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|
<!DOCTYPE html><meta charset="utf-8">
<meta name=viewport content="width=900">
<title>WebGL workload simulator</title>
<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->
<style>
body {
margin: 0;
font-family: monospace;
user-select: none;
-moz-user-select: -moz-none;
-webkit-user-select: none;
font-size: 22px;
text-size-adjust: none;
}
pre { margin: 0; }
.square img { position: relative; }
.square {
overflow: hidden;
border-bottom: 20px solid black;
border-right: 20px solid black;
display: block;
}
#fpsSpan { font-size: 30px; }
#fpsPanel {
position: fixed;
text-align: right;
left: 550px;
top: 0px;
width: 300px;
font-size: 12px;
margin: 10px;
pointer-events: none;
}
input, label { white-space: pre; pointer-events: auto; }
input { margin: 15px 15px; transform: scale(2); }
input[type="number"] { width: 50px; }
input[type="range"] {
width: 100px;
margin: 30px 200px;
padding: 0px;
transform: scale(4);
}
.rotate { animation: rotating 2s linear infinite; }
@keyframes rotating {
from { transform: scale(2) rotate(0deg); }
to { transform: scale(2) rotate(360deg); }
}
.bad { color: red; }
.light { color: #CCCCCC; }
#warning {
color: #FF0000;
}
</style>
<canvas id=webglCanvas class=square></canvas>
<canvas id=canvas class=square style=display:none;></canvas>
<div id=dom class=square style=display:none;background:white>
<img id=img style=width:256px;height:256px;background:black></img>
</div>
<div style=margin:2em;margin-top:0>
<div id=warning></div>
Drag the WebGL logo.<br>
<label for=useGl>Renderer: <input type=radio name=renderer id=useGl checked>WebGL</label>
<label for=use2D><input type=radio name=renderer id=use2D>Canvas 2D</label>
<label for=useDom><input type=radio name=renderer id=useDom>DOM</label>
<br>
<label for=animate><input type=checkbox name=animate id=animate>Animate</label>
<span id=continuousOptions>
<label for=useRaf><input type=radio name=loop id=useRaf checked>requestAnimationFrame</label>
<label for=usePostMessage><input type=radio name=loop id=usePostMessage>postMessage</label>
<label for=useSetTimeout><input type=radio name=loop id=useSetTimeout>setTimeout</label>
<label for=useSetInterval><input type=radio name=loop id=useSetInterval>setInterval</label>
<br>
<div id=fpsOptions>
<input id=fpsSlider type=range min=10 max=240 step=10 value=60>
Target FPS: <span id=fpsLabel>60</span>
</div>
</span>
<details id=canvasOptions>
<summary>Canvas options</summary>
<div id=canvas2DOptions>
Canvas size <input type=number id=canvasSize value=512 min=1> pixels<sup>2</sup>
<label for=onscreen><input type=radio name=offscreen id=onscreen checked>Regular canvas</label>
<label for=offscreen><input type=radio name=offscreen id=offscreen>OffscreenCanvas (on main thread)</label>
<!-- <label for=offscreenWorker><input type=radio name=offscreen id=offscreenWorker>OffscreenCanvas on worker</label> -->
<br>
<label for=transferControlToOffscreen><input type=checkbox id=transferControlToOffscreen checked>Use transferControlToOffscreen</label>
</div>
</details>
<div id=glOptions>
<details id=glWork>
<summary>WebGL rendering work</summary>
<div id=pixelsWrapper>
<input type=range id=pixels min=65536 max=65536000 value=65536 step=65536>
draw <span id=pixelsLabel>64K</span> pixels per view
</div>
<input type=range id=drawCalls min=0 max=10000 value=0 step=10>
using <span id=drawCallsLabel>1</span> draw call(s) per view
<br>
Multiply the above slider values by:
<label for=x1><input type=radio name=multiplier id=x1 checked>1 </label>
<label for=x10><input type=radio name=multiplier id=x10>10 </label>
<label for=x100><input type=radio name=multiplier id=x100>100 </label>
<br>
<input type=range id=uploads min=0 max=256 value=0 step=0.25>
