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ALLEGRO_RENDER_STATE(3) Library Functions Manual ALLEGRO_RENDER_STATE(3) NAME ALLEGRO_RENDER_STATE - Allegro 5 API SYNOPSIS #include <allegro5/allegro.h> typedef enum ALLEGRO_RENDER_STATE { DESCRIPTION Possible render states which can be set with al_set_render_state(3): ALLEGRO_ALPHA_TEST If this is set to 1, the values of ALLEGRO_ALPHA_FUNCTION and ALLE- GRO_ALPHA_TEST_VALUE define a comparison function which is performed on the alpha component of each pixel. Only if it evaluates to true the pixel is written. Otherwise no subsequent processing (like depth test or blending) is performed. This can be very useful, for example if a depth buffer is used but you do not want fully trans- parent pixels to modify it. ALLEGRO_ALPHA_FUNCTION One of ALLEGRO_RENDER_FUNCTION(3), only used when ALLEGRO_ALPHA_TEST is 1. ALLEGRO_ALPHA_TEST_VALUE Only used when ALLEGRO_ALPHA_TEST is 1. Should be a value of 0 - 255. 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 AL- LEGRO_DEPTH_FUNCTION. Allegro primitives with no explicit z coordi- nate will write a value of 0 into the depth buffer. ALLEGRO_DEPTH_FUNCTION One of ALLEGRO_RENDER_FUNCTION(3), only used when ALLEGRO_DEPTH_TEST is 1. SINCE 5.1.2 SEE ALSO al_set_render_state(3), ALLEGRO_RENDER_FUNCTION(3), ALLE- GRO_WRITE_MASK_FLAGS(3) Allegro reference manual ALLEGRO_RENDER_STATE(3)
NAME | SYNOPSIS | DESCRIPTION | SINCE | SEE ALSO
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