NAME

       ALLEGRO_SHADER_TYPE - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              typedef enum ALLEGRO_SHADER_TYPE ALLEGRO_SHADER_TYPE;

DESCRIPTION

       Used  with  al_attach_shader_source(3alleg5)  and al_attach_shader_source_file(3alleg5) to specify how to
       interpret the attached source.

       ALLEGRO_VERTEX_SHADER
              A vertex shader is executed for each vertex it is used with.  The program will output exactly  one
              vertex at a time.

              When  Allegro's  graphics  are  being used then in addition to all vertices of primitives from the
              primitives addon, each drawn bitmap also consists of four vertices.

       ALLEGRO_PIXEL_SHADER
              A pixel shader is executed for each pixel it is used with.  The program will  output  exactly  one
              pixel at a time - either in the backbuffer or in the current target bitmap.

              With  Allegro's  builtin graphics this means the shader is for example called for each destination
              pixel of the output of an al_draw_bitmap(3alleg5) call.

              A more accurate term for pixel shader would be fragment shader since one final pixel in the target
              bitmap  is not necessarily composed of only a single output but of multiple fragments (for example
              when multi-sampling is being used).

SINCE

       5.1.0