GitHub - study-game-engines/runara: Minimal & fast 2D rendering engine

Runara is a simple, well documented, bloatless 2D graphics library

Runara aims to be as small and as fast as possible. The code is contained in ~1.4k lines of code that feature a complete batch rendering system, glyph loading with freetype, text shaping with harfbuzz, a glyph caching system and much more.

Features

Efficient batch rendering system
Support for shader operations like rounded corners
Comple text rendering & loading engine
Extensivly documented functions & structures
Support for loading & rendering images
No global or hidden state
Built to make extending & modifing as straightforward as possible
Small and readable codebase

Example using GLFW

#include <GL/gl.h>
#include <GLFW/glfw3.h>
#include <runara/runara.h>

RnState state;

void resizecb(GLFWwindow* window, int w, int h) {
  rn_resize_display(&state, w, h);
}

int main() {
  glfwInit();

  GLFWwindow* window = glfwCreateWindow(1280, 720, "Hello, World!", NULL, NULL);

  glfwSetFramebufferSizeCallback(window, resizecb);

  glfwMakeContextCurrent(window);

  // Initialize your state of the library
  state = rn_init(1280, 720, (RnGLLoader)glfwGetProcAddress);

  // Loading some fonts
  RnFont heading = rn_load_font(&state, "./Lora-Italic.ttf", 36);
  RnFont paragraph = rn_load_font(&state, "./Lora-Italic.ttf", 24);

  while(!glfwWindowShouldClose(window)) {
    glClear(GL_COLOR_BUFFER_BIT);
    glClearColor(0.1f, 0.1f, 0.1f, 1.0f);

    // Beginning a rende pass with Runara
    rn_begin(&state);

    // Rendering some text with one font
    rn_text_render(&state, "Hello, runara!", &heading, (vec2s){20, 20}, RN_WHITE);

    // Render some text with another font
    rn_text_render(&state, "Hey There!\nThis is a paragraph.", &paragraph, (vec2s){20, 70}, RN_WHITE);

    // Rendering a basic rectangle
    rn_rect_render(&state, (vec2s){20, 130}, (vec2s){200, 100}, RN_RED);

    // Ending the render pass
    rn_end(&state);

    // External application or game code can still run perfectly fine
    // here.

    glfwPollEvents();
    glfwSwapBuffers(window);
  }
}

Building and installing

Make sure you have those build dependencies installed before installing Ruanra:

Dependencies

freetype, harfbuzz, gl, make, gcc

After installing the dependencies just run:

Documentation

For documentation of the library, just take a look at the Runara header file where every function is well documented. This is in my opinion the best approach to documenting as it is straightly bound to actually deleloping with the library.