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| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>Test clearBufferfv with alpha:false canvas</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> |
| <canvas id="canvas" width="20" height="20"> </canvas> |
| <script> |
| "use strict"; |
| description("This tests the operation of clearBufferfv with the back buffer of an alpha:false canvas."); |
| |
| function verifyOnePixel(readFormat, readType, arrayType, expectedColor) { |
| var buffer = new arrayType(4); |
| gl.readPixels(0, 0, 1, 1, readFormat, readType, buffer); |
| if (buffer[0] == expectedColor[0] && |
| buffer[1] == expectedColor[1] && |
| buffer[2] == expectedColor[2] && |
| buffer[3] == expectedColor[3]) { |
| testPassed("clearBufferfv set the color buffer to the correct value"); |
| } else { |
| testFailed("clearBufferfv failed to work. Expected: " + expectedColor + ", got: " + buffer); |
| } |
| } |
| |
| function testClearBuffer(func, format, arrayType, readFormat, readType, readArrayType) { |
| debug(""); |
| debug("Testing " + func); |
| |
| var srcData = new arrayType([0, 1, 0, 0]); |
| gl[func](gl.COLOR, 0, srcData); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clearBuffer with no srcOffset should succeed"); |
| // Back buffer has no alpha channel |
| verifyOnePixel(readFormat, readType, Uint8Array, [0, 255, 0, 255]); |
| } |
| |
| var wtu = WebGLTestUtils; |
| var canvas = document.getElementById("canvas"); |
| var gl = wtu.create3DContext(canvas, { alpha:false }, 2); |
| if (!gl) { |
| testFailed("context does not exist"); |
| } else { |
| testPassed("context exists"); |
| |
| var testCases = [ |
| { |
| func: "clearBufferfv", format: gl.RGBA, arrayType: Float32Array, |
| readFormat: gl.RGBA, readType: gl.UNSIGNED_BYTE, readArrayType: Uint8Array, |
| }, |
| ]; |
| |
| for (var tt = 0; tt < testCases.length; ++tt) { |
| var test = testCases[tt]; |
| if (test.extension && !gl.getExtension(test.extension)) |
| continue; |
| testClearBuffer(test.func, test.format, test.arrayType, |
| test.readFormat, test.readType, test.readArrayType); |
| } |
| } |
| |
| debug(""); |
| wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no error"); |
| var successfullyParsed = true; |
| |
| </script> |
| <script src="../../js/js-test-post.js"></script> |
| |
| </body> |
| </html> |
