instanced_font_rendering

This is a tiny font rendering library originally based on Shikoba. ( https://github.com/Queatz/Shikoba )

Depends on libmymath. ( https://github.com/Yours3lf/libmymath )

Depends on Freetype. ( http://www.freetype.org/ )

The demo needs SFML ( http://sfml-dev.org/ ) and GLEW ( http://glew.sourceforge.net/ ) to run.

For usage example see main.cpp

Building:

mkdir build

cd build

cmake -DCMAKE_BUILD_TYPE=Release ..

make

Running: ./instanced_font_rendering

Please note that you need to provide a font file here: resources/font.ttf

Performance of the demo on my PC (A8-4500m apu): 1.06-1.09 ms

In visual studio set build type to Release to enjoy full speed. In visual studio set the instance font rendering project to the default startup project to be able to debug it.

Example:

//load in the shaders with your method, get_shader() gives you a ref to the shader program 
load_shader( font::get().get_shader(), GL_VERTEX_SHADER, "../shaders/font/font.vs" ); 
load_shader( font::get().get_shader(), GL_FRAGMENT_SHADER, "../shaders/font/font.ps" ); 

uvec2 screen = uvec2( 1280, 720 );

font_inst instance; //this holds your font type and the corresponding sizes
font::get().resize( screen ); //set screen size
font::get().load_font( "../resources/font.ttf", //where your font is
                       instance, //font will load your font into this instance
                       22 ); //the font size

vec3 color = vec3( 0.5, 0.8, 0.5 ); //rgb [0...1]
vec2 pos = vec2( 10, 20 ); //in pixels

std::wstring text = L"hello world\n"; //what to display

rendering:
while(true) //your ordinary rendering loop
{
  clear_screen();
  //...
  //optionally bind fbo here to render to texture
  //...
  vec2 lastpos;
  lastpos = font::get().add_to_render_list( text + L"_", instance, vec4(color, 1), pos  ); //feed the font
  lastpos = font::get().add_to_render_list( L"blablabla", instance, vec4(1, 0, 0, 1), lastpos  ); //feed the font
  
  //kick off all fonts, all sizes, all colors, all positions at ONCE (ie. you should do this once per frame)
  font::get().render(); 
  //...
  swap_buffers();
}