65 lines
2.1 KiB
JavaScript
65 lines
2.1 KiB
JavaScript
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/**
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* Roling mass illumination shader - intended primarily for darkness
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*/
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class RoilingDarknessShader extends AdaptiveDarknessShader {
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static fragmentShader = `
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${this.SHADER_HEADER}
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${this.PERCEIVED_BRIGHTNESS}
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${this.PRNG}
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${this.NOISE}
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${this.FBM(3)}
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void main() {
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${this.FRAGMENT_BEGIN}
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// Creating distortion with vUvs and fbm
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float distortion1 = fbm( vec2(
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fbm( vUvs * 2.5 + time * 0.5),
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fbm( (-vUvs - vec2(0.01)) * 5.0 + time * INVTHREE)));
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float distortion2 = fbm( vec2(
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fbm( -vUvs * 5.0 + time * 0.5),
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fbm( (vUvs + vec2(0.01)) * 2.5 + time * INVTHREE)));
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// Timed values
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float t = -time * 0.5;
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float cost = cos(t);
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float sint = sin(t);
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// Rotation matrix
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mat2 rotmat = mat2(cost, -sint, sint, cost);
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vec2 uv = vUvs;
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// Applying rotation before distorting
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uv -= vec2(0.5);
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uv *= rotmat;
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uv += vec2(0.5);
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// Amplify distortions
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vec2 dstpivot = vec2( sin(min(distortion1 * 0.1, distortion2 * 0.1)),
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cos(min(distortion1 * 0.1, distortion2 * 0.1)) ) * INVTHREE
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- vec2( cos(max(distortion1 * 0.1, distortion2 * 0.1)),
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sin(max(distortion1 * 0.1, distortion2 * 0.1)) ) * INVTHREE ;
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vec2 apivot = PIVOT - dstpivot;
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uv -= apivot;
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uv *= 1.13 + 1.33 * (cos(sqrt(max(distortion1, distortion2)) + 1.0) * 0.5);
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uv += apivot;
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// distorted distance
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float ddist = clamp(distance(uv, PIVOT) * 2.0, 0.0, 1.0);
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// R'lyeh Ftagnh !
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float smooth = smoothstep(borderDistance, borderDistance * 1.2, ddist);
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float inSmooth = min(smooth, 1.0 - smooth) * 2.0;
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// Creating the spooky membrane around the bright area
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vec3 membraneColor = vec3(1.0 - inSmooth);
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finalColor *= (mix(color, color * 0.33, darknessLevel) * colorationAlpha);
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finalColor = mix(finalColor,
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vec3(0.0),
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1.0 - smoothstep(0.25, 0.30 + (intensity * 0.2), ddist));
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finalColor *= membraneColor;
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${this.FRAGMENT_END}
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}`;
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}
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