state-uneffected-after-compositing.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">

<title>WebGL: Check that state is not lost by compositing</title>

<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>

</head>

<body>

<canvas id="testbed" width="16" height="16" style="width:50px; height:50px"></canvas>

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

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

<script>

"use strict";

description();

var wtu = WebGLTestUtils;

function runTest()

  var gl = wtu.create3DContext('testbed', { antialias: false });

  if (!gl) {

    testFailed('could not create context');

    return;

  var program = wtu.setupTexturedQuad(gl);

  var tex = gl.createTexture();

  var fb = gl.createFramebuffer();

  var step1 = function() {

    wtu.fillTexture(gl, tex, 1, 1, [0, 255, 0, 255]);

    wtu.clearAndDrawUnitQuad(gl);

    wtu.checkCanvas(gl, [0, 255, 0, 255], "drawing with texture should be green");

};

  var step2 = function() {

    wtu.clearAndDrawUnitQuad(gl);

    wtu.checkCanvas(gl, [0, 255, 0, 255], "drawing with texture after composite without rebinding should be green");

    // Clear background to red

    gl.clearColor(1, 0, 0, 1);

    gl.clear(gl.COLOR_BUFFER_BIT);

    // Bind framebuffer with green texture.

    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);

    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);

    wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 255, 0, 255], "reading from fbo with attached texture should be green");

};

  var step3 = function() {

    // Should still have fb bound and reading should be green

    wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 255, 0, 255], "reading from fbo after composite without rebinding should be green");

};

  var steps = [

    step1,

    step2,

    step3,

];

  var stepIndex = 0;

  var runNextStep = function() {

    steps[stepIndex++]();

    if (stepIndex == steps.length) {

      wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");

      finishTest();

      return;

    wtu.waitForComposite(runNextStep);

};

  runNextStep();

runTest();

var successfullyParsed = true;

</script>

</body>

</html>