Enable Alpha Test workaround on Metal

src/Ryujinx.Graphics.Gpu/Shader/GpuAccessor.cs

@@ -16,7 +16,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
         private readonly GpuAccessorState _state;
         private readonly int _stageIndex;
         private readonly bool _compute;
-        private readonly bool _isVulkan;
+        private readonly bool _isOpenGL;
         private readonly bool _hasGeometryShader;
         private readonly bool _supportsQuads;
 
@@ -38,7 +38,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
             _channel = channel;
             _state = state;
             _stageIndex = stageIndex;
-            _isVulkan = context.Capabilities.Api == TargetApi.Vulkan;
+            _isOpenGL = context.Capabilities.Api == TargetApi.OpenGL;
             _hasGeometryShader = hasGeometryShader;
             _supportsQuads = context.Capabilities.SupportsQuads;
 
@@ -116,10 +116,10 @@ namespace Ryujinx.Graphics.Gpu.Shader
         public GpuGraphicsState QueryGraphicsState()
         {
             return _state.GraphicsState.CreateShaderGraphicsState(
-                !_isVulkan,
+                _isOpenGL,
                 _supportsQuads,
                 _hasGeometryShader,
-                _isVulkan || _state.GraphicsState.YNegateEnabled);
+                !_isOpenGL || _state.GraphicsState.YNegateEnabled);
         }
 
         /// <inheritdoc/>

src/Ryujinx.Graphics.Metal/Pipeline.cs

@@ -428,7 +428,9 @@ namespace Ryujinx.Graphics.Metal
 
         public void SetAlphaTest(bool enable, float reference, CompareOp op)
         {
-            Logger.Warning?.Print(LogClass.Gpu, "Not Implemented!");
+            // This is currently handled using shader specialization, as Metal does not support alpha test.
+            // In the future, we may want to use this to write the reference value into the support buffer,
+            // to avoid creating one version of the shader per reference value used.
         }
 
         public void SetBlendState(AdvancedBlendDescriptor blend)