From 15740faf9fe9fe4be08965098bbf2947e096aeeb Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Wed, 14 Aug 2019 22:50:43 +0800
Subject: +Unity Runtime code

---
 Runtime/Filters/Mesh/VertexData.cpp | 559 ++++++++++++++++++++++++++++++++++++
 1 file changed, 559 insertions(+)
 create mode 100644 Runtime/Filters/Mesh/VertexData.cpp

(limited to 'Runtime/Filters/Mesh/VertexData.cpp')

diff --git a/Runtime/Filters/Mesh/VertexData.cpp b/Runtime/Filters/Mesh/VertexData.cpp
new file mode 100644
index 0000000..b922805
--- /dev/null
+++ b/Runtime/Filters/Mesh/VertexData.cpp
@@ -0,0 +1,559 @@
+#include "UnityPrefix.h"
+#include "Configuration/UnityConfigure.h"
+#include "VertexData.h"
+#include "Runtime/Shaders/VBO.h"
+#include "Runtime/Serialize/TransferFunctions/SerializeTransfer.h"
+#include "Runtime/Serialize/TransferUtility.h"
+#include "Runtime/Serialize/SwapEndianArray.h"
+#include <algorithm>
+
+/*
+	On most platforms, for skinning/non-uniform-scaling of meshes you would want to split your data into 
+	a hot data stream (position, normal and tangent) and a cold data stream (diffuse and uvs) in order to maximize CPU cache access patterns and 
+	reduce bandwidth and computation ( you won't need to copy the cold data )
+*/
+
+VertexStreamsLayout VertexDataInfo::kVertexStreamsDefault = {{ kShaderChannelsAll, 0, 0, 0 }};
+#if UNITY_PS3
+	VertexStreamsLayout VertexDataInfo::kVertexStreamsSkinnedHotColdSplit = {{ VERTEX_FORMAT1(Vertex), VERTEX_FORMAT1(Normal), VERTEX_FORMAT1(Tangent), kShaderChannelsCold }};
+#else
+	VertexStreamsLayout VertexDataInfo::kVertexStreamsSkinnedHotColdSplit = {{ kShaderChannelsHot, kShaderChannelsCold, 0, 0 }};
+#	if UNITY_EDITOR
+		VertexStreamsLayout VertexDataInfo::kVertexStreamsSkinnedHotColdSplitPS3 = {{ VERTEX_FORMAT1(Vertex), VERTEX_FORMAT1(Normal), VERTEX_FORMAT1(Tangent), kShaderChannelsCold }};
+#	endif
+#endif
+
+#define MAKE_CHANNEL(fmt, dim) VertexChannelsLayout::Channel(kChannelFormat##fmt, dim)
+VertexChannelsLayout VertexDataInfo::kVertexChannelsDefault =
+{{	// Array wrapped by struct requires double braces
+	MAKE_CHANNEL(Float, 3),		// position
+	MAKE_CHANNEL(Float, 3),		// normal
+	MAKE_CHANNEL(Color, 1),		// color
+	MAKE_CHANNEL(Float, 2),		// texcoord0
+	MAKE_CHANNEL(Float, 2),		// texcoord1
+	MAKE_CHANNEL(Float, 4)		// tangent
+}};
+VertexChannelsLayout VertexDataInfo::kVertexChannelsCompressed =
+{{	// Array wrapped by struct requires double braces
+	MAKE_CHANNEL(Float,   3),	// position
+	MAKE_CHANNEL(Float16, 4),	// normal
+	MAKE_CHANNEL(Color,   1),	// color
+	MAKE_CHANNEL(Float16, 2),	// texcoord0
+	MAKE_CHANNEL(Float16, 2),	// texcoord1
+	MAKE_CHANNEL(Float16, 4)	// tangent
+}};
+VertexChannelsLayout VertexDataInfo::kVertexChannelsCompressedAggressive =
+{{  // Array wrapped by struct requires double braces
+    MAKE_CHANNEL(Float,   3),   // position
+    MAKE_CHANNEL(Byte,    4),   // normal
+    MAKE_CHANNEL(Color,   1),   // color
+    MAKE_CHANNEL(Float16, 2),   // texcoord0
+    MAKE_CHANNEL(Float16, 2),   // texcoord1
+    MAKE_CHANNEL(Byte,    4)    // tangent
+}};
+#undef MAKE_CHANNEL
+
+static const UInt8 kVertexChannelFormatSizes[kChannelFormatCount] = {
+    4,  // kChannelFormatFloat
+    2,  // kChannelFormatFloat16
+    4,  // kChannelFormatColor
+    1   // kChannelFormatByte
+};
+
+size_t GetChannelFormatSize(UInt8 format)
+{
+	Assert (format < kChannelFormatCount);
+    return kVertexChannelFormatSizes[format];
