ParticleEmitter.h

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/*
   Copyright (c) 2018 DIVIDE-Studio
   Copyright (c) 2009 Ionut Cava
 
   This file is part of DIVIDE Framework.
 
   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.
 
 */
 
#pragma once
#ifndef DVD_PARTICLE_EMITTER_H_
#define DVD_PARTICLE_EMITTER_H_
 
#include "ParticleSource.h"
#include "ParticleUpdater.h"
#include "Graphs/Headers/SceneNode.h"
 
namespace Divide {
 
class Texture;
FWD_DECLARE_MANAGED_CLASS(GenericVertexData);
 
DEFINE_NODE_TYPE( ParticleEmitter, SceneNodeType::TYPE_PARTICLE_EMITTER )
{
   public:
    explicit ParticleEmitter( const ResourceDescriptor<ParticleEmitter>& descriptor );
    ~ParticleEmitter() override;
 
    void prepareRender(SceneGraphNode* sgn,
                       RenderingComponent& rComp,
                       RenderPackage& pkg,
                       GFX::MemoryBarrierCommand& postDrawMemCmd,
                       RenderStagePass renderStagePass,
                       const CameraSnapshot& cameraSnapshot,
                       bool refreshData) override;
 
 
    void enableEmitter(const bool state) noexcept { _enabled = state; }
 
    void setDrawImpostor(const bool state) noexcept { _drawImpostor = state; }
 
    [[nodiscard]] bool initData(const std::shared_ptr<ParticleData>& particleData);
 
    bool load( PlatformContext& context ) override;
    bool unload() override;
 
    void addUpdater(const std::shared_ptr<ParticleUpdater>& updater) {
        _updaters.push_back(updater);
    }
 
    void addSource(const std::shared_ptr<ParticleSource>& source) {
        _sources.push_back(source);
    }
 
    [[nodiscard]] U32 getAliveParticleCount() const noexcept;
 
   protected:
 
    void sceneUpdate(U64 deltaTimeUS,
                     SceneGraphNode* sgn,
                     SceneState& sceneState) override;
 
    void buildDrawCommands(SceneGraphNode* sgn, GenericDrawCommandContainer& cmdsOut) override;
 
    [[nodiscard]] GenericVertexData& getDataBuffer(RenderStage stage, PlayerIndex idx);
 
   private:
    static constexpr U8 s_MaxPlayerBuffers = 4;
 
    std::shared_ptr<ParticleData> _particles;
 
    vector<std::shared_ptr<ParticleSource>> _sources;
    vector<std::shared_ptr<ParticleUpdater>> _updaters;
 
    bool _enabled = false;
    bool _drawImpostor = false;
 
    using BuffersPerStage = std::array<GenericVertexData_ptr, to_base(RenderStage::COUNT)>;
    using BuffersPerPlayer = std::array<BuffersPerStage, s_MaxPlayerBuffers>;
    BuffersPerPlayer _particleGPUBuffers{};
    std::array<bool, to_base(RenderStage::COUNT)> _buffersDirty{};
 
    Task* _bufferUpdate = nullptr;
    Task* _bbUpdate = nullptr;
};
 
TYPEDEF_SMART_POINTERS_FOR_TYPE(ParticleEmitter);
 
}  // namespace Divide
 
#endif //DVD_PARTICLE_EMITTER_H_