summaryrefslogtreecommitdiff
path: root/src/gallium/auxiliary/draw/draw_pt_varray_tmp.h
blob: b9a319b2535bacb7748cd518311a27387156fdeb (plain)
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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144

static void FUNC(struct draw_pt_front_end *frontend,
                 pt_elt_func get_elt,
                 const void *elts,
                 unsigned count)
{
   struct varray_frontend *varray = (struct varray_frontend *)frontend;
   struct draw_context *draw = varray->draw;
   unsigned start = (unsigned)elts;

   boolean flatfirst = (draw->rasterizer->flatshade &&
                        draw->rasterizer->flatshade_first);
   unsigned i, flags;

#if 0
   debug_printf("%s (%d) %d/%d\n", __FUNCTION__, draw->prim, start, count);
#endif
#if 0
   debug_printf("INPUT PRIM = %d (start = %d, count = %d)\n", varray->input_prim,
                start, count);
#endif

   for (i = 0; i < count; ++i) {
      varray->fetch_elts[i] = start + i;
   }
   varray->fetch_count = count;

   switch (varray->input_prim) {
   case PIPE_PRIM_POINTS:
      for (i = 0; i < count; i ++) {
         POINT(varray, i + 0);
      }
      break;

   case PIPE_PRIM_LINES:
      for (i = 0; i+1 < count; i += 2) {
         LINE(varray, DRAW_PIPE_RESET_STIPPLE,
              i + 0, i + 1);
      }
      break;

   case PIPE_PRIM_LINE_LOOP:
      if (count >= 2) {
         flags = DRAW_PIPE_RESET_STIPPLE;

         for (i = 1; i < count; i++, flags = 0) {
            LINE(varray, flags, i - 1, i);
         }
         LINE(varray, flags, i - 1, 0);
      }
      break;

   case PIPE_PRIM_LINE_STRIP:
      flags = DRAW_PIPE_RESET_STIPPLE;
      for (i = 1; i < count; i++, flags = 0) {
         LINE(varray, flags, i - 1, i);
      }
      break;

   case PIPE_PRIM_TRIANGLES:
      for (i = 0; i+2 < count; i += 3) {
         TRIANGLE(varray, DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
                  i + 0, i + 1, i + 2);
      }
      break;

   case PIPE_PRIM_TRIANGLE_STRIP:
      if (flatfirst) {
         for (i = 0; i+2 < count; i++) {
            TRIANGLE(varray, DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
                     i + 0, i + 1 + (i&1), i + 2 - (i&1));
         }
      }
      else {
         for (i = 0; i+2 < count; i++) {
            TRIANGLE(varray, DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL,
                     i + 0 + (i&1), i + 1 - (i&1), i + 2);
         }
      }
      break;

   case PIPE_PRIM_TRIANGLE_FAN:
      if (count >= 3) {
         if (flatfirst) {
            flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
            for (i = 0; i+2 < count; i++) {
               TRIANGLE(varray, flags, i + 1, i + 2, 0);
            }
         }
         else {
            flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
            for (i = 0; i+2 < count; i++) {
               TRIANGLE(varray, flags, 0, i + 1, i + 2);
            }
         }
      }
      break;

   case PIPE_PRIM_QUADS:
      for (i = 0; i+3 < count; i += 4) {
         QUAD(varray, i + 0, i + 1, i + 2, i + 3);
      }
      break;

   case PIPE_PRIM_QUAD_STRIP:
      for (i = 0; i+3 < count; i += 2) {
         QUAD(varray, i + 2, i + 0, i + 1, i + 3);
      }
      break;

   case PIPE_PRIM_POLYGON:
   {
         /* These bitflags look a little odd because we submit the
          * vertices as (1,2,0) to satisfy flatshade requirements.
          */
         const unsigned edge_first  = DRAW_PIPE_EDGE_FLAG_2;
         const unsigned edge_middle = DRAW_PIPE_EDGE_FLAG_0;
         const unsigned edge_last   = DRAW_PIPE_EDGE_FLAG_1;

         flags = DRAW_PIPE_RESET_STIPPLE | edge_first | edge_middle;

	 for (i = 0; i+2 < count; i++, flags = edge_middle) {

            if (i + 3 == count)
               flags |= edge_last;

	    TRIANGLE(varray, flags, i + 1, i + 2, 0);
	 }
      }
      break;

   default:
      assert(0);
      break;
   }

   varray_flush(varray);
}

#undef TRIANGLE
#undef QUAD
#undef POINT
#undef LINE
#undef FUNC