path: root/src/mesa/drivers/dri/i915/intel_tris.c

/**************************************************************************
 * 
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
 * 
 **************************************************************************/

#include "glheader.h"
#include "context.h"
#include "macros.h"
#include "enums.h"
#include "dd.h"

#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "tnl/t_context.h"
#include "tnl/t_pipeline.h"
#include "tnl/t_vertex.h"

#include "intel_screen.h"
#include "intel_tris.h"
#include "intel_batchbuffer.h"
#include "intel_reg.h"
#include "intel_span.h"

static void intelRenderPrimitive( GLcontext *ctx, GLenum prim );
static void intelRasterPrimitive( GLcontext *ctx, GLenum rprim, GLuint hwprim );

/***********************************************************************
 *                    Emit primitives as inline vertices               *
 ***********************************************************************/

#ifdef __i386__
#define COPY_DWORDS( j, vb, vertsize, v )			\
do {								\
   int __tmp;							\
   __asm__ __volatile__( "rep ; movsl"				\
			 : "=%c" (j), "=D" (vb), "=S" (__tmp)	\
			 : "0" (vertsize),			\
			 "D" ((long)vb),			\
			 "S" ((long)v) );			\
} while (0)
#else
#define COPY_DWORDS( j, vb, vertsize, v )	\
do {						\
   if (0) fprintf(stderr, "\n");	\
   for ( j = 0 ; j < vertsize ; j++ ) {		\
      if (0) fprintf(stderr, "   -- v(%d): %x/%f\n",j,	\
	      ((GLuint *)v)[j],			\
	      ((GLfloat *)v)[j]);		\
      vb[j] = ((GLuint *)v)[j];			\
   }						\
   vb += vertsize;				\
} while (0)
#endif

static void __inline__ intel_draw_quad( intelContextPtr intel,
					intelVertexPtr v0,
					intelVertexPtr v1,
					intelVertexPtr v2,
					intelVertexPtr v3 )
{
   GLuint vertsize = intel->vertex_size;
   GLuint *vb = intelExtendInlinePrimitive( intel, 6 * vertsize );
   int j;

   COPY_DWORDS( j, vb, vertsize, v0 );
   COPY_DWORDS( j, vb, vertsize, v1 );
   COPY_DWORDS( j, vb, vertsize, v3 );
   COPY_DWORDS( j, vb, vertsize, v1 );
   COPY_DWORDS( j, vb, vertsize, v2 );
   COPY_DWORDS( j, vb, vertsize, v3 );
}

static void __inline__ intel_draw_triangle( intelContextPtr intel,
					    intelVertexPtr v0,
					    intelVertexPtr v1,
					    intelVertexPtr v2 )
{
   GLuint vertsize = intel->vertex_size;
   GLuint *vb = intelExtendInlinePrimitive( intel, 3 * vertsize );
   int j;
   
   COPY_DWORDS( j, vb, vertsize, v0 );
   COPY_DWORDS( j, vb, vertsize, v1 );
   COPY_DWORDS( j, vb, vertsize, v2 );
}


static __inline__ void intel_draw_line( intelContextPtr intel,
					intelVertexPtr v0,
					intelVertexPtr v1 )
{
   GLuint vertsize = intel->vertex_size;
   GLuint *vb = intelExtendInlinePrimitive( intel, 2 * vertsize );
   int j;

   COPY_DWORDS( j, vb, vertsize, v0 );
   COPY_DWORDS( j, vb, vertsize, v1 );
}


static __inline__ void intel_draw_point( intelContextPtr intel,
					 intelVertexPtr v0 )
{
   GLuint vertsize = intel->vertex_size;
   GLuint *vb = intelExtendInlinePrimitive( intel, vertsize );
   int j;

   /* Adjust for sub pixel position -- still required for conform. */
   *(float *)&vb[0] = v0->v.x - 0.125;
   *(float *)&vb[1] = v0->v.y - 0.125;
   for (j = 2 ; j < vertsize ; j++)
     vb[j] = v0->ui[j];
}



/***********************************************************************
 *                Fixup for ARB_point_parameters                       *
 ***********************************************************************/

static void intel_atten_point( intelContextPtr intel, intelVertexPtr v0 )
{
   GLcontext *ctx = &intel->ctx;
   GLfloat psz[4], col[4], restore_psz, restore_alpha;

