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- Description
The TDx_3DVertexBuffer::ProcessVertices() method processes or moves vertices from one vertex buffer to another.
The destination buffer calls this method, effectively processing transformed vertices into itself from a source vertex buffer.
Processing consists of applying the transformation matrices of the TDx_3DDevice plus optional clipping, lighting and extents processing.
If the method call fails, the OnError event will be triggered with one of the following values:
D3DERR_INVALIDVERTEXFORMAT
DDERR_INVALIDOBJECT
DDERR_INVALIDPARAMS
DDERR_OUTOFMEMORY
DDERR_SURFACEBUSY
DDERR_SURFACELOST
- Parameters
VertexOp
The VertexOp parameter indicates how to process vertices as they are transferred.
The described effect applies when the flag is set.
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D3DVOP_CLIP
Transform and clip vertices using the viewing frustrum.
Cannot be set for vertex buffers without clipping information.
eg: those with D3DVBCAPS_DONOTCLIP set.
D3DVOP_EXTENTS
Transform and update the screen rectangle extents when the vertices are rendered.
May improve performance, but the TDx_3DDevice::GetClipStatus() extents are not updated when this technique is employed.
D3DVOP_LIGHT
Transform and light the vertices.
D3DVOP_TRANSFORM
Transform the vertices using the world, view and projection matrices of the TDx_3DDevice.
This flag must always be set or the method will fail, returning DDERR_INVALIDPARAMS.
The DestIndex parameter indicates where processed vertices are to be placed in this, the destination buffer.
Count
The Count parameter defines how many of the source buffer vertices to process.
SrcBuffer
The SrcBuffer parameter references the source TDx_3DVertexBuffer.
SrcIndex
The SrcIndex parameter indicates where in the source buffer to begin processing.
D3DDevice
The D3DDevice parameter references the TDx_3DDevice that is being used to transform the vertices.
Flags
The Flags parameter indicates whether unmodified vertices should be transferred.
The described effect applies when the flag is set.
Set 0 for default processing, which is still copy vertices unmodified by the current vertex operation from the source to the destination buffer.
-
D3DPV_DONOTCOPYDATA
Copy only those vertices modified in the current vertex operation to the destination buffer.
- See Also
- Top
TDx_3DI_Library v2.00 Component Reference
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[ TDx_3DVertexBuffer::ProcessVertices() ] [ next: ProcessVerticesStrided() ] [ prev: Optimize() ] public:
virtual bool __fastcall ProcessVertices( dword pVertexOp, dword pDestIndex, dword pCount, TDx_3DVertexBuffer* pSrcBuffer, dword pSrcIndex, TDx_3DDevice* pD3DDevice, dword pFlags );
TDX_3DVERTEXBUFFER::PROCESSVERTICES()
[ component method ]
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