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77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
// SPDX-License-Identifier: MIT
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//
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// EmulationStation Desktop Edition
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// Shader_GL21.h
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//
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// OpenGL 2.1 GLSL shader functions.
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//
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#ifndef ES_CORE_RENDERER_SHADER_GL21_H
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#define ES_CORE_RENDERER_SHADER_GL21_H
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#define GL_GLEXT_PROTOTYPES
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#include "math/Transform4x4f.h"
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#if defined(_WIN64)
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#include <GL/glew.h>
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#endif
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#include <SDL2/SDL.h>
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#include <SDL2/SDL_opengl.h>
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#include <array>
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#include <string>
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#include <vector>
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namespace Renderer
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{
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class Shader
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{
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public:
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Shader();
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~Shader();
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// Loads the shader source code only, no compilation done at this point.
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void loadShaderFile(const std::string& path, GLenum shaderType);
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// Compilation, shader attachment and linking.
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bool createProgram();
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// Only used for a clean shutdown.
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void deleteProgram(GLuint programID);
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// Get references to the variables inside the compiled shaders.
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void getVariableLocations(GLuint programID);
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// One-way communication with the compiled shaders.
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void setModelViewProjectionMatrix(Transform4x4f mvpMatrix);
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void setTextureSize(std::array<GLfloat, 2> shaderVec2);
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void setTextureCoordinates(std::array<GLfloat, 4> shaderVec4);
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void setColor(std::array<GLfloat, 4> shaderVec4);
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void setSaturation(GLfloat saturation);
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void setOpacity(GLfloat opacity);
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void setDimValue(GLfloat dimValue);
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// Sets the shader program to use the loaded shaders.
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void activateShaders();
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// Sets the shader program to 0 which reverts to the fixed function pipeline.
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void deactivateShaders();
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// Returns the program ID that was generated by glCreateProgram().
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GLuint getProgramID();
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// Only used for error logging if the shaders fail to compile or link.
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void printProgramInfoLog(GLuint programID);
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void printShaderInfoLog(GLuint shaderID, GLenum shaderType);
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private:
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GLuint mProgramID;
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std::vector<std::tuple<std::string, std::string, GLenum>> shaderVector;
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// Variables used for communication with the compiled shaders.
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GLint shaderMVPMatrix;
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GLint shaderTextureSize;
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GLint shaderTextureCoord;
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GLint shaderColor;
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GLint shaderSaturation;
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GLint shaderOpacity;
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GLint shaderDimValue;
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};
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} // Renderer
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#endif // ES_CORE_RENDERER_SHADER_GL21_H
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