Wallpaper: shaders improvements with more parameters and new Stripes shader

Shaders/frag/wp_stripes.frag

@@ -0,0 +1,126 @@
+// ===== wp_stripes.frag =====
+#version 450
+
+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 stripeCount;   // Number of stripes (default 12.0)
+    float angle;         // Angle of stripes in degrees (default 30.0)
+    float smoothness;    // Edge smoothness (0.0 to 1.0, 0=sharp, 1=very smooth)
+    float aspectRatio;   // Width / Height of the screen
+} ubuf;
+
+void main() {
+    vec2 uv = qt_TexCoord0;
+    vec4 color1 = texture(source1, uv);  // Current (old) wallpaper
+    vec4 color2 = texture(source2, uv);  // Next (new) wallpaper
+    
+    // Map smoothness from 0.0-1.0 to 0.001-0.1 range
+    // Using a non-linear mapping for better control at low values
+    float mappedSmoothness = mix(0.001, 0.1, ubuf.smoothness * ubuf.smoothness);
+    
+    // Use values directly without forcing defaults
+    float stripes = (ubuf.stripeCount > 0.0) ? ubuf.stripeCount : 12.0;
+    float angleRad = radians(ubuf.angle);
+    float edgeSmooth = mappedSmoothness;
+    
+    // Create a coordinate system for stripes based on angle
+    // At 0°: vertical stripes (divide by x)
+    // At 45°: diagonal stripes
+    // At 90°: horizontal stripes (divide by y)
+    
+    // Transform coordinates based on angle
+    float cosA = cos(angleRad);
+    float sinA = sin(angleRad);
+    
+    // Project the UV position onto the stripe direction
+    // This gives us the position along the stripe direction
+    float stripeCoord = uv.x * cosA + uv.y * sinA;
+    
+    // Perpendicular coordinate (for edge movement)
+    float perpCoord = -uv.x * sinA + uv.y * cosA;
+    
+    // Calculate the range of perpCoord based on angle
+    // This determines how far edges need to travel to fully cover the screen
+    float minPerp = min(min(0.0 * -sinA + 0.0 * cosA, 1.0 * -sinA + 0.0 * cosA),
+                       min(0.0 * -sinA + 1.0 * cosA, 1.0 * -sinA + 1.0 * cosA));
+    float maxPerp = max(max(0.0 * -sinA + 0.0 * cosA, 1.0 * -sinA + 0.0 * cosA),
+                       max(0.0 * -sinA + 1.0 * cosA, 1.0 * -sinA + 1.0 * cosA));
+    
+    // Determine which stripe we're in
+    float stripePos = stripeCoord * stripes;
+    int stripeIndex = int(floor(stripePos));
+    
+    // Determine if this is an odd or even stripe
+    bool isOddStripe = (stripeIndex % 2) == 1;
+    
+    // Calculate the progress for this specific stripe with wave delay
+    // Use absolute stripe position for consistent delay across all stripes
+    float normalizedStripePos = clamp(stripePos / stripes, 0.0, 1.0);
+    
+    // Reduced delay factor and better scaling to match other shaders' timing
+    float maxDelay = 0.15;  // Maximum delay for the last stripe
+    float stripeDelay = normalizedStripePos * maxDelay;
+    
+    // Ensure all stripes complete when progress reaches 1.0
+    // without making the overall animation appear faster
+    float stripeProgress = clamp((ubuf.progress - stripeDelay) / (1.0 - maxDelay), 0.0, 1.0);
+    
+    // Apply smooth easing
+    stripeProgress = smoothstep(0.0, 1.0, stripeProgress);
+    
+    // Use the perpendicular coordinate for edge comparison
+    float yPos = perpCoord;
+    
+    // Calculate edge position for this stripe
+    // Use the actual perpendicular coordinate range for this angle
+    float perpRange = maxPerp - minPerp;
+    float margin = edgeSmooth * 2.0;  // Simplified margin calculation
+    float edgePosition;
+    if (isOddStripe) {
+        // Odd stripes: edge moves from max to min
+        edgePosition = maxPerp + margin - stripeProgress * (perpRange + margin * 2.0);
+    } else {
+        // Even stripes: edge moves from min to max
+        edgePosition = minPerp - margin + stripeProgress * (perpRange + margin * 2.0);
+    }
+    
+    // Determine which wallpaper to show based on rotated position
+    float mask;
+    if (isOddStripe) {
+        // Odd stripes reveal new wallpaper from bottom
+        mask = smoothstep(edgePosition - edgeSmooth, edgePosition + edgeSmooth, yPos);
+    } else {
+        // Even stripes reveal new wallpaper from top
+        mask = 1.0 - smoothstep(edgePosition - edgeSmooth, edgePosition + edgeSmooth, yPos);
+    }
+    
+    // Mix the wallpapers
+    fragColor = mix(color1, color2, mask);
+    
+    // Force exact values at start and end to prevent any bleed-through
+    if (ubuf.progress <= 0.0) {
+        fragColor = color1;  // Only show old wallpaper at start
+    } else if (ubuf.progress >= 1.0) {
+        fragColor = color2;  // Only show new wallpaper at end
+    } else {
+        // Add manga-style edge shadow only during transition
+        float edgeDist = abs(yPos - edgePosition);
+        float shadowStrength = 1.0 - smoothstep(0.0, edgeSmooth * 2.5, edgeDist);
+        shadowStrength *= 0.2 * (1.0 - abs(stripeProgress - 0.5) * 2.0);
+        fragColor.rgb *= (1.0 - shadowStrength);
+        
+        // Add slight vignette during transition for dramatic effect  
+        float vignette = 1.0 - ubuf.progress * 0.1 * (1.0 - abs(stripeProgress - 0.5) * 2.0);
+        fragColor.rgb *= vignette;
+    }
+    
+    fragColor *= ubuf.qt_Opacity;
+}