vicrodh
01adbb7ab4
Shader improvements: - Multi-sample blur (4 corners averaged) - Luminance preservation over saturation - Gradient tint (cool top, warm bottom) for anti-flat look Layout: - Lyrics panel width increased from 560px to 700px (+140px) - Responsive breakpoint adjusted (480px → 620px)
69 lines
2.0 KiB
GLSL
69 lines
2.0 KiB
GLSL
#version 300 es
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/**
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* Ambient Post-Process Shader
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*
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* Displays a PRE-BLURRED texture with subtle ambient motion.
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* Additional GPU-side smoothing via multi-sample.
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*
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* Effects:
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* - Multi-sample blur (4 corners averaged)
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* - Luminance preservation over saturation
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* - Gradient tint (cool top, warm bottom)
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* - Slow UV drift
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* - Subtle zoom breathing
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*/
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precision mediump float;
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in vec2 v_texCoord;
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out vec4 fragColor;
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uniform sampler2D u_texture;
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uniform float u_time;
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uniform float u_intensity;
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void main() {
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vec2 uv = v_texCoord;
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vec2 center = vec2(0.5);
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// Slow UV drift
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float driftX = sin(u_time * 0.1) * 0.04 * u_intensity;
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float driftY = cos(u_time * 0.08) * 0.03 * u_intensity;
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uv += vec2(driftX, driftY);
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// Subtle zoom breathing
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float zoom = 1.0 + sin(u_time * 0.06) * 0.03 * u_intensity;
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uv = center + (uv - center) / zoom;
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// Clamp to valid range
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uv = clamp(uv, 0.0, 1.0);
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// Multi-sample blur (4 corners averaged for extra smoothing)
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float offset = 0.01;
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vec3 c1 = texture(u_texture, uv + vec2( offset, offset)).rgb;
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vec3 c2 = texture(u_texture, uv + vec2(-offset, offset)).rgb;
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vec3 c3 = texture(u_texture, uv + vec2( offset, -offset)).rgb;
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vec3 c4 = texture(u_texture, uv + vec2(-offset, -offset)).rgb;
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vec3 color = (c1 + c2 + c3 + c4) * 0.25;
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// Preserve luminance over saturation
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float luma = dot(color, vec3(0.2126, 0.7152, 0.0722));
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// Avoid division by zero for very dark colors
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float len = length(color);
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if (len > 0.001) {
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color = normalize(color) * luma;
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}
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// Gradient tint (cool top, warm bottom) - anti-flat
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vec3 tintTop = vec3(0.95, 0.97, 1.0); // Cool/blue
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vec3 tintBottom = vec3(1.0, 0.96, 0.92); // Warm/orange
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float t = v_texCoord.y; // Use original UV for gradient
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color *= mix(tintBottom, tintTop, t);
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// Subtle brightness breathing
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float breath = 1.0 + sin(u_time * 0.12) * 0.06 * u_intensity;
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color *= breath;
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fragColor = vec4(color, 1.0);
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}
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