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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | 32979x 32979x 180x 32979x 276x 276x 276x 32979x | import { vec3 } from 'gl-matrix';
import { reflectVector } from './reflectVector';
import type { Point3 } from '../types';
/**
* Returns the adjusted initial view up vector, incorporating vertical and horizontal flips.
*
* @param initialViewUp - The original viewUp vector before flip/rotation.
* @param flipHorizontal - Whether the image is flipped horizontally.
* @param flipVertical - Whether the image is flipped vertically.
* @param viewPlaneNormal - The normal of the view plane (needed for screen vertical axis).
*/
export function adjustInitialViewUp(
initialViewUp: Point3,
flipHorizontal: boolean,
flipVertical: boolean,
viewPlaneNormal: Point3
): Point3 {
let adjustedInitialViewUp = vec3.clone(initialViewUp);
if (flipVertical) {
vec3.negate(adjustedInitialViewUp, adjustedInitialViewUp);
}
if (flipHorizontal) {
const screenVerticalAxis = vec3.cross(
vec3.create(),
viewPlaneNormal,
adjustedInitialViewUp
);
vec3.normalize(screenVerticalAxis, screenVerticalAxis);
adjustedInitialViewUp = reflectVector(
adjustedInitialViewUp,
screenVerticalAxis
);
}
return adjustedInitialViewUp as Point3;
}
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