patch to import Jon Smirl's work from Bitkeeper

1 files changed, 1105 insertions, 0 deletions

diff --git a/src/mesa/tnl_dd/t_dd_dmatmp.h b/src/mesa/tnl_dd/t_dd_dmatmp.h
new file mode 100644
index 0000000000..d9f709389d
--- /dev/null
+++ b/src/mesa/tnl_dd/t_dd_dmatmp.h
@@ -0,0 +1,1105 @@
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.5
+ *
+ * Copyright (C) 1999-2001  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.
+ *
+ * Produces code for both inline triangles and indexed triangles.
+ * Where various primitive types are unaccelerated by hardware, the
+ * code attempts to fallback to other primitive types (quadstrips to
+ * tristrips, lineloops to linestrips), or to indexed vertices.
+ * Ultimately, a FALLBACK() macro is invoked if there is no way to
+ * render the primitive natively.
+ */
+
+#if !defined(HAVE_TRIANGLES)
+#error "must have at least triangles to use render template"
+#endif
+
+#if !HAVE_ELTS
+#define ELTS_VARS
+#define ALLOC_ELTS( nr )
+#define EMIT_ELT( offset, elt )
+#define EMIT_TWO_ELTS( offset, elt0, elt1 )
+#define INCR_ELTS( nr )
+#define ELT_INIT(prim)
+#define GET_CURRENT_VB_MAX_ELTS() 0
+#define GET_SUBSEQUENT_VB_MAX_ELTS() 0
+#define ALLOC_ELTS_NEW_PRIMITIVE(nr)
+#define RELEASE_ELT_VERTS()
+#define EMIT_INDEXED_VERTS( ctx, start, count )
+#endif
+
+#ifndef EMIT_TWO_ELTS
+#define EMIT_TWO_ELTS( offset, elt0, elt1 )	\
+do { 						\
+   EMIT_ELT( offset, elt0 ); 			\
+   EMIT_ELT( offset+1, elt1 ); 			\
+} while (0)
+#endif
+
+#ifndef FINISH
+#define FINISH
+#endif
+
+/**********************************************************************/
+/*                  Render whole begin/end objects                    */
+/**********************************************************************/
+
+
+
+static GLboolean TAG(emit_elt_verts)( GLcontext *ctx,
+				      GLuint start, GLuint count )
+{
+   if (HAVE_ELTS) {
+      LOCAL_VARS;
+      GLuint nr = count - start;
+
+      if ( nr >= GET_SUBSEQUENT_VB_MAX_VERTS() ) /* assumes same packing for
+						  * indexed and regualar verts
+						  */
+	 return GL_FALSE;
+
+      NEW_PRIMITIVE(); /* finish last prim */
+      EMIT_INDEXED_VERTS( ctx, start, count );
+      return GL_TRUE;
+   } else {
+      return GL_FALSE;
+   }
+}
+
+#if (HAVE_ELTS)
+static void TAG(emit_elts)( GLcontext *ctx, GLuint *elts, GLuint nr )
+{
+   GLint i;
+   LOCAL_VARS;
+   ELTS_VARS;
+
+   ALLOC_ELTS( nr );
+
+   for ( i = 0 ; i < nr ; i+=2, elts += 2 ) {
+      EMIT_TWO_ELTS( 0, elts[0], elts[1] );
+      INCR_ELTS( 2 );
+   }
+}
+#endif
+
+
+/***********************************************************************
+ *                    Render non-indexed primitives.
