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POExtra Space in WebGL Despite Same Dimension
 

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  1. POExtra Space in WebGL Despite Same Dimension
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    <p>In short, I am rendering a 2D image on a quad that fills the viewport. In Firefox it looks fine, but Chrome has a 1px spacing on the right and bottom. What I did was set the dimension of the canvas and viewport to the size of the image. Am I doing anything wrong?</p> <p><img src="https://i.stack.imgur.com/UHmTW.jpg" alt="Screenshot of problem"></p> <p>Here's my code in case you want to see it.</p> <pre><code>function initShaders() { var fragmentShader = getShader(gl, "shader-fs"); var vertexShader = getShader(gl, "shader-vs"); //create the program shaderProgram = gl.createProgram(); gl.attachShader(shaderProgram, vertexShader); gl.attachShader(shaderProgram, fragmentShader); gl.linkProgram(shaderProgram); if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) { console.error("Could not initialise shaders"); } gl.useProgram(shaderProgram); //standard shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition"); gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute); shaderProgram.textureCoordAttribute = gl.getAttribLocation(shaderProgram, "aTextureCoord"); gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute); shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler"); //custom uniforms shaderProgram.brightnessUniform = gl.getUniformLocation(shaderProgram, 'brightness'); shaderProgram.saturationUniform = gl.getUniformLocation(shaderProgram, 'saturation'); } var neheTexture; function initTexture(callback) { neheTexture = gl.createTexture(); neheTexture.image = new Image(); neheTexture.image.onload = function () { var width = neheTexture.image.width, height = neheTexture.image.height, offsetLeft = canvas.offsetLeft, offsetTop = canvas.offsetTop; gl.viewportWidth = canvas.width = width; gl.viewportHeight = canvas.height = height; canvas.addEventListener('mousemove', function (e) { drawScene((e.pageX - offsetLeft) / width, (e.pageY - offsetTop) / height); }, false); gl.bindTexture(gl.TEXTURE_2D, neheTexture); gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true); gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, neheTexture.image); 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); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR); gl.bindTexture(gl.TEXTURE_2D, null); callback(); } neheTexture.image.src = 'test.jpg'; } var cubeVertexPositionBuffer; var cubeVertexTextureCoordBuffer; function initBuffers() { cubeVertexPositionBuffer = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer); var vertices = [ -1.0, -1.0, //bl 1.0, -1.0, //br -1.0, 1.0, //tl 1.0, 1.0, //tr ]; gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW); cubeVertexPositionBuffer.itemSize = 2; cubeVertexPositionBuffer.numItems = 4; //texture cubeVertexTextureCoordBuffer = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTextureCoordBuffer); var textureCoords = [ 0.0, 0.0, //bl 1.0, 0.0, //br 0.0, 1.0, //tl 1.0, 1.0, //tr ]; gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(textureCoords), gl.STATIC_DRAW); cubeVertexTextureCoordBuffer.itemSize = 2; cubeVertexTextureCoordBuffer.numItems = 4; } function drawScene(b, s) { gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight); gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer); gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, cubeVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0); //texture gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTextureCoordBuffer); gl.vertexAttribPointer(shaderProgram.textureCoordAttribute, cubeVertexTextureCoordBuffer.itemSize, gl.FLOAT, false, 0, 0); gl.activeTexture(gl.TEXTURE0); gl.bindTexture(gl.TEXTURE_2D, neheTexture); gl.uniform1i(shaderProgram.samplerUniform, 0); //custom uniforms gl.uniform1f(shaderProgram.brightnessUniform, b || 0.5); gl.uniform1f(shaderProgram.saturationUniform, s || 0.5); //draw gl.drawArrays(gl.TRIANGLE_STRIP, 0, cubeVertexPositionBuffer.numItems); } </code></pre>
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    1. PTQuestion
    1. USDalton Tan
    1. USDalton Tan
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      1. LTLinked
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    1. COcan you post a link to a working sample somewhere?
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      1. POExtra Space in WebGL Despite Same Dimension
      1. USgman
    2. COHere's the link http://dalton.zrevision.com/webgl/ Left image is the WebGL canvas.
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      1. POExtra Space in WebGL Despite Same Dimension
      1. USDalton Tan
    3. COI tried it on both OSX and Windows in Chrome 16, FF8.0 and FF10.0. All of them look exactly the same. What os and versions are you running?
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      1. POExtra Space in WebGL Despite Same Dimension
      1. USgman
 

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