86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
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#ifndef _PIUMA_RENDER_SHADER_H_
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#define _PIUMA_RENDER_SHADER_H_
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#include "../lib/types.h"
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#include "GL/glcorearb.h"
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/*
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I put the uniform ids of all the shaders in the r_shader structure. Then I use only the
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ones I need. Yeah, it's not very flexible.
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I would like to have automatic syncronization between shader and C++ code.
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There are 3 ways to do that:
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- Parse shader code and auto-generate C++ structures and code;
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- Parse C++ structures and generate a shader source, or update an existing one;
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- Use a language than let me define shader code directly in that language, then it's compiled
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directly to GPU ASM, or it generates GLSL code that is then given to the GPU driver. This is
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the ideal solution, but yeah, that language is not C++... if it event exists. Let's hope for
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a better future.
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*/
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#define R_SHADER_TEXTURES_MAX 4
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#define R_SHADER_COLOR_MAX 4
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struct r_shader
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{
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GLuint id;
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// Common state
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GLint time;
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GLint width;
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GLint height;
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// View and camera
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GLint view_matrix;
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GLint view_matrix_inverse;
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GLint model_matrix;
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GLint camera_position;
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// For arrays, the name in the shader is in the format [name][index].
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// Example: color[4] will be: color0, color1, color2, color3
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// Generic parameters that can be used for different purpose based on the shader needs.
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// Example: texture1 could be a diffuse texture, texture2 an emissive texture, texture3 bump mapping
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GLint color[R_SHADER_COLOR_MAX];
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GLint has_texture [R_SHADER_TEXTURES_MAX]; // Is textureX assigned or not?
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GLint texture [R_SHADER_TEXTURES_MAX]; // Actual texture
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GLint texture_channels[R_SHADER_TEXTURES_MAX]; // Number of channels in the texture data
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// Lights and shadows
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// @Cleanup: maybe merge this with the generic texture parameter?
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GLint lights;
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GLint has_shadow_map;
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GLint shadow_map;
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GLint shadow_matrix;
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// Environment map
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GLint has_environment_map;
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GLint environment_map;
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// PBR material
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GLint has_albedo_texture;
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GLint albedo_texture;
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GLint albedo_factor;
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GLint has_metallic_texture;
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GLint metallic_texture;
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GLint metallic_factor;
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GLint has_roughness_texture;
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GLint roughness_texture;
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GLint roughness_factor;
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GLint has_normal_texture;
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GLint normal_texture;
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GLint has_emissive_texture;
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GLint emissive_texture;
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GLint emissive_factor;
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};
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bool r_shader_from_files(r_shader *shader, const char *vertex, const char *fragment, const char *geometry = NULL, const char *tesseletion_control = NULL, const char *tesseletion_evaluation = NULL, const char *compute = NULL);
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bool r_shader_from_text(r_shader *shader, const char *vertex, const char *fragment, const char *geometry = NULL, const char *tesseletion_control = NULL, const char *tesseletion_evaluation = NULL, const char *compute = NULL);
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void r_shader_delete(r_shader *shader);
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#endif
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