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runnable transition
GLSL transition function. Stronghold supplies two demo textures and progress/time uniforms.
Code
// Author: martiniti
// License: MIT
vec4 transition (vec2 uv) {
float s = 2.0 - abs((uv.y - 0.5) / (progress - 1.0)) - 2.0 * progress;
return mix(
getFromColor(uv),
getToColor(uv),
smoothstep(0.5, 0.0, s)
);
}