From 58f6f4201ec9091b5150f6576da25bfedeabbdce Mon Sep 17 00:00:00 2001
From: tbaudier <thomas.baudier@creatis.insa-lyon.fr>
Date: Fri, 6 Oct 2017 10:40:16 +0200
Subject: [PATCH] Update to OpenGL2

---
 vv/CMakeLists.txt        |  6 ++++++
 vv/vvBlendImageActor.cxx | 16 +++++++++++++---
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/vv/CMakeLists.txt b/vv/CMakeLists.txt
index a20b0b0..fe6120e 100644
--- a/vv/CMakeLists.txt
+++ b/vv/CMakeLists.txt
@@ -9,6 +9,12 @@ endif(COMMAND cmake_policy)
 #=========================================================
 OPTION(CLITK_USE_PACS_CONNECTION "USE PACS CONNECTION"       OFF)
 #=========================================================
+
+# Look for OpenGL2 version
+if (VTK_RENDERING_BACKEND STREQUAL "OpenGL2")
+  add_definitions(-DVTK_OPENGL2)
+endif ()
+
 #List of vv tools to compile
 set(vv_TOOLS
   vvToolMedianFilter
diff --git a/vv/vvBlendImageActor.cxx b/vv/vvBlendImageActor.cxx
index 2093c7d..24434d1 100644
--- a/vv/vvBlendImageActor.cxx
+++ b/vv/vvBlendImageActor.cxx
@@ -17,12 +17,14 @@ It is distributed under dual licence
 ===========================================================================**/
 
 #include "vvBlendImageActor.h"
-
+#ifdef VTK_OPENGL2
+  #include <vtk_glew.h>
+#else
+  #include <vtkgl.h>
+#endif
 #include <vtkOpenGLRenderWindow.h>
-#include <vtkOpenGLExtensionManager.h>
 #include <vtkOpenGLRenderer.h>
 #include <vtkOpenGL.h>
-#include <vtkgl.h>
 #include <vtkObjectFactory.h>
 
 vtkStandardNewMacro(vvBlendImageActor);
@@ -40,6 +42,13 @@ void vvBlendImageActor::Render(vtkRenderer *ren)
 {
   //Change blending to maximum per component instead of weighted sum
   vtkOpenGLRenderWindow *renwin = dynamic_cast<vtkOpenGLRenderWindow*>(ren->GetRenderWindow());
+#ifdef VTK_OPENGL2
+  const char *extensions = renwin->ReportCapabilities();
+
+  //Call normal render
+  VTK_IMAGE_ACTOR::Render(ren);
+
+#else
   vtkOpenGLExtensionManager *extensions = renwin->GetExtensionManager();
   if (extensions->ExtensionSupported("GL_EXT_blend_minmax")) {
     extensions->LoadExtension("GL_EXT_blend_minmax");
@@ -53,6 +62,7 @@ void vvBlendImageActor::Render(vtkRenderer *ren)
   if (vtkgl::BlendEquationEXT!=0) {
     vtkgl::BlendEquationEXT( vtkgl::FUNC_ADD );
   }
+#endif
 }
 
 void vvBlendImageActor::PrintSelf(ostream& os, vtkIndent indent)
-- 
2.45.1