From 1ef3d3a7589eeabf0229cb3c6a9419d0eef2a681 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Thu, 26 Feb 2004 22:09:28 +0000
Subject: check for invalid vertex/fragment program in glBegin

---
 src/mesa/tnl/t_vtx_api.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/mesa/tnl/t_vtx_api.c b/src/mesa/tnl/t_vtx_api.c
index b69a1a612e..a9a1c5bd5f 100644
--- a/src/mesa/tnl/t_vtx_api.c
+++ b/src/mesa/tnl/t_vtx_api.c
@@ -992,6 +992,15 @@ static void GLAPIENTRY _tnl_Begin( GLenum mode )
 {
    GET_CURRENT_CONTEXT( ctx ); 
 
+   if ((ctx->VertexProgram.Enabled
+        && !ctx->VertexProgram.Current->Instructions) ||
+       (ctx->FragmentProgram.Enabled
+        && !ctx->FragmentProgram.Current->Instructions)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glBegin (invalid vertex/fragment program)");
+      return;
+   }
+
    if (ctx->Driver.CurrentExecPrimitive == GL_POLYGON+1) {
       TNLcontext *tnl = TNL_CONTEXT(ctx); 
       int i;
-- 
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