+}
+
+static bool operator == (const VertexStreamsLayout& lhs, const VertexStreamsLayout& rhs)
+{
+	return CompareArrays(lhs.channelMasks, rhs.channelMasks, kMaxVertexStreams);
+}
+
+template<class TransferFunction>
+void VertexData::Transfer (TransferFunction& transfer)
+{
+	#if SUPPORT_SERIALIZED_TYPETREES
+	if (transfer.GetFlags() & kWorkaround35MeshSerializationFuckup)
+	{
+		TransferWorkaround35SerializationFuckup (transfer);
+		return;
+	}
+	#endif
+
+	transfer.Transfer (m_CurrentChannels, "m_CurrentChannels", kHideInEditorMask);
+	transfer.Transfer (m_VertexCount, "m_VertexCount", kHideInEditorMask);
+
+	dynamic_array<ChannelInfo> channels;
+	dynamic_array<StreamInfo> streams;
+	if (transfer.IsWriting ())
+	{
+		channels.resize_uninitialized (kShaderChannelCount);
+		streams.resize_uninitialized (kMaxVertexStreams);
+		std::copy (m_Channels, m_Channels + kShaderChannelCount, channels.begin ());
+		std::copy (m_Streams, m_Streams + kMaxVertexStreams, streams.begin ());
+	}
+	transfer.Transfer (channels, "m_Channels", kHideInEditorMask);
+	transfer.Transfer (streams, "m_Streams", kHideInEditorMask);
+	
+	if (transfer.IsReading ())
+	{
+		// For compatibility do this even if channels/streams info didn't exist (case 558604)
+		// In the past there was only a channels mask, UpdateStreams() generates the info from that
+		if (channels.size () == kShaderChannelCount)
+			std::copy (channels.begin (), channels.begin () + kShaderChannelCount, m_Channels);
+		if (streams.size () == kMaxVertexStreams)
+			std::copy (streams.begin (), streams.begin () + kMaxVertexStreams, m_Streams);
+		else
+			std::fill (m_Streams, m_Streams + kMaxVertexStreams, StreamInfo());
+
+		UInt32 channelsInStreams = 0;
+		for (int i = 0; i < kMaxVertexStreams ; i++)
+			channelsInStreams |= m_Streams[i].channelMask;
+		if (channelsInStreams)
+			UpdateStreams(channelsInStreams, m_VertexCount, GetStreamsLayout (), GetChannelsLayout ());
+		else
+			UpdateStreams(m_CurrentChannels, m_VertexCount, kVertexStreamsDefault, kVertexChannelsDefault);
+	}
+
+	transfer.TransferTypeless (&m_DataSize, "m_DataSize", kHideInEditorMask);
+	if (transfer.DidReadLastProperty ())
+	{
+		if (m_Data)
+			UNITY_FREE (kMemVertexData, m_Data);
+		m_Data = (UInt8*)UNITY_MALLOC_ALIGNED (kMemVertexData, VertexData::GetAllocateDataSize (m_DataSize), kVertexDataAlign);
+	}
+
+	transfer.TransferTypelessData (m_DataSize, m_Data);
+}	
+
+#if SUPPORT_SERIALIZED_TYPETREES
+template<class TransferFunction>
+void VertexData::TransferWorkaround35SerializationFuckup (TransferFunction& transfer)
+{
+	UInt32 currentChannels = m_CurrentChannels;
+	transfer.Transfer (currentChannels, "m_CurrentChannels", kHideInEditorMask);
+	transfer.Transfer (m_VertexCount, "m_VertexCount", kHideInEditorMask);
+
+	TRANSFER(m_Streams[0]);
+	TRANSFER(m_Streams[1]);
+	TRANSFER(m_Streams[2]);
+	TRANSFER(m_Streams[3]);
+
+	if (transfer.IsReading ())
+	{
+		if(m_VertexCount && (currentChannels == 0))
+		{
+			for(int i=0;i<kMaxVertexStreams;i++)
+				currentChannels |= m_Streams[i].channelMask;
+		}
+		UpdateStreams(currentChannels, m_VertexCount);
+		//GetComponentInfo(m_Components, currentChannels);
+		m_CurrentChannels = currentChannels;
+	}
+
+	transfer.TransferTypeless (&m_DataSize, "m_DataSize", kHideInEditorMask);
+
+	if (transfer.IsReading ())
+	{
+		if (m_Data)
+			UNITY_FREE (kMemVertexData, m_Data);
