shader nit iteration

blueprints/.glsl/Brightness_and_Contrast_1.frag

@@ -8,14 +8,15 @@ uniform float u_float1; // Contrast slider -100..100
 in vec2 v_texCoord;
 out vec4 fragColor;
 
-const float EPSILON = 1e-5;
+const float MID_GRAY = 0.18;  // 18% reflectance
 
+// sRGB gamma 2.2 approximation
 vec3 srgbToLinear(vec3 c) {
-    return pow(c, vec3(2.2));
+    return pow(max(c, 0.0), vec3(2.2));
 }
 
 vec3 linearToSrgb(vec3 c) {
-    return pow(c, vec3(1.0/2.2));
+    return pow(max(c, 0.0), vec3(1.0/2.2));
 }
 
 float mapBrightness(float b) {
@@ -32,15 +33,9 @@ void main() {
     float brightness = mapBrightness(u_float0);
     float contrast   = mapContrast(u_float1);
 
-    // Early exit if no adjustment
-    if (abs(brightness) < EPSILON && abs(contrast - 1.0) < EPSILON) {
-        fragColor = orig;
-        return;
-    }
-
     vec3 lin = srgbToLinear(orig.rgb);
 
-    lin = (lin - 0.5) * contrast + brightness + 0.5;
+    lin = (lin - MID_GRAY) * contrast + brightness + MID_GRAY;
 
     // Convert back to sRGB
     vec3 result = linearToSrgb(clamp(lin, 0.0, 1.0));

blueprints/.glsl/Chromatic_Aberration_16.frag

@@ -14,21 +14,26 @@ const int MODE_BARREL   = 2;
 const int MODE_SWIRL    = 3;
 const int MODE_DIAGONAL = 4;
 
+const float AMOUNT_SCALE = 0.0005;
+const float RADIAL_MULT = 4.0;
+const float BARREL_MULT = 8.0;
+const float INV_SQRT2 = 0.70710678118;
+
 void main() {
     vec2 uv = v_texCoord;
     vec4 original = texture(u_image0, uv);
     
-    float amount = u_float0 * 0.0005;
+    float amount = u_float0 * AMOUNT_SCALE;
     
-    if (amount == 0.0) {
+    if (amount < 0.000001) {
         fragColor = original;
         return;
     }
     
     vec2 centered = uv - 0.5;
     float r = length(centered);
-    vec2 dir = normalize(centered + 0.001);
-    vec2 offset;
+    vec2 dir = r > 0.0001 ? centered / r : vec2(0.0);
+    vec2 offset = vec2(0.0);
     
     if (u_int0 == MODE_LINEAR) {
         // Horizontal shift
@@ -36,20 +41,20 @@ void main() {
     }
     else if (u_int0 == MODE_RADIAL) {
         // Outward from center, stronger at edges
-        offset = dir * r * amount * 4.0;
+        offset = dir * r * amount * RADIAL_MULT;
     }
     else if (u_int0 == MODE_BARREL) {
         // Lens distortion simulation (r² falloff)
-        offset = dir * r * r * amount * 8.0;
+        offset = dir * r * r * amount * BARREL_MULT;
     }
     else if (u_int0 == MODE_SWIRL) {
         // Perpendicular to radial (rotational aberration)
         vec2 perp = vec2(-dir.y, dir.x);
-        offset = perp * r * amount * 4.0;
+        offset = perp * r * amount * RADIAL_MULT;
     }
     else if (u_int0 == MODE_DIAGONAL) {
         // 45° offset
-        offset = vec2(amount, amount) * 0.707;
+        offset = vec2(amount, amount) * INV_SQRT2;
     }
     
     float red = texture(u_image0, uv + offset).r;

blueprints/.glsl/Color_Adjustment_15.frag

@@ -10,31 +10,43 @@ uniform float u_float3; // saturation (-100 to 100)
 in vec2 v_texCoord;
 out vec4 fragColor;
 
+const float INPUT_SCALE = 0.01;
+const float TEMP_TINT_PRIMARY = 0.3;
+const float TEMP_TINT_SECONDARY = 0.15;
+const float VIBRANCE_BOOST = 2.0;
+const float SATURATION_BOOST = 2.0;
+const float SKIN_PROTECTION = 0.5;
+const float EPSILON = 0.001;
+const vec3 LUMA_WEIGHTS = vec3(0.299, 0.587, 0.114);
+
 void main() {
     vec4 tex = texture(u_image0, v_texCoord);
     vec3 color = tex.rgb;
     
     // Scale inputs: -100/100 → -1/1
-    float temperature = u_float0 * 0.01;
-    float tint = u_float1 * 0.01;
-    float vibrance = u_float2 * 0.01;
-    float saturation = u_float3 * 0.01;
+    float temperature = u_float0 * INPUT_SCALE;
+    float tint = u_float1 * INPUT_SCALE;
+    float vibrance = u_float2 * INPUT_SCALE;
+    float saturation = u_float3 * INPUT_SCALE;
     
     // Temperature (warm/cool): positive = warm, negative = cool
-    color.r = clamp(color.r + temperature * 0.3, 0.0, 1.0);
-    color.b = clamp(color.b - temperature * 0.3, 0.0, 1.0);
+    color.r += temperature * TEMP_TINT_PRIMARY;
+    color.b -= temperature * TEMP_TINT_PRIMARY;
     
     // Tint (green/magenta): positive = green, negative = magenta
-    color.g = clamp(color.g + tint * 0.3, 0.0, 1.0);
-    color.r = clamp(color.r - tint * 0.15, 0.0, 1.0);
-    color.b = clamp(color.b - tint * 0.15, 0.0, 1.0);
+    color.g += tint * TEMP_TINT_PRIMARY;
+    color.r -= tint * TEMP_TINT_SECONDARY;
+    color.b -= tint * TEMP_TINT_SECONDARY;
     
-    // Vibrance Pro with skin protection
+    // Single clamp after temperature/tint
+    color = clamp(color, 0.0, 1.0);
+    
+    // Vibrance with skin protection
     if (vibrance != 0.0) {
         float maxC = max(color.r, max(color.g, color.b));
         float minC = min(color.r, min(color.g, color.b));
         float sat = maxC - minC;
-        float gray = dot(color, vec3(0.299, 0.587, 0.114));
+        float gray = dot(color, LUMA_WEIGHTS);
         
         if (vibrance < 0.0) {
             // Desaturate: -100 → gray
@@ -43,24 +55,22 @@ void main() {
             // Boost less saturated colors more
             float vibranceAmt = vibrance * (1.0 - sat);
             
-            // Skin tone protection (hardcoded 0.5)
-            float skinTone = 0.0;
-            if (color.r > color.g && color.g > color.b) {
-                float warmth = (color.r - color.b) / max(maxC, 0.001);
-                skinTone = warmth * sat * (1.0 - sat);
-            }
-            vibranceAmt *= (1.0 - skinTone * 0.5);
+            // Branchless skin tone protection
+            float isWarmTone = step(color.b, color.g) * step(color.g, color.r);
+            float warmth = (color.r - color.b) / max(maxC, EPSILON);
+            float skinTone = isWarmTone * warmth * sat * (1.0 - sat);
+            vibranceAmt *= (1.0 - skinTone * SKIN_PROTECTION);
             
-            color = mix(vec3(gray), color, 1.0 + vibranceAmt * 2.0);
+            color = mix(vec3(gray), color, 1.0 + vibranceAmt * VIBRANCE_BOOST);
         }
     }
     
     // Saturation
     if (saturation != 0.0) {
-        float gray = dot(color, vec3(0.299, 0.587, 0.114));
+        float gray = dot(color, LUMA_WEIGHTS);
         float satMix = saturation < 0.0
-            ? 1.0 + saturation          // -100 → gray
-            : 1.0 + saturation * 2.0;   // +100 → 3x boost
+            ? 1.0 + saturation                      // -100 → gray
+            : 1.0 + saturation * SATURATION_BOOST;  // +100 → 3x boost
         color = mix(vec3(gray), color, satMix);
     }
     

blueprints/.glsl/Film_Grain_15.frag

@@ -86,7 +86,7 @@ void main() {
     float luma = dot(color.rgb, vec3(0.2126, 0.7152, 0.0722));
     
     // Grain UV (resolution-independent)
-    vec2 grainUV = v_texCoord * u_resolution / max(u_float1, 0.001);
+    vec2 grainUV = v_texCoord * u_resolution / max(u_float1, 0.01);
     uvec2 grainPixel = uvec2(grainUV);
     
     float g;
@@ -120,5 +120,5 @@ void main() {
     vec3 grainColor = mix(vec3(g), grainRGB, clamp(u_float2, 0.0, 1.0));
     
     color.rgb += grainColor * strength * lumWeight;
-    fragColor0 = vec4(color.rgb, color.a);
+    fragColor0 = vec4(clamp(color.rgb, 0.0, 1.0), color.a);
 }

blueprints/.glsl/Glow_30.frag

@@ -76,6 +76,7 @@ void main() {
     float t1 = threshold + 0.15;
     
     vec2 texelSize = 1.0 / u_resolution;
+    float aspect = u_resolution.x / u_resolution.y;
     float radius2 = radius * radius;
     
     float sampleScale = clamp(radius * 0.75, 0.35, 1.0);
@@ -103,7 +104,7 @@ void main() {
         float fi = float(i);
         float dist = sqrt(fi / float(samples)) * radius * radiusJitter;
         
