Efficient UV Streams
Author
I am using multi-streaming and noticed that I have to provide a UV stream for each texture stage. This seems crazy, as the UV co-ordinates are the same for each stage. Is there any way I can use the same stream to provide the UV's to all stages, or do I have to create multiple streams using the same buffer?
Thanks
Rael
You can determine, for each texture stage, which texture set gets used using the D3DTSS_TEXCOORDINDEX member of D3DTEXTURESTAGESTATE. For example:
device->SetTextureStageState(1, D3DTSS_TEXCOORDINDEX, 0);
...binds the first uv set to the second texture stage.
device->SetTextureStageState(1, D3DTSS_TEXCOORDINDEX, 0);
...binds the first uv set to the second texture stage.
You can have multiple UV sets in a single stream - use 4 sets per stream, for example, to minmize the number of streams. Beware that multiple streams will cost performance. Also note that Coder's solution will not work with ps1.x - you must directly map tc index to stream (0->0, 1->1, etc).
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