1ALLEGRO_SHADER_TYPE(3)                                  ALLEGRO_SHADER_TYPE(3)
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NAME

6       ALLEGRO_SHADER_TYPE - Allegro 5 API
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SYNOPSIS

9              #include <allegro5/allegro.h>
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11              typedef enum ALLEGRO_SHADER_TYPE ALLEGRO_SHADER_TYPE;
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DESCRIPTION

14       Used     with     al_attach_shader_source(3)     and    al_attach_shad‐
15       er_source_file(3) to specify how to interpret the attached source.
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17       ALLEGRO_VERTEX_SHADER
18              A vertex shader is executed for each vertex  it  is  used  with.
19              The program will output exactly one vertex at a time.
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21              When  Allegro's  graphics are being used then in addition to all
22              vertices of primitives from the  primitives  addon,  each  drawn
23              bitmap also consists of four vertices.
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25       ALLEGRO_PIXEL_SHADER
26              A  pixel shader is executed for each pixel it is used with.  The
27              program will output exactly one pixel at a time - either in  the
28              backbuffer or in the current target bitmap.
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30              With Allegro's builtin graphics this means the shader is for ex‐
31              ample called for each destination pixel  of  the  output  of  an
32              al_draw_bitmap(3) call.
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34              A  more  accurate term for pixel shader would be fragment shader
35              since one final pixel in the target bitmap  is  not  necessarily
36              composed  of only a single output but of multiple fragments (for
37              example when multi-sampling is being used).
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SINCE

40       5.1.0
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44Allegro reference manual                                ALLEGRO_SHADER_TYPE(3)