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POSpeeding up transform calculations
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  1. POSpeeding up transform calculations
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    copied!<p>I am programming an OpenGL3 2D Engine. Currently, I am trying to solve a bottleneck. Please hence the following output of the AMD Profiler: <a href="http://h7.abload.de/img/profilerausa.png" rel="nofollow">http://h7.abload.de/img/profilerausa.png</a></p> <p>The data was made using several thousand sprites. </p> <p>However, at 50.000 sprites the testapp is already unusable at 5 fps.</p> <p>This shows, that my bottleneck is the transform function I use. That is the corresponding function: <a href="http://code.google.com/p/nightlight2d/source/browse/NightLightDLL/NLBoundingBox.cpp#130" rel="nofollow">http://code.google.com/p/nightlight2d/source/browse/NightLightDLL/NLBoundingBox.cpp#130</a></p> <pre><code>void NLBoundingBox::applyTransform(NLVertexData* vertices) { if ( needsTransform() ) { // Apply Matrix for ( int i=0; i&lt;6; i++ ) { glm::vec4 transformed = m_rotation * m_translation * glm::vec4(vertices[i].x, vertices[i].y, 0, 1.0f); vertices[i].x = transformed.x; vertices[i].y = transformed.y; } m_translation = glm::mat4(1); m_rotation = glm::mat4(1); m_needsTransform = false; } } </code></pre> <p>I can't do that in the shader, because I am batching all sprites at once. That means, I have to use the CPU to calculate transforms. </p> <p>My Question is: What is the best way to solve this bottleneck? </p> <p>I don't use any threads atm, so when I use vsync, I get an extra performance hit too, because it waits for the screen to finish. That tells me I should use threading. </p> <p>The other way to go would be to use OpenCL maybe? I want to avoid CUDA, because as far as I know it only runs on NVIDIA cards. Is that right? </p> <p>post scriptum:</p> <p>You can download a demo here, if you like:</p> <p><a href="http://www63.zippyshare.com/v/45025690/file.html" rel="nofollow">http://www63.zippyshare.com/v/45025690/file.html</a></p> <p>Please note, that this requires VC++2008 installed, because it is a debug version for running a profiler. </p>
 

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