ShaderStorageBuffer.h

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//    Copyright 2004-2019, SenseGraphics AB
//
//    This file is part of H3D API.
//
//    H3D API is free software; you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation; either version 2 of the License, or
//    (at your option) any later version.
//
//    H3D API is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with H3D API; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
//    A commercial license is also available. Please contact us at 
//    www.sensegraphics.com for more information.
//
//
//
#ifndef __SHADERSTORAGEBUFFER_H__
#define __SHADERSTORAGEBUFFER_H__
 
#include <H3D/ShaderChildNode.h>
#include <H3D/SFInt32.h>
#include <H3D/SFString.h>
 
namespace H3D {
 
  class H3DAPI_API ShaderStorageBuffer : 
    public ShaderChildNode {
  public:
  
    ShaderStorageBuffer( Inst< DisplayList  > _displayList = 0,
                         Inst< SFNode       >  _metadata = 0,
                         Inst< SFInt32      > _width = 0,
                         Inst< SFInt32      > _height = 0,
                         Inst< SFInt32      > _depth = 0,
                         Inst< SFInt32      > _dataSize = 0,
                         Inst< SFString     > _storageName = 0
                         );
 
 
 
    virtual void preRender( unsigned int program );
 
    virtual void render ( );
 
 
    virtual void prepareStorageBuffer ( );
 
 
    virtual int getStorageBlockBinding ( ){
      return storage_block_binding;
    }
 
    virtual void initialize ( );
 
    ~ShaderStorageBuffer ( );
 
    // width, height and depth is used to set the size
    // of the buffer data. It is actually just one value, as shader storage
    // buffer is used in shader, to separate it into three dimension
    // will make it more intuitive
 
    H3DUniquePtr<SFInt32> width;
 
    H3DUniquePtr<SFInt32> height;
 
    H3DUniquePtr<SFInt32> depth;
 
    H3DUniquePtr<SFInt32> dataSize;
 
    H3DUniquePtr<SFString> storageName;
 
    static H3DNodeDatabase database;
 
  protected:
 
    unsigned int program_handle;
 
    int buffer_id;
 
    unsigned int storage_block_index;
 
    int storage_block_binding;
    
    // collection of all the current storage block binding points already used, 
    // it will be used to help generate non-identical block binding id
    static set<size_t> global_block_bindings;
    static H3DUtil::MutexLock global_block_bindings_lock;
    static size_t max_block_bindings;
    static int generateShaderStorageBinding ( );
    static void deleteShaderStorageBinding ( int binding );
    // maximum ssbo size supported
    H3DUTIL_INT64 max_ssbo_size;
    H3DUniquePtr<Field> rebuildBuffer;
  };
}
 
#endif