src/parsec/disk-image/parsec/parsec-benchmark/pkgs/libs/mesa/src/src/mesa/tnl_dd/t_dd_tritmp.h - public/gem5-resources - Git at Google

 /*
  * Mesa 3-D graphics library
  * Version:  6.3
  *
  * Copyright (C) 1999-2005  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 building functions to plug into the driver interface
  * of t_vb_render.c:
  *     ctx->Driver.QuadFunc
  *     ctx->Driver.TriangleFunc
  *     ctx->Driver.LineFunc
  *     ctx->Driver.PointsFunc
  *
  * DO_TWOSIDE:   Plug back-color values from the VB into backfacing triangles,
  *               and restore vertices afterwards.
  * DO_OFFSET:    Calculate offset for triangles and adjust vertices.  Restore
  *               vertices after rendering.
  * DO_FLAT:      For hardware without native flatshading, copy provoking colors
  *               into the other vertices.  Restore after rendering.
  * DO_UNFILLED:  Decompose triangles to lines and points where appropriate.
  * DO_TWOSTENCIL:Gross hack for two-sided stencil.
  *
  * HAVE_RGBA: Vertices have rgba values (otherwise index values).
  * HAVE_SPEC: Vertices have secondary rgba values.
  *
  * VERT_X(v): Alias for vertex x value.
  * VERT_Y(v): Alias for vertex y value.
  * VERT_Z(v): Alias for vertex z value.
  * DEPTH_SCALE: Scale for constant offset.
  * REVERSE_DEPTH: Viewport depth range reversed.
  *
  * VERTEX: Hardware vertex type.
  * GET_VERTEX(n): Retreive vertex with index n.
  * AREA_IS_CCW(a): Return true if triangle with signed area a is ccw.
  *
  * VERT_SET_RGBA: Assign vertex rgba from VB color.
  * VERT_COPY_RGBA: Copy vertex rgba another vertex.
  * VERT_SAVE_RGBA: Save vertex rgba to a local variable.
  * VERT_RESTORE_RGBA: Restore vertex rgba from a local variable.
  *   --> Similar for IND and SPEC.
  *
  * LOCAL_VARS(n): (At least) define local vars for save/restore rgba.
  *
  */

 #if HAVE_RGBA
 #define VERT_SET_IND( v, c ) (void) c
 #define VERT_COPY_IND( v0, v1 )
 #define VERT_SAVE_IND( idx )
 #define VERT_RESTORE_IND( idx )
 #if HAVE_BACK_COLORS
 #define VERT_SET_RGBA( v, c )
 #endif
 #else
 #define VERT_SET_RGBA( v, c ) (void) c
 #define VERT_COPY_RGBA( v0, v1 )
 #define VERT_SAVE_RGBA( idx )
 #define VERT_RESTORE_RGBA( idx )
 #if HAVE_BACK_COLORS
 #define VERT_SET_IND( v, c )
 #endif
 #endif

 #if !HAVE_SPEC
 #define VERT_SET_SPEC( v, c ) (void) c
 #define VERT_COPY_SPEC( v0, v1 )
 #define VERT_SAVE_SPEC( idx )
 #define VERT_RESTORE_SPEC( idx )
 #if HAVE_BACK_COLORS
 #define VERT_COPY_SPEC1( v )
 #endif
 #else
 #if HAVE_BACK_COLORS
 #define VERT_SET_SPEC( v, c )
 #endif
 #endif

 #if !HAVE_BACK_COLORS
 #define VERT_COPY_SPEC1( v )
 #define VERT_COPY_IND1( v )
 #define VERT_COPY_RGBA1( v )
 #endif

 #ifndef INSANE_VERTICES
 #define VERT_SET_Z(v,val) VERT_Z(v) = val
 #define VERT_Z_ADD(v,val) VERT_Z(v) += val
 #endif

 #ifndef REVERSE_DEPTH
 #define REVERSE_DEPTH 0
 #endif

 /* disable twostencil for un-aware drivers */
 #ifndef HAVE_STENCIL_TWOSIDE
 #define HAVE_STENCIL_TWOSIDE 0
 #endif
 #ifndef DO_TWOSTENCIL
 #define DO_TWOSTENCIL 0
 #endif
 #ifndef SETUP_STENCIL
 #define SETUP_STENCIL(f)
 #endif
 #ifndef UNSET_STENCIL
 #define UNSET_STENCIL(f)
 #endif

 #if DO_TRI
 static void TAG(triangle)( GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 )
 {
    struct vertex_buffer *VB = &TNL_CONTEXT( ctx )->vb;
    VERTEX *v[3];
    GLfloat offset = 0;
    GLfloat z[3];
    GLenum mode = GL_FILL;
    GLuint facing = 0;
    LOCAL_VARS(3);

 /*     fprintf(stderr, "%s\n", __FUNCTION__); */

    v[0] = (VERTEX *)GET_VERTEX(e0);
    v[1] = (VERTEX *)GET_VERTEX(e1);
    v[2] = (VERTEX *)GET_VERTEX(e2);

    if (DO_TWOSIDE || DO_OFFSET || DO_UNFILLED || DO_TWOSTENCIL)
    {
       GLfloat ex = VERT_X(v[0]) - VERT_X(v[2]);
       GLfloat ey = VERT_Y(v[0]) - VERT_Y(v[2]);
       GLfloat fx = VERT_X(v[1]) - VERT_X(v[2]);
       GLfloat fy = VERT_Y(v[1]) - VERT_Y(v[2]);
       GLfloat cc = ex*fy - ey*fx;

       if (DO_TWOSIDE || DO_UNFILLED || DO_TWOSTENCIL)
       {
 	 facing = AREA_IS_CCW( cc ) ^ ctx->Polygon._FrontBit;

 	 if (DO_UNFILLED) {
 	    if (facing) {
 	       mode = ctx->Polygon.BackMode;
 	       if (ctx->Polygon.CullFlag &&
 		   ctx->Polygon.CullFaceMode != GL_FRONT) {
 		  return;
 	       }
 	    } else {
 	       mode = ctx->Polygon.FrontMode;
 	       if (ctx->Polygon.CullFlag &&
 		   ctx->Polygon.CullFaceMode != GL_BACK) {
 		  return;
 	       }
 	    }
 	 }

 	 if (DO_TWOSIDE && facing == 1)
 	 {
 	    if (HAVE_RGBA) {
 	       if (HAVE_BACK_COLORS) {
 		  if (!DO_FLAT) {
 		     VERT_SAVE_RGBA( 0 );
 		     VERT_SAVE_RGBA( 1 );
 		     VERT_COPY_RGBA1( v[0] );
 		     VERT_COPY_RGBA1( v[1] );
 		  }
 		  VERT_SAVE_RGBA( 2 );
 		  VERT_COPY_RGBA1( v[2] );
 		  if (HAVE_SPEC) {
 		     if (!DO_FLAT) {
 			VERT_SAVE_SPEC( 0 );
 			VERT_SAVE_SPEC( 1 );
 			VERT_COPY_SPEC1( v[0] );
 			VERT_COPY_SPEC1( v[1] );
 		     }
 		     VERT_SAVE_SPEC( 2 );
 		     VERT_COPY_SPEC1( v[2] );
 		  }
 	       }
 	       else {
 		  GLfloat (*vbcolor)[4] = VB->ColorPtr[1]->data;
 		  (void) vbcolor;

 		  if (!DO_FLAT) {
 		     VERT_SAVE_RGBA( 0 );
 		     VERT_SAVE_RGBA( 1 );
 		  }
 		  VERT_SAVE_RGBA( 2 );

