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/**************************************************************************
*
* Copyright 2007-2009 VMware, Inc.
* 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 VMWARE 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.
*
**************************************************************************/
/*
* Rasterization for binned triangles within a tile
*/
#include "util/u_math.h"
#include "lp_rast_priv.h"
#include "lp_tile_soa.h"
#define BLOCKSIZE 4
/* Render a 4x4 unmasked block:
*/
static void block_full_4( struct lp_rasterizer *rast,
const struct lp_rast_triangle *tri,
int x, int y )
{
unsigned mask = ~0;
lp_rast_shade_quads(rast, &tri->inputs, x, y, mask);
}
static void block_full_16( struct lp_rasterizer *rast,
const struct lp_rast_triangle *tri,
int x, int y )
{
unsigned mask = ~0;
unsigned ix, iy;
for (iy = 0; iy < 16; iy+=4)
for (ix = 0; ix < 16; ix+=4)
lp_rast_shade_quads(rast, &tri->inputs, x + ix, y + iy , mask);
}
/* Evaluate each pixel in a block, generate a mask and possibly render
* the quad:
*/
static void
do_block_4( struct lp_rasterizer *rast,
const struct lp_rast_triangle *tri,
int x, int y,
int c1,
int c2,
int c3 )
{
int i;
unsigned mask = 0;
for (i = 0; i < 16; i++)
mask |= (~(((c1 + tri->step[0][i]) |
(c2 + tri->step[1][i]) |
(c3 + tri->step[2][i])) >> 31)) & (1 << i);
/* As we do trivial reject already, masks should rarely be all
* zero:
*/
if (mask)
lp_rast_shade_quads(rast, &tri->inputs, x, y, mask );
}
static void
do_block_16( struct lp_rasterizer *rast,
const struct lp_rast_triangle *tri,
int x, int y,
int c1,
int c2,
int c3 )
{
int ix,iy,i = 0;
int ei1 = tri->ei1 << 2;
int ei2 = tri->ei2 << 2;
int ei3 = tri->ei3 << 2;
int eo1 = tri->eo1 << 2;
int eo2 = tri->eo2 << 2;
int eo3 = tri->eo3 << 2;
for (iy = 0; iy < 16; iy+=4)
{
for (ix = 0; ix < 16; ix+=4, i++)
{
int cx1 = c1 + (tri->step[0][i] << 2);
int cx2 = c2 + (tri->step[1][i] << 2);
int cx3 = c3 + (tri->step[2][i] << 2);
if (cx1 + eo1 < 0 ||
cx2 + eo2 < 0 ||
cx3 + eo3 < 0)
{
}
else if (cx1 + ei1 > 0 &&
cx2 + ei2 > 0 &&
cx3 + ei3 > 0)
{
block_full_4(rast, tri, x+ix, y+iy); /* trivial accept */
}
else
{
do_block_4(rast, tri, x+ix, y+iy, cx1, cx2, cx3);
}
}
}
}
/* Scan the tile in chunks and figure out which pixels to rasterize
* for this triangle:
*/
void lp_rast_triangle( struct lp_rasterizer *rast,
const union lp_rast_cmd_arg arg )
{
const struct lp_rast_triangle *tri = arg.triangle;
int x = rast->x;
int y = rast->y;
int ix,iy,i = 0;
int c1 = tri->c1 + tri->dx12 * y - tri->dy12 * x;
int c2 = tri->c2 + tri->dx23 * y - tri->dy23 * x;
int c3 = tri->c3 + tri->dx31 * y - tri->dy31 * x;
int ei1 = tri->ei1 << 4;
int ei2 = tri->ei2 << 4;
int ei3 = tri->ei3 << 4;
int eo1 = tri->eo1 << 4;
int eo2 = tri->eo2 << 4;
int eo3 = tri->eo3 << 4;
debug_printf("%s\n", __FUNCTION__);
for (iy = 0; iy < 64; iy+=16)
{
for (ix = 0; ix < 64; ix+=16, i++)
{
int cx1 = c1 + (tri->step[0][i] << 4);
int cx2 = c2 + (tri->step[1][i] << 4);
int cx3 = c3 + (tri->step[2][i] << 4);
if (cx1 + eo1 < 0 ||
cx2 + eo2 < 0 ||
cx3 + eo3 < 0)
{
}
else if (cx1 + ei1 > 0 &&
cx2 + ei2 > 0 &&
cx3 + ei3 > 0)
{
block_full_16(rast, tri, x+ix, y+iy); /* trivial accept */
}
else
{
do_block_16(rast, tri, x+ix, y+iy, cx1, cx2, cx3);
}
}
}
}
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