GRADIENT ADJUSTMENT FOR TEXTURE MAPPING TO NON-ORTHONORMAL GRID

摘要

In a computer graphics processing unit (GPU) having a texture unit, when pixel sample locations are based on a non-orthonormal grid in scene space, the texture unit receives texture space gradient values directly, e.g., from a shader unit or generates them from texture coordinates supplied, e.g., by a shader unit, and then applies a transformation to the gradient values configured to adjust the gradient values to those which would arise from the use of a orthonormal screen space grid.

主权项

1. A computer graphics system, comprising:
a graphics processing unit (GPU) having a texture unit;
wherein the texture unit is configured to receive or generate texture space gradient values for one or more primitives based on a non-orthonormal grid of sample points in a screen space and apply a transformation configured to generate corresponding ortho-normal texture space gradient values corrected for the non-orthonormality of the sample points in screen space,wherein the texture unit is configured to apply the transformation to the difference values between texture coordinate values to generate the gradient values.