1 files changed, 75 insertions, 0 deletions
diff --git a/Runtime/GfxDevice/opengl/ARBVBO.h b/Runtime/GfxDevice/opengl/ARBVBO.h
new file mode 100644
index 0000000..f9513f4
--- /dev/null
+++ b/Runtime/GfxDevice/opengl/ARBVBO.h
@@ -0,0 +1,75 @@
+#pragma once
+
+#include "Runtime/Shaders/VBO.h"
+
+void BindARBVertexBuffer( int id );
+void BindARBIndexBuffer( int id );
+
+//	Implements VBO through ARB_vertex_buffer_object.
+class ARBVBO : public VBO {
+public:
+	ARBVBO();
+	virtual ~ARBVBO();
+
+	virtual void UpdateVertexData( const VertexBufferData& buffer );
+	virtual void UpdateIndexData (const IndexBufferData& buffer);
+	virtual void DrawVBO (const ChannelAssigns& channels, UInt32 firstIndexByte, UInt32 indexCount,
+					  GfxPrimitiveType topology, UInt32 firstVertex, UInt32 vertexCount);
+	virtual void DrawCustomIndexed( const ChannelAssigns& channels, void* indices, UInt32 indexCount,
+								   GfxPrimitiveType topology, UInt32 vertexRangeBegin, UInt32 vertexRangeEnd, UInt32 drawVertexCount );
+	virtual int GetRuntimeMemorySize() const { return m_VBSize + m_IBSize; }
+
+	virtual bool MapVertexStream( VertexStreamData& outData, unsigned stream );
+	virtual void UnmapVertexStream( unsigned stream );
+	virtual bool IsVertexBufferLost() const { return false; }
+
+
+private:
+	void DrawInternal( const ChannelAssigns& channels, const void* indices, UInt32 indexCount,
+					  GfxPrimitiveType topology, UInt32 drawVertexCount );
+	void VerifyVertexBuffer();
+	void UpdateIndexBufferData (const IndexBufferData& sourceData);
+
+private:
+	ChannelInfoArray m_Channels;
+	int     m_VertexCount;
+	int		m_VertexBindID;
+	int		m_IndexBindID;
+	int     m_VBSize;
+	int     m_IBSize;
+};
+
+
+#if 0
+
+// Ok, dynamic VBOs with updating just the chunks with BufferSubData seem to be slower (by 30% - 50%)
+// than just rendering from memory arrays. This is on MacBook Pro RX1600 (10.4.9), MBP GeForce8600 (10.5.7)
+// and PC GeForce 6800 (93.xx). Using APPLE_flush_buffer_range does not help with performance.
+// So we just don't use them for now!
+
+// This is dynamic vertex buffer, with index buffer just fed from memory.
+// The reason is that BufferSubData on index buffers is really buggy on some drivers
+// (e.g. Mac OS X 10.4.8/10.4.9 on X1600).
+class DynamicARBVBO : public DynamicVBO {
+public:
+	DynamicARBVBO( UInt32 vbSize );
+	virtual ~DynamicARBVBO();
+
+	virtual bool GetChunk( UInt32 shaderChannelMask, UInt32 maxVertices, UInt32 maxIndices, RenderMode renderMode, void** outVB, void** outIB );
+	virtual void ReleaseChunk( UInt32 actualVertices, UInt32 actualIndices );
+	virtual void DrawChunk (const ChannelAssigns& channels);
+
+private:
+	size_t	m_BufferChannelOffsets[kShaderChannelCount];
+
+	UInt32	m_VBSize;
+	UInt32	m_VBUsedBytes;
+
+	int		m_VertexBindID;
+	UInt32	m_VBChunkSize;
+	UInt8*	m_IBChunk;
+	UInt32	m_IBChunkSize;
+};
+
+#endif
+