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define(function (require, exports) {
exports.pal0 = function(t){
return vec4(mix(vec3(0),vec3(1), t),1.)
}
exports.pal1 =
exports.rainbow = function(t){
return vec4(pal(t, vec3(.5),vec3(.5),vec3(1),vec3(0,0.33,0.67)),1.)
}
exports.pal2 =
exports.hotcool = function(t){
return vec4(pal(t, vec3(.5),vec3(.5),vec3(1),vec3(0,0.1,0.2)),1.)
}
exports.pal3 =
exports.pinkblue = function(t){
return vec4(pal(t, vec3(.5),vec3(.5),vec3(1),vec3(0.3,0.2,0.2)),1.)
}
exports.pal4 =
exports.greenish = function(t){
return vec4(pal(t, vec3(.5),vec3(.5),vec3(1.,1.,.5),vec3(0.8,0.9,0.3)),1.)
}
exports.pal5 =
exports.dipper = function(t){
return vec4(pal(t, vec3(.5),vec3(.5),vec3(1.,0.7,.4),vec3(0,0.15,0.20)),1.)
}
exports.pal6 =
exports.purply = function(t){
return vec4(pal(t, vec3(.5),vec3(.5),vec3(2.,1.0,0.),vec3(0.5,0.2,0.25)),1.)
}
exports.pal7 =
exports.reddish = function(t){
return vec4(pal(t, vec3(.8,.5,.4),vec3(.2,.4,.2),vec3(2.,1.0,1.0),vec3(0.,0.25,0.25)),1.)
}
exports.pal = function (t, a, b, c, d) {
return a + b * cos(6.28318 * (c * t + d));
}
exports.texture = require('$resources/textures/noise.png');
exports.checkertex = require('$resources/textures/checker.png');
exports.crystaltex = require('$resources/textures/hex_tiles.png');
exports.fetch = function (pos) {
return texture.sample(pos)
}
exports.band_with_dither = function (y, col) {
var f = fract(y);
f = pow(f, 0.5);
col.xyz *= smoothstep(0.49, 0.47, abs(f - 0.5));
col.xyz *= 0.5 + 0.5 * sqrt(4.0 * f * (1.0 - f));
var texc = mod((vec2(gl_FragCoord.x, 1.0 - gl_FragCoord.y) + vec2(0.5)) / texture.size.xy, 1.0);
col.xyz += 0.01 * texture.sample(texc).xyz;
return col;
}
exports.dither = function(col){
var texc = mod((vec2(gl_FragCoord.x, 1.0 - gl_FragCoord.y) + vec2(0.5)) / texture.size.xy, 1.0);
col.xyz += 0.03 * texture.sample(texc).xyz;
return col;
}
exports.dithercrystal = function(col, time){
var texc = mod((vec2(gl_FragCoord.x, 1.0 - gl_FragCoord.y) + vec2(0.5)) / texture.size.xy, 1.0);
var R = crystaltex.sample(mod(texc*0.2,1.0)).x * crystaltex.sample(mod(vec2(0,time*0.12314) +texc.yx*0.625123,1.0)).y;
R = 1.0- R;
R = R*R*R;
col.xyz *= 0.6+R;
return col;
}
exports.checker = function(col){
var texc = mod((vec2(gl_FragCoord.x, 1.0 - gl_FragCoord.y) + vec2(0.5)) / checkertex.size.xy, 1.0);
col.xyz += 0.03 * checkertex.sample(texc).xyz;
return col;
}
exports.band_no_dither = function (y, col) {
var f = fract(y);
col *= smoothstep(0.49, 0.47, abs(f - 0.5));
col *= 0.5 + 0.5 * sqrt(4.0 * f * (1.0 - f));
return col;
}
exports.hsv2rgb = function (hsv) {
return hsv.z * (1.0 + 0.5 * hsv.y * (cos(6.2832 * (hsv.x + vec3(0.0, 0.6667, 0.3333))) - 1.0));
}
});
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