[Piglit] [PATCH 00/23] Tests for all GLSL texture functions (almost)

[Marek Olšák]

Hi,

This adds tests for all GLSL texture function. The tex-miplevel-selection test is used, since it's a good foundation for testing texturing with mipmaps.

All functions are tested except for textureGrad with Cube samplers (I think the GL spec doesn't define how Cube derivates are interpreted).

All combinations of the following states: BASE_LEVEL, MAX_LEVEL, MIN_LOD, MAX_LOD, LOD_BIAS or shader-provided bias, mipmap or no mipmap filtering, and scaling texture coordinates to affect the implicit LOD, are tested with almost all GLSL functions. 2DRect is an exception, since it doesn't have any mipmap tree.

This doesn't test every aspect of texturing. Generally, the test only checks if the correct level and layer/slice/face is sampled except for the *Offset and 2DRect functions, which test if the correct texel is sampled.

There is some overlap with other piglit tests, as well as within the test itself, because it tests both GL2 (e.g. texture2DProj) and GL3 (e.g. textureProj) functions.

Marek