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multi-layer-eqr180new.html
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multi-layer-eqr180new.html
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<!doctype html>
<!--
Copyright 2020 The Immersive Web Community Group
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-->
<html>
<head>
<meta charset='utf-8'>
<meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no'>
<meta name='mobile-web-app-capable' content='yes'>
<meta name='apple-mobile-web-app-capable' content='yes'>
<link rel='icon' type='image/png' sizes='32x32' href='favicon-32x32.png'>
<link rel='icon' type='image/png' sizes='96x96' href='favicon-96x96.png'>
<link rel='stylesheet' href='css/common.css'>
<title>Multilayer Equirect 180</title>
<script src="js/wglu/wglu-program.js"></script>
<script src="js/wglu/wglu-url.js"></script>
<script src="js/stereo-util.js"></script>
</head>
<body>
<header>
<details open>
<summary>Multilayer Equirect 180</summary>
<p>
This sample shows how to draw a scene into a projection layer.
<a class="back" href="./">Back</a>
</p>
<input type="checkbox" id="do_stencil_buffer">stencil buffer</input>
<input type="checkbox" id="stereo_layer" value="Bike">stereo equirect layer</input>
<input type="checkbox" id="change_order">change order</input>
<input type="checkbox" id="update_cylinder_every_frame">Update cyl every frm</input>
<input type="number" id="radius_txt" value="10">Radius</input>
</details>
</header>
<script type="module">
import {WebXRButton} from './js/util/webxr-button.js';
import {Scene, WebXRView} from './js/render/scenes/scene.js';
import {Node} from './js/render/core/node.js';
import {Gltf2Node} from './js/render/nodes/gltf2.js';
import {Renderer, createWebGLContext} from './js/render/core/renderer.js';
import {CubeSeaNode} from './js/render/nodes/cube-sea.js';
import {InlineViewerHelper} from './js/util/inline-viewer-helper.js';
import {QueryArgs} from './js/util/query-args.js';
import {BoxBuilder} from './js/render/geometry/box-builder.js';
import {PbrMaterial} from './js/render/materials/pbr.js';
import {mat4, vec3, quat} from './js/render/math/gl-matrix.js';
// If requested, use the polyfill to provide support for mobile devices
// and devices which only support WebVR.
import WebXRPolyfill from './js/third-party/webxr-polyfill/build/webxr-polyfill.module.js';
if (QueryArgs.getBool('usePolyfill', true)) {
let polyfill = new WebXRPolyfill();
}
let noAlpha = WGLUUrl.getBool('noAlpha', false);
let boxTable = {};
let eqr_pos = { x: 0.0, y: 0.0, z: 0.0 };
let eqr_orient = { yaw: 0.0, pitch: 0.0, roll: 0.0 };
// XR globals.
let do_stencil_buffer = document.getElementById('do_stencil_buffer');
let xrButton = null;
let xrImmersiveRefSpace = null;
let inlineViewerHelper = null;
let xrGLFactory = null;
let xrFramebuffer = null;
let xrDepthBuffer = null;
let gl_ext = null;
let xr_stencil = false;
let texture_copied = false;
let stereoUtil = null;
let number_of_images = 0;
// WebGL scene globals.
let stereo_layer = document.getElementById("stereo_layer");
let gl = null;
let renderer = null;
let scene = new Scene();
scene.addNode(new CubeSeaNode({cubeCount: 5, halfOnly:true, autoRotate:false}));
let eqr_texture;
let eqr_texture_width;
let eqr_texture_height;
let eqr_layer = null;
let proj_layer = null;
let cyl_texture;
let cyl_texture_width;
let cyl_texture_height;
let cyl_layer = null;
let eqr_layer_idx = 0;
let proj_layer_idx = 1;
let cyl_layer_idx = 2;
function initXR() {
xrButton = new WebXRButton({
onRequestSession: onRequestSession,
onEndSession: onEndSession
});
document.querySelector('header').appendChild(xrButton.domElement);
if (navigator.xr) {
navigator.xr.isSessionSupported('immersive-vr').then((supported) => {
xrButton.enabled = supported;
});
navigator.xr.requestSession('inline').then(onSessionStarted);
}
}
//
// Initialize a texture and load an image.
// When the image finished loading copy it into the texture.
//
function loadTexture(gl, url, complete_callback) {
const texture = gl.createTexture();
loadIntoTexture(gl, texture, url, complete_callback);
return texture;
}
function isPowerOf2(value) {
return (value & (value - 1)) == 0;
}
function loadIntoTexture(gl, texture, url, complete_callback) {
gl.bindTexture(gl.TEXTURE_2D, texture);
// Because images have to be download over the internet
// they might take a moment until they are ready.
// Until then put a single pixel in the texture so we can
// use it immediately. When the image has finished downloading
// we'll update the texture with the contents of the image.
const level = 0;
const internalFormat = gl.RGBA;
const width = 1;
const height = 1;
const border = 0;
const srcFormat = gl.RGBA;
const srcType = gl.UNSIGNED_BYTE;
const pixel = new Uint8Array([0, 0, 255, 255]); // opaque blue
gl.texImage2D(gl.TEXTURE_2D, level, internalFormat,
width, height, border, srcFormat, srcType,
pixel);
const image = new Image();
image.onload = function() {
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, level, internalFormat,
srcFormat, srcType, image);
// WebGL1 has different requirements for power of 2 images
// vs non power of 2 images so check if the image is a
// power of 2 in both dimensions.
if (isPowerOf2(image.width) && isPowerOf2(image.height)) {
// Yes, it's a power of 2. Generate mips.
gl.generateMipmap(gl.TEXTURE_2D);
//?gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR);
//?gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR_MIPMAP_LINEAR);
} else {
// No, it's not a power of 2. Turn of mips and set
// wrapping to clamp to edge
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
}
complete_callback(image.width, image.height);
};
eqr_texture_width = eqr_texture_height = undefined;
image.src = url;
}
function initGL() {
if (gl)
return;
gl = createWebGLContext({
xrCompatible: true,
webgl2: true,
alpha: !noAlpha
});
document.body.appendChild(gl.canvas);
gl_ext = gl.getExtension('WEBGL_depth_texture');
function onResize() {
gl.canvas.width = gl.canvas.clientWidth * window.devicePixelRatio;
gl.canvas.height = gl.canvas.clientHeight * window.devicePixelRatio;
}
window.addEventListener('resize', onResize);
onResize();
// Set up a non-black clear color so that we can see if something renders wrong.
gl.clearColor(0.1, 0.2, 0.3, 1.0);
renderer = new Renderer(gl);
scene.setRenderer(renderer);
stereoUtil = new VRStereoUtil(gl);
}
const BOX_SIZE = 0.03;
const BOX_MOTION_RANGE = 0.010;
const BOX_SEPARATION = 0.04;
const BOX_SET_HEIGHT = 0.03;
const BOX_SET_DEPTH = -0.06;
class GamepadBox extends Node {
constructor(position) {
super();
this.position = position;
let boxBuilder = new BoxBuilder();
boxBuilder.pushCube([0, 0, 0], BOX_SIZE);
let boxPrimitive = boxBuilder.finishPrimitive(renderer);
let boxMaterial = new PbrMaterial();
boxMaterial.baseColorFactor.value = [0.1, 0.1, 0.1, 1]; // grey
this.renderPrimitive = renderer.createRenderPrimitive(boxPrimitive, boxMaterial);
this.addRenderPrimitive(this.renderPrimitive);
mat4.identity(this.matrix);
mat4.translate(this.matrix, this.matrix, this.position);
this._value = 0.0;
this._pressed = false;
this._touched = false;
this._dx = 0.0;
this._dy = 0.0;
}
_updateTransform() {
mat4.identity(this.matrix);
mat4.translate(this.matrix, this.matrix, this.position);
mat4.translate(this.matrix, this.matrix, [
this._dx * BOX_MOTION_RANGE,
-this._value * BOX_SIZE * 0.5,
this._dy * BOX_MOTION_RANGE
]);