 		  if (VB->ColorPtr[1]->stride) {
 		     ASSERT(VB->ColorPtr[1]->stride == 4*sizeof(GLfloat));

 		     if (!DO_FLAT) {
 			VERT_SET_RGBA( v[0], vbcolor[e0] );
 			VERT_SET_RGBA( v[1], vbcolor[e1] );
 		     }
 		     VERT_SET_RGBA( v[2], vbcolor[e2] );
 		  }
 		  else {
 		     if (!DO_FLAT) {
 			VERT_SET_RGBA( v[0], vbcolor[0] );
 			VERT_SET_RGBA( v[1], vbcolor[0] );
 		     }
 		     VERT_SET_RGBA( v[2], vbcolor[0] );
 		  }

 		  if (HAVE_SPEC && VB->SecondaryColorPtr[1]) {
 		     GLfloat (*vbspec)[4] = VB->SecondaryColorPtr[1]->data;
 		     ASSERT(VB->SecondaryColorPtr[1]->stride == 4*sizeof(GLfloat));

 		     if (!DO_FLAT) {
 			VERT_SAVE_SPEC( 0 );
 			VERT_SAVE_SPEC( 1 );
 			VERT_SET_SPEC( v[0], vbspec[e0] );
 			VERT_SET_SPEC( v[1], vbspec[e1] );
 		     }
 		     VERT_SAVE_SPEC( 2 );
 		     VERT_SET_SPEC( v[2], vbspec[e2] );
 		  }
 	       }
 	    }
 	    else {
 	       GLfloat (*vbindex) = (GLfloat *)VB->IndexPtr[1]->data;
 	       if (!DO_FLAT) {
 		  VERT_SAVE_IND( 0 );
 		  VERT_SAVE_IND( 1 );
 		  VERT_SET_IND( v[0], vbindex[e0] );
 		  VERT_SET_IND( v[1], vbindex[e1] );
 	       }
 	       VERT_SAVE_IND( 2 );
 	       VERT_SET_IND( v[2], vbindex[e2] );
 	    }
 	 }
       }


       if (DO_OFFSET)
       {
 	 offset = ctx->Polygon.OffsetUnits * DEPTH_SCALE;
 	 z[0] = VERT_Z(v[0]);
 	 z[1] = VERT_Z(v[1]);
 	 z[2] = VERT_Z(v[2]);
 	 if (cc * cc > 1e-16) {
 	    GLfloat ic	= 1.0 / cc;
 	    GLfloat ez	= z[0] - z[2];
 	    GLfloat fz	= z[1] - z[2];
 	    GLfloat a	= ey*fz - ez*fy;
 	    GLfloat b	= ez*fx - ex*fz;
 	    GLfloat ac	= a * ic;
 	    GLfloat bc	= b * ic;
 	    if ( ac < 0.0f ) ac = -ac;
 	    if ( bc < 0.0f ) bc = -bc;
 	    offset += MAX2( ac, bc ) * ctx->Polygon.OffsetFactor / ctx->DrawBuffer->_MRD;
 	 }
 	 offset *= ctx->DrawBuffer->_MRD * (REVERSE_DEPTH ? -1.0 : 1.0);
       }
    }

    if (DO_FLAT) {
       if (HAVE_RGBA) {
 	 VERT_SAVE_RGBA( 0 );
 	 VERT_SAVE_RGBA( 1 );
 	 VERT_COPY_RGBA( v[0], v[2] );
 	 VERT_COPY_RGBA( v[1], v[2] );
 	 if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
 	    VERT_SAVE_SPEC( 0 );
 	    VERT_SAVE_SPEC( 1 );
 	    VERT_COPY_SPEC( v[0], v[2] );
 	    VERT_COPY_SPEC( v[1], v[2] );
 	 }
       }
       else {
 	 VERT_SAVE_IND( 0 );
 	 VERT_SAVE_IND( 1 );
 	 VERT_COPY_IND( v[0], v[2] );
 	 VERT_COPY_IND( v[1], v[2] );
       }
    }

    if (mode == GL_POINT) {
       if (DO_OFFSET && ctx->Polygon.OffsetPoint) {
 	 VERT_Z_ADD(v[0], offset);
 	 VERT_Z_ADD(v[1], offset);
 	 VERT_Z_ADD(v[2], offset);
       }
       if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
          SETUP_STENCIL(facing);
          UNFILLED_TRI( ctx, GL_POINT, e0, e1, e2 );
          UNSET_STENCIL(facing);
       } else {
          UNFILLED_TRI( ctx, GL_POINT, e0, e1, e2 );
       }
    } else if (mode == GL_LINE) {
       if (DO_OFFSET && ctx->Polygon.OffsetLine) {
 	 VERT_Z_ADD(v[0], offset);
 	 VERT_Z_ADD(v[1], offset);
 	 VERT_Z_ADD(v[2], offset);
       }
       if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
          SETUP_STENCIL(facing);
          UNFILLED_TRI( ctx, GL_LINE, e0, e1, e2 );
          UNSET_STENCIL(facing);
       } else {
          UNFILLED_TRI( ctx, GL_LINE, e0, e1, e2 );
       }
    } else {
       if (DO_OFFSET && ctx->Polygon.OffsetFill) {
 	 VERT_Z_ADD(v[0], offset);
 	 VERT_Z_ADD(v[1], offset);
 	 VERT_Z_ADD(v[2], offset);
       }
       if (DO_UNFILLED)
 	 RASTERIZE( GL_TRIANGLES );
       if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
          SETUP_STENCIL(facing);
          TRI( v[0], v[1], v[2] );
          UNSET_STENCIL(facing);
       } else {
          TRI( v[0], v[1], v[2] );
       }
    }

    if (DO_OFFSET)
    {
       VERT_SET_Z(v[0], z[0]);
       VERT_SET_Z(v[1], z[1]);
       VERT_SET_Z(v[2], z[2]);
    }

    if (DO_TWOSIDE && facing == 1)
    {
       if (HAVE_RGBA) {
 	 if (!DO_FLAT) {
 	    VERT_RESTORE_RGBA( 0 );
 	    VERT_RESTORE_RGBA( 1 );
 	 }
 	 VERT_RESTORE_RGBA( 2 );
 	 if (HAVE_SPEC) {
 	    if (!DO_FLAT) {
 	       VERT_RESTORE_SPEC( 0 );
 	       VERT_RESTORE_SPEC( 1 );
 	    }
 	    VERT_RESTORE_SPEC( 2 );
 	 }
       }
       else {
 	 if (!DO_FLAT) {
 	    VERT_RESTORE_IND( 0 );
 	    VERT_RESTORE_IND( 1 );
 	 }
 	 VERT_RESTORE_IND( 2 );
       }
    }


    if (DO_FLAT) {
       if (HAVE_RGBA) {
 	 VERT_RESTORE_RGBA( 0 );
 	 VERT_RESTORE_RGBA( 1 );
 	 if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
 	    VERT_RESTORE_SPEC( 0 );
 	    VERT_RESTORE_SPEC( 1 );
 	 }
       }
       else {
 	 VERT_RESTORE_IND( 0 );
 	 VERT_RESTORE_IND( 1 );
       }
    }
 }
 #endif

