=0;

		glGetShaderInfoLog(rv, compile_log_len, &compile_log_len, compile_log);
		WARN_LOG(RENDERER, "Shader: %s \n%s", result ? "compiled!" : "failed to compile", compile_log);

		free(compile_log);
	}

	return rv;
}

GLuint gl_CompileAndLink(const char* VertexShader, const char* FragmentShader)
{
	//create shaders
	GLuint vs=gl_CompileShader(VertexShader ,GL_VERTEX_SHADER);
	GLuint ps=gl_CompileShader(FragmentShader ,GL_FRAGMENT_SHADER);

	GLuint program = glCreateProgram();
	glAttachShader(program, vs);
	glAttachShader(program, ps);

	//bind vertex attribute to vbo inputs
	glBindAttribLocation(program, VERTEX_POS_ARRAY,      "in_pos");
	glBindAttribLocation(program, VERTEX_COL_BASE_ARRAY, "in_base");
	glBindAttribLocation(program, VERTEX_COL_OFFS_ARRAY, "in_offs");
	glBindAttribLocation(program, VERTEX_UV_ARRAY,       "in_uv");
	glBindAttribLocation(program, VERTEX_COL_BASE1_ARRAY, "in_base1");
	glBindAttribLocation(program, VERTEX_COL_OFFS1_ARRAY, "in_offs1");
	glBindAttribLocation(program, VERTEX_UV1_ARRAY,       "in_uv1");

#ifdef glBindFragDataLocation
	if (!gl.is_gles && gl.gl_major >= 3)
		glBindFragDataLocation(program, 0, "FragColor");
#endif

	glLinkProgram(program);

	GLint result;
	glGetProgramiv(program, GL_LINK_STATUS, &result);


	GLint compile_log_len;
	glGetProgramiv(program, GL_INFO_LOG_LENGTH, &compile_log_len);

	if (!result && compile_log_len>0)
	{
		compile_log_len+= 1024;
		char* compile_log=(char*)malloc(compile_log_len);
		*compile_log=0;

		glGetProgramInfoLog(program, compile_log_len, &compile_log_len, compile_log);
		WARN_LOG(RENDERER, "Shader linking: %s \n (%d bytes), - %s -", result ? "linked" : "failed to link", compile_log_len, compile_log);

		free(compile_log);

		// Dump the shaders source for troubleshooting
		INFO_LOG(RENDERER, "// VERTEX SHADER\n%s\n// END", VertexShader);
		INFO_LOG(RENDERER, "// FRAGMENT SHADER\n%s\n// END", FragmentShader);
		die("shader compile fail\n");
	}

	glDeleteShader(vs);
	glDeleteShader(ps);

	glcache.UseProgram(program);

	verify(glIsProgram(program));

	return program;
}

PipelineShader *GetProgram(u32 cp_AlphaTest, u32 pp_ClipTestMode,
							u32 pp_Texture, u32 pp_UseAlpha, u32 pp_IgnoreTexA, u32 pp_ShadInstr, u32 pp_Offset,
							u32 pp_FogCtrl, bool pp_Gouraud, bool pp_BumpMap, bool fog_clamping, bool trilinear)
{
	if (settings.rend.Rotate90 != gl.rotate90)
	{
		gl_delete_shaders();
		gl.rotate90 = settings.rend.Rotate90;
	}
	u32 rv=0;

	rv|=pp_ClipTestMode;
	rv<<=1; rv|=cp_AlphaTest;
	rv<<=1; rv|=pp_Texture;
	rv<<=1; rv|=pp_UseAlpha;
	rv<<=1; rv|=pp_IgnoreTexA;
	rv<<=2; rv|=pp_ShadInstr;
	rv<<=1; rv|=pp_Offset;
	rv<<=2; rv|=pp_FogCtrl;
	rv<<=1; rv|=pp_Gouraud;
	rv<<=1; rv|=pp_BumpMap;
	rv<<=1; rv|=fog_clamping;
	rv<<=1; rv|=trilinear;

	PipelineShader *shader = &gl.shaders[rv];
	if (shader->program == 0)
	{
		shader->cp_AlphaTest = cp_AlphaTest;
		shader->pp_ClipTestMode = pp_ClipTestMode-1;
		shader->pp_Texture = pp_Texture;
		shader->pp_UseAlpha = pp_UseAlpha;
		shader->pp_IgnoreTexA = pp_IgnoreTexA;
		shader->pp_ShadInstr = pp_ShadInstr;
		shader->pp_Offset = pp_Offset;
		shader->pp_FogCtrl = pp_FogCtrl;
		shader->pp_Gouraud = pp_Gouraud;
		shader->pp_BumpMap = pp_BumpMap;
		shader->fog_clamping = fog_clamping;
		shader->trilinear = trilinear;
		CompilePipelineShader(shader);
	}

	return shader;
}

bool CompilePipelineShader(	PipelineShader* s)
{
	char vshader[8192];

	sprintf(vshader, VertexShaderSource, gl.glsl_version_header, gl.gl_version, s->pp_Gouraud, settings.rend.Rotate90);

	char pshader[8192];

	sprintf(pshader,PixelPipelineShader, gl.glsl_version_header, gl.gl_version,
                s->cp_AlphaTest,s->pp_ClipTestMode,s->pp_UseAlpha,
                s->pp_Texture,s->pp_IgnoreTexA,s->pp_ShadInstr,s->pp_Offset,s->pp_FogCtrl, s->pp_Gouraud, s->pp_BumpMap,
				s->fog_clamping, s->trilinear);

	s->program=gl_CompileAndLink(vshader, pshader);


