t_dd_tritmp.h

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

      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