gl-disabled-vertex-attrib-update.html (2403B)
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>