   _tnl_get_attr( ctx, v0, _TNL_ATTRIB_POINTSIZE, psz );
   _tnl_get_attr( ctx, v0, _TNL_ATTRIB_COLOR0, col );

   restore_psz = psz[0];
   restore_alpha = col[3];

   if (psz[0] >= ctx->Point.Threshold) {
      psz[0] = MIN2(psz[0], ctx->Point.MaxSize);
   }
   else {
      GLfloat dsize = psz[0] / ctx->Point.Threshold;
      psz[0] = MAX2(ctx->Point.Threshold, ctx->Point.MinSize);
      col[3] *= dsize * dsize;
   }

   if (psz[0] < 1.0)
      psz[0] = 1.0;

   if (restore_psz != psz[0] || restore_alpha != col[3]) {
      _tnl_set_attr( ctx, v0, _TNL_ATTRIB_POINTSIZE, psz);
      _tnl_set_attr( ctx, v0, _TNL_ATTRIB_COLOR0, col);
   
      intel_draw_point( intel, v0 );

      psz[0] = restore_psz;
      col[3] = restore_alpha;

      _tnl_set_attr( ctx, v0, _TNL_ATTRIB_POINTSIZE, psz);
      _tnl_set_attr( ctx, v0, _TNL_ATTRIB_COLOR0, col);
   }
   else
      intel_draw_point( intel, v0 );
}





/***********************************************************************
 *                Fixup for I915 WPOS texture coordinate                *
 ***********************************************************************/



static void intel_wpos_triangle( intelContextPtr intel,
				 intelVertexPtr v0,
				 intelVertexPtr v1,
				 intelVertexPtr v2 )
{
   GLuint offset = intel->wpos_offset;
   GLuint size = intel->wpos_size;
   
   __memcpy( ((char *)v0) + offset, v0, size );
   __memcpy( ((char *)v1) + offset, v1, size );
   __memcpy( ((char *)v2) + offset, v2, size );

   intel_draw_triangle( intel, v0, v1, v2 );
}


static void intel_wpos_line( intelContextPtr intel,
			     intelVertexPtr v0,
			     intelVertexPtr v1 )
{
   GLuint offset = intel->wpos_offset;
   GLuint size = intel->wpos_size;

   __memcpy( ((char *)v0) + offset, v0, size );
   __memcpy( ((char *)v1) + offset, v1, size );

   intel_draw_line( intel, v0, v1 );
}


static void intel_wpos_point( intelContextPtr intel,
			      intelVertexPtr v0 )
{
   GLuint offset = intel->wpos_offset;
   GLuint size = intel->wpos_size;

   __memcpy( ((char *)v0) + offset, v0, size );

   intel_draw_point( intel, v0 );
}






/***********************************************************************
 *          Macros for t_dd_tritmp.h to draw basic primitives          *
 ***********************************************************************/

#define TRI( a, b, c )				\
do { 						\
   if (DO_FALLBACK)				\
      intel->draw_tri( intel, a, b, c );	\
   else						\
      intel_draw_triangle( intel, a, b, c );	\
} while (0)

#define QUAD( a, b, c, d )			\
do { 						\
   if (DO_FALLBACK) {				\
      intel->draw_tri( intel, a, b, d );	\
      intel->draw_tri( intel, b, c, d );	\
   } else					\
      intel_draw_quad( intel, a, b, c, d );	\
} while (0)

#define LINE( v0, v1 )				\
do { 						\
   if (DO_FALLBACK)				\
      intel->draw_line( intel, v0, v1 );	\
   else						\
      intel_draw_line( intel, v0, v1 );		\
} while (0)

#define POINT( v0 )				\
do { 						\
   if (DO_FALLBACK)				\
      intel->draw_point( intel, v0 );		\
   else						\
      intel_draw_point( intel, v0 );		\
} while (0)


/***********************************************************************
 *              Build render functions from dd templates               *
 ***********************************************************************/