<span id=uploadLabel>0.00</span> MB glBufferData
<br>
<label for=finish><input type=checkbox id=finish>glFinish</label>
<br>
<label for=readPixels><input type=checkbox id=readPixels>glReadPixels</label>
</details>
<details id=contextCreation>
<summary>WebGL context creation options</summary>
<label for=useWebGL2><input type=checkbox id=useWebGL2 checked>Use WebGL 2 if available</label>
<label for=antialias><input type=checkbox id=antialias checked>Antialias</label>
<label for=alpha><input type=checkbox id=alpha checked>Alpha</label>
<label for=depth><input type=checkbox id=depth checked>Depth</label>
<label for=stencil><input type=checkbox id=stencil>Stencil</label>
<label for=premultipliedAlpha><input type=checkbox id=premultipliedAlpha checked>Premultiplied Alpha</label>
<label for=preserveDrawingBuffer><input type=checkbox id=preserveDrawingBuffer>Preserve Drawing Buffer</label>
<label for=desynchronized><input type=checkbox id=desynchronized>Desynchronized</label>
<br>
Power preference
<label for=ppDefault><input type=radio name=pp id=ppDefault checked>default</label>
<label for=lowPower><input type=radio name=pp id=lowPower>low-power</label>
<label for=highPerformance><input type=radio name=pp id=highPerformance>high-performance</label>
<br>
<label for=separateHighPowerContext><input type=checkbox id=separateHighPowerContext>Activate high power GPU (by creating a separate high power context)</label>
</details>
<div id=multiviewOptions>
<input type=range id=views min=1 max=4 value=0 step=1>
Draw <span id=viewsLabel>1</span> views(s)
<br>
<label for=multiview><input type=checkbox id=multiview>Use OVR_multiview2</label>
<label for=multiviewCopy><input type=checkbox id=multiviewCopy checked>Copy multiview draw results to main canvas</label>
</div>
<pre id=contextVersion>
</pre>
<details id=contextAttributes>
<summary>Context attributes</summary>
<pre></pre>
</details>
<details id=supportedExtensions>
<summary>Supported Extensions</summary>
</details>
</div>
<br>
<input type=range id=jsWork min=0 max=100 value=0>
<span id=jsWorkLabel>0</span> ms extra Javascript work per frame
<br>
<label for=animation><input type=checkbox id=animation>CSS animation</label>
<div id=fpsPanel>
<label for=showFps><input type=checkbox id=showFps checked>Show FPS</label>
<div id=fps>
<span id=fpsSpan></span>
<p>
<label for=showStats><input type=checkbox id=showStats>More info</label>
<div id=stats></div>
</div>
</div>
<iframe id=highPowerFrame style=display:none></iframe>
<h2><center>WebGL workload simulator</center></h2>
</div>
<script>
'use strict';
// Add all elements with ids as global readonly variables.
for (let element of document.documentElement.querySelectorAll('[id]'))
Object.defineProperty(this, element.id, {value: element, writeable: false});
/************\
* Options UI *
\************/
// Set all input elements with values from the query string.
const controls = document.querySelectorAll('input, details');
const defaultChecked = {};
const defaultValues = {};
const defaultMaxes = {};
for (const control of controls) {
if (!control.id) continue;
defaultChecked[control.id] = control.checked;
defaultValues[control.id] = control.value;
defaultMaxes[control.id] = control.max;
const param = window.location.search.match(control.id + '(?:=([^&]*))?');
if (param) {
if (control.type == 'radio')
control.checked = true;
else if (control.type == 'checkbox')
control.checked = param[1] != 'false';
else if (control instanceof HTMLDetailsElement)
control.open = true;
else
control.value = param[1];
}
control.oninput = updateControls;
if (control instanceof HTMLDetailsElement)
control.onclick = ()=>setTimeout(updateControls, 0);
}
// Some controls require a page reload when changed.
