shader.h

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/* Conquer Space
 * Copyright (C) 2021-2025 Conquer Space
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#pragma once
 
#include <hjson.h>
 
#include <istream>
#include <memory>
#include <string>
#include <utility>
 
#include <glm/glm.hpp>
 
#include "engine/asset/asset.h"
 
namespace cqsp::asset {
enum class ShaderType {
    NONE,  
    VERT,  
    FRAG,  
    GEOM   
};
 
class Shader : public Asset {
 public:
    Shader() = default;
    Shader(const std::string& code, ShaderType type);
 
    void operator()(const std::string& code, ShaderType type);
    ~Shader();
 
    ShaderType shader_type = ShaderType::NONE;
 
    unsigned int id;
    AssetType GetAssetType() override { return AssetType::SHADER; }
 
 private:
    explicit Shader(const Shader&) = default;
};
 
class ShaderProgram {
 public:
    ShaderProgram();
    ShaderProgram(const Shader& vert, const Shader& frag);
    ShaderProgram(const Shader& vert, const Shader& frag, const Shader& geom);
    ~ShaderProgram();
 
    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, const glm::vec2& value);
    void setVec2(const std::string& name, float x, float y);
    void setVec3(const std::string& name, const glm::vec3& value);
    void setVec3(const std::string& name, float x, float y, float z);
    void setVec4(const std::string& name, const glm::vec4& value);
    void setVec4(const std::string& name, float x, float y, float z, float w);
    void setMat2(const std::string& name, const glm::mat2& mat);
    void setMat3(const std::string& name, const glm::mat3& mat);
    void setMat4(const std::string& name, const glm::mat4& mat);
    void bindTexture(int texture, unsigned int texture_id);
 
    // Simpler overloaded functions so that you can just say set xxx and change the type
    // as and when you like.
    void Set(const std::string& name, bool value);
    void Set(const std::string& name, int value);
    void Set(const std::string& name, float value);
    void Set(const std::string& name, const glm::vec2& value);
    void Set(const std::string& name, float x, float y);
    void Set(const std::string& name, const glm::vec3& value);
    void Set(const std::string& name, float x, float y, float z);
    void Set(const std::string& name, const glm::vec4& value);
    void Set(const std::string& name, float x, float y, float z, float w);
    void Set(const std::string& name, const glm::mat2& mat);
    void Set(const std::string& name, const glm::mat3& mat);
    void Set(const std::string& name, const glm::mat4& mat);
 
    void UseProgram();
    unsigned int program;
 
    void SetMVP(const glm::mat4& model, const glm::mat4& view, const glm::mat4& projection);
 
    operator unsigned int() const { return program; }
};
 
typedef std::shared_ptr<ShaderProgram> ShaderProgram_t;
 
inline ShaderProgram_t MakeShaderProgram(Shader& vert, Shader& frag) {
    return std::make_shared<ShaderProgram>(vert, frag);
}
 
inline ShaderProgram_t MakeShaderProgram(Shader& vert, Shader& frag, Shader& geom) {
    return std::make_shared<ShaderProgram>(vert, frag, geom);
}
 
class ShaderDefinition : public Asset {
 public:
    std::string vert;
 
    std::string frag;
 
    std::string geometry;
 
    // All the uniforms
    Hjson::Value uniforms;
 
    ShaderProgram_t MakeShader();
 
    AssetType GetAssetType() override { return AssetType::SHADER_DEFINITION; }
 
 private:
    void SetShaderUniform(ShaderProgram_t& shader, std::pair<const std::string, Hjson::Value>& value);
};
 
// Set of utility functions that load shaders
unsigned int LoadShaderData(const std::string& code, int type);
unsigned int MakeShaderProgram(int vertex, int fragment, int geometry = -1);
 
std::string GetErrorLog(unsigned int shader);
}  // namespace cqsp::asset