mat4.scale(this.matrix, this.matrix, [1.0, 1.05 - this._value, 1.0]);
}
_updateColor() {
let color = null;
if (this._pressed) {
color = [1, 0, 0, 1]; // Red
} else if (this._touched) {
color = [0.1, 0.5, 0.1, 1]; // Dark Green
} else {
color = [0.1, 0.1, 0.1, 1]; // Grey
}
this.renderPrimitive.uniforms.baseColorFactor.value = color;
}
set value(value) {
if (value != this._value) {
this._value = value;
this._updateTransform();
}
}
get value() {
return this._value;
}
set pressed(value) {
if (value != this._pressed) {
this._pressed = value;
this._updateColor();
}
}
get pressed() {
return this._pressed;
}
set touched(value) {
if (value != this._touched) {
this._touched = value;
this._updateColor();
}
}
get touched() {
return this._touched;
}
move(dx, dy) {
this._dx = dx;
this._dy = dy;
this._updateTransform();
}
}
class GamepadBoxSet extends Node {
constructor(buttonCount, axesCount) {
super();
let axesBoxCount = Math.ceil(axesCount / 2);
let rowLength = Math.max(buttonCount, axesBoxCount);
// Place the boxes in a horizontal line
this.buttonBoxes = [];
let hl = (rowLength - 1) * BOX_SEPARATION * 0.5;
for (let x = 0; x < buttonCount; ++x) {
let box = new GamepadBox([(x * BOX_SEPARATION) - hl, BOX_SET_HEIGHT, BOX_SET_DEPTH]);
this.buttonBoxes.push(box);
this.addNode(box);
}
this.axesBoxes = [];
for (let x = 0; x < axesBoxCount; ++x) {
let box = new GamepadBox([(x * BOX_SEPARATION) - hl, BOX_SET_HEIGHT, BOX_SET_DEPTH * 2]);
this.axesBoxes.push(box);
this.addNode(box);
}
}
update_state(gamepad) {
// The boxes associated with any given button will turn green if
// touched and red if pressed. The box height will also scale based
// on the button's value to make it appear like a button being pushed.
for (let i = 0; i < gamepad.buttons.length; ++i) {
this.buttonBoxes[i].pressed = gamepad.buttons[i].pressed;
this.buttonBoxes[i].value = gamepad.buttons[i].value;
this.buttonBoxes[i].touched = gamepad.buttons[i].touched;
}
// Axes are assumed to come in X/Y pairs and will wiggle the
// associated boxes around when moved.
for (let i = 0, j = 0; i < gamepad.axes.length; i+=2, ++j) {
this.axesBoxes[j].move(gamepad.axes[i], i + 1 < gamepad.axes.length ? gamepad.axes[i + 1] : 0);
}
}
}
function updateEqrTransform() {
const orient = quat.create();
quat.fromEuler(orient, eqr_orient.pitch, eqr_orient.yaw, eqr_orient.roll);
eqr_layer.transform = new XRRigidTransform(eqr_pos, {x: orient[0], y: orient[1], z: orient[2], w: orient[3]});
}
function ProcessGamepad(gamepad, hand, pose) {
if (!(hand in boxTable)) {
boxTable[hand] = new GamepadBoxSet(gamepad.buttons.length, gamepad.axes.length);
scene.addNode(boxTable[hand]);
}
boxTable[hand].update_state(gamepad);
if (eqr_layer != null) {
if (hand == "right") {
const tilt = gamepad.axes[3];
const rot = gamepad.axes[2];
// tilt
eqr_orient.pitch = tilt * 90;
eqr_orient.yaw = rot * 90;
updateEqrTransform();
} else if (hand == "left") {
const zoom = gamepad.axes[3];
const horizontal_shift = gamepad.axes[2];
// tilt
eqr_pos.x = horizontal_shift * 4;
eqr_pos.z = zoom * 3;
updateEqrTransform();
}
}
// Update the pose of the boxes to sync with the controller.
if (pose) {
boxTable[hand].matrix = pose.transform.matrix;
}
if ("hapticActuators" in gamepad && gamepad.hapticActuators != null && gamepad.hapticActuators.length > 0) {
for (let j = 0; j < gamepad.buttons.length; ++j) {
if (gamepad.buttons[j].pressed) {
// Vibrate the gamepad using to the value of the button as
// the vibration intensity, normalized to 0.0..1.0 range.