 #if DO_QUAD
 #if DO_FULL_QUAD
 static void TAG(quadr)( GLcontext *ctx,
 		       GLuint e0, GLuint e1, GLuint e2, GLuint e3 )
 {
    struct vertex_buffer *VB = &TNL_CONTEXT( ctx )->vb;
    VERTEX *v[4];
    GLfloat offset = 0;
    GLfloat z[4];
    GLenum mode = GL_FILL;
    GLuint facing = 0;
    LOCAL_VARS(4);

    v[0] = (VERTEX *)GET_VERTEX(e0);
    v[1] = (VERTEX *)GET_VERTEX(e1);
    v[2] = (VERTEX *)GET_VERTEX(e2);
    v[3] = (VERTEX *)GET_VERTEX(e3);

    if (DO_TWOSIDE || DO_OFFSET || DO_UNFILLED || DO_TWOSTENCIL)
    {
       GLfloat ex = VERT_X(v[2]) - VERT_X(v[0]);
       GLfloat ey = VERT_Y(v[2]) - VERT_Y(v[0]);
       GLfloat fx = VERT_X(v[3]) - VERT_X(v[1]);
       GLfloat fy = VERT_Y(v[3]) - VERT_Y(v[1]);
       GLfloat cc = ex*fy - ey*fx;

       if (DO_TWOSIDE || DO_UNFILLED || DO_TWOSTENCIL)
       {
 	 facing = AREA_IS_CCW( cc ) ^ ctx->Polygon._FrontBit;

 	 if (DO_UNFILLED) {
 	    if (facing) {
 	       mode = ctx->Polygon.BackMode;
 	       if (ctx->Polygon.CullFlag &&
 		   ctx->Polygon.CullFaceMode != GL_FRONT) {
 		  return;
 	       }
 	    } else {
 	       mode = ctx->Polygon.FrontMode;
 	       if (ctx->Polygon.CullFlag &&
 		   ctx->Polygon.CullFaceMode != GL_BACK) {
 		  return;
 	       }
 	    }
 	 }

 	 if (DO_TWOSIDE && facing == 1)
 	 {
 	    if (HAVE_RGBA) {
 	       GLfloat (*vbcolor)[4] = VB->ColorPtr[1]->data;
 	       (void)vbcolor;

 	       if (HAVE_BACK_COLORS) {
                   if (!DO_FLAT) {
                      VERT_SAVE_RGBA( 0 );
                      VERT_SAVE_RGBA( 1 );
                      VERT_SAVE_RGBA( 2 );
 		     VERT_COPY_RGBA1( v[0] );
 		     VERT_COPY_RGBA1( v[1] );
 		     VERT_COPY_RGBA1( v[2] );
 		  }
 		  VERT_SAVE_RGBA( 3 );
 		  VERT_COPY_RGBA1( v[3] );
 		  if (HAVE_SPEC) {
                      if (!DO_FLAT) {
                         VERT_SAVE_SPEC( 0 );
                         VERT_SAVE_SPEC( 1 );
                         VERT_SAVE_SPEC( 2 );
 			VERT_COPY_SPEC1( v[0] );
 			VERT_COPY_SPEC1( v[1] );
 			VERT_COPY_SPEC1( v[2] );
 		     }
 		     VERT_SAVE_SPEC( 3 );
 		     VERT_COPY_SPEC1( v[3] );
 		  }
 	       }
 	       else {
 	          if (!DO_FLAT) {
 		     VERT_SAVE_RGBA( 0 );
 		     VERT_SAVE_RGBA( 1 );
 		     VERT_SAVE_RGBA( 2 );
 		  }
 	          VERT_SAVE_RGBA( 3 );

 		  if (VB->ColorPtr[1]->stride) {
 		     if (!DO_FLAT) {
 			VERT_SET_RGBA( v[0], vbcolor[e0] );
 			VERT_SET_RGBA( v[1], vbcolor[e1] );
 			VERT_SET_RGBA( v[2], vbcolor[e2] );
 		     }
 		     VERT_SET_RGBA( v[3], vbcolor[e3] );
 		  }
 		  else {
 		     if (!DO_FLAT) {
 			VERT_SET_RGBA( v[0], vbcolor[0] );
 			VERT_SET_RGBA( v[1], vbcolor[0] );
 			VERT_SET_RGBA( v[2], vbcolor[0] );
 		     }
 		     VERT_SET_RGBA( v[3], vbcolor[0] );
 		  }

 	          if (HAVE_SPEC && VB->SecondaryColorPtr[1]) {
 		     GLfloat (*vbspec)[4] = VB->SecondaryColorPtr[1]->data;
 		     ASSERT(VB->SecondaryColorPtr[1]->stride==4*sizeof(GLfloat));

 		     if (!DO_FLAT) {
 		        VERT_SAVE_SPEC( 0 );
 		        VERT_SAVE_SPEC( 1 );
 		        VERT_SAVE_SPEC( 2 );
 		        VERT_SET_SPEC( v[0], vbspec[e0] );
 		        VERT_SET_SPEC( v[1], vbspec[e1] );
 		        VERT_SET_SPEC( v[2], vbspec[e2] );
 		     }
 		     VERT_SAVE_SPEC( 3 );
 		     VERT_SET_SPEC( v[3], vbspec[e3] );
 	          }
 	       }
 	    }
 	    else {
 	       GLfloat *vbindex = (GLfloat *)VB->IndexPtr[1]->data;
 	       if (!DO_FLAT) {
 		  VERT_SAVE_IND( 0 );
 		  VERT_SAVE_IND( 1 );
 		  VERT_SAVE_IND( 2 );
 		  VERT_SET_IND( v[0], vbindex[e0] );
 		  VERT_SET_IND( v[1], vbindex[e1] );
 		  VERT_SET_IND( v[2], vbindex[e2] );
 	       }
 	       VERT_SAVE_IND( 3 );
 	       VERT_SET_IND( v[3], vbindex[e3] );
 	    }
 	 }
       }


       if (DO_OFFSET)
       {
 	 offset = ctx->Polygon.OffsetUnits * DEPTH_SCALE;
 	 z[0] = VERT_Z(v[0]);
 	 z[1] = VERT_Z(v[1]);
 	 z[2] = VERT_Z(v[2]);
 	 z[3] = VERT_Z(v[3]);
 	 if (cc * cc > 1e-16) {
 	    GLfloat ez = z[2] - z[0];
 	    GLfloat fz = z[3] - z[1];
 	    GLfloat a	= ey*fz - ez*fy;
 	    GLfloat b	= ez*fx - ex*fz;
 	    GLfloat ic	= 1.0 / cc;
 	    GLfloat ac	= a * ic;
 	    GLfloat bc	= b * ic;
 	    if ( ac < 0.0f ) ac = -ac;
 	    if ( bc < 0.0f ) bc = -bc;
 	    offset += MAX2( ac, bc ) * ctx->Polygon.OffsetFactor / ctx->DrawBuffer->_MRD;
 	 }
 	 offset *= ctx->DrawBuffer->_MRD * (REVERSE_DEPTH ? -1.0 : 1.0);
       }
    }

    if (DO_FLAT) {
       if (HAVE_RGBA) {
 	 VERT_SAVE_RGBA( 0 );
 	 VERT_SAVE_RGBA( 1 );
 	 VERT_SAVE_RGBA( 2 );
 	 VERT_COPY_RGBA( v[0], v[3] );
 	 VERT_COPY_RGBA( v[1], v[3] );
 	 VERT_COPY_RGBA( v[2], v[3] );
 	 if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
 	    VERT_SAVE_SPEC( 0 );
 	    VERT_SAVE_SPEC( 1 );
 	    VERT_SAVE_SPEC( 2 );
 	    VERT_COPY_SPEC( v[0], v[3] );
 	    VERT_COPY_SPEC( v[1], v[3] );
 	    VERT_COPY_SPEC( v[2], v[3] );
 	 }
       }
       else {
 	 VERT_SAVE_IND( 0 );
 	 VERT_SAVE_IND( 1 );
 	 VERT_SAVE_IND( 2 );
 	 VERT_COPY_IND( v[0], v[3] );
 	 VERT_COPY_IND( v[1], v[3] );
 	 VERT_COPY_IND( v[2], v[3] );
       }
    }

