Provided by: allegro5-doc_5.2.10.1+dfsg-1build1_all 

NAME
al_get_default_shader_source - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro.h>
char const *al_get_default_shader_source(ALLEGRO_SHADER_PLATFORM platform,
ALLEGRO_SHADER_TYPE type)
DESCRIPTION
Returns a string containing the source code to Allegro’s default vertex or pixel shader appropriate for
the passed platform. The ALLEGRO_SHADER_AUTO value means GLSL is used if OpenGL is being used otherwise
HLSL. ALLEGRO_SHADER_AUTO requires that there is a current display set on the calling thread. This
function can return NULL if Allegro was built without support for shaders of the selected platform.
SINCE
5.1.6
SEE ALSO
al_attach_shader_source(3alleg5)
Allegro reference manual al_get_default_shader_source(3alleg5)