gamepad.hapticActuators[0].pulse((j + 1.0) / (gamepad.buttons.length + 1), 1000);
break;
}
}
}
}
function onRequestSession() {
return navigator.xr.requestSession('immersive-vr',{
requiredFeatures: ['layers']
}).then((session) => {
xrButton.setSession(session);
session.isImmersive = true;
onSessionStarted(session);
});
}
function onVisibilityChange(event) {
console.log("Visibility change for "
+ (event.session.isImmersive? "immersive" : "non-immersive")
+ " session: "
+ event.session.visibilityState);
}
async function onSessionStarted(session) {
session.addEventListener('end', onSessionEnded);
session.addEventListener('visibilitychange', onVisibilityChange);
initGL();
if (session.isImmersive) {
if (stereo_layer.checked) {
number_of_images = 2;
eqr_texture = loadTexture(gl, 'media/textures/chess-pano-4k.jpg', (w,h) => {
eqr_texture_width = w;
eqr_texture_height = h;
onImageLoaded(session);
});
cyl_texture = loadTexture(gl, 'media/textures/stereo-top-bottom-image.png', (w,h) => {
cyl_texture_width = w;
cyl_texture_height = h;
onImageLoaded(session);
});
} else {
number_of_images = 2;
eqr_texture = loadTexture(gl, 'media/textures/mono-equirect180.png ', (w, h) => {
eqr_texture_width = w;
eqr_texture_height = h;
onImageLoaded(session);
});
cyl_texture = loadTexture(gl, 'media/textures/eilenriede-park-2k.png', (w,h) => {
cyl_texture_width = w;
cyl_texture_height = h;
onImageLoaded(session);
});
}
texture_copied = false;
} else {
let glLayer = new XRWebGLLayer(session, gl);
session.updateRenderState({ baseLayer: glLayer });
finalizeSessionStart(session);
}
}
function finalizeSessionStart(session) {
let refSpaceType = session.isImmersive ? 'local' : 'viewer';
session.requestReferenceSpace(refSpaceType).then((refSpace) => {
if (session.isImmersive) {
xrImmersiveRefSpace = refSpace;
// position the cylinder layer
//let cyl_layer = session.renderState.layers[cyl_layer_idx];
//cyl_layer.space = xrImmersiveRefSpace;
let pos = {x: -1.0, y: 0.0, z: -2.0};
let orient = {x:0,y:0,z:0,w:1};
cyl_layer.transform = new XRRigidTransform(pos, orient);
} else {
// In most samples moving forward we'll use this helper class rather
// than the reference space directly to inject the necessary logic
// for looking around an inline session with mouse and touch input.
inlineViewerHelper = new InlineViewerHelper(gl.canvas, refSpace);
}
session.requestAnimationFrame(onXRFrame);
});
}
function eqr_angles_to_bias_scale(eqrlayer, radius, centralHorizontalAngle, upperVerticalAngle, lowerVerticalAngle) {
// converting from equirect2 parameters
//const centralHorizontalAngle = (2.0 * Math.PI) / 3.0;
//const upperVerticalAngle =
// (Math.PI / 2.0) * (2.0 / 3.0); // 60 degrees north latitude
// const float lowerVerticalAngle = -(Math.PI / 2.0) * (2.0 / 3.0); // 60 degrees
// south latitude const float upperVerticalAngle = 0.0f; // equator
eqrlayer.scaleX = (2.0 * Math.PI) / centralHorizontalAngle;
eqrlayer.scaleY = Math.PI / (upperVerticalAngle - lowerVerticalAngle);
eqrlayer.biasX = 0.5 - eqrlayer.scaleX * 0.5;
// the image origin is in the upper left
const upperFrac = 0.5 - (upperVerticalAngle / Math.PI);
eqrlayer.biasY = -eqrlayer.scaleY * upperFrac;
/*
const hemifrac = central_angle / (2.0 * Math.PI);
