al_create_shader - Allegro 5 API

       Create a shader object.

       The  platform  argument  is one of the ALLEGRO_SHADER_PLATFORM(3alleg5) values, and specifies the type of
       shader object to create, and which language is used to program the shader.

       The shader platform must be compatible with the type of display that you will use the shader  with.   For
       example,  you  cannot  create and use a HLSL shader on an OpenGL display, nor a GLSL shader on a Direct3D
       display.

       The ALLEGRO_SHADER_AUTO value automatically chooses the appropriate platform for  the  display  currently
       targeted by the calling thread; there must be such a display.  It will create a GLSL shader for an OpenGL
       display, and a HLSL shader for a Direct3D display.

       Returns the shader object on success.  Otherwise, returns NULL.

       al_create_shader - Allegro 5 API

al_attach_shader_source(3alleg5),     al_attach_shader_source_file(3alleg5),    al_build_shader(3alleg5),
       al_use_shader(3alleg5), al_destroy_shader(3alleg5), al_get_shader_platform(3alleg5)

Allegro reference manual                                                               al_create_shader(3alleg5)

       5.1.0

              #include <allegro5/allegro.h>

              ALLEGRO_SHADER *al_create_shader(ALLEGRO_SHADER_PLATFORM platform)