| <html> |
| <head> |
| <script src="../../../resources/js-test.js"></script> |
| <script src="resources/webgl-test.js"></script> |
| <script> |
| function runTest(gl, width, height) |
| { |
| |
| debug('Test whether the WebGL internal buffers have been initialized to 0.'); |
| var totalBytes = width * height * 4; |
| var buf = new Uint8Array(totalBytes); |
| gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf); |
| if (gl.getError() != gl.NO_ERROR) { |
| testFailed('GL error detected after readPixels().'); |
| return false; |
| } |
| for (var i = 0; i < totalBytes; ++i) { |
| if (buf[i] != 0) { |
| testFailed('WebGL internal buffers are dirty.'); |
| return false; |
| } |
| } |
| testPassed('Buffers have been initialized to 0.'); |
| |
| debug('Test whether user created buffers have been initialized to 0.'); |
| var fbo = gl.createFramebuffer(); |
| gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); |
| var colorbuffer = gl.createRenderbuffer(); |
| gl.bindRenderbuffer(gl.RENDERBUFFER, colorbuffer); |
| gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, width, height); |
| if (gl.getError() != gl.NO_ERROR) { |
| testFailed('GL error detected after renderbufferStorage(internalformat = RGBA4).'); |
| return false; |
| } |
| gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, colorbuffer); |
| if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) { |
| testFailed('Framebuffer incomplete.'); |
| return false; |
| } |
| gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf); |
| if (gl.getError() != gl.NO_ERROR) { |
| testFailed('GL error detected after readPixels().'); |
| return false; |
| } |
| for (var i = 0; i < totalBytes; ++i) { |
| if (buf[i] != 0) { |
| testFailed('User created buffers are dirty.'); |
| return false; |
| } |
| } |
| |
| testPassed('Buffers have been initialized to 0.'); |
| return true; |
| } |
| </script> |
| </head> |
| <body> |
| <canvas id="testbed" width="400px" height="400px"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| |
| description('Verify renderbuffers are initialized to 0 before being read in WebGL'); |
| |
| var canvas = document.getElementById("testbed"); |
| var gl = canvas.getContext("experimental-webgl"); |
| if (gl) { |
| runTest(gl, canvas.width, canvas.height); |
| |
| // Testing that canvas resizing will clear the buffers with 0 instead of the current clear values. |
| gl.clearColor(1, 0, 0, 1); |
| canvas.width += 1; |
| canvas.height += 1; |
| runTest(gl, canvas.width, canvas.height); |
| |
| // Testing buffer clearing won't change the clear values. |
| var clearColor = gl.getParameter(gl.COLOR_CLEAR_VALUE); |
| shouldBe("clearColor", "[1, 0, 0, 1]"); |
| } else |
| testFailed('canvas.getContext() failed'); |
| </script> |
| </body> |
| </html> |
