Initial transform feedback support (#1370)

* Initial transform feedback support

* Some nits and fixes

* Update ReportCounterType and Write method

* Can't change shader or TFB bindings while TFB is active

* Fix geometry shader input names with new naming

3 files changed, 25 insertions, 1 deletions

diff --git a/Ryujinx.Graphics.GAL/IPipeline.cs b/Ryujinx.Graphics.GAL/IPipeline.cs
index 3eb778e0..7c67a172 100644
--- a/Ryujinx.Graphics.GAL/IPipeline.cs
+++ b/Ryujinx.Graphics.GAL/IPipeline.cs
@@ -7,6 +7,8 @@ namespace Ryujinx.Graphics.GAL
     {
         void Barrier();
 
+        void BeginTransformFeedback(PrimitiveTopology topology);
+
         void ClearRenderTargetColor(int index, uint componentMask, ColorF color);
 
         void ClearRenderTargetDepthStencil(
@@ -27,6 +29,8 @@ namespace Ryujinx.Graphics.GAL
             int firstVertex,
             int firstInstance);
 
+        void EndTransformFeedback();
+
         void SetBlendState(int index, BlendDescriptor blend);
 
         void SetDepthBias(PolygonModeMask enables, float factor, float units, float clamp);
@@ -73,6 +77,7 @@ namespace Ryujinx.Graphics.GAL
 
         void SetTexture(int index, ShaderStage stage, ITexture texture);
 
+        void SetTransformFeedbackBuffer(int index, BufferRange buffer);
         void SetUniformBuffer(int index, ShaderStage stage, BufferRange buffer);
 
         void SetUserClipDistance(int index, bool enableClip);
diff --git a/Ryujinx.Graphics.GAL/IRenderer.cs b/Ryujinx.Graphics.GAL/IRenderer.cs
index 1052f147..6fd3feba 100644
--- a/Ryujinx.Graphics.GAL/IRenderer.cs
+++ b/Ryujinx.Graphics.GAL/IRenderer.cs
@@ -13,7 +13,7 @@ namespace Ryujinx.Graphics.GAL
 
         BufferHandle CreateBuffer(int size);
 
-        IProgram CreateProgram(IShader[] shaders);
+        IProgram CreateProgram(IShader[] shaders, TransformFeedbackDescriptor[] transformFeedbackDescriptors);
 
         ISampler CreateSampler(SamplerCreateInfo info);
         ITexture CreateTexture(TextureCreateInfo info, float scale);
diff --git a/Ryujinx.Graphics.GAL/TransformFeedbackDescriptor.cs b/Ryujinx.Graphics.GAL/TransformFeedbackDescriptor.cs
new file mode 100644
index 00000000..690b9108
--- /dev/null
+++ b/Ryujinx.Graphics.GAL/TransformFeedbackDescriptor.cs
@@ -0,0 +1,19 @@
+using System;
+
+namespace Ryujinx.Graphics.GAL
+{
+    public struct TransformFeedbackDescriptor
+    {
+        public int BufferIndex { get; }
+        public int Stride      { get; }
+
+        public byte[] VaryingLocations { get; }
+
+        public TransformFeedbackDescriptor(int bufferIndex, int stride, byte[] varyingLocations)
+        {
+            BufferIndex      = bufferIndex;
+            Stride           = stride;
+            VaryingLocations = varyingLocations ?? throw new ArgumentNullException(nameof(varyingLocations));
+        }
+    }
+}