For experts - compressed textures
Author
We use compressed .dds textures. I wonder when the device make decompression. Always when the g_pDevice->SetTexture() is called, or always when the texture is rasterized over polygons?
Is it important to batch SetTexture() calls with compressed dds, more than with normal (uncompressed) textures?
thanks in advance
If the hardware supports a compressed format (say D3DFMT_DXT1) then it will usually do the decompression "on the fly" when it needs it. The exact inner workings of the driver/GPU are largely irrelevant and unknown [smile]
Apart from some compatability/legacy functionality hidden by the driver, I don't see any reason why they'd actually decompress the whole texture on a SetTexture() call - if the renderer can't directly read from the texels then it's more than likely not going to expose it as a supported format.
hth
Jack
Apart from some compatability/legacy functionality hidden by the driver, I don't see any reason why they'd actually decompress the whole texture on a SetTexture() call - if the renderer can't directly read from the texels then it's more than likely not going to expose it as a supported format.
hth
Jack
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