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OpenGL: Add simple desaturation filter to default shader

This commit is contained in:
Jeffrey Pfau 2016-01-16 02:08:11 -08:00
parent c83e4e7e85
commit 7cf067ac14
1 changed files with 17 additions and 2 deletions
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19
src/platform/opengl/gles2.c
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@ -35,12 +35,15 @@ static const char* const _fragmentShader =
"varying vec2 texCoord;\n"
"uniform sampler2D tex;\n"
"uniform float gamma;\n"
"uniform vec3 desaturation;\n"
"uniform vec3 scale;\n"
"uniform vec3 bias;\n"
"void main() {\n"
" vec4 color = texture2D(tex, texCoord);\n"
" color.a = 1.;\n"
" float average = dot(color.rgb, vec3(1.)) / 3.;\n"
" color.rgb = vec3(average) * desaturation + color.rgb * (vec3(1.) - desaturation);\n"
" color.rgb = scale * pow(color.rgb, vec3(gamma, gamma, gamma)) + bias;\n"
" gl_FragColor = color;\n"
"}";
@ -82,7 +85,7 @@ static void GBAGLES2ContextInit(struct VideoBackend* v, WHandle handle) {
glClearColor(0.f, 0.f, 0.f, 1.f);
struct GBAGLES2Uniform* uniforms = malloc(sizeof(struct GBAGLES2Uniform) * 3);
struct GBAGLES2Uniform* uniforms = malloc(sizeof(struct GBAGLES2Uniform) * 4);
uniforms[0].name = "gamma";
uniforms[0].readableName = "Gamma";
uniforms[0].type = GL_FLOAT;
@ -113,7 +116,19 @@ static void GBAGLES2ContextInit(struct VideoBackend* v, WHandle handle) {
uniforms[2].max.fvec3[0] = 1.0f;
uniforms[2].max.fvec3[1] = 1.0f;
uniforms[2].max.fvec3[2] = 1.0f;
GBAGLES2ShaderInit(&context->initialShader, _vertexShader, _fragmentShader, -1, -1, uniforms, 3);
uniforms[3].name = "desaturation";
uniforms[3].readableName = "Desaturation";
uniforms[3].type = GL_FLOAT_VEC3;
uniforms[3].value.fvec3[0] = 0.0f;
uniforms[3].value.fvec3[1] = 0.0f;
uniforms[3].value.fvec3[2] = 0.0f;
uniforms[3].min.fvec3[0] = 0.0f;
uniforms[3].min.fvec3[1] = 0.0f;
uniforms[3].min.fvec3[2] = 0.0f;
uniforms[3].max.fvec3[0] = 1.0f;
uniforms[3].max.fvec3[1] = 1.0f;
uniforms[3].max.fvec3[2] = 1.0f;
GBAGLES2ShaderInit(&context->initialShader, _vertexShader, _fragmentShader, -1, -1, uniforms, 4);
GBAGLES2ShaderInit(&context->finalShader, 0, 0, 0, 0, 0, 0);
glDeleteFramebuffers(1, &context->finalShader.fbo);
context->finalShader.fbo = 0;