SiftGPU | GPU implementation of David Lowe | GPU library

I'm trying to use cv::FindFundamentalMat but when I try to get the 4th argument (that should be :

Output array of N elements, every element of which is set to 0 for outliers and to 1 for the other points. The array is computed only in the RANSAC and LMedS methods. For other methods, it is set to all 1’s. )

It only gives me 0's.
I'm using siftGPU to generate the keypoints (x,y) that are used in the function.

My code :

I'm using hessgpu for efficiently compute hessian-affine SIFT descriptors using GPUs.

In this project, Devil is used for reading images: if SiftGPU::RunSIFT(const char *imgpath) is called (implemented here), then ilLoadImage is used in GLTexImage.cpp for reading images (as RGB images).

However, in my project I use cv::imread to read images. The project provides SiftGPU::RunSIFT(int width, int height, const void * data, unsigned int gl_format, unsigned int gl_type) to compute descriptors from data provided directly from the user.

So I tried: