dom/canvas/test/webgl-conf/checkout/conformance/attribs/gl-disabled-vertex-attrib-update.html

   1 <!--
   2 Copyright (c) 2019 The Khronos Group Inc.
   3 Use of this source code is governed by an MIT-style license that can be
   4 found in the LICENSE.txt file.
   5 -->
   6
   7 <!DOCTYPE html>
   8 <html>
   9 <head>
  10 <meta charset="utf-8">
  11 <title>WebGL Disabled Vertex Attrib Update Test</title>
  12 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
  13 <script src="../../js/js-test-pre.js"></script>
  14 <script src="../../js/webgl-test-utils.js"> </script>
  15 </head>
  16 <body>
  17 <canvas id="example" width="50" height="50">
  18 </canvas>
  19 <div id="description"></div>
  20 <div id="console"></div>
  21 <script id="vshader" type="x-shader/x-vertex">
  22 attribute vec4 a_position;
  23 attribute float a_actualValue;
  24 uniform float u_expectedValue;
  25 varying float v_result;
  26 void main() {
  27   gl_Position = a_position;
  28   v_result = a_actualValue == u_expectedValue ? 1.0 : 0.0;
  29 }
  30 </script>
  31
  32 <script id="fshader" type="x-shader/x-fragment">
  33 precision mediump float;
  34 varying float v_result;
  35 void main() {
  36   gl_FragColor = v_result > 0.0 ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0);
  37 }
  38 </script>
  39
  40 <script>
  41 // Tests that repeatedly updating a disabled vertex attribute works as expected.
  42 // This covers an ANGLE bug where dirty bits for current values were ignoring repeated updates.
  43 // Based on ANGLE test (VertexAttributeTest, DisabledAttribUpdates) from https://github.com/google/angle/blob/f7f0b8c3ab21c52cc2915048959361cf628d95f0/src/tests/gl_tests/VertexAttributeTest.cpp
  44 "use strict";
  45 var wtu = WebGLTestUtils;
  46 description();
  47
  48 var gl = wtu.create3DContext("example");
  49
  50 var program = wtu.setupProgram(gl, ['vshader', 'fshader']);
  51 gl.useProgram(program);
  52
  53 var positionLocation = gl.getAttribLocation(program, "a_position");
  54 var attribLoc = gl.getAttribLocation(program, "a_actualValue");
  55 gl.vertexAttribPointer(attribLoc, 1, gl.FLOAT, gl.FALSE, 0, 0);
  56
  57 var uniLoc = gl.getUniformLocation(program, "u_expectedValue");
  58
  59 var gridRes = 1;
  60 wtu.setupIndexedQuad(gl, gridRes, positionLocation);
  61
  62 var testValues = [1, 2, 3, 4];
  63 for (var i = 0; i < testValues.length; ++i) {
  64   var testValue = testValues[i];
  65   gl.uniform1f(uniLoc, testValue);
  66   gl.vertexAttrib1f(attribLoc, testValue);
  67   wtu.clearAndDrawIndexedQuad(gl, gridRes);
  68   wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
  69 }
  70
  71 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
  72
  73 var successfullyParsed = true;
  74 </script>
  75 <script src="../../js/js-test-post.js"></script>
  76
  77 </body>
  78 </html>
  79