layer = MIN2(layer, scene->fb_max_layer);
}
- if (setup->scissor_test) {
- nr_planes = 8;
- }
- else {
- nr_planes = 4;
- }
-
dx = v1[0][0] - v2[0][0];
dy = v1[0][1] - v2[0][1];
area = (dx * dx + dy * dy);
bbox.x0 = MAX2(bbox.x0, 0);
bbox.y0 = MAX2(bbox.y0, 0);
+ nr_planes = 4;
+ /*
+ * Determine how many scissor planes we need, that is drop scissor
+ * edges if the bounding box of the tri is fully inside that edge.
+ */
+ if (setup->scissor_test) {
+ /* why not just use draw_regions */
+ boolean s_planes[4];
+ scissor_planes_needed(s_planes, &bbox, &setup->scissors[viewport_index]);
+ nr_planes += s_planes[0] + s_planes[1] + s_planes[2] + s_planes[3];
+ }
+
line = lp_setup_alloc_triangle(scene,
key->num_inputs,
nr_planes,
* Note that otherwise, the scissor planes only vary in 'C' value,
* and even then only on state-changes. Could alternatively store
* these planes elsewhere.
+ * (Or only store the c value together with a bit indicating which
+ * scissor edge this is, so rasterization would treat them differently
+ * (easier to evaluate) to ordinary planes.)
*/
- if (nr_planes == 8) {
- const struct u_rect *scissor =
- &setup->scissors[viewport_index];
-
- plane[4].dcdx = -1 << 8;
- plane[4].dcdy = 0;
- plane[4].c = (1-scissor->x0) << 8;
- plane[4].eo = 1 << 8;
-
- plane[5].dcdx = 1 << 8;
- plane[5].dcdy = 0;
- plane[5].c = (scissor->x1+1) << 8;
- plane[5].eo = 0;
-
- plane[6].dcdx = 0;
- plane[6].dcdy = 1 << 8;
- plane[6].c = (1-scissor->y0) << 8;
- plane[6].eo = 1 << 8;
-
- plane[7].dcdx = 0;
- plane[7].dcdy = -1 << 8;
- plane[7].c = (scissor->y1+1) << 8;
- plane[7].eo = 0;
+ if (nr_planes > 4) {
+ /* why not just use draw_regions */
+ const struct u_rect *scissor = &setup->scissors[viewport_index];
+ struct lp_rast_plane *plane_s = &plane[4];
+ boolean s_planes[4];
+ scissor_planes_needed(s_planes, &bbox, scissor);
+
+ if (s_planes[0]) {
+ plane_s->dcdx = -1 << 8;
+ plane_s->dcdy = 0;
+ plane_s->c = (1-scissor->x0) << 8;
+ plane_s->eo = 1 << 8;
+ plane_s++;
+ }
+ if (s_planes[1]) {
+ plane_s->dcdx = 1 << 8;
+ plane_s->dcdy = 0;
+ plane_s->c = (scissor->x1+1) << 8;
+ plane_s->eo = 0 << 8;
+ plane_s++;
+ }
+ if (s_planes[2]) {
+ plane_s->dcdx = 0;
+ plane_s->dcdy = 1 << 8;
+ plane_s->c = (1-scissor->y0) << 8;
+ plane_s->eo = 1 << 8;
+ plane_s++;
+ }
+ if (s_planes[3]) {
+ plane_s->dcdx = 0;
+ plane_s->dcdy = -1 << 8;
+ plane_s->c = (scissor->y1+1) << 8;
+ plane_s->eo = 0;
+ plane_s++;
+ }
+ assert(plane_s == &plane[nr_planes]);
}
return lp_setup_bin_triangle(setup, line, &bbox, nr_planes, viewport_index);