	//setup texture 0 as the input for the shader
	GLuint gu=glGetUniformLocation(s->program, "tex");
	if (s->pp_Texture==1)
		glUniform1i(gu,0);

	//get the uniform locations
	s->scale	            = glGetUniformLocation(s->program, "scale");
	s->depth_scale      = glGetUniformLocation(s->program, "depth_scale");
	s->extra_depth_scale = glGetUniformLocation(s->program, "extra_depth_scale");

	s->pp_ClipTest      = glGetUniformLocation(s->program, "pp_ClipTest");

	s->sp_FOG_DENSITY   = glGetUniformLocation(s->program, "sp_FOG_DENSITY");

	s->cp_AlphaTestValue= glGetUniformLocation(s->program, "cp_AlphaTestValue");

	//FOG_COL_RAM,FOG_COL_VERT,FOG_DENSITY;
	if (s->pp_FogCtrl==1 && s->pp_Texture==1)
		s->sp_FOG_COL_VERT=glGetUniformLocation(s->program, "sp_FOG_COL_VERT");
	else
		s->sp_FOG_COL_VERT=-1;
	if (s->pp_FogCtrl==0 || s->pp_FogCtrl==3)
	{
		s->sp_FOG_COL_RAM=glGetUniformLocation(s->program, "sp_FOG_COL_RAM");
	}
	else
	{
		s->sp_FOG_COL_RAM=-1;
	}
	// Setup texture 1 as the fog table
	gu = glGetUniformLocation(s->program, "fog_table");
	if (gu != -1)
		glUniform1i(gu, 1);
	s->trilinear_alpha = glGetUniformLocation(s->program, "trilinear_alpha");
	
	if (s->fog_clamping)
	{
		s->fog_clamp_min = glGetUniformLocation(s->program, "fog_clamp_min");
		s->fog_clamp_max = glGetUniformLocation(s->program, "fog_clamp_max");
	}
	else
	{
		s->fog_clamp_min = -1;
		s->fog_clamp_max = -1;
	}

	ShaderUniforms.Set(s);

	return glIsProgram(s->program)==GL_TRUE;
}

static void SetupOSDVBO()
{
#ifndef GLES2
	if (gl.gl_major >= 3)
	{
		if (gl.OSD_SHADER.vao == 0)
			glGenVertexArrays(1, &gl.OSD_SHADER.vao);
		glBindVertexArray(gl.OSD_SHADER.vao);
	}
#endif
	if (gl.OSD_SHADER.geometry == 0)
		glGenBuffers(1, &gl.OSD_SHADER.geometry);
	glBindBuffer(GL_ARRAY_BUFFER, gl.OSD_SHADER.geometry);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

	//setup vertex buffers attrib pointers
	glEnableVertexAttribArray(VERTEX_POS_ARRAY);
	glVertexAttribPointer(VERTEX_POS_ARRAY, 2, GL_FLOAT, GL_FALSE, sizeof(OSDVertex), (void*)offsetof(OSDVertex, x));

	glEnableVertexAttribArray(VERTEX_COL_BASE_ARRAY);
	glVertexAttribPointer(VERTEX_COL_BASE_ARRAY, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(OSDVertex), (void*)offsetof(OSDVertex, r));

	glEnableVertexAttribArray(VERTEX_UV_ARRAY);
	glVertexAttribPointer(VERTEX_UV_ARRAY, 2, GL_FLOAT, GL_FALSE, sizeof(OSDVertex), (void*)offsetof(OSDVertex, u));

	glDisableVertexAttribArray(VERTEX_COL_OFFS_ARRAY);
	glCheck();
}

void gl_load_osd_resources()
{
	char vshader[8192];
	char fshader[8192];

	sprintf(vshader, OSD_VertexShader, gl.glsl_version_header, gl.gl_version);
	sprintf(fshader, OSD_Shader, gl.glsl_version_header, gl.gl_version);

	gl.OSD_SHADER.program = gl_CompileAndLink(vshader, fshader);
	gl.OSD_SHADER.scale = glGetUniformLocation(gl.OSD_SHADER.program, "scale");
	glUniform1i(glGetUniformLocation(gl.OSD_SHADER.program, "tex"), 0);		//bind osd texture to slot 0

