patch to import Jon Smirl's work from Bitkeeper

1 files changed, 949 insertions, 0 deletions

diff --git a/src/mesa/tnl_dd/t_dd_dmatmp2.h b/src/mesa/tnl_dd/t_dd_dmatmp2.h
new file mode 100644
index 0000000000..3f58d24c95
--- /dev/null
+++ b/src/mesa/tnl_dd/t_dd_dmatmp2.h
@@ -0,0 +1,949 @@
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  4.0.3
+ *
+ * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+
+/* Template for render stages which build and emit vertices directly
+ * to fixed-size dma buffers.  Useful for rendering strips and other
+ * native primitives where clipping and per-vertex tweaks such as
+ * those in t_dd_tritmp.h are not required.
+ *
+ */
+
+#if !HAVE_TRIANGLES || !HAVE_POINTS || !HAVE_LINES
+#error "must have points, lines & triangles to use render template"
+#endif
+
+#if !HAVE_TRI_STRIPS || !HAVE_TRI_FANS
+#error "must have tri strip and fans to use render template"
+#endif
+
+#if !HAVE_LINE_STRIPS
+#error "must have line strips to use render template"
+#endif
+
+#if !HAVE_POLYGONS
+#error "must have polygons to use render template"
+#endif
+
+#if !HAVE_ELTS
+#error "must have elts to use render template"
+#endif
+
+
+#ifndef EMIT_TWO_ELTS
+#define EMIT_TWO_ELTS( dest, offset, elt0, elt1 )	\
+do { 						\
+   (dest)[offset] = (elt0); 			\
+   (dest)[offset+1] = (elt1); 			\
+} while (0)
+#endif
+
+
+/**********************************************************************/
+/*                  Render whole begin/end objects                    */
+/**********************************************************************/
+
+
+static ELT_TYPE *TAG(emit_elts)( GLcontext *ctx, 
+			    ELT_TYPE *dest,
+			    GLuint *elts, GLuint nr )
+{
+   GLint i;
+   LOCAL_VARS;
+
+   for ( i = 0 ; i+1 < nr ; i+=2, elts += 2 ) {
+      EMIT_TWO_ELTS( dest, 0, elts[0], elts[1] );
+      dest += 2;
+   }
+   if (i < nr) {
+      EMIT_ELT( dest, 0, elts[0] );
+      dest += 1;
+   }
+   
+   return dest;
+}
+
+static ELT_TYPE *TAG(emit_consecutive_elts)( GLcontext *ctx, 
+					ELT_TYPE *dest,
+					GLuint start, GLuint nr )
+{
+   GLint i;
+   LOCAL_VARS;
+
+   for ( i = 0 ; i+1 < nr ; i+=2, start += 2 ) {
+      EMIT_TWO_ELTS( dest, 0, start, start+1 );
+      dest += 2;
+   }
+   if (i < nr) {
+      EMIT_ELT( dest, 0, start );
+      dest += 1;
+   }
+
+   return dest;
+}
+
+/***********************************************************************
+ *                    Render non-indexed primitives.
+ ***********************************************************************/
+
+
+
+static void TAG(render_points_verts)( GLcontext *ctx,
+				      GLuint start,
+				      GLuint count,
+				      GLuint flags )
+{
+   if (start < count) {
+      LOCAL_VARS;
+      if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+      EMIT_PRIM( ctx, GL_POINTS, HW_POINTS, start, count );
+   }
+}
+
+static void TAG(render_lines_verts)( GLcontext *ctx,
+				     GLuint start,
+				     GLuint count,
+				     GLuint flags )
+{
+   LOCAL_VARS;
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+   count -= (count-start) & 1;
+
+   if (start+1 >= count)
+      return;
+
+   if ((flags & PRIM_BEGIN) && ctx->Line.StippleFlag) {
+      RESET_STIPPLE();
+      AUTO_STIPPLE( GL_TRUE );
+   }
+      
+   EMIT_PRIM( ctx, GL_LINES, HW_LINES, start, count );
+
+   if ((flags & PRIM_END) && ctx->Line.StippleFlag)
+      AUTO_STIPPLE( GL_FALSE );
+}
+
+
+static void TAG(render_line_strip_verts)( GLcontext *ctx,
+					  GLuint start,
+					  GLuint count,
+					  GLuint flags )
+{
+   LOCAL_VARS;
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+
+   if (start+1 >= count)
+      return;
+
+   if ((flags & PRIM_BEGIN) && ctx->Line.StippleFlag)
+      RESET_STIPPLE();
+
+
+   if (PREFER_DISCRETE_ELT_PRIM( count-start, HW_LINES ))
+   {   
+      int dmasz = GET_MAX_HW_ELTS();
+      GLuint j, nr;
+
+      ELT_INIT( GL_LINES, HW_LINES );
+
+      /* Emit whole number of lines in each full buffer.
