gl-bindattriblocation-aliasing.js (2147B)
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 "use strict"; 8 9 var runBindAttribLocationAliasingTest = function(wtu, gl, glFragmentShader, vertexShaderTemplate) { 10 var typeInfo = [ 11 { type: 'float', asVec4: 'vec4(0.0, $(var), 0.0, 1.0)' }, 12 { type: 'vec2', asVec4: 'vec4($(var), 0.0, 1.0)' }, 13 { type: 'vec3', asVec4: 'vec4($(var), 1.0)' }, 14 { type: 'vec4', asVec4: '$(var)' }, 15 ]; 16 var maxAttributes = gl.getParameter(gl.MAX_VERTEX_ATTRIBS); 17 // Test all type combinations of a_1 and a_2. 18 typeInfo.forEach(function(typeInfo1) { 19 typeInfo.forEach(function(typeInfo2) { 20 debug('attribute_1: ' + typeInfo1.type + ' attribute_2: ' + typeInfo2.type); 21 var replaceParams = { 22 type_1: typeInfo1.type, 23 type_2: typeInfo2.type, 24 gl_Position_1: wtu.replaceParams(typeInfo1.asVec4, {var: 'a_1'}), 25 gl_Position_2: wtu.replaceParams(typeInfo2.asVec4, {var: 'a_2'}) 26 }; 27 var strVertexShader = wtu.replaceParams(vertexShaderTemplate, replaceParams); 28 var glVertexShader = wtu.loadShader(gl, strVertexShader, gl.VERTEX_SHADER); 29 assertMsg(glVertexShader != null, "Vertex shader compiled successfully."); 30 // Bind both a_1 and a_2 to the same position and verify the link fails. 31 // Do so for all valid positions available. 32 for (var l = 0; l < maxAttributes; l++) { 33 var glProgram = gl.createProgram(); 34 gl.bindAttribLocation(glProgram, l, 'a_1'); 35 gl.bindAttribLocation(glProgram, l, 'a_2'); 36 gl.attachShader(glProgram, glVertexShader); 37 gl.attachShader(glProgram, glFragmentShader); 38 gl.linkProgram(glProgram); 39 var linkStatus = gl.getProgramParameter(glProgram, gl.LINK_STATUS); 40 assertMsg(!linkStatus, "Link should fail when both attributes are aliased to location " + l); 41 } 42 }); 43 }); 44 };