#ifdef __ANDROID__
	int w, h;
	if (gl.OSD_SHADER.osd_tex == 0)
		gl.OSD_SHADER.osd_tex = loadPNG(get_readonly_data_path(DATA_PATH "buttons.png"), w, h);
#endif
	SetupOSDVBO();
}

void gl_free_osd_resources()
{
	glcache.DeleteProgram(gl.OSD_SHADER.program);

    if (gl.OSD_SHADER.osd_tex != 0) {
        glcache.DeleteTextures(1, &gl.OSD_SHADER.osd_tex);
        gl.OSD_SHADER.osd_tex = 0;
    }
	glDeleteBuffers(1, &gl.OSD_SHADER.geometry);
	gl.OSD_SHADER.geometry = 0;
#ifndef GLES2
	glDeleteVertexArrays(1, &gl.OSD_SHADER.vao);
	gl.OSD_SHADER.vao = 0;
#endif
}

static void create_modvol_shader()
{
	if (gl.modvol_shader.program != 0)
		return;
	char vshader[8192];
	sprintf(vshader, VertexShaderSource, gl.glsl_version_header, gl.gl_version, 1, settings.rend.Rotate90);
	char fshader[8192];
	sprintf(fshader, ModifierVolumeShader, gl.glsl_version_header, gl.gl_version);

	gl.modvol_shader.program=gl_CompileAndLink(vshader, fshader);
	gl.modvol_shader.scale          = glGetUniformLocation(gl.modvol_shader.program, "scale");
	gl.modvol_shader.sp_ShaderColor = glGetUniformLocation(gl.modvol_shader.program, "sp_ShaderColor");
	gl.modvol_shader.depth_scale    = glGetUniformLocation(gl.modvol_shader.program, "depth_scale");
	gl.modvol_shader.extra_depth_scale = glGetUniformLocation(gl.modvol_shader.program, "extra_depth_scale");
}

bool gl_create_resources()
{
	if (gl.vbo.geometry != 0)
		// Assume the resources have already been created
		return true;

	findGLVersion();

	if (gl.gl_major >= 3)
	{
		verify(glGenVertexArrays != NULL);
		//create vao
		//This is really not "proper", vaos are supposed to be defined once
		//i keep updating the same one to make the es2 code work in 3.1 context
#ifndef GLES2
		glGenVertexArrays(1, &gl.vbo.vao);
#endif
	}

	//create vbos
	glGenBuffers(1, &gl.vbo.geometry);
	glGenBuffers(1, &gl.vbo.modvols);
	glGenBuffers(1, &gl.vbo.idxs);
	glGenBuffers(1, &gl.vbo.idxs2);

	create_modvol_shader();

	gl_load_osd_resources();

	return true;
}

GLuint gl_CompileShader(const char* shader,GLuint type);

bool gl_create_resources();

//setup


bool gles_init()
{
	glcache.EnableCache();

	if (!gl_create_resources())
		return false;

	//    glEnable(GL_DEBUG_OUTPUT);
	//    glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
	//    glDebugMessageCallback(gl_DebugOutput, NULL);
	//    glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, NULL, GL_TRUE);

	//clean up the buffer
	glcache.ClearColor(0.f, 0.f, 0.f, 0.f);
	glClear(GL_COLOR_BUFFER_BIT);
	theGLContext.Swap();

#ifdef GL_GENERATE_MIPMAP_HINT
	if (gl.is_gles)
		glHint(GL_GENERATE_MIPMAP_HINT, GL_FASTEST);
#endif
	glCheck();

	if (settings.rend.TextureUpscale > 1)
	{
		// Trick to preload the tables used by xBRZ
		u32 src[] { 0x11111111, 0x22222222, 0x33333333, 0x44444444 };
		u32 dst[16];
		UpscalexBRZ(2, src, dst, 2, 2, false);
	}
	fog_needs_update = true;

	return true;
}


void UpdateFogTexture(u8 *fog_table, GLenum texture_slot, GLint fog_image_format)
{
	glActiveTexture(texture_slot);
	if (fogTextureId == 0)
	{
		fogTextureId = glcache.GenTexture();
		glcache.BindTexture(GL_TEXTURE_2D, fogTextureId);
		glcache.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glcache.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glcache.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
		glcache.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	}
	else
		glcache.BindTexture(GL_TEXTURE_2D, fogTextureId);

	u8 temp_tex_buffer[256];
	MakeFogTexture(temp_tex_buffer);

    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
	glTexImage2D(GL_TEXTURE_2D, 0, fog_image_format, 128, 2, 0, fog_image_format, GL_UNSIGNED_BYTE, temp_tex_buffer);
	glCheck();

	glActiveTexture(GL_TEXTURE0);
}

void OSD_DRAW(bool clear_screen)
{
#ifdef __ANDROID__
	if (gl.OSD_SHADER.osd_tex == 0)
		gl_load_osd_resources();
	if (gl.OSD_SHADER.osd_tex != 0)
	{
		const std::vector<OSDVertex>& osdVertices = GetOSDVertices();