+       */
+      dmasz = dmasz/2;
+
+
+      for (j = start; j + 1 < count; j += nr - 1 ) {
+	 ELT_TYPE *dest;
+	 GLint i;
+
+	 nr = MIN2( dmasz, count - j );
+	 dest = ALLOC_ELTS( (nr-1)*2 );
+	    
+	 for ( i = j ; i+1 < j+nr ; i+=1 ) {
+	    EMIT_TWO_ELTS( dest, 0, (i+0), (i+1) );
+	    dest += 2;
+	 }
+
+	 CLOSE_ELTS();
+      }
+   }
+   else
+      EMIT_PRIM( ctx, GL_LINE_STRIP, HW_LINE_STRIP, start, count );
+}
+
+
+static void TAG(render_line_loop_verts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   LOCAL_VARS;
+   GLuint j, nr;
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+
+   if (flags & PRIM_BEGIN) {
+      j = start;
+      if (ctx->Line.StippleFlag)
+	 RESET_STIPPLE( );
+   }
+   else
+      j = start + 1;
+
+   if (flags & PRIM_END) {
+
+      if (start+1 >= count)
+	 return;
+
+      if (PREFER_DISCRETE_ELT_PRIM( count-start, HW_LINES )) {
+	 int dmasz = GET_MAX_HW_ELTS();
+
+	 ELT_INIT( GL_LINES, HW_LINES );
+
+	 /* Emit whole number of lines in each full buffer.
+	  */
+	 dmasz = dmasz/2;
+
+	 /* Ensure last vertex doesn't wrap:
+	  */
+	 dmasz--;
+
+	 for (; j + 1 < count;  ) {
+	    GLint i;
+	    ELT_TYPE *dest;
+
+	    nr = MIN2( dmasz, count - j );
+	    dest = ALLOC_ELTS( nr*2 );	/* allocs room for 1 more line */
+
+	    for ( i = 0 ; i < nr - 1 ; i+=1 ) {
+	       EMIT_TWO_ELTS( dest, 0, (j+i), (j+i+1) );
+	       dest += 2;
+	    }
+
+	    j += nr - 1;
+
+	    /* Emit 1 more line into space alloced above */
+	    if (j + 1 >= count) {
+ 	       EMIT_TWO_ELTS( dest, 0, (j), (start) ); 
+ 	       dest += 2; 
+ 	    }
+ 
+	    CLOSE_ELTS();
+	 }
+      }
+      else
+      {
+	 int dmasz = GET_MAX_HW_ELTS() - 1;
+
+	 ELT_INIT( GL_LINE_STRIP, HW_LINE_STRIP );
+
+	 for ( ; j + 1 < count;  ) {
+	    nr = MIN2( dmasz, count - j );
+	    if (j + nr < count) {
+	       ELT_TYPE *dest = ALLOC_ELTS( nr );
+	       dest = TAG(emit_consecutive_elts)( ctx, dest, j, nr );
+	       j += nr - 1;
+	       CLOSE_ELTS();
+	    }
+	    else if (nr) {
+	       ELT_TYPE *dest = ALLOC_ELTS( nr + 1 );
+	       dest = TAG(emit_consecutive_elts)( ctx, dest, j, nr );
+	       dest = TAG(emit_consecutive_elts)( ctx, dest, start, 1 );
+	       j += nr;
+	       CLOSE_ELTS();
+	    }
+	 }   
+      }
+   } else {
+      TAG(render_line_strip_verts)( ctx, j, count, flags );
+   }
+}
+
+
+static void TAG(render_triangles_verts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   LOCAL_VARS;
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+
+   count -= (count-start)%3;
+
+   if (start+2 >= count) {
+      return;
+   }
+
+   /* need a PREFER_DISCRETE_ELT_PRIM here too..
