| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <!-- |
| 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. |
| --> |
| <title>WebGL attrib location length tests</title> |
| <link rel="stylesheet" href="../../../resources/js-test-style.css"/> |
| <link rel="stylesheet" href="../../../resources/glsl-feature-tests.css"/> |
| <script src="../../../js/js-test-pre.js"></script> |
| <script src="../../../js/webgl-test-utils.js"> </script> |
| </head> |
| <body> |
| <canvas id="example" width="50" height="50"> |
| There is supposed to be an example drawing here, but it's not important. |
| </canvas> |
| <div id="description">Verify limits on the lengths of attribute locations per WebGL spec, "Maximum Uniform and Attribute Location Lengths".</div> |
| <div id="console"></div> |
| <script id="goodVertexShader" type="x-shader/x-vertex"> |
| // A vertex shader where the needed attrib location is exactly 256 characters. |
| attribute vec4 vPosition0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456; |
| |
| void main() |
| { |
| gl_Position = vPosition0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456; |
| } |
| </script> |
| <script id="badVertexShader" type="x-shader/x-vertex"> |
| // A vertex shader where the needed attrib location is 257 characters. |
| attribute vec4 vPosition01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567; |
| |
| void main() |
| { |
| gl_Position = vPosition01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567; |
| } |
| </script> |
| <script id="fragmentShader" type="x-shader/x-fragment"> |
| precision mediump float; |
| |
| void main() { |
| gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0); |
| } |
| </script> |
| <script> |
| "use strict"; |
| description("test attrib location length limit"); |
| |
| var wtu = WebGLTestUtils; |
| var gl = wtu.create3DContext("example"); |
| |
| debug("Test attrib location underneath the length limit"); |
| var program = wtu.loadProgramFromScript(gl, "goodVertexShader", "fragmentShader"); |
| shouldBe('gl.getProgramParameter(program, gl.LINK_STATUS)', 'true'); |
| var attrib256Name = "vPosition0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456"; |
| gl.bindAttribLocation(program, 0, attrib256Name); |
| wtu.glErrorShouldBe(gl, gl.NONE); |
| var attribLoc = gl.getAttribLocation(program, attrib256Name); |
| if (attribLoc == -1) { |
| testFailed("attrib location was -1, should not be"); |
| } else { |
| testPassed("attrib location should not be -1"); |
| } |
| wtu.glErrorShouldBe(gl, gl.NONE); |
| |
| debug("Test attrib location over the length limit"); |
| var attrib257Name = attrib256Name + "7"; |
| |
| debug("Shader compilation or link should fail"); |
| shouldBe('wtu.loadProgramFromScriptExpectError(gl, "badVertexShader", "fragmentShader")', 'null'); |
| wtu.glErrorShouldBe(gl, gl.NONE); |
| |
| debug("Attempt to bind too-long attrib location should produce error"); |
| program = gl.createProgram(); |
| gl.bindAttribLocation(program, 0, attrib257Name); |
| wtu.glErrorShouldBe(gl, gl.INVALID_VALUE); |
| |
| debug("Attempt to fetch too-long attrib location should produce error"); |
| program = wtu.loadStandardProgram(gl); |
| shouldBe('gl.getAttribLocation(program, attrib257Name)', '-1'); |
| wtu.glErrorShouldBe(gl, gl.INVALID_VALUE); |
| |
| var successfullyParsed = true; |
| </script> |
| <script src="../../../js/js-test-post.js"></script> |
| </body> |
| </html> |
