add glsl opmizier

Author: minggo

glsl-optimizer/include/glsl_optimizer.h

@@ -0,0 +1,91 @@
+#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 */