radv: enable TC-compat HTILE for 16-bit depth surfaces on GFX8
The hardware only supports 32-bit depth surfaces, but we can enable TC-compat HTILE for 16-bit depth surfaces if no Z planes are compressed. The main benefit is to reduce the number of depth decompression passes. Also, we don't need to implement DB->CB copies which is fine. This improves Serious Sam 2017 by +4%. Talos and F12017 are also affected but I don't see a performance difference. This also improves the shadowmapping Vulkan demo by 10-15% (FPS is now similar to AMDVLK). No CTS regressions on Polaris10. Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
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@ -3614,6 +3614,15 @@ radv_calc_decompress_on_z_planes(struct radv_device *device,
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max_zplanes = 2;
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max_zplanes = max_zplanes + 1;
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} else {
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if (iview->vk_format == VK_FORMAT_D16_UNORM) {
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/* Do not enable Z plane compression for 16-bit depth
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* surfaces because isn't supported on GFX8. Only
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* 32-bit depth surfaces are supported by the hardware.
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* This allows to maintain shader compatibility and to
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* reduce the number of depth decompressions.
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*/
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max_zplanes = 1;
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} else {
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if (iview->image->info.samples <= 1)
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max_zplanes = 5;
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@ -3622,6 +3631,7 @@ radv_calc_decompress_on_z_planes(struct radv_device *device,
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else
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max_zplanes = 2;
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}
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}
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return max_zplanes;
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}
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@ -91,18 +91,14 @@ radv_image_is_tc_compat_htile(struct radv_device *device,
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pCreateInfo->format == VK_FORMAT_D32_SFLOAT_S8_UINT)
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return false;
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if (device->physical_device->rad_info.chip_class >= GFX9) {
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/* GFX9 supports both 32-bit and 16-bit depth surfaces. */
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/* GFX9 supports both 32-bit and 16-bit depth surfaces, while GFX8 only
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* supports 32-bit. Though, it's possible to enable TC-compat for
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* 16-bit depth surfaces if no Z planes are compressed.
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*/
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if (pCreateInfo->format != VK_FORMAT_D32_SFLOAT_S8_UINT &&
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pCreateInfo->format != VK_FORMAT_D32_SFLOAT &&
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pCreateInfo->format != VK_FORMAT_D16_UNORM)
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return false;
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} else {
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/* GFX8 only supports 32-bit depth surfaces. */
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if (pCreateInfo->format != VK_FORMAT_D32_SFLOAT_S8_UINT &&
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pCreateInfo->format != VK_FORMAT_D32_SFLOAT)
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return false;
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}
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return true;
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}
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