const reloadControls = ['useWebGL2', 'antialias', 'alpha', 'depth', 'stencil', 'premultipliedAlpha', 'preserveDrawingBuffer', 'desynchronized', 'ppDefault', 'lowPower', 'highPerformance', 'canvasSize', 'onscreen', 'offscreen', 'transferControlToOffscreen'].map(x=>window[x]);
for (let control of reloadControls) {
control.onchange = ()=>{
updateControls();
callReplaceStateThrottled();
location.reload();
};
}
separateHighPowerContext.onchange = ()=>{
if (!separateHighPowerContext.checked)
highPowerFrame.contentDocument.location.reload();
else {
const doc = highPowerFrame.contentDocument;
const canvas = doc.createElement('canvas');
doc.body.appendChild(canvas);
canvas.getContext('webgl', {powerPreference: 'high-performance'});
}
}
separateHighPowerContext.onchange();
let queryString = window.location.search;
let previousQueryString = queryString;
let replaceStateScheduled = false;
function callReplaceStateThrottled() {
replaceStateScheduled = false;
if (queryString == previousQueryString)
return;
previousQueryString = queryString;
let path = window.location.pathname;
history.replaceState(null, null, queryString == '?' ? path : path + queryString);
}
const suffixes = ['', 'K', 'M', 'G', 'E']
const divisors = [];
for (let i = 0; i < suffixes.length; i++)
divisors[i] = Math.pow(10, i * 3);
const formatSI = (x) => {
const order = Math.min(Math.log10(Math.abs(x)) / 3 | 0, suffixes.length);
return (x / divisors[order]).toFixed(1) + suffixes[order];
}
var multiplier;
function updateControls() {
multiplier = x1.checked ? 1 : x10.checked ? 10 : 100;
webglCanvas.style.display = useGl.checked ? 'block' : 'none';
canvas.style.display = use2D.checked ? 'block' : 'none';
dom.style.display = useDom.checked ? 'block' : 'none';
animation.className = animation.checked ? 'rotate' : null;
canvasOptions.style.display = useDom.checked ? 'none' : '';
transferControlToOffscreen.parentElement.style.display = onscreen.checked ? 'none' : '';
continuousOptions.style.display = animate.checked ? '' : 'none';
glOptions.style.display = useGl.checked ? '' : 'none';
multiviewOptions.style.display = (useGl.checked && multiviewAvailable) ? '' : 'none';
fpsOptions.style.display =
animate.checked && (useSetTimeout.checked || useSetInterval.checked) ?
'' : 'none';
fps.style.visibility = showFps.checked ? 'visible' : 'hidden';
stats.style.visibility = showStats.checked ? 'visible' : 'hidden';
drawCallsLabel.textContent = Math.max(1, drawCalls.value * multiplier);
pixelsLabel.textContent = formatSI(pixels.value * multiplier);
jsWorkLabel.textContent = jsWork.value;
fpsLabel.textContent = fpsSlider.value;
uploadLabel.textContent =
parseFloat(uploads.value).toFixed(2);
viewsLabel.textContent = views.value;
// Multiview is currently incompatible with multisampling.