    if (mode == GL_POINT) {
       if (( DO_OFFSET) && ctx->Polygon.OffsetPoint) {
 	 VERT_Z_ADD(v[0], offset);
 	 VERT_Z_ADD(v[1], offset);
 	 VERT_Z_ADD(v[2], offset);
 	 VERT_Z_ADD(v[3], offset);
       }
       if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
          SETUP_STENCIL(facing);
          UNFILLED_QUAD( ctx, GL_POINT, e0, e1, e2, e3 );
          UNSET_STENCIL(facing);
       } else {
          UNFILLED_QUAD( ctx, GL_POINT, e0, e1, e2, e3 );
       }
    } else if (mode == GL_LINE) {
       if (DO_OFFSET && ctx->Polygon.OffsetLine) {
 	 VERT_Z_ADD(v[0], offset);
 	 VERT_Z_ADD(v[1], offset);
 	 VERT_Z_ADD(v[2], offset);
 	 VERT_Z_ADD(v[3], offset);
       }
       if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
          SETUP_STENCIL(facing);
          UNFILLED_QUAD( ctx, GL_LINE, e0, e1, e2, e3 );
          UNSET_STENCIL(facing);
       } else {
          UNFILLED_QUAD( ctx, GL_LINE, e0, e1, e2, e3 );
       }
    } else {
       if (DO_OFFSET && ctx->Polygon.OffsetFill) {
 	 VERT_Z_ADD(v[0], offset);
 	 VERT_Z_ADD(v[1], offset);
 	 VERT_Z_ADD(v[2], offset);
 	 VERT_Z_ADD(v[3], offset);
       }
       RASTERIZE( GL_QUADS );
       if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
          SETUP_STENCIL(facing);
          QUAD( (v[0]), (v[1]), (v[2]), (v[3]) );
          UNSET_STENCIL(facing);
       } else {
          QUAD( (v[0]), (v[1]), (v[2]), (v[3]) );
       }
    }

    if (DO_OFFSET)
    {
       VERT_SET_Z(v[0], z[0]);
       VERT_SET_Z(v[1], z[1]);
       VERT_SET_Z(v[2], z[2]);
       VERT_SET_Z(v[3], z[3]);
    }

    if (DO_TWOSIDE && facing == 1)
    {
       if (HAVE_RGBA) {
 	 if (!DO_FLAT) {
 	    VERT_RESTORE_RGBA( 0 );
 	    VERT_RESTORE_RGBA( 1 );
 	    VERT_RESTORE_RGBA( 2 );
 	 }
 	 VERT_RESTORE_RGBA( 3 );
 	 if (HAVE_SPEC) {
 	    if (!DO_FLAT) {
 	       VERT_RESTORE_SPEC( 0 );
 	       VERT_RESTORE_SPEC( 1 );
 	       VERT_RESTORE_SPEC( 2 );
 	    }
 	    VERT_RESTORE_SPEC( 3 );
 	 }
       }
       else {
 	 if (!DO_FLAT) {
 	    VERT_RESTORE_IND( 0 );
 	    VERT_RESTORE_IND( 1 );
 	    VERT_RESTORE_IND( 2 );
 	 }
 	 VERT_RESTORE_IND( 3 );
       }
    }


    if (DO_FLAT) {
       if (HAVE_RGBA) {
 	 VERT_RESTORE_RGBA( 0 );
 	 VERT_RESTORE_RGBA( 1 );
 	 VERT_RESTORE_RGBA( 2 );
 	 if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
 	    VERT_RESTORE_SPEC( 0 );
 	    VERT_RESTORE_SPEC( 1 );
 	    VERT_RESTORE_SPEC( 2 );
 	 }
       }
       else {
 	 VERT_RESTORE_IND( 0 );
 	 VERT_RESTORE_IND( 1 );
 	 VERT_RESTORE_IND( 2 );
       }
    }
 }
 #else
 static void TAG(quadr)( GLcontext *ctx, GLuint e0,
 		       GLuint e1, GLuint e2, GLuint e3 )
 {
    if (DO_UNFILLED) {
       struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
       GLubyte ef1 = VB->EdgeFlag[e1];
       GLubyte ef3 = VB->EdgeFlag[e3];
       VB->EdgeFlag[e1] = 0;
       TAG(triangle)( ctx, e0, e1, e3 );
       VB->EdgeFlag[e1] = ef1;
       VB->EdgeFlag[e3] = 0;
       TAG(triangle)( ctx, e1, e2, e3 );
       VB->EdgeFlag[e3] = ef3;
    } else {
       TAG(triangle)( ctx, e0, e1, e3 );
       TAG(triangle)( ctx, e1, e2, e3 );
    }
 }
 #endif
 #endif

 #if DO_LINE
 static void TAG(line)( GLcontext *ctx, GLuint e0, GLuint e1 )
 {
    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
    VERTEX *v[2];
    LOCAL_VARS(2);

    v[0] = (VERTEX *)GET_VERTEX(e0);
    v[1] = (VERTEX *)GET_VERTEX(e1);

    if (DO_FLAT) {
       if (HAVE_RGBA) {
 	 VERT_SAVE_RGBA( 0 );
 	 VERT_COPY_RGBA( v[0], v[1] );
 	 if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
 	    VERT_SAVE_SPEC( 0 );
 	    VERT_COPY_SPEC( v[0], v[1] );
 	 }
       }
       else {
 	 VERT_SAVE_IND( 0 );
 	 VERT_COPY_IND( v[0], v[1] );
       }
    }

    LINE( v[0], v[1] );

    if (DO_FLAT) {
       if (HAVE_RGBA) {
 	 VERT_RESTORE_RGBA( 0 );

 	 if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
 	    VERT_RESTORE_SPEC( 0 );
 	 }
       }
       else {
 	 VERT_RESTORE_IND( 0 );
       }
    }
 }
 #endif

 #if DO_POINTS
 static void TAG(points)( GLcontext *ctx, GLuint first, GLuint last )
 {
    struct vertex_buffer *VB = &TNL_CONTEXT( ctx )->vb;
    GLuint i;
    LOCAL_VARS(1);

    if (VB->Elts == 0) {
       for ( i = first ; i < last ; i++ ) {
 	 if ( VB->ClipMask[i] == 0 ) {
 	    VERTEX *v = (VERTEX *)GET_VERTEX(i);
 	    POINT( v );
 	 }
       }
    } else {
       for ( i = first ; i < last ; i++ ) {
 	 GLuint e = VB->Elts[i];
 	 if ( VB->ClipMask[e] == 0 ) {
 	    VERTEX *v = (VERTEX *)GET_VERTEX(e);
 	    POINT( v );
 	 }
       }
    }
 }
 #endif

 static void TAG(init)( void )
 {
 #if DO_QUAD
    TAB[IND].quad = TAG(quadr);
 #endif
 #if DO_TRI
    TAB[IND].triangle = TAG(triangle);
 #endif
 #if DO_LINE
    TAB[IND].line = TAG(line);
 #endif
 #if DO_POINTS
    TAB[IND].points = TAG(points);
 #endif
 }

 #undef IND
 #undef TAG

 #if HAVE_RGBA
 #undef VERT_SET_IND
 #undef VERT_COPY_IND
 #undef VERT_SAVE_IND
 #undef VERT_RESTORE_IND
 #if HAVE_BACK_COLORS
 #undef VERT_SET_RGBA
 #endif
 #else
 #undef VERT_SET_RGBA
 #undef VERT_COPY_RGBA
 #undef VERT_SAVE_RGBA
 #undef VERT_RESTORE_RGBA
 #if HAVE_BACK_COLORS
 #undef VERT_SET_IND
 #endif
 #endif

