Simon Schneegans
95 lines
3.9 KiB
GLSL
95 lines
3.9 KiB
GLSL
//////////////////////////////////////////////////////////////////////////////////////////
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// ) ( //
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// ( /( ( ( ) ( ( ( ( )\ ) ( ( //
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// )\()) ))\ )( ( ( )\ ) )\))( )\ ( (()/( ( )\))( ( //
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// ((_)\ /((_|()\ )\ ) )\ '(()/( ((_)()((_) )\ ) ((_)))\((_)()\ )\ //
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// | |(_|_))( ((_)_(_/( _((_)) )(_)) _(()((_|_)_(_/( _| |((_)(()((_|(_) //
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// | '_ \ || | '_| ' \)) | ' \()| || | \ V V / | ' \)) _` / _ \ V V (_-< //
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// |_.__/\_,_|_| |_||_| |_|_|_| \_, | \_/\_/|_|_||_|\__,_\___/\_/\_//__/ //
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// |__/ //
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// Copyright (c) 2021 Simon Schneegans //
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// Released under the GPLv3 or later. See LICENSE file for details. //
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//////////////////////////////////////////////////////////////////////////////////////////
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// The content from common.glsl is automatically prepended to each shader effect.
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uniform vec2 uSeed;
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// uniform vec3 uColor;
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uniform float uScale;
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// uniform float uWidth;
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uniform float uTurbulence;
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const float SCORCH_WIDTH = 0.1;
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const float BURN_WIDTH = 0.02;
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const float SMOKE_WIDTH = 0.6;
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vec4 getFireColor(float val) {
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return vec4(tritone(val, vec3(0.0), vec3(1.0, 0.8, 0.6), vec3(1.0)), val);
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}
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void main() {
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float hideThreshold = mix(-SCORCH_WIDTH, 1.0 + SMOKE_WIDTH, uProgress);
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vec2 scorchRange = uForOpening ? vec2(hideThreshold - SCORCH_WIDTH, hideThreshold)
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: vec2(hideThreshold, hideThreshold + SCORCH_WIDTH);
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vec2 smokeRange = vec2(hideThreshold - SMOKE_WIDTH, hideThreshold);
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vec2 burnRange = vec2(hideThreshold - BURN_WIDTH, hideThreshold + BURN_WIDTH);
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vec2 uv = cogl_tex_coord_in[0].st / uScale * uSize;
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float noise = simplex2DFractal(uv * 0.005 + uSeed);
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float gradient = rotate(cogl_tex_coord_in[0].st - 0.5, uSeed.x * 2.0 * 3.141).x + 0.5;
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float mask = mix(gradient, noise, 0.15);
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vec2 distort = vec2(0.0);
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if (!uForOpening && (smokeRange.x < mask && mask < smokeRange.y)) {
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distort.y += pow(1.0 - (mask - smokeRange.x) / SMOKE_WIDTH, 2.0) * 0.1;
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}
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if ((uForOpening && mask > scorchRange.x) || (!uForOpening && mask <= scorchRange.y)) {
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distort +=
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0.5 * vec2(dFdx(mask), dFdy(mask)) * (scorchRange.y - mask) / SCORCH_WIDTH * 5.0;
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}
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vec4 oColor = getInputColor(cogl_tex_coord_in[0].st + distort);
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if ((uForOpening && mask > smokeRange.y) || (!uForOpening && mask < smokeRange.y)) {
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oColor = vec4(0.0);
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}
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float smoke =
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smoothstep(0, 1, (mask - smokeRange.x) / SMOKE_WIDTH) * getRelativeEdgeMask(0.1);
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smoke *=
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simplex2DFractal(uv * 0.01 + uSeed - smoke * smoke * vec2(0.0, 0.1 * uDuration));
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float emberNoise =
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simplex2DFractal(uv * 0.075 + uSeed - smoke * vec2(0.0, 0.5 * uDuration));
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if (smokeRange.x < mask && mask < smokeRange.y) {
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oColor = alphaOver(oColor, vec4(0.5 * vec3(smoke), smoke));
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float embers = clamp(pow(emberNoise + 0.32, 100.0), 0.0, 2.0) * smoke;
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embers += clamp(pow(emberNoise + 0.32, 10.0), 0.0, 2.0) * smoke;
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oColor = alphaOver(oColor, getFireColor(embers));
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}
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// Add scorch effect.
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if (scorchRange.x < mask && mask < scorchRange.y) {
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float scorch = smoothstep(1, 0, (mask - scorchRange.x) / SCORCH_WIDTH);
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if (uForOpening) {
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scorch = 1.0 - scorch;
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}
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oColor.rgb = mix(oColor.rgb, mix(oColor.rgb, vec3(0.1, 0.05, 0.02), 0.4), scorch);
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}
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if (burnRange.x < mask && mask < burnRange.y) {
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float fireEdge = smoothstep(1, 0, abs(mask - hideThreshold) / BURN_WIDTH) * oColor.a;
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fireEdge = fireEdge * pow(emberNoise + 0.4, 4.0);
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oColor = alphaOver(oColor, getFireColor(fireEdge));
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}
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setOutputColor(oColor);
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} |