+ ***********************************************************************/
+
+
+
+static void TAG(render_points_verts)( GLcontext *ctx,
+				      GLuint start,
+				      GLuint count,
+				      GLuint flags )
+{
+   if (HAVE_POINTS) {
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
+      int currentsz = GET_CURRENT_VB_MAX_VERTS();
+      GLuint j, nr;
+
+      INIT( GL_POINTS );
+
+      if (currentsz < 8)
+	 currentsz = dmasz;
+
+      for (j = start; j < count; j += nr ) {
+	 nr = MIN2( currentsz, count - j );
+	 EMIT_VERTS( ctx, j, nr );
+	 currentsz = dmasz;
+      }
+
+      FINISH;
+
+   } else {
+      VERT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+static void TAG(render_lines_verts)( GLcontext *ctx,
+				     GLuint start,
+				     GLuint count,
+				     GLuint flags )
+{
+   if (HAVE_LINES) {
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
+      int currentsz = GET_CURRENT_VB_MAX_VERTS();
+      GLuint j, nr;
+
+      INIT( GL_LINES );
+
+      /* Emit whole number of lines in total and in each buffer:
+       */
+      count -= (count-start) & 1;
+      currentsz -= currentsz & 1;
+      dmasz -= dmasz & 1;
+
+      if (currentsz < 8)
+	 currentsz = dmasz;
+
+      for (j = start; j < count; j += nr ) {
+	 nr = MIN2( currentsz, count - j );
+	 EMIT_VERTS( ctx, j, nr );
+	 currentsz = dmasz;
+      }
+
+      FINISH;
+
+   } else {
+      VERT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+static void TAG(render_line_strip_verts)( GLcontext *ctx,
+					  GLuint start,
+					  GLuint count,
+					  GLuint flags )
+{
+   if (HAVE_LINE_STRIPS) {
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
+      int currentsz = GET_CURRENT_VB_MAX_VERTS();
+      GLuint j, nr;
+
+      NEW_PRIMITIVE(); /* always a new primitive */
+      INIT( GL_LINE_STRIP );
+
+      if (currentsz < 8)
+	 currentsz = dmasz;
+
+      for (j = start; j + 1 < count; j += nr - 1 ) {
+	 nr = MIN2( currentsz, count - j );
+	 EMIT_VERTS( ctx, j, nr );
+	 currentsz = dmasz;
+      }
+ 
+      FINISH;
+
+   } else {
+      VERT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+static void TAG(render_line_loop_verts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   if (HAVE_LINE_STRIPS) {
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
+      int currentsz = GET_CURRENT_VB_MAX_VERTS();
+      GLuint j, nr;
+
+      NEW_PRIMITIVE();
+      INIT( GL_LINE_STRIP );
+
+      if (flags & PRIM_BEGIN)
+	 j = start;
+      else
+	 j = start + 1;
+
+      /* Ensure last vertex won't wrap buffers:
+       */
+      currentsz--;
+      dmasz--;
+
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      if (j + 1 < count) {
+	 for ( ; j + 1 < count; j += nr - 1 ) {
+	    nr = MIN2( currentsz, count - j );
+	    EMIT_VERTS( ctx, j, nr );
+	    currentsz = dmasz;
+	 }
+
+	 if (start < count - 1 && (flags & PRIM_END))
+	    EMIT_VERTS( ctx, start, 1 );
+      }
+      else if (start + 1 < count && (flags & PRIM_END)) {
+	 EMIT_VERTS( ctx, start+1, 1 );
+	 EMIT_VERTS( ctx, start, 1 );
+      }
+
+      FINISH;
+
+   } else {
+      VERT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+static void TAG(render_triangles_verts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   LOCAL_VARS;
+   int dmasz = (GET_SUBSEQUENT_VB_MAX_VERTS()/3) * 3;
+   int currentsz = (GET_CURRENT_VB_MAX_VERTS()/3) * 3;
+   GLuint j, nr;
+
+   INIT(GL_TRIANGLES);
+
+   /* Emit whole number of tris in total.  dmasz is already a multiple
+    * of 3.
