metal: set texture usage flags

src/video_core/renderer_metal/mtl_texture_cache.cpp

@@ -63,6 +63,8 @@ Image::Image(TextureCacheRuntime& runtime_, const ImageInfo& info, GPUVAddr gpu_
     texture_descriptor->setPixelFormat(MaxwellToMTL::GetPixelFormat(info.format));
     texture_descriptor->setWidth(info.size.width);
     texture_descriptor->setHeight(info.size.height);
+    texture_descriptor->setDepth(info.size.depth);
+    texture_descriptor->setUsage(MTL::TextureUsageShaderRead | MTL::TextureUsageRenderTarget);
     // TODO: set other parameters
 
     texture = runtime->device.GetDevice()->newTexture(texture_descriptor);

src/video_core/renderer_metal/renderer_metal.cpp

@@ -122,7 +122,7 @@ void RendererMetal::CreateBlitPipelineState() {
     pipeline_descriptor->setVertexFunction(vertex_function);
     pipeline_descriptor->setFragmentFunction(fragment_function);
     // TODO: get the pixel format from metal layer
-    pipeline_descriptor->colorAttachments()->object(0)->setPixelFormat(MTL::PixelFormatRGBA8Unorm);
+    pipeline_descriptor->colorAttachments()->object(0)->setPixelFormat(MTL::PixelFormatBGRA8Unorm);
 
     error = nullptr;
     blit_pipeline_state = device.GetDevice()->newRenderPipelineState(pipeline_descriptor, &error);