ALLEGRO_SHADER_TYPE(3alleg5) | ALLEGRO_SHADER_TYPE(3alleg5) |
ALLEGRO_SHADER_TYPE - Allegro 5 API
#include <allegro5/allegro.h> typedef enum ALLEGRO_SHADER_TYPE ALLEGRO_SHADER_TYPE;
Used with al_attach_shader_source(3alleg5) and al_attach_shader_source_file(3alleg5) to specify how to interpret the attached source.
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.
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).
5.1.0
Allegro reference manual |