#define INTEL_OFFSET_BIT 	0x01
#define INTEL_TWOSIDE_BIT	0x02
#define INTEL_UNFILLED_BIT	0x04
#define INTEL_FALLBACK_BIT	0x08
#define INTEL_MAX_TRIFUNC	0x10


static struct {
   tnl_points_func	        points;
   tnl_line_func		line;
   tnl_triangle_func	triangle;
   tnl_quad_func		quad;
} rast_tab[INTEL_MAX_TRIFUNC];


#define DO_FALLBACK (IND & INTEL_FALLBACK_BIT)
#define DO_OFFSET   (IND & INTEL_OFFSET_BIT)
#define DO_UNFILLED (IND & INTEL_UNFILLED_BIT)
#define DO_TWOSIDE  (IND & INTEL_TWOSIDE_BIT)
#define DO_FLAT      0
#define DO_TRI       1
#define DO_QUAD      1
#define DO_LINE      1
#define DO_POINTS    1
#define DO_FULL_QUAD 1

#define HAVE_RGBA         1
#define HAVE_SPEC         1
#define HAVE_BACK_COLORS  0
#define HAVE_HW_FLATSHADE 1
#define VERTEX            intelVertex
#define TAB               rast_tab

/* Only used to pull back colors into vertices (ie, we know color is
 * floating point).
 */
#define INTEL_COLOR( dst, src )				\
do {							\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[0], (src)[2]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[1], (src)[1]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[2], (src)[0]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[3], (src)[3]);	\
} while (0)

#define INTEL_SPEC( dst, src )				\
do {							\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[0], (src)[2]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[1], (src)[1]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[2], (src)[0]);	\
} while (0)


#define DEPTH_SCALE intel->polygon_offset_scale
#define UNFILLED_TRI unfilled_tri
#define UNFILLED_QUAD unfilled_quad
#define VERT_X(_v) _v->v.x
#define VERT_Y(_v) _v->v.y
#define VERT_Z(_v) _v->v.z
#define AREA_IS_CCW( a ) (a > 0)
#define GET_VERTEX(e) (intel->verts + (e * intel->vertex_size * sizeof(GLuint)))

#define VERT_SET_RGBA( v, c )    if (coloroffset) INTEL_COLOR( v->ub4[coloroffset], c )
#define VERT_COPY_RGBA( v0, v1 ) if (coloroffset) v0->ui[coloroffset] = v1->ui[coloroffset]
#define VERT_SAVE_RGBA( idx )    if (coloroffset) color[idx] = v[idx]->ui[coloroffset]
#define VERT_RESTORE_RGBA( idx ) if (coloroffset) v[idx]->ui[coloroffset] = color[idx]

#define VERT_SET_SPEC( v, c )    if (specoffset) INTEL_SPEC( v->ub4[specoffset], c )
#define VERT_COPY_SPEC( v0, v1 ) if (specoffset) COPY_3V(v0->ub4[specoffset], v1->ub4[specoffset])
#define VERT_SAVE_SPEC( idx )    if (specoffset) spec[idx] = v[idx]->ui[specoffset]
#define VERT_RESTORE_SPEC( idx ) if (specoffset) v[idx]->ui[specoffset] = spec[idx]

#define LOCAL_VARS(n)							\
   intelContextPtr intel = INTEL_CONTEXT(ctx);				\
   GLuint color[n], spec[n];						\
   GLuint coloroffset = intel->coloroffset;		\
   GLboolean specoffset = intel->specoffset;			\
   (void) color; (void) spec; (void) coloroffset; (void) specoffset;


/***********************************************************************
 *                Helpers for rendering unfilled primitives            *
 ***********************************************************************/

static const GLuint hw_prim[GL_POLYGON+1] = {
   PRIM3D_POINTLIST,
   PRIM3D_LINELIST,
   PRIM3D_LINELIST,
   PRIM3D_LINELIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST
};

#define RASTERIZE(x) intelRasterPrimitive( ctx, x, hw_prim[x] )
#define RENDER_PRIMITIVE intel->render_primitive
#define TAG(x) x
#define IND INTEL_FALLBACK_BIT
#include "tnl_dd/t_dd_unfilled.h"
#undef IND

/***********************************************************************
 *                      Generate GL render functions                   *
 ***********************************************************************/

