Mirror Scene in OpenGL

Mirror Scene in OpenGL using Stencil and Object Masking.

Approach

To create a mirror in OpenGL, I have used the following approach:

1. Create a Mirror Camera UBO and Set the View Matrix to a Mirrored Version of the Main Camera's View Matrix. Formula Given (V * M * R_z * M^-1);
2. Create a Real Framebuffer Object (FBO) and Attach a Texture to it for the Real World (Visible in Real View in Display);
3. Create a Mirror Framebuffer Object (FBO) and Attach a Texture to it for the Mirrored World (Visible in Mirror View in Display);
4. Create a Mask Framebuffer Object (FBO) and Attach a Texture to it (Masking Certain Objects to not be Blurred).
5. Compose the Scene together in the Shader to be rendered as a full-quad as the Final Scene. Mirror Scene is Blurred if its not within the Mask (using Gaussian Blur).

Performance

Machine Specification : Intel Core i5-1335U, Intel Iris Xe Graphics, 16GB RAM

Scene	FPS CPU-GPU
Composed Scene	90-250