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| 1 <!-- |
| 2 Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 3 Use of this source code is governed by a BSD-style license that can be |
| 4 found in the LICENSE file. |
| 5 --> |
| 6 <!DOCTYPE html> |
| 7 <html> |
| 8 <head> |
| 9 <meta charset="utf-8"> |
| 10 <title>gl-pointcoord Test</title> |
| 11 <link rel="stylesheet" href="../../../resources/js-test-style.css"/> |
| 12 <script src="../../../resources/js-test-pre.js"></script> |
| 13 <script src="../../resources/webgl-test.js"> </script> |
| 14 <script src="../../resources/webgl-test-utils.js"> </script> |
| 15 </head> |
| 16 <body> |
| 17 <canvas id="example" width="256" height="256"> |
| 18 </canvas> |
| 19 <div id="description"></div> |
| 20 <div id="console"></div> |
| 21 <script id="vshader" type="x-shader/x-vertex"> |
| 22 attribute vec4 vPosition; |
| 23 uniform float uPointSize; |
| 24 void main() |
| 25 { |
| 26 gl_PointSize = uPointSize; |
| 27 gl_Position = vPosition; |
| 28 } |
| 29 </script> |
| 30 |
| 31 <script id="fshader" type="x-shader/x-fragment"> |
| 32 precision mediump float; |
| 33 void main() |
| 34 { |
| 35 gl_FragColor = vec4( |
| 36 gl_PointCoord.x, |
| 37 gl_PointCoord.y, |
| 38 0, |
| 39 1); |
| 40 } |
| 41 </script> |
| 42 |
| 43 <script> |
| 44 function init() |
| 45 { |
| 46 if (window.initNonKhronosFramework) { |
| 47 window.initNonKhronosFramework(false); |
| 48 } |
| 49 |
| 50 description("Checks gl_PointCoord and gl_PointSize"); |
| 51 debug(""); |
| 52 |
| 53 // NOTE: I'm not 100% confident in this test. I think it is correct. |
| 54 |
| 55 wtu = WebGLTestUtils; |
| 56 gl = initWebGL("example", "vshader", "fshader", [ "vPosition"], [ 0, 0, 0,
1 ], 1); |
| 57 |
| 58 canvas = gl.canvas; |
| 59 width = canvas.width; |
| 60 height = canvas.height; |
| 61 shouldBeTrue("width == height"); |
| 62 |
| 63 maxPointSize = gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE)[1]; |
| 64 shouldBeTrue("maxPointSize >= 1"); |
| 65 shouldBeTrue("maxPointSize % 1 == 0"); |
| 66 |
| 67 maxPointSize = Math.min(maxPointSize, 64); |
| 68 pointWidth = maxPointSize / width; |
| 69 pointStep = Math.floor(maxPointSize / 4); |
| 70 pointStep = Math.max(1, pointStep); |
| 71 |
| 72 program = gl.program; |
| 73 pointSizeLoc = gl.getUniformLocation(program, "uPointSize"); |
| 74 gl.uniform1f(pointSizeLoc, maxPointSize); |
| 75 |
| 76 var pixelOffset = (maxPointSize % 2) ? (1 / width) : 0; |
| 77 var vertexObject = gl.createBuffer(); |
| 78 gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject); |
| 79 gl.bufferData( |
| 80 gl.ARRAY_BUFFER, |
| 81 new Float32Array( |
| 82 [-0.5 + pixelOffset, -0.5 + pixelOffset, |
| 83 0.5 + pixelOffset, -0.5 + pixelOffset, |
| 84 -0.5 + pixelOffset, 0.5 + pixelOffset, |
| 85 0.5 + pixelOffset, 0.5 + pixelOffset]), |
| 86 gl.STATIC_DRAW); |
| 87 gl.enableVertexAttribArray(0); |
| 88 gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0); |
| 89 |
| 90 gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); |
| 91 |
| 92 gl.drawArrays(gl.POINTS, 0, 4); |
| 93 function s2p(s) { |
| 94 return (s + 1.0) * 0.5 * width; |
| 95 } |
| 96 |
| 97 //function print(x, y) { |
| 98 // var b = new Uint8Array(4); |
| 99 // gl.readPixels(x, y, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, b); |
| 100 // debug("" + x + "," + y + ": " + b[0] + "," + b[1] + "," + b[2]); |
| 101 //} |
| 102 // |
| 103 //for (var ii = 0; ii < 100; ++ii) { |
| 104 // print(ii, ii); |
| 105 //} |
| 106 |
| 107 for (var py = 0; py < 2; ++py) { |
| 108 for (var px = 0; px < 2; ++px) { |
| 109 debug(""); |
| 110 var pointX = -0.5 + px + pixelOffset; |
| 111 var pointY = -0.5 + py + pixelOffset; |
| 112 for (var yy = 0; yy < maxPointSize; yy += pointStep) { |
| 113 for (var xx = 0; xx < maxPointSize; xx += pointStep) { |
| 114 // formula for s and t from OpenGL ES 2.0 spec section 3.3 |
| 115 var xw = s2p(pointX); |
| 116 var yw = s2p(pointY); |
| 117 //debug("xw: " + xw + " yw: " + yw); |
| 118 var u = xx / maxPointSize * 2 - 1; |
| 119 var v = yy / maxPointSize * 2 - 1; |
| 120 var xf = Math.floor(s2p(pointX + u * pointWidth)); |
| 121 var yf = Math.floor(s2p(pointY + v * pointWidth)); |
| 122 //debug("xf: " + xf + " yf: " + yf); |
| 123 var s = 0.5 + (xf + 0.5 - xw) / maxPointSize; |
| 124 var t = 0.5 + (yf + 0.5 - yw) / maxPointSize; |
| 125 //debug("s: " + s + " t: " + t); |
| 126 var color = [Math.floor(s * 255), Math.floor((1 - t) * 255), 0]; |
| 127 var msg = "pixel " + xf + "," + yf + " should be " + color; |
| 128 wtu.checkCanvasRect(gl, xf, yf, 1, 1, color, msg, 4); |
| 129 } |
| 130 } |
| 131 } |
| 132 } |
| 133 } |
| 134 |
| 135 init(); |
| 136 successfullyParsed = true; |
| 137 </script> |
| 138 <script src="../../../resources/js-test-post.js"></script> |
| 139 |
| 140 </body> |
| 141 </html> |
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Chromium Code Reviews
Issue 8342021:
Add webgl conformance tests r15841. (Closed)
Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/webgl/sdk/tests/