Metal: Allow additional swapchain formats

Bug: 42241264
Change-Id: Idb9b11f3faa0eca2ab58faa814872a3fc70b78a3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/187142
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Loko Kung <lokokung@google.com>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

src/dawn/native/Surface.cpp

diff --git a/src/dawn/native/Surface.cpp b/src/dawn/native/Surface.cpp
index b1ea52c..013b535 100644
--- a/src/dawn/native/Surface.cpp
+++ b/src/dawn/native/Surface.cpp
@@ -206,18 +206,6 @@
     DAWN_TRY_ASSIGN(format, device->GetInternalFormat(config->format));
     DAWN_ASSERT(format != nullptr);
 
-    // TODO(crbug.com/dawn/160): Lift this restriction once
-    // wgpu::Instance::GetPreferredSurfaceFormat is implemented.
-    // TODO(dawn:286):
-#if DAWN_PLATFORM_IS(ANDROID)
-    constexpr wgpu::TextureFormat kRequireSwapChainFormat = wgpu::TextureFormat::RGBA8Unorm;
-#else
-    constexpr wgpu::TextureFormat kRequireSwapChainFormat = wgpu::TextureFormat::BGRA8Unorm;
-#endif  // !DAWN_PLATFORM_IS(ANDROID)
-    DAWN_INVALID_IF(config->format != kRequireSwapChainFormat,
-                    "Format (%s) is not %s, which is (currently) the only accepted format.",
-                    config->format, kRequireSwapChainFormat);
-
     if (device->HasFeature(Feature::SurfaceCapabilities)) {
         wgpu::TextureUsage validUsage;
         DAWN_TRY_ASSIGN(validUsage, device->GetSupportedSurfaceUsage(surface));

src/dawn/native/metal/BackendMTL.mm

diff --git a/src/dawn/native/metal/BackendMTL.mm b/src/dawn/native/metal/BackendMTL.mm
index 4d99129..5cbf306 100644
--- a/src/dawn/native/metal/BackendMTL.mm
+++ b/src/dawn/native/metal/BackendMTL.mm
@@ -306,8 +306,14 @@
 
         // Formats
 
-        // This is the only supported format in native mode (see crbug.com/dawn/160).
-        capabilities.formats.push_back(wgpu::TextureFormat::BGRA8Unorm);
+        capabilities.formats = {
+            wgpu::TextureFormat::BGRA8Unorm,
+            wgpu::TextureFormat::BGRA8UnormSrgb,
+            wgpu::TextureFormat::RGBA16Float,
+        };
+#if DAWN_PLATFORM_IS(MACOS)
+        capabilities.formats.push_back(wgpu::TextureFormat::RGB10A2Unorm);
+#endif  // DAWN_PLATFORM_IS(MACOS)
 
         // Present Modes