Juan A. Suarez Romero
ec7a33af58
So far ANV was advertising 4 bits for both subTexelPrecisionBits and mipmapPrecisionBits. But these values were not actually verified. But it seems the right value is actually 8 bits for both cases. Unfortunately Intel PRM does not clarify how many bits the hardware use. For the mipmap case, there is the following reference in PRM Volume 6 (3D Media GPGPU), specifically in LOD Computation Pseudocode: ``` Bias: S4.8 MinLod: U4.8 MaxLod: U4.8 Base: U4.1 MIPCnt: U4 SurfMinLod: U4.8 ResMinLod: U4.8 `` We have other clues, though: - On one side, dEQP-VK.texture.explicit_lod.* tests fail when using 4 bits, but work when using 8 bits. These tests try to mimic the expected behaviour as much real as possible, and they use the reported subTexelPrecisionBits and mipmapPrecisionBits reported to get this. - On the other side, the equivalent driver for Windows is reporting 8 bits for both elements. Not sure if they got to verify it from the PRM or from a diffent source. CC: Jason Ekstrand <jason@jlekstrand.net> CC: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
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