// Space Taxi -- the sprite cels the renderer needs, as a fixed-order
// bank. The offline baker (tools/staxibake) emits a .spr in this order,
// spritebake compiles it to a per-platform .spc, and stRenderPrewarm
// loads that with jlSpriteBankLoadPrecompiled -- so the moving cels
// arrive already compiled and the ~0.4 s-per-cel 65816 JIT never runs at
// boot. The game maps loaded cel i back to its (ptr, colour, mode) key
// from kStCels[i]. stCelBlob is the single expansion both the baker and
// the interpreter fallback use, so the compiled and built cels agree.

#ifndef ST_CELS_H
#define ST_CELS_H

#include <stdint.h>

// 3x3 tiles = 24x24 px; 32 bytes per 8x8 tile, tile-major (matches
// jlSpriteCreateFromSurface / the .spr cel layout).
#define ST_CEL_TILES   3u
#define ST_CEL_BYTES   (ST_CEL_TILES * ST_CEL_TILES * 32u)
#define ST_CEL_ROWS    21u        // a VIC sprite is 21 rows tall

typedef struct {
    uint8_t ptr;      // VIC sprite block pointer
    uint8_t color;    // per-sprite colour (the multicolour "10" pair)
    uint8_t multi;    // 1 = multicolour, 0 = hires
    uint8_t mc0;      // shared multicolour 0 ($D025); 0 when hires
    uint8_t mc1;      // shared multicolour 1 ($D026); 0 when hires
} StCelDefT;

extern const StCelDefT kStCels[];
extern const uint16_t  kStCelCount;

// Expand a VIC bitmap (63 bytes, 21 rows x 3, or NULL) into the 288-byte
// tile-major 4bpp-packed cel blob. Colours as in the C64 multicolour
// rules; hires uses `color` for a set bit.
void stCelBlob(const uint8_t *bm, uint8_t multi, uint8_t color, uint8_t mc0, uint8_t mc1, uint8_t *out);

#endif