commandBuffer.h

//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HD_ST_COMMAND_BUFFER_H
#define PXR_IMAGING_HD_ST_COMMAND_BUFFER_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdSt/api.h"
#include "pxr/imaging/hd/version.h"
#include "pxr/imaging/hdSt/drawItemInstance.h"
 
#include "pxr/base/gf/matrix4d.h"
 
#include <memory>
#include <vector>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class HdRenderIndex;
class HdStDrawItem;
class HdStDrawItemInstance;
class Hgi;
class HgiGraphicsCmds;
 
using HdStRenderPassStateSharedPtr = std::shared_ptr<class HdStRenderPassState>;
using HdStResourceRegistrySharedPtr = 
        std::shared_ptr<class HdStResourceRegistry>;
 
using HdDrawItemConstPtrVector = std::vector<class HdDrawItem const*>;
using HdDrawItemConstPtrVectorSharedPtr
    = std::shared_ptr<HdDrawItemConstPtrVector>;
 
using HdSt_DrawBatchSharedPtr = std::shared_ptr<class HdSt_DrawBatch>;
using HdSt_DrawBatchSharedPtrVector = std::vector<HdSt_DrawBatchSharedPtr>;
 
class HdStCommandBuffer {
public:
    HDST_API
    HdStCommandBuffer();
    HDST_API
    ~HdStCommandBuffer();
 
    HDST_API
    void PrepareDraw(HgiGraphicsCmds *gfxCmds,
                     HdStRenderPassStateSharedPtr const &renderPassState,
                     HdRenderIndex *renderIndex);
 
    HDST_API
    void ExecuteDraw(HgiGraphicsCmds *gfxCmds,
                     HdStRenderPassStateSharedPtr const &renderPassState,
                     HdStResourceRegistrySharedPtr const &resourceRegistry);
 
    HDST_API
    void SyncDrawItemVisibility(unsigned visChangeCount);
 
    HDST_API
    void SetDrawItems(HdDrawItemConstPtrVectorSharedPtr const &drawItems,
                      unsigned currentBatchVersion,
                      Hgi const *hgi);
 
    HDST_API
    void RebuildDrawBatchesIfNeeded(unsigned currentBatchVersion,
                                    Hgi const *hgi);
 
    size_t GetTotalSize() const {
        if (_drawItems) return _drawItems->size();
        return 0;
    }
 
    size_t GetVisibleSize() const { return _visibleSize; }
 
    size_t GetCulledSize() const {
        if (_drawItems) {
            return _drawItems->size() - _visibleSize; 
        }
        return 0;
    }
 
    HDST_API
    void SetEnableTinyPrimCulling(bool tinyPrimCulling);
 
private:
    void _RebuildDrawBatches(Hgi const *hgi);
    
    void _FrustumCullCPU(GfMatrix4d const &cullMatrix);
 
    HdDrawItemConstPtrVectorSharedPtr _drawItems;
    std::vector<HdStDrawItemInstance> _drawItemInstances;
    HdSt_DrawBatchSharedPtrVector _drawBatches;
    size_t _visibleSize;
    unsigned int _visChangeCount;
    unsigned int _drawBatchesVersion;
};
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif //PXR_IMAGING_HD_ST_COMMAND_BUFFER_H