| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>Verifies that GL framebuffer bindings do not change when canvas is resized</title> |
| <script src="../../../resources/js-test.js"></script> |
| <script src="resources/webgl-test.js"></script> |
| <script src="resources/webgl-test-utils.js"></script> |
| </head> |
| <body> |
| <canvas id="example" width="4px" height="4px"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| description("Verifies that GL framebuffer bindings do not change when canvas is resized"); |
| |
| if (window.initNonKhronosFramework) { |
| window.initNonKhronosFramework(true); |
| } |
| |
| var err; |
| var wtu = WebGLTestUtils; |
| var canvas = document.getElementById("example"); |
| var gl = wtu.create3DContext(canvas); |
| var green = [0, 255, 0, 255]; |
| var blue = [0, 0, 255, 255]; |
| var fboSize = 2; |
| shouldBeTrue("fboSize < canvas.width"); |
| var fbo = gl.createFramebuffer(); |
| gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); |
| var fboTex = gl.createTexture(); |
| gl.activeTexture(gl.TEXTURE1); |
| gl.bindTexture(gl.TEXTURE_2D, fboTex); |
| gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, fboTex, 0); |
| gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, fboSize, fboSize, 0, gl.RGBA, gl.UNSIGNED_BYTE, null); |
| gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR); |
| gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR); |
| gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE); |
| gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE); |
| shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE"); |
| |
| function checkFBO(color, msg) { |
| wtu.checkCanvasRect(gl, 0, 0, fboSize, fboSize, color, msg); |
| wtu.checkCanvasRect(gl, fboSize, fboSize, fboSize, fboSize, [0, 0, 0, 0], "area outside fbo should be transparent black"); |
| } |
| |
| // The FBO is 2x2 and it's bound so clearing should clear a 2x2 area |
| // and calling read pixels should read the clear color in that 2x2 area |
| // and 0,0,0,0 outside that area. |
| // |
| // If the FBO is no longer bound because of a WebGL implementation error |
| // then likely the clear will clear the backbuffer and reading outside |
| // the 2x2 area will not be 0,0,0,0 |
| |
| function test() { |
| gl.clearColor(0, 0, 1, 1); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| checkFBO(blue, "should be blue"); |
| gl.clearColor(0, 1, 0, 1); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| checkFBO(green, "should be green"); |
| } |
| |
| debug("test before resizing canvas"); |
| test(); |
| debug("test after resizing canvas"); |
| canvas.width = 8; |
| test(); |
| debug("test after resizing canvas and waiting for compositing"); |
| canvas.width = 16; |
| wtu.waitFrames(5, function() { |
| test(); |
| glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors."); |
| finishTest(); |
| }); |
| </script> |
| </body> |
| </html> |
| |
