From 60952ca959866ee37c6d7ecd59d193255e9de6fd Mon Sep 17 00:00:00 2001
From: kgv <kgv@opencascade.com>
Date: Mon, 14 Mar 2016 13:05:36 +0300
Subject: [PATCH] 0027257: Visualization, TKOpenGl - bind integer vertex
 attributes

---
 src/OpenGl/OpenGl_VertexBuffer.hxx |  2 +-
 src/OpenGl/OpenGl_VertexBuffer.lxx | 10 +++++++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/OpenGl/OpenGl_VertexBuffer.hxx b/src/OpenGl/OpenGl_VertexBuffer.hxx
index decacec959..6944de51d8 100644
--- a/src/OpenGl/OpenGl_VertexBuffer.hxx
+++ b/src/OpenGl/OpenGl_VertexBuffer.hxx
@@ -15,7 +15,7 @@
 #ifndef _OpenGl_VertexBuffer_H__
 #define _OpenGl_VertexBuffer_H__
 
-#include <OpenGl_GlCore20.hxx>
+#include <OpenGl_GlCore32.hxx>
 #include <OpenGl_Resource.hxx>
 #include <OpenGl_Context.hxx>
 #include <OpenGl_ShaderProgram.hxx>
diff --git a/src/OpenGl/OpenGl_VertexBuffer.lxx b/src/OpenGl/OpenGl_VertexBuffer.lxx
index 5545c4a62d..f6ae02a4ac 100644
--- a/src/OpenGl/OpenGl_VertexBuffer.lxx
+++ b/src/OpenGl/OpenGl_VertexBuffer.lxx
@@ -35,7 +35,15 @@ inline void OpenGl_VertexBuffer::bindAttribute (const Handle(OpenGl_Context)&
   }
 
   theCtx->core20fwd->glEnableVertexAttribArray (theAttribute);
-  theCtx->core20fwd->glVertexAttribPointer (theAttribute, theNbComp, theDataType, theDataType != GL_FLOAT, theStride, theOffset);
+  if (theDataType == GL_UNSIGNED_INT
+   && theCtx->core32 != NULL)
+  {
+    theCtx->core32->glVertexAttribIPointer (theAttribute, theNbComp, theDataType, theStride, theOffset);
+  }
+  else
+  {
+    theCtx->core20fwd->glVertexAttribPointer (theAttribute, theNbComp, theDataType, theDataType != GL_FLOAT, theStride, theOffset);
+  }
 }
 
 #if !defined(GL_ES_VERSION_2_0)
-- 
2.39.5