1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
10 struct RectWithEndpoint {
15 float point_inside_rect(vec2 p, vec2 p0, vec2 p1) {
16 vec2 s = step(p0, p) - step(p1, p);
20 vec2 signed_distance_rect_xy(vec2 pos, vec2 p0, vec2 p1) {
21 // Instead of using a true signed distance to rect here, we just use the
22 // simpler approximation of the maximum distance on either axis from the
23 // outside of the rectangle. This avoids expensive use of length() and only
24 // causes mostly imperceptible differences at corner pixels.
25 return max(p0 - pos, pos - p1);
28 float signed_distance_rect(vec2 pos, vec2 p0, vec2 p1) {
29 // Collapse the per-axis distances to edges to a single approximate value.
30 vec2 d = signed_distance_rect_xy(pos, p0, p1);
34 vec2 rect_clamp(RectWithEndpoint rect, vec2 pt) {
35 return clamp(pt, rect.p0, rect.p1);
38 vec2 rect_size(RectWithEndpoint rect) {
39 return rect.p1 - rect.p0;