 #if !HAVE_SPEC
 #undef VERT_SET_SPEC
 #undef VERT_COPY_SPEC
 #undef VERT_SAVE_SPEC
 #undef VERT_RESTORE_SPEC
 #if HAVE_BACK_COLORS
 #undef VERT_COPY_SPEC1
 #endif
 #else
 #if HAVE_BACK_COLORS
 #undef VERT_SET_SPEC
 #endif
 #endif

 #if !HAVE_BACK_COLORS
 #undef VERT_COPY_SPEC1
 #undef VERT_COPY_IND1
 #undef VERT_COPY_RGBA1
 #endif

 #ifndef INSANE_VERTICES
 #undef VERT_SET_Z
 #undef VERT_Z_ADD
 #endif
	/*
	* Mesa 3-D graphics library
	* Version: 6.3
	*
	* Copyright (C) 1999-2005 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 building functions to plug into the driver interface
	* of t_vb_render.c:
	* ctx->Driver.QuadFunc
	* ctx->Driver.TriangleFunc
	* ctx->Driver.LineFunc
	* ctx->Driver.PointsFunc
	*
	* DO_TWOSIDE: Plug back-color values from the VB into backfacing triangles,
	* and restore vertices afterwards.
	* DO_OFFSET: Calculate offset for triangles and adjust vertices. Restore
	* vertices after rendering.
	* DO_FLAT: For hardware without native flatshading, copy provoking colors
	* into the other vertices. Restore after rendering.
	* DO_UNFILLED: Decompose triangles to lines and points where appropriate.
	* DO_TWOSTENCIL:Gross hack for two-sided stencil.
	*
	* HAVE_RGBA: Vertices have rgba values (otherwise index values).
	* HAVE_SPEC: Vertices have secondary rgba values.
	*
	* VERT_X(v): Alias for vertex x value.
	* VERT_Y(v): Alias for vertex y value.
	* VERT_Z(v): Alias for vertex z value.
	* DEPTH_SCALE: Scale for constant offset.
	* REVERSE_DEPTH: Viewport depth range reversed.
	*
	* VERTEX: Hardware vertex type.
	* GET_VERTEX(n): Retreive vertex with index n.
	* AREA_IS_CCW(a): Return true if triangle with signed area a is ccw.
	*
	* VERT_SET_RGBA: Assign vertex rgba from VB color.
	* VERT_COPY_RGBA: Copy vertex rgba another vertex.
	* VERT_SAVE_RGBA: Save vertex rgba to a local variable.
	* VERT_RESTORE_RGBA: Restore vertex rgba from a local variable.
	* --> Similar for IND and SPEC.
	*
	* LOCAL_VARS(n): (At least) define local vars for save/restore rgba.
	*
	*/

	#if HAVE_RGBA
	#define VERT_SET_IND( v, c ) (void) c
	#define VERT_COPY_IND( v0, v1 )
	#define VERT_SAVE_IND( idx )
	#define VERT_RESTORE_IND( idx )
	#if HAVE_BACK_COLORS
	#define VERT_SET_RGBA( v, c )
	#endif
	#else
	#define VERT_SET_RGBA( v, c ) (void) c
	#define VERT_COPY_RGBA( v0, v1 )
	#define VERT_SAVE_RGBA( idx )
	#define VERT_RESTORE_RGBA( idx )
	#if HAVE_BACK_COLORS
	#define VERT_SET_IND( v, c )
	#endif
	#endif

	#if !HAVE_SPEC
	#define VERT_SET_SPEC( v, c ) (void) c
	#define VERT_COPY_SPEC( v0, v1 )
	#define VERT_SAVE_SPEC( idx )
	#define VERT_RESTORE_SPEC( idx )
	#if HAVE_BACK_COLORS
	#define VERT_COPY_SPEC1( v )
	#endif
	#else
	#if HAVE_BACK_COLORS
	#define VERT_SET_SPEC( v, c )
	#endif
	#endif

	#if !HAVE_BACK_COLORS
	#define VERT_COPY_SPEC1( v )
	#define VERT_COPY_IND1( v )
	#define VERT_COPY_RGBA1( v )
	#endif

	#ifndef INSANE_VERTICES
	#define VERT_SET_Z(v,val) VERT_Z(v) = val
	#define VERT_Z_ADD(v,val) VERT_Z(v) += val
	#endif

	#ifndef REVERSE_DEPTH
	#define REVERSE_DEPTH 0
	#endif

	/* disable twostencil for un-aware drivers */
	#ifndef HAVE_STENCIL_TWOSIDE
	#define HAVE_STENCIL_TWOSIDE 0
	#endif
	#ifndef DO_TWOSTENCIL
	#define DO_TWOSTENCIL 0
	#endif
	#ifndef SETUP_STENCIL
	#define SETUP_STENCIL(f)
	#endif
	#ifndef UNSET_STENCIL
	#define UNSET_STENCIL(f)
	#endif

	#if DO_TRI
	static void TAG(triangle)( GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 )
	{
	struct vertex_buffer *VB = &TNL_CONTEXT( ctx )->vb;
	VERTEX *v[3];
	GLfloat offset = 0;
	GLfloat z[3];
	GLenum mode = GL_FILL;
	GLuint facing = 0;
	LOCAL_VARS(3);

	/* fprintf(stderr, "%s\n", __FUNCTION__); */

	v[0] = (VERTEX *)GET_VERTEX(e0);
	v[1] = (VERTEX *)GET_VERTEX(e1);
	v[2] = (VERTEX *)GET_VERTEX(e2);

	if (DO_TWOSIDE \|\| DO_OFFSET \|\| DO_UNFILLED \|\| DO_TWOSTENCIL)
	{
	GLfloat ex = VERT_X(v[0]) - VERT_X(v[2]);
	GLfloat ey = VERT_Y(v[0]) - VERT_Y(v[2]);
	GLfloat fx = VERT_X(v[1]) - VERT_X(v[2]);
	GLfloat fy = VERT_Y(v[1]) - VERT_Y(v[2]);
	GLfloat cc = exfy - eyfx;

	if (DO_TWOSIDE \|\| DO_UNFILLED \|\| DO_TWOSTENCIL)
	{
	facing = AREA_IS_CCW( cc ) ^ ctx->Polygon._FrontBit;

	if (DO_UNFILLED) {
	if (facing) {
	mode = ctx->Polygon.BackMode;
	if (ctx->Polygon.CullFlag &&
	ctx->Polygon.CullFaceMode != GL_FRONT) {
	return;
	}
	} else {
	mode = ctx->Polygon.FrontMode;
	if (ctx->Polygon.CullFlag &&
	ctx->Polygon.CullFaceMode != GL_BACK) {
	return;
	}
	}
	}

	if (DO_TWOSIDE && facing == 1)
	{
	if (HAVE_RGBA) {
	if (HAVE_BACK_COLORS) {
	if (!DO_FLAT) {
	VERT_SAVE_RGBA( 0 );
	VERT_SAVE_RGBA( 1 );
	VERT_COPY_RGBA1( v[0] );
	VERT_COPY_RGBA1( v[1] );
	}
	VERT_SAVE_RGBA( 2 );
	VERT_COPY_RGBA1( v[2] );
	if (HAVE_SPEC) {
	if (!DO_FLAT) {
	VERT_SAVE_SPEC( 0 );
	VERT_SAVE_SPEC( 1 );
	VERT_COPY_SPEC1( v[0] );
	VERT_COPY_SPEC1( v[1] );
	}
	VERT_SAVE_SPEC( 2 );
	VERT_COPY_SPEC1( v[2] );
	}
	}
	else {
	GLfloat (*vbcolor)[4] = VB->ColorPtr[1]->data;
	(void) vbcolor;

