Wallpaper: swipe left/right/up/down

Shaders/frag/wp_swipe.frag

@@ -0,0 +1,57 @@
+#version 440
+
+layout(location = 0) in vec2 qt_TexCoord0;
+layout(location = 0) out vec4 fragColor;
+
+layout(binding = 1) uniform sampler2D source1;  // Current wallpaper
+layout(binding = 2) uniform sampler2D source2;  // Next wallpaper
+
+layout(std140, binding = 0) uniform buf {
+    mat4 qt_Matrix;
+    float qt_Opacity;
+    float progress;      // Transition progress (0.0 to 1.0)
+    float direction;     // 0=left, 1=right, 2=up, 3=down
+    float smoothness;    // Edge smoothness (0.01 to 0.5, default 0.05)
+} ubuf;
+
+void main() {
+    vec2 uv = qt_TexCoord0;
+    vec4 color1 = texture(source1, uv);  // Current (old) wallpaper
+    vec4 color2 = texture(source2, uv);  // Next (new) wallpaper
+    
+    float edge = 0.0;
+    float factor = 0.0;
+    
+    // Extend the progress range to account for smoothness
+    // This ensures the transition completes fully at the edges
+    float extendedProgress = ubuf.progress * (1.0 + 2.0 * ubuf.smoothness) - ubuf.smoothness;
+    
+    // Calculate edge position based on direction
+    // As progress goes from 0 to 1, we reveal source2 (new wallpaper)
+    if (ubuf.direction < 0.5) {
+        // Swipe from right to left (new image enters from right)
+        edge = 1.0 - extendedProgress;
+        factor = smoothstep(edge - ubuf.smoothness, edge + ubuf.smoothness, uv.x);
+        fragColor = mix(color1, color2, factor);
+    } 
+    else if (ubuf.direction < 1.5) {
+        // Swipe from left to right (new image enters from left)
+        edge = extendedProgress;
+        factor = smoothstep(edge - ubuf.smoothness, edge + ubuf.smoothness, uv.x);
+        fragColor = mix(color2, color1, factor);
+    }
+    else if (ubuf.direction < 2.5) {
+        // Swipe from bottom to top (new image enters from bottom)
+        edge = 1.0 - extendedProgress;
+        factor = smoothstep(edge - ubuf.smoothness, edge + ubuf.smoothness, uv.y);
+        fragColor = mix(color1, color2, factor);
+    }
+    else {
+        // Swipe from top to bottom (new image enters from top)
+        edge = extendedProgress;
+        factor = smoothstep(edge - ubuf.smoothness, edge + ubuf.smoothness, uv.y);
+        fragColor = mix(color2, color1, factor);
+    }
+    
+    fragColor *= ubuf.qt_Opacity;
+}