genesis-3d_engine/Engine/rendersystem/base/BufferData.cc

/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
http://www.genesis-3d.com.cn

Permission is hereby granted, free of charge, to any person obtaining a copy
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****************************************************************************/

#include "stdneb.h"
#ifdef __OSX__
#include "../rendersystem/base/BufferData.h"
#include "memory/memory.h"
#else
#include "rendersystem/base/BufferData.h"
#include "foundation/memory/memory.h"
#endif
namespace RenderBase
{
	void _copyVertexData(const VertexStream& from, void* to, int vertexByteSize, int vertexCount)
	{

		//小单位的拷贝中，等号赋值比调用内存拷贝函数要快很多很多。
		//叫xmemcpy的一个工具就是这么干的，号称小于120字节以内的拷贝比gcc的内存拷贝快10倍。
		//等号赋值长度必须<=128字节，并且是机器字长的倍数

		//在渲染系统中，顶点的数据的最小单位是4byte, 即一个int32的大小
		n_assert(vertexByteSize > 0);
		n_assert(NULL != from.data);
		n_assert(NULL != to);
		n_assert((from.elemSizeInByte % 4) == 0);
		n_assert((vertexByteSize % 4) == 0);

		int data_stride4 = from.elemSizeInByte / 4;
		int vertex_stride4 = vertexByteSize / 4;
		const uint32* buffer32 = (const uint32*)(from.data);
		uint32* dest = (uint32*)(((uint8*)to) + from.offsetInByte);

		switch(data_stride4)
		{
		case 1:
			{		
				while(vertexCount--)
				{
#if __OSX__
					Memory::CopySmallOne((size_t*)buffer32, (size_t*)dest);
#else
					Memory::CopySmallOne(buffer32, dest);
#endif
					++buffer32;
					dest += vertex_stride4;
				}
				break;
			}
		case 2:
			{
				while(vertexCount--)
				{
#if __OSX__
					Memory::CopySmallTwo((size_t*)buffer32, (size_t*)dest);
#else
					Memory::CopySmallTwo(buffer32, dest);
#endif

					buffer32 += 2;
					dest += vertex_stride4;
				}
				break;
			}
		case 3:
			{
				while(vertexCount--)
				{
#if __OSX__
					Memory::CopySmallThree((size_t*)buffer32, (size_t*)dest);
#else
					Memory::CopySmallThree(buffer32, dest);
#endif

					buffer32 += 3;
					dest += vertex_stride4;
				}
				break;
			}
		case 4:
			{
				while(vertexCount--)
				{
#if __OSX__
					Memory::CopySmallFour((size_t*)buffer32, (size_t*)dest);
#else
					Memory::CopySmallFour(buffer32, dest);
#endif
					buffer32 += 4;
					dest += vertex_stride4;
				}
				break;
			}
		case 5:
			{
				while(vertexCount--)
				{
#if __OSX__
					Memory::CopySmallFive((size_t*)buffer32, (size_t*)dest);
#else
					Memory::CopySmallFive(buffer32, dest);
#endif

					buffer32 += 5;
					dest += vertex_stride4;
				}
				break;
			}
		case 6://VertexComponent::SkinJIndices和VertexComponent::SkinWeights是合在一起的，所以会有6的情况。
			{
				while(vertexCount--)
				{
#if __OSX__
					Memory::CopySmallSix((size_t*)buffer32, (size_t*)dest);
#else
					Memory::CopySmallSix(buffer32, dest);
#endif

					buffer32 += 6;
					dest += vertex_stride4;
				}
				break;
			}
		default:
			n_error("error vertex data size");//只有以上的那几种大小
			break;
		}

	}

	void DirectCopyVertexDataToGraphicBuffer(const VertexBufferData& source, void* to, int vertexByteSize)
	{
		const VertexStreams& dataStreams = source.vertex.vertexComponentStreams;
		if (source.vertex.vertexComponentStreams.Size() == 1
			&& source.vertex.vertexComponentStreams[0].elemSizeInByte == vertexByteSize
			&& source.vertex.vertexComponentStreams[0].data)
		{
			Memory::Copy(dataStreams[0].data,to, vertexByteSize * source.vertexCount);
		}
		else
		{
			for (int i = 0; i < dataStreams.Size(); ++i)
			{
				VertexStream stream = dataStreams[i];
				if (stream.data)
				{
					_copyVertexData(stream, to, vertexByteSize, source.vertexCount);
				}
			}
		}

	}

	int IndexBufferData::SizeOf(IndexType type)
	{
		switch(type)
		{
		case Int16:
			return 2;
		case Int32:
			return 4;
		default:
			return 0;
		}
	}
}