+    */
+   count -= (count-start)%3;
+
+   if (currentsz < 8)
+      currentsz = dmasz;
+
+   for (j = start; j < count; j += nr) {
+      nr = MIN2( currentsz, count - j );
+      EMIT_VERTS( ctx, j, nr );
+      currentsz = dmasz;
+   }
+   FINISH;
+}
+
+
+
+static void TAG(render_tri_strip_verts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   if (HAVE_TRI_STRIPS) {
+      LOCAL_VARS;
+      GLuint j, nr;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
+      int currentsz;
+
+      INIT(GL_TRIANGLE_STRIP);
+      NEW_PRIMITIVE();
+
+      currentsz = GET_CURRENT_VB_MAX_VERTS();
+
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      if ((flags & PRIM_PARITY) && count - start > 2) {
+	 if (HAVE_TRI_STRIP_1 && 0) {
+	 } else {
+	    EMIT_VERTS( ctx, start, 1 );
+	    currentsz--;
+	 }
+      }
+
+      /* From here on emit even numbers of tris when wrapping over buffers:
+       */
+      dmasz -= (dmasz & 1);
+      currentsz -= (currentsz & 1);
+
+      for (j = start ; j + 2 < count; j += nr - 2 ) {
+	 nr = MIN2( currentsz, count - j );
+	 EMIT_VERTS( ctx, j, nr );
+	 currentsz = dmasz;
+      }
+
+      FINISH;
+
+   } else {
+      VERT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+static void TAG(render_tri_fan_verts)( GLcontext *ctx,
+				       GLuint start,
+				       GLuint count,
+				       GLuint flags )
+{
+   if (HAVE_TRI_FANS) {
+      LOCAL_VARS;
+      GLuint j, nr;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
+      int currentsz = GET_CURRENT_VB_MAX_VERTS();
+
+      NEW_PRIMITIVE();
+      INIT(GL_TRIANGLE_FAN);
+
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      for (j = start + 1 ; j + 1 < count; j += nr - 1 ) {
+	 nr = MIN2( currentsz, count - j + 1 );
+	 EMIT_VERTS( ctx, start, 1 );
+	 EMIT_VERTS( ctx, j, nr - 1 );
+	 currentsz = dmasz;
+      }
+
+      FINISH;
+
+   }
+   else {
+      /* Could write code to emit these as indexed vertices (for the
+       * g400, for instance).
+       */
+      VERT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+static void TAG(render_poly_verts)( GLcontext *ctx,
+				    GLuint start,
+				    GLuint count,
+				    GLuint flags )
+{
+   if (HAVE_POLYGONS) {
+      LOCAL_VARS;
+      GLuint j, nr;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
+      int currentsz = GET_CURRENT_VB_MAX_VERTS();
+
+      NEW_PRIMITIVE();
+      INIT(GL_POLYGON);
+
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      for (j = start + 1 ; j + 1 < count ; j += nr - 1 ) {
+	 nr = MIN2( currentsz, count - j + 1 );
+	 EMIT_VERTS( ctx, start, 1 );
+	 EMIT_VERTS( ctx, j, nr - 1 );
+	 currentsz = dmasz;
+      }
+
+      FINISH;
+
+   }
+   else if (HAVE_TRI_FANS && !(ctx->_TriangleCaps & DD_FLATSHADE)) {
+      TAG(render_tri_fan_verts)( ctx, start, count, flags );
+   } else {
+      VERT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+static void TAG(render_quad_strip_verts)( GLcontext *ctx,
+					  GLuint start,
+					  GLuint count,
+					  GLuint flags )
+{
+   GLuint j, nr;
+
+   if (HAVE_QUAD_STRIPS) {
+      LOCAL_VARS;
+      GLuint j, nr;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
+      int currentsz;
+
+      INIT(GL_QUAD_STRIP);
+      NEW_PRIMITIVE();
+
+      currentsz = GET_CURRENT_VB_MAX_VERTS();
+
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      dmasz -= (dmasz & 2);
+      currentsz -= (currentsz & 2);
+
+      for (j = start ; j + 3 < count; j += nr - 2 ) {
+	 nr = MIN2( currentsz, count - j );
+	 EMIT_VERTS( ctx, j, nr );
+	 currentsz = dmasz;
+      }
+
+      FINISH;
+
+   } else if (HAVE_TRI_STRIPS && (ctx->_TriangleCaps & DD_FLATSHADE)) {
+      if (TAG(emit_elt_verts)( ctx, start, count )) {
+	 LOCAL_VARS;
+	 int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+	 int currentsz;
+	 GLuint j, nr;
+
+	 /* Simulate flat-shaded quadstrips using indexed vertices:
+	  */
+	 NEW_PRIMITIVE();
+	 ELT_INIT( GL_TRIANGLES );
+
+	 currentsz = GET_CURRENT_VB_MAX_ELTS();
+
+	 /* Emit whole number of quads in total, and in each buffer.