+		m_Data = (UInt8*)UNITY_MALLOC_ALIGNED (kMemVertexData, VertexData::GetAllocateDataSize (m_DataSize), kVertexDataAlign);
+	}
+
+	transfer.TransferTypelessData (m_DataSize, m_Data);
+}
+#endif
+
+INSTANTIATE_TEMPLATE_TRANSFER(VertexData)
+
+void VertexDataInfo::UpdateStreams(unsigned newChannelMask, size_t newVertexCount, const VertexStreamsLayout& streams, const VertexChannelsLayout& channels)
+{
+	m_VertexCount = newVertexCount;
+	m_CurrentChannels = 0;
+	m_VertexSize = 0;
+	size_t streamOffset = 0;
+	for (int s = 0; s < kMaxVertexStreams; s++)
+	{
+		StreamInfo& stream = m_Streams[s];
+		m_Streams[s].Reset();
+		stream.channelMask = streams.channelMasks[s] & newChannelMask;
+		if (stream.channelMask == 0)
+			continue;
+		m_CurrentChannels |= stream.channelMask;
+		for (int c = 0; c < kShaderChannelCount; c++)
+		{
+			if (stream.channelMask & (1 << c))
+			{
+				ChannelInfo& channel = m_Channels[c];
+				const VertexChannelsLayout::Channel& srcChannel = channels.channels[c];
+				channel.stream = s;
+				channel.offset = stream.stride;
+				channel.format = srcChannel.format;
+				channel.dimension = srcChannel.dimension;
+				stream.stride += channel.dimension * GetChannelFormatSize(channel.format);
+			}
+		}
+		streamOffset = AlignStreamSize(streamOffset);
+		stream.offset = streamOffset; 
+		streamOffset += stream.stride * newVertexCount;
+		m_VertexSize += stream.stride;
+	}
+	for (int c = 0; c < kShaderChannelCount; c++)
+	{
+		// Reset channels that were removed
+		if (!(m_CurrentChannels & (1 << c)))
+			m_Channels[c].Reset();
+	}
+	m_DataSize = streamOffset;
+}
+
+size_t VertexDataInfo::GetActiveStreamCount() const 
+{
+	size_t activeStreamCount = 0;
+	for (int i=0; i<kMaxVertexStreams; i++)
+	{
+		if(m_Streams[i].channelMask != 0)
+			activeStreamCount++;
+	}
+	return activeStreamCount;
+}
+
+size_t VertexDataInfo::GetStreamIndex(ShaderChannel channel) const
+{
+	UInt32 channelMask = 1 << channel;
+	for (int i=0; i<kMaxVertexStreams; i++)
+	{
+		if(m_Streams[i].channelMask & channelMask)
+			return i;
+	}
+	return -1;
+}
+
+VertexStreamsLayout VertexDataInfo::GetStreamsLayout() const
+{
+	VertexStreamsLayout result;
+	for (int i = 0; i < kMaxVertexStreams; i++)
+		result.channelMasks[i] = m_Streams[i].channelMask;
+	return result;
+}
+
+VertexChannelsLayout VertexDataInfo::GetChannelsLayout() const
+{
+	VertexChannelsLayout result;
+	for (int i = 0; i < kShaderChannelCount; i++)
+	{
+		result.channels[i] = VertexChannelsLayout::Channel(m_Channels[i].format, m_Channels[i].dimension);
+	}
+	return result;
+}
+
+bool VertexDataInfo::ConformsToStreamsLayout(const VertexStreamsLayout& streams) const
+{
+	for (int i = 0; i < kMaxVertexStreams; i++)
+	{
+		// Fail if we have a channel that's not in the layout
+		if (m_Streams[i].channelMask & ~streams.channelMasks[i])
+			return false;
+	}
+	return true;
+}
+
+bool VertexDataInfo::ConformsToChannelsLayout(const VertexChannelsLayout& channels) const
+{
+	for (int i = 0; i < kShaderChannelCount; i++)
+	{
+		if (m_Channels[i].IsValid())
+		{
+			const VertexChannelsLayout::Channel& channel = channels.channels[i];
+			if (m_Channels[i].format != channel.format ||
+				m_Channels[i].dimension != channel.dimension)
+				return false;
+		}
+	}
+	return true;
+}
+
+signed char f32_to_s8(float fval)
+{
+   return ((fval * 255.0f) - 1.0f) / 2.0f;
+}
+
+float s8_to_f32(signed char val)
+{
+   return (2*(val/255.0f)-1.0f);
+}
+
