@luma.gl/shadertools/dist/modules/lighting/no-material/dirlight.js

Shader module system for luma.gl

// luma.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
// TODO
export const SOURCE_WGSL = /* WGSL */ `\  
struct dirlightUniforms {
  lightDirection: vec3<f32>,
};

alias DirlightNormal = vec3<f32>;

struct DirlightInputs {
  normal: DirlightNormal,
};

@binding(1) @group(0) var<uniform> dirlight : dirlightUniforms;

// For vertex
fn dirlight_setNormal(normal: vec3<f32>) -> DirlightNormal {
  return normalize(normal);
}

// Returns color attenuated by angle from light source
fn dirlight_filterColor(color: vec4<f32>, inputs: DirlightInputs) -> vec4<f32> {
  // TODO - fix default light direction
  // let lightDirection = dirlight.lightDirection;
  let lightDirection = vec3<f32>(1, 1, 1);
  let d: f32 = abs(dot(inputs.normal, normalize(lightDirection)));
  return vec4<f32>(color.rgb * d, color.a);
}
`;
const VS_GLSL = /* glsl */ `\
out vec3 dirlight_vNormal;

void dirlight_setNormal(vec3 normal) {
  dirlight_vNormal = normalize(normal);
}
`;
const FS_GLSL = /* glsl */ `\
uniform dirlightUniforms {
  vec3 lightDirection;
} dirlight;

in vec3 dirlight_vNormal;

// Returns color attenuated by angle from light source
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 = {
    props: {},
    uniforms: {},
    name: 'dirlight',
    dependencies: [],
    source: SOURCE_WGSL,
    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;
}
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