	if (!DO_FLAT) {
	VERT_SAVE_RGBA( 0 );
	VERT_SAVE_RGBA( 1 );
	}
	VERT_SAVE_RGBA( 2 );

	if (VB->ColorPtr[1]->stride) {
	ASSERT(VB->ColorPtr[1]->stride == 4*sizeof(GLfloat));

	if (!DO_FLAT) {
	VERT_SET_RGBA( v[0], vbcolor[e0] );
	VERT_SET_RGBA( v[1], vbcolor[e1] );
	}
	VERT_SET_RGBA( v[2], vbcolor[e2] );
	}
	else {
	if (!DO_FLAT) {
	VERT_SET_RGBA( v[0], vbcolor[0] );
	VERT_SET_RGBA( v[1], vbcolor[0] );
	}
	VERT_SET_RGBA( v[2], vbcolor[0] );
	}

	if (HAVE_SPEC && VB->SecondaryColorPtr[1]) {
	GLfloat (*vbspec)[4] = VB->SecondaryColorPtr[1]->data;
	ASSERT(VB->SecondaryColorPtr[1]->stride == 4*sizeof(GLfloat));

	if (!DO_FLAT) {
	VERT_SAVE_SPEC( 0 );
	VERT_SAVE_SPEC( 1 );
	VERT_SET_SPEC( v[0], vbspec[e0] );
	VERT_SET_SPEC( v[1], vbspec[e1] );
	}
	VERT_SAVE_SPEC( 2 );
	VERT_SET_SPEC( v[2], vbspec[e2] );
	}
	}
	}
	else {
	GLfloat (vbindex) = (GLfloat )VB->IndexPtr[1]->data;
	if (!DO_FLAT) {
	VERT_SAVE_IND( 0 );
	VERT_SAVE_IND( 1 );
	VERT_SET_IND( v[0], vbindex[e0] );
	VERT_SET_IND( v[1], vbindex[e1] );
	}
	VERT_SAVE_IND( 2 );
	VERT_SET_IND( v[2], vbindex[e2] );
	}
	}
	}


	if (DO_OFFSET)
	{
	offset = ctx->Polygon.OffsetUnits * DEPTH_SCALE;
	z[0] = VERT_Z(v[0]);
	z[1] = VERT_Z(v[1]);
	z[2] = VERT_Z(v[2]);
	if (cc * cc > 1e-16) {
	GLfloat ic = 1.0 / cc;
	GLfloat ez = z[0] - z[2];
	GLfloat fz = z[1] - z[2];
	GLfloat a = eyfz - ezfy;
	GLfloat b = ezfx - exfz;
	GLfloat ac = a * ic;
	GLfloat bc = b * ic;
	if ( ac < 0.0f ) ac = -ac;
	if ( bc < 0.0f ) bc = -bc;
	offset += MAX2( ac, bc ) * ctx->Polygon.OffsetFactor / ctx->DrawBuffer->_MRD;
	}
	offset = ctx->DrawBuffer->_MRD (REVERSE_DEPTH ? -1.0 : 1.0);
	}
	}

	if (DO_FLAT) {
	if (HAVE_RGBA) {
	VERT_SAVE_RGBA( 0 );
	VERT_SAVE_RGBA( 1 );
	VERT_COPY_RGBA( v[0], v[2] );
	VERT_COPY_RGBA( v[1], v[2] );
	if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
	VERT_SAVE_SPEC( 0 );
	VERT_SAVE_SPEC( 1 );
	VERT_COPY_SPEC( v[0], v[2] );
	VERT_COPY_SPEC( v[1], v[2] );
	}
	}
	else {
	VERT_SAVE_IND( 0 );
	VERT_SAVE_IND( 1 );
	VERT_COPY_IND( v[0], v[2] );
	VERT_COPY_IND( v[1], v[2] );
	}
	}

	if (mode == GL_POINT) {
	if (DO_OFFSET && ctx->Polygon.OffsetPoint) {
	VERT_Z_ADD(v[0], offset);
	VERT_Z_ADD(v[1], offset);
	VERT_Z_ADD(v[2], offset);
	}
	if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
	SETUP_STENCIL(facing);
	UNFILLED_TRI( ctx, GL_POINT, e0, e1, e2 );
	UNSET_STENCIL(facing);
	} else {
	UNFILLED_TRI( ctx, GL_POINT, e0, e1, e2 );
	}
	} else if (mode == GL_LINE) {
	if (DO_OFFSET && ctx->Polygon.OffsetLine) {
	VERT_Z_ADD(v[0], offset);
	VERT_Z_ADD(v[1], offset);
	VERT_Z_ADD(v[2], offset);
	}
	if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
	SETUP_STENCIL(facing);
	UNFILLED_TRI( ctx, GL_LINE, e0, e1, e2 );
	UNSET_STENCIL(facing);
	} else {
	UNFILLED_TRI( ctx, GL_LINE, e0, e1, e2 );
	}
	} else {
	if (DO_OFFSET && ctx->Polygon.OffsetFill) {
	VERT_Z_ADD(v[0], offset);
	VERT_Z_ADD(v[1], offset);
	VERT_Z_ADD(v[2], offset);
	}
	if (DO_UNFILLED)
	RASTERIZE( GL_TRIANGLES );
	if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
	SETUP_STENCIL(facing);
	TRI( v[0], v[1], v[2] );
	UNSET_STENCIL(facing);
	} else {
	TRI( v[0], v[1], v[2] );
	}
	}

	if (DO_OFFSET)
	{
	VERT_SET_Z(v[0], z[0]);
	VERT_SET_Z(v[1], z[1]);
	VERT_SET_Z(v[2], z[2]);
	}

	if (DO_TWOSIDE && facing == 1)
	{
	if (HAVE_RGBA) {
	if (!DO_FLAT) {
	VERT_RESTORE_RGBA( 0 );
	VERT_RESTORE_RGBA( 1 );
	}
	VERT_RESTORE_RGBA( 2 );
	if (HAVE_SPEC) {
	if (!DO_FLAT) {
	VERT_RESTORE_SPEC( 0 );
	VERT_RESTORE_SPEC( 1 );
	}
	VERT_RESTORE_SPEC( 2 );
	}
	}
	else {
	if (!DO_FLAT) {
	VERT_RESTORE_IND( 0 );
	VERT_RESTORE_IND( 1 );
	}
	VERT_RESTORE_IND( 2 );
	}
	}


	if (DO_FLAT) {
	if (HAVE_RGBA) {
	VERT_RESTORE_RGBA( 0 );
	VERT_RESTORE_RGBA( 1 );
	if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
	VERT_RESTORE_SPEC( 0 );
	VERT_RESTORE_SPEC( 1 );
	}
	}
	else {
	VERT_RESTORE_IND( 0 );
	VERT_RESTORE_IND( 1 );
	}
	}
	}
	#endif

