src/gallium/drivers/llvmpipe/lp_rast_tri.c

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   3  * Copyright 2007-2009 VMware, Inc.
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  16  * of the Software.
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  27
  28 /*
  29  * Rasterization for binned triangles within a tile
  30  */
  31
  32 #include <limits.h>
  33 #include "util/u_math.h"
  34 #include "lp_debug.h"
  35 #include "lp_perf.h"
  36 #include "lp_rast_priv.h"
  37 #include "lp_tile_soa.h"
  38
  39
  40 /**
  41  * Map an index in [0,15] to an x,y position, multiplied by 4.
  42  * This is used to get the position of each subtile in a 4x4
  43  * grid of edge step values.
  44  * Note: we can use some bit twiddling to compute these values instead
  45  * of using a look-up table, but there's no measurable performance
  46  * difference.
  47  */
  48 static const int pos_table4[16][2] = {
  49    { 0, 0 },
  50    { 4, 0 },
  51    { 0, 4 },
  52    { 4, 4 },
  53    { 8, 0 },
  54    { 12, 0 },
  55    { 8, 4 },
  56    { 12, 4 },
  57    { 0, 8 },
  58    { 4, 8 },
  59    { 0, 12 },
  60    { 4, 12 },
  61    { 8, 8 },
  62    { 12, 8 },
  63    { 8, 12 },
  64    { 12, 12 }
  65 };
  66
  67
  68 static const int pos_table16[16][2] = {
  69    { 0, 0 },
  70    { 16, 0 },
  71    { 0, 16 },
  72    { 16, 16 },
  73    { 32, 0 },
  74    { 48, 0 },
  75    { 32, 16 },
  76    { 48, 16 },
  77    { 0, 32 },
  78    { 16, 32 },
  79    { 0, 48 },
  80    { 16, 48 },
  81    { 32, 32 },
  82    { 48, 32 },
  83    { 32, 48 },
  84    { 48, 48 }
  85 };
  86
  87
  88 /**
  89  * Shade all pixels in a 4x4 block.
  90  */
  91 static void
  92 block_full_4(struct lp_rasterizer_task *task,
  93              const struct lp_rast_triangle *tri,
  94              int x, int y)
  95 {
  96    lp_rast_shade_quads_all(task, &tri->inputs, x, y);
  97 }
  98
  99
 100 /**
 101  * Shade all pixels in a 16x16 block.
 102  */
 103 static void
 104 block_full_16(struct lp_rasterizer_task *task,
 105               const struct lp_rast_triangle *tri,
 106               int x, int y)
 107 {
 108    unsigned ix, iy;
 109    assert(x % 16 == 0);
 110    assert(y % 16 == 0);
 111    for (iy = 0; iy < 16; iy += 4)
 112       for (ix = 0; ix < 16; ix += 4)
 113          block_full_4(task, tri, x + ix, y + iy);
 114 }
 115
 116
 117 static INLINE unsigned
 118 build_mask(int c, const int *step)
 119 {
 120    int mask = 0;
 121    int i;
 122
 123    for (i = 0; i < 16; i++) {
 124       mask |= ((c + step[i]) >> 31) & (1 << i);
 125    }
 126
 127    return mask;
 128 }
 129
 130
 131 #define TAG(x) x##_1
 132 #define NR_PLANES 1
 133 #include "lp_rast_tri_tmp.h"
 134
 135 #define TAG(x) x##_2
 136 #define NR_PLANES 2
 137 #include "lp_rast_tri_tmp.h"
 138
 139 #define TAG(x) x##_3
 140 #define NR_PLANES 3
 141 #include "lp_rast_tri_tmp.h"
 142
 143 #define TAG(x) x##_4
 144 #define NR_PLANES 4
 145 #include "lp_rast_tri_tmp.h"
 146
 147 #define TAG(x) x##_5
 148 #define NR_PLANES 5
 149 #include "lp_rast_tri_tmp.h"
 150
 151 #define TAG(x) x##_6
 152 #define NR_PLANES 6
 153 #include "lp_rast_tri_tmp.h"
 154
 155 #define TAG(x) x##_7
 156 #define NR_PLANES 7
 157 #include "lp_rast_tri_tmp.h"
 158