3 * quad polygon stipple stage
6 #include "sp_context.h"
8 #include "sp_quad_pipe.h"
9 #include "pipe/p_defines.h"
10 #include "util/u_memory.h"
14 * Apply polygon stipple to quads produced by triangle rasterization
17 stipple_quad(struct quad_stage *qs, struct quad_header *quads[], unsigned nr)
19 static const uint bit31 = 1 << 31;
20 static const uint bit30 = 1 << 30;
23 struct softpipe_context *softpipe = qs->softpipe;
28 for (q = 0; q < nr; q++) {
29 struct quad_header *quad = quads[q];
31 const int col0 = quad->input.x0 % 32;
32 const int y0 = quad->input.y0;
33 const int y1 = y0 + 1;
34 const uint stipple0 = softpipe->poly_stipple.stipple[y0 % 32];
35 const uint stipple1 = softpipe->poly_stipple.stipple[y1 % 32];
37 /* turn off quad mask bits that fail the stipple test */
38 if ((stipple0 & (bit31 >> col0)) == 0)
39 quad->inout.mask &= ~MASK_TOP_LEFT;
41 if ((stipple0 & (bit30 >> col0)) == 0)
42 quad->inout.mask &= ~MASK_TOP_RIGHT;
44 if ((stipple1 & (bit31 >> col0)) == 0)
45 quad->inout.mask &= ~MASK_BOTTOM_LEFT;
47 if ((stipple1 & (bit30 >> col0)) == 0)
48 quad->inout.mask &= ~MASK_BOTTOM_RIGHT;
54 qs->next->run(qs->next, quads, pass);
58 static void stipple_begin(struct quad_stage *qs)
60 qs->next->begin(qs->next);
64 static void stipple_destroy(struct quad_stage *qs)
71 sp_quad_polygon_stipple_stage( struct softpipe_context *softpipe )
73 struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
75 stage->softpipe = softpipe;
76 stage->begin = stipple_begin;
77 stage->run = stipple_quad;
78 stage->destroy = stipple_destroy;