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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.
-->
<!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>
<title>WebGL bindAttribLocation with Matrix Attributes Conformance Test</title>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<canvas id="canvas" width="8" height="8" style="width: 8px; height: 8px;"></canvas>
<script>
"use strict";
description("This test verifies that vectors placed via bindAttribLocation right after matricies will fail if there is insufficient room for the matrix.");
var wtu = WebGLTestUtils;
var canvas = document.getElementById("canvas");
var gl = wtu.create3DContext(canvas, {antialias: false});
// Make sure we have room for at least a mat4.
var maxAttributes = gl.getParameter(gl.MAX_VERTEX_ATTRIBS);
debug('MAX_VERTEX_ATTRIBUTES is ' + maxAttributes);
shouldBeGreaterThanOrEqual('maxAttributes', '4');
var glFragmentShader = wtu.loadShader(gl, wtu.simpleColorFragmentShader, gl.FRAGMENT_SHADER);
// Given a matrix dimension, load a vertex shader with a matrix of that dimension
// and a vector. Ensure that both the vector and matrix are active attributes.
// Return the compiled vertex shader.
function loadVertexShader(numMatrixDimensions) {
var strVertexShader =
'attribute mat' + numMatrixDimensions + ' matrix;\n' +
'attribute vec' + numMatrixDimensions + ' vector;\n' +
'void main(void) { gl_Position = vec4(vector*matrix';
// Ensure the vec4 has the correct number of dimensions in order to be assignable
// to gl_Position.
for (var ii = numMatrixDimensions; ii < 4; ++ii) {
strVertexShader += ",0.0";
}
strVertexShader += ");}\n";
return wtu.loadShader(gl, strVertexShader, gl.VERTEX_SHADER);
}
// Given a vertex shader, matrix location and vector location, create and link
// a program with glFragmentShader and a vertex shader returned by loadVertexShader
// attached. Bind the matrix to matrixLocation and the vector to vectorLocation.
// Return whether the link was successful.
function createAndLinkProgram(glVertexShader, matrixLocation, vectorLocation) {
var glProgram = gl.createProgram();
gl.bindAttribLocation(glProgram, matrixLocation, 'matrix');
gl.bindAttribLocation(glProgram, vectorLocation, 'vector');
gl.attachShader(glProgram, glVertexShader);
gl.attachShader(glProgram, glFragmentShader);
gl.linkProgram(glProgram);
return gl.getProgramParameter(glProgram, gl.LINK_STATUS);
}
// For each matrix dimension (mat2, mat3 and mat4)
for (var mm = 2; mm <= 4; ++mm) {
debug('Testing ' + mm + ' dimensional matrices');
var glVertexShader = loadVertexShader(mm);
// Per the WebGL spec: "LinkProgram will fail if the attribute bindings assigned
// by bindAttribLocation do not leave enough space to assign a location for an
// active matrix attribute which requires multiple contiguous generic attributes."
// We will test this by placing the vector after the matrix attribute such that there
// is not enough room for the matrix. Vertify the link operation fails.
// Run the test for each available attribute slot. Go to maxAttributes-mm to leave enough room
// for the matrix itself. Leave another slot open for the vector following the matrix.
for (var pp = 0; pp <= maxAttributes - mm - 1; ++pp) {
// For each matrix dimension, bind the vector right after the matrix such that we leave
// insufficient room for the matrix. Verify doing this will fail the link operation.
for (var ll = 0; ll < mm; ++ll) {
var vectorLocation = pp + ll;
assertMsg(!createAndLinkProgram(glVertexShader, /*matrixLocation*/pp, vectorLocation),
"Matrix with location " + pp + " and vector with location " + vectorLocation + " should not link.");
}
// Ensure that once we have left enough room for the matrix, the program links successfully.
var vectorLocation = pp + ll;
assertMsg(createAndLinkProgram(glVertexShader, /*matrixLocation*/pp, vectorLocation),
"Matrix with location " + pp + " and vector with location " + vectorLocation + " should link.");
debug('');
}
debug('');
}
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
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