100 lines
3.0 KiB
Plaintext
100 lines
3.0 KiB
Plaintext
// From https://godotshaders.com/snippet/2d-noise/
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uniform sampler2D SCREEN_TEXTURE;
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uniform highp vec2 positionInput;
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uniform highp vec2 renderScale;
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uniform highp float life;
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uniform highp float range;
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highp vec2 random(highp vec2 uv){
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uv = vec2( dot(uv, vec2(127.1,311.7) ),
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dot(uv, vec2(269.5,183.3) ) );
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return -1.0 + 2.0 * fract(sin(uv) * 43758.5453123);
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}
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highp float noise(highp vec2 uv) {
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highp vec2 uv_index = floor(uv);
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highp vec2 uv_fract = fract(uv);
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highp vec2 blur = smoothstep(0.0, 1.0, uv_fract);
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return mix( mix( dot( random(uv_index + vec2(0.0,0.0) ), uv_fract - vec2(0.0,0.0) ),
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dot( random(uv_index + vec2(1.0,0.0) ), uv_fract - vec2(1.0,0.0) ), blur.x),
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mix( dot( random(uv_index + vec2(0.0,1.0) ), uv_fract - vec2(0.0,1.0) ),
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dot( random(uv_index + vec2(1.0,1.0) ), uv_fract - vec2(1.0,1.0) ), blur.x), blur.y) * 0.5 + 0.5;
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}
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highp float fbm(highp vec2 uv) {
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const int octaves = 6;
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highp float amplitude = 0.5;
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highp float frequency = 3.0;
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highp float value = 0.0;
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for(int i = 0; i < octaves; i++) {
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value += amplitude * noise(frequency * uv);
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amplitude *= 0.5;
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frequency *= 2.0;
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}
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return value;
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}
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void fragment() {
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highp vec2 finalCoords = (FRAGCOORD.xy - positionInput) / (renderScale * 32.0);
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highp float distanceToCenter = length(finalCoords);
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highp float nlife = pow(sin(clamp(life, 0.0, 1.0) * 3.141592), 0.5);
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highp float on = ((range - distanceToCenter) / range);
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highp float n = on;
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highp vec2 fcOffset = vec2(fbm(finalCoords.xy + life / 2.0),fbm(finalCoords.yx + life / 2.0));
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n *= fbm((finalCoords + fcOffset) / (nlife / (n * 1.5))) * 1.1;
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n *= clamp(nlife, 0.0, 1.0);
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highp float a = 0.0; // Alpha
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highp float p = 0.0; // Position between L and R stops
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lowp vec3 lCol = vec3(0.0); // Left stop color
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lowp vec3 rCol = vec3(0.0); // Right stop color
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if (n <= 0.05) {
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p = 0.0;
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a = 0.0;
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lCol = vec3(0.0);
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rCol = vec3(0.0);
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} else if (n < 0.132) {
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p = (n - 0.05) / (0.132 - 0.05);
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a = p;
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lCol = vec3(0.0);
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rCol = vec3(0.098, 0.406, 0.112);
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} else if (n < 0.186) {
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p = (n - 0.132) / (0.186 - 0.132);
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a = 1.0;
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lCol = vec3(0.098, 0.406, 0.112);
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rCol = vec3(0.168, 1.000, 0.288);
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} else if (n < 0.388) {
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p = (n - 0.186) / (0.388 - 0.186);
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a = 1.0;
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lCol = vec3(0.168, 1.000, 0.288);
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rCol = vec3(0.583, 1.000, 0.640);
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} else if (n >= 0.388) {
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p = (n - 0.388) / 0.5;
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a = 1.0;
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lCol = vec3(0.583, 1.000, 0.640);
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rCol = vec3(1.000, 1.000, 1.000);
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}
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p = clamp(p, 0.0, 1.0);
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highp vec4 warped = zTextureSpec(SCREEN_TEXTURE, (FRAGCOORD.xy*SCREEN_PIXEL_SIZE)+clamp(on*nlife*(fcOffset/8.0), 0.0, 1.0));
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// Extremely hacky way to detect FoV cones
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highp float osum = warped.r + warped.g + warped.b;
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highp float osr = osum > 0.1 ? 1.0 : 10.0 * osum;
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// Apply overlay
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// FYI: If you want a smoother mix, swap lCol and rCol.
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warped += mix(
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vec4(0.0),
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vec4(mix(rCol, lCol, vec3(p)), a),
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osr
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);
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COLOR = warped;
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}
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