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/*
* https://stackoverflow.com/questions/10868958/what-does-sampler2d-store
* The sampler2D is bound to a texture unit. The glUniform call binds it to texture
* unit zero. The glActiveTexture call is only needed if you are going to use multiple
* texture units (because GL_TEXTURE0 is the default anyway).
*/
static const char* default_tex = "_tex0_";
static const char* base_shader = R"(
#define number float
#define Texture sampler2D
#define Canvas sampler2D
#define Color vec4
#define Texel texture2D
#define extern uniform
#define Vec2 vec2
#define Vec3 vec3
#define Vec4 vec4
#define Number number
#define Image Texture
extern Texture %s;
%s
void main()
{
gl_FragColor = effect(gl_Color, %s, gl_TexCoord[0].xy, gl_FragCoord.xy);
}
)";
static const int SHADER_FORMAT_SIZE = strlen(base_shader) + strlen(default_tex) * 2;
#define formatShader(buf, program)\
sprintf(buf, base_shader, default_tex, program, default_tex)
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