texRECTsize - returns the size of a given texture image for a given level of detail.
int3 texRECTsize(samplerRECT samp, int lod)
int3 texRECTsize(isamplerRECT samp, int lod)
int3 texRECTsize(usamplerRECT samp, int lod)
Sampler to be queried for size.
Level of detail to obtain size.
Given a sampler and a level of detail the size of the corresponding texture image is returned as
the result of the operation.
texRECTsize is only supported in gp4 and newer profiles.