dom/canvas/test/webgl-conf/checkout/conformance/attribs/gl-matrix-attributes.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.
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   7 <html>
   8 <head>
   9 <meta charset="utf-8">
  10 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
  11 <script src="../../js/js-test-pre.js"></script>
  12 <script src="../../js/webgl-test-utils.js"></script>
  13 <title>WebGL Matrix Attribute Conformance Test</title>
  14 </head>
  15 <body>
  16 <div id="description"></div>
  17 <div id="console"></div>
  18 <canvas id="canvas" width="8" height="8" style="width: 8px; height: 8px;"></canvas>
  19 <script>
  20 "use strict";
  21 description("This tests ensures that matrix attribute locations do not clash with other shader attributes.");
  22
  23 var wtu = WebGLTestUtils;
  24 var canvas = document.getElementById("canvas");
  25 var gl = wtu.create3DContext(canvas, {antialias: false});
  26
  27 // Make sure we have room for at least a mat4.
  28 var maxAttributes = gl.getParameter(gl.MAX_VERTEX_ATTRIBS);
  29 debug('MAX_VERTEX_ATTRIBUTES is ' + maxAttributes);
  30 shouldBeGreaterThanOrEqual('maxAttributes', '4');
  31
  32 var glFragmentShader = wtu.loadShader(gl, wtu.simpleColorFragmentShader, gl.FRAGMENT_SHADER);
  33
  34 // prepareMatrixProgram creates a program with glFragmentShader as the fragment shader.
  35 // The vertex shader has numVector number of vectors and a matrix with numMatrixDimensions
  36 // dimensions at location numMatrixPosition in the list of attributes.
  37 // Ensures that every vector and matrix is used by the program.
  38 // Returns a valid program on successfull link; null on link failure.
  39 function prepareMatrixProgram(numVectors, numMatrixDimensions, numMatrixPosition) {
  40     // Add the matrix and vector attribute declarations. Declare the vectors
  41     // to have the same number of components as the matrix so we can perform
  42     // operations on them when we assign to gl_Position later on.
  43     var strVertexShader = "";
  44     for (var ii = 1; ii <= numVectors; ++ii) {
  45         if (numMatrixPosition === ii) {
  46             strVertexShader += "attribute mat" + numMatrixDimensions + " matrix;\n";
  47         }
  48         strVertexShader += "attribute vec" + numMatrixDimensions + " vec_" + ii + ";\n";
  49     }
  50     // numMatrixPosition will be one past numVectors if the caller wants it to be
  51     // last. Hence, we need this check outside the loop as well as inside.
  52     if (numMatrixPosition === ii) {
  53         strVertexShader += "attribute mat" + numMatrixDimensions + " matrix;\n";
  54     }
  55     // Add the body of the shader. Add up all of the vectors and multiply by the matrix.
  56     // The operations we perform do not matter. We just need to ensure that all the vector and
  57     // matrix attributes are used.
  58     strVertexShader +=  "void main(void) { \ngl_Position = vec4((";
  59     for (var ii = 1; ii <= numVectors; ++ii) {
  60         if (ii > 1) {
  61             strVertexShader += "+"
  62         }
  63         strVertexShader += "vec_" + ii;
  64     }
  65     strVertexShader += ")*matrix";
  66     // Ensure the vec4 has the correct number of dimensions in order to be assignable
  67     // to gl_Position.
  68     for (var ii = numMatrixDimensions; ii < 4; ++ii) {
  69         strVertexShader += ",0.0";
  70     }
  71     strVertexShader += ");}\n";
  72     // Load the shader, attach it to a program, and return the link results
  73     var glVertexShader = wtu.loadShader(gl, strVertexShader, gl.VERTEX_SHADER);
  74     var strTest = 'Load shader with ' + numVectors + ' vectors and 1 matrix';
  75     if (glVertexShader !== null) {
  76         testPassed(strTest);
  77
  78         var glProgram = gl.createProgram();
  79         gl.attachShader(glProgram, glVertexShader);
  80         gl.attachShader(glProgram, glFragmentShader);
  81         gl.linkProgram(glProgram);
  82         if (gl.getProgramParameter(glProgram, gl.LINK_STATUS)) {
  83             wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'linkProgram');
  84             return glProgram;
  85         }
  86     } else {
  87         testFailed(strTest);
  88     }
  89     return null;
  90 }
  91
  92 debug('');
  93
  94 // Test mat2, mat3 and mat4.
  95 for (var mm = 2; mm <= 4; ++mm) {
  96     // Add maxAttribute number of attributes by saving enough room in the attribute
  97     // list for a matrix of mm dimensions. All of the other attribute slots will be
  98     // filled with vectors.
  99     var numVectors = maxAttributes - mm;
 100     for (var pp = 1; pp <= numVectors + 1; ++pp) {
 101         debug('Test ' + mm + ' dimensional matrix at position ' + pp);
 102         var glProgram = prepareMatrixProgram(numVectors, /*numMatrixDimensions*/mm, /*numMatrixPosition*/pp);
 103         shouldBeNonNull('glProgram');
 104         var attribMatrix = gl.getAttribLocation(glProgram, 'matrix');
 105         debug('Matrix is at attribute location ' + attribMatrix);
 106         shouldBeTrue('attribMatrix > -1');
 107         // Per the spec, when an attribute is a matrix attribute, getAttribLocation
 108         // returns the index of the first component of the matrix. The implementation must
 109         // leave sufficient room for all the components. Here we ensure none of the vectors
 110         // in the shader are assigned attribute locations that belong to the matrix.
 111         for (var vv = 1; vv <= numVectors; ++vv) {
 112             var strVector = 'vec_' + vv
 113             var attribVector = gl.getAttribLocation(glProgram, strVector);
 114             debug(strVector + ' is at attribute location ' + attribVector);
 115             // Begin with the first attribute location where the matrix begins and ensure
 116             // the vector's attribute location is not assigned to the matrix. Loop until
 117             // we've checked all of the attribute locations that belong to the matrix.
 118             for (var ii = attribMatrix; ii < attribMatrix + mm; ++ii) {
 119                 var testStr = strVector + ' attribute location: ' + attribVector + '.  Should not be ' + ii;
 120                 if (attribVector !== ii) {
 121                     testPassed(testStr);
 122                 } else {
 123                     testFailed(testStr);
 124                 }
 125             }
 126         }
 127         debug('');
 128     }
 129     debug('');
 130 }
 131
 132 var successfullyParsed = true;
 133 </script>
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 136 </html>