Comment # 10
on bug 66067
from Nicholas Miell
To quote the Cg tutorial: "Notice that the code for the shadow map query is virtually identical to the code for the projective texture lookup in Example 9-6. To a Cg programmer, shadow maps are like other projective textures, except that instead of returning a texture color,tex2Dproj returns a value representing shadow coverage. The underlying hardware implementation automatically recognizes when a texture is a depth texture (instead of a color texture) and performs the shadow map comparison instead of an ordinary texture fetch." I suspect that the Cg compiler always compiles tex2Dproj to a TEX instruction with the SHADOW2D target and relies on OpenGL implementations always transparently using normal sampling on non-depth non-stencil textures.
You are receiving this mail because:
- You are the assignee for the bug.
_______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