+static void ConvertCopyChannel(size_t vertexCount, 
+                        const UInt8* srcPtr, UInt8 srcStride, UInt8 srcType, UInt8 srcDim, 
+                        UInt8* dstPtr, UInt8 dstStride, UInt8 dstType, UInt8 dstDim)
+{
+	UInt8 minDim = std::min(srcDim, dstDim);
+	if (srcType == kChannelFormatFloat16 && dstType == kChannelFormatFloat)
+	{
+		// decompressing
+		for (size_t i = 0; i < vertexCount; i++)
+		{
+			UInt8 comp = 0;
+			for ( ; comp < minDim; comp++)
+				HalfToFloat(reinterpret_cast<const UInt16*>(srcPtr)[comp], reinterpret_cast<float*>(dstPtr)[comp]);
+			for ( ; comp < dstDim; comp++)
+				reinterpret_cast<float*>(dstPtr)[comp] = 0.0f;
+			srcPtr += srcStride;
+			dstPtr += dstStride;
+		}
+	}
+	else if (srcType == kChannelFormatByte && dstType == kChannelFormatFloat)
+	{
+		// decompressing
+		for (size_t i = 0; i < vertexCount; i++)
+		{
+			UInt8 comp = 0;
+			for ( ; comp < minDim; comp++)
+				reinterpret_cast<float*>(dstPtr)[comp] = s8_to_f32(reinterpret_cast<const SInt8*>(srcPtr)[comp]);
+			for ( ; comp < dstDim; comp++)
+				reinterpret_cast<float*>(dstPtr)[comp] = 0.0f;
+			srcPtr += srcStride;
+			dstPtr += dstStride;
+		}
+	}
+#if UNITY_EDITOR
+	else if (srcType == kChannelFormatFloat && dstType == kChannelFormatFloat16)
+	{
+		// compressing
+		for (size_t i = 0; i < vertexCount; i++)
+		{
+			UInt8 comp = 0;
+			for ( ; comp < minDim; comp++)
+				g_FloatToHalf.Convert(reinterpret_cast<const float*>(srcPtr)[comp], reinterpret_cast<UInt16*>(dstPtr)[comp]);
+			for ( ; comp < dstDim; comp++)
+				reinterpret_cast<UInt16*>(dstPtr)[comp] = 0;
+			srcPtr += srcStride;
+			dstPtr += dstStride;
+		}
+	}
+	else if (srcType == kChannelFormatFloat && dstType == kChannelFormatByte)
+	{
+		// compressing
+		for (size_t i = 0; i < vertexCount; i++)
+		{
+			UInt8 comp = 0;
+			for ( ; comp < minDim; comp++)
+				reinterpret_cast<SInt8*>(dstPtr)[comp] = f32_to_s8(reinterpret_cast<const float*>(srcPtr)[comp]);
+			for ( ; comp < dstDim; comp++)
+				reinterpret_cast<SInt8*>(dstPtr)[comp] = 0;
+			srcPtr += srcStride;
+			dstPtr += dstStride;
+		}
+	}
+#endif
+	else
+		ErrorString("Unsupported conversion of vertex formats");
+}
+
+static void CopyChannels (size_t vertexCount, unsigned copyChannels, 
+                   const StreamInfoArray srcStreams, const ChannelInfoArray srcChannels, const UInt8* srcData, 
+                   const StreamInfoArray dstStreams, const ChannelInfoArray dstChannels, UInt8* dstData)
+{
+	for (unsigned chan = copyChannels, i = 0; chan && (i < kShaderChannelCount); i++, chan >>= 1)
+	{
+		if (0 == (chan & 1))
+            continue;
+        
+        const ChannelInfo& srcChannel = srcChannels[i];
+        const ChannelInfo& dstChannel = dstChannels[i];
+
+        const UInt8* srcPtr = srcData + srcChannel.CalcOffset(srcStreams);
+        UInt8* dstPtr = dstData + dstChannel.CalcOffset(dstStreams);
+        UInt8 srcStride = srcChannel.CalcStride(srcStreams);
+        UInt8 dstStride = dstChannel.CalcStride(dstStreams);
+        
+        if(srcChannel.format == dstChannel.format)
+        {
+			size_t copySize = srcChannel.dimension * GetChannelFormatSize(srcChannel.format);
+            switch (copySize)
+            {
+                case 4:
+                {
+                    for (size_t i=0; i<vertexCount; ++i)
+                    {
+                        *(reinterpret_cast<UInt32*> (dstPtr) + 0) = *(reinterpret_cast<const UInt32*> (srcPtr) + 0);
