All files / core/src/RenderingEngine/helpers getProjectionScaleMatrix.ts

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import { mat4 } from 'gl-matrix';
 
/**
 * Computes the projection scaling matrix used for canvas stretch.
 * The scaling is applied along the canvas axes.
 *
 * @param aspectRatio - [scaleX, scaleY], where each value controls stretching along the corresponding canvas axis
 * @returns Projection scaling matrix for canvas stretch
 */
export function getProjectionScaleMatrix(aspectRatio: Array<number>): mat4 {
  const [scaleX, scaleY] = aspectRatio;
 
  const projectionScaleMatrix = mat4.fromScaling(mat4.create(), [
    scaleX,
    scaleY,
    1.0,
  ]);
 
  return projectionScaleMatrix;
}