From 6166a19fdaf0c5a16b67116679761c454fd5ac89 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Sat, 29 Mar 2014 18:23:20 -0500
Subject: [PATCH] Fix build without GL interop

---
 pyopencl/_cffi.py         |  1 +
 pyopencl/cffi_cl.py       |  5 +++--
 src/c_wrapper/wrap_cl.cpp | 15 +++++++++++++--
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/pyopencl/_cffi.py b/pyopencl/_cffi.py
index d72c0538..ec233557 100644
--- a/pyopencl/_cffi.py
+++ b/pyopencl/_cffi.py
@@ -112,4 +112,5 @@ def _get_wrapcl_so_name():
 _lib = _ffi.dlopen(_get_wrapcl_so_name())
 
 if _lib.pyopencl_have_gl():
+    print "GL!"
     _ffi.cdef(_get_wrap_header("wrap_cl_gl_core.h"))
diff --git a/pyopencl/cffi_cl.py b/pyopencl/cffi_cl.py
index 1502af60..4746b2bb 100644
--- a/pyopencl/cffi_cl.py
+++ b/pyopencl/cffi_cl.py
@@ -830,8 +830,9 @@ def _create_gl_enqueue(what):
         return _create_instance(Event, ptr_event[0])
     return enqueue_gl_objects
 
-enqueue_acquire_gl_objects = _create_gl_enqueue(_lib._enqueue_acquire_gl_objects)
-enqueue_release_gl_objects = _create_gl_enqueue(_lib._enqueue_release_gl_objects)
+if _lib.pyopencl_have_gl():
+    enqueue_acquire_gl_objects = _create_gl_enqueue(_lib._enqueue_acquire_gl_objects)
+    enqueue_release_gl_objects = _create_gl_enqueue(_lib._enqueue_release_gl_objects)
 
 # }}}
 
diff --git a/src/c_wrapper/wrap_cl.cpp b/src/c_wrapper/wrap_cl.cpp
index ba2ba120..02c2526e 100644
--- a/src/c_wrapper/wrap_cl.cpp
+++ b/src/c_wrapper/wrap_cl.cpp
@@ -305,6 +305,16 @@ run_python_gc();                                \
 
 // {{{ more odds and ends
 
+#ifdef HAVE_GL
+#define GL_SWITCHCLASS(OPERATION) \
+  case ::CLASS_GL_BUFFER: OPERATION(GL_BUFFER, gl_buffer); break; \
+  case ::CLASS_GL_RENDERBUFFER: OPERATION(GL_RENDERBUFFER, gl_renderbuffer); break;
+#else
+#define GL_SWITCHCLASS(OPERATION) \
+  case ::CLASS_GL_BUFFER: \
+  case ::CLASS_GL_RENDERBUFFER:
+#endif
+
 #define SWITCHCLASS(OPERATION)                                          \
   switch(class_) {                                                      \
   case ::CLASS_PLATFORM: OPERATION(PLATFORM, platform); break;          \
@@ -315,10 +325,9 @@ run_python_gc();                                \
   case ::CLASS_BUFFER: OPERATION(BUFFER, buffer); break;                \
   case ::CLASS_PROGRAM: OPERATION(PROGRAM, program); break;             \
   case ::CLASS_EVENT: OPERATION(EVENT, event); break;                   \
-  case ::CLASS_GL_BUFFER: OPERATION(GL_BUFFER, gl_buffer); break;       \
-  case ::CLASS_GL_RENDERBUFFER: OPERATION(GL_RENDERBUFFER, gl_renderbuffer); break; \
   case ::CLASS_IMAGE: OPERATION(IMAGE, image); break; \
   case ::CLASS_SAMPLER: OPERATION(SAMPLER, sampler); break; \
+  GL_SWITCHCLASS(OPERATION) \
   default: throw pyopencl::error("unknown class", CL_INVALID_VALUE);    \
   }
 
@@ -3351,6 +3360,7 @@ int pyopencl_have_gl() {
 }
 
 
+#ifdef HAVE_GL
 error *_create_from_gl_buffer(
     void **ptr, void *ptr_context, cl_mem_flags flags, GLuint bufobj)
 {
@@ -3414,6 +3424,7 @@ error *_create_from_gl_renderbuffer(
 
   return 0;
 }
+#endif /* HAVE_GL */
 
 // }}}
 
-- 
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