56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
//---
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// visible: Component for visible entities with a sprite
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//
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// Visible entities (which must also be physical in order to have a position)
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// mostly consist of 2D sprites that either lie flat on the ground or stand
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// vertically. They also have a visual elevation (z) which only affects the
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// display, and can drop shadows.
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//
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// Below is a schematic diagram of visible objects' geometry.
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//
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// |-_
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// | `-_ z
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// | `. | y
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// ^--- :-_ | < Wall |_.-`
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// z | : `-_ | sprite `-_
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// | : `: x
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// v--- :_.-``-:
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// _.-``-_ :`-_
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// `-_ `x_ :_.-` < Floor sprite
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// `-_ _.-``
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// `
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//
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// The "x" marks the entity's anchor, which is the point of the object tied to
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// its position (which is used for depth ordering among other things). The
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// anchor is aligned with the sprite's anchor, before optionally adding a z
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// displacement for elevated visible entities.
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//---
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#pragma once
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#include "comp/entity.h"
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#include "geometry.h"
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#include "anim.h"
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typedef struct
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{
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/* Display elevation; has no influence on mechanics */
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fixed_t z;
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/* Current sprite */
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anim_state_t anim;
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/* Priority of current sprite (used to avoid animation conflicts) */
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uint8_t anim_priority;
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/* Sprite plane (either VERTICAL or HORIZONTAL) */
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uint8_t sprite_plane;
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/* Size of shadow cast (0 for no shadow; not all values are valid) */
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uint8_t shadow_size;
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} visible_t;
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/* Set the entity's animation. If the priority is strictly lower than the
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current animation's priority, this operation is ignored. */
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void visible_set_anim(entity_t *e, anim_t const *anim, int priority);
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/* Regular update function */
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void visible_update(entity_t *e, fixed_t dt);
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