+	  */
+	 dmasz -= dmasz & 1;
+	 count -= (count-start) & 1;
+	 currentsz -= currentsz & 1;
+
+	 if (currentsz < 12)
+	    currentsz = dmasz;
+
+	 currentsz = currentsz/6*2;
+	 dmasz = dmasz/6*2;
+
+	 for (j = start; j + 3 < count; j += nr - 2 ) {
+	    nr = MIN2( currentsz, count - j );
+	    if (nr >= 4) {
+	       GLint quads = (nr/2)-1;
+	       GLint i;
+	       ELTS_VARS;
+
+	       NEW_PRIMITIVE();
+	       ALLOC_ELTS_NEW_PRIMITIVE( quads*6 );
+
+	       for ( i = j-start ; i < j-start+quads*2 ; i+=2 ) {
+		  EMIT_TWO_ELTS( 0, (i+0), (i+1) );
+		  EMIT_TWO_ELTS( 2, (i+2), (i+1) );
+		  EMIT_TWO_ELTS( 4, (i+3), (i+2) );
+		  INCR_ELTS( 6 );
+	       }
+
+	       NEW_PRIMITIVE();
+	    }
+	    currentsz = dmasz;
+	 }
+
+	 RELEASE_ELT_VERTS();
+      }
+      else {
+	 /* Vertices won't fit in a single buffer or elts not available,
+	  * VERT_FALLBACK.
+	  */
+	 VERT_FALLBACK( ctx, start, count, flags );
+      }
+   }
+   else if (HAVE_TRI_STRIPS) {
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_VERTS();
+      int currentsz = GET_CURRENT_VB_MAX_VERTS();
+
+      /* Emit smooth-shaded quadstrips as tristrips:
+       */
+      NEW_PRIMITIVE();
+      INIT( GL_TRIANGLE_STRIP );
+
+      /* Emit whole number of quads in total, and in each buffer.
+       */
+      dmasz -= dmasz & 1;
+      currentsz -= currentsz & 1;
+      count -= (count-start) & 1;
+
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      for (j = start; j + 3 < count; j += nr - 2 ) {
+	 nr = MIN2( currentsz, count - j );
+	 EMIT_VERTS( ctx, j, nr );
+	 currentsz = dmasz;
+      }
+
+      FINISH;
+
+   } else {
+      VERT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+static void TAG(render_quads_verts)( GLcontext *ctx,
+				     GLuint start,
+				     GLuint count,
+				     GLuint flags )
+{
+   if (HAVE_QUADS) {
+      LOCAL_VARS;
+      int dmasz = (GET_SUBSEQUENT_VB_MAX_VERTS()/4) * 4;
+      int currentsz = (GET_CURRENT_VB_MAX_VERTS()/4) * 4;
+      GLuint j, nr;
+
+      INIT(GL_QUADS);
+
+      /* Emit whole number of quads in total.  dmasz is already a multiple
+       * of 4.
+       */
+      count -= (count-start)%4;
+
+      if (currentsz < 8)
+         currentsz = dmasz;
+
+      for (j = start; j < count; j += nr) {
+         nr = MIN2( currentsz, count - j );
+         EMIT_VERTS( ctx, j, nr );
+         currentsz = dmasz;
+      }
+      FINISH;
+   } else if (TAG(emit_elt_verts)( ctx, start, count )) {
+      /* Hardware doesn't have a quad primitive type -- try to
+       * simulate it using indexed vertices and the triangle
+       * primitive:
+       */
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+      GLuint j, nr;
+
+      NEW_PRIMITIVE();
+      ELT_INIT( GL_TRIANGLES );
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+
+      /* Emit whole number of quads in total, and in each buffer.
+       */
+      dmasz -= dmasz & 3;
+      count -= (count-start) & 3;
+      currentsz -= currentsz & 3;
+
+      /* Adjust for rendering as triangles:
+       */
+      currentsz = currentsz/6*4;
+      dmasz = dmasz/6*4;
+
+      if (currentsz < 8)
+	 currentsz = dmasz;
+
+      for (j = start; j < count; j += nr ) {
+	 nr = MIN2( currentsz, count - j );
+	 if (nr >= 4) {
+	    GLint quads = nr/4;
+	    GLint i;
+	    ELTS_VARS;
+
+	    NEW_PRIMITIVE();
+	    ALLOC_ELTS_NEW_PRIMITIVE( quads*6 );
+
+	    for ( i = j-start ; i < j-start+quads*4 ; i+=4 ) {
+	       EMIT_TWO_ELTS( 0, (i+0), (i+1) );
+	       EMIT_TWO_ELTS( 2, (i+3), (i+1) );
+	       EMIT_TWO_ELTS( 4, (i+2), (i+3) );
+	       INCR_ELTS( 6 );
+	    }
+
+	    NEW_PRIMITIVE();
+	 }
+	 currentsz = dmasz;
+      }
+
+      RELEASE_ELT_VERTS();
+   }
+   else {
+      /* Vertices won't fit in a single buffer, fallback.
