RSGL

Riley's Simple Graphics Library

RSGL is a modular simple-to-use cross-platform graphics library. It attempts to combine the freedoms of low libraries with modern C techniques. Thus offering simplicity and convenience.

RSGL currently supports Linux, BSD, Windows and MacOS.

Build statuses

Features

• No external dependencies, all the libraries required are lightweight and bundled in
• Supports multiple platforms, Windows, MacOS, Linux, etc
• Supports multiple versions of OpenGL (even allowing you to switch during runtime)
• Basic shape drawing, collisions and drawing operations
• OpenGL abstraction layer, RGL, which can also be used independently as a single-header library
• straightforward window management via RGFW
• Supports multiple font, image and audio formats via stb_truetype.h, stb_image.h, and miniaudio.h
• Dynamic GUI Widgets via a convenient styling system
• Many examples included
• Allows you to use other libraries instead of the default RSGL backend.
• Free and Open Source

Contacts

• email : [email protected]
• discord : ColleagueRiley
• discord server : https://discord.gg/pXVNgVVbvh

Modules

RSGL-Architecture diagram

Defines

• #define RSGL_NO_WIDGETS - makes it so RSGL doesn't include widget functions
• #define RSGL_NO_AUDIO - makes it so RSGL doesn't include audio functions
• #define RSGL_NO_RGFW - This is for using a different windowing library other than RGFW. RSGL_graphics is used instead, as seen in examples/glfw.c
• #define RSGL_NO_TEXT - makes it so RSGL does not include text rendering functions
• #define RGFW_NO_WIDGETS - makes it so RSGL does not include widgets
• #define RSGL_NO_AUDIO - makes it so RSGL does not include audio functions
• #define RSGL_NO_MINIAUDIO_IMPLEMENTATION - makes it so RSGL does not link Miniaudio. You'll have to link Miniaudio yourself to use audio #define RSGL_NO_SAVE_IMAGE - makes it so RSGL does not save/load images (don't use RSGL_drawImage if you use this). This is here because RSGL_drawImage saves the file name with its loaded texture so it can load the texture when you use the same file. \

Widgets

Widgets are WIP, the supported widgets include
RSGL_alignRect, RSGL_button (checkboxes, toggle buttons, combo boxes, sliders and radio buttons) and widget containers \

RSGL_textBox and RSGL_expandableRect are currently WIP.

Using RSGL

header-only

To link RSGL you must add the line.

#define RSGL_IMPLEMENTATION

in exactly one file which includes the RSGL.h header.

You could also use the command line argument -D RSGL_IMPLEMENTATION.

Optionally, RSGL can be compiled into a .o or .so file and link it.

Compiling RSGL

Compiling RSGL isn't required. But if you want to, here's how.

make

This will compile RSGL into a static library into a shared library. You can also compile RSGL by hand.

compiling by hand

1. cp RSGL.h RSGL.c.
2. Compile the library into an object file by running gcc -c RSGL.c -fPIC.
3. After you compile the library into an object file, you can also turn the object file into a static or shared library.
4. To compile statically run ar rcs RSGL.a RSGL.o
5. To compile RSGL into a shared library, run gcc -shared RSGL.o <system libs>

  windows:
    gcc -shared RSGL.o  -lshell32 -lgdi32 -o RSGL.dll
  linux:
    gcc -shared RSGL.o -lX11 -lXcursor -o RSGL.so
  macos:
    gcc -shared RSGL.o -framework Foundation -framework AppKit -framework CoreVideo

Examples

a basic example

#define RSGL_NO_AUDIO /* RSGL uses miniaudio.h, and I don't want to compile it if I'm not using it */
#define RSGL_IMPLEMENTATION
#include "RSGL.h"

int main() {
    RSGL_window* win = RSGL_createWindow("name", RSGL_RECT(0, 0, 500, 500), RSGL_CENTER);

    bool running = true;

    while (running) {
      while (RSGL_window_checkEvent(win)) {
          if (win->event.type == RSGL_quit) {
            running = false;
            break;
          }
      }

      RSGL_drawRect((RSGL_rect){200, 200, 200, 200}, RSGL_RGB(255, 0, 0));
      RSGL_window_clear(win, RSGL_RGB(255, 255, 255));
    }

    RSGL_window_close(win);
}

This example can be compiled with :
Linux:
gcc <file.c> -lX11 -lGLX -lm -o example
Windows :
gcc <file.c> -lopengl32 -lgdi32 -lshell32 -o example
MacOS :
gcc <file.c> -lm -framework Foundation -framework AppKit -framework OpenGL -framework CoreVideo -o example

Both of the included makefiles (Makefile or examples/Makefile) use the Unlicense license so feel free to copy from either of them if you wish.

compiling

these can be compiled by running make examples in the current directory\

or by using the makefile in examples/\

The Makefile in examples/ allows you to compile all the examples using make,
compile one specific example using make <example> or
run make debug which compiles and runs each example in debug mode

basic.c

examples/basic.c is a basic example that shows many of the window managing features RSGL has
It also shows multiple ways of drawing a triangle

events.c

example/events.c is an example that shows off all the events that RSGL has and prints out their event data into the terminal

glfw.c

examples/glfw.c is an example that shows off how you can use RSGL with GLFW instead of with RGFW.

glVer.c

examples/glVer.c is an example that shows how RSGL can switch between legacy and modern OpenGL
in the example, you can toggle between OpenGL 3.0+ and OpenGL 2.0- by pressing the spacebar

shapes.c

examples/shapes.c is an example that shows off shape rendering using RSGL, the shapes rotate and switch between being filled and unfilled

text.c

examples/text.c is an example of text rendering using RSGL

textures.c

examples/textures.c is an example that shows off rendering textures on a shape, the textures switch between being enabled and disabled as the shapes spin

button.c

examples/button.c is an example that shows off how to create and manage buttons using RSGL, these include, a default style button, a checkbox, a toggle button, radio buttons, a combo box, a slider and a custom button

styles.c

examples/button.c is an example that shows off button styles, there are groups of buttons for each style. There is also a switch button that allows you to toggle dark mode.

container.c

examples/container.c is an example that shows how to create and manage a widget container

Dependencies

All of RSGL's (non-native) dependencies are built-in.

RGFW

RGFW, Riley's Graphics FrameWork.
RSGL is built off of RGFW, it handles window management for RSGL.

RGFW is a flexible, lightweight, single-header-file alternative to GLFW. \

(this is a button that leads to the RGFW repo)

RGL

RGL is an OpenGL abstraction layer (that I created), it handles OpenGl version managing and rendering.

It also allows RSGL to render using a simplified pipeline system.
RGL is heavily based on RLGL but it's designed to be more lightweight, with better performance.

RFont

RFont is a super lightweight and modular font library for text rendering that I created.

stb_image

stb_image is a public domain single header image loader library.

Miniaudio

Miniaudio is a public-domain audio playback and capture library. RSGL uses this for playing/loading audio

Miniaudio's website, https://miniaud.io/

other credits

Eima

Since I started RSGL, has helped boost the morale of the project and has helped me come up with new ideas and improvements for the project. He also contributed some code to the project.

Eima is the original creator of Silicon, without Silicon RSGL/RGFW probably would not support native macOS

License

RSGL uses the Zlib/libPNG license, this means you can use RSGL freely as long as you do not claim you wrote this software, mark altered versions as such and keep the license included with the header.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
  
1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software
   in a product, an acknowledgment in the product documentation would be
   appreciated but is not required. 
2. Altered source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.