opengl32: glBindTexture() and glDeleteTextures() require an active GL context

[Bruno Jesus]

Very similar to bug 36506 but for other functions.

Fixes bug http://bugs.winehq.org/show_bug.cgi?id=34847
-------------- next part --------------
diff --git a/dlls/opengl32/opengl_norm.c b/dlls/opengl32/opengl_norm.c
index 78a72ef..6408745 100644
--- a/dlls/opengl32/opengl_norm.c
+++ b/dlls/opengl32/opengl_norm.c
@@ -61,6 +61,7 @@ void WINAPI glBegin( GLenum mode ) {
  */
 void WINAPI glBindTexture( GLenum target, GLuint texture ) {
   const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
+  if (!funcs) return; /* called without an active gl context */
   TRACE("(%d, %d)\n", target, texture );
   funcs->gl.p_glBindTexture( target, texture );
 }
@@ -547,6 +548,7 @@ void WINAPI glDeleteLists( GLuint list, GLsizei range ) {
  */
 void WINAPI glDeleteTextures( GLsizei n, const GLuint* textures ) {
   const struct opengl_funcs *funcs = NtCurrentTeb()->glTable;
+  if (!funcs) return; /* called without an active gl context */
   TRACE("(%d, %p)\n", n, textures );
   funcs->gl.p_glDeleteTextures( n, textures );
 }