vgonisanz / opengl-inyect-overlay

OpenGL Inyect overlay

This project is a draft to test how create a library with GLFW OpenGL and apply over another binary bypassing glfwSwapBuffers and another functions.

Dependencies

GLFW

Install devel version. In example for Fedora:

sudo dnf install glfw-devel.x86_64

Freetype

Install freetype.

Compiling

mkdir build && cd build
cmake ..
make -j4
make install

How to use

After compile and install (default path install inside build folder) go to install path an execute them:

Concept example

This is a basic example for inyection:

• ./full: If you want to see the expected result WITHOUT inyection code. This executable shows a simple OpenGL app.
• ./binary: If you want to see the a simple OpenGL app. We will use this binary to overlay a library.
• LD_PRELOAD=./../lib/libsimpleoverlay.so ./binary: This command will inyect shared library libsimpleoverlay.so into raw binary binary. This combination shows how inyect a library to parse swapbuffers and keyboard into a GLFW app. to parse swapbuffers and keyboard into a GLFW app.

Performance

This is a simple implementation to show performance:

• LD_PRELOAD=./../lib/libperformance_overlay.so ./fakeperformancegame

Based on

Original idea from ZaneA's gist