if ((views.value > 1 || multiview.checked) && antialias.checked)
antialias.click();
const queryParams = [];
for (const control of controls) {
if (control.type == 'radio') {
if (!defaultChecked[control.id] && control.checked)
queryParams.push(control.id);
} else if (control.type == 'checkbox') {
if (control.checked != defaultChecked[control.id])
queryParams.push(defaultChecked[control.id] ? control.id + '=' + control.checked : control.id);
} else if (control instanceof HTMLDetailsElement) {
if (control.open)
queryParams.push(control.id);
} else if (control.value != defaultValues[control.id]) {
queryParams.push(control.id + '=' + control.value);
}
}
queryString = '?' + queryParams.join('&');
if (!replaceStateScheduled) {
replaceStateScheduled = true;
setTimeout(callReplaceStateThrottled, 200);
}
render();
};
/**********************\
* Input event handling *
\**********************/
const imgSize = 256;
const size = parseInt(canvasSize.value);
let multiviewAvailable = false;
let webglVersion;
let mouseDown = false;
const lastPos = [0, 0];
document.onmouseup = (e) => { mouseDown = false; }
document.onmousedown = (e) => {
mouseDown = true;
lastPos[0] = e.pageX;
lastPos[1] = e.pageY;
};
document.ontouchstart = (e) => {
lastPos[0] = e.touches[0].pageX;
lastPos[1] = e.touches[0].pageY;
}
const position = [(size - imgSize) / 2, (size - imgSize) / 2];
let continuousRunning = false;
let mouseUpdatesThisFrame = 0;
function mouseMove(e) {
mouseUpdatesThisFrame++;
countFps("mouse/touchmove event");
const xy = [0, 0];
if (e.touches) {
xy[0] = e.touches[0].pageX;
xy[1] = e.touches[0].pageY;
} else {
xy[0] = e.pageX;
xy[1] = e.pageY;
}
if (e.touches || mouseDown) {
for (let i = 0; i < 2; ++i) {
position[i] += xy[i] - lastPos[i];
position[i] = Math.max(0, Math.min(size - imgSize, position[i]));
lastPos[i] = xy[i];
}
if (!continuousRunning) {
render();
}
}
}
document.addEventListener("mousemove", mouseMove, true);
document.body.addEventListener("touchmove", mouseMove, true);
for (const element of [dom, canvas, webglCanvas, img])
element.onmousedown = element.ontouchstart = (e)=>e.preventDefault();
/***********\
* Rendering *
\***********/
webglCanvas.width = webglCanvas.height = canvas.width = canvas.height = size;
dom.style.width = dom.style.height = size + 'px';
window.onmessage = () => render(false, true);
let ctx;
let bitmapRenderer;
let offscreenCanvas;
let gl;
let glBitmapRenderer;
let glOffscreenCanvas;
let program;
let buffer;
const borderSize = 10;
const vertices = [0, 0, 1, 0, 0, 1, 1, 1];
const readPixelsArray = new Uint8Array(4);
let writeBufferArray = new Float32Array(0);
let interval;
let intervalFps;
let timeout = null;
let rafPending = 0;
let postMessagePending = 0;
let maxViewsMultiview = 2;
let multiviewProgram = [];
let multiviewExt = null;
let multiviewTexture = null;
let multiviewFramebuffer = null;
let viewFramebuffer = [];
let lastNumViews = 0;
let displayedWarningText = '';
let warningText = '';
const animationDirection = [1, -1];
function render(fromRaf, fromPostMessage) {
if (fromRaf) rafPending--;
if (fromPostMessage) postMessagePending--;
// Set up the appropriate render loop callback as specified by the UI, if
// continuous rendering is enabled.
continuousRunning = animate.checked;
if (continuousRunning) {
for (let i = 0; i < 2; ++i) {
position[i] += animationDirection[i] * 2;
if (position[i] > size - imgSize) {
position[i] = size - imgSize;
animationDirection[i] = -1;
}
if (position[i] < 0) {
position[i] = 0;
animationDirection[i] = 1;
}
}
if (useRaf.checked && rafPending == 0) {
(window.requestAnimationFrame || window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame)(function() { render(true); });
rafPending++;
}
if (useSetTimeout.checked) {
clearTimeout(timeout);
timeout = setTimeout(render, 1 / fpsSlider.value * 1000);
}
if (useSetInterval.checked) {
if (!interval || intervalFps != fpsSlider.value) {
clearInterval(interval);
intervalFps = fpsSlider.value;
interval = setInterval(render, 1 / fpsSlider.value * 1000);
}
} else {
clearInterval(interval);
interval = null;
}
if (usePostMessage.checked) {
if (postMessagePending == 0) {
++postMessagePending;
window.postMessage('', '*');
}
}
} else {
clearInterval(interval);
interval = null;
}
countFps("render", mouseUpdatesThisFrame);
mouseUpdatesThisFrame = 0;
// Busy wait for a configurable amount of time.
