I'm trying to perform a vertex texture fetch on a GeForce 7600 with driver 169.12 under 64-bit Linux. When I set the filtering to:
TexParameteri( TEXTURE_2D, TEXTURE_MAG_FILTER, LINEAR );
TexParameteri( TEXTURE_2D, TEXTURE_MIN_FILTER, LINEAR_MIPMAP_LINEAR );
The texture fetch works, but I get a huge slow down, presumably because I'm hitting the software fallback. But when I set the filtering to:
TexParameteri( TEXTURE_2D, TEXTURE_MAG_FILTER, NEAREST );
TexParameteri( TEXTURE_2D, TEXTURE_MIN_FILTER, NEAREST_MIPMAP_NEAREST );
It goes fast, but the vertex texture fetch doesn't seem to work. Is there something I'm missing? That's the only thing I change, as suggested by:
Nvidia vertex texture paper
I'm using the following to set the texture format:
TexImage2D( TEXTURE_2D, 0, LUMINANCE32F, width, height, 0, LUMINANCE, FLOAT, data );