upper_vert_angle = (upper_vert_angle + Math.PI / 2.0)
lower_vert_angle = (lower_vert_angle + Math.PI / 2.0)
const total_vert_angle = upper_vert_angle + lower_vert_angle;
const upper_vertscale = upper_vert_angle / Math.PI;
const lower_vertscale = lower_vert_angle / Math.PI;
const vert_scale = total_vert_angle / (2.0 * Math.PI);
const vert_offset = upper_vert_angle / total_vert_angle;
let trans1 = mat4.create();
let trans2 = mat4.create();
let scale = mat4.create();
mat4.fromTranslation(trans1, [ -0.5, -vert_offset, 0.0 ]);
mat4.fromTranslation(trans2, [ 0.5, vert_offset, 0.0 ]);
mat4.fromScaling(scale, [hemifrac, vert_scale, 1.0]);
let inv_tex_mat = mat4.create();
mat4.multiply(inv_tex_mat, scale, trans1);
mat4.multiply(inv_tex_mat, trans2, inv_tex_mat);
let tex_mat = mat4.create();
mat4.invert(tex_mat, inv_tex_mat);
let scaling = vec3.create();
mat4.getScaling(scaling, tex_mat);
let trans = vec3.create();
mat4.getTranslation(trans, tex_mat);
eqrlayer.scaleX = scaling[0];
eqrlayer.scaleY = scaling[1];
eqrlayer.biasX = trans[0];
eqrlayer.biasY = trans[1]; */
}
function onImageLoaded(session) {
if (--number_of_images != 0)
return;
xrFramebuffer = gl.createFramebuffer();
xrGLFactory = new XRWebGLBinding(session, gl);
session.requestReferenceSpace('local').then((refSpace) => {
let projlayer = xrGLFactory.createProjectionLayer( {space: refSpace,
depthFormat: do_stencil_buffer.checked?gl.DEPTH24_STENCIL8:gl.DEPTH_COMPONENT24});
let eqrlayer = xrGLFactory.createEquirectLayer( {
space: refSpace,
viewPixelWidth: eqr_texture_width,
viewPixelHeight: eqr_texture_height / (stereo_layer.checked ? 2 : 1),
layout: ((stereo_layer.checked) ? "stereo-top-bottom" : "mono")
});
eqr_angles_to_bias_scale(eqrlayer, 0, Math.PI, Math.PI/2, -Math.PI/2);
// eqr_angles_to_bias_scale(eqrlayer, 4.0, (2.0 * Math.PI) / 3.0, (Math.PI / 2.0) * (2.0 / 3.0), Math.PI / 5);
// eqr_angles_to_bias_scale(eqrlayer, 4.0, (2.0 * Math.PI) / 3.0, (Math.PI / 2.0) * (2.0 / 3.0), 0.0);
//eqr_angles_to_bias_scale(eqrlayer, 4.0, (2.0 * Math.PI) / 3.0, (Math.PI / 2.0) * (2.0 / 3.0), -(Math.PI / 2.0) * (2.0 / 3.0));
console.log("eqrlayer.scaleX = " + eqrlayer.scaleX);
console.log("eqrlayer.scaleY = " + eqrlayer.scaleY);
console.log("eqrlayer.biasX = " + eqrlayer.biasX);
console.log("eqrlayer.biasY = " + eqrlayer.biasY);
// eqrlayer.scaleX = 2;
// eqrlayer.scaleY = 1;
// eqrlayer.biasX = -0.5;
eqrlayer.radius = document.getElementById("radius_txt").value;
cyl_layer = xrGLFactory.createCylinderLayer( {
space: refSpace,
viewPixelWidth: cyl_texture_width,
viewPixelHeight: cyl_texture_height / (stereo_layer.checked ? 2 : 1),
layout: ((stereo_layer.checked) ? "stereo-top-bottom" : "mono")
});
if (change_order.checked) {
session.updateRenderState({ layers: [ eqrlayer, cyl_layer, projlayer ] });
eqr_layer_idx = 0;
cyl_layer_idx = 1;
proj_layer_idx = 2;
} else {
session.updateRenderState({ layers: [ eqrlayer, projlayer, cyl_layer ] });
eqr_layer_idx = 0;
proj_layer_idx = 1;
cyl_layer_idx = 2;
}
finalizeSessionStart(session);
});
}
function onEndSession(session) {
session.end();
}
function onSessionEnded(event) {
if (event.session.isImmersive) {
xrButton.setSession(null);
}
}
function onXRFrame(t, frame) {
let session = frame.session;
let refSpace = session.isImmersive ?
