From 405bc1b1f681d5c0adef132227f0a8efdee1375d Mon Sep 17 00:00:00 2001
From: Christopher Tenter <christopher.tenter@rwth-aachen.de>
Date: Fri, 29 Aug 2014 10:34:28 +0000
Subject: [PATCH] check gl4 extensions at compile time for mac etc.

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free-Staging@19471 383ad7c9-94d9-4d36-a494-682f7c89f535
---
 .../OITLinkedList.cc                          | 35 +++++++++++++++++--
 .../OITLinkedList.hh                          | 13 +++++--
 2 files changed, 42 insertions(+), 6 deletions(-)

diff --git a/PluginCollection-Renderers/Plugin-Render-OITLinkedList/OITLinkedList.cc b/PluginCollection-Renderers/Plugin-Render-OITLinkedList/OITLinkedList.cc
index 2c66387..cb26ca9 100644
--- a/PluginCollection-Renderers/Plugin-Render-OITLinkedList/OITLinkedList.cc
+++ b/PluginCollection-Renderers/Plugin-Render-OITLinkedList/OITLinkedList.cc
@@ -34,9 +34,9 @@
 
 /*===========================================================================*\
 *                                                                            *
-*   $Revision: 13374 $                                                       *
-*   $LastChangedBy: moebius $                                                *
-*   $Date: 2012-01-13 09:38:16 +0100 (Fri, 13 Jan 2012) $                     *
+*   $Revision$                                                       *
+*   $LastChangedBy$                                                *
+*   $Date$                     *
 *                                                                            *
 \*===========================================================================*/
 
@@ -54,6 +54,9 @@
 #include <ACG/GL/GLError.hh>
 
 
+// check for glew symbol definition
+#ifdef GL_ARB_shader_image_load_store
+
 
 /*
 OIT with per pixel linked list (A-Buffer).
@@ -385,6 +388,29 @@ void OITLinkedList::renderOIT(int w, int h, bool multisampled)
 }
 
 
+
+QString OITLinkedList::checkOpenGL()
+{
+  // Get version and check
+  if ( !ACG::openGLVersion(4,2) )
+    return QString("Insufficient OpenGL Version! OpenGL 4.2 or higher required");
+
+  // Check extensions
+  QString glExtensions = QString((const char*)glGetString(GL_EXTENSIONS));
+  QString missing("");
+  if ( !glExtensions.contains("ARB_shader_image_load_store") )
+    missing += "ARB_shader_image_load_store extension missing\n";
+
+  if ( !glExtensions.contains("GL_ARB_shader_atomic_counters") )
+    missing += "GL_ARB_shader_atomic_counters extension missing\n";
+
+  if ( !glExtensions.contains("GL_ARB_gpu_shader5") )
+    missing += "GL_ARB_gpu_shader5 extension missing\n";
+
+  return missing;
+}
+
+
 QString OITLinkedList::renderObjectsInfo( bool _outputShaderInfo )
 {
   std::vector<ACG::ShaderModifier*> mods;
@@ -397,3 +423,6 @@ QString OITLinkedList::renderObjectsInfo( bool _outputShaderInfo )
 #endif
 
 
+
+
+#endif // GL_ARB_shader_image_load_store
diff --git a/PluginCollection-Renderers/Plugin-Render-OITLinkedList/OITLinkedList.hh b/PluginCollection-Renderers/Plugin-Render-OITLinkedList/OITLinkedList.hh
index 52ad586..107c43a 100644
--- a/PluginCollection-Renderers/Plugin-Render-OITLinkedList/OITLinkedList.hh
+++ b/PluginCollection-Renderers/Plugin-Render-OITLinkedList/OITLinkedList.hh
@@ -34,9 +34,9 @@
 
 /*===========================================================================*\
 *                                                                            *
-*   $Revision: 13374 $                                                       *
-*   $LastChangedBy: moebius $                                                *
-*   $Date: 2012-01-13 09:38:16 +0100 (Fri, 13 Jan 2012) $                     *
+*   $Revision$                                                       *
+*   $LastChangedBy$                                                *
+*   $Date$                     *
 *                                                                            *
 \*===========================================================================*/
 
@@ -54,6 +54,11 @@
 #include <ACG/GL/globjects.hh>
 #include <ACG/GL/FBO.hh>
 
+
+// check for glew symbol definition
+#ifdef GL_ARB_shader_image_load_store
+
+
 class OITLinkedList : public QObject, BaseInterface, RenderInterface, LoggingInterface, ACG::IRenderer
 {
   Q_OBJECT
@@ -117,3 +122,5 @@ private:
 
 };
 
+
+#endif // GL_ARB_shader_image_load_store
-- 
GitLab