@polygonjs/polygonjs/dist/src/core/camera/CoreCameraViewOffset.js

node-based WebGL 3D engine https://polygonjs.com

"use strict";
import { ParamConfig } from "../../engine/nodes/utils/params/ParamsConfig";
import { Vector2 } from "three";
import { CameraAttribute } from "./CoreCamera";
import { coreObjectClassFactory } from "../geometry/CoreObjectFactory";
export function CoreCameraViewOffsetParamConfig(Base) {
  return class Mixin extends Base {
    constructor() {
      super(...arguments);
      /** @param min */
      this.min = ParamConfig.VECTOR2([0, 0]);
      /** @param max */
      this.max = ParamConfig.VECTOR2([1, 1]);
    }
  };
}
function cameraViewOffsetMin(coreObjectClass, camera, target) {
  target.set(0, 0);
  coreObjectClass.attribValue(camera, CameraAttribute.VIEW_OFFSET_MIN, 0, target);
}
function cameraViewOffsetMax(coreObjectClass, camera, target) {
  target.set(1, 1);
  coreObjectClass.attribValue(camera, CameraAttribute.VIEW_OFFSET_MAX, 0, target);
}
const _min = new Vector2();
const _max = new Vector2();
export function cameraSetViewOffset(camera, resolution) {
  const coreObjectClass = coreObjectClassFactory(camera);
  const hasMin = coreObjectClass.hasAttribute(camera, CameraAttribute.VIEW_OFFSET_MIN);
  const hasMax = coreObjectClass.hasAttribute(camera, CameraAttribute.VIEW_OFFSET_MAX);
  if (!(hasMin && hasMax)) {
    return;
  }
  cameraViewOffsetMin(coreObjectClass, camera, _min);
  cameraViewOffsetMax(coreObjectClass, camera, _max);
  camera.setViewOffset(
    resolution.x,
    resolution.y,
    _min.x * resolution.x,
    _min.y * resolution.y,
    _max.x * resolution.x,
    _max.y * resolution.y
  );
}