#define IND (0)
#define TAG(x) x
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_OFFSET_BIT)
#define TAG(x) x##_offset
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT)
#define TAG(x) x##_twoside
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT|INTEL_OFFSET_BIT)
#define TAG(x) x##_twoside_offset
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_UNFILLED_BIT)
#define TAG(x) x##_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_OFFSET_BIT|INTEL_UNFILLED_BIT)
#define TAG(x) x##_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT|INTEL_UNFILLED_BIT)
#define TAG(x) x##_twoside_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT|INTEL_OFFSET_BIT|INTEL_UNFILLED_BIT)
#define TAG(x) x##_twoside_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_FALLBACK_BIT)
#define TAG(x) x##_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_OFFSET_BIT|INTEL_FALLBACK_BIT)
#define TAG(x) x##_offset_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT|INTEL_FALLBACK_BIT)
#define TAG(x) x##_twoside_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT|INTEL_OFFSET_BIT|INTEL_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_UNFILLED_BIT|INTEL_FALLBACK_BIT)
#define TAG(x) x##_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_OFFSET_BIT|INTEL_UNFILLED_BIT|INTEL_FALLBACK_BIT)
#define TAG(x) x##_offset_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT|INTEL_UNFILLED_BIT|INTEL_FALLBACK_BIT)
#define TAG(x) x##_twoside_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT|INTEL_OFFSET_BIT|INTEL_UNFILLED_BIT| \
	     INTEL_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"


static void init_rast_tab( void )
{
   init();
   init_offset();
   init_twoside();
   init_twoside_offset();
   init_unfilled();
   init_offset_unfilled();
   init_twoside_unfilled();
   init_twoside_offset_unfilled();
   init_fallback();
   init_offset_fallback();
   init_twoside_fallback();
   init_twoside_offset_fallback();
   init_unfilled_fallback();
   init_offset_unfilled_fallback();
   init_twoside_unfilled_fallback();
   init_twoside_offset_unfilled_fallback();
}


/***********************************************************************
 *                    Rasterization fallback helpers                   *
 ***********************************************************************/


/* This code is hit only when a mix of accelerated and unaccelerated
 * primitives are being drawn, and only for the unaccelerated
 * primitives.
 */
static void
intel_fallback_tri( intelContextPtr intel,
		   intelVertex *v0,
		   intelVertex *v1,
		   intelVertex *v2 )
{
   GLcontext *ctx = &intel->ctx;
   SWvertex v[3];

   if (0)
      fprintf(stderr, "\n%s\n", __FUNCTION__);

   _swsetup_Translate( ctx, v0, &v[0] );
   _swsetup_Translate( ctx, v1, &v[1] );
   _swsetup_Translate( ctx, v2, &v[2] );
   intelSpanRenderStart( ctx );
   _swrast_Triangle( ctx, &v[0], &v[1], &v[2] );
   intelSpanRenderFinish( ctx );
}


static void
intel_fallback_line( intelContextPtr intel,
		    intelVertex *v0,
		    intelVertex *v1 )
{
   GLcontext *ctx = &intel->ctx;
   SWvertex v[2];

   if (0)
      fprintf(stderr, "\n%s\n", __FUNCTION__);

   _swsetup_Translate( ctx, v0, &v[0] );
   _swsetup_Translate( ctx, v1, &v[1] );
   intelSpanRenderStart( ctx );
   _swrast_Line( ctx, &v[0], &v[1] );
   intelSpanRenderFinish( ctx );
}


static void
intel_fallback_point( intelContextPtr intel,
		     intelVertex *v0 )
{
   GLcontext *ctx = &intel->ctx;
   SWvertex v[1];

   if (0)
      fprintf(stderr, "\n%s\n", __FUNCTION__);

   _swsetup_Translate( ctx, v0, &v[0] );
   intelSpanRenderStart( ctx );
   _swrast_Point( ctx, &v[0] );
   intelSpanRenderFinish( ctx );
}



/**********************************************************************/
/*               Render unclipped begin/end objects                   */
/**********************************************************************/

#define IND 0
#define V(x) (intelVertex *)(vertptr + ((x)*vertsize*sizeof(GLuint)))
#define RENDER_POINTS( start, count )	\
   for ( ; start < count ; start++) POINT( V(ELT(start)) );
#define RENDER_LINE( v0, v1 )         LINE( V(v0), V(v1) )
#define RENDER_TRI(  v0, v1, v2 )     TRI(  V(v0), V(v1), V(v2) )
#define RENDER_QUAD( v0, v1, v2, v3 ) QUAD( V(v0), V(v1), V(v2), V(v3) )
#define INIT(x) intelRenderPrimitive( ctx, x )
#undef LOCAL_VARS
#define LOCAL_VARS						\
    intelContextPtr intel = INTEL_CONTEXT(ctx);			\
    GLubyte *vertptr = (GLubyte *)intel->verts;			\
    const GLuint vertsize = intel->vertex_size;       	\
    const GLuint * const elt = TNL_CONTEXT(ctx)->vb.Elts;	\
    (void) elt;
#define RESET_STIPPLE
#define RESET_OCCLUSION
#define PRESERVE_VB_DEFS
#define ELT(x) x
#define TAG(x) intel_##x##_verts
#include "tnl/t_vb_rendertmp.h"
#undef ELT
#undef TAG
#define TAG(x) intel_##x##_elts
#define ELT(x) elt[x]
#include "tnl/t_vb_rendertmp.h"

/**********************************************************************/
/*                   Render clipped primitives                        */
/**********************************************************************/



static void intelRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
				   GLuint n )
{
   intelContextPtr intel = INTEL_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
   GLuint prim = intel->render_primitive;

   /* Render the new vertices as an unclipped polygon.
    */
   {
      GLuint *tmp = VB->Elts;
      VB->Elts = (GLuint *)elts;
      tnl->Driver.Render.PrimTabElts[GL_POLYGON]( ctx, 0, n, 
						  PRIM_BEGIN|PRIM_END );
      VB->Elts = tmp;
   }

   /* Restore the render primitive
    */
   if (prim != GL_POLYGON)
      tnl->Driver.Render.PrimitiveNotify( ctx, prim );
}

static void intelRenderClippedLine( GLcontext *ctx, GLuint ii, GLuint jj )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);

   tnl->Driver.Render.Line( ctx, ii, jj );
}

static void intelFastRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
				       GLuint n )
{
   intelContextPtr intel = INTEL_CONTEXT( ctx );
   const GLuint vertsize = intel->vertex_size;
   GLuint *vb = intelExtendInlinePrimitive( intel, (n-2) * 3 * vertsize );
   GLubyte *vertptr = (GLubyte *)intel->verts;
   const GLuint *start = (const GLuint *)V(elts[0]);
   int i,j;

   for (i = 2 ; i < n ; i++) {
      COPY_DWORDS( j, vb, vertsize, V(elts[i-1]) );
      COPY_DWORDS( j, vb, vertsize, V(elts[i]) );
      COPY_DWORDS( j, vb, vertsize, start );
   }
}

/**********************************************************************/
/*                    Choose render functions                         */
/**********************************************************************/




#define POINT_FALLBACK (0)
#define LINE_FALLBACK (DD_LINE_STIPPLE)
#define TRI_FALLBACK (0)
#define ANY_FALLBACK_FLAGS (POINT_FALLBACK|LINE_FALLBACK|TRI_FALLBACK|\
                            DD_TRI_STIPPLE|DD_POINT_ATTEN)
#define ANY_RASTER_FLAGS (DD_TRI_LIGHT_TWOSIDE|DD_TRI_OFFSET|DD_TRI_UNFILLED)

void intelChooseRenderState(GLcontext *ctx)
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   intelContextPtr intel = INTEL_CONTEXT(ctx);
   GLuint flags = ctx->_TriangleCaps;
   struct fragment_program *program = ctx->FragmentProgram._Current;
   GLboolean have_wpos = (program && (program->InputsRead & FRAG_BIT_WPOS));
   GLuint index = 0;

   if (INTEL_DEBUG & DEBUG_STATE)
     fprintf(stderr,"\n%s\n",__FUNCTION__);

   if ((flags & (ANY_FALLBACK_FLAGS|ANY_RASTER_FLAGS)) || have_wpos) {

      if (flags & ANY_RASTER_FLAGS) {
	 if (flags & DD_TRI_LIGHT_TWOSIDE)    index |= INTEL_TWOSIDE_BIT;
	 if (flags & DD_TRI_OFFSET)	      index |= INTEL_OFFSET_BIT;
	 if (flags & DD_TRI_UNFILLED)	      index |= INTEL_UNFILLED_BIT;
      }

      if (have_wpos) {
	 intel->draw_point = intel_wpos_point;
	 intel->draw_line = intel_wpos_line;
	 intel->draw_tri = intel_wpos_triangle;

	 /* Make sure these get called:
	  */
	 index |= INTEL_FALLBACK_BIT;
      }
      else {
	 intel->draw_point = intel_draw_point;
	 intel->draw_line = intel_draw_line;
	 intel->draw_tri = intel_draw_triangle;
      }

      /* Hook in fallbacks for specific primitives.
       */
      if (flags & ANY_FALLBACK_FLAGS)
      {
	 if (flags & POINT_FALLBACK)
	    intel->draw_point = intel_fallback_point;

	 if (flags & LINE_FALLBACK)
	    intel->draw_line = intel_fallback_line;

	 if (flags & TRI_FALLBACK)
	    intel->draw_tri = intel_fallback_tri;

	 if ((flags & DD_TRI_STIPPLE) && !intel->hw_stipple) 
	    intel->draw_tri = intel_fallback_tri;

	 if (flags & DD_POINT_ATTEN)
	    intel->draw_point = intel_atten_point;

	 index |= INTEL_FALLBACK_BIT;
      }
   }

   if (intel->RenderIndex != index) {
      intel->RenderIndex = index;

      tnl->Driver.Render.Points = rast_tab[index].points;
      tnl->Driver.Render.Line = rast_tab[index].line;
      tnl->Driver.Render.Triangle = rast_tab[index].triangle;
      tnl->Driver.Render.Quad = rast_tab[index].quad;

      if (index == 0) {
	 tnl->Driver.Render.PrimTabVerts = intel_render_tab_verts;
	 tnl->Driver.Render.PrimTabElts = intel_render_tab_elts;
	 tnl->Driver.Render.ClippedLine = line; /* from tritmp.h */
	 tnl->Driver.Render.ClippedPolygon = intelFastRenderClippedPoly;
      } else {
	 tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
	 tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
	 tnl->Driver.Render.ClippedLine = intelRenderClippedLine;
	 tnl->Driver.Render.ClippedPolygon = intelRenderClippedPoly;
      }
   }
}

static const GLenum reduced_prim[GL_POLYGON+1] = {
   GL_POINTS,
   GL_LINES,
   GL_LINES,
   GL_LINES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES
};


/**********************************************************************/
/*                 High level hooks for t_vb_render.c                 */
/**********************************************************************/




static void intelRunPipeline( GLcontext *ctx )
{
   intelContextPtr intel = INTEL_CONTEXT(ctx);

   if (intel->NewGLState) {
      if (intel->NewGLState & _NEW_TEXTURE) {
	 intel->vtbl.update_texture_state( intel ); 
      }

      if (!intel->Fallback) {
	 if (intel->NewGLState & _INTEL_NEW_RENDERSTATE)
	    intelChooseRenderState( ctx );
      }

      intel->NewGLState = 0;
   }

   _tnl_run_pipeline( ctx );
}

static void intelRenderStart( GLcontext *ctx )
{
   INTEL_CONTEXT(ctx)->vtbl.render_start( INTEL_CONTEXT(ctx) );
}

static void intelRenderFinish( GLcontext *ctx )
{
   if (INTEL_CONTEXT(ctx)->RenderIndex & INTEL_FALLBACK_BIT)
      _swrast_flush( ctx );
}




 /* System to flush dma and emit state changes based on the rasterized
  * primitive.
  */
static void intelRasterPrimitive( GLcontext *ctx, GLenum rprim, GLuint hwprim )
{
   intelContextPtr intel = INTEL_CONTEXT(ctx);

   if (0)
      fprintf(stderr, "%s %s %x\n", __FUNCTION__, 
	      _mesa_lookup_enum_by_nr(rprim), hwprim);

   intel->vtbl.reduced_primitive_state( intel, rprim );
    
   /* Start a new primitive.  Arrange to have it flushed later on.
    */
   if (hwprim != intel->prim.primitive) 
      intelStartInlinePrimitive( intel, hwprim );
}


 /* 
  */
 static void intelRenderPrimitive( GLcontext *ctx, GLenum prim )
 {
    intelContextPtr intel = INTEL_CONTEXT(ctx);

    if (0)
       fprintf(stderr, "%s %s\n", __FUNCTION__, _mesa_lookup_enum_by_nr(prim));

    /* Let some clipping routines know which primitive they're dealing
     * with.
     */
    intel->render_primitive = prim;

    /* Shortcircuit this when called from t_dd_rendertmp.h for unfilled
     * triangles.  The rasterized primitive will always be reset by
     * lower level functions in that case, potentially pingponging the
     * state:
     */
    if (reduced_prim[prim] == GL_TRIANGLES && 
	(ctx->_TriangleCaps & DD_TRI_UNFILLED))
       return;

    /* Set some primitive-dependent state and Start? a new primitive.
     */
    intelRasterPrimitive( ctx, reduced_prim[prim], hw_prim[prim] );
 }


 /**********************************************************************/
 /*           Transition to/from hardware rasterization.               */
 /**********************************************************************/

 static char *fallbackStrings[] = {
    "Texture",
    "Draw buffer",
    "Read buffer",
    "Color mask",
    "Render mode",
    "Stencil",
    "Stipple",
    "User disable"
 };


 static char *getFallbackString(GLuint bit)
 {
    int i = 0;
    while (bit > 1) {
       i++;
       bit >>= 1;
    }
    return fallbackStrings[i];
 }



 void intelFallback( intelContextPtr intel, GLuint bit, GLboolean mode )
 {
    GLcontext *ctx = &intel->ctx;
    TNLcontext *tnl = TNL_CONTEXT(ctx);
    GLuint oldfallback = intel->Fallback;

    if (mode) {
       intel->Fallback |= bit;
       if (oldfallback == 0) {
	  intelFlush(ctx);
	  if (INTEL_DEBUG & DEBUG_FALLBACKS) 
	     fprintf(stderr, "ENTER FALLBACK %x: %s\n",
		     bit, getFallbackString( bit ));
	  _swsetup_Wakeup( ctx );
	  intel->RenderIndex = ~0;
       }
    }
    else {
       intel->Fallback &= ~bit;
       if (oldfallback == bit) {
	  _swrast_flush( ctx );
	  if (INTEL_DEBUG & DEBUG_FALLBACKS) 
	     fprintf(stderr, "LEAVE FALLBACK %s\n", getFallbackString( bit ));
	  tnl->Driver.Render.Start = intelRenderStart;
	  tnl->Driver.Render.PrimitiveNotify = intelRenderPrimitive;
	  tnl->Driver.Render.Finish = intelRenderFinish;
	  tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
	  tnl->Driver.Render.CopyPV = _tnl_copy_pv;
	  tnl->Driver.Render.Interp = _tnl_interp;

	  _tnl_invalidate_vertex_state( ctx, ~0 );
	  _tnl_invalidate_vertices( ctx, ~0 );
	  _tnl_install_attrs( ctx, 
			      intel->vertex_attrs, 
			      intel->vertex_attr_count,
			      intel->ViewportMatrix.m, 0 ); 

	  intel->NewGLState |= _INTEL_NEW_RENDERSTATE;
       }
    }
 }




/**********************************************************************/
/*                            Initialization.                         */
/**********************************************************************/


void intelInitTriFuncs( GLcontext *ctx )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   static int firsttime = 1;

   if (firsttime) {
      init_rast_tab();
      firsttime = 0;
   }

   tnl->Driver.RunPipeline = intelRunPipeline;
   tnl->Driver.Render.Start = intelRenderStart;
   tnl->Driver.Render.Finish = intelRenderFinish;
   tnl->Driver.Render.PrimitiveNotify = intelRenderPrimitive;
   tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
   tnl->Driver.Render.BuildVertices = _tnl_build_vertices;
   tnl->Driver.Render.CopyPV = _tnl_copy_pv;
   tnl->Driver.Render.Interp = _tnl_interp;
}