Added error checking in _tnl_Begin to detect incomplete framebuffer.

Set new tnl->DiscardPrimitive field to true when such error is
detected to discard the glBegin/End primitive when flushing.
Added some new comments.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/tnl/t_context.h b/src/mesa/tnl/t_context.h
index 9eaff95b73d..f36dec23a59 100644
--- a/src/mesa/tnl/t_context.h
+++ b/src/mesa/tnl/t_context.h
@@ -782,6 +782,12 @@ typedef struct
 
    GLboolean _DoVertexFog;  /* eval fog function at each vertex? */
 
+   /* If True, it means we started a glBegin/End primtive with an invalid
+    * vertex/fragment program or incomplete framebuffer.  In that case,
+    * discard any buffered vertex data.
+    */
+   GLboolean DiscardPrimitive;
+
    GLuint render_inputs;
 
    GLvertexformat exec_vtxfmt;