From 7069bfb303e86354406c94d59e1e2e47f126c984 Mon Sep 17 00:00:00 2001
From: lvntky <klevent1903@gmail.com>
Date: Mon, 18 Nov 2024 22:45:57 +0300
Subject: initial

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+# fbgl: Lightweight 2D Framebuffer Library for Linux
+
+`fbgl` (Framebuffer Graphics Library) is a minimalistic, **header-only** 2D framebuffer library written in C. Designed for simplicity and performance, `fbgl` provides an intuitive API for directly manipulating the Linux framebuffer device (`/dev/fb0`). Whether you're experimenting with low-level graphics or building lightweight graphical applications, `fbgl` offers the foundation you need.
+
+---
+
+## Features
+
+- **Header-only design**: Include `fbgl.h` and start coding.
+- **Direct framebuffer rendering**: Writes directly to `/dev/fb0` for high performance.
+- **Simple API**: Easy-to-use functions for initializing, clearing, and drawing.
+- **Lightweight**: Minimal dependencies, using only standard Linux libraries.
+- **Custom rendering**: Draw pixels, lines, and shapes directly to the framebuffer.
+
+---
+
+## Getting Started
+
+### Prerequisites
+
+- A Linux-based system with framebuffer support.
+- Development tools like GCC.
+- Access to `/dev/fb0` (requires elevated permissions or proper user configuration).
+
+### Installation
+
+No installation is required! Simply copy the `fbgl.h` file into your project directory and include it in your source files.
+
+```c
+#include "fbgl.h"
+```
+
+---
+
+## Usage
+
+### Example Program
+
+Here’s a simple program that initializes the framebuffer, clears it to a blue color, and draws a red diagonal line.
+
+```c
+#include <stdio.h>
+#include "fbgl.h"
+
+int main() {
+    // Initialize the framebuffer
+    if (fbgl_init("/dev/fb0") != 0) {
+        fprintf(stderr, "Failed to initialize framebuffer\n");
+        return 1;
+    }
+
+    printf("Framebuffer size: %dx%d\n", fbgl_get_width(), fbgl_get_height());
+
+    // Clear framebuffer to blue
+    fbgl_clear(0x0000FFFF); // Blue color
+
+    // Draw a red diagonal line
+    for (int i = 0; i < fbgl_get_width() && i < fbgl_get_height(); i++) {
+        fbgl_put_pixel(i, i, 0xFFFF0000); // Red
+    }
+
+    // Wait for user input before exiting
+    getchar();
+
+    // Clean up
+    fbgl_destroy();
+    return 0;
+}
+```
+
+Compile the program:
+
+```bash
+gcc -o example main.c
+```
+
+Run the program with elevated permissions to access `/dev/fb0`:
+
+```bash
+sudo ./example
+```
+
+---
+
+## API Reference
+
+### Initialization and Cleanup
+
+#### `int fbgl_init(const char *device);`
+Initializes the framebuffer.
+
+- **Parameters**:  
+  `device`: Path to the framebuffer device (e.g., `/dev/fb0`).
+
+- **Returns**:  
+  `0` on success, `-1` on failure.
+
+#### `void fbgl_destroy(void);`
+Destroys the framebuffer and releases resources.
+
+---
+
+### Drawing Functions
+
+#### `void fbgl_clear(uint32_t color);`
+Fills the entire framebuffer with a specified color.
+
+- **Parameters**:  
+  `color`: 32-bit ARGB color (e.g., `0xFFFF0000` for red).
+
+#### `void fbgl_put_pixel(int x, int y, uint32_t color);`
+Sets a pixel at the specified position to the given color.
+
+- **Parameters**:  
+  `x, y`: Pixel coordinates.  
+  `color`: 32-bit ARGB color.
+
+---
+
+### Utility Functions
+
+#### `int fbgl_get_width(void);`
+Returns the width of the framebuffer in pixels.
+
+#### `int fbgl_get_height(void);`
+Returns the height of the framebuffer in pixels.
+
+---
+
+## How It Works
+
+1. **Framebuffer Device**: `fbgl` uses the Linux framebuffer device (`/dev/fb0`) to directly access the screen memory.
+2. **Memory Mapping**: The framebuffer is mapped into user-space memory using `mmap`, allowing for direct pixel manipulation.
+3. **Direct Rendering**: Pixels are written directly to the framebuffer, bypassing higher-level graphics APIs.
+
+---
+
+## Limitations
+
+- **Platform-specific**: Works only on Linux systems with framebuffer support.
+- **Root permissions**: Access to `/dev/fb0` often requires `sudo`.
+- **No hardware acceleration**: Rendering is done in software, so performance depends on CPU speed.
+
+---
+
+## Roadmap
+
+Future improvements for `fbgl` may include:
+- Support for double buffering.
+- More advanced drawing primitives (e.g., circles, filled polygons).
+- Cross-platform abstraction for non-Linux systems.
+- Text rendering using bitmap fonts.
+- Performance optimizations for large resolutions.
+
+---
+
+## Contributing
+
+Contributions are welcome! If you’d like to improve `fbgl`, add features, or fix bugs:
+1. Fork the repository.
+2. Create a new branch for your changes.
+3. Submit a pull request with a clear description of your updates.
+
+---
+
+## License
+
+`fbgl` is licensed under the MIT License. See the `LICENSE` file for details.
+
+---
+
+## Acknowledgments
+
+- Inspired by the simplicity of low-level graphics programming.
+- Thanks to the Linux community for making framebuffer programming accessible!
+
+---
+
+## Contact
+
+If you have questions or suggestions, feel free to reach out via GitHub or email.
+
+Happy coding with `fbgl`! 🚀
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