-        vec2 offset = dir * dist * texelSize;
+        vec2 offset = dir * dist * texelSize * vec2(1.0, aspect);
         vec3 c = texture(u_image0, v_texCoord + offset).rgb;
         float mask = smoothstep(t0, t1, dot(c, LUMA));
         
@@ -120,7 +121,7 @@ void main() {
         );
     }
     
-    glow *= intensity / totalWeight;
+    glow *= intensity / max(totalWeight, 0.001);
     
     if (u_int1 > 0) {
         glow *= hexToRgb(u_int1);

blueprints/.glsl/Hue_and_Saturation_1.frag

@@ -106,23 +106,8 @@ vec3 rgb2hsb(vec3 c) {
 }
 
 vec3 hsb2rgb(vec3 hsb) {
-    float h = hsb.x * 6.0;
-    float s = hsb.y;
-    float b = hsb.z;
-
-    float c = b * s;
-    float x = c * (1.0 - abs(mod(h, 2.0) - 1.0));
-    float m = b - c;
-
-    vec3 rgb;
-    if (h < 1.0)       rgb = vec3(c, x, 0.0);
-    else if (h < 2.0)  rgb = vec3(x, c, 0.0);
-    else if (h < 3.0)  rgb = vec3(0.0, c, x);
-    else if (h < 4.0)  rgb = vec3(0.0, x, c);
-    else if (h < 5.0)  rgb = vec3(x, 0.0, c);
-    else               rgb = vec3(c, 0.0, x);
-
-    return rgb + m;
+    vec3 rgb = clamp(abs(mod(hsb.x * 6.0 + vec3(0.0, 4.0, 2.0), 6.0) - 3.0) - 1.0, 0.0, 1.0);
+    return hsb.z * mix(vec3(1.0), rgb, hsb.y);
 }
 
 //=============================================================================
@@ -149,16 +134,6 @@ float getHueWeight(float hue, float center, float overlap) {
 float getModeWeight(float hue, int mode, float overlap) {
     if (mode == MODE_MASTER || mode == MODE_COLORIZE) return 1.0;
 
-    float centers[6];
-    centers[0] = 0.0;
-    centers[1] = 1.0/6.0;
-    centers[2] = 2.0/6.0;
-    centers[3] = 3.0/6.0;
-    centers[4] = 4.0/6.0;
-    centers[5] = 5.0/6.0;
-
-    int idx = mode - 1;
-
     if (mode == MODE_RED) {
         return max(
             getHueWeight(hue, 0.0, overlap),
@@ -166,7 +141,8 @@ float getModeWeight(float hue, int mode, float overlap) {
         );
     }
 
-    return getHueWeight(hue, centers[idx], overlap);
+    float center = float(mode - 1) / 6.0;
+    return getHueWeight(hue, center, overlap);
 }
 
