ALLEGRO_RENDER_STATE - Allegro 5 API
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#include <allegro5/allegro.h>
typedef enum ALLEGRO_RENDER_STATE {
Possible render states which can be set with
al_set_render_state(3alleg5):
- ALLEGRO_ALPHA_TEST
- If this is set to 1, the values of ALLEGRO_ALPHA_FUNCTION and
ALLEGRO_ALPHA_TEST_VALUE define a comparison function which is performed
for each pixel. Only if it evaluates to true the pixel is written.
Otherwise no subsequent processing (like depth test or blending) is
performed.
- ALLEGRO_ALPHA_FUNCTION
- One of ALLEGRO_RENDER_FUNCTION(3alleg5), only used when ALLEGRO_ALPHA_TEST
is 1.
- ALLEGRO_ALPHA_TEST_VALUE
- Only used when ALLEGRO_ALPHA_TEST is 1.
- ALLEGRO_WRITE_MASK
- This determines how the framebuffer and depthbuffer are updated whenever a
pixel is written (in case alpha and/or depth testing is enabled: after all
such enabled tests succeed). Depth values are only written if
ALLEGRO_DEPTH_TEST is 1, in addition to the write mask flag being
set.
- ALLEGRO_DEPTH_TEST
- If this is set to 1, compare the depth value of any newly written pixels
with the depth value already in the buffer, according to
ALLEGRO_DEPTH_FUNCTION. Allegro primitives with no explicit z coordinate
will write a value of 0 into the depth buffer.
- ALLEGRO_DEPTH_FUNCTION
- One of ALLEGRO_RENDER_FUNCTION(3alleg5), only used when ALLEGRO_DEPTH_TEST
is 1.