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| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>WebGL Canvas.drawingBufferWidth,drawingBufferHeight Conformance Tests</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> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| "use strict"; |
| description(); |
| debug(""); |
| |
| var gl; |
| var oldViewport; |
| |
| function getMaxViewportDimensions() { |
| // create a fresh canvas. This canvas will be discarded |
| // after exiting this function. |
| var canvas = document.createElement("canvas"); |
| gl = wtu.create3DContext(canvas, {antialias: false}); |
| if (!gl) { |
| testFailed("context does not exist"); |
| return [0, 0]; |
| } else { |
| testPassed("context exists"); |
| |
| // For a default size canvas these should be equal. |
| // WebGL contexts are not allowed to change the size of the drawingBuffer |
| // for things like hi-res displays. |
| shouldBe('gl.drawingBufferWidth', 'gl.canvas.width'); |
| shouldBe('gl.drawingBufferHeight', 'gl.canvas.height'); |
| return gl.getParameter(gl.MAX_VIEWPORT_DIMS); |
| } |
| } |
| |
| function test(desiredWidth, desiredHeight) { |
| debug(""); |
| debug("testing canvas width = " + desiredWidth + ", height = " + desiredHeight); |
| |
| // Make a fresh canvas. |
| var canvas = document.createElement("canvas"); |
| canvas.width = desiredWidth; |
| canvas.height = desiredHeight; |
| |
| // This 'gl' must be global for shouldBe to work. |
| gl = wtu.create3DContext(canvas, {antialias: false}); |
| if (!gl) { |
| testFailed("context does not exist"); |
| } else { |
| testPassed("context exists"); |
| |
| // Verify these stats didn't change since they come from a different |
| // context. |
| shouldBe('gl.getParameter(gl.MAX_VIEWPORT_DIMS)[0]', 'maxSize[0]'); |
| shouldBe('gl.getParameter(gl.MAX_VIEWPORT_DIMS)[1]', 'maxSize[1]'); |
| |
| // check the initial viewport matches the drawingBufferWidth and drawingBufferHeight |
| shouldBe('gl.getParameter(gl.VIEWPORT)[0]', '0'); |
| shouldBe('gl.getParameter(gl.VIEWPORT)[1]', '0'); |
| shouldBe('gl.getParameter(gl.VIEWPORT)[2]', 'gl.drawingBufferWidth'); |
| shouldBe('gl.getParameter(gl.VIEWPORT)[3]', 'gl.drawingBufferHeight'); |
| |
| debug(""); |
| debug("testing resizing canvas to width = " + desiredWidth + ", height = " + desiredHeight); |
| |
| oldViewport = gl.getParameter(gl.VIEWPORT); |
| |
| // flip width and height |
| canvas.width = desiredHeight; |
| canvas.height = desiredWidth; |
| |
| // Verify the viewport didn't change. |
| shouldBe('gl.getParameter(gl.VIEWPORT)[0]', 'oldViewport[0]'); |
| shouldBe('gl.getParameter(gl.VIEWPORT)[1]', 'oldViewport[1]'); |
| shouldBe('gl.getParameter(gl.VIEWPORT)[2]', 'oldViewport[2]'); |
| shouldBe('gl.getParameter(gl.VIEWPORT)[3]', 'oldViewport[3]'); |
| |
| // fix the viewport |
| // gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight); |
| |
| shouldBe('gl.getError()', 'gl.NO_ERROR'); |
| } |
| } |
| |
| var wtu = WebGLTestUtils; |
| var maxSize = getMaxViewportDimensions(); |
| debug("MAX_VIEWPORT_DIMS: " + maxSize[0] + ", " + maxSize[1]); |
| |
| shouldBeTrue('maxSize[0] > 0'); |
| shouldBeTrue('maxSize[1] > 0'); |
| |
| // test a small size to make sure it works at all. |
| test(16, 32); |
| |
| // Make a canvas slightly larger than the max size WebGL can handle. |
| // From section 2.2 of the spec the WebGL implementation should allow this to work. |
| |
| // test a size larger than MAX_VIEWPORT_DIMS in both dimensions |
| test(maxSize[0] + 32, 8); |
| |
| debug("") |
| var successfullyParsed = true; |
| </script> |
| <script src="../../js/js-test-post.js"></script> |
| </body> |
| </html> |