#ifndef GLES2
		if (gl.gl_major >= 3)
			glBindVertexArray(gl.OSD_SHADER.vao);
		else
#endif
			SetupOSDVBO();

		glBindBuffer(GL_ARRAY_BUFFER, gl.OSD_SHADER.geometry);

		verify(glIsProgram(gl.OSD_SHADER.program));
		glcache.UseProgram(gl.OSD_SHADER.program);

		float scale_h = screen_height / 480.f;
		float offs_x = (screen_width - scale_h * 640.f) / 2.f;
		float scale[4];
		scale[0] = 2.f / (screen_width / scale_h);
		scale[1]= -2.f / 480.f;
		scale[2]= 1.f - 2.f * offs_x / screen_width;
		scale[3]= -1.f;
		glUniform4fv(gl.OSD_SHADER.scale, 1, scale);

		glActiveTexture(GL_TEXTURE0);
		glcache.BindTexture(GL_TEXTURE_2D, gl.OSD_SHADER.osd_tex);

		glBindFramebuffer(GL_FRAMEBUFFER, 0);

		glBufferData(GL_ARRAY_BUFFER, osdVertices.size() * sizeof(OSDVertex), osdVertices.data(), GL_STREAM_DRAW); glCheck();

		glcache.Enable(GL_BLEND);
		glcache.Disable(GL_DEPTH_TEST);
		glcache.BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

		glcache.DepthMask(false);
		glcache.DepthFunc(GL_ALWAYS);

		glcache.Disable(GL_CULL_FACE);
		glcache.Disable(GL_SCISSOR_TEST);
		glViewport(0, 0, screen_width, screen_height);

		if (clear_screen)
		{
			glcache.ClearColor(0.7f, 0.7f, 0.7f, 1.f);
			glClear(GL_COLOR_BUFFER_BIT);
		}
		int dfa = osdVertices.size() / 4;

		for (int i = 0; i < dfa; i++)
			glDrawArrays(GL_TRIANGLE_STRIP, i * 4, 4);

		glCheck();
	}
#endif
	gui_display_osd();
}

bool ProcessFrame(TA_context* ctx)
{
	ctx->rend_inuse.Lock();

	if (KillTex)
		TexCache.Clear();

	if (ctx->rend.isRenderFramebuffer)
	{
		RenderFramebuffer();
		ctx->rend_inuse.Unlock();
	}
	else
	{
		if (!ta_parse_vdrc(ctx))
			return false;
	}
	TexCache.CollectCleanup();

	if (ctx->rend.Overrun)
		WARN_LOG(PVR, "ERROR: TA context overrun");

	return !ctx->rend.Overrun;
}

static void upload_vertex_indices()
{
	if (gl.index_type == GL_UNSIGNED_SHORT)
	{
		static bool overrun;
		static List<u16> short_idx;
		if (short_idx.daty != NULL)
			short_idx.Free();
		short_idx.Init(pvrrc.idx.used(), &overrun, NULL);
		for (u32 *p = pvrrc.idx.head(); p < pvrrc.idx.LastPtr(0); p++)
			*(short_idx.Append()) = *p;
		glBufferData(GL_ELEMENT_ARRAY_BUFFER, short_idx.bytes(), short_idx.head(), GL_STREAM_DRAW);
	}
	else
		glBufferData(GL_ELEMENT_ARRAY_BUFFER,pvrrc.idx.bytes(),pvrrc.idx.head(),GL_STREAM_DRAW);
	glCheck();
}

bool RenderFrame()
{
	DoCleanup();
	create_modvol_shader();

	bool is_rtt=pvrrc.isRTT;

	//if (FrameCount&7) return;

	//Setup the matrix

	//TODO: Make this dynamic
	float vtx_min_fZ=0.f;	//pvrrc.fZ_min;
	float vtx_max_fZ=pvrrc.fZ_max;

	//sanitise the values, now with NaN detection (for omap)
	//0x49800000 is 1024*1024. Using integer math to avoid issues w/ infs and nans
	if ((s32&)vtx_max_fZ<0 || (u32&)vtx_max_fZ>0x49800000)
		vtx_max_fZ=10*1024;


	//add some extra range to avoid clipping border cases
	vtx_min_fZ*=0.98f;
	vtx_max_fZ*=1.001f;

	//calculate a projection so that it matches the pvr x,y setup, and
	//a) Z is linearly scaled between 0 ... 1
	//b) W is passed though for proper perspective calculations

	/*
	PowerVR coords:
	fx, fy (pixel coordinates)
	fz=1/w

	(as a note, fx=x*fz;fy=y*fz)