+    */
+   EMIT_PRIM( ctx, GL_TRIANGLES, HW_TRIANGLES, start, count );
+}
+
+
+
+static void TAG(render_tri_strip_verts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   LOCAL_VARS;
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+
+   if (start + 2 >= count)
+      return;
+
+   if (PREFER_DISCRETE_ELT_PRIM( count-start, HW_TRIANGLES ))
+   {   
+      int dmasz = GET_MAX_HW_ELTS();
+      int parity = 0;
+      GLuint j, nr;
+
+      ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );
+
+      if (flags & PRIM_PARITY)
+	 parity = 1;
+
+      /* Emit even number of tris in each full buffer.
+       */
+      dmasz = dmasz/3;
+      dmasz -= dmasz & 1;
+
+      for (j = start; j + 2 < count; j += nr - 2 ) {
+	 ELT_TYPE *dest;
+	 GLint i;
+
+	 nr = MIN2( dmasz, count - j );
+	 dest = ALLOC_ELTS( (nr-2)*3 );
+	    
+	 for ( i = j ; i+2 < j+nr ; i++, parity^=1 ) {
+	    EMIT_ELT( dest, 0, (i+0+parity) );
+	    EMIT_ELT( dest, 1, (i+1-parity) );
+	    EMIT_ELT( dest, 2, (i+2) );
+	    dest += 3;
+	 }
+
+	 CLOSE_ELTS();
+      }
+   }
+   else if ((flags & PRIM_PARITY) == 0)  
+      EMIT_PRIM( ctx, GL_TRIANGLE_STRIP, HW_TRIANGLE_STRIP_0, start, count );
+   else if (HAVE_TRI_STRIP_1)
+      EMIT_PRIM( ctx, GL_TRIANGLE_STRIP, HW_TRIANGLE_STRIP_1, start, count );
+   else {
+      /* Emit the first triangle with elts, then the rest as a regular strip.
+       * TODO:  Make this unlikely in t_imm_api.c
+       */
+      ELT_TYPE *dest;
+
+      ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );
+      dest = ALLOC_ELTS( 3 );
+      EMIT_ELT( dest, 0, (start+1) );
+      EMIT_ELT( dest, 1, (start+0) );
+      EMIT_ELT( dest, 2, (start+2) );
+      dest += 3;
+      CLOSE_ELTS();
+
+      start++;
+      if (start + 2 >= count)
+	 return;
+
+      EMIT_PRIM( ctx, GL_TRIANGLE_STRIP, HW_TRIANGLE_STRIP_0, start, 
+		 count );
+   }
+}
+
+static void TAG(render_tri_fan_verts)( GLcontext *ctx,
+				       GLuint start,
+				       GLuint count,
+				       GLuint flags )
+{
+   LOCAL_VARS;
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+
+   if (start+2 >= count) 
+      return;
+
+   if (PREFER_DISCRETE_ELT_PRIM( count-start, HW_TRIANGLES ))
+   {   
+      int dmasz = GET_MAX_HW_ELTS();
+      GLuint j, nr;
+
+      ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );
+
+      dmasz = dmasz/3;
+
+      for (j = start + 1; j + 1 < count; j += nr - 1 ) {
+	 ELT_TYPE *dest;
+	 GLint i;
+
+	 nr = MIN2( dmasz, count - j );
+	 dest = ALLOC_ELTS( (nr-1)*3 );
+	    
+	 for ( i = j ; i+1 < j+nr ; i++ ) {
+	    EMIT_ELT( dest, 0, (start) );
+	    EMIT_ELT( dest, 1, (i) );
+	    EMIT_ELT( dest, 2, (i+1) );
+	    dest += 3;
+	 }
+	 
+	 CLOSE_ELTS();
+      }
+   }
+   else {
+      EMIT_PRIM( ctx, GL_TRIANGLE_FAN, HW_TRIANGLE_FAN, start, count );
+   }
+}
+
+
+static void TAG(render_poly_verts)( GLcontext *ctx,
+				    GLuint start,
+				    GLuint count,
+				    GLuint flags )
+{
+   LOCAL_VARS;
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+
+   if (start+2 >= count) 
+      return;
+
+   EMIT_PRIM( ctx, GL_POLYGON, HW_POLYGON, start, count );
+}
+
+static void TAG(render_quad_strip_verts)( GLcontext *ctx,
+					  GLuint start,
+					  GLuint count,
+					  GLuint flags )
+{
+   LOCAL_VARS;
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+
+   count -= (count-start) & 1;
+
+   if (start+3 >= count) 
+      return;
+
+   if (HAVE_QUAD_STRIPS) {
+      EMIT_PRIM( ctx, GL_QUAD_STRIP, HW_QUAD_STRIP, start, count );
+   } 
+   else if (ctx->_TriangleCaps & DD_FLATSHADE) {
+      LOCAL_VARS;
+      int dmasz = GET_MAX_HW_ELTS();
+      GLuint j, nr;
+
+      ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );
+
+      /* Emit whole number of quads in total, and in each buffer.
