gtk2/demos/gtk-demo/radial.glsl
Matthias Clasen 279d3c08a9 gtk-demo: Rename the transition shader files
Easier to find them when their name matches the title
that we show in the UI.
2020-10-03 00:01:25 -04:00

35 lines
681 B
GLSL

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);
}