	Clip space
	-Wc .. Wc, xyz
	x: left-right, y: bottom-top
	NDC space
	-1 .. 1, xyz
	Window space:
	translated NDC (viewport, glDepth)

	Attributes:
	//this needs to be cleared up, been some time since I wrote my rasteriser and i'm starting
	//to forget/mixup stuff
	vaX         -> VS output
	iaX=vaX*W   -> value to be interpolated
	iaX',W'     -> interpolated values
	paX=iaX'/W' -> Per pixel interpolated value for attribute


	Proper mappings:
	Output from shader:
	W=1/fz
	x=fx*W -> maps to fx after perspective divide
	y=fy*W ->         fy   -//-
	z=-W for min, W for max. Needs to be linear.



	umodified W, perfect mapping:
	Z mapping:
	pz=z/W
	pz=z/(1/fz)
	pz=z*fz
	z=zt_s+zt_o
	pz=(zt_s+zt_o)*fz
	pz=zt_s*fz+zt_o*fz
	zt_s=scale
	zt_s=2/(max_fz-min_fz)
	zt_o*fz=-min_fz-1
	zt_o=(-min_fz-1)/fz == (-min_fz-1)*W


	x=fx/(fx_range/2)-1		//0 to max -> -1 to 1
	y=fy/(-fy_range/2)+1	//0 to max -> 1 to -1
	z=-min_fz*W + (zt_s-1)  //0 to +inf -> -1 to 1

	o=a*z+c
	1=a*z_max+c
	-1=a*z_min+c

	c=-a*z_min-1
	1=a*z_max-a*z_min-1
	2=a*(z_max-z_min)
	a=2/(z_max-z_min)
	*/

	//float B=2/(min_invW-max_invW);
	//float A=-B*max_invW+vnear;

	//these should be adjusted based on the current PVR scaling etc params
	float dc_width=640;
	float dc_height=480;

	if (!is_rtt)
	{
		gcflip=0;
	}
	else
	{
		gcflip=1;

		//For some reason this produces wrong results
		//so for now its hacked based like on the d3d code
		/*
		u32 pvr_stride=(FB_W_LINESTRIDE.stride)*8;
		*/
		dc_width = pvrrc.fb_X_CLIP.max - pvrrc.fb_X_CLIP.min + 1;
		dc_height = pvrrc.fb_Y_CLIP.max - pvrrc.fb_Y_CLIP.min + 1;
	}

	scale_x = 1;
	scale_y = 1;

	float scissoring_scale_x = 1;

	if (!is_rtt && !pvrrc.isRenderFramebuffer)
	{
		scale_x=fb_scale_x;
		scale_y=fb_scale_y;
		if (SCALER_CTL.interlace == 0 && SCALER_CTL.vscalefactor > 0x400)
			scale_y *= roundf((float)SCALER_CTL.vscalefactor / 0x400);

		//work out scaling parameters !
		//Pixel doubling is on VO, so it does not affect any pixel operations
		//A second scaling is used here for scissoring
		if (VO_CONTROL.pixel_double)
		{
			scissoring_scale_x = 0.5f;
			scale_x *= 0.5f;
		}

		if (SCALER_CTL.hscale)
		{
            scissoring_scale_x /= 2;
			scale_x*=2;
		}
	}

	dc_width  *= scale_x;
	dc_height *= scale_y;

	/*

	float vnear=0;
	float vfar =1;

	float max_invW=1/vtx_min_fZ;
	float min_invW=1/vtx_max_fZ;

	float B=vfar/(min_invW-max_invW);
	float A=-B*max_invW+vnear;


	GLfloat dmatrix[16] =
	{
		(2.f/dc_width)  ,0                ,-(640/dc_width)              ,0  ,
		0               ,-(2.f/dc_height) ,(480/dc_height)              ,0  ,
		0               ,0                ,A                            ,B  ,
		0               ,0                ,1                            ,0
	};

	glUniformMatrix4fv(gl.matrix, 1, GL_FALSE, dmatrix);

	*/

	/*
		Handle Dc to screen scaling
	*/
	float screen_stretching = settings.rend.ScreenStretching / 100.f;
	float screen_scaling = settings.rend.ScreenScaling / 100.f;

	float dc2s_scale_h;
	float ds2s_offs_x;

