| <!-- |
| |
| /* |
| ** Copyright (c) 2012 The Khronos Group Inc. |
| ** |
| ** Permission is hereby granted, free of charge, to any person obtaining a |
| ** copy of this software and/or associated documentation files (the |
| ** "Materials"), to deal in the Materials without restriction, including |
| ** without limitation the rights to use, copy, modify, merge, publish, |
| ** distribute, sublicense, and/or sell copies of the Materials, and to |
| ** permit persons to whom the Materials are furnished to do so, subject to |
| ** the following conditions: |
| ** |
| ** The above copyright notice and this permission notice shall be included |
| ** in all copies or substantial portions of the Materials. |
| ** |
| ** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| ** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| ** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS. |
| */ |
| |
| --> |
| |
| <!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> |
| <script id='vshader' type='x-shader'> |
| attribute vec4 a; |
| attribute vec2 p; |
| void main() { |
| gl_Position = vec4(p.x + a.x + a.y + a.z + a.w, p.y, 0.0, 1.0); |
| } |
| </script> |
| <script id='fshader' type='x-shader'> |
| precision mediump float; |
| void main() { |
| gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0); |
| } |
| </script> |
| <script> |
| "use strict"; |
| function checkRedPortion(gl, w, low, high) { |
| var buf = new Uint8Array(w * w * 4); |
| gl.readPixels(0, 0, w, w, gl.RGBA, gl.UNSIGNED_BYTE, buf); |
| var i = 0; |
| for (; i < w; ++i) { |
| if (buf[i * 4 + 0] == 255 && buf[i * 4 + 1] == 0 && buf[i * 4 + 2] == 0 && buf[i * 4 + 3] == 255) { |
| break; |
| } |
| } |
| return low <= i && i <= high; |
| } |
| |
| function runTest() { |
| var wtu = WebGLTestUtils; |
| var gl = wtu.create3DContext('testbed', { preserveDrawingBuffer : true }); |
| if (!gl) { |
| testFailed('could not create context'); |
| return; |
| } |
| var program = wtu.setupProgram(gl, ['vshader', 'fshader'], ['p', 'a']) |
| |
| gl.enableVertexAttribArray(gl.p); |
| var pos = gl.createBuffer(); |
| pos.type = gl.FLOAT; |
| pos.size = 2; |
| pos.num = 4; |
| gl.bindBuffer(gl.ARRAY_BUFFER, pos); |
| gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([-1, -1, 1, -1, -1, 1, 1, 1]), gl.STATIC_DRAW); |
| |
| gl.vertexAttribPointer(0, pos.size, pos.type, false, 0, 0); |
| |
| debug('Test vertexAttrib[1..4]fv by setting different combinations that add up to 1.5 and use that when rendering.'); |
| var vals = [[0.5], [0.1,0.4], [0.2,-0.2,0.5], [-1.0,0.3,0.2,2.0]]; |
| |
| for (var j = 0; j < 4; ++j) { |
| gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); |
| gl['vertexAttrib' + (j+1) + 'fv'](1, vals[j]); |
| gl.drawArrays(gl.TRIANGLE_STRIP, 0, pos.num); |
| |
| if (checkRedPortion(gl, 50, 50 * 0.7, 50 * 0.8)) { |
| testPassed('Attribute of size ' + (j+1) + ' was set correctly'); |
| } else { |
| testFailed('Attribute of size ' + (j+1) + ' was not set correctly'); |
| } |
| } |
| } |
| </script> |
| </head> |
| <body> |
| <canvas id="testbed" width="50" height="50"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| "use strict"; |
| description('Verify that using constant attributes works.'); |
| runTest(); |
| var successfullyParsed = true; |
| </script> |
| <script src="../../js/js-test-post.js"></script> |
| </body> |
| </html> |
