// luma.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
import { glsl } from "../../../lib/glsl-utils/highlight.js";
// TODO
export const VS_WGSL = /* WGSL */ `\  
void dirlight_setNormal(normal: vec3<f32>) {
  dirlight_vNormal = normalize(normal);
}
`;
// TODO
export const FS_WGSL = /* WGSL */ `\
uniform dirlightUniforms {
  vec3 lightDirection;
} dirlight;

// Returns color attenuated by angle from light source
fn dirlight_filterColor(color: vec4<f32>, dirlightInputs): vec4<f32> {
  const d: float = abs(dot(dirlight_vNormal, normalize(dirlight.lightDirection)));
  return vec4<f32>(color.rgb * d, color.a);
}
`;
const VS_GLSL = `\
out vec3 dirlight_vNormal;
void dirlight_setNormal(vec3 normal) {
dirlight_vNormal = normalize(normal);
}
`;
const FS_GLSL = `\
uniform dirlightUniforms {
vec3 lightDirection;
} dirlight;
in vec3 dirlight_vNormal;
vec4 dirlight_filterColor(vec4 color) {
float d = abs(dot(dirlight_vNormal, normalize(dirlight.lightDirection)));
return vec4(color.rgb * d, color.a);
}
`;
/**
 * Cheap lighting - single directional light, single dot product, one uniform
 */
export const dirlight = {
    name: 'dirlight',
    dependencies: [],
    vs: VS_GLSL,
    fs: FS_GLSL,
    // fragmentInputs: [
    //   {
    //     name: 'dirlight_vNormal',
    //     type: 'vec3<f32>'
    //   }
    // ],
    uniformTypes: {
        lightDirection: 'vec3<f32>'
    },
    defaultUniforms: {
        lightDirection: [1, 1, 2]
    },
    getUniforms
};
function getUniforms(opts = dirlight.defaultUniforms) {
    const uniforms = {};
    if (opts.lightDirection) {
        // eslint-disable-next-line camelcase
        uniforms.dirlight_uLightDirection = opts.lightDirection;
    }
    return uniforms;
}