const startMs = Date.now();
while (Date.now() - startMs < jsWork.value);
warningText = '';
// Initialize GL.
if (!gl) {
const options = {};
for (let option of ['antialias', 'alpha', 'depth', 'stencil', 'premultipliedAlpha', 'preserveDrawingBuffer', 'desynchronized'])
options[option] = window[option].checked;
options.powerPreference = ppDefault.checked ? 'default' : lowPower.checked ? 'low-power' : 'high-performance';
let renderCanvas = webglCanvas;
if (offscreen.checked) {
if (transferControlToOffscreen.checked) {
renderCanvas = webglCanvas.transferControlToOffscreen();
} else {
glBitmapRenderer = webglCanvas.getContext('bitmaprenderer')
renderCanvas = glOffscreenCanvas = new OffscreenCanvas(size, size);
}
}
renderCanvas.width = renderCanvas.height = size;
if (useWebGL2.checked)
gl = renderCanvas.getContext('webgl2', options);
if (gl) {
webglVersion = 2;
} else {
webglVersion = 1;
gl = renderCanvas.getContext('webgl', options);
const aia = gl.getExtension('ANGLE_instanced_arrays');
if (aia)
gl.drawArraysInstanced = (a, b, c, d)=>aia.drawArraysInstancedANGLE(a, b, c, d);
else {
pixels.value = pixels.min;
pixelsWrapper.style.display = 'none';
gl.drawArraysInstanced = (a, b, c, d)=>gl.drawArrays(a, b, c);
}
}
// Read context info like renderer string and extensions.
let renderer = gl.getParameter(gl.RENDERER);
let debugRendererInfo = gl.getExtension('WEBGL_debug_renderer_info');
if (debugRendererInfo)
renderer = gl.getParameter(debugRendererInfo.UNMASKED_RENDERER_WEBGL);
contextVersion.textContent = `WebGL Version: ${gl.getParameter(gl.VERSION)}\nRenderer: `;
const a = document.createElement('a');
a.textContent = renderer;
a.href = `https://www.google.com/search?q=${encodeURIComponent(renderer)}`
contextVersion.appendChild(a);
contextAttributes.getElementsByTagName('pre')[0].textContent = JSON.stringify(gl.getContextAttributes(), 0, 2);
for (const e of gl.getSupportedExtensions()) {
const a = document.createElement('a');
a.textContent = e;
a.href = `https://www.khronos.org/registry/webgl/extensions/${e}/`;
supportedExtensions.appendChild(a);
supportedExtensions.appendChild(document.createElement('br'));
}
// Setup texture
const tex = gl.createTexture();
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array([0, 0, 0, 255]));
img.onload = ()=>{
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img);
gl.generateMipmap(gl.TEXTURE_2D);
render();
};
function setupProgram(vsSource, fsSource, attribs, uniforms) {
let prog = gl.createProgram();
function compileShader(source, type) {
const shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS))
console.log(gl.getShaderInfoLog(shader));
gl.attachShader(prog, shader);
}
compileShader(vsSource, gl.VERTEX_SHADER);
compileShader(fsSource, gl.FRAGMENT_SHADER);
for (let i = 0; i < attribs.length; ++i)
gl.bindAttribLocation(prog, i, attribs[i]);
gl.linkProgram(prog);
if (!gl.getProgramParameter(prog, gl.LINK_STATUS))
console.log(gl.getProgramInfoLog(prog));
for (const attrib of attribs)
prog[attrib] = gl.getAttribLocation(prog, attrib);
for (const uniform of uniforms)
prog[uniform] = gl.getUniformLocation(prog, uniform);
