From dd9e6e7e37fbb8c30c8085ed784539d94110aa3e Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keith@tungstengraphics.com>
Date: Tue, 27 Jan 2004 18:44:50 +0000
Subject: Catch and shortcircuit no-primitive and no-vertex cases in
 _tnl_wrap_buffers()

---
 src/mesa/tnl/t_vtx_api.c | 59 +++++++++++++++++++++++++++++++-----------------
 1 file changed, 38 insertions(+), 21 deletions(-)

(limited to 'src/mesa/tnl/t_vtx_api.c')

diff --git a/src/mesa/tnl/t_vtx_api.c b/src/mesa/tnl/t_vtx_api.c
index 3dbef2add0..b69a1a612e 100644
--- a/src/mesa/tnl/t_vtx_api.c
+++ b/src/mesa/tnl/t_vtx_api.c
@@ -52,32 +52,47 @@ static void init_attrfv( TNLcontext *tnl );
 static void _tnl_wrap_buffers( GLcontext *ctx )
 {
    TNLcontext *tnl = TNL_CONTEXT(ctx);
-   GLuint last_prim = tnl->vtx.prim[tnl->vtx.prim_count-1].mode;
-   GLuint last_count = tnl->vtx.prim[tnl->vtx.prim_count-1].count;
+   
 
-   if (ctx->Driver.CurrentExecPrimitive != GL_POLYGON+1) {
-      GLint i = tnl->vtx.prim_count - 1;
-      assert(i >= 0);
-      tnl->vtx.prim[i].count = ((tnl->vtx.initial_counter - tnl->vtx.counter) - 
-				tnl->vtx.prim[i].start);
+   if (tnl->vtx.prim_count == 0) {
+      tnl->vtx.copied.nr = 0;
+      tnl->vtx.counter = tnl->vtx.initial_counter;
+      tnl->vtx.vbptr = tnl->vtx.buffer;
    }
+   else {
+      GLuint last_prim = tnl->vtx.prim[tnl->vtx.prim_count-1].mode;
+      GLuint last_count = tnl->vtx.prim[tnl->vtx.prim_count-1].count;
+
+      if (ctx->Driver.CurrentExecPrimitive != GL_POLYGON+1) {
+	 GLint i = tnl->vtx.prim_count - 1;
+	 assert(i >= 0);
+	 tnl->vtx.prim[i].count = ((tnl->vtx.initial_counter - 
+				    tnl->vtx.counter) - 
+				   tnl->vtx.prim[i].start);
+      }
 
-   /* Execute the buffer and save copied vertices.
-    */
-   _tnl_flush_vtx( ctx );
+      /* Execute the buffer and save copied vertices.
+       */
+      if (tnl->vtx.counter != tnl->vtx.initial_counter)
+	 _tnl_flush_vtx( ctx );
+      else {
+	 tnl->vtx.prim_count = 0;
+	 tnl->vtx.copied.nr = 0;
+      }
 
-   /* Emit a glBegin to start the new list.
-    */
-   assert(tnl->vtx.prim_count == 0);
+      /* Emit a glBegin to start the new list.
+       */
+      assert(tnl->vtx.prim_count == 0);
 
-   if (ctx->Driver.CurrentExecPrimitive != GL_POLYGON+1) {
-      tnl->vtx.prim[0].mode = ctx->Driver.CurrentExecPrimitive;
-      tnl->vtx.prim[0].start = 0;
-      tnl->vtx.prim[0].count = 0;
-      tnl->vtx.prim_count++;
+      if (ctx->Driver.CurrentExecPrimitive != GL_POLYGON+1) {
+	 tnl->vtx.prim[0].mode = ctx->Driver.CurrentExecPrimitive;
+	 tnl->vtx.prim[0].start = 0;
+	 tnl->vtx.prim[0].count = 0;
+	 tnl->vtx.prim_count++;
       
-      if (tnl->vtx.copied.nr == last_count)
-	 tnl->vtx.prim[0].mode |= last_prim & PRIM_BEGIN;
+	 if (tnl->vtx.copied.nr == last_count)
+	    tnl->vtx.prim[0].mode |= last_prim & PRIM_BEGIN;
+      }
    }
 }
 
@@ -98,7 +113,8 @@ static void _tnl_wrap_filled_vertex( GLcontext *ctx )
    assert(tnl->vtx.counter > tnl->vtx.copied.nr);
 
    for (i = 0 ; i < tnl->vtx.copied.nr ; i++) {
-      _mesa_memcpy( tnl->vtx.vbptr, data, tnl->vtx.vertex_size * sizeof(GLfloat));
+      _mesa_memcpy( tnl->vtx.vbptr, data, 
+		    tnl->vtx.vertex_size * sizeof(GLfloat));
       tnl->vtx.vbptr += tnl->vtx.vertex_size;
       data += tnl->vtx.vertex_size;
       tnl->vtx.counter--;
@@ -191,6 +207,7 @@ static void _tnl_wrap_upgrade_vertex( GLcontext *ctx,
     */
    _tnl_wrap_buffers( ctx );
 
+
    /* Do a COPY_TO_CURRENT to ensure back-copying works for the case
     * when the attribute already exists in the vertex and is having
     * its size increased.  
-- 
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