| |
| /** |
| * quad polygon stipple stage |
| */ |
| |
| #include "sp_context.h" |
| #include "sp_quad.h" |
| #include "sp_quad_pipe.h" |
| #include "pipe/p_defines.h" |
| #include "util/u_memory.h" |
| |
| |
| /** |
| * Apply polygon stipple to quads produced by triangle rasterization |
| */ |
| static void |
| stipple_quad(struct quad_stage *qs, struct quad_header *quads[], unsigned nr) |
| { |
| static const uint bit31 = 1 << 31; |
| static const uint bit30 = 1 << 30; |
| unsigned pass = nr; |
| |
| struct softpipe_context *softpipe = qs->softpipe; |
| unsigned q; |
| |
| pass = 0; |
| |
| for (q = 0; q < nr; q++) { |
| struct quad_header *quad = quads[q]; |
| |
| const int col0 = quad->input.x0 % 32; |
| const int y0 = quad->input.y0; |
| const int y1 = y0 + 1; |
| const uint stipple0 = softpipe->poly_stipple.stipple[y0 % 32]; |
| const uint stipple1 = softpipe->poly_stipple.stipple[y1 % 32]; |
| |
| /* turn off quad mask bits that fail the stipple test */ |
| if ((stipple0 & (bit31 >> col0)) == 0) |
| quad->inout.mask &= ~MASK_TOP_LEFT; |
| |
| if ((stipple0 & (bit30 >> col0)) == 0) |
| quad->inout.mask &= ~MASK_TOP_RIGHT; |
| |
| if ((stipple1 & (bit31 >> col0)) == 0) |
| quad->inout.mask &= ~MASK_BOTTOM_LEFT; |
| |
| if ((stipple1 & (bit30 >> col0)) == 0) |
| quad->inout.mask &= ~MASK_BOTTOM_RIGHT; |
| |
| if (quad->inout.mask) |
| quads[pass++] = quad; |
| } |
| |
| qs->next->run(qs->next, quads, pass); |
| } |
| |
| |
| static void stipple_begin(struct quad_stage *qs) |
| { |
| qs->next->begin(qs->next); |
| } |
| |
| |
| static void stipple_destroy(struct quad_stage *qs) |
| { |
| FREE( qs ); |
| } |
| |
| |
| 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; |
| stage->destroy = stipple_destroy; |
| |
| return stage; |
| } |