From cd203e98f2bed076798972da1d108bb64b1884ec Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Thu, 19 Jul 2018 02:33:27 -0300
Subject: Implement Geometry shaders (#280)

* Implement Geometry shaders

* Add EmitVertex() and EndPrimitive()

* Read output geometry data from header

* Stub Vmad

* Add Iadd_I32

* Stub Mov_S (S2R)

* Stub Isberd

* Change vertex index to gpr39 in Abuf

* Add stub messages for consistency

* Do not print input block when there is no attributes

* Use GL_ARB_enhanced_layouts

* Skip geometry shaders when there's no GL_ARB_enhanced_layouts

* Address feedback

* Address feedback
---
 Ryujinx.Graphics/Gal/OpenGL/OGLExtension.cs | 43 +++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Ryujinx.Graphics/Gal/OpenGL/OGLExtension.cs

(limited to 'Ryujinx.Graphics/Gal/OpenGL/OGLExtension.cs')

diff --git a/Ryujinx.Graphics/Gal/OpenGL/OGLExtension.cs b/Ryujinx.Graphics/Gal/OpenGL/OGLExtension.cs
new file mode 100644
index 00000000..69fce6d3
--- /dev/null
+++ b/Ryujinx.Graphics/Gal/OpenGL/OGLExtension.cs
@@ -0,0 +1,43 @@
+using OpenTK.Graphics.OpenGL;
+
+namespace Ryujinx.Graphics.Gal.OpenGL
+{
+    static class OGLExtension
+    {
+        private static bool Initialized = false;
+
+        private static bool EnhancedLayouts;
+
+        public static bool HasEnhancedLayouts()
+        {
+            EnsureInitialized();
+
+            return EnhancedLayouts;
+        }
+
+        private static void EnsureInitialized()
+        {
+            if (Initialized)
+            {
+                return;
+            }
+
+            EnhancedLayouts = HasExtension("GL_ARB_enhanced_layouts");
+        }
+
+        private static bool HasExtension(string Name)
+        {
+            int NumExtensions = GL.GetInteger(GetPName.NumExtensions);
+
+            for (int Extension = 0; Extension < NumExtensions; Extension++)
+            {
+                if (GL.GetString(StringNameIndexed.Extensions, Extension) == Name)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+    }
+}
\ No newline at end of file
-- 
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