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|
<!--
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.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL ReadPixels conformance test.</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/desktop-gl-constants.js"></script>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"> </script>
</head>
<body>
<canvas id="example" width="200" height="200" style="width: 20px; height: 20px"></canvas>
<canvas id="example2" width="200" height="200" style="width: 20px; height: 20px"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description("Checks that ReadPixels works as expected.");
var wtu = WebGLTestUtils;
let gl;
debug("<h1>antialias = false</h1>")
runTest(document.getElementById("example"), false);
debug("<h1>antialias = true</h1>")
runTest(document.getElementById("example2"), true);
finishTest();
var actual;
var expected;
function runTest(canvas, antialias) {
gl = wtu.create3DContext(canvas, {antialias: antialias});
var contextVersion = wtu.getDefault3DContextVersion();
var width = 2;
var height = 2;
var continueTestFunc = continueTestPart1;
gl.clearColor(1, 1, 1, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
// Resize the canvas to 2x2. This is an attempt to get stuff in the backbuffer.
// that shouldn't be there.
canvas.addEventListener("webglcontextlost", function(e) { e.preventDefault(); }, false);
canvas.addEventListener("webglcontextrestored", continueTestAfterContextRestored, false);
canvas.width = width;
canvas.height = height;
if (gl.getError() != gl.CONTEXT_LOST_WEBGL) {
continueTestPart1();
}
function continueTestAfterContextRestored() {
window.gl = wtu.create3DContext(canvas);
var func = continueTestFunc;
window.continueTestFunc = function() { testFailed("should not be here"); };
func();
}
function continueTestPart1() {
gl.clearColor(0.2, 0.6, 0.4, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
var innerColor = [51, 153, 102, 255]; // (0.2, 0.6, 0.4, 1)
var outerColor = [19, 72, 0, 198]; // Random color other than [0, 0, 0, 0]
var tests = [
{ msg: 'in range', checkColor: innerColor, x: 0, y: 0,
oneColor: innerColor, oneX: 0, oneY: 0},
{ msg: 'off top left', checkColor: outerColor, x: -1, y: -1,
oneColor: innerColor, oneX: 1, oneY: 1},
{ msg: 'off bottom right', checkColor: outerColor, x: 1, y: 1,
oneColor: innerColor, oneX: 0, oneY: 0},
{ msg: 'completely off top ', checkColor: outerColor, x: 0, y: -2,
oneColor: outerColor, oneX: 0, oneY: 0},
{ msg: 'completely off bottom', checkColor: outerColor, x: 0, y: 2,
oneColor: outerColor, oneX: 0, oneY: 0},
{ msg: 'completely off left', checkColor: outerColor, x: -2, y: 0,
oneColor: outerColor, oneX: 0, oneY: 0},
{ msg: 'completeley off right', checkColor: outerColor, x: 2, y: 0,
oneColor: outerColor, oneX: 0, oneY: 0}
];
for (var tt = 0; tt < tests.length; ++tt) {
var test = tests[tt];
debug("");
debug("checking: " + test.msg);
checkBuffer(test.checkColor, test.x, test.y,
test.oneColor, test.oneX, test.oneY);
}
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no GL errors");
function checkBuffer(checkColor, x, y, oneColor, oneX, oneY) {
var buf = new Uint8Array(width * height * 4);
// Initialize buf.
