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import XRViewport from './XRViewport.js'
import MatrixMath from './fill/MatrixMath.js'
/*
An XRView describes a single view into an XR scene.
It provides several values directly, and acts as a key to query view-specific values from other interfaces.
*/
export default class XRView {
constructor(fov, depthNear, depthFar, eye=null){
this._fov = fov
this._depthNear = depthNear
this._depthFar = depthFar
this._eye = eye
this._viewport = new XRViewport(0, 0, 1, 1)
this._projectionMatrix = new Float32Array(16)
MatrixMath.mat4_perspectiveFromFieldOfView(this._projectionMatrix, this._fov, this._depthNear, this._depthFar)
}
get eye(){ return this._eye }
get projectionMatrix(){ return this._projectionMatrix }
setProjectionMatrix(array16){
for(let i=0; i < 16; i++){
this._projectionMatrix[i] = array16[i]
}
}
getViewport(layer){
if(this._eye === XRView.LEFT){
this._viewport.x = 0
this._viewport.y = 0
this._viewport.width = layer.framebufferWidth / 2
this._viewport.height = layer.framebufferHeight
} else if(this._eye === XRView.RIGHT){
this._viewport.x = layer.framebufferWidth / 2
this._viewport.y = 0
this._viewport.width = layer.framebufferWidth / 2
this._viewport.height = layer.framebufferHeight
} else {
this._viewport.x = 0
this._viewport.y = 0
this._viewport.width = layer.framebufferWidth
this._viewport.height = layer.framebufferHeight
}
return this._viewport
}
}
XRView.LEFT = 'left'
XRView.RIGHT = 'right'
XRView.EYES = [XRView.LEFT, XRView.RIGHT]