src/mesa/pipe/softpipe/sp_quad_alpha_test.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108


/**
 * quad alpha test
 */

#include "sp_context.h"
#include "sp_headers.h"
#include "sp_quad.h"
#include "pipe/p_defines.h"
#include "pipe/p_util.h"


static void
alpha_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
   struct softpipe_context *softpipe = qs->softpipe;
   const float ref = softpipe->alpha_test->ref;
   unsigned passMask = 0x0, j;

   switch (softpipe->alpha_test->func) {
   case PIPE_FUNC_NEVER:
      quad->mask = 0x0;
      break;
   case PIPE_FUNC_LESS:
      /*
       * If mask were an array [4] we could do this SIMD-style:
       * passMask = (quad->outputs.color[3] <= vec4(ref));
       */
      for (j = 0; j < QUAD_SIZE; j++) {
         if (quad->outputs.color[3][j] < ref) {
            passMask |= (1 << j);
         }
      }
      break;
   case PIPE_FUNC_EQUAL:
      for (j = 0; j < QUAD_SIZE; j++) {
         if (quad->outputs.color[3][j] == ref) {
            passMask |= (1 << j);
         }
      }
      break;
   case PIPE_FUNC_LEQUAL:
      for (j = 0; j < QUAD_SIZE; j++) {
         if (quad->outputs.color[3][j] <= ref) {
            passMask |= (1 << j);
         }
      }
      break;
   case PIPE_FUNC_GREATER:
      for (j = 0; j < QUAD_SIZE; j++) {
         if (quad->outputs.color[3][j] > ref) {
            passMask |= (1 << j);
         }
      }
      break;
   case PIPE_FUNC_NOTEQUAL:
      for (j = 0; j < QUAD_SIZE; j++) {
         if (quad->outputs.color[3][j] != ref) {
            passMask |= (1 << j);
         }
      }
      break;
   case PIPE_FUNC_GEQUAL:
      for (j = 0; j < QUAD_SIZE; j++) {
         if (quad->outputs.color[3][j] >= ref) {
            passMask |= (1 << j);
         }
      }
      break;
   case PIPE_FUNC_ALWAYS:
      passMask = MASK_ALL;
      break;
   default:
      abort();
   }

   quad->mask &= passMask;

   if (quad->mask)
      qs->next->run(qs->next, quad);
}


static void alpha_test_begin(struct quad_stage *qs)
{
   if (qs->next)
      qs->next->begin(qs->next);
}


static void alpha_test_destroy(struct quad_stage *qs)
{
   FREE( qs );
}


struct quad_stage *
sp_quad_alpha_test_stage( struct softpipe_context *softpipe )
{
   struct quad_stage *stage = CALLOC_STRUCT(quad_stage);

   stage->softpipe = softpipe;
   stage->begin = alpha_test_begin;
   stage->run = alpha_test_quad;
   stage->destroy = alpha_test_destroy;

   return stage;
}