+                        srcPtr += srcStride;
+                        dstPtr += dstStride;
+                    }
+                    break;
+                }
+                case 8:
+                {
+                    for (size_t i=0; i<vertexCount; ++i)
+                    {
+                        *(reinterpret_cast<UInt32*> (dstPtr) + 0) = *(reinterpret_cast<const UInt32*> (srcPtr) + 0);
+                        *(reinterpret_cast<UInt32*> (dstPtr) + 1) = *(reinterpret_cast<const UInt32*> (srcPtr) + 1);
+                        srcPtr += srcStride;
+                        dstPtr += dstStride;
+                    }
+                    break;
+                }
+                case 12:
+                {
+                    for (size_t i=0; i<vertexCount; ++i)
+                    {
+                        *(reinterpret_cast<UInt32*> (dstPtr) + 0) = *(reinterpret_cast<const UInt32*> (srcPtr) + 0);
+                        *(reinterpret_cast<UInt32*> (dstPtr) + 1) = *(reinterpret_cast<const UInt32*> (srcPtr) + 1);
+                        *(reinterpret_cast<UInt32*> (dstPtr) + 2) = *(reinterpret_cast<const UInt32*> (srcPtr) + 2);
+                        srcPtr += srcStride;
+                        dstPtr += dstStride;
+                    }
+                    break;
+                }
+                default:
+                {
+                    for (size_t i=0; i<vertexCount; ++i)
+                    {
+                        memcpy (dstPtr, srcPtr, copySize);
+                        srcPtr += srcStride;
+                        dstPtr += dstStride;
+                    }
+                    break;
+                }
+            }
+        }
+        else
+        {
+            ConvertCopyChannel(vertexCount, srcPtr, srcStride, srcChannel.format, srcChannel.dimension, dstPtr, dstStride, dstChannel.format, dstChannel.dimension);
+        }
+    }
+}
+
+VertexDataInfo::VertexDataInfo ()
+:	m_Data(NULL)
+,	m_DataSize(0)
+,	m_VertexCount(0)
+,	m_VertexSize(0)
+,	m_CurrentChannels(0)
+{
+	// Channels and streams have default constructors
+}
+
+VertexData::VertexData (VertexData const& src, unsigned copyChannels, const VertexStreamsLayout& streams, const VertexChannelsLayout& channels)
+{
+	// We do not support inserting new channels that are not present in the source
+	Assert ((copyChannels & src.GetChannelMask()) == copyChannels);
+
+	UpdateStreams(copyChannels, src.m_VertexCount, streams, channels);
+	m_Data = (UInt8*) UNITY_MALLOC_ALIGNED (kMemVertexData, VertexData::GetAllocateDataSize (m_DataSize), kVertexDataAlign);
+	
+	const VertexData& dest = *this;
+	if (m_DataSize == src.m_DataSize &&
+		copyChannels == src.GetChannelMask() && 
+		CompareMemory(dest.m_Channels, src.m_Channels) &&
+		CompareMemory(dest.m_Streams, src.m_Streams))
+	{
+		// Simple copy if the format didn't change
+		memcpy (m_Data, src.m_Data, m_DataSize);
+	}
+	else
+		CopyChannels (m_VertexCount, copyChannels, src.m_Streams, src.m_Channels, src.m_Data, m_Streams, m_Channels, m_Data);
+}
+
+VertexData::~VertexData ()
+{
+	Deallocate();
+}
+
+void VertexData::Deallocate ()
+{
+	if (m_Data)
+		UNITY_FREE(kMemVertexData, m_Data);
+	m_Data = NULL;
+}
+
+void VertexData::Resize (size_t vertexCount, unsigned channelMask, const VertexStreamsLayout& streams, const VertexChannelsLayout& channels)
+{
+	ChannelInfoArray srcChannels;