	#if DO_QUAD
	#if DO_FULL_QUAD
	static void TAG(quadr)( GLcontext *ctx,
	GLuint e0, GLuint e1, GLuint e2, GLuint e3 )
	{
	struct vertex_buffer *VB = &TNL_CONTEXT( ctx )->vb;
	VERTEX *v[4];
	GLfloat offset = 0;
	GLfloat z[4];
	GLenum mode = GL_FILL;
	GLuint facing = 0;
	LOCAL_VARS(4);

	v[0] = (VERTEX *)GET_VERTEX(e0);
	v[1] = (VERTEX *)GET_VERTEX(e1);
	v[2] = (VERTEX *)GET_VERTEX(e2);
	v[3] = (VERTEX *)GET_VERTEX(e3);

	if (DO_TWOSIDE \|\| DO_OFFSET \|\| DO_UNFILLED \|\| DO_TWOSTENCIL)
	{
	GLfloat ex = VERT_X(v[2]) - VERT_X(v[0]);
	GLfloat ey = VERT_Y(v[2]) - VERT_Y(v[0]);
	GLfloat fx = VERT_X(v[3]) - VERT_X(v[1]);
	GLfloat fy = VERT_Y(v[3]) - VERT_Y(v[1]);
	GLfloat cc = exfy - eyfx;

	if (DO_TWOSIDE \|\| DO_UNFILLED \|\| DO_TWOSTENCIL)
	{
	facing = AREA_IS_CCW( cc ) ^ ctx->Polygon._FrontBit;

	if (DO_UNFILLED) {
	if (facing) {
	mode = ctx->Polygon.BackMode;
	if (ctx->Polygon.CullFlag &&
	ctx->Polygon.CullFaceMode != GL_FRONT) {
	return;
	}
	} else {
	mode = ctx->Polygon.FrontMode;
	if (ctx->Polygon.CullFlag &&
	ctx->Polygon.CullFaceMode != GL_BACK) {
	return;
	}
	}
	}

	if (DO_TWOSIDE && facing == 1)
	{
	if (HAVE_RGBA) {
	GLfloat (*vbcolor)[4] = VB->ColorPtr[1]->data;
	(void)vbcolor;

	if (HAVE_BACK_COLORS) {
	if (!DO_FLAT) {
	VERT_SAVE_RGBA( 0 );
	VERT_SAVE_RGBA( 1 );
	VERT_SAVE_RGBA( 2 );
	VERT_COPY_RGBA1( v[0] );
	VERT_COPY_RGBA1( v[1] );
	VERT_COPY_RGBA1( v[2] );
	}
	VERT_SAVE_RGBA( 3 );
	VERT_COPY_RGBA1( v[3] );
	if (HAVE_SPEC) {
	if (!DO_FLAT) {
	VERT_SAVE_SPEC( 0 );
	VERT_SAVE_SPEC( 1 );
	VERT_SAVE_SPEC( 2 );
	VERT_COPY_SPEC1( v[0] );
	VERT_COPY_SPEC1( v[1] );
	VERT_COPY_SPEC1( v[2] );
	}
	VERT_SAVE_SPEC( 3 );
	VERT_COPY_SPEC1( v[3] );
	}
	}
	else {
	if (!DO_FLAT) {
	VERT_SAVE_RGBA( 0 );
	VERT_SAVE_RGBA( 1 );
	VERT_SAVE_RGBA( 2 );
	}
	VERT_SAVE_RGBA( 3 );

	if (VB->ColorPtr[1]->stride) {
	if (!DO_FLAT) {
	VERT_SET_RGBA( v[0], vbcolor[e0] );
	VERT_SET_RGBA( v[1], vbcolor[e1] );
	VERT_SET_RGBA( v[2], vbcolor[e2] );
	}
	VERT_SET_RGBA( v[3], vbcolor[e3] );
	}
	else {
	if (!DO_FLAT) {
	VERT_SET_RGBA( v[0], vbcolor[0] );
	VERT_SET_RGBA( v[1], vbcolor[0] );
	VERT_SET_RGBA( v[2], vbcolor[0] );
	}
	VERT_SET_RGBA( v[3], vbcolor[0] );
	}

	if (HAVE_SPEC && VB->SecondaryColorPtr[1]) {
	GLfloat (*vbspec)[4] = VB->SecondaryColorPtr[1]->data;
	ASSERT(VB->SecondaryColorPtr[1]->stride==4*sizeof(GLfloat));

	if (!DO_FLAT) {
	VERT_SAVE_SPEC( 0 );
	VERT_SAVE_SPEC( 1 );
	VERT_SAVE_SPEC( 2 );
	VERT_SET_SPEC( v[0], vbspec[e0] );
	VERT_SET_SPEC( v[1], vbspec[e1] );
	VERT_SET_SPEC( v[2], vbspec[e2] );
	}
	VERT_SAVE_SPEC( 3 );
	VERT_SET_SPEC( v[3], vbspec[e3] );
	}
	}
	}
	else {
	GLfloat vbindex = (GLfloat )VB->IndexPtr[1]->data;
	if (!DO_FLAT) {
	VERT_SAVE_IND( 0 );
	VERT_SAVE_IND( 1 );
	VERT_SAVE_IND( 2 );
	VERT_SET_IND( v[0], vbindex[e0] );
	VERT_SET_IND( v[1], vbindex[e1] );
	VERT_SET_IND( v[2], vbindex[e2] );
	}
	VERT_SAVE_IND( 3 );
	VERT_SET_IND( v[3], vbindex[e3] );
	}
	}
	}


	if (DO_OFFSET)
	{
	offset = ctx->Polygon.OffsetUnits * DEPTH_SCALE;
	z[0] = VERT_Z(v[0]);
	z[1] = VERT_Z(v[1]);
	z[2] = VERT_Z(v[2]);
	z[3] = VERT_Z(v[3]);
	if (cc * cc > 1e-16) {
	GLfloat ez = z[2] - z[0];
	GLfloat fz = z[3] - z[1];
	GLfloat a = eyfz - ezfy;
	GLfloat b = ezfx - exfz;
	GLfloat ic = 1.0 / cc;
	GLfloat ac = a * ic;
	GLfloat bc = b * ic;
	if ( ac < 0.0f ) ac = -ac;
	if ( bc < 0.0f ) bc = -bc;
	offset += MAX2( ac, bc ) * ctx->Polygon.OffsetFactor / ctx->DrawBuffer->_MRD;
	}
	offset = ctx->DrawBuffer->_MRD (REVERSE_DEPTH ? -1.0 : 1.0);
	}
	}

	if (DO_FLAT) {
	if (HAVE_RGBA) {
	VERT_SAVE_RGBA( 0 );
	VERT_SAVE_RGBA( 1 );
	VERT_SAVE_RGBA( 2 );
	VERT_COPY_RGBA( v[0], v[3] );
	VERT_COPY_RGBA( v[1], v[3] );
	VERT_COPY_RGBA( v[2], v[3] );
	if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
	VERT_SAVE_SPEC( 0 );
	VERT_SAVE_SPEC( 1 );
	VERT_SAVE_SPEC( 2 );
	VERT_COPY_SPEC( v[0], v[3] );
	VERT_COPY_SPEC( v[1], v[3] );
	VERT_COPY_SPEC( v[2], v[3] );
	}
	}
	else {
	VERT_SAVE_IND( 0 );
	VERT_SAVE_IND( 1 );
	VERT_SAVE_IND( 2 );
	VERT_COPY_IND( v[0], v[3] );
	VERT_COPY_IND( v[1], v[3] );
	VERT_COPY_IND( v[2], v[3] );
	}
	}

