fabric/src/filters/shaders/brightness.ts

Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.

export const fragmentSource = `
  precision highp float;
  uniform sampler2D uTexture;
  uniform float uBrightness;
  varying vec2 vTexCoord;
  void main() {
    vec4 color = texture2D(uTexture, vTexCoord);
    color.rgb += uBrightness;
    gl_FragColor = color;
  }
`;