Stop using glTransformFeedbackVaryings and use explicit layout on the shader (#3012)

* Stop using glTransformFeedbackVarying and use explicit layout on the shader

* This is no longer needed

* Shader cache version bump

* Fix gl_PerVertex output for tessellation control shaders

Ryujinx.Graphics.Gpu/Shader/GpuAccessor.cs

@@ -222,6 +222,35 @@ namespace Ryujinx.Graphics.Gpu.Shader
             }
         }
 
+        /// <summary>
+        /// Queries transform feedback enable state.
+        /// </summary>
+        /// <returns>True if the shader uses transform feedback, false otherwise</returns>
+        public bool QueryTransformFeedbackEnabled()
+        {
+            return _state.TransformFeedbackDescriptors != null;
+        }
+
+        /// <summary>
+        /// Queries the varying locations that should be written to the transform feedback buffer.
+        /// </summary>
+        /// <param name="bufferIndex">Index of the transform feedback buffer</param>
+        /// <returns>Varying locations for the specified buffer</returns>
+        public ReadOnlySpan<byte> QueryTransformFeedbackVaryingLocations(int bufferIndex)
+        {
+            return _state.TransformFeedbackDescriptors[bufferIndex].VaryingLocations;
+        }
+
+        /// <summary>
+        /// Queries the stride (in bytes) of the per vertex data written into the transform feedback buffer.
+        /// </summary>
+        /// <param name="bufferIndex">Index of the transform feedback buffer</param>
+        /// <returns>Stride for the specified buffer</returns>
+        public int QueryTransformFeedbackStride(int bufferIndex)
+        {
+            return _state.TransformFeedbackDescriptors[bufferIndex].Stride;
+        }
+
         /// <summary>
         /// Queries if host state forces early depth testing.
         /// </summary>