From 49c48a550971d9b68dc84ec38d398bb6392590c1 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 10 Dec 2014 13:05:47 +0000
Subject: [PATCH] Added OpenGL Transform Feedback extensions.

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14600 16af8721-9629-0410-8352-f15c8da7e697
---
 include/osg/GLExtensions | 23 +++++++++++++++++++++++
 src/osg/GLExtensions.cpp | 23 +++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/include/osg/GLExtensions b/include/osg/GLExtensions
index b3b6a0fc8..ec625651d 100644
--- a/include/osg/GLExtensions
+++ b/include/osg/GLExtensions
@@ -577,6 +577,29 @@ class OSG_EXPORT GLExtensions : public osg::Referenced
         void (GL_APIENTRY * glGetSynciv) (GLsync sync, GLenum pname, GLsizei bufSize, GLsizei *length, GLint *values);
 
 
+        // Transform feedback
+        void (GL_APIENTRY * glBeginTransformFeedback) (GLenum primitiveMode);
+        void (GL_APIENTRY * glEndTransformFeedback) (void);
+        void (GL_APIENTRY * glTransformFeedbackVaryings) (GLuint program, GLsizei count, const GLchar *const*varyings, GLenum bufferMode);
+        void (GL_APIENTRY * glGetTransformFeedbackVarying) (GLuint program, GLuint index, GLsizei bufSize, GLsizei *length, GLsizei *size, GLenum *type, GLchar *name);
+        void (GL_APIENTRY * glBindTransformFeedback) (GLenum target, GLuint id);
+        void (GL_APIENTRY * glDeleteTransformFeedbacks) (GLsizei n, const GLuint *ids);
+        void (GL_APIENTRY * glGenTransformFeedbacks) (GLsizei n, GLuint *ids);
+        GLboolean (GL_APIENTRY * glIsTransformFeedback) (GLuint id);
+        void (GL_APIENTRY * glPauseTransformFeedback) (void);
+        void (GL_APIENTRY * glResumeTransformFeedback) (void);
+        void (GL_APIENTRY * glDrawTransformFeedback) (GLenum mode, GLuint id);
+        void (GL_APIENTRY * glDrawTransformFeedbackStream) (GLenum mode, GLuint id, GLuint stream);
+        void (GL_APIENTRY * glDrawTransformFeedbackInstanced) (GLenum mode, GLuint id, GLsizei instancecount);
+        void (GL_APIENTRY * glDrawTransformFeedbackStreamInstanced) (GLenum mode, GLuint id, GLuint stream, GLsizei instancecount);
+        void (GL_APIENTRY * glCreateTransformFeedbacks) (GLsizei n, GLuint *ids);
+        void (GL_APIENTRY * glTransformFeedbackBufferBase) (GLuint xfb, GLuint index, GLuint buffer);
+        void (GL_APIENTRY * glTransformFeedbackBufferRange) (GLuint xfb, GLuint index, GLuint buffer, GLintptr offset, GLsizei size);
+        void (GL_APIENTRY * glGetTransformFeedbackiv) (GLuint xfb, GLenum pname, GLint *param);
+        void (GL_APIENTRY * glGetTransformFeedbacki_v) (GLuint xfb, GLenum pname, GLuint index, GLint *param);
+        void (GL_APIENTRY * glGetTransformFeedbacki64_v) (GLuint xfb, GLenum pname, GLuint index, GLint64 *param);
+
+
 };
 
 
diff --git a/src/osg/GLExtensions.cpp b/src/osg/GLExtensions.cpp
index dd83bad38..4bf3a8771 100644
--- a/src/osg/GLExtensions.cpp
+++ b/src/osg/GLExtensions.cpp
@@ -1042,6 +1042,29 @@ GLExtensions::GLExtensions(unsigned int contextID)
     osg::setGLExtensionFuncPtr(glWaitSync, "glWaitSync");
     osg::setGLExtensionFuncPtr(glGetSynciv, "glGetSynciv");
 
+
+    // Transform Feeedback
+    osg::setGLExtensionFuncPtr(glBeginTransformFeedback, "glBeginTransformFeedback", "glBeginTransformFeedbackEXT");
+    osg::setGLExtensionFuncPtr(glEndTransformFeedback, "glEndTransformFeedback", "glEndTransformFeedbackEXT");
+    osg::setGLExtensionFuncPtr(glTransformFeedbackVaryings, "glTransformFeedbackVaryings", "glTransformFeedbackVaryingsEXT");
+    osg::setGLExtensionFuncPtr(glGetTransformFeedbackVarying, "glGetTransformFeedbackVarying", "glGetTransformFeedbackVaryingEXT");
+    osg::setGLExtensionFuncPtr(glBindTransformFeedback, "glBindTransformFeedback");
+    osg::setGLExtensionFuncPtr(glDeleteTransformFeedbacks, "glDeleteTransformFeedbacks");
+    osg::setGLExtensionFuncPtr(glGenTransformFeedbacks, "glGenTransformFeedbacks");
+    osg::setGLExtensionFuncPtr(glIsTransformFeedback, "glIsTransformFeedback");
+    osg::setGLExtensionFuncPtr(glPauseTransformFeedback, "glPauseTransformFeedback");
+    osg::setGLExtensionFuncPtr(glResumeTransformFeedback, "glResumeTransformFeedback");
+    osg::setGLExtensionFuncPtr(glDrawTransformFeedback, "glDrawTransformFeedback");
+    osg::setGLExtensionFuncPtr(glDrawTransformFeedbackStream, "glDrawTransformFeedbackStream");
+    osg::setGLExtensionFuncPtr(glDrawTransformFeedbackInstanced, "glDrawTransformFeedbackInstanced");
+    osg::setGLExtensionFuncPtr(glDrawTransformFeedbackStreamInstanced, "glDrawTransformFeedbackStreamInstanced");
+    osg::setGLExtensionFuncPtr(glCreateTransformFeedbacks, "glCreateTransformFeedbacks");
+    osg::setGLExtensionFuncPtr(glTransformFeedbackBufferBase, "glTransformFeedbackBufferBase");
+    osg::setGLExtensionFuncPtr(glTransformFeedbackBufferRange, "glTransformFeedbackBufferRange");
+    osg::setGLExtensionFuncPtr(glGetTransformFeedbackiv, "glGetTransformFeedbackiv");
+    osg::setGLExtensionFuncPtr(glGetTransformFeedbacki_v, "glGetTransformFeedbacki_v");
+    osg::setGLExtensionFuncPtr(glGetTransformFeedbacki64_v, "glGetTransformFeedbacki64_v");
+
 }