lingo3d/lib/memo/getOcclusionMaterial.js

Lingo3D is a React/Vue 3d game development framework that ships with a complete visual editor

import { BackSide, DoubleSide, FrontSide, ShaderChunk, ShaderMaterial } from "three";
import computeOnce from "./utils/computeOnce";
const materialCache = [];
export default computeOnce((object) => {
    const material = object.material;
    const useSkinning = object.type === "SkinnedMesh" ? 1 : 0;
    const useInstancing = object.type === "InstancedMesh" ? 1 : 0;
    const frontSide = material.side === FrontSide ? 1 : 0;
    const backSide = material.side === BackSide ? 1 : 0;
    const doubleSide = material.side === DoubleSide ? 1 : 0;
    const sprite = material.type === "SpriteMaterial" ? 1 : 0;
    const sizeAttenuation = material.sizeAttenuation ? 1 : 0;
    const index = (useSkinning << 1) |
        (useInstancing << 2) |
        (frontSide << 3) |
        (backSide << 4) |
        (doubleSide << 5) |
        (sprite << 6) |
        (sizeAttenuation << 7);
    if (materialCache[index])
        return materialCache[index];
    let vertexShader = ShaderChunk.meshbasic_vert;
    if (sprite) {
        vertexShader = ShaderChunk.sprite_vert;
        if (sizeAttenuation)
            vertexShader = "#define USE_SIZEATTENUATION\n\n" + vertexShader;
    }
    const renderMaterial = (materialCache[index] = new ShaderMaterial({
        vertexShader: vertexShader,
        fragmentShader: `
            uniform vec4 objectId;
            void main() {
                gl_FragColor = objectId;
            }
        `,
        side: material.side
    }));
    renderMaterial.uniforms = { objectId: { value: [1.0, 1.0, 1.0, 1.0] } };
    return renderMaterial;
});
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