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.TH "ALLEGRO_SHADER_TYPE" "3" "" "Allegro reference manual" ""
.SH NAME
ALLEGRO_SHADER_TYPE \- Allegro 5 API
.SH SYNOPSIS
.IP
.EX
#include \f[B]<allegro5/allegro.h>\f[R]

\f[B]typedef\f[R] \f[B]enum\f[R] ALLEGRO_SHADER_TYPE ALLEGRO_SHADER_TYPE;
.EE
.SH DESCRIPTION
Used with al_attach_shader_source(3) and al_attach_shader_source_file(3)
to specify how to interpret the attached source.
.TP
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.
.RS
.PP
When Allegro\[cq]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.
.RE
.TP
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.
.RS
.PP
With Allegro\[cq]s builtin graphics this means the shader is for example
called for each destination pixel of the output of an al_draw_bitmap(3)
call.
.PP
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).
.RE
.SH SINCE
5.1.0