I’m a beginner with opengl.
I’m just trying to load and view an image(lena) using opengl
and want to get pixel information of image to do fft.
and also I want to see the result of fft.
I hope you teach me how load and see the image using opengl simply!
Actually, reading image files into textures is not a part of the library: there are no standard OpenGL functions that, say, take an image path and return a texture ID. So, you are to either use some helper library (which I dont recommend to beginners; but thats my personal opinion, not a thought-through maxima) or write the appropriate code yourself. Thankfully, it`s rather simple.
There is a family of functions that load data from RAM to texture memory, their names begin from glTexImage*. The function you now need is called glTexImage2D.
To provide a proper usage example, I need to know which programming language you are intending to use.
P.S.: glTexImage2D() alone won`t get you anywhere. There is some prior work to be done, like generating texture ID and making it current.