Merge pull request #939 from cdavis5e/macos-rgb10a2-surface

MVKDevice: Advertise VK_FORMAT_A2B10G10R10_UNORM_PACK32 as a surface format.
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
index 7788b8d..947b7d4 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
@@ -619,7 +619,16 @@
 		MTLPixelFormatBGRA8Unorm,
 		MTLPixelFormatBGRA8Unorm_sRGB,
 		MTLPixelFormatRGBA16Float,
+#if MVK_MACOS
+		MTLPixelFormatRGB10A2Unorm,
 		MTLPixelFormatBGR10A2Unorm,
+#endif
+#if MVK_IOS_OR_TVOS
+		MTLPixelFormatBGRA10_XR,
+		MTLPixelFormatBGRA10_XR_sRGB,
+		MTLPixelFormatBGR10_XR,
+		MTLPixelFormatBGR10_XR_sRGB,
+#endif
 	};
 
 	MVKSmallVector<VkColorSpaceKHR, 16> colorSpaces;
@@ -670,7 +679,12 @@
 	}
 
 	uint mtlFmtsCnt = sizeof(mtlFormats) / sizeof(MTLPixelFormat);
+#if MVK_MACOS
 	if ( !_pixelFormats.isSupported(MTLPixelFormatBGR10A2Unorm) ) { mtlFmtsCnt--; }
+#endif
+#if MVK_IOS_OR_TVOS
+	if ( !_pixelFormats.isSupported(MTLPixelFormatBGRA10_XR) ) { mtlFmtsCnt -= 4; }
+#endif
 
 	const uint vkFmtsCnt = mtlFmtsCnt * (uint)colorSpaces.size();