feat: add wallpaper transitions, store crop in database per-wallpaper, move CUDA context creation to async thread

Plugins/ZShell/Internal/shaders/wallpaper_trans_bowtie.frag

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+// Bow-tie wipe transition adapted from gl-transitions.com
+// Author: huynx (MIT)
+// Original: two triangles grow from the top and bottom edges into a bow tie
+// that reveals the incoming image.
+
+uniform sampler2D from;
+uniform sampler2D to;
+uniform vec2 size;
+uniform vec4 fromCrop;
+uniform vec4 toCrop;
+uniform float progress;
+uniform float fromFlip;
+uniform float toFlip;
+
+out vec4 outColor;
+
+vec4 getFromColor(vec2 uv) {
+	vec2 s = vec2(uv.x, fromFlip > 0.5 ? 1.0 - uv.y : uv.y);
+	return texture(from, fromCrop.xy + s * fromCrop.zw);
+}
+
+vec4 getToColor(vec2 uv) {
+	vec2 s = vec2(uv.x, toFlip > 0.5 ? 1.0 - uv.y : uv.y);
+	return texture(to, toCrop.xy + s * toCrop.zw);
+}
+
+float check(vec2 p1, vec2 p2, vec2 p3) {
+	return (p1.x - p3.x) * (p2.y - p3.y) - (p2.x - p3.x) * (p1.y - p3.y);
+}
+
+bool pointInTriangle(vec2 pt, vec2 p1, vec2 p2, vec2 p3) {
+	bool b1 = check(pt, p1, p2) < 0.0;
+	bool b2 = check(pt, p2, p3) < 0.0;
+	bool b3 = check(pt, p3, p1) < 0.0;
+	return (b1 == b2) && (b2 == b3);
+}
+
+bool in_top_triangle(vec2 p) {
+	vec2 vertex1 = vec2(0.5, progress);
+	vec2 vertex2 = vec2(0.5 - progress, 0.0);
+	vec2 vertex3 = vec2(0.5 + progress, 0.0);
+	return pointInTriangle(p, vertex1, vertex2, vertex3);
+}
+
+bool in_bottom_triangle(vec2 p) {
+	vec2 vertex1 = vec2(0.5, 1.0 - progress);
+	vec2 vertex2 = vec2(0.5 - progress, 1.0);
+	vec2 vertex3 = vec2(0.5 + progress, 1.0);
+	return pointInTriangle(p, vertex1, vertex2, vertex3);
+}
+
+float blur_edge(vec2 bot1, vec2 bot2, vec2 top, vec2 testPt) {
+	vec2 lineDir = bot1 - top;
+	vec2 perpDir = vec2(lineDir.y, -lineDir.x);
+	vec2 dirToPt1 = bot1 - testPt;
+	float dist1 = abs(dot(normalize(perpDir), dirToPt1));
+
+	lineDir = bot2 - top;
+	perpDir = vec2(lineDir.y, -lineDir.x);
+	dirToPt1 = bot2 - testPt;
+	float min_dist = min(abs(dot(normalize(perpDir), dirToPt1)), dist1);
+
+	if (min_dist < 0.005)
+		return min_dist / 0.005;
+	return 1.0;
+}
+
+vec4 transition(vec2 uv) {
+	if (in_top_triangle(uv)) {
+		if (progress < 0.1)
+			return getFromColor(uv);
+
+		if (uv.y < 0.5) {
+			vec2 vertex1 = vec2(0.5, progress);
+			vec2 vertex2 = vec2(0.5 - progress, 0.0);
+			vec2 vertex3 = vec2(0.5 + progress, 0.0);
+			return mix(
+				getFromColor(uv),
+				getToColor(uv),
+				blur_edge(vertex2, vertex3, vertex1, uv));
+		}
+		if (progress > 0.0)
+			return getToColor(uv);
+		return getFromColor(uv);
+	}
+
+	if (in_bottom_triangle(uv)) {
+		if (uv.y >= 0.5) {
+			vec2 vertex1 = vec2(0.5, 1.0 - progress);
+			vec2 vertex2 = vec2(0.5 - progress, 1.0);
+			vec2 vertex3 = vec2(0.5 + progress, 1.0);
+			return mix(
+				getFromColor(uv),
+				getToColor(uv),
+				blur_edge(vertex2, vertex3, vertex1, uv));
+		}
+		return getFromColor(uv);
+	}
+
+	return getFromColor(uv);
+}
+
+void main() {
+	vec2 uv = gl_FragCoord.xy / size;
+	outColor = transition(uv);
+}