1 files changed, 31 insertions, 0 deletions
diff --git a/Ryujinx.Graphics.OpenGL/Framebuffer.cs b/Ryujinx.Graphics.OpenGL/Framebuffer.cs
index aececbe8..015b0ec0 100644
--- a/Ryujinx.Graphics.OpenGL/Framebuffer.cs
+++ b/Ryujinx.Graphics.OpenGL/Framebuffer.cs
@@ -13,6 +13,9 @@ namespace Ryujinx.Graphics.OpenGL
 
         private readonly TextureView[] _colors;
 
+        private int _colorsCount;
+        private bool _dualSourceBlend;
+
         public Framebuffer()
         {
             Handle = GL.GenFramebuffer();
@@ -97,8 +100,36 @@ namespace Ryujinx.Graphics.OpenGL
             }
         }
 
+        public void SetDualSourceBlend(bool enable)
+        {
+            bool oldEnable = _dualSourceBlend;
+
+            _dualSourceBlend = enable;
+
+            // When dual source blend is used,
+            // we can only have one draw buffer.
+            if (enable)
+            {
+                GL.DrawBuffer(DrawBufferMode.ColorAttachment0);
+            }
+            else if (oldEnable)
+            {
+                SetDrawBuffersImpl(_colorsCount);
+            }
+        }
+
         public void SetDrawBuffers(int colorsCount)
         {
+            if (_colorsCount != colorsCount && !_dualSourceBlend)
+            {
+                SetDrawBuffersImpl(colorsCount);
+            }
+
+            _colorsCount = colorsCount;
+        }
+
+        private void SetDrawBuffersImpl(int colorsCount)
+        {
             DrawBuffersEnum[] drawBuffers = new DrawBuffersEnum[colorsCount];
 
             for (int index = 0; index < colorsCount; index++)