return prog;
}
program = setupProgram(`
attribute vec2 position;
varying vec2 texCoord;
uniform vec2 offset;
uniform float size;
void main() {
gl_Position = vec4(position * size + offset + vec2(size - 1., 1. - size), 0, 1);
texCoord = vec2(position.x, 1. - position.y);
}`,`
precision mediump float;
varying vec2 texCoord;
uniform vec4 colorAddition;
uniform sampler2D tex;
void main() {
gl_FragColor = texture2D(tex, texCoord) + colorAddition * 0.5;
}`,
['position', 'texCoordIn'], ['offset', 'tex', 'size', 'colorAddition']);
gl.useProgram(program);
gl.uniform1i(program.tex, 0);
if (webglVersion >= 2 && gl.getExtension('OVR_multiview2')) {
multiviewAvailable = true;
let ext = gl.getExtension('OVR_multiview2')
maxViewsMultiview = Math.min(gl.getParameter(ext.MAX_VIEWS_OVR), 16);
views.max = maxViewsMultiview;
for (let i = 0; i < maxViewsMultiview; ++i) {
multiviewProgram[i] = setupProgram(`#version 300 es
#extension GL_OVR_multiview2 : enable
layout(num_views=${i + 1}) in;
in vec2 position;
out vec2 texCoord;
uniform vec2 offset;
uniform float size;
void main() {
gl_Position = vec4(position * size + offset + vec2(size - 1., 1. - size), 0, 1);
texCoord = vec2(position.x, 1. - position.y);
}`, `#version 300 es
#extension GL_OVR_multiview2 : enable
precision mediump float;
in vec2 texCoord;
out vec4 my_FragColor;
uniform sampler2D tex;
void main() {
vec4 colorAddition = vec4(((gl_ViewID_OVR & 0x4u) != 0u) ? 1.0 : 0.0,
((gl_ViewID_OVR & 0x2u) != 0u) ? 1.0 : 0.0,
((gl_ViewID_OVR & 0x1u) != 0u) ? 1.0 : 0.0,
1.0);
my_FragColor = texture(tex, texCoord) + colorAddition * 0.5;
}`,
['position', 'texCoordIn'], ['offset', 'tex', 'size']);
gl.useProgram(multiviewProgram[i]);
gl.uniform1i(multiviewProgram[i].tex, 0);
}
}
// Setup vertex buffer
buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STREAM_DRAW);
gl.enableVertexAttribArray(program.position);
gl.vertexAttribPointer(program.position, 2, gl.FLOAT, false, 0, 0);
// Setup drawing state
gl.viewport(0, 0, size, size);
gl.clearColor(1, 1, 1, 1);
gl.disable(gl.SCISSOR_TEST);
gl.disable(gl.DEPTH_TEST);
gl.disable(gl.STENCIL_TEST);
gl.disable(gl.BLEND);
gl.disable(gl.CULL_FACE);
updateControls();
} // End GL init
if (useDom.checked) {
img.style.left = position[0] + 'px';
img.style.top = position[1] + 'px';
return;
}
if (use2D.checked) {
if (!ctx) {
if (offscreen.checked) {
if (transferControlToOffscreen.checked) {
offscreenCanvas = canvas.transferControlToOffscreen();
} else {
bitmapRenderer = canvas.getContext('bitmaprenderer');
offscreenCanvas = new OffscreenCanvas(size, size);
}
ctx = offscreenCanvas.getContext('2d');
} else {
ctx = canvas.getContext('2d');
}
}
ctx.fillStyle = 'white';
ctx.fillRect(0, 0, canvas.width, canvas.height);
try {
ctx.drawImage(img, position[0], position[1]);
} catch (e) {
ctx.fillStyle = 'black';
ctx.fillRect(position[0], position[1], imgSize, imgSize);
}
if (offscreen.checked && !transferControlToOffscreen.checked && bitmapRenderer && offscreenCanvas) {
bitmapRenderer.transferFromImageBitmap(offscreenCanvas.transferToImageBitmap());
}
return;
}
// Upload some data to test the PCI bottleneck.
