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custom shader for RasterFont, fix color support 

OpenGL2.0 compatible

Signed-off-by: Ryan Houdek <Sonicadvance1@gmail.com>
This commit is contained in:
degasus 2012-12-11 22:08:53 +01:00 committed by Ryan Houdek
parent 23a3336f9a
commit 1bd21f44b2
2 changed files with 60 additions and 8 deletions
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65
Source/Plugins/Plugin_VideoOGL/Src/RasterFont.cpp
View File

@ -126,6 +126,23 @@ const u8 rasters[char_count][char_height] = {
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x8f, 0xf1, 0x60, 0x00, 0x00, 0x00}
};
static const char *s_vertex_shader =
"attribute vec2 vertexPosition;\n"
"attribute vec2 texturePosition;\n"
"varying vec2 tpos;\n"
"void main(void) {\n"
" gl_Position = vec4(vertexPosition,0,1);\n"
" tpos = texturePosition;\n"
"}\n";
static const char *s_fragment_shader =
"uniform sampler2DRect textureSampler;\n"
"uniform vec4 color;\n"
"varying vec2 tpos;\n"
"void main(void) {\n"
" gl_FragColor = texture2DRect(textureSampler,tpos) * color;\n"
"}\n";
RasterFont::RasterFont()
{
// generate the texture
@ -149,12 +166,35 @@ RasterFont::RasterFont()
glGenVertexArrays(1, &VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBindVertexArray(VAO);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, sizeof(GLfloat)*4, NULL);
glEnable(GL_TEXTURE_RECTANGLE);
glClientActiveTexture(GL_TEXTURE0);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, sizeof(GLfloat)*4, (GLfloat*)NULL+2);
glEnableVertexAttribArray(0); // vertexPosition
glVertexAttribPointer(0, 2, GL_FLOAT, 0, sizeof(GLfloat)*4, NULL);
glEnableVertexAttribArray(1); // texturePosition
glVertexAttribPointer(1, 2, GL_FLOAT, 0, sizeof(GLfloat)*4, (GLfloat*)NULL+2);
// generate shader
GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
shader_program = glCreateProgram();
glShaderSource(vertex_shader, 1, &s_vertex_shader, NULL);
glCompileShader(vertex_shader);
glShaderSource(fragment_shader, 1, &s_fragment_shader, NULL);
glCompileShader(fragment_shader);
glAttachShader(shader_program, vertex_shader);
glAttachShader(shader_program, fragment_shader);
glBindAttribLocation(shader_program, 0, "vertexPosition");
glBindAttribLocation(shader_program, 1, "texturePosition");
glLinkProgram(shader_program);
glDeleteShader(vertex_shader);
glDeleteShader(fragment_shader);
// bound uniforms
glUseProgram(shader_program);
glUniform1i(glGetUniformLocation(shader_program,"textureSampler"), 0); // GL_TEXTURE0
uniform_color_id = glGetUniformLocation(shader_program,"color");
glUniform4f(uniform_color_id, 1, 1, 1, 1);
cached_color = -1;
glUseProgram(0);
}
RasterFont::~RasterFont()
@ -162,12 +202,11 @@ RasterFont::~RasterFont()
glDeleteTextures(1, &texture);
glDeleteBuffers(1, &VBO);
glDeleteVertexArrays(1, &VAO);
glDeleteProgram(shader_program);
}
void RasterFont::printMultilineText(const char *text, double start_x, double start_y, double z, int bbWidth, int bbHeight, u32 color)
{
if(!(color & 0xffffff)) return; // color are not supported atm, so do not draw black shadows
int length = (int)strlen(text);
if (!length)
return; // nothing to do
@ -240,10 +279,20 @@ void RasterFont::printMultilineText(const char *text, double start_x, double sta
// no printable char, so also nothing to do
if(!usage) return;
glUseProgram(shader_program);
if(color != cached_color) {
glUniform4f(uniform_color_id, ((color>>0)&0xff)/255.f,((color>>8)&0xff)/255.f,((color>>16)&0xff)/255.f,((color>>24)&0xff)/255.f);
cached_color = color;
}
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ZERO);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_RECTANGLE, texture);
glEnable(GL_TEXTURE_RECTANGLE);
glDrawArrays(GL_TRIANGLES, 0, usage/4);
glUseProgram(0);
}

3
Source/Plugins/Plugin_VideoOGL/Src/RasterFont.h
View File

@ -30,6 +30,9 @@ private:
u32 VBO;
u32 VAO;
u32 texture;
u32 shader_program;
u32 uniform_color_id;
u32 cached_color;
};
#endif // _RASTERFONT_H_