fix some compile errors

projects/apis/metal/CMakeLists.txt

@@ -3,7 +3,7 @@ set(CMAKE_CXX_STANDARD 17)
 project(GryphnMetalImpl)
 
 file(GLOB_RECURSE SOURCE_FILES CONFIGURE_DEPENDS
-    "src/*.c" "src/*.h" "src/*.m" "src/*.mm"
+    "src/*.c" "src/*.cpp" "src/*.h" "src/*.m" "src/*.mm"
 )
 file(GLOB_RECURSE LOADER_FILES CONFIGURE_DEPENDS
     "loader/*.m"

projects/apis/metal/src/surface/metal_surface.m

@@ -41,8 +41,9 @@ gnSurfaceDetails getMetalSurfaceDetails(
 MTLPixelFormat mtlGryphnFormatToMetalFormat(gnImageFormat format) {
     switch (format) {
     case GN_FORMAT_NONE: return MTLPixelFormatInvalid;
-    case GN_FORMAT_BGRA8_SRGB: return MTLPixelFormatBGRA8Unorm_sRGB;
     case GN_FORMAT_BGRA8: return MTLPixelFormatBGRA8Unorm;
+    case GN_FORMAT_BGRA8_SRGB: return MTLPixelFormatBGRA8Unorm_sRGB;
+    case GN_FORMAT_RGBA8: return MTLPixelFormatRGBA8Unorm;
     case GN_FORMAT_RGBA8_SRGB: return MTLPixelFormatRGBA8Unorm_sRGB;
     case GN_FORMAT_D24S8_UINT: return MTLPixelFormatDepth24Unorm_Stencil8;
     case GN_FORMAT_D32S8_UINT: return MTLPixelFormatDepth32Float_Stencil8;