diff options
Diffstat (limited to 'src/mesa/pipe/softpipe/sp_quad_stipple.c')
-rw-r--r-- | src/mesa/pipe/softpipe/sp_quad_stipple.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/mesa/pipe/softpipe/sp_quad_stipple.c b/src/mesa/pipe/softpipe/sp_quad_stipple.c new file mode 100644 index 0000000000..f9a3c0ba26 --- /dev/null +++ b/src/mesa/pipe/softpipe/sp_quad_stipple.c @@ -0,0 +1,56 @@ + +/** + * quad polygon stipple stage + */ + +#include "glheader.h" +#include "imports.h" +#include "sp_context.h" +#include "sp_headers.h" +#include "sp_quad.h" +#include "pipe/p_defines.h" + + +/** + * Apply polygon stipple to quads produced by triangle rasterization + */ +static void +stipple_quad(struct quad_stage *qs, struct quad_header *quad) +{ + struct softpipe_context *softpipe = qs->softpipe; + const GLint col0 = quad->x0 % 32; + const GLint row0 = quad->y0 % 32; + const GLuint stipple0 = softpipe->poly_stipple.stipple[row0]; + const GLuint stipple1 = softpipe->poly_stipple.stipple[row0 + 1]; + GLbitfield mask = 0x0; + + /* XXX this could be optimize a bit to use just two conditionals */ + if ((1 << col0) & stipple0) + mask |= MASK_BOTTOM_LEFT; + + if ((2 << col0) & stipple0) + mask |= MASK_BOTTOM_RIGHT; + + if ((1 << col0) & stipple1) + mask |= MASK_TOP_LEFT; + + if ((2 << col0) & stipple1) + mask |= MASK_TOP_RIGHT; + + quad->mask &= mask; + + if (quad->mask) + qs->next->run(qs->next, quad); +} + + +struct quad_stage * +sp_quad_polygon_stipple_stage( struct softpipe_context *softpipe ) +{ + struct quad_stage *stage = CALLOC_STRUCT(quad_stage); + + stage->softpipe = softpipe; + stage->run = stipple_quad; + + return stage; +} |