CShaderManager.h

/*
!@
MIT License
 
Copyright (c) 2019 Skylicht Technology CO., LTD
 
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify,
merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
This file is part of the "Skylicht Engine".
https://github.com/skylicht-lab/skylicht-engine
!#
*/
 
#pragma once
 
#include "pch.h"
#include "Utils/CSingleton.h"
 
#include <functional>
 
namespace Skylicht
{
 
    class CShader;
    class IShaderCallback;
    class IShaderInstancing;

    class SKYLICHT_API CShaderManager   {
    public:
        DECLARE_SINGLETON(CShaderManager)
 
    protected:

        IMeshBuffer* m_currentMeshBuffer;

        SMaterial* m_currentMatRendering;

        std::vector<CShader*> m_listShader;

        std::map<std::string, int> m_listShaderID;
 
    public:
        // Uniform storage for current draw command (used by shaders)

        core::vector2df ShaderVec2[10];

        core::vector3df ShaderVec3[10];

        video::SVec4 ShaderVec4[10];

        f32* BoneMatrix;

        u32 BoneCount;

        float LightmapIndex;

        std::function<IShaderInstancing* (const char*)> OnCreateInstancingVertex;
 
    public:
        CShaderManager();

        virtual ~CShaderManager();

        void releaseAll();

        inline void setCurrentMeshBuffer(IMeshBuffer* buffer)
        {
            m_currentMeshBuffer = buffer;
        }

        inline IMeshBuffer* getCurrentMeshBuffer()
        {
            return m_currentMeshBuffer;
        }

        inline void setCurrentMaterial(SMaterial& mat)
        {
            m_currentMatRendering = &mat;
        }

        inline SMaterial* getCurrentMaterial()
        {
            return m_currentMatRendering;
        }

        void initGUIShader();

        void initBasicShader();

        void initSGDeferredShader();

        void initSGForwarderShader();

        void initMobileSGShader();

        void initPBRForwarderShader();

        void initSkylichtEngineShader();

        void initShader();

        CShader* loadShader(const char* shaderConfig);

        bool rebuildShader(CShader* shader);

        int getShaderIDByName(const char* name);

        CShader* getShaderByName(const char* name);

        CShader* getShaderByPath(const char* path);

        CShader* getShaderByID(int id);

        std::string getShaderFileName(const char* fileName);

        inline int getNumShader()
        {
            return (int)m_listShader.size();
        }

        CShader* getShader(int i)
        {
            return m_listShader[i];
        }
 
    protected:

        bool buildShader(CShader* shader, io::IXMLReader* xmlReader, const char* source, const char* shaderFolder, bool rebuild);
    };
 
}