 //=============================================================================

blueprints/.glsl/Image_Blur_1.frag

@@ -25,60 +25,66 @@ float gaussian(float x, float sigma) {
 void main() {
     vec2 texelSize = 1.0 / u_resolution;
     float radius = max(u_float0, 0.0);
-    
-    // Radial (angular) blur
+
+    // Radial (angular) blur with incremental rotation
     if (u_int0 == BLUR_RADIAL) {
         vec2 center = vec2(0.5);
         vec2 dir = v_texCoord - center;
         float dist = length(dir);
-        
-        // Avoid division by zero
+
         if (dist < 1e-4) {
             fragColor0 = texture(u_image0, v_texCoord);
             return;
         }
-        
+
         vec4 sum = vec4(0.0);
         float totalWeight = 0.0;
         float angleStep = radius * RADIAL_STRENGTH;
-        
+
         dir /= dist;
-        
+
+        float cosStep = cos(angleStep);
+        float sinStep = sin(angleStep);
+
+        float negAngle = -float(RADIAL_SAMPLES) * angleStep;
+        vec2 rotDir = vec2(
+            dir.x * cos(negAngle) - dir.y * sin(negAngle),
+            dir.x * sin(negAngle) + dir.y * cos(negAngle)
+        );
+
         for (int i = -RADIAL_SAMPLES; i <= RADIAL_SAMPLES; i++) {
-            float a = float(i) * angleStep;
-            float s = sin(a);
-            float c = cos(a);
-            vec2 rotatedDir = vec2(
-                dir.x * c - dir.y * s,
-                dir.x * s + dir.y * c
-            );
-            vec2 uv = center + rotatedDir * dist;
+            vec2 uv = center + rotDir * dist;
             float w = 1.0 - abs(float(i)) / float(RADIAL_SAMPLES);
             sum += texture(u_image0, uv) * w;
             totalWeight += w;
+
+            rotDir = vec2(
+                rotDir.x * cosStep - rotDir.y * sinStep,
+                rotDir.x * sinStep + rotDir.y * cosStep
+            );
         }
-        
-        fragColor0 = sum / totalWeight;
+
+        fragColor0 = sum / max(totalWeight, 0.001);
         return;
     }
-    
-    // Gaussian / Box blur
+
+    // Gaussian / Box blur (grid sampling)
     int samples = int(ceil(radius));
-    
+
     if (samples == 0) {
         fragColor0 = texture(u_image0, v_texCoord);
         return;
     }
-    
+
     vec4 color = vec4(0.0);
     float totalWeight = 0.0;
     float sigma = radius / 2.0;
-    
+
     for (int x = -samples; x <= samples; x++) {
         for (int y = -samples; y <= samples; y++) {
             vec2 offset = vec2(float(x), float(y)) * texelSize;
             vec4 sample_color = texture(u_image0, v_texCoord + offset);
-            
+
             float weight;
             if (u_int0 == BLUR_GAUSSIAN) {
                 float dist = length(vec2(float(x), float(y)));
@@ -87,11 +93,11 @@ void main() {
                 // BLUR_BOX
                 weight = 1.0;
             }
-            
+
             color += sample_color * weight;
             totalWeight += weight;
         }
     }
-    
+
     fragColor0 = color / totalWeight;
 }

blueprints/.glsl/Unsharp_Mask_26.frag

@@ -3,9 +3,9 @@ precision highp float;
 
 uniform sampler2D u_image0;
 uniform vec2 u_resolution;
-uniform float u_float0;  // amount    [0.0 – 3.0]  typical: 0.5–1.5
-uniform float u_float1;  // radius    [0.5 – 10.0] blur radius in pixels
-uniform float u_float2;  // threshold [0.0 – 0.1]  min difference to sharpen
+uniform float u_float0;  // amount    [0.0 - 3.0]  typical: 0.5-1.5
+uniform float u_float1;  // radius    [0.5 - 10.0] blur radius in pixels
+uniform float u_float2;  // threshold [0.0 - 0.1]  min difference to sharpen
 
 in vec2 v_texCoord;
 layout(location = 0) out vec4 fragColor0;
@@ -23,27 +23,21 @@ void main() {
     float radius = max(u_float1, 0.5);
     float amount = u_float0;
     float threshold = u_float2;
-    
+
     vec4 original = texture(u_image0, v_texCoord);
-    
+
     // Gaussian blur for the "unsharp" mask
     int samples = int(ceil(radius));
     float sigma = radius / 2.0;
-    
+
     vec4 blurred = vec4(0.0);
     float totalWeight = 0.0;
-    
+
     for (int x = -samples; x <= samples; x++) {
         for (int y = -samples; y <= samples; y++) {
             vec2 offset = vec2(float(x), float(y)) * texel;
             vec2 sampleCoord = v_texCoord + offset;
-            
-            // Boundary check - skip out-of-bounds samples
-            if (sampleCoord.x < 0.0 || sampleCoord.x > 1.0 ||
-                sampleCoord.y < 0.0 || sampleCoord.y > 1.0) {
-                continue;
-            }
-            
+
             float dist = length(vec2(float(x), float(y)));
             float weight = gaussian(dist, sigma);
             blurred += texture(u_image0, sampleCoord) * weight;
@@ -51,18 +45,17 @@ void main() {
         }
     }
     blurred /= totalWeight;
-    
+
     // Unsharp mask = original - blurred
     vec3 mask = original.rgb - blurred.rgb;
-    
-    // Luminance-based threshold (Photoshop-style)
+
+    // Luminance-based threshold with smooth falloff
     float lumaDelta = abs(getLuminance(original.rgb) - getLuminance(blurred.rgb));
-    if (lumaDelta < threshold) {
-        mask = vec3(0.0);
-    }
-    
+    float thresholdScale = smoothstep(0.0, threshold, lumaDelta);
+    mask *= thresholdScale;
+
     // Sharpen: original + mask * amount
     vec3 sharpened = original.rgb + mask * amount;
-    
+
     fragColor0 = vec4(clamp(sharpened, 0.0, 1.0), original.a);
 }