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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.
*/
"use strict";
var runBindAttribLocationAliasingTest = function(wtu, gl, glFragmentShader, vertexShaderTemplate) {
var typeInfo = [
{ type: 'float', asVec4: 'vec4(0.0, $(var), 0.0, 1.0)' },
{ type: 'vec2', asVec4: 'vec4($(var), 0.0, 1.0)' },
{ type: 'vec3', asVec4: 'vec4($(var), 1.0)' },
{ type: 'vec4', asVec4: '$(var)' },
];
var maxAttributes = gl.getParameter(gl.MAX_VERTEX_ATTRIBS);
// Test all type combinations of a_1 and a_2.
typeInfo.forEach(function(typeInfo1) {
typeInfo.forEach(function(typeInfo2) {
debug('attribute_1: ' + typeInfo1.type + ' attribute_2: ' + typeInfo2.type);
var replaceParams = {
type_1: typeInfo1.type,
type_2: typeInfo2.type,
gl_Position_1: wtu.replaceParams(typeInfo1.asVec4, {var: 'a_1'}),
gl_Position_2: wtu.replaceParams(typeInfo2.asVec4, {var: 'a_2'})
};
var strVertexShader = wtu.replaceParams(vertexShaderTemplate, replaceParams);
var glVertexShader = wtu.loadShader(gl, strVertexShader, gl.VERTEX_SHADER);
assertMsg(glVertexShader != null, "Vertex shader compiled successfully.");
// Bind both a_1 and a_2 to the same position and verify the link fails.
// Do so for all valid positions available.
for (var l = 0; l < maxAttributes; l++) {
var glProgram = gl.createProgram();
gl.bindAttribLocation(glProgram, l, 'a_1');
gl.bindAttribLocation(glProgram, l, 'a_2');
gl.attachShader(glProgram, glVertexShader);
gl.attachShader(glProgram, glFragmentShader);
gl.linkProgram(glProgram);
var linkStatus = gl.getProgramParameter(glProgram, gl.LINK_STATUS);
assertMsg(!linkStatus, "Link should fail when both attributes are aliased to location " + l);
}
});
});
};