	if (is_rtt)
	{
		ShaderUniforms.scale_coefs[0] = 2.0f / dc_width;
		ShaderUniforms.scale_coefs[1] = 2.0f / dc_height;	// FIXME CT2 needs 480 here instead of dc_height=512
		ShaderUniforms.scale_coefs[2] = 1;
		ShaderUniforms.scale_coefs[3] = 1;
	}
	else
	{
		if (settings.rend.Rotate90)
		{
			dc2s_scale_h = screen_height / 640.0f;
			ds2s_offs_x =  (screen_width - dc2s_scale_h * 480.0f * screen_stretching) / 2;
			ShaderUniforms.scale_coefs[0] = 2.0f / (screen_width / dc2s_scale_h * scale_x) * screen_stretching;
			ShaderUniforms.scale_coefs[1] = -2.0f / dc_width;
			ShaderUniforms.scale_coefs[2] = 1 - 2 * ds2s_offs_x / screen_width;
			ShaderUniforms.scale_coefs[3] = 1;
		}
		else
		{
			dc2s_scale_h = screen_height / 480.0f;
			ds2s_offs_x =  (screen_width - dc2s_scale_h * 640.0f * screen_stretching) / 2;
			ShaderUniforms.scale_coefs[0] = 2.0f / (screen_width / dc2s_scale_h * scale_x) * screen_stretching;
			ShaderUniforms.scale_coefs[1] = -2.0f / dc_height;
			ShaderUniforms.scale_coefs[2] = 1 - 2 * ds2s_offs_x / screen_width;
			ShaderUniforms.scale_coefs[3] = -1;
		}
		//-1 -> too much to left
	}

	ShaderUniforms.depth_coefs[0]=2/(vtx_max_fZ-vtx_min_fZ);
	ShaderUniforms.depth_coefs[1]=-vtx_min_fZ-1;
	ShaderUniforms.depth_coefs[2]=0;
	ShaderUniforms.depth_coefs[3]=0;

	ShaderUniforms.extra_depth_scale = settings.rend.ExtraDepthScale;

	//DEBUG_LOG(RENDERER, "scale: %f, %f, %f, %f", ShaderUniforms.scale_coefs[0], ShaderUniforms.scale_coefs[1], ShaderUniforms.scale_coefs[2], ShaderUniforms.scale_coefs[3]);


	//VERT and RAM fog color constants
	u8* fog_colvert_bgra=(u8*)&FOG_COL_VERT;
	u8* fog_colram_bgra=(u8*)&FOG_COL_RAM;
	ShaderUniforms.ps_FOG_COL_VERT[0]=fog_colvert_bgra[2]/255.0f;
	ShaderUniforms.ps_FOG_COL_VERT[1]=fog_colvert_bgra[1]/255.0f;
	ShaderUniforms.ps_FOG_COL_VERT[2]=fog_colvert_bgra[0]/255.0f;

	ShaderUniforms.ps_FOG_COL_RAM[0]=fog_colram_bgra [2]/255.0f;
	ShaderUniforms.ps_FOG_COL_RAM[1]=fog_colram_bgra [1]/255.0f;
	ShaderUniforms.ps_FOG_COL_RAM[2]=fog_colram_bgra [0]/255.0f;

	//Fog density constant
	u8* fog_density=(u8*)&FOG_DENSITY;
	float fog_den_mant=fog_density[1]/128.0f;  //bit 7 -> x. bit, so [6:0] -> fraction -> /128
	s32 fog_den_exp=(s8)fog_density[0];
	ShaderUniforms.fog_den_float=fog_den_mant*powf(2.0f,fog_den_exp);

	ShaderUniforms.fog_clamp_min[0] = ((pvrrc.fog_clamp_min >> 16) & 0xFF) / 255.0f;
	ShaderUniforms.fog_clamp_min[1] = ((pvrrc.fog_clamp_min >> 8) & 0xFF) / 255.0f;
	ShaderUniforms.fog_clamp_min[2] = ((pvrrc.fog_clamp_min >> 0) & 0xFF) / 255.0f;
	ShaderUniforms.fog_clamp_min[3] = ((pvrrc.fog_clamp_min >> 24) & 0xFF) / 255.0f;
	
	ShaderUniforms.fog_clamp_max[0] = ((pvrrc.fog_clamp_max >> 16) & 0xFF) / 255.0f;
	ShaderUniforms.fog_clamp_max[1] = ((pvrrc.fog_clamp_max >> 8) & 0xFF) / 255.0f;
	ShaderUniforms.fog_clamp_max[2] = ((pvrrc.fog_clamp_max >> 0) & 0xFF) / 255.0f;
	ShaderUniforms.fog_clamp_max[3] = ((pvrrc.fog_clamp_max >> 24) & 0xFF) / 255.0f;
	
	if (fog_needs_update && settings.rend.Fog)
	{
		fog_needs_update = false;
		UpdateFogTexture((u8 *)FOG_TABLE, GL_TEXTURE1, gl.fog_image_format);
	}

	glcache.UseProgram(gl.modvol_shader.program);

	glUniform4fv( gl.modvol_shader.scale, 1, ShaderUniforms.scale_coefs);
	glUniform4fv( gl.modvol_shader.depth_scale, 1, ShaderUniforms.depth_coefs);
	glUniform1f(gl.modvol_shader.extra_depth_scale, ShaderUniforms.extra_depth_scale);

	ShaderUniforms.PT_ALPHA=(PT_ALPHA_REF&0xFF)/255.0f;

	for (auto& it : gl.shaders)
	{
		glcache.UseProgram(it.second.program);
		ShaderUniforms.Set(&it.second);
	}