+	StreamInfoArray srcStreams;
+	memcpy(srcChannels, m_Channels, sizeof(srcChannels));
+	memcpy(srcStreams, m_Streams, sizeof(srcStreams));
+	UInt32 srcChannelMask = m_CurrentChannels;
+	UInt32 srcVertexCount = m_VertexCount;
+	UInt8* srcData = m_Data;
+	
+    UpdateStreams(channelMask, vertexCount, streams, channels);
+	
+	// In case the streams and channels don't change, simply reallocate the buffer and return
+	// Note that this will rarely be true with multiple streams since the stream offsets change
+	if (m_Data && CompareMemory(srcChannels, m_Channels) && CompareMemory(srcStreams, m_Streams))
+	{
+		m_Data = (UInt8*)UNITY_REALLOC_ALIGNED(kMemVertexData, m_Data, VertexData::GetAllocateDataSize(m_DataSize), kVertexDataAlign);
+		return;
+	}
+
+	m_Data = (UInt8*)UNITY_MALLOC_ALIGNED(kMemVertexData, VertexData::GetAllocateDataSize(m_DataSize), kVertexDataAlign);
+	// copy over the old data
+	if (srcData)
+	{
+		unsigned copyChannels = srcChannelMask & m_CurrentChannels;
+		size_t toCopyCount = std::min<size_t>(srcVertexCount, m_VertexCount);
+		CopyChannels(toCopyCount, copyChannels, srcStreams, srcChannels, srcData, m_Streams, m_Channels, m_Data);
+		UNITY_FREE(kMemVertexData, srcData);
+	}
+}
+
+
+void VertexData::SwapEndianess ()
+{
+	unsigned const kChannelSwapMask = VERTEX_FORMAT5(Vertex, Normal, TexCoord0, TexCoord1, Tangent);
+	for (int s = 0; s < kMaxVertexStreams; s++)
+	{
+		if (m_Streams[s].stride)
+		{
+			StreamInfo& stream = m_Streams[s];
+			size_t stride = stream.stride;
+			UInt8* dataStart = m_Data + stream.offset;
+			UInt8* dataEnd = dataStart + stream.stride * m_VertexCount;
+			UInt32 channelMask = stream.channelMask;
+			for (UInt8* p = dataStart, *end = dataEnd; p != end; p += stride)
+			{				
+				// counting from LSb, 1 denotes that a value should be endian-swapped
+				int localOffset = 0;
+				for (unsigned i=0, chan = channelMask, swap = kChannelSwapMask; i<kShaderChannelCount; ++i, chan >>= 1, swap >>= 1)
+				{
+					if (chan & 1)
+					{
+						size_t componentCount = m_Channels[i].dimension;
+						size_t componentSize = GetChannelFormatSize(m_Channels[i].format);
+						if(swap & 1)
+						{
+							Assert (m_Channels [i].IsValid());
+							SwapEndianArray (p + localOffset, componentSize, componentCount);
+						}
+						localOffset += componentCount * componentSize;
+					}
+				}
+			}
+		}
+	}
+}
+
+void swap (VertexData& a, VertexData& b)
+{
+	std::swap_ranges (a.m_Channels, a.m_Channels + kShaderChannelCount, b.m_Channels);
+	std::swap_ranges (a.m_Streams, a.m_Streams + kMaxVertexStreams, b.m_Streams);
+	std::swap (a.m_CurrentChannels, b.m_CurrentChannels);
+	std::swap (a.m_VertexSize, b.m_VertexSize);
+	std::swap (a.m_VertexCount, b.m_VertexCount);
+	std::swap (a.m_DataSize, b.m_DataSize);
+	std::swap (a.m_Data, b.m_Data);
+}
+
+void CopyVertexDataChannels (size_t vertexCount, unsigned copyChannels, const VertexData& srcData, VertexData& dstData)
+{
+	Assert (vertexCount <= srcData.GetVertexCount() && vertexCount <= dstData.GetVertexCount());
+	Assert ((srcData.GetChannelMask() & copyChannels) == copyChannels);
+	Assert ((dstData.GetChannelMask() & copyChannels) == copyChannels);
+	CopyChannels (vertexCount, copyChannels,
+		srcData.GetStreams(), srcData.GetChannels(), srcData.GetDataPtr(),
+		dstData.GetStreams(), dstData.GetChannels(), dstData.GetDataPtr());
+}
+
-- 
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