shader.hpp

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#pragma once
#include <iostream>
#include <fstream>
#include <sstream>
#include "../engine/exception.hpp"
 
#define CANGINE_DEFAULT_VERT_SRC R"(#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec4 aColor;
layout (location = 2) in vec2 uv;
out vec4 ColorOut;
out vec2 vUv;
void main()
{
    gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
    ColorOut = aColor;
    vUv = uv;
}
)"
 
#define CANGINE_DEFAULT_FRAG_SRC R"(#version 330 core
out vec4 FragColor;
in vec4 ColorOut;
in vec2 vUv;
uniform sampler2D uTexture;
uniform bool uUseTexture;
uniform bool uMono;
void main()
{
    if (uUseTexture)
    {
        if (uMono)
        {
            float alpha = texture(uTexture, vUv).r;
            FragColor = vec4(ColorOut.rgb, alpha * ColorOut.a);
        }
        else
        {
            vec4 t = texture(uTexture, vUv) * ColorOut;
            FragColor = t;
        }
    }
    else
    {
        FragColor = ColorOut;
    }
}
)"
 
// "
// ^ to fix ide coloring issues
 
namespace cangine {
 
    class Shader {
    private:
        unsigned int vs; 
        unsigned int fs; 
 
        struct SourceTag {};
 
        void attach();
        void cleanUp();
        void compileShaders();
        void compileFromSource(const std::string& vsSrc, const std::string& fsSrc);
 
        Shader(const std::string& vsSrc, const std::string& fsSrc, SourceTag);
 
    public:
        std::string shaderPath; 
 
        bool valid = true;   
        unsigned int ID;     
        std::string name;    
 
        void use();
        void unbind();
        void setBool(const std::string& name, bool value);
        void setInt(const std::string& name, int value);
        void setFloat(const std::string& name, float value);
        void setVec2(const std::string& name, float x, float y);
        void setVec3(const std::string& name, float x, float y, float z);
        void setVec4(const std::string& name, float x, float y, float z, float w);
        Shader(std::string name, std::string shaderPath = "./shaders");
        ~Shader();
 
        static Shader* fromSource(const std::string& vsSrc, const std::string& fsSrc);
    };
}