OpenGLFFT

Features

• Foward and inverse fast fourier transform
• Can do FFT on an image of any resolution (depends on the configuration, restrictions listed below)
• Can load/save images of .jpg and .png format
• Will work with R, RG, RGB and RGBA images
• Power spectrum generation
• CLI interface
• Runs on optimized GPU Compute shaders

How to use

OpenGLFFT -input "path_to_image" [-real "path_to_image"] [-imaginary "path_to_image"] [-spectrum "path_to_image"] [-inverse "path_to_image"]

• -input path to the image you want to do FFT on
• -real path where the real component will be saved (optional)
• -imaginary path where the imaginary component will be saved (optional)
• -spectrum path where the power spectrum will be saved (optional)
• -inverse path where IFFT will be saved (optional)

All input and output images must have either .jpg or .png extension

Configuration and restrictions

All of the restrictions are tied to following configurations:

• WORKGROUP_SIZE_X this must be power of two and not bigger than N / 2 (where in this case N would be max(roundUpToPoT(width), roundUpToPoT(height)))
• SHARED_BUFFER_SIZE size of the shared buffer's. This affects the maximum resoultion of an image you can do FFT on
• PIXEL_BUFFER_SIZE local array that stores pixel data. This cannot be smaller than N / 2 / WORKGROUP_SIZE_X

All of these defines are in FFT2D.comp (in this configuration the shader code is located here)

Dependencies

• GLFW
• GLAD (included)
• stbi_image (included)
• stbi_image_write (included)