ShaderProgramManager.hpp

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#pragma once
 
#include <glad/glad.h>
#include <GLFW/glfw3.h>
 
#include <map>
#include <string>
#include <utility>
#include <vector>
 
#include <cstdint>
 
enum class ShaderType : std::uint32_t {
    vertex = GL_VERTEX_SHADER,
    tess_eval = GL_TESS_EVALUATION_SHADER,
    tess_ctrl = GL_TESS_CONTROL_SHADER,
    geometry = GL_GEOMETRY_SHADER,
    fragment = GL_FRAGMENT_SHADER,
    compute = GL_COMPUTE_SHADER
};
 
class ShaderProgramManager
{
public:
    using ProgramData = std::map<ShaderType, std::string>;
    struct SelectedProgram {
        bool was_selection_changed = false;
        GLuint const* program = nullptr;
        char const* name = nullptr;
    };
    ~ShaderProgramManager();
    void CreateAndRegisterProgram(char const* const program_name, ProgramData const& program_data, GLuint& program);
    void CreateAndRegisterComputeProgram(char const* const program_name, std::string const& filename, GLuint& program);
    bool ReloadAllPrograms();
    SelectedProgram SelectProgram(std::string const& label, std::int32_t& program_index);
 
private:
    void ProcessProgram(std::size_t program_index);
    using ProgramEntry = std::pair<GLuint&, ProgramData>;
    std::vector<ProgramEntry> program_entries;
    std::vector<char const*> program_names;
};