Commit: 56fbdd790899301b4baf290ae693ceb9a4d5d467
Author: Clément Foucault
Date:   Wed Apr 25 15:17:48 2018 +0200
Branches: blender2.8
https://developer.blender.org/rB56fbdd790899301b4baf290ae693ceb9a4d5d467

GHOST: Fix missing glXCreatePbuffer initialisation.

For some reason this happened if no windows are created before creating an
offscreen context.

===================================================================

M       intern/ghost/intern/GHOST_ContextGLX.cpp

===================================================================

diff --git a/intern/ghost/intern/GHOST_ContextGLX.cpp 
b/intern/ghost/intern/GHOST_ContextGLX.cpp
index 2256e58d61d..815189b9098 100644
--- a/intern/ghost/intern/GHOST_ContextGLX.cpp
+++ b/intern/ghost/intern/GHOST_ContextGLX.cpp
@@ -149,7 +149,9 @@ GHOST_TSuccess GHOST_ContextGLX::initializeDrawingContext()
                    (glXChooseFBConfig = 
(PFNGLXCHOOSEFBCONFIGPROC)glXGetProcAddressARB(
                             (const GLubyte *)"glXChooseFBConfig")) == NULL ||
                    (glXCreateContextAttribsARB = 
(PFNGLXCREATECONTEXTATTRIBSARBPROC)glXGetProcAddressARB(
-                            (const GLubyte *)"glXCreateContextAttribsARB")) == 
NULL)
+                            (const GLubyte *)"glXCreateContextAttribsARB")) == 
NULL ||
+                   (glXCreatePbuffer = 
(PFNGLXCREATEPBUFFERPROC)glXGetProcAddressARB(
+                            (const GLubyte *)"glXCreatePbuffer")) == NULL)
                {
                        extStart = (GLubyte *)"";
                }

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