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fan triangulation
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IoI_xD 2026-04-08 17:06:29 -07:00
commit c8e4d44e3e
1 changed files with 8 additions and 14 deletions
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20
src/backend/wayland.c
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@ -2045,23 +2045,17 @@ static void MwLLPolygonImpl(MwLL handle, MwPoint* points, int points_count, MwLL
pixman_color_t col = {color->common.blue * 0xFF, color->common.green * 0xFF, color->common.red * 0xFF, 0xffff};
pixman_triangle_t* triangles = malloc(sizeof(pixman_triangle_t) * points_count);
pixman_image_t* image = pixman_image_create_solid_fill(&col);
memset(triangles, 0, sizeof(pixman_triangle_t) * points_count);
// todo: somebody smarter then me can do a real triangulation algorithim
for(i = 0; i < points_count; i++) {
triangles[i].p1.x = pixman_int_to_fixed(points[i].x);
triangles[i].p1.y = pixman_int_to_fixed(points[i].y);
if(i + 1 < points_count) {
triangles[i].p2.x = pixman_int_to_fixed(points[i + 1].x);
triangles[i].p2.y = pixman_int_to_fixed(points[i + 1].y);
}
if(i + 2 < points_count) {
triangles[i].p3.x = pixman_int_to_fixed(points[i + 2].x);
triangles[i].p3.y = pixman_int_to_fixed(points[i + 2].y);
}
for(int i = 1; i < points_count - 1; i++) {
triangles[i - 1] = (pixman_triangle_t){
.p1 = {pixman_int_to_fixed(points[0].x), pixman_int_to_fixed(points[0].y)},
.p2 = {pixman_int_to_fixed(points[i].x), pixman_int_to_fixed(points[i].y)},
.p3 = {pixman_int_to_fixed(points[i + 1].x), pixman_int_to_fixed(points[i + 1].y)},
};
}
pixman_composite_triangles(PIXMAN_OP_ATOP_REVERSE, image, handle->wayland.framebuffer.pixman_fb, PIXMAN_a8, 0, 0, 0, 0, points_count, triangles);
free(triangles);
pixman_image_unref(image);
handle->wayland.events_pending = 1;