	//setup render target first
	if (is_rtt)
	{
		GLuint channels,format;
		switch(FB_W_CTRL.fb_packmode)
		{
		case 0: //0x0   0555 KRGB 16 bit  (default)	Bit 15 is the value of fb_kval[7].
			channels=GL_RGBA;
			format=GL_UNSIGNED_BYTE;
			break;

		case 1: //0x1   565 RGB 16 bit
			channels=GL_RGB;
			format=GL_UNSIGNED_SHORT_5_6_5;
			break;

		case 2: //0x2   4444 ARGB 16 bit
			channels=GL_RGBA;
			format=GL_UNSIGNED_BYTE;
			break;

		case 3://0x3    1555 ARGB 16 bit    The alpha value is determined by comparison with the value of fb_alpha_threshold.
			channels=GL_RGBA;
			format=GL_UNSIGNED_BYTE;
			break;

		case 4: //0x4   888 RGB 24 bit packed
		case 5: //0x5   0888 KRGB 32 bit    K is the value of fk_kval.
		case 6: //0x6   8888 ARGB 32 bit
			WARN_LOG(RENDERER, "Unsupported render to texture format: %d", FB_W_CTRL.fb_packmode);
			return false;

		case 7: //7     invalid
			die("7 is not valid");
			break;
		}
		DEBUG_LOG(RENDERER, "RTT packmode=%d stride=%d - %d,%d -> %d,%d", FB_W_CTRL.fb_packmode, FB_W_LINESTRIDE.stride * 8,
				FB_X_CLIP.min, FB_Y_CLIP.min, FB_X_CLIP.max, FB_Y_CLIP.max);
		BindRTT(FB_W_SOF1 & VRAM_MASK, dc_width, dc_height, channels, format);
	}
	else
	{
		if (settings.rend.ScreenScaling != 100 || !theGLContext.IsSwapBufferPreserved())
		{
			init_output_framebuffer((int)lroundf(screen_width * screen_scaling), (int)lroundf(screen_height * screen_scaling));
		}
		else
		{
#if HOST_OS != OS_DARWIN
			//Fix this in a proper way
			glBindFramebuffer(GL_FRAMEBUFFER,0);
#endif
			glViewport(0, 0, screen_width, screen_height);
		}
	}

	bool wide_screen_on = !is_rtt && settings.rend.WideScreen
			&& pvrrc.fb_X_CLIP.min == 0
			&& lroundf((pvrrc.fb_X_CLIP.max + 1) / scale_x) == 640L
			&& pvrrc.fb_Y_CLIP.min == 0
			&& lroundf((pvrrc.fb_Y_CLIP.max + 1) / scale_y) == 480L;

	//Color is cleared by the background plane

	glcache.Disable(GL_SCISSOR_TEST);

	glcache.DepthMask(GL_TRUE);
	glClearDepthf(0.0);
	glStencilMask(0xFF); glCheck();
    glClearStencil(0);
	glClear(GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glCheck();

	//move vertex to gpu

	if (!pvrrc.isRenderFramebuffer)
	{
		//Main VBO
		glBindBuffer(GL_ARRAY_BUFFER, gl.vbo.geometry); glCheck();
		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, gl.vbo.idxs); glCheck();

		glBufferData(GL_ARRAY_BUFFER,pvrrc.verts.bytes(),pvrrc.verts.head(),GL_STREAM_DRAW); glCheck();

		upload_vertex_indices();

		//Modvol VBO
		if (pvrrc.modtrig.used())
		{
			glBindBuffer(GL_ARRAY_BUFFER, gl.vbo.modvols); glCheck();
			glBufferData(GL_ARRAY_BUFFER,pvrrc.modtrig.bytes(),pvrrc.modtrig.head(),GL_STREAM_DRAW); glCheck();
		}

		//not all scaling affects pixel operations, scale to adjust for that
		scale_x *= scissoring_scale_x;

		#if 0
			//handy to debug really stupid render-not-working issues ...
			printf("SS: %dx%d\n", screen_width, screen_height);
			printf("SCI: %d, %f\n", pvrrc.fb_X_CLIP.max, dc2s_scale_h);
			printf("SCI: %f, %f, %f, %f\n", offs_x+pvrrc.fb_X_CLIP.min/scale_x,(pvrrc.fb_Y_CLIP.min/scale_y)*dc2s_scale_h,(pvrrc.fb_X_CLIP.max-pvrrc.fb_X_CLIP.min+1)/scale_x*dc2s_scale_h,(pvrrc.fb_Y_CLIP.max-pvrrc.fb_Y_CLIP.min+1)/scale_y*dc2s_scale_h);
		#endif