+       */
+      dmasz = (dmasz/6)*2;
+
+      for (j = start; j + 3 < count; j += nr - 2 ) {
+	 ELT_TYPE *dest;
+	 GLint quads, i;
+
+	 nr = MIN2( dmasz, count - j );
+	 quads = (nr/2)-1;
+	 dest = ALLOC_ELTS( quads*6 );
+	    
+	 for ( i = j ; i < j+quads*2 ; i+=2 ) {
+	    EMIT_TWO_ELTS( dest, 0, (i+0), (i+1) );
+	    EMIT_TWO_ELTS( dest, 2, (i+2), (i+1) );
+	    EMIT_TWO_ELTS( dest, 4, (i+3), (i+2) );
+	    dest += 6;
+	 }
+
+	 CLOSE_ELTS();
+      }
+   }
+   else {
+      EMIT_PRIM( ctx, GL_TRIANGLE_STRIP, HW_TRIANGLE_STRIP_0, start, count );
+   }
+}
+
+
+static void TAG(render_quads_verts)( GLcontext *ctx,
+				     GLuint start,
+				     GLuint count,
+				     GLuint flags )
+{
+   LOCAL_VARS;
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+   count -= (count-start)%4;
+
+   if (start+3 >= count) 
+      return;
+
+   if (HAVE_QUADS) {
+      EMIT_PRIM( ctx, HW_QUADS, GL_QUADS, start, count );
+   } 
+   else {
+      /* Hardware doesn't have a quad primitive type -- simulate it
+       * using indexed vertices and the triangle primitive: 
+       */
+      LOCAL_VARS;
+      int dmasz = GET_MAX_HW_ELTS();
+      GLuint j, nr;
+
+      ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );
+
+      /* Adjust for rendering as triangles:
+       */
+      dmasz = (dmasz/6)*4;
+
+      for (j = start; j < count; j += nr ) {
+	 ELT_TYPE *dest;
+	 GLint quads, i;
+
+	 nr = MIN2( dmasz, count - j );
+	 quads = nr/4;
+	 dest = ALLOC_ELTS( quads*6 );
+
+	 for ( i = j ; i < j+quads*4 ; i+=4 ) {
+	    EMIT_TWO_ELTS( dest, 0, (i+0), (i+1) );
+	    EMIT_TWO_ELTS( dest, 2, (i+3), (i+1) );
+	    EMIT_TWO_ELTS( dest, 4, (i+2), (i+3) );
+	    dest += 6;
+	 }
+
+	 CLOSE_ELTS();
+      }
+   }
+}
+
+static void TAG(render_noop)( GLcontext *ctx,
+			      GLuint start,
+			      GLuint count,
+			      GLuint flags )
+{
+}
+
+
+
+
+static render_func TAG(render_tab_verts)[GL_POLYGON+2] =
+{
+   TAG(render_points_verts),
+   TAG(render_lines_verts),
+   TAG(render_line_loop_verts),
+   TAG(render_line_strip_verts),
+   TAG(render_triangles_verts),
+   TAG(render_tri_strip_verts),
+   TAG(render_tri_fan_verts),
+   TAG(render_quads_verts),
+   TAG(render_quad_strip_verts),
+   TAG(render_poly_verts),
+   TAG(render_noop),
+};
+
+
+/****************************************************************************
+ *                 Render elts using hardware indexed verts                 *
+ ****************************************************************************/
+
+static void TAG(render_points_elts)( GLcontext *ctx,
+				     GLuint start,
+				     GLuint count,
+				     GLuint flags )
+{
+   LOCAL_VARS;
+   int dmasz = GET_MAX_HW_ELTS();
+   GLuint *elts = GET_MESA_ELTS();
+   GLuint j, nr;
+   ELT_TYPE *dest;
+
+   ELT_INIT( GL_POINTS, HW_POINTS );
+
+   for (j = start; j < count; j += nr ) {
+      nr = MIN2( dmasz, count - j );
+      dest = ALLOC_ELTS( nr );
+      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
+      CLOSE_ELTS();
+   }
+}
+
+
+
