Learning_GTK4_tree/demos/gtk-demo/radial.glsl

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2023-12-12 11:36:42 +01:00
uniform float progress;
uniform sampler2D u_texture1;
uniform sampler2D u_texture2;
vec4 getFromColor (vec2 uv) {
return GskTexture(u_texture1, uv);
}
vec4 getToColor (vec2 uv) {
return GskTexture(u_texture2, uv);
}
// Source: https://gl-transitions.com/editor/Radial
// License: MIT
// Author: Xaychru
const float smoothness = 1.0;
const float PI = 3.141592653589;
vec4 transition(vec2 p) {
vec2 rp = p*2.-1.;
return mix(
getToColor(p),
getFromColor(p),
smoothstep(0., smoothness, atan(rp.y,rp.x) - (progress-.5) * PI * 2.5)
);
}
void mainImage(out vec4 fragColor, in vec2 fragCoord, in vec2 resolution, in vec2 uv)
{
fragColor = transition(uv);
}