From f7c16d5a83a5213976f0a886efdb23a630c9f58b Mon Sep 17 00:00:00 2001
From: apo <apo@opencascade.com>
Date: Tue, 5 Sep 2006 08:19:23 +0000
Subject: [PATCH] To fix compilation bug in case of Mandriva64 usage. The used
 "glXGetProcAddressARB" function is conditionally declared in the "GL/glx.h".
 So, to be sure that the function will be acessible in compile time it is
 necessary to define the "GLX_GLXEXT_LEGACY" preporcessor variable before
 including the "GL/glx.h" header file.

---
 src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx | 67 +++++++++++++------
 1 file changed, 47 insertions(+), 20 deletions(-)

diff --git a/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx b/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx
index 401ca646..680a21ab 100755
--- a/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx
+++ b/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx
@@ -51,6 +51,9 @@
 #include <cmath>
 #include <string>
 
+#ifndef GLX_GLXEXT_LEGACY
+#define GLX_GLXEXT_LEGACY
+#endif
 #include <GL/glx.h>
 
 #ifndef VTK_IMPLEMENT_MESA_CXX
@@ -138,43 +141,67 @@ static PFNGLDELETEBUFFERSARBPROC            vglDeleteBuffersARB           = NULL
 
 bool InitializeARB()
 {
-  //void* OpenGLLibrary = dlopen( "libGL.so", RTLD_LAZY );
-
   vglShaderSourceARB = (PFNGLSHADERSOURCEARBPROC)glXGetProcAddressARB( (const GLubyte*)"glShaderSourceARB" );
+  if( !vglShaderSourceARB )
+    return false;
+
   vglCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC)glXGetProcAddressARB( (const GLubyte*)"glCreateShaderObjectARB" );
+  if( !vglCreateShaderObjectARB )
+    return false;
+
   vglCompileShaderARB = (PFNGLCOMPILESHADERARBPROC)glXGetProcAddressARB( (const GLubyte*)"glCompileShaderARB" );
+  if( !vglCompileShaderARB )
+    return false;
+
   vglCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC)glXGetProcAddressARB( (const GLubyte*)"glCreateProgramObjectARB" );
+  if( !vglCreateProgramObjectARB )
+    return false;
+
   vglAttachObjectARB = (PFNGLATTACHOBJECTARBPROC)glXGetProcAddressARB( (const GLubyte*)"glAttachObjectARB" );
+  if( !vglAttachObjectARB )
+    return false;
+
   vglLinkProgramARB = (PFNGLLINKPROGRAMARBPROC)glXGetProcAddressARB( (const GLubyte*)"glLinkProgramARB" );
+  if( !vglLinkProgramARB )
+    return false;
+
   vglUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC)glXGetProcAddressARB( (const GLubyte*)"glUseProgramObjectARB" );
+  if( !vglUseProgramObjectARB )
+    return false;
+
   vglGetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC)glXGetProcAddressARB( (const GLubyte*)"glGetObjectParameterivARB" );
+  if( !vglGetObjectParameterivARB )
+    return false;
+
   vglGetInfoLogARB = (PFNGLGETINFOLOGARBPROC)glXGetProcAddressARB( (const GLubyte*)"glGetInfoLogARB" );
+  if( !vglGetInfoLogARB )
+    return false;
+
   vglGetAttribLocationARB = (PFNGLGETATTRIBLOCATIONARBPROC)glXGetProcAddressARB( (const GLubyte*)"glGetAttribLocationARB" );
+  if( !vglGetAttribLocationARB )
+    return false;
+
   vglVertexAttrib1fARB = (PFNGLVERTEXATTRIB1FARBPROC)glXGetProcAddressARB( (const GLubyte*)"glVertexAttrib1fARB" );
+  if( !vglVertexAttrib1fARB )
+    return false;
 
   vglGenBuffersARB = (PFNGLGENBUFFERSARBPROC)glXGetProcAddressARB( (const GLubyte*)"glGenBuffersARB" );
+  if( !vglGenBuffersARB )
+    return false;
+
   vglBindBufferARB = (PFNGLBINDBUFFERARBPROC)glXGetProcAddressARB( (const GLubyte*)"glBindBufferARB" );
+  if( !vglBindBufferARB )
+    return false;
+
   vglBufferDataARB = (PFNGLBUFFERDATAARBPROC)glXGetProcAddressARB( (const GLubyte*)"glBufferDataARB" );
+  if( !vglBufferDataARB )
+    return false;
+
   vglDeleteBuffersARB = (PFNGLDELETEBUFFERSARBPROC)glXGetProcAddressARB( (const GLubyte*)"glDeleteBuffersARB" );
+  if( !vglDeleteBuffersARB )
+    return false;
 
-  if( vglShaderSourceARB && 
-      vglCreateShaderObjectARB &&
-      vglCompileShaderARB &&
-      vglCreateProgramObjectARB &&
-      vglAttachObjectARB &&
-      vglLinkProgramARB &&
-      vglUseProgramObjectARB &&
-      vglGetObjectParameterivARB &&
-      vglGetInfoLogARB &&
-      vglGetAttribLocationARB &&
-      vglVertexAttrib1fARB &&
-      vglGenBuffersARB &&
-      vglBindBufferARB &&
-      vglBufferDataARB &&
-      vglDeleteBuffersARB )
-    return true;
-
-  return false;
+  return true;
 };
 
 static bool IsARBInitialized = InitializeARB();
-- 
2.39.2