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# FBGL Framebuffer Emulator
Professional LD_PRELOAD-based framebuffer emulator with clean architecture.
## Structure
- `fbgl_preload.h` - Public header with configuration and types
- `fbgl_preload.c` - Implementation with hook functions
- `sdl_viewer.c` - SDL-based viewer application
## Features
- Clean struct-based state management
- Proper header/source separation
- Statistics tracking
- Error handling
- FPS counter in viewer
## Building
```bash
make
```
Or manually:
```bash
gcc -shared -fPIC -o libfbgl_preload.so fbgl_preload.c -ldl
gcc -o sdl_viewer sdl_viewer.c $(pkg-config --cflags --libs sdl2)
```
## Usage
Terminal 2:
```bash
LD_PRELOAD=./libfbgl_preload.so ./your_fbgl_program
```
Terminal 1:
```bash
./fbgl_viewer
```
## Architecture
1. Hook library intercepts framebuffer syscalls
2. Redirects to shared memory segment
3. SDL viewer displays shared memory contents
4. Program thinks it's using real /dev/fb0
## Configuration
Edit `fbgl_preload.h` to change:
- Screen resolution (FBGL_WIDTH, FBGL_HEIGHT)
- Color depth (FBGL_BPP)
- Shared memory key (FBGL_SHM_KEY)
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