101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
#ifndef SPRITES_H
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#define SPRITES_H
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#include "vic.h"
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// initialize non virtualized sprite system, using only the eight hardware sprites
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void spr_init(char * screen);
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// set one sprite with the given attributes
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void spr_set(char sp, bool show, int xpos, int ypos, char image, char color, bool multi, bool xexpand, bool yexpand);
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// show or hide a sprite
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inline void spr_show(char sp, bool show);
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// move a sprite to the given position, only uses 8 bit y and 9 bit x
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inline void spr_move(char sp, int xpos, int ypos);
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// get current x position of sprite
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inline int spr_posx(char sp);
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// get current y position of sprite
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inline int spr_posy(char sp);
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// move a sprite to the given position, only uses 16 bit y and 16 bit x,
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// moves the sprite to a zero y position if offscreen
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void spr_move16(char sp, int xpos, int ypos);
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// change the image of a sprite
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inline void spr_image(char sp, char image);
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// change the color of a sprite
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inline void spr_color(char sp, char color);
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// The virtual sprite system works with the rasterirq library to multiplex
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// 16 virtual sprites onto the actual eight hardware sprites. It uses the slots
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// 0 to 8 of the rasterirq library to switch the sprites mid screen. The
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// application has to race the beam and call at least the vspr_update every
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// bottom of the frame to reset the top eight sprites.
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//
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// A usual frame would look like this:
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//
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// - off screen game code
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// vspr_sort();
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// - more game code
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// rirq_wait();
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// vspr_update();
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// - more raster irq stuff
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// rirq_sort();
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//
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#ifndef VSPRITES_MAX
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#define VSPRITES_MAX 16
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#endif
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// initialize the virtual (multiplexed) sprite system, offering 16 sprites
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void vspr_init(char * screen);
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// set one sprite with the given attribute
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void vspr_set(char sp, int xpos, int ypos, char image, char color);
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// move a virtual sprite
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inline void vspr_move(char sp, int xpos, int ypos);
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// change the image of a virtual sprite
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inline void vspr_image(char sp, char image);
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// change the color of a virtual sprite
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inline void vspr_color(char sp, char color);
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// hide a virtual sprite, show again by moving it into the visual range
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inline void vspr_hide(char sp);
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// sort the virtual sprites by their y-position
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void vspr_sort(void);
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// update the virtual sprites. Must be called every frame before sorting
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// the raster irq list.
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void vspr_update(void);
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#pragma compile("sprites.c")
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#endif
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