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/**
* quad polygon stipple stage
*/
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_quad.h"
#include "pipe/p_defines.h"
#include "pipe/p_util.h"
/**
* Apply polygon stipple to quads produced by triangle rasterization
*/
static void
stipple_quad(struct quad_stage *qs, struct quad_header *quad)
{
if (quad->prim == PRIM_TRI) {
struct softpipe_context *softpipe = qs->softpipe;
const int col0 = quad->x0 % 32;
const int row0 = quad->y0 % 32;
const unsigned stipple0 = softpipe->poly_stipple.stipple[row0];
const unsigned stipple1 = softpipe->poly_stipple.stipple[row0 + 1];
/* XXX there may be a better way to lay out the stored stipple
* values to further simplify this computation.
*/
quad->mask &= (((stipple0 >> col0) & 0x3) |
(((stipple1 >> col0) & 0x3) << 2));
if (quad->mask)
qs->next->run(qs->next, quad);
}
}
static void stipple_begin(struct quad_stage *qs)
{
if (qs->next)
qs->next->begin(qs->next);
}
struct quad_stage *
sp_quad_polygon_stipple_stage( struct softpipe_context *softpipe )
{
struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
stage->softpipe = softpipe;
stage->begin = stipple_begin;
stage->run = stipple_quad;
return stage;
}
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