for (var ii = 0; ii < width * height; ++ii) {
buf[ii * 4] = outerColor[0];
buf[ii * 4 + 1] = outerColor[1];
buf[ii * 4 + 2] = outerColor[2];
buf[ii * 4 + 3] = outerColor[3];
}
gl.readPixels(x, y, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
for (var yy = 0; yy < height; ++yy) {
for (var xx = 0; xx < width; ++xx) {
var offset = (yy * width + xx) * 4;
var expectedColors = (oneX == xx && oneY == yy) ? oneColor : checkColor;
var mismatch = false;
for (var cc = 0; cc < 4; ++cc) {
var expectedColor = expectedColors[cc];
var color = buf[offset + cc];
var diff = Math.abs(expectedColor - color);
if (diff >= 3) {
mismatch = true;
break;
}
}
assertMsg(!mismatch,
"color pixel at " + xx + ", " + yy + " should be about " + expectedColors +
", was = " + [buf[offset], buf[offset + 1], buf[offset + 2], buf[offset + 3]]);
}
}
}
continueTestPart2();
}
function continueTestPart2() {
let neverValidFormats = [gl.DEPTH_COMPONENT, gl.DEPTH_STENCIL, desktopGL.R8, gl.RGBA4];
let maybeValidFormats = [gl.LUMINANCE, gl.LUMINANCE_ALPHA];
if (contextVersion < 2) {
// They are valid in WebGL 2 or higher
maybeValidFormats = maybeValidFormats.concat([desktopGL.RED, desktopGL.RG_INTEGER, desktopGL.RGBA_INTEGER]);
}
let neverValidTypeInfo = [
{type: desktopGL.UNSIGNED_INT_24_8, dest: new Uint32Array(4)}
];
let maybeValidTypeInfo = [];
if (contextVersion < 2) {
// They are valid in WebGL 2 or Higher
maybeValidTypeInfo = maybeValidTypeInfo.concat([
{type: gl.UNSIGNED_SHORT, dest: new Uint16Array(4)},
{type: gl.SHORT, dest: new Int16Array(4)},
{type: gl.BYTE, dest: new Int8Array(4)},
{type: gl.UNSIGNED_INT, dest: new Uint32Array(4)},
{type: desktopGL.UNSIGNED_INT_2_10_10_10_REV, dest: new Uint32Array(4)}
]);
}
debug("");
debug("check non-default format or type");
for (let format of neverValidFormats) {
var buf = new Uint8Array(4);
gl.readPixels(0, 0, 1, 1, format, gl.UNSIGNED_BYTE, buf);
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "Should not be able to read as " + wtu.glEnumToString(gl, format));
}
for (let format of maybeValidFormats) {
var buf = new Uint8Array(4);
gl.readPixels(0, 0, 1, 1, format, gl.UNSIGNED_BYTE, buf);
wtu.glErrorShouldBe(gl, [gl.INVALID_ENUM, gl.INVALID_OPERATION], "Should not be able to read as " + wtu.glEnumToString(gl, format));
}
for (let info of neverValidTypeInfo) {
var type = info.type;
var dest = info.dest;
gl.readPixels(0, 0, 1, 1, gl.RGBA, type, dest);
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "Should not be able to read as " + wtu.glEnumToString(gl, type));
}
for (let info of maybeValidTypeInfo) {
var type = info.type;
var dest = info.dest;
gl.readPixels(0, 0, 1, 1, gl.RGBA, type, dest);
wtu.glErrorShouldBe(gl, [gl.INVALID_ENUM, gl.INVALID_OPERATION], "Should not be able to read as " + wtu.glEnumToString(gl, type));
}
// -
const combinations = [
{
format: gl.RGB,
type: gl.UNSIGNED_SHORT_5_6_5,
dest: new Uint8Array(3),
},
{
format: gl.RGBA,
type: gl.UNSIGNED_SHORT_5_5_5_1,
dest: new Uint16Array(1),
},
{
format: gl.RGBA,
type: gl.UNSIGNED_SHORT_4_4_4_4,
dest: new Uint16Array(1),
},
];
const FORMATS = [
{
format: gl.RGBA,
channels: 4,
}, {
format: gl.RGB,
channels: 3,
}, {
format: gl.LUMINANCE_ALPHA,
channels: 2,
}, {
format: gl.ALPHA,
channels: 1,
}, {
format: gl.LUMINANCE,
channels: 3,
},
];
if (contextVersion >= 2) {
FORMATS.push(
{
format: gl.RED,
channels: 1,
}, {
format: gl.RG,
channels: 1,
}, {
format: gl.RGBA_INTEGER,
channels: 4,
}, {
format: gl.RGB_INTEGER,
channels: 3,
}, {
format: gl.RG_INTEGER,
channels: 2,
}, {
format: gl.RED_INTEGER,
channels: 1,
}
);
}
// -
const TYPES = [
{
type: gl.UNSIGNED_BYTE,
ctor: Uint8Array,
}, {
type: gl.BYTE,
ctor: Int8Array,
}, {
type: gl.UNSIGNED_SHORT,
ctor: Uint16Array,
}, {
type: gl.SHORT,
ctor: Int16Array,
}, {
type: gl.UNSIGNED_INT,
ctor: Uint32Array,
}, {
type: gl.INT,
ctor: Int32Array,
}, {
type: gl.FLOAT,
ctor: Float32Array,
}
];
if (contextVersion >= 2) {
TYPES.push(
{
type: gl.HALF_FLOAT,
ctor: Uint16Array,
}
);
}
const ext = gl.getExtension('OES_texture_half_float');
if (ext) {
TYPES.push(
{
type: ext.HALF_FLOAT_OES,
ctor: Uint16Array,
}
);
}
for (const t of TYPES) {
for (const f of FORMATS) {
const desc = Object.assign({}, f, t);
desc.dest = new desc.ctor(desc.channels);
combinations.push(desc);
}
}
// -
debug("");
debug("check invalid combinations of format/type");
var implFormat = gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_FORMAT);
var implType = gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_TYPE);
debug("IMPLEMENTATION_COLOR_READ_FORMAT: " + wtu.glEnumToString(gl, implFormat));
debug("IMPLEMENTATION_COLOR_READ_TYPE: " + wtu.glEnumToString(gl, implType));
for (var tt = 0; tt < combinations.length; ++ tt) {
var info = combinations[tt];
var format = info.format;
var type = info.type;
var dest = info.dest;
gl.readPixels(0, 0, 1, 1, format, type, dest);
// Only two format/type parameter pairs are accepted. GL_RGBA/GL_UNSIGNED_BYTE is always
// accepted on default readbuffer. The other acceptable pair can be discovered by querying
// GL_IMPLEMENTATION_COLOR_READ_FORMAT and GL_IMPLEMENTATION_COLOR_READ_TYPE.
