v4k-git-backup/demos/html5/art/fx/fxVignette.fs

13 lines
332 B
GLSL

uniform float vignette = 0.75;
void mainImage( out vec4 fragColor, in vec2 fragCoord ) {
vec2 uv = fragCoord.xy / iResolution.xy;
vec4 src = texture( iChannel0, uv );
vec3 color = src.rgb;
color *= (1.0 - vignette) + vignette * 16.0 * uv.x * uv.y * (1.0-uv.x) * (1.0-uv.y);
fragColor = vec4(color, src.a);
}