ShaderLoader.cpp

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/**
* @file ShaderLoader.cpp.
* @brief The ShaderLoader Class Implementation.
* @author Spices.
*/
 
#include "Pchheader.h"
#include "ShaderLoader.h"
#include "Systems/ResourceSystem.h"
#include "Core/Library/FileLibrary.h"
#include "Resources/Shader/Shader.h"
#include "Resources/Shader/ShaderCompiler.h"
#include "Render/Vulkan/VulkanRenderBackend.h"
#include "Render/Vulkan/VulkanShaderModule.h"
#include "shaderc/shaderc.hpp"
 
namespace Spices {
 
    /**
    * @brief Const variable: Original Shader File Path.
    */
    const std::string defaultShaderPath = "Shaders/src/";
 
    bool ShaderLoader::Load(const std::string& fileName, ShaderStage stage, Shader* outShader)
    {
        SPICES_PROFILE_ZONE;
 
        bool isFind = false;
        std::string filePath;
        for (auto& it : ResourceSystem::GetSearchFolder())
        {
            filePath = it + defaultShaderPath + "Shader." + fileName + "." + ShaderHelper::ToString(stage);
            if (FileLibrary::FileLibrary_Exists(filePath.c_str()))
            {
                isFind = true;
                break;
            }
        }
        if (!isFind)
        {
            std::stringstream ss;
            ss << "Shader: " << fileName << "file is not found";
 
            SPICES_CORE_WARN(ss.str());
 
            return false;
        }
 
        /**
        * @brief Read file as bytes.
        */
        std::ifstream stream(filePath);
        std::stringstream strStream;
        strStream << stream.rdbuf();
 
        /**
        * @brief Compile to spv.
        */
        std::vector<uint8_t> spirv;
        ShaderCompiler::CompileToSPV(strStream.str(), stage, fileName, spirv);
 
        /**
        * @brief Create shader module.
        */
        outShader->m_ShaderModule = std::make_shared<VulkanShaderModule>(VulkanRenderBackend::GetState(), fileName, stage, spirv, filePath);
 
        return true;
    }
}