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image_sample_c on an 8-bit UNORM T# returns 0 for every compare function on gfx1035, as on 8-bit sRGB (measured on the hardware oracle in the review of #3438), but the emulated comparison still compared the red channel. 8, 8_8 and 8_8_8_8 UNORM now return 0 like 8-bit sRGB. Every texel comparison of those formats is 0, so a bilinear cube without DISABLE_CUBE_WRAP and an anisotropic S# cannot change the result; both are accepted for them, as the cube already was for 8-bit sRGB. Other formats keep both refusals. The test rows that check real comparisons move to 16_16 UNORM.