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Karan Vora
73eaa1f18b
image_sample_d and image_sample_cd on a cube pass their gradients through the same conversion as the face coordinates, which subtracts 1.0 to move AMD's [1, 2] face range to [0, 1]. A gradient is a difference of coordinates, so the bias turned a one-texel gradient into one of about -1 and the sample read the smallest mip. Gradients now skip the bias. agc_driver_image_sample_cube_derivatives samples every face of a 16x16 cube at five levels through image_sample_d and checks the level and face it read. TechnicalDebt records that the gradient handling follows Mesa and was not measured on hardware.