app/node_modules/@babylonjs/core/Cameras/RigModes/stereoscopicRigMode.js

import { Camera } from "../camera.js";
import { Viewport } from "../../Maths/math.viewport.js";
import { PassPostProcess } from "../../PostProcesses/passPostProcess.js";
import { StereoscopicInterlacePostProcessI } from "../../PostProcesses/stereoscopicInterlacePostProcess.js";
/**
 * @internal
 */
export function setStereoscopicRigMode(camera) {
    const isStereoscopicHoriz = camera.cameraRigMode === Camera.RIG_MODE_STEREOSCOPIC_SIDEBYSIDE_PARALLEL || camera.cameraRigMode === Camera.RIG_MODE_STEREOSCOPIC_SIDEBYSIDE_CROSSEYED;
    const isCrossEye = camera.cameraRigMode === Camera.RIG_MODE_STEREOSCOPIC_SIDEBYSIDE_CROSSEYED;
    const isInterlaced = camera.cameraRigMode === Camera.RIG_MODE_STEREOSCOPIC_INTERLACED;
    // Use post-processors for interlacing
    if (isInterlaced) {
        camera._rigCameras[0]._rigPostProcess = new PassPostProcess(camera.name + "_passthru", 1.0, camera._rigCameras[0]);
        camera._rigCameras[1]._rigPostProcess = new StereoscopicInterlacePostProcessI(camera.name + "_stereoInterlace", camera._rigCameras, false, true);
    }
    // Otherwise, create appropriate viewports
    else {
        camera._rigCameras[isCrossEye ? 1 : 0].viewport = new Viewport(0, 0, isStereoscopicHoriz ? 0.5 : 1.0, isStereoscopicHoriz ? 1.0 : 0.5);
        camera._rigCameras[isCrossEye ? 0 : 1].viewport = new Viewport(isStereoscopicHoriz ? 0.5 : 0, isStereoscopicHoriz ? 0 : 0.5, isStereoscopicHoriz ? 0.5 : 1.0, isStereoscopicHoriz ? 1.0 : 0.5);
    }
}
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