	if (mode == GL_POINT) {
	if (( DO_OFFSET) && ctx->Polygon.OffsetPoint) {
	VERT_Z_ADD(v[0], offset);
	VERT_Z_ADD(v[1], offset);
	VERT_Z_ADD(v[2], offset);
	VERT_Z_ADD(v[3], offset);
	}
	if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
	SETUP_STENCIL(facing);
	UNFILLED_QUAD( ctx, GL_POINT, e0, e1, e2, e3 );
	UNSET_STENCIL(facing);
	} else {
	UNFILLED_QUAD( ctx, GL_POINT, e0, e1, e2, e3 );
	}
	} else if (mode == GL_LINE) {
	if (DO_OFFSET && ctx->Polygon.OffsetLine) {
	VERT_Z_ADD(v[0], offset);
	VERT_Z_ADD(v[1], offset);
	VERT_Z_ADD(v[2], offset);
	VERT_Z_ADD(v[3], offset);
	}
	if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
	SETUP_STENCIL(facing);
	UNFILLED_QUAD( ctx, GL_LINE, e0, e1, e2, e3 );
	UNSET_STENCIL(facing);
	} else {
	UNFILLED_QUAD( ctx, GL_LINE, e0, e1, e2, e3 );
	}
	} else {
	if (DO_OFFSET && ctx->Polygon.OffsetFill) {
	VERT_Z_ADD(v[0], offset);
	VERT_Z_ADD(v[1], offset);
	VERT_Z_ADD(v[2], offset);
	VERT_Z_ADD(v[3], offset);
	}
	RASTERIZE( GL_QUADS );
	if (DO_TWOSTENCIL && !HAVE_STENCIL_TWOSIDE && ctx->Stencil.TestTwoSide) {
	SETUP_STENCIL(facing);
	QUAD( (v[0]), (v[1]), (v[2]), (v[3]) );
	UNSET_STENCIL(facing);
	} else {
	QUAD( (v[0]), (v[1]), (v[2]), (v[3]) );
	}
	}

	if (DO_OFFSET)
	{
	VERT_SET_Z(v[0], z[0]);
	VERT_SET_Z(v[1], z[1]);
	VERT_SET_Z(v[2], z[2]);
	VERT_SET_Z(v[3], z[3]);
	}

	if (DO_TWOSIDE && facing == 1)
	{
	if (HAVE_RGBA) {
	if (!DO_FLAT) {
	VERT_RESTORE_RGBA( 0 );
	VERT_RESTORE_RGBA( 1 );
	VERT_RESTORE_RGBA( 2 );
	}
	VERT_RESTORE_RGBA( 3 );
	if (HAVE_SPEC) {
	if (!DO_FLAT) {
	VERT_RESTORE_SPEC( 0 );
	VERT_RESTORE_SPEC( 1 );
	VERT_RESTORE_SPEC( 2 );
	}
	VERT_RESTORE_SPEC( 3 );
	}
	}
	else {
	if (!DO_FLAT) {
	VERT_RESTORE_IND( 0 );
	VERT_RESTORE_IND( 1 );
	VERT_RESTORE_IND( 2 );
	}
	VERT_RESTORE_IND( 3 );
	}
	}


	if (DO_FLAT) {
	if (HAVE_RGBA) {
	VERT_RESTORE_RGBA( 0 );
	VERT_RESTORE_RGBA( 1 );
	VERT_RESTORE_RGBA( 2 );
	if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
	VERT_RESTORE_SPEC( 0 );
	VERT_RESTORE_SPEC( 1 );
	VERT_RESTORE_SPEC( 2 );
	}
	}
	else {
	VERT_RESTORE_IND( 0 );
	VERT_RESTORE_IND( 1 );
	VERT_RESTORE_IND( 2 );
	}
	}
	}
	#else
	static void TAG(quadr)( GLcontext *ctx, GLuint e0,
	GLuint e1, GLuint e2, GLuint e3 )
	{
	if (DO_UNFILLED) {
	struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
	GLubyte ef1 = VB->EdgeFlag[e1];
	GLubyte ef3 = VB->EdgeFlag[e3];
	VB->EdgeFlag[e1] = 0;
	TAG(triangle)( ctx, e0, e1, e3 );
	VB->EdgeFlag[e1] = ef1;
	VB->EdgeFlag[e3] = 0;
	TAG(triangle)( ctx, e1, e2, e3 );
	VB->EdgeFlag[e3] = ef3;
	} else {
	TAG(triangle)( ctx, e0, e1, e3 );
	TAG(triangle)( ctx, e1, e2, e3 );
	}
	}
	#endif
	#endif

	#if DO_LINE
	static void TAG(line)( GLcontext *ctx, GLuint e0, GLuint e1 )
	{
	struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
	VERTEX *v[2];
	LOCAL_VARS(2);

	v[0] = (VERTEX *)GET_VERTEX(e0);
	v[1] = (VERTEX *)GET_VERTEX(e1);

	if (DO_FLAT) {
	if (HAVE_RGBA) {
	VERT_SAVE_RGBA( 0 );
	VERT_COPY_RGBA( v[0], v[1] );
	if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
	VERT_SAVE_SPEC( 0 );
	VERT_COPY_SPEC( v[0], v[1] );
	}
	}
	else {
	VERT_SAVE_IND( 0 );
	VERT_COPY_IND( v[0], v[1] );
	}
	}

	LINE( v[0], v[1] );

	if (DO_FLAT) {
	if (HAVE_RGBA) {
	VERT_RESTORE_RGBA( 0 );

	if (HAVE_SPEC && VB->SecondaryColorPtr[0]) {
	VERT_RESTORE_SPEC( 0 );
	}
	}
	else {
	VERT_RESTORE_IND( 0 );
	}
	}
	}
	#endif

	#if DO_POINTS
	static void TAG(points)( GLcontext *ctx, GLuint first, GLuint last )
	{
	struct vertex_buffer *VB = &TNL_CONTEXT( ctx )->vb;
	GLuint i;
	LOCAL_VARS(1);

	if (VB->Elts == 0) {
	for ( i = first ; i < last ; i++ ) {
	if ( VB->ClipMask[i] == 0 ) {
	VERTEX v = (VERTEX )GET_VERTEX(i);
	POINT( v );
	}
	}
	} else {
	for ( i = first ; i < last ; i++ ) {
	GLuint e = VB->Elts[i];
	if ( VB->ClipMask[e] == 0 ) {
	VERTEX v = (VERTEX )GET_VERTEX(e);
	POINT( v );
	}
	}
	}
	}
	#endif

	static void TAG(init)( void )
	{
	#if DO_QUAD
	TAB[IND].quad = TAG(quadr);
	#endif
	#if DO_TRI
	TAB[IND].triangle = TAG(triangle);
	#endif
	#if DO_LINE
	TAB[IND].line = TAG(line);
	#endif
	#if DO_POINTS
	TAB[IND].points = TAG(points);
	#endif
	}

	#undef IND
	#undef TAG

	#if HAVE_RGBA
	#undef VERT_SET_IND
	#undef VERT_COPY_IND
	#undef VERT_SAVE_IND
	#undef VERT_RESTORE_IND
	#if HAVE_BACK_COLORS
	#undef VERT_SET_RGBA
	#endif
	#else
	#undef VERT_SET_RGBA
	#undef VERT_COPY_RGBA
	#undef VERT_SAVE_RGBA
	#undef VERT_RESTORE_RGBA
	#if HAVE_BACK_COLORS
	#undef VERT_SET_IND
	#endif
	#endif

	#if !HAVE_SPEC
	#undef VERT_SET_SPEC
	#undef VERT_COPY_SPEC
	#undef VERT_SAVE_SPEC
	#undef VERT_RESTORE_SPEC
	#if HAVE_BACK_COLORS
	#undef VERT_COPY_SPEC1
	#endif
	#else
	#if HAVE_BACK_COLORS
	#undef VERT_SET_SPEC
	#endif
	#endif

	#if !HAVE_BACK_COLORS
	#undef VERT_COPY_SPEC1
	#undef VERT_COPY_IND1
	#undef VERT_COPY_RGBA1
	#endif

	#ifndef INSANE_VERTICES
	#undef VERT_SET_Z
	#undef VERT_Z_ADD
	#endif