		if (!wide_screen_on)
		{
			float width = (pvrrc.fb_X_CLIP.max - pvrrc.fb_X_CLIP.min + 1) / scale_x;
			float height = (pvrrc.fb_Y_CLIP.max - pvrrc.fb_Y_CLIP.min + 1) / scale_y;
			float min_x = pvrrc.fb_X_CLIP.min / scale_x;
			float min_y = pvrrc.fb_Y_CLIP.min / scale_y;
			if (!is_rtt)
			{
				if (SCALER_CTL.interlace && SCALER_CTL.vscalefactor > 0x400)
				{
					// Clipping is done after scaling/filtering so account for that if enabled
					height *= (float)SCALER_CTL.vscalefactor / 0x400;
					min_y *= (float)SCALER_CTL.vscalefactor / 0x400;
				}
				if (settings.rend.Rotate90)
				{
					float t = width;
					width = height;
					height = t;
					t = min_x;
					min_x = min_y;
					min_y = 640 - t - height;
				}
				// Add x offset for aspect ratio > 4/3
				min_x = (min_x * dc2s_scale_h * screen_stretching + ds2s_offs_x) * screen_scaling;
				// Invert y coordinates when rendering to screen
				min_y = (screen_height - (min_y + height) * dc2s_scale_h) * screen_scaling;
				width *= dc2s_scale_h * screen_stretching * screen_scaling;
				height *= dc2s_scale_h * screen_scaling;

				if (ds2s_offs_x > 0)
				{
					float scaled_offs_x = ds2s_offs_x * screen_scaling;

					glcache.ClearColor(0.f, 0.f, 0.f, 0.f);
					glcache.Enable(GL_SCISSOR_TEST);
					glScissor(0, 0, (GLsizei)lroundf(scaled_offs_x), (GLsizei)lroundf(screen_height * screen_scaling));
					glClear(GL_COLOR_BUFFER_BIT);
					glScissor((GLint)lroundf(screen_width * screen_scaling - scaled_offs_x), 0, (GLsizei)lroundf(scaled_offs_x) + 1, (GLsizei)lroundf(screen_height * screen_scaling));
					glClear(GL_COLOR_BUFFER_BIT);
				}
			}
			else if (settings.rend.RenderToTextureUpscale > 1 && !settings.rend.RenderToTextureBuffer)
			{
				min_x *= settings.rend.RenderToTextureUpscale;
				min_y *= settings.rend.RenderToTextureUpscale;
				width *= settings.rend.RenderToTextureUpscale;
				height *= settings.rend.RenderToTextureUpscale;
			}

			glScissor((GLint)lroundf(min_x), (GLint)lroundf(min_y), (GLsizei)lroundf(width), (GLsizei)lroundf(height));
			glcache.Enable(GL_SCISSOR_TEST);
		}

		//restore scale_x
		scale_x /= scissoring_scale_x;

		DrawStrips();
	}
	else
	{
		glcache.ClearColor(0.f, 0.f, 0.f, 0.f);
		glClear(GL_COLOR_BUFFER_BIT);
		DrawFramebuffer();
	}
	#ifdef _WIN32
		//Sleep(40); //to test MT stability
	#endif

	eglCheck();

	if (is_rtt)
		ReadRTTBuffer();
	else if (settings.rend.ScreenScaling != 100 || !theGLContext.IsSwapBufferPreserved())
		render_output_framebuffer();

	return !is_rtt;
}

void rend_set_fb_scale(float x,float y)
{
	fb_scale_x=x;
	fb_scale_y=y;
}

struct glesrend : Renderer
{
	bool Init() override { return gles_init(); }
	void Resize(int w, int h) override { screen_width=w; screen_height=h; }
	void Term() override
	{
		TexCache.Clear();
		gles_term();
	}

	bool Process(TA_context* ctx) override { return ProcessFrame(ctx); }
	bool Render() override
	{
		RenderFrame();
		if (!pvrrc.isRTT)
			DrawOSD(false);

		return !pvrrc.isRTT;
	}
	bool RenderLastFrame() override { return !theGLContext.IsSwapBufferPreserved() ? render_output_framebuffer() : false; }
	void Present() override { theGLContext.Swap(); glViewport(0, 0, screen_width, screen_height); }

	void DrawOSD(bool clear_screen) override
	{
		OSD_DRAW(clear_screen);
	}

	virtual u64 GetTexture(TSP tsp, TCW tcw) override
	{
		return gl_GetTexture(tsp, tcw);
	}
};


GLuint loadPNG(const string& fname, int &width, int &height)
{
	png_byte *image_data = loadPNGData(fname, width, height);
	if (image_data == NULL)
		return TEXTURE_LOAD_ERROR;

	//Now generate the OpenGL texture object
	GLuint texture = glcache.GenTexture();
	glcache.BindTexture(GL_TEXTURE_2D, texture);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
		GL_UNSIGNED_BYTE, (GLvoid*) image_data);
	glcache.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

	delete[] image_data;

	return texture;
}


Renderer* rend_GLES2() { return new glesrend(); }