+       */
+      VERT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+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                 *
+ ****************************************************************************/
+
+#if (HAVE_ELTS)
+static void TAG(render_points_elts)( GLcontext *ctx,
+				     GLuint start,
+				     GLuint count,
+				     GLuint flags )
+{
+   if (HAVE_POINTS) {
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+      GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+      GLuint j, nr;
+
+      ELT_INIT( GL_POINTS );
+
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+      if (currentsz < 8)
+	 currentsz = dmasz;
+
+      for (j = start; j < count; j += nr ) {
+	 nr = MIN2( currentsz, count - j );
+	 TAG(emit_elts)( ctx, elts+j, nr );
+	 NEW_PRIMITIVE();
+	 currentsz = dmasz;
+      }
+   } else {
+      ELT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+
+static void TAG(render_lines_elts)( GLcontext *ctx,
+				    GLuint start,
+				    GLuint count,
+				    GLuint flags )
+{
+   if (HAVE_LINES) {
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+      GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+      GLuint j, nr;
+
+      ELT_INIT( GL_LINES );
+
+      /* Emit whole number of lines in total and in each buffer:
+       */
+      count -= (count-start) & 1;
+      currentsz -= currentsz & 1;
+      dmasz -= dmasz & 1;
+
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+      if (currentsz < 8)
+	 currentsz = dmasz;
+
+      for (j = start; j < count; j += nr ) {
+	 nr = MIN2( currentsz, count - j );
+	 TAG(emit_elts)( ctx, elts+j, nr );
+	 NEW_PRIMITIVE();
+	 currentsz = dmasz;
+      }
+   } else {
+      ELT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+static void TAG(render_line_strip_elts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   if (HAVE_LINE_STRIPS) {
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+      GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+      GLuint j, nr;
+
+      NEW_PRIMITIVE(); /* always a new primitive */
+      ELT_INIT( GL_LINE_STRIP );
+
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+      if (currentsz < 8)
+	 currentsz = dmasz;
+
+      for (j = start; j + 1 < count; j += nr - 1 ) {
+	 nr = MIN2( currentsz, count - j );
+	 TAG(emit_elts)( ctx, elts+j, nr );
+	 NEW_PRIMITIVE();
+	 currentsz = dmasz;
+      }
+   } else {
+      /* TODO: Try to emit as indexed lines.
+       */
+      ELT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+static void TAG(render_line_loop_elts)( GLcontext *ctx,
+					GLuint start,
+					GLuint count,
+					GLuint flags )
+{
+   if (HAVE_LINE_STRIPS) {
+      LOCAL_VARS;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+      GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+      GLuint j, nr;
+
+      NEW_PRIMITIVE();
+      ELT_INIT( GL_LINE_STRIP );
+
+      if (flags & PRIM_BEGIN)
+	 j = start;
+      else
+	 j = start + 1;
+
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      /* Ensure last vertex doesn't wrap:
+       */
+      currentsz--;
+      dmasz--;
+
+      for ( ; j + 1 < count; j += nr - 1 ) {
+	 nr = MIN2( currentsz, count - j );
+/*  	 NEW_PRIMITIVE(); */
+	 TAG(emit_elts)( ctx, elts+j, nr );
+	 currentsz = dmasz;
+      }
+
+      if (flags & PRIM_END)
+	 TAG(emit_elts)( ctx, elts+start, 1 );
+
+      NEW_PRIMITIVE();
+   } else {
+      /* TODO: Try to emit as indexed lines */
+      ELT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+/* For verts, we still eliminate the copy from main memory to dma
+ * buffers.  For elts, this is probably no better (worse?) than the
+ * standard path.
