import { ExtensionType } from '../extensions/Extensions.mjs';
import { BlendModeFilter } from '../filters/blend-modes/BlendModeFilter.mjs';

"use strict";
class LinearLightBlend extends BlendModeFilter {
  constructor() {
    super({
      gl: {
        functions: `
                float linearBurn(float base, float blend) {
                    return max(0.0, base + blend - 1.0);
                }

                float linearDodge(float base, float blend) {
                    return min(1.0, base + blend);
                }

                float linearLight(float base, float blend) {
                    return (blend <= 0.5) ? linearBurn(base,2.0*blend) : linearBurn(base,2.0*(blend-0.5));
                }

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

                    return (blended * opacity + base * (1.0 - opacity));
                }
            `,
        main: `
                finalColor = vec4(blendLinearLight(back.rgb, front.rgb,front.a), blendedAlpha) * uBlend;
                `
      },
      gpu: {
        functions: `
                fn linearBurn(base: f32, blend: f32) -> f32
                {
                    return max(0.0, base + blend - 1.0);
                }

                fn linearDodge(base: f32, blend: f32) -> f32
                {
                    return min(1.0, base + blend);
                }

                fn linearLight(base: f32, blend: f32) -> f32
                {
                    return select(linearBurn(base,2.0*(blend-0.5)), linearBurn(base,2.0*blend), blend <= 0.5);
                }

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

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

export { LinearLightBlend };
//# sourceMappingURL=LinearLightBlend.mjs.map