axmol/extensions/Particle3D/CCParticle3DRender.h

/****************************************************************************
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axis-project.github.io/

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#pragma once

#include <vector>

#include "renderer/CCRenderState.h"
#include "renderer/backend/Types.h"
#include "renderer/CCMeshCommand.h"
#include "renderer/CCCallbackCommand.h"
#include "renderer/backend/Buffer.h"
#include "base/CCRef.h"
#include "math/CCMath.h"
#include "ExtensionExport.h"

NS_AX_BEGIN

class ParticleSystem3D;
class Renderer;
class MeshCommand;
class MeshRenderer;
class GLProgramState;
class IndexBuffer;
class VertexBuffer;
class Texture2D;

/**
 * 3d particle render
 */
class CC_EX_DLL Particle3DRender : public Ref
{
    friend class ParticleSystem3D;

public:
    virtual void render(Renderer* renderer, const Mat4& transform, ParticleSystem3D* particleSystem) = 0;

    /** Perform activities when a Renderer is started.
     */
    virtual void notifyStart();
    /** Perform activities when a Renderer is stopped.
     */
    virtual void notifyStop();
    /** Notify that the Particle System is rescaled.
     */
    virtual void notifyRescaled(const Vec3& scale);

    void setVisible(bool isVisible) { _isVisible = isVisible; }

    bool isVisible() const { return _isVisible; }

    void setDepthTest(bool isDepthTest);
    void setDepthWrite(bool isDepthWrite);
    void setBlendFunc(const BlendFunc& blendFunc);

    void copyAttributesTo(Particle3DRender* render);

    virtual void reset() {}

    Particle3DRender();
    virtual ~Particle3DRender();

protected:
    ParticleSystem3D* _particleSystem;
    RenderState::StateBlock _stateBlock;
    bool _isVisible;
    Vec3 _rendererScale;
    bool _depthTest;
    bool _depthWrite;
};

// particle render for quad
class CC_EX_DLL Particle3DQuadRender : public Particle3DRender
{
public:
    static Particle3DQuadRender* create(std::string_view texFile = "");

    virtual void render(Renderer* renderer, const Mat4& transform, ParticleSystem3D* particleSystem) override;

    virtual void reset() override;
    Particle3DQuadRender();
    virtual ~Particle3DQuadRender();

protected:
    bool initQuadRender(std::string_view texFile);

    void onBeforeDraw();
    void onAfterDraw();

protected:
    MeshCommand _meshCommand;
    //CallbackCommand _beforeCommand;
    //CallbackCommand _afterCommand;
    Texture2D* _texture                  = nullptr;
    backend::ProgramState* _programState = nullptr;
    backend::Buffer* _indexBuffer        = nullptr;  // index buffer
    backend::Buffer* _vertexBuffer       = nullptr;  // vertex buffer

    struct posuvcolor
    {
        Vec3 position;
        Vec2 uv;
        Vec4 color;
    };

    std::vector<posuvcolor> _posuvcolors;  // vertex data
    std::vector<uint16_t> _indexData;      // index data
    std::string _texFile;

    backend::UniformLocation _locColor;
    backend::UniformLocation _locTexture;
    backend::UniformLocation _locPMatrix;

    // renderer state cache variables
    bool _rendererDepthTestEnabled                 = true;
    backend::CompareFunction _rendererDepthCmpFunc = backend::CompareFunction::LESS;
    backend::CullMode _rendererCullMode            = backend::CullMode::BACK;
    backend::Winding _rendererWinding              = backend::Winding::COUNTER_CLOCK_WISE;
    bool _rendererDepthWrite                       = false;
};

// particle renderer using MeshRenderer
class CC_EX_DLL Particle3DModelRender : public Particle3DRender
{
public:
    static Particle3DModelRender* create(std::string_view modelFile, std::string_view texFile = "");

    virtual void render(Renderer* renderer, const Mat4& transform, ParticleSystem3D* particleSystem) override;

    virtual void reset() override;
    Particle3DModelRender();
    virtual ~Particle3DModelRender();

protected:
    std::vector<MeshRenderer*> _meshList;
    std::string _modelFile;
    std::string _texFile;
    Vec3 _meshSize;
};

NS_AX_END