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#ifndef STATES_WORLDGEN_H
#define STATES_WORLDGEN_H
#ifdef __cplusplus
extern "C" {
#endif
#include <daw/types.h>
// amounts to 32768 blocks per chunk
#define CHUNK_WIDTH 16
#define CHUNK_LENGTH 16
#define CHUNK_HEIGHT 128
#define CHUNK_SIZE (CHUNK_WIDTH * CHUNK_LENGTH * CHUNK_HEIGHT)
// World size is defined in terms of number of chunks. Chunks are not stacked
// vertically
#define WORLD_WIDTH 16
#define WORLD_LENGTH 16
#define WORLD_SIZE (WORLD_LENGTH * WORLD_WIDTH)
// first 5 bits for material type
#define BLOCK_none 0
#define BLOCK_dirt 1
#define BLOCK_grass 2
#define BLOCK_rock 3
#define BLOCK_ore 4
// ... Room for 32 in total
// next 4 bits for shape type
//#define SHAPE_none (0 << 4)
//#define SHAPE_slope_north (1 << 4)
//#define SHAPE_slope_east (2 << 4)
//#define SHAPE_slope_south (3 << 4)
//#define SHAPE_slope_west (4 << 4)
// ... Room for 16 in total
// 24 bits for storing neighbouring blocks
// Used for kernel operations
#define FILLED_TOP_NW (1 << 5)
#define FILLED_TOP_N (1 << 6)
#define FILLED_TOP_NE (1 << 7)
#define FILLED_TOP_W (1 << 8)
#define FILLED_TOP_C (1 << 8)
#define FILLED_TOP_E (1 << 9)
#define FILLED_TOP_SW (1 << 10)
#define FILLED_TOP_S (1 << 11)
#define FILLED_TOP_SE (1 << 12)
#define FILLED_NW (1 << 13)
#define FILLED_N (1 << 14)
#define FILLED_NE (1 << 15)
#define FILLED_W (1 << 16)
#define FILLED_C (1 << 16)
#define FILLED_E (1 << 17)
#define FILLED_SW (1 << 18)
#define FILLED_S (1 << 19)
#define FILLED_SE (1 << 20)
#define FILLED_BOT_NW (1 << 21)
#define FILLED_BOT_N (1 << 22)
#define FILLED_BOