t_dd_dmatmp2.h

winNT技术操作系统,国外开放的原代码和LIUX一样

static void TAG(render_quads_verts)( GLcontext *ctx,
				     GLuint start,
				     GLuint count,
				     GLuint flags )
{
   LOCAL_VARS;
   if (0) fprintf(stderr, "%s\n", __FUNCTION__);
   count -= (count-start)%4;

   if (start+3 >= count) 
      return;

   if (HAVE_QUADS) {
      EMIT_PRIM( ctx, GL_QUADS, HW_QUADS, start, count );
   } 
   else {
      /* Hardware doesn't have a quad primitive type -- simulate it
       * using indexed vertices and the triangle primitive: 
       */
      LOCAL_VARS;
      int dmasz = GET_MAX_HW_ELTS();
      GLuint j, nr;

      ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );

      /* Adjust for rendering as triangles:
       */
      dmasz = (dmasz/6)*4;

      for (j = start; j < count; j += nr ) {
	 ELT_TYPE *dest;
	 GLint quads, i;

	 nr = MIN2( dmasz, count - j );
	 quads = nr/4;
	 dest = ALLOC_ELTS( quads*6 );

	 for ( i = j ; i < j+quads*4 ; i+=4 ) {
	    EMIT_TWO_ELTS( dest, 0, (i+0), (i+1) );
	    EMIT_TWO_ELTS( dest, 2, (i+3), (i+1) );
	    EMIT_TWO_ELTS( dest, 4, (i+2), (i+3) );
	    dest += 6;
	 }

	 CLOSE_ELTS();
      }
   }
}

static void TAG(render_noop)( GLcontext *ctx,
			      GLuint start,
			      GLuint count,
			      GLuint flags )
{
}




static tnl_render_func TAG(render_tab_verts)[GL_POLYGON+2] =
{
   TAG(render_points_verts),
   TAG(render_lines_verts),
   TAG(render_line_loop_verts),
   TAG(render_line_strip_verts),
   TAG(render_triangles_verts),
   TAG(render_tri_strip_verts),
   TAG(render_tri_fan_verts),
   TAG(render_quads_verts),
   TAG(render_quad_strip_verts),
   TAG(render_poly_verts),
   TAG(render_noop),
};


/****************************************************************************
 *                 Render elts using hardware indexed verts                 *
 ****************************************************************************/

static void TAG(render_points_elts)( GLcontext *ctx,
				     GLuint start,
				     GLuint count,
				     GLuint flags )
{
   LOCAL_VARS;
   int dmasz = GET_MAX_HW_ELTS();
   GLuint *elts = GET_MESA_ELTS();
   GLuint j, nr;
   ELT_TYPE *dest;

   ELT_INIT( GL_POINTS, HW_POINTS );

   for (j = start; j < count; j += nr ) {
      nr = MIN2( dmasz, count - j );
      dest = ALLOC_ELTS( nr );
      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
      CLOSE_ELTS();
   }
}



static void TAG(render_lines_elts)( GLcontext *ctx,
				    GLuint start,
				    GLuint count,
				    GLuint flags )
{
   LOCAL_VARS;
   int dmasz = GET_MAX_HW_ELTS();
   GLuint *elts = GET_MESA_ELTS();
   GLuint j, nr;
   ELT_TYPE *dest;

   if (start+1 >= count)
      return;

   if ((flags & PRIM_BEGIN) && ctx->Line.StippleFlag) {
      RESET_STIPPLE();
      AUTO_STIPPLE( GL_TRUE );
   }

   ELT_INIT( GL_LINES, HW_LINES );

   /* Emit whole number of lines in total and in each buffer:
    */
   count -= (count-start) & 1;
   dmasz -= dmasz & 1;

   for (j = start; j < count; j += nr ) {
      nr = MIN2( dmasz, count - j );
      dest = ALLOC_ELTS( nr );
      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
      CLOSE_ELTS();
   }

   if ((flags & PRIM_END) && ctx->Line.StippleFlag)
      AUTO_STIPPLE( GL_FALSE );
}


static void TAG(render_line_strip_elts)( GLcontext *ctx,
					 GLuint start,
					 GLuint count,
					 GLuint flags )
{
   LOCAL_VARS;
   int dmasz = GET_MAX_HW_ELTS();
   GLuint *elts = GET_MESA_ELTS();
   GLuint j, nr;
   ELT_TYPE *dest;

   if (start+1 >= count)
      return;

   ELT_INIT( GL_LINE_STRIP, HW_LINE_STRIP );

   if ((flags & PRIM_BEGIN) && ctx->Line.StippleFlag)
      RESET_STIPPLE();

   for (j = start; j + 1 < count; j += nr - 1 ) {
      nr = MIN2( dmasz, count - j );
      dest = ALLOC_ELTS( nr );
      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
      CLOSE_ELTS();
   }
}


static void TAG(render_line_loop_elts)( GLcontext *ctx,
					GLuint start,
					GLuint count,
					GLuint flags )
{
   LOCAL_VARS;
   int dmasz = GET_MAX_HW_ELTS();
   GLuint *elts = GET_MESA_ELTS();
   GLuint j, nr;
   ELT_TYPE *dest;

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

   if (flags & PRIM_BEGIN)
      j = start;
   else
      j = start + 1;

   
   if (flags & PRIM_END) {
      if (start+1 >= count)
	 return;
   } 
   else {
      if (j+1 >= count)
	 return;
   }

   ELT_INIT( GL_LINE_STRIP, HW_LINE_STRIP );

   if ((flags & PRIM_BEGIN) && ctx->Line.StippleFlag)
      RESET_STIPPLE();

   
   /* Ensure last vertex doesn't wrap:
    */
   dmasz--;

   for ( ; j + 1 < count; ) {
      nr = MIN2( dmasz, count - j );
      dest = ALLOC_ELTS( nr+1 );	/* Reserve possible space for last elt */
      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
      j += nr - 1;
      if (j + 1 >= count && (flags & PRIM_END)) {
	 dest = TAG(emit_elts)( ctx, dest, elts+start, 1 );
      }
      CLOSE_ELTS();
   }
}


static void TAG(render_triangles_elts)( GLcontext *ctx,
					GLuint start,
					GLuint count,
					GLuint flags )
{
   LOCAL_VARS;
   GLuint *elts = GET_MESA_ELTS();
   int dmasz = GET_MAX_HW_ELTS()/3*3;
   GLuint j, nr;
   ELT_TYPE *dest;

   if (start+2 >= count)
      return;

   ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );


   /* Emit whole number of tris in total.  dmasz is already a multiple
    * of 3.
    */
   count -= (count-start)%3;

   for (j = start; j < count; j += nr) {
      nr = MIN2( dmasz, count - j );
      dest = ALLOC_ELTS( nr );
      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
      CLOSE_ELTS();
   }
}



static void TAG(render_tri_strip_elts)( GLcontext *ctx,
					GLuint start,
					GLuint count,
					GLuint flags )
{
   LOCAL_VARS;
   GLuint j, nr;
   GLuint *elts = GET_MESA_ELTS();
   int dmasz = GET_MAX_HW_ELTS();
   ELT_TYPE *dest;

   if (start+2 >= count)
      return;

   ELT_INIT( GL_TRIANGLE_STRIP, HW_TRIANGLE_STRIP_0 );

   /* Keep the same winding over multiple buffers:
    */
   dmasz -= (dmasz & 1);

   for (j = start ; j + 2 < count; j += nr - 2 ) {
      nr = MIN2( dmasz, count - j );

      dest = ALLOC_ELTS( nr );
      dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
      CLOSE_ELTS();
   }
}

static void TAG(render_tri_fan_elts)( GLcontext *ctx,
				      GLuint start,
				      GLuint count,
				      GLuint flags )
{
   LOCAL_VARS;
   GLuint *elts = GET_MESA_ELTS();
   GLuint j, nr;
   int dmasz = GET_MAX_HW_ELTS();
   ELT_TYPE *dest;

   if (start+2 >= count)
      return;

   ELT_INIT( GL_TRIANGLE_FAN, HW_TRIANGLE_FAN );

   for (j = start + 1 ; j + 1 < count; j += nr - 1 ) {
      nr = MIN2( dmasz, count - j + 1 );
      dest = ALLOC_ELTS( nr );
      dest = TAG(emit_elts)( ctx, dest, elts+start, 1 );
      dest = TAG(emit_elts)( ctx, dest, elts+j, nr - 1 );
      CLOSE_ELTS();
   }
}


static void TAG(render_poly_elts)( GLcontext *ctx,
				   GLuint start,
				   GLuint count,
				   GLuint flags )
{
   LOCAL_VARS;
   GLuint *elts = GET_MESA_ELTS();
   GLuint j, nr;
   int dmasz = GET_MAX_HW_ELTS();
   ELT_TYPE *dest;

   if (start+2 >= count)
      return;

   ELT_INIT( GL_POLYGON, HW_POLYGON );

   for (j = start + 1 ; j + 1 < count ; j += nr - 1 ) {
      nr = MIN2( dmasz, count - j + 1 );
      dest = ALLOC_ELTS( nr );
      dest = TAG(emit_elts)( ctx, dest, elts+start, 1 );
      dest = TAG(emit_elts)( ctx, dest, elts+j, nr - 1 );
      CLOSE_ELTS();
   }
}

static void TAG(render_quad_strip_elts)( GLcontext *ctx,
					 GLuint start,
					 GLuint count,
					 GLuint flags )
{
   if (start+3 >= count)
      return;

   if (HAVE_QUAD_STRIPS && 0) {
   }
   else {
      LOCAL_VARS;
      GLuint *elts = GET_MESA_ELTS();
      int dmasz = GET_MAX_HW_ELTS();
      GLuint j, nr;
      ELT_TYPE *dest;

      /* Emit whole number of quads in total, and in each buffer.
       */
      dmasz -= dmasz & 1;
      count -= (count-start) & 1;

      if (ctx->_TriangleCaps & DD_FLATSHADE) {
	 ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );

	 dmasz = dmasz/6*2;

	 for (j = start; j + 3 < count; j += nr - 2 ) {
	    nr = MIN2( dmasz, count - j );

	    if (nr >= 4)
	    {
	       GLint quads = (nr/2)-1;
	       ELT_TYPE *dest = ALLOC_ELTS( quads*6 );
	       GLint i;

	       for ( i = j-start ; i < j-start+quads ; i++, elts += 2 ) {
		  EMIT_TWO_ELTS( dest, 0, elts[0], elts[1] );
		  EMIT_TWO_ELTS( dest, 2, elts[2], elts[1] );
		  EMIT_TWO_ELTS( dest, 4, elts[3], elts[2] );
		  dest += 6;
	       }

	       CLOSE_ELTS();
	    }
	 }
      }
      else {
	 ELT_INIT( GL_TRIANGLE_STRIP, HW_TRIANGLE_STRIP_0 );

	 for (j = start; j + 3 < count; j += nr - 2 ) {
	    nr = MIN2( dmasz, count - j );
	    dest = ALLOC_ELTS( nr );
	    dest = TAG(emit_elts)( ctx, dest, elts+j, nr );
	    CLOSE_ELTS();
	 }
      }
   }
}


static void TAG(render_quads_elts)( GLcontext *ctx,
				    GLuint start,
				    GLuint count,
				    GLuint flags )
{
   if (start+3 >= count)
      return;

   if (HAVE_QUADS && 0) {
   } else {
      LOCAL_VARS;
      GLuint *elts = GET_MESA_ELTS();
      int dmasz = GET_MAX_HW_ELTS();
      GLuint j, nr;

      ELT_INIT( GL_TRIANGLES, HW_TRIANGLES );

      /* Emit whole number of quads in total, and in each buffer.
       */
      dmasz -= dmasz & 3;
      count -= (count-start) & 3;

      /* Adjust for rendering as triangles:
       */
      dmasz = dmasz/6*4;

      for (j = start; j + 3 < count; j += nr ) {
	 nr = MIN2( dmasz, count - j );

	 {
	    GLint quads = nr/4;
	    ELT_TYPE *dest = ALLOC_ELTS( quads * 6 );
	    GLint i;

	    for ( i = j-start ; i < j-start+quads ; i++, elts += 4 ) {
	       EMIT_TWO_ELTS( dest, 0, elts[0], elts[1] );
	       EMIT_TWO_ELTS( dest, 2, elts[3], elts[1] );
	       EMIT_TWO_ELTS( dest, 4, elts[2], elts[3] );
	       dest += 6;
	    }

	    CLOSE_ELTS();
	 }
      }
   }
}



static tnl_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),
};