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USAndon M. Coleman
 

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    <p>My interest in Computer Graphics dates back to <a href="http://en.wikipedia.org/wiki/Active_Worlds" rel="nofollow noreferrer"><em>AlphaWorld</em> <strong><em>(1995)</em></strong></a>, the first true 3D internet-based virtual world that allowed real-time collaborative construction. In 1998, I began to dabble in <a href="http://en.wikipedia.org/wiki/OpenGL" rel="nofollow noreferrer"><em>OpenGL</em></a> and have since amassed an expert knowledge in OpenGL and Computer Graphics in general.</p> <p>Outside of Computer Graphics, I spent a great deal of my academic career working with Real-Time Safety Critical Embedded Systems based on the <a href="http://en.wikipedia.org/wiki/VxWorks" rel="nofollow noreferrer"><em>VxWorks</em></a> platform. My research has been published in a variety of fields including Machine Learning, Real-Time Operating Systems and Fault Tolerance.</p> <p>&nbsp;&nbsp;<a href="http://stackexchange.com/users/2818986"> <img src="http://stackexchange.com/users/flair/2818986.png" width="208" height="58" alt="profile for Andon M. Coleman on Stack Exchange, a network of free, community-driven Q&amp;A sites" title="profile for Andon M. Coleman on Stack Exchange, a network of free, community-driven Q&amp;A sites"> </a></p>
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      1. POHow to determine CPU and memory consumption from inside a process?
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      1. POOpenGL draws in 16 colors after changing RGBA color
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      1. POHow to send multiple parameters to the vertex shader on WebGL?
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    1. CO@jozxyqk Yeah, I do so much work with deferred shading these days I rarely give much thought to the expense of a matrix multiply in the fragment shader. It comes with the territory, you _have_ to transform the normal map out of tangent space in the fragment shader no matter what in deferred shading :) But it's only done once for the entire scene in deferred shading, so it is a nice trade-off.
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      1. PONormal Mapping and translation disrupts my lighting
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    2. COIndeed, implementation should be trivial. Half the lines of the shader are not even needed if source and destination have identical dimensions :) I do have to wonder what happens if you have 2 lights in this implementation, though. Usually you add the light terms for each light at each pixel rather than multiplying them together. If one light does not cover a pixel at all, it will multiply the previous light by 0.0...
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      1. POLight shading in the texture space in GLSL
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    3. COWe seem to be thinking of the situation in two different ways. My concern is that there is no perfect 1:1 mapping between the number of fragments on screen in his picture and the FBO texture attachment's resolution. The viewport on the left side of the screen isn't even the same aspect ratio. I'm not sure how explicitly fetching texels with `texelFetch (...)` would deliver different behaviour in such a situation? Effectively each fragment's relative area may be larger or smaller than a single texel, so you cannot have each fragment sample the texel center without inherent aliasing.
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