+ */
+static void TAG(render_triangles_elts)( GLcontext *ctx,
+					GLuint start,
+					GLuint count,
+					GLuint flags )
+{
+   LOCAL_VARS;
+   GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+   int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS()/3*3;
+   int currentsz;
+   GLuint j, nr;
+
+   NEW_PRIMITIVE();
+   ELT_INIT( GL_TRIANGLES );
+
+   currentsz = GET_CURRENT_VB_MAX_ELTS();
+
+   /* Emit whole number of tris in total.  dmasz is already a multiple
+    * of 3.
+    */
+   count -= (count-start)%3;
+   currentsz -= currentsz%3;
+   if (currentsz < 8)
+      currentsz = dmasz;
+
+   for (j = start; j < count; j += nr) {
+      nr = MIN2( currentsz, count - j );
+      TAG(emit_elts)( ctx, elts+j, nr );
+      NEW_PRIMITIVE();
+      currentsz = dmasz;
+   }
+}
+
+
+
+static void TAG(render_tri_strip_elts)( GLcontext *ctx,
+					GLuint start,
+					GLuint count,
+					GLuint flags )
+{
+   if (HAVE_TRI_STRIPS) {
+      LOCAL_VARS;
+      GLuint j, nr;
+      GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+
+      NEW_PRIMITIVE();
+      ELT_INIT( GL_TRIANGLE_STRIP );
+
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      if ((flags & PRIM_PARITY) && count - start > 2) {
+	 TAG(emit_elts)( ctx, elts+start, 1 );
+      }
+
+      /* Keep the same winding over multiple buffers:
+       */
+      dmasz -= (dmasz & 1);
+      currentsz -= (currentsz & 1);
+
+      for (j = start ; j + 2 < count; j += nr - 2 ) {
+	 nr = MIN2( currentsz, count - j );
+	 TAG(emit_elts)( ctx, elts+j, nr );
+	 NEW_PRIMITIVE();
+	 currentsz = dmasz;
+      }
+   } else {
+      /* TODO: try to emit as indexed triangles */
+      ELT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+static void TAG(render_tri_fan_elts)( GLcontext *ctx,
+				      GLuint start,
+				      GLuint count,
+				      GLuint flags )
+{
+   if (HAVE_TRI_FANS) {
+      LOCAL_VARS;
+      GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+      GLuint j, nr;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+
+      NEW_PRIMITIVE();
+      ELT_INIT( GL_TRIANGLE_FAN );
+
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      for (j = start + 1 ; j + 1 < count; j += nr - 1 ) {
+	 nr = MIN2( currentsz, count - j + 1 );
+	 TAG(emit_elts)( ctx, elts+start, 1 );
+	 TAG(emit_elts)( ctx, elts+j, nr - 1 );
+	 NEW_PRIMITIVE();
+	 currentsz = dmasz;
+      }
+   } else {
+      /* TODO: try to emit as indexed triangles */
+      ELT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+
+static void TAG(render_poly_elts)( GLcontext *ctx,
+				   GLuint start,
+				   GLuint count,
+				   GLuint flags )
+{
+   if (HAVE_POLYGONS && 0) {
+   } else if (HAVE_TRI_FANS && !(ctx->_TriangleCaps & DD_FLATSHADE)) {
+      LOCAL_VARS;
+      GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+      GLuint j, nr;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+
+      NEW_PRIMITIVE();
+      ELT_INIT( GL_TRIANGLE_FAN );
+
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+      if (currentsz < 8) {
+	 NEW_BUFFER();
+	 currentsz = dmasz;
+      }
+
+      for (j = start + 1 ; j + 1 < count ; j += nr - 1 ) {
+	 nr = MIN2( currentsz, count - j + 1 );
+	 TAG(emit_elts)( ctx, elts+start, 1 );
+	 TAG(emit_elts)( ctx, elts+j, nr - 1 );
+	 NEW_PRIMITIVE();
+	 currentsz = dmasz;
+      }
+   } else {
+      ELT_FALLBACK( ctx, start, count, flags );
+   }
+}
+
+static void TAG(render_quad_strip_elts)( GLcontext *ctx,
+					 GLuint start,
+					 GLuint count,
+					 GLuint flags )
+{
+   if (HAVE_QUAD_STRIPS && 0) {
+   }
+   else if (HAVE_TRI_STRIPS) {
+      LOCAL_VARS;
+      GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+      GLuint j, nr;
+
+      NEW_PRIMITIVE();
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+
+      /* Emit whole number of quads in total, and in each buffer.
