Ad workaround for broken B5G6R5 format in Intel driver.

gfx/angle/src/libANGLE/renderer/d3d/WorkaroundsD3D.h

@@ -68,6 +68,11 @@ struct WorkaroundsD3D
     // of the HLSL GetDimensions builtin.
     bool getDimensionsIgnoresBaseLevel = false;
     
+    // In the Intel driver, data with format DXGI_FORMAT_B5G6R5_UNORM will be parsed incorrectly.
+    // This workaroud will disable B5G6R5 support when it's Intel's driver. By default, we will
+    // use R8G8B8A8 as format.
+    bool disableB5G6R5Support = false;
+
     // On some Intel drivers, HLSL's function texture.Load returns 0 when the parameter Location
     // is negative, even if the sum of Offset and Location is in range. This may cause errors when
     // translating GLSL's function texelFetchOffset into texture.Load, as it is valid for

gfx/angle/src/libANGLE/renderer/d3d/d3d11/Renderer11.cpp

@@ -896,11 +896,19 @@ void Renderer11::populateRenderer11DeviceCaps()
         }
     }
 
-    hr = mDevice->CheckFormatSupport(DXGI_FORMAT_B5G6R5_UNORM, &(mRenderer11DeviceCaps.B5G6R5support));
+    if (getWorkarounds().disableB5G6R5Support)
-    if (FAILED(hr))
     {
         mRenderer11DeviceCaps.B5G6R5support = 0;
     }
+    else
+    {
+        hr = mDevice->CheckFormatSupport(DXGI_FORMAT_B5G6R5_UNORM,
+                                         &(mRenderer11DeviceCaps.B5G6R5support));
+        if (FAILED(hr))
+        {
+            mRenderer11DeviceCaps.B5G6R5support = 0;
+        }
+    }
 
     hr = mDevice->CheckFormatSupport(DXGI_FORMAT_B4G4R4A4_UNORM, &(mRenderer11DeviceCaps.B4G4R4A4support));
     if (FAILED(hr))

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

@@ -1541,6 +1541,7 @@ WorkaroundsD3D GenerateWorkarounds(const Renderer11DeviceCaps &deviceCaps,
     workarounds.getDimensionsIgnoresBaseLevel     = (adapterDesc.VendorId == VENDOR_ID_NVIDIA);
 
     workarounds.preAddTexelFetchOffsets = (adapterDesc.VendorId == VENDOR_ID_INTEL);
+    workarounds.disableB5G6R5Support    = (adapterDesc.VendorId == VENDOR_ID_INTEL);
 
     return workarounds;
 }