Skip to content

Instantly share code, notes, and snippets.

@patrixr

patrixr/GLSL_light_sample.frag

Created October 17, 2021 02:25
Download ZIP

Revisions

  1. patrixr created this gist Oct 17, 2021.
    22 changes: 22 additions & 0 deletions GLSL_light_sample.frag
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,22 @@
    void mainImage( out vec4 fragColor, in vec2 fragCoord )
    {
    // Time varying pixel color
    vec3 lightColor = vec3(
    clamp(mod(float(iFrame + 50), 100.0) / 100.0, 0.0, 1.0),
    clamp(mod(float(iFrame + 100), 100.0) / 100.0, 0.0, 1.0),
    clamp(mod(float(iFrame), 100.0) / 100.0, 0.0, 1.0)
    );
    vec3 pixelColor = vec3(0.0, 1.0, 1.0);
    vec2 toLight = vec2(iMouse.x - fragCoord.x, iMouse.y - fragCoord.y);

    float lightradius = 150.0;
    float brightness = 1.0;

    // Apply distance to brightness
    brightness *= clamp(1.0 - (length(toLight) / lightradius), 0.0, 1.0);

    vec3 finalcolor = pixelColor.rgb * lightColor * brightness;

    // Output to screen
    fragColor = vec4(finalcolor, 1.0);
    }