if ((format == gl.RGBA && type == gl.UNSIGNED_BYTE) || (format == implFormat && type == implType)) {
wtu.glErrorShouldBe(
gl, gl.NO_ERROR,
"Should be able to read as " + wtu.glEnumToString(gl, format) +
" / " + wtu.glEnumToString(gl, type));
} else {
wtu.glErrorShouldBe(
gl, [gl.INVALID_OPERATION, gl.INVALID_ENUM],
"Should not be able to read as " + wtu.glEnumToString(gl, format) +
" / " + wtu.glEnumToString(gl, type));
}
}
debug("");
debug("check reading with lots of drawing");
continueTestFunc = continueTestPart3;
width = 1024;
height = 1024;
canvas.width = width;
canvas.height = height;
if (gl.getError() != gl.CONTEXT_LOST_WEBGL) {
continueTestPart3();
}
}
function continueTestPart3() {
gl.viewport(0, 0, 1024, 1024);
var program = wtu.setupTexturedQuad(gl);
var loc = gl.getUniformLocation(program, "tex");
gl.disable(gl.BLEND);
gl.disable(gl.DEPTH_TEST);
var colors = [[255, 0, 0, 255], [0, 255, 0, 255], [0, 0, 255, 255]];
var textures = [];
var results = [];
for (var ii = 0; ii < colors.length; ++ii) {
gl.activeTexture(gl.TEXTURE0 + ii);
var tex = gl.createTexture();
wtu.fillTexture(gl, tex, 1, 1, colors[ii]);
textures.push(tex);
}
for (var ii = 0; ii < colors.length; ++ii) {
for (var jj = 0; jj < 300 + ii + 1; ++jj) {
gl.uniform1i(loc, jj % 3);
gl.drawArrays(gl.TRIANGLES, 0, 6);
}
var buf = new Uint8Array(4);
gl.readPixels(512, 512, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, buf);
results.push(buf);
for (var kk = 0; kk < 99; ++kk) {
gl.uniform1i(loc, (jj + kk) % 3);
gl.drawArrays(gl.TRIANGLES, 0, 6);
}
}
for (var ii = 0; ii < colors.length; ++ii) {
var buf = results[ii];
var color = colors[ii];
actual = [buf[0], buf[1], buf[2], buf[3]];
expected = [color[0], color[1], color[2], color[3]];
shouldBe("actual", "expected");
}
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no GL errors");
debug("");
debug("check readback into Uint8ClampedArray");
continueTestFunc = continueTestPart4;
const kSize = 32;
canvas.width = kSize;
canvas.height = kSize;
if (gl.getError() != gl.CONTEXT_LOST_WEBGL) {
continueTestPart4();
}
}
function continueTestPart4() {
const kSize = 32;
gl.viewport(0, 0, kSize, kSize);
gl.clearColor(0.0, 1.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
var buf = new Uint8ClampedArray(4);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, buf);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no GL errors reading back into a Uint8ClampedArray");
if (buf[0] == 0 && buf[1] == 255 && buf[2] == 0 && buf[3] == 255) {
testPassed("Readback into Uint8ClampedArray worked successfully");
} else {
assertMsg(false,
"color pixel at 0, 0 should be [0, 255, 0, 255], was " +
[buf[0], buf[1], buf[2], buf[3]]);
}
const validDatas = [
`new Uint8Array(4)`,
`new Uint8Array(new ArrayBuffer(4))`,
`new Uint8ClampedArray(4)`,
`new Uint8ClampedArray(new ArrayBuffer(4))`,
];
if (window.SharedArrayBuffer) {
validDatas.push(
`new Uint8Array(new SharedArrayBuffer(4))`,
`new Uint8ClampedArray(new SharedArrayBuffer(4))`
);
}
for (const x of validDatas) {
shouldNotThrow(`gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, ${x});`);
}
}
}
</script>
</body>
</html>
|