if (uploads.value > 0) {
if (writeBufferArray.length * 4 != uploads.value * 1024 * 1024) {
writeBufferArray = new Float32Array(uploads.value * 1024 * 1024 / 4);
// We want to actually use this data in rendering so the graphics driver
// can't optimize away the upload. Fill the first few bytes with our real
// vertex data.
writeBufferArray.set(vertices, 0);
}
gl.bufferData(gl.ARRAY_BUFFER, writeBufferArray, gl.STREAM_DRAW);
}
// Actually draw the map.
const numDrawCalls = Math.max(1, drawCalls.value * multiplier);
const numViews = multiviewAvailable ? Math.min(views.value, maxViewsMultiview) : 1;
const instances = pixels.value / 64000 * multiplier;
const instancesPerCall = Math.max(1, instances / numDrawCalls | 0);
const instancesFirstCall = instancesPerCall + numDrawCalls % instancesPerCall;
// Set up to scissor out all but one pixel of the map.
gl.scissor(position[0], size - position[1] - 1, 1, 1);
if (multiviewAvailable && (multiview.checked || numViews > 1) && !multiviewFramebuffer) {
multiviewTexture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D_ARRAY, multiviewTexture);
gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, size, size, maxViewsMultiview);
multiviewExt = gl.getExtension('OVR_multiview2');
multiviewFramebuffer = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, multiviewFramebuffer);
multiviewExt.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, multiviewTexture, 0, 0, numViews);
lastNumViews = numViews;
for (let i = 0; i < maxViewsMultiview; ++i) {
viewFramebuffer[i] = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, viewFramebuffer[i]);
gl.framebufferTextureLayer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, multiviewTexture, 0, i);
}
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.bindTexture(gl.TEXTURE_2D_ARRAY, null);
}
let usedProgram = program;
if (multiviewAvailable && multiview.checked) {
gl.bindFramebuffer(gl.FRAMEBUFFER, multiviewFramebuffer);
if (numViews != lastNumViews) {
multiviewExt.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, multiviewTexture, 0, 0, numViews);
lastNumViews = numViews;
}
usedProgram = multiviewProgram[numViews - 1];
} else {
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
}
gl.useProgram(usedProgram);
gl.uniform2f(usedProgram.offset,
(position[0] - imgSize) / size * 2,
-position[1] / size * 2);
gl.uniform1f(usedProgram.size, imgSize * 2 / size);
if (usedProgram == program) {
gl.uniform4f(program.colorAddition, 0.0, 0.0, 0.0, 1.0);
}
for (let viewIndex = 0; viewIndex < numViews; ++viewIndex) {
let scissorEnabled = false;
if (multiviewAvailable && !multiview.checked && numViews > 1) {
gl.bindFramebuffer(gl.FRAMEBUFFER, viewFramebuffer[viewIndex]);
gl.uniform4f(program.colorAddition, (viewIndex & 4) ? 1.0 : 0.0, (viewIndex & 2) ? 1.0 : 0.0, (viewIndex & 1) ? 1.0 : 0.0, 1.0);
gl.disable(gl.SCISSOR_TEST);
}
gl.clearColor(1, 1, 1, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.drawArraysInstanced(gl.TRIANGLE_STRIP, 0, 4, instancesFirstCall);
var instancesDrawn = instancesFirstCall;
for (let i = 1; i < numDrawCalls; i++) {
if (instancesDrawn > instances && !scissorEnabled) {
// If we've drawn all of the requested pixels already, enable the scissor
// test so we only draw one pixel per draw call for the rest of the calls.
