Mesa (master): mesa: Don' t call _mesa_ClipControl from glPopAttrib when unsupported.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 8ca8dd123af78e9d4ff08f8fac2346e17fb7a0ee
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8ca8dd123af78e9d4ff08f8fac2346e17fb7a0ee

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Mon Nov  3 18:16:41 2014 -0800

mesa: Don't call _mesa_ClipControl from glPopAttrib when unsupported.

Otherwise, calling glPopAttrib on drivers that don't support
ARB_clip_control gives you a GL error, which is surprising at best.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/main/attrib.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/mesa/main/attrib.c b/src/mesa/main/attrib.c
index 5345339..4684615 100644
--- a/src/mesa/main/attrib.c
+++ b/src/mesa/main/attrib.c
@@ -1345,7 +1345,8 @@ _mesa_PopAttrib(void)
                if (xform->DepthClamp != ctx->Transform.DepthClamp)
                   _mesa_set_enable(ctx, GL_DEPTH_CLAMP,
                                    ctx->Transform.DepthClamp);
-               _mesa_ClipControl(xform->ClipOrigin, xform->ClipDepthMode);
+               if (ctx->Extensions.ARB_clip_control)
+                  _mesa_ClipControl(xform->ClipOrigin, xform->ClipDepthMode);
             }
             break;
          case GL_TEXTURE_BIT: