'use strict';

var Extensions = require('../extensions/Extensions.js');
var BlendModeFilter = require('../filters/blend-modes/BlendModeFilter.js');

"use strict";
class OverlayBlend extends BlendModeFilter.BlendModeFilter {
  constructor() {
    super({
      gl: {
        functions: `
                float overlay(float base, float blend)
                {
                    return (base < 0.5) ? (2.0*base*blend) : (1.0-2.0*(1.0-base)*(1.0-blend));
                }

                vec3 blendOverlay(vec3 base, vec3 blend, float opacity)
                {
                    vec3 blended = vec3(
                        overlay(base.r, blend.r),
                        overlay(base.g, blend.g),
                        overlay(base.b, blend.b)
                    );
   
                    return (blended * opacity + base * (1.0 - opacity));
                }
                `,
        main: `
                finalColor = vec4(blendOverlay(back.rgb, front.rgb,front.a), blendedAlpha) * uBlend;
                `
      },
      gpu: {
        functions: `
                fn overlay(base: f32, blend: f32) -> f32
                {
                    return select((1.0-2.0*(1.0-base)*(1.0-blend)), (2.0*base*blend), base < 0.5);
                }

                fn blendOverlay(base: vec3<f32>, blend: vec3<f32>, opacity: f32) -> vec3<f32>
                {
                    let blended = vec3<f32>(
                        overlay(base.r, blend.r),
                        overlay(base.g, blend.g),
                        overlay(base.b, blend.b)
                    );

                    return (blended * opacity + base * (1.0 - opacity));
                }
                `,
        main: `
                out = vec4<f32>(blendOverlay(back.rgb, front.rgb, front.a), blendedAlpha) * blendUniforms.uBlend;
                `
      }
    });
  }
}
/** @ignore */
OverlayBlend.extension = {
  name: "overlay",
  type: Extensions.ExtensionType.BlendMode
};

exports.OverlayBlend = OverlayBlend;
//# sourceMappingURL=OverlayBlend.js.map