58 lines
1.3 KiB
Text
58 lines
1.3 KiB
Text
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#version 330 core
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uniform float alpha;
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uniform bool red;
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uniform float max_distorsion_amount;
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// math.glsl
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float sqr(float x);
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// color.glsl
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float srgb_to_luminance(vec3 color);
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vec3 desaturate(vec3 color, float saturation)
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{
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float lum = srgb_to_luminance(color);
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return mix(vec3(lum), color, saturation);
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}
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float opacity(vec2 uv, float amount)
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{
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float dist_factor = 1.0 + distance(uv, vec2(0.5)) * 0.3;
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return 1.0 - min(amount * dist_factor, 1.0);
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}
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/*
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* Distort texcoords according to the intensity of the blackout/redout effect.
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*/
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vec2 redout_distort(vec2 uv)
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{
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// Early exit if there is no blackout/redout
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if (alpha < 1e-5) {
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return uv;
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}
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uv = uv - vec2(0.5);
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float uva = atan(uv.x, uv.y);
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float uvd = sqrt(dot(uv, uv));
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float k = mix(0.0, -max_distorsion_amount, alpha);
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uvd = uvd * (1.0 + k * sqr(uvd));
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return vec2(sin(uva), cos(uva)) * uvd + vec2(0.5);
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}
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/*
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* Apply the blackout/redout effect.
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*/
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vec3 redout_apply(vec3 color, vec2 uv)
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{
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// Early exit if there is no blackout/redout
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if (alpha < 1e-5) {
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return color;
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}
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color *= opacity(uv, alpha);
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if (red) {
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color = mix(color, vec3(color.r, 0.0, 0.0), alpha);
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} else {
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color = desaturate(color, 1.0 - alpha);
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}
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return color;
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}
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