xrImmersiveRefSpace :
inlineViewerHelper.referenceSpace;
let pose = frame.getViewerPose(refSpace);
scene.startFrame();
session.requestAnimationFrame(onXRFrame);
if (session.isImmersive &&
(cyl_layer.needsRedraw || eqr_layer.needsRedraw)) {
texture_copied = false;
}
if (session.isImmersive && !texture_copied) {
eqr_layer = session.renderState.layers[eqr_layer_idx];
proj_layer = session.renderState.layers[proj_layer_idx];
cyl_layer = session.renderState.layers[cyl_layer_idx];
texture_copied = true;
let fb = gl.createFramebuffer();
let glayer = xrGLFactory.getSubImage(eqr_layer, frame);
gl.viewport(0, 0, eqr_texture_width, eqr_texture_height);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, glayer.colorTexture, 0);
gl.disable(gl.SCISSOR_TEST);
gl.clearColor(1, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
stereoUtil.blit(false, eqr_texture, 0, 0, 1, 1, eqr_texture_width, eqr_texture_height);
glayer = xrGLFactory.getSubImage(cyl_layer, frame);
gl.viewport(0, 0, cyl_texture_width, cyl_texture_height);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, glayer.colorTexture, 0);
gl.disable(gl.SCISSOR_TEST);
gl.clearColor(0, 1, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
stereoUtil.blit(false, cyl_texture, 0, 0, 1, 1, cyl_texture_width, cyl_texture_height);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.deleteFramebuffer(fb);
}
if (!session.isImmersive) {
gl.clearColor(0.1, 0.2, 0.3, 1.0);
}
if (pose) {
let glLayer = null;
if (session.isImmersive) {
gl.clearColor(0, 0, 0, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
} else {
glLayer = session.renderState.baseLayer;
gl.bindFramebuffer(gl.FRAMEBUFFER, glLayer.framebuffer);
}
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
// This is a different rendering pattern than the previous samples
// used, but it should be more efficent. It's very common for apps
// being ported to XR to take existing 2D rendering code and call the
// top-level "drawScene" function once per XR view, effectively
// drawing a single eye at a time. However, this causes many state
// changes to be duplicated, which adds to the render loop's overhead.
// By providing the matrices and viewports as an array to the drawing
// function it can do all the necessary binding once and then call the
// actual draw commands in a tighter loop, only changing the matrices
// and viewport each time. This does mean that the viewport is changed
// much more frequently (N times per object instead of N times per
// scene) but it's typically a pretty cheap thing to change and will
// almost always be easily outweighed by the savings from not
// redundantly binding everything else.
// For example, a traditional draw loop would do this:
// Draw(views):
// for each view in views:
// setViewport();
// for each object in scene:
// bindProgram();
// bindMatrices();
// bindUniforms();
// bindBuffers();
// bindTextures();
// draw();
// While this method results in a loop more like this:
// Draw(views):
// for each object in scene:
// bindProgram();
// bindUniforms();
// bindBuffers();
// bindTextures();
// for each view in views:
// setViewport();
// bindMatrices();
// draw();
// Note that for the complexity of the scene in this samples this
// won't make much visible performance difference, but we're using the
// more efficient pattern anyway as a way of promoting best practices.
// Updating cylinder layer every frame
if (update_cylinder_every_frame.checked && session.isImmersive) {
let glayer = xrGLFactory.getSubImage(cyl_layer, frame);
let fb = gl.createFramebuffer();
gl.viewport(0, 0, cyl_texture_width, cyl_texture_height);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, glayer.colorTexture, 0);
gl.disable(gl.SCISSOR_TEST);
gl.clearColor(0, 1, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
stereoUtil.blit(false, cyl_texture, 0, 0, 1, 1, cyl_texture_width, cyl_texture_height);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.deleteFramebuffer(fb);
}
let views = [];
for (let view of pose.views) {
let viewport = null;
if (session.isImmersive) {
glLayer = xrGLFactory.getViewSubImage(proj_layer, view);
glLayer.framebuffer = xrFramebuffer;
viewport = glLayer.viewport;
gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, glLayer.colorTexture, 0);
if (do_stencil_buffer.checked) {
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.TEXTURE_2D, glLayer.depthStencilTexture, 0);
} else {
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, glLayer.depthStencilTexture, 0);
}
} else {
viewport = glLayer.getViewport(view);
}
// Gather all the values needed for one view and push it into the
// array of views to be drawn. WebXRView is a utility class that
// holds all the necessary values for drawing a single view.
// In future samples we'll hide this part away as well by using the
// scene.drawXRViews() function, which handles gathering these
// values internally.
views.push(new WebXRView(view, glLayer, viewport));
}
// Check for and respond to any gamepad state changes.
for (let source of session.inputSources) {
if (source.gamepad) {
let pose = frame.getPose(source.gripSpace, refSpace);
ProcessGamepad(source.gamepad, source.handedness, pose);
}
}
scene.updateInputSources(frame, refSpace);
scene.drawViewArray(views);
}
scene.endFrame();
}
initXR();
</script>
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