D3D11: Disable B5G6R5 on AMD drivers.

include/platform/WorkaroundsD3D.h

@@ -87,6 +87,8 @@ struct WorkaroundsD3D
     // In Intel driver, the data with format DXGI_FORMAT_B5G6R5_UNORM will be parsed incorrectly.
     // This workaroud will disable B5G6R5 support when it's Intel driver. By default, it will use
     // R8G8B8A8 format. This bug is fixed in version 4539 on Intel drivers.
+    // On older AMD drivers, the data in DXGI_FORMAT_B5G6R5_UNORM becomes corrupted for unknown
+    // reasons.
     bool disableB5G6R5Support = false;
 
     // On some Intel drivers, evaluating unary minus operator on integer may get wrong answer in

src/libANGLE/renderer/d3d/d3d11/renderer11_utils.cpp

@@ -2404,6 +2404,11 @@ angle::WorkaroundsD3D GenerateWorkarounds(const Renderer11DeviceCaps &deviceCaps
         }
     }
 
+    if (IsAMD(adapterDesc.VendorId))
+    {
+        workarounds.disableB5G6R5Support = true;
+    }
+
     // TODO(jmadill): Disable when we have a fixed driver version.
     workarounds.emulateTinyStencilTextures = IsAMD(adapterDesc.VendorId);