'use strict';

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

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

                vec3 blendSoftLight(vec3 base, vec3 blend, float opacity)
                {
                    vec3 blended = vec3(
                        softLight(base.r, blend.r),
                        softLight(base.g, blend.g),
                        softLight(base.b, blend.b)
                    );

                    return (blended * opacity + base * (1.0 - opacity));
                }
                `,
        main: `
                finalColor = vec4(blendSoftLight(back.rgb, front.rgb, front.a), blendedAlpha) * uBlend;
                `
      },
      gpu: {
        functions: `
                fn softLight(base: f32, blend: f32) -> f32
                {
                    return select(2.0 * base * blend + base * base * (1.0 - 2.0 * blend), sqrt(base) * (2.0 * blend - 1.0) + 2.0 * base * (1.0 - blend), blend < 0.5);
                }

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

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

exports.SoftLightBlend = SoftLightBlend;
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