Module: Mesa
Branch: master
Commit: f944a59996287de85d4c6d9b7b000d25f41b1d79
URL:    
http://cgit.freedesktop.org/mesa/mesa/commit/?id=f944a59996287de85d4c6d9b7b000d25f41b1d79

Author: Bas Nieuwenhuizen <[email protected]>
Date:   Sat May 12 23:56:56 2018 +0200

radv: Disable texel buffers with A2 SNORM/SSCALED/SINT for pre-vega.

The hardware always interprets the alpha as unsigned and fixing it
in the shader is going to add unacceptable overheads.

CC: 18.0 18.1 <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106480
Reviewed-by: Samuel Pitoiset <[email protected]>

---

 src/amd/vulkan/radv_formats.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/amd/vulkan/radv_formats.c b/src/amd/vulkan/radv_formats.c
index f8438f43b8..1ac07b41a6 100644
--- a/src/amd/vulkan/radv_formats.c
+++ b/src/amd/vulkan/radv_formats.c
@@ -657,6 +657,25 @@ radv_physical_device_get_format_properties(struct 
radv_physical_device *physical
                tiled |= VK_FORMAT_FEATURE_STORAGE_IMAGE_ATOMIC_BIT;
        }
 
+       switch(format) {
+       case VK_FORMAT_A2R10G10B10_SNORM_PACK32:
+       case VK_FORMAT_A2B10G10R10_SNORM_PACK32:
+       case VK_FORMAT_A2R10G10B10_SSCALED_PACK32:
+       case VK_FORMAT_A2B10G10R10_SSCALED_PACK32:
+       case VK_FORMAT_A2R10G10B10_SINT_PACK32:
+       case VK_FORMAT_A2B10G10R10_SINT_PACK32:
+               if (physical_device->rad_info.chip_class <= VI &&
+                   physical_device->rad_info.family != CHIP_STONEY) {
+                       buffer &= ~(VK_FORMAT_FEATURE_UNIFORM_TEXEL_BUFFER_BIT |
+                                   VK_FORMAT_FEATURE_STORAGE_TEXEL_BUFFER_BIT);
+                       linear = 0;
+                       tiled = 0;
+               }
+               break;
+       default:
+               break;
+       }
+
        out_properties->linearTilingFeatures = linear;
        out_properties->optimalTilingFeatures = tiled;
        out_properties->bufferFeatures = buffer;

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