Wrong result when using OpenGL for GPGPU computing

• LearnOpenGL

  624 10,261 3.8 C++

  Code repository of all OpenGL chapters from the book and its accompanying website https://learnopengl.com

Hi everyone, currently, I am trying to do compute with OpenGL using fragment shader based on this tutorial: http://www.mathematik.tu-dortmund.de/~goeddeke/gpgpu/tutorial.html as my GPU does not support compute shader. My code logic is to draw a rectangle and transfer data from array X and array Y in the form of texture then attach the color buffer to framebuffer and read it back. However, the result I receive is very weird, and I don't know how to fix it.The shader header file is from this OpenGL tutorial: https://github.com/JoeyDeVries/LearnOpenGL/blob/master/includes/learnopengl/shader_m.h

• apitrace

  8 2,529 7.5 C++

  Tools for tracing OpenGL, Direct3D, and other graphics APIs

  

You have several tools, this can be done by printing debug messages using extensions such as KHR_debug, or using specific tools which will inject themselves between your OpenGL calls and your driver such as apitrace or RenderDoc. I recommend running your program in RenderDoc regularly even if everything seems to work fine as it may help you catch some subtle bugs.

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