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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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<title>WebGL Matrix Attribute Conformance Test</title>
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<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 tests ensures that matrix attribute locations do not clash with other shader attributes.");
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);
// prepareMatrixProgram creates a program with glFragmentShader as the fragment shader.
// The vertex shader has numVector number of vectors and a matrix with numMatrixDimensions
// dimensions at location numMatrixPosition in the list of attributes.
// Ensures that every vector and matrix is used by the program.
// Returns a valid program on successfull link; null on link failure.
function prepareMatrixProgram(numVectors, numMatrixDimensions, numMatrixPosition) {
// Add the matrix and vector attribute declarations. Declare the vectors
// to have the same number of components as the matrix so we can perform
// operations on them when we assign to gl_Position later on.
var strVertexShader = "";
for (var ii = 1; ii <= numVectors; ++ii) {
if (numMatrixPosition === ii) {
strVertexShader += "attribute mat" + numMatrixDimensions + " matrix;\n";
}
strVertexShader += "attribute vec" + numMatrixDimensions + " vec_" + ii + ";\n";
}
// numMatrixPosition will be one past numVectors if the caller wants it to be
// last. Hence, we need this check outside the loop as well as inside.
if (numMatrixPosition === ii) {
strVertexShader += "attribute mat" + numMatrixDimensions + " matrix;\n";
}
// Add the body of the shader. Add up all of the vectors and multiply by the matrix.
// The operations we perform do not matter. We just need to ensure that all the vector and
// matrix attributes are used.
strVertexShader += "void main(void) { \ngl_Position = vec4((";
for (var ii = 1; ii <= numVectors; ++ii) {
if (ii > 1) {
strVertexShader += "+"
}
strVertexShader += "vec_" + ii;
}
strVertexShader += ")*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";
// Load the shader, attach it to a program, and return the link results
var glVertexShader = wtu.loadShader(gl, strVertexShader, gl.VERTEX_SHADER);
var strTest = 'Load shader with ' + numVectors + ' vectors and 1 matrix';
if (glVertexShader !== null) {
testPassed(strTest);
var glProgram = gl.createProgram();
gl.attachShader(glProgram, glVertexShader);
gl.attachShader(glProgram, glFragmentShader);
gl.linkProgram(glProgram);
if (gl.getProgramParameter(glProgram, gl.LINK_STATUS)) {
wtu.glErrorShouldBe(gl, gl.NO_ERROR, 'linkProgram');
return glProgram;
}
} else {
testFailed(strTest);
}
return null;
}
debug('');
// Test mat2, mat3 and mat4.
for (var mm = 2; mm <= 4; ++mm) {
// Add maxAttribute number of attributes by saving enough room in the attribute
// list for a matrix of mm dimensions. All of the other attribute slots will be
// filled with vectors.
var numVectors = maxAttributes - mm;
for (var pp = 1; pp <= numVectors + 1; ++pp) {
debug('Test ' + mm + ' dimensional matrix at position ' + pp);
var glProgram = prepareMatrixProgram(numVectors, /*numMatrixDimensions*/mm, /*numMatrixPosition*/pp);
shouldBeNonNull('glProgram');
var attribMatrix = gl.getAttribLocation(glProgram, 'matrix');
debug('Matrix is at attribute location ' + attribMatrix);
shouldBeTrue('attribMatrix > -1');
// Per the spec, when an attribute is a matrix attribute, getAttribLocation
// returns the index of the first component of the matrix. The implementation must
// leave sufficient room for all the components. Here we ensure none of the vectors
// in the shader are assigned attribute locations that belong to the matrix.
for (var vv = 1; vv <= numVectors; ++vv) {
var strVector = 'vec_' + vv
var attribVector = gl.getAttribLocation(glProgram, strVector);
debug(strVector + ' is at attribute location ' + attribVector);
// Begin with the first attribute location where the matrix begins and ensure
// the vector's attribute location is not assigned to the matrix. Loop until
// we've checked all of the attribute locations that belong to the matrix.
for (var ii = attribMatrix; ii < attribMatrix + mm; ++ii) {
var testStr = strVector + ' attribute location: ' + attribVector + '. Should not be ' + ii;
if (attribVector !== ii) {
testPassed(testStr);
} else {
testFailed(testStr);
}
}
}
debug('');
}
debug('');
}
var successfullyParsed = true;
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