glsl transition between colors.

nullpainter

Aug 10th, 2024 (edited)

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/*
glsl transition between colors.
I pictured it as cutting the interval, as having a playback position inside of that interval ... sort of like movie frames.
*/
vec3 frame(
vec3 a, // start color
vec3 b, // end color
float t1, // start time
float t2, // end time
float t // time
) {
vec3 x = vec3(0,0,0); // black so we have no color if we mix frames together
if(t>=t1 && t<t2){
x=mix(a,b,(t-t1)/(t2-t1));
}
return x;
}
void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
// COLORS
vec3 a=vec3(1,0,0);
vec3 b=vec3(0,1,0);
vec3 c=vec3(0,0,1);
vec3 d=vec3(0,0,0);
vec3 e=vec3(1,0,1);
float PERIOD=9.;
float t = mod(iTime,PERIOD); // 0..PERIOD
vec3 col= // mix "movie frames"
frame(a,b,0.,2.,t)+
frame(b,c,2.,3.,t)+
frame(c,d,3.,5.,t)+
frame(d,e,5.,7.,t)+
frame(e,a,7.,9.,t)+ // back to first color, so it loops smoothly
vec3(0,0,0); // so we can copypaste previous lines and keep + at the end
fragColor = vec4(col,1);
}

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