scissorEnabled = true;
gl.enable(gl.SCISSOR_TEST);
}
gl.drawArraysInstanced(gl.TRIANGLE_STRIP, 0, 4, instancesPerCall);
instancesDrawn += instancesPerCall;
}
if (multiviewAvailable && multiview.checked) {
break;
}
}
gl.disable(gl.SCISSOR_TEST);
if (multiviewAvailable && (multiview.checked || numViews > 1)) {
if (multiviewCopy.checked) {
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
gl.clearColor(1, 1, 1, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
let gridCellsPerRow = Math.ceil(Math.sqrt(numViews));
for (let i = 0; i < numViews; ++i) {
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, viewFramebuffer[i]);
let x = i % gridCellsPerRow;
let y = Math.floor(i / gridCellsPerRow);
x *= size / gridCellsPerRow;
y *= size / gridCellsPerRow;
gl.blitFramebuffer(0, 0, size, size, x, y, x + size / gridCellsPerRow, y + size / gridCellsPerRow, gl.COLOR_BUFFER_BIT, gl.NEAREST);
}
} else {
warningText = 'NOTE: Offscreen multiview rendering active - rendering not copied to canvas';
}
}
if (finish.checked) {
gl.finish();
}
if (readPixels.checked) {
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, readPixelsArray);
}
if (offscreen.checked && !transferControlToOffscreen.checked && glOffscreenCanvas && glBitmapRenderer) {
glBitmapRenderer.transferFromImageBitmap(glOffscreenCanvas.transferToImageBitmap());
}
}
/**************\
* FPS counters *
\**************/
const counters = {};
function countFps(name, mouseEventsThisFrame) {
let counter = counters[name];
if (!counter) {
counter = { history: [Date.now() - 16], name: name, count: 0 };
counters[name] = counter;
}
const history = counter.history;
history.push(Date.now());
while (history.length > 2 &&
history[0] + 1000 < history[history.length - 1]) {
counter.history.shift();
}
let averageMs = 0;
let maxMs = .1;
let minMs = 99999999;
for (let i = 1; i < history.length; i++) {
let diff = history[i] - history[i - 1];
averageMs += diff;
maxMs = Math.max(maxMs, diff);
minMs = Math.min(minMs, diff);
}
averageMs /= history.length - 1;
counter.fps = 1000 / averageMs;
counter.minFps = 1000 / maxMs;
counter.maxFps = 1000 / minMs;
counter.count++;
if (mouseEventsThisFrame !== undefined) {
counter.mouseEvents = counter.mouseEvents || { multiple: 0, zero: 0 };
if (mouseEventsThisFrame > 1) {
counter.mouseEvents.multiple++;
} else if (mouseEventsThisFrame == 0) {
counter.mouseEvents.zero++;
}
}
if (showFps.checked) {
fpsSpan.innerText = counters['render'].fps.toFixed();
if (showStats.checked) {
let text = "";
for (let key in counters) {
counter = counters[key];
text += "<b>" + counter.name + "</b><br>";
text += counter.fps.toFixed() + " avg FPS<br>";
text += "<div class=" +
(counter.maxFps - counter.fps > 10 ? "bad" : "") + ">" +
counter.maxFps.toFixed() + " max FPS</div>";
text += "<div class=" +
(counter.fps - counter.minFps > 10 ? "bad" : "") + ">" +
counter.minFps.toFixed() + " min FPS</div>";
if (counter.mouseEvents) {
text += "<div>" + counter.mouseEvents.zero +
" frame(s) with no mouse/touch events";
text += "<div>" + counter.mouseEvents.multiple +
" frame(s) with multiple mouse/touch events";
}
text += "<div class=light>" + counter.count + " frames</div>";
}
stats.innerHTML = text;
}
}
if (warningText != displayedWarningText) {
warning.textContent = warningText;
displayedWarningText = warningText;
}
}
updateControls();
img.src = 'data:image/png;base64,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';
</script>
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