1  #ifndef _TILE_FUNCS_H
 2  #define _TILE_FUNCS_H
 3  
 4  #include "pico/types.h"
 5  
 6  typedef enum {
 7  	TILESIZE_8 = 0,
 8  	TILESIZE_16
 9  } tilesize_t;
10  
11  // Dubiously-erased function type for fill loops (cast out before calling):
12  typedef void (*tile_loop_t)(void *dst, const void *tileset, uint x0, uint x1);
13  
14  // Rather than defining the pixel format, the tilebg object has a function
15  // pointer to a pixel fill loop appropriate for the format and tile size.
16  //
17  // The asm fill loops are specialised for format (as well as tile size), are
18  // pretty large, and live in RAM. If we dispatched those loops dynamically,
19  // the references to all the loops would prevent their link-time garbage
20  // collection, wasting RAM we would rather use for sprite/tile assets.
21  // Instead, the creator of the tilebg object explicitly adds references to
22  // the appropriate fill routine symbols when configuring the tilebgs.
23  
24  typedef struct tilebg {
25  	uint16_t xscroll;
26  	uint16_t yscroll;
27  	const void *tileset;
28  	const uint8_t *tilemap;
29  	uint8_t log_size_x;
30  	uint8_t log_size_y;
31  	tilesize_t tilesize;
32  	tile_loop_t fill_loop;
33  } tilebg_t;
34  
35  // ----------------------------------------------------------------------------
36  // Functions from tile.S
37  
38  // Signature of fill loops of a given pixel size:
39  typedef void (*tile16_loop_t)(uint16_t *dst, const uint16_t *tileset, uint x0, uint x1);
40  typedef void (*tile8_loop_t)(uint8_t *dst, const uint8_t *tileset, uint x0, uint x1);
41  
42  void tile16_16px_alpha_loop(uint16_t *dst, const uint16_t *tileset, uint x0, uint x1);
43  void tile16_16px_loop(uint16_t *dst, const uint16_t *tileset, uint x0, uint x1);
44  
45  // ----------------------------------------------------------------------------
46  // Functions from tile.c
47  
48  void tile16(uint16_t *scanbuf, const tilebg_t *bg, uint raster_y, uint raster_w);
49  
50  
51  
52  #endif