panfrost: Z24 variants should be sampled as R32UI
Midgard has no dedicated samplers for Z24S8 and Z24X8 formats, and the GPU expects the depth to be encoded in an IEEE 32-bit float. Turn all Z24_UNORM variants into R32UI and let the shader do the conversion using bfe+fmul instructions. Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3697>
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@ -186,9 +186,17 @@ panfrost_find_format(const struct util_format_description *desc) {
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return MALI_RGB10_A2I;
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case PIPE_FORMAT_Z32_UNORM:
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return MALI_Z32_UNORM;
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case PIPE_FORMAT_Z24X8_UNORM:
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case PIPE_FORMAT_Z24_UNORM_S8_UINT:
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return MALI_Z32_UNORM;
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/* Midgard has no dedicated samplers for Z24S8 and Z24X8
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* formats, and the GPU expects the depth to be encoded in an
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* IEEE 32-bit float. Turn all Z24_UNORM variants into R32UI
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* and let the shader do the conversion using bfe+fmul
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* instructions.
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*/
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return MALI_R32UI;
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case PIPE_FORMAT_Z32_FLOAT_S8X24_UINT:
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/* Z32F = R32F to the hardware */
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