tex-sub-image-2d.html

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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.

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<link rel="stylesheet" href="../../../resources/js-test-style.css"/>

<script src="../../../js/js-test-pre.js"></script>

<script src="../../../js/webgl-test-utils.js"></script>

<script id="fshader" type="x-shader/x-fragment">

precision mediump float;

uniform sampler2D tex;

varying vec2 texCoord;

void main()

    float intensity = texture2D(tex, texCoord).a;

    gl_FragColor = vec4(intensity, intensity, intensity, 1.0);

</script>

</head>

<body>

<canvas id="example" width="256" height="1"></canvas>

<div id="description"></div>

<div id="console"></div>

<script>

"use strict";

description('Tests texSubImage2D upload path from Uint8Array');

var wtu = WebGLTestUtils;

var canvas = document.getElementById("example");

var gl = wtu.create3DContext(canvas);

gl.disable(gl.DITHER);

var program = wtu.setupProgram(

gl,

    [wtu.simpleTextureVertexShader, "fshader"],

    ['vPosition', 'texCoord0']);

wtu.setupUnitQuad(gl);

var textureWidth = 256;

var textureHeight = 1;

var textureLoc = gl.getUniformLocation(program, "tex");

var texture = gl.createTexture();

gl.bindTexture(gl.TEXTURE_2D, texture);

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.NEAREST);

gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);

// Allocate the texture object

gl.texImage2D(gl.TEXTURE_2D, 0, gl.ALPHA, textureWidth, textureHeight, 0, gl.ALPHA, gl.UNSIGNED_BYTE, null);

// Prepare the image data

var array = new Uint8Array(textureWidth);

for (var i = 0; i < textureWidth; i++)

    array[i] = i;

// Fill the texture object with data -- this is actually the code path being tested

gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, textureWidth, textureHeight, gl.ALPHA, gl.UNSIGNED_BYTE, array);

// Clear and set up

gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

gl.bindTexture(gl.TEXTURE_2D, texture);

gl.useProgram(program);

gl.uniform1i(textureLoc, 0);

// Draw the texture to the frame buffer

gl.drawArrays(gl.TRIANGLES, 0, 6);

// Read back the frame buffer

var buf = new Uint8Array(textureWidth * textureHeight * 4);

gl.readPixels(0, 0, textureWidth, textureHeight, gl.RGBA, gl.UNSIGNED_BYTE, buf);

// Verify the frame buffer's contents

var passed = true;

for (var i = 0; i < textureWidth; i++) {

    var val = i;

    if (buf[4 * i + 0] != val ||

        buf[4 * i + 1] != val ||

        buf[4 * i + 2] != val) {

        testFailed("pixel at (" + i + ", 0) was (" +

                   buf[4 * i + 0] + ", " +

                   buf[4 * i + 1] + ", " +

                   buf[4 * i + 2] + "), should be (" +

                   val + ", " + val + ", " + val + ")");

        passed = false;

        break;

if (passed)

    testPassed("");

var successfullyParsed = true;

</script>

<script src="../../../js/js-test-post.js"></script>

</body>

</html>