| <!-- |
| 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. |
| --> |
| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>Verify that line width limits are enforced.</title> |
| <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> |
| </head> |
| <body> |
| <canvas id="example" width="4" height="4" style="width: 40px; height: 30px;"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| "use strict"; |
| description(document.title); |
| var wtu = WebGLTestUtils; |
| var gl = wtu.create3DContext("example"); |
| |
| // Query the line width range |
| var lineWidthRange = gl.getParameter(gl.ALIASED_LINE_WIDTH_RANGE); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors."); |
| |
| if (lineWidthRange[0] > 1 || lineWidthRange[1] < 1) |
| testFailed("Line width range must include width 1"); |
| |
| // Zero, negative, or NaN values should cause an error and leave the value unchanged. |
| var curLineWidth = gl.getParameter(gl.LINE_WIDTH); |
| gl.lineWidth(0); |
| wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Should not be able to set lineWidth to zero"); |
| shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'curLineWidth'); // Previous value should be preserved |
| |
| gl.lineWidth(-1); |
| wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Should not be able to set lineWidth to a negative value"); |
| shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'curLineWidth'); // Previous value should be preserved |
| |
| gl.lineWidth(NaN); |
| wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Should not be able to set lineWidth to NaN"); |
| shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'curLineWidth'); // Previous value should be preserved |
| |
| // Check that the line width can be set to the valid range. |
| gl.lineWidth(lineWidthRange[1]); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be able to set lineWidth to the max supported value"); |
| shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'lineWidthRange[1]'); |
| |
| gl.lineWidth(lineWidthRange[0]); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be able to set lineWidth to the min supported value"); |
| shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'lineWidthRange[0]'); |
| |
| // Checks that the line width can be set outside the supported range without error, |
| // and the unclamped value can be queried back. |
| // Yes, this is actually what the spec says should happen. |
| // See: https://www.khronos.org/opengles/sdk/docs/man3/html/glLineWidth.xhtml |
| gl.lineWidth(lineWidthRange[1]+1); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be able to set lineWidth to the above max supported value"); |
| shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'lineWidthRange[1]+1'); |
| |
| var successfullyParsed = true; |
| |
| </script> |
| <script src="../../js/js-test-post.js"></script> |
| |
| </body> |
| </html> |
| |
| |
