lingo3d/lib/systems/pointLightShadowResolutionSystem.js

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

import { getDistanceFromCamera } from "../memo/getDistanceFromCamera";
import { lightIncrementPtr } from "../pointers/lightIncrementPtr";
import { releaseShadowRenderTarget, requestShadowRenderTarget } from "../pools/objectPools/shadowRenderTargetPool";
import updateShadow from "../display/utils/updateShadow";
import { shadowModePtr } from "../pointers/shadowModePtr";
import createInternalSystem from "./utils/createInternalSystem";
const resolutions = [256, 256, 128, 32, 16, 512];
const biases = [-0.02, -0.02, -0.03, -0.04, -0.05, -0.005];
export const pointLightShadowResolutionSystem = createInternalSystem("pointLightShadowResolutionSystem", {
    data: { step: undefined },
    update: (self, data) => {
        if (!self.object3d.intensity || !shadowModePtr[0])
            return;
        const distance = getDistanceFromCamera(self);
        let step = 4;
        if (self.distance > 3000)
            step = 5;
        else {
            if (distance < lightIncrementPtr[0])
                step = 0;
            else if (distance < lightIncrementPtr[1])
                step = 1;
            else if (distance < lightIncrementPtr[2])
                step = 2;
            else if (distance < lightIncrementPtr[3])
                step = 3;
        }
        if (step === data.step)
            return;
        data.step = step;
        const { shadow } = self.object3d;
        const extents = shadow.getFrameExtents();
        const res = resolutions[step];
        shadow.mapSize.setScalar(res);
        shadow.bias = biases[step];
        releaseShadowRenderTarget(shadow.map);
        shadow.map = requestShadowRenderTarget([
            res * extents.x,
            res * extents.y
        ]);
        updateShadow(shadow);
    }
});
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