+static void TAG(render_lines_elts)( GLcontext *ctx,
+				    GLuint start,
+				    GLuint count,
+				    GLuint flags )
+{
+   LOCAL_VARS;
+   int dmasz = GET_MAX_HW_ELTS();
+   GLuint *elts = GET_MESA_ELTS();
+   GLuint j, nr;
+   ELT_TYPE *dest;
+
+   if (start+1 >= count)
+      return;
+
+   if ((flags & PRIM_BEGIN) && ctx->Line.StippleFlag) {
+      RESET_STIPPLE();
+      AUTO_STIPPLE( GL_TRUE );
+   }
+
+   ELT_INIT( GL_LINES, HW_LINES );
+
+   /* Emit whole number of lines in total and in each buffer:
+    */
+   count -= (count-start) & 1;
+   dmasz -= dmasz & 1;
+
+   for (j = start; j < count; j += nr ) {
+      nr = MIN2( dmasz, count - j );
+      dest = ALLOC_ELTS( nr );
+      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
+      CLOSE_ELTS();
+   }
+
+   if ((flags & PRIM_END) && ctx->Line.StippleFlag)
+      AUTO_STIPPLE( GL_FALSE );
+}
+
+
+static void TAG(render_line_strip_elts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   LOCAL_VARS;
+   int dmasz = GET_MAX_HW_ELTS();
+   GLuint *elts = GET_MESA_ELTS();
+   GLuint j, nr;
+   ELT_TYPE *dest;
+
+   if (start+1 >= count)
+      return;
+
+   ELT_INIT( GL_LINE_STRIP, HW_LINE_STRIP );
+
+   if ((flags & PRIM_BEGIN) && ctx->Line.StippleFlag)
+      RESET_STIPPLE();
+
+   for (j = start; j + 1 < count; j += nr - 1 ) {
+      nr = MIN2( dmasz, count - j );
+      dest = ALLOC_ELTS( nr );
+      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
+      CLOSE_ELTS();
+   }
+}
+
+
+static void TAG(render_line_loop_elts)( GLcontext *ctx,
+					GLuint start,
+					GLuint count,
+					GLuint flags )
+{
+   LOCAL_VARS;
+   int dmasz = GET_MAX_HW_ELTS();
+   GLuint *elts = GET_MESA_ELTS();
+   GLuint j, nr;
+   ELT_TYPE *dest;
+
+   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
+
+   if (flags & PRIM_BEGIN)
+      j = start;
+   else
+      j = start + 1;
+
+   
+   if (flags & PRIM_END) {
+      if (start+1 >= count)
+	 return;
+   } 
+   else {
+      if (j+1 >= count)
+	 return;
+   }
+
+   ELT_INIT( GL_LINE_STRIP, HW_LINE_STRIP );
+
+   if ((flags & PRIM_BEGIN) && ctx->Line.StippleFlag)
+      RESET_STIPPLE();
+
+   
+   /* Ensure last vertex doesn't wrap:
+    */
+   dmasz--;
+
+   for ( ; j + 1 < count; ) {
+      nr = MIN2( dmasz, count - j );
+      dest = ALLOC_ELTS( nr+1 );	/* Reserve possible space for last elt */
+      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
+      j += nr - 1;
+      if (j + 1 >= count && (flags & PRIM_END)) {
+	 dest = TAG(emit_elts)( ctx, dest, elts+start, 1 );
+      }
+      CLOSE_ELTS();
+   }
+}
+
+
+static void TAG(render_triangles_elts)( GLcontext *ctx,
+					GLuint start,
+					GLuint count,
+					GLuint flags )
+{
+   LOCAL_VARS;
+   GLuint *elts = GET_MESA_ELTS();
+   int dmasz = GET_MAX_HW_ELTS()/3*3;
+   GLuint j, nr;
+   ELT_TYPE *dest;
+
+   if (start+2 >= count)
+      return;
+
+   ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );
+
+
+   /* Emit whole number of tris in total.  dmasz is already a multiple
+    * of 3.
