glsl_optimizer.h
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#pragma once
#ifndef GLSL_OPTIMIZER_H
#define GLSL_OPTIMIZER_H
/*
Main GLSL optimizer interface.
See ../../README.md for more instructions.
General usage:
ctx = glslopt_initialize();
for (lots of shaders) {
shader = glslopt_optimize (ctx, shaderType, shaderSource, options);
if (glslopt_get_status (shader)) {
newSource = glslopt_get_output (shader);
} else {
errorLog = glslopt_get_log (shader);
}
glslopt_shader_delete (shader);
}
glslopt_cleanup (ctx);
*/
struct glslopt_shader;
struct glslopt_ctx;
enum glslopt_shader_type {
kGlslOptShaderVertex = 0,
kGlslOptShaderFragment,
};
// Options flags for glsl_optimize
enum glslopt_options {
kGlslOptionSkipPreprocessor = (1<<0), // Skip preprocessing shader source. Saves some time if you know you don't need it.
kGlslOptionNotFullShader = (1<<1), // Passed shader is not the full shader source. This makes some optimizations weaker.
};
// Optimizer target language
enum glslopt_target {
kGlslTargetOpenGL = 0,
kGlslTargetOpenGLES20 = 1,
kGlslTargetOpenGLES30 = 2,
kGlslTargetMetal = 3,
};
// Type info
enum glslopt_basic_type {
kGlslTypeFloat = 0,
kGlslTypeInt,
kGlslTypeBool,
kGlslTypeTex2D,
kGlslTypeTex3D,
kGlslTypeTexCube,
kGlslTypeTex2DShadow,
kGlslTypeTex2DArray,
kGlslTypeOther,
kGlslTypeCount
};
enum glslopt_precision {
kGlslPrecHigh = 0,
kGlslPrecMedium,
kGlslPrecLow,
kGlslPrecCount
};
glslopt_ctx* glslopt_initialize (glslopt_target target);
void glslopt_cleanup (glslopt_ctx* ctx);
void glslopt_set_max_unroll_iterations (glslopt_ctx* ctx, unsigned iterations);
glslopt_shader* glslopt_optimize (glslopt_ctx* ctx, glslopt_shader_type type, const char* shaderSource, unsigned options);
bool glslopt_get_status (glslopt_shader* shader);
const char* glslopt_get_output (glslopt_shader* shader);
const char* glslopt_get_raw_output (glslopt_shader* shader);
const char* glslopt_get_log (glslopt_shader* shader);
void glslopt_shader_delete (glslopt_shader* shader);
int glslopt_shader_get_input_count (glslopt_shader* shader);
void glslopt_shader_get_input_desc (glslopt_shader* shader, int index, const char** outName, glslopt_basic_type* outType, glslopt_precision* outPrec, int* outVecSize, int* outMatSize, int* outArraySize, int* outLocation);
int glslopt_shader_get_uniform_count (glslopt_shader* shader);
int glslopt_shader_get_uniform_total_size (glslopt_shader* shader);
void glslopt_shader_get_uniform_desc (glslopt_shader* shader, int index, const char** outName, glslopt_basic_type* outType, glslopt_precision* outPrec, int* outVecSize, int* outMatSize, int* outArraySize, int* outLocation);
int glslopt_shader_get_texture_count (glslopt_shader* shader);
void glslopt_shader_get_texture_desc (glslopt_shader* shader, int index, const char** outName, glslopt_basic_type* outType, glslopt_precision* outPrec, int* outVecSize, int* outMatSize, int* outArraySize, int* outLocation);
// Get *very* approximate shader stats:
// Number of math, texture and flow control instructions.
void glslopt_shader_get_stats (glslopt_shader* shader, int* approxMath, int* approxTex, int* approxFlow);
#endif /* GLSL_OPTIMIZER_H */