+       */
+      dmasz -= dmasz & 1;
+      count -= (count-start) & 1;
+      currentsz -= currentsz & 1;
+
+      if (currentsz < 12)
+	 currentsz = dmasz;
+
+      if (ctx->_TriangleCaps & DD_FLATSHADE) {
+	 ELT_INIT( GL_TRIANGLES );
+
+	 currentsz = currentsz/6*2;
+	 dmasz = dmasz/6*2;
+
+	 for (j = start; j + 3 < count; j += nr - 2 ) {
+	    nr = MIN2( currentsz, count - j );
+
+	    if (nr >= 4)
+	    {
+	       GLint i;
+	       GLint quads = (nr/2)-1;
+	       ELTS_VARS;
+
+
+	       NEW_PRIMITIVE();
+	       ALLOC_ELTS_NEW_PRIMITIVE( quads*6 );
+
+	       for ( i = j-start ; i < j-start+quads ; i++, elts += 2 ) {
+		  EMIT_TWO_ELTS( 0, elts[0], elts[1] );
+		  EMIT_TWO_ELTS( 2, elts[2], elts[1] );
+		  EMIT_TWO_ELTS( 4, elts[3], elts[2] );
+		  INCR_ELTS( 6 );
+	       }
+
+	       NEW_PRIMITIVE();
+	    }
+
+	    currentsz = dmasz;
+	 }
+      }
+      else {
+	 ELT_INIT( GL_TRIANGLE_STRIP );
+
+	 for (j = start; j + 3 < count; j += nr - 2 ) {
+	    nr = MIN2( currentsz, count - j );
+	    TAG(emit_elts)( ctx, elts+j, nr );
+	    NEW_PRIMITIVE();
+	    currentsz = dmasz;
+	 }
+      }
+   }
+}
+
+
+static void TAG(render_quads_elts)( GLcontext *ctx,
+				    GLuint start,
+				    GLuint count,
+				    GLuint flags )
+{
+   if (HAVE_QUADS && 0) {
+   } else {
+      LOCAL_VARS;
+      GLuint *elts = TNL_CONTEXT(ctx)->vb.Elts;
+      int dmasz = GET_SUBSEQUENT_VB_MAX_ELTS();
+      int currentsz;
+      GLuint j, nr;
+
+      ELT_INIT( GL_TRIANGLES );
+      currentsz = GET_CURRENT_VB_MAX_ELTS();
+
+      /* Emit whole number of quads in total, and in each buffer.
+       */
+      dmasz -= dmasz & 3;
+      count -= (count-start) & 3;
+      currentsz -= currentsz & 3;
+
+      /* Adjust for rendering as triangles:
+       */
+      currentsz = currentsz/6*4;
+      dmasz = dmasz/6*4;
+
+      if (currentsz < 8)
+	 currentsz = dmasz;
+
+      for (j = start; j + 3 < count; j += nr - 2 ) {
+	 nr = MIN2( currentsz, count - j );
+
+	 if (nr >= 4)
+	 {
+	    GLint quads = nr/4;
+	    GLint i;
+	    ELTS_VARS;
+	    NEW_PRIMITIVE();
+	    ALLOC_ELTS_NEW_PRIMITIVE( quads * 6 );
+
+	    for ( i = j-start ; i < j-start+quads ; i++, elts += 4 ) {
+	       EMIT_TWO_ELTS( 0, elts[0], elts[1] );
+	       EMIT_TWO_ELTS( 2, elts[3], elts[1] );
+	       EMIT_TWO_ELTS( 4, elts[2], elts[3] );
+	       INCR_ELTS( 6 );
+	    }
+	 }
+
+	 NEW_PRIMITIVE();
+	 currentsz = dmasz;
+      }
+   }
+}
+
+
+
+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),
+};
+#endif