+    */
+   count -= (count-start)%3;
+
+   for (j = start; j < count; j += nr) {
+      nr = MIN2( dmasz, count - j );
+      dest = ALLOC_ELTS( nr );
+      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
+      CLOSE_ELTS();
+   }
+}
+
+
+
+static void TAG(render_tri_strip_elts)( GLcontext *ctx,
+					GLuint start,
+					GLuint count,
+					GLuint flags )
+{
+   LOCAL_VARS;
+   GLuint j, nr;
+   GLuint *elts = GET_MESA_ELTS();
+   int dmasz = GET_MAX_HW_ELTS();
+   ELT_TYPE *dest;
+
+   if (start+2 >= count)
+      return;
+
+   ELT_INIT( GL_TRIANGLE_STRIP, HW_TRIANGLE_STRIP_0 );
+
+   /* Keep the same winding over multiple buffers:
+    */
+   dmasz -= (dmasz & 1);
+
+   for (j = start ; j + 2 < count; j += nr - 2 ) {
+      nr = MIN2( dmasz, count - j );
+
+      if (flags & PRIM_PARITY) {
+	 dest = ALLOC_ELTS( nr );	
+	 dest = TAG(emit_elts)( ctx, dest, elts+j, 1 );
+	 dest = TAG(emit_elts)( ctx, dest, elts+j, nr-1 );
+	 nr--; flags &= ~PRIM_PARITY;
+	 CLOSE_ELTS();
+      }
+      else {
+	 dest = ALLOC_ELTS( nr );
+	 dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
+	 CLOSE_ELTS();
+      }
+   }
+}
+
+static void TAG(render_tri_fan_elts)( GLcontext *ctx,
+				      GLuint start,
+				      GLuint count,
+				      GLuint flags )
+{
+   LOCAL_VARS;
+   GLuint *elts = GET_MESA_ELTS();
+   GLuint j, nr;
+   int dmasz = GET_MAX_HW_ELTS();
+   ELT_TYPE *dest;
+
+   if (start+2 >= count)
+      return;
+
+   ELT_INIT( GL_TRIANGLE_FAN, HW_TRIANGLE_FAN );
+
+   for (j = start + 1 ; j + 1 < count; j += nr - 1 ) {
+      nr = MIN2( dmasz, count - j + 1 );
+      dest = ALLOC_ELTS( nr );
+      dest = TAG(emit_elts)( ctx, dest, elts+start, 1 );
+      dest = TAG(emit_elts)( ctx, dest, elts+j, nr - 1 );
+      CLOSE_ELTS();
+   }
+}
+
+
+static void TAG(render_poly_elts)( GLcontext *ctx,
+				   GLuint start,
+				   GLuint count,
+				   GLuint flags )
+{
+   LOCAL_VARS;
+   GLuint *elts = GET_MESA_ELTS();
+   GLuint j, nr;
+   int dmasz = GET_MAX_HW_ELTS();
+   ELT_TYPE *dest;
+
+   if (start+2 >= count)
+      return;
+
+   ELT_INIT( GL_POLYGON, HW_POLYGON );
+
+   for (j = start + 1 ; j + 1 < count ; j += nr - 1 ) {
+      nr = MIN2( dmasz, count - j + 1 );
+      dest = ALLOC_ELTS( nr );
+      dest = TAG(emit_elts)( ctx, dest, elts+start, 1 );
+      dest = TAG(emit_elts)( ctx, dest, elts+j, nr - 1 );
+      CLOSE_ELTS();
+   }
+}
+
+static void TAG(render_quad_strip_elts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   if (start+3 >= count)
+      return;
+
+   if (HAVE_QUAD_STRIPS && 0) {
+   }
+   else {
+      LOCAL_VARS;
+      GLuint *elts = GET_MESA_ELTS();
+      int dmasz = GET_MAX_HW_ELTS();
+      GLuint j, nr;
+      ELT_TYPE *dest;
+
+      /* Emit whole number of quads in total, and in each buffer.
