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2.0) * 0.7;  // Centered, scaled\n}\n\nfloat toGaussian(uvec2 p, uint offset) {\n    float sum = hashf(p, offset) + hashf(p, offset + 1u) \n              + hashf(p, offset + 2u) + hashf(p, offset + 3u);\n    return (sum - 2.0) * 0.7;\n}\n\n// Smooth noise with better interpolation\nfloat smoothNoise(vec2 p) {\n    vec2 i = floor(p);\n    vec2 f = fract(p);\n    \n    // Quintic interpolation (less banding than cubic)\n    f = f * f * f * (f * (f * 6.0 - 15.0) + 10.0);\n    \n    uvec2 ui = uvec2(i);\n    float a = toGaussian(ui);\n    float b = toGaussian(ui + uvec2(1u, 0u));\n    float c = toGaussian(ui + uvec2(0u, 1u));\n    float d = toGaussian(ui + uvec2(1u, 1u));\n    \n    return mix(mix(a, b, f.x), mix(c, d, f.x), f.y);\n}\n\nfloat smoothNoise(vec2 p, uint offset) {\n    vec2 i = floor(p);\n    vec2 f = fract(p);\n    \n    f = f * f * f * (f * (f * 6.0 - 15.0) + 10.0);\n    \n    uvec2 ui = uvec2(i);\n    float a = toGaussian(ui, offset);\n    float b = toGaussian(ui + uvec2(1u, 0u), offset);\n    float c = toGaussian(ui + uvec2(0u, 1u), offset);\n    float d = toGaussian(ui + uvec2(1u, 1u), offset);\n    \n    return mix(mix(a, b, f.x), mix(c, d, f.x), f.y);\n}\n\nvoid main() {\n    vec4 color = texture(u_image0, v_texCoord);\n    \n    // Luminance (Rec.709)\n    float luma = dot(color.rgb, vec3(0.2126, 0.7152, 0.0722));\n    \n    // Grain UV (resolution-independent)\n    vec2 grainUV = v_texCoord * u_resolution / max(u_float1, 0.01);\n    uvec2 grainPixel = uvec2(grainUV);\n    \n    float g;\n    vec3 grainRGB;\n    \n    if (u_int0 == 1) {\n        // Grainy mode: pure hash noise (no interpolation = no banding)\n        g = toGaussian(grainPixel);\n        grainRGB = vec3(\n            toGaussian(grainPixel, 100u),\n            toGaussian(grainPixel, 200u),\n            toGaussian(grainPixel, 300u)\n        );\n    } else {\n        // Smooth mode: interpolated with quintic curve\n        g = smoothNoise(grainUV);\n        grainRGB = vec3(\n            smoothNoise(grainUV, 100u),\n            smoothNoise(grainUV, 200u),\n            smoothNoise(grainUV, 300u)\n        );\n    }\n    \n    // Luminance weighting (less grain in highlights)\n    float lumWeight = mix(1.0, 1.0 - luma, clamp(u_float3, 0.0, 1.0));\n    \n    // Strength\n    float strength = u_float0 * 0.15;\n    \n    // Color vs monochrome grain\n    vec3 grainColor = mix(vec3(g), grainRGB, clamp(u_float2, 0.0, 1.0));\n    \n    color.rgb += grainColor * strength * lumWeight;\n    fragColor0 = vec4(clamp(color.rgb, 0.0, 1.0), color.a);\n}\n", "from_input"]}, {"id": 21, "type": "CustomCombo", "pos": [4280, -780], "size": [210, 153.8888931274414], "flags": {}, "order": 0, "mode": 0, "inputs": [{"label": "grain_mode", "localized_name": "choice", "name": "choice", "type": "COMBO", "widget": {"name": "choice"}, "link": null}], "outputs": [{"localized_name": "STRING", "name": "STRING", "type": "STRING", "links": null}, {"localized_name": "INDEX", "name": "INDEX", "type": "INT", "links": [30]}], "properties": {"Node name for S&R": "CustomCombo"}, "widgets_values": ["Smooth", 0, "Smooth", "Grainy", ""]}, {"id": 17, "type": "PrimitiveFloat", "pos": [4276.671470760602, -1180.3256994061358], "size": [210, 58], "flags": {}, "order": 1, "mode": 0, "inputs": [{"label": "grain_amount", "localized_name": "value", "name": "value", "type": "FLOAT", "widget": {"name": "value"}, "link": null}], "outputs": [{"localized_name": "FLOAT", "name": "FLOAT", "type": "FLOAT", "links": [26]}], "title": "Grain amount", "properties": {"Node name for S&R": "PrimitiveFloat", "min": 0, "max": 1, "step": 0.05, "precision": 2}, "widgets_values": [0.25]}, {"id": 18, "type": "PrimitiveFloat", "pos": [4280, -1080], "size": [210, 58], "flags": {}, "order": 2, "mode": 0, "inputs": [{"label": "grain_size", "localized_name": "value", "name": "value", "type": "FLOAT", "widget": {"name": "value"}, "link": null}], "outputs": [{"localized_name": "FLOAT", "name": "FLOAT", "type": "FLOAT", "links": [27]}], "title": "Grain size", "properties": {"Node name for S&R": "PrimitiveFloat", "min": 0.05, "max": 3, "precision": 2, "step": 0.05}, "widgets_values": [0.1]}, {"id": 19, "type": "PrimitiveFloat", "pos": [4280, -980], "size": [210, 58], "flags": {}, "order": 3, "mode": 0, "inputs": [{"label": "color_amount", "localized_name": "value", "name": "value", "type": "FLOAT", "widget": {"name": "value"}, "link": null}], "outputs": [{"localized_name": "FLOAT", "name": "FLOAT", "type": "FLOAT", "links": [28]}], "title": "Color amount", "properties": {"Node name for S&R": "PrimitiveFloat", "min": 0, "max": 1, "precision": 2, "step": 0.05}, "widgets_values": [0]}, {"id": 20, "type": "PrimitiveFloat", "pos": [4280, -880], "size": [210, 58], "flags": {}, "order": 4, "mode": 0, "inputs": [{"label": "shadow_focus", "localized_name": "value", "name": "value", "type": "FLOAT", "widget": {"name": "value"}, "link": null}], "outputs": [{"localized_name": "FLOAT", "name": "FLOAT", "type": "FLOAT", "links": [29]}], "title": "Luminance bias", "properties": {"Node name for S&R": "PrimitiveFloat", "min": 0, "max": 1, "precision": 2, "step": 0.05}, "widgets_values": [0]}], "groups": [], "links": [{"id": 26, "origin_id": 17, "origin_slot": 0, "target_id": 15, "target_slot": 2, "type": "FLOAT"}, {"id": 27, "origin_id": 18, "origin_slot": 0, "target_id": 15, "target_slot": 3, "type": "FLOAT"}, {"id": 28, "origin_id": 19, "origin_slot": 0, "target_id": 15, "target_slot": 4, "type": "FLOAT"}, {"id": 29, "origin_id": 20, "origin_slot": 0, "target_id": 15, "target_slot": 5, "type": "FLOAT"}, {"id": 30, "origin_id": 21, "origin_slot": 1, "target_id": 15, "target_slot": 7, "type": "INT"}, {"id": 22, "origin_id": -10, "origin_slot": 0, "target_id": 15, "target_slot": 0, "type": "IMAGE"}, {"id": 23, "origin_id": 15, "origin_slot": 0, "target_id": -20, "target_slot": 0, "type": "IMAGE"}], "extra": {"workflowRendererVersion": "LG"}, "category": "Image Tools/Color adjust"}]}}