+       */
+      dmasz -= dmasz & 1;
+      count -= (count-start) & 1;
+
+      if (ctx->_TriangleCaps & DD_FLATSHADE) {
+	 ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );
+
+	 dmasz = dmasz/6*2;
+
+	 for (j = start; j + 3 < count; j += nr - 2 ) {
+	    nr = MIN2( dmasz, count - j );
+
+	    if (nr >= 4)
+	    {
+	       GLint quads = (nr/2)-1;
+	       ELT_TYPE *dest = ALLOC_ELTS( quads*6 );
+	       GLint i;
+
+	       for ( i = j-start ; i < j-start+quads ; i++, elts += 2 ) {
+		  EMIT_TWO_ELTS( dest, 0, elts[0], elts[1] );
+		  EMIT_TWO_ELTS( dest, 2, elts[2], elts[1] );
+		  EMIT_TWO_ELTS( dest, 4, elts[3], elts[2] );
+		  dest += 6;
+	       }
+
+	       CLOSE_ELTS();
+	    }
+	 }
+      }
+      else {
+	 ELT_INIT( GL_TRIANGLE_STRIP, HW_TRIANGLE_STRIP_0 );
+
+	 for (j = start; j + 3 < count; j += nr - 2 ) {
+	    nr = MIN2( dmasz, count - j );
+	    dest = ALLOC_ELTS( nr );
+	    dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
+	    CLOSE_ELTS();
+	 }
+      }
+   }
+}
+
+
+static void TAG(render_quads_elts)( GLcontext *ctx,
+				    GLuint start,
+				    GLuint count,
+				    GLuint flags )
+{
+   if (start+3 >= count)
+      return;
+
+   if (HAVE_QUADS && 0) {
+   } else {
+      LOCAL_VARS;
+      GLuint *elts = GET_MESA_ELTS();
+      int dmasz = GET_MAX_HW_ELTS();
+      GLuint j, nr;
+
+      ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );
+
+      /* Emit whole number of quads in total, and in each buffer.
+       */
+      dmasz -= dmasz & 3;
+      count -= (count-start) & 3;
+
+      /* Adjust for rendering as triangles:
+       */
+      dmasz = dmasz/6*4;
+
+      for (j = start; j + 3 < count; j += nr ) {
+	 nr = MIN2( dmasz, count - j );
+
+	 {
+	    GLint quads = nr/4;
+	    ELT_TYPE *dest = ALLOC_ELTS( quads * 6 );
+	    GLint i;
+
+	    for ( i = j-start ; i < j-start+quads ; i++, elts += 4 ) {
+	       EMIT_TWO_ELTS( dest, 0, elts[0], elts[1] );
+	       EMIT_TWO_ELTS( dest, 2, elts[3], elts[1] );
+	       EMIT_TWO_ELTS( dest, 4, elts[2], elts[3] );
+	       dest += 6;
+	    }
+
+	    CLOSE_ELTS();
+	 }
+      }
+   }
+}
+
+
+
+static render_func TAG(render_tab_elts)[GL_POLYGON+2] =
+{
+   TAG(render_points_elts),
+   TAG(render_lines_elts),
+   TAG(render_line_loop_elts),
+   TAG(render_line_strip_elts),
+   TAG(render_triangles_elts),
+   TAG(render_tri_strip_elts),
+   TAG(render_tri_fan_elts),
+   TAG(render_quads_elts),
+   TAG(render_quad_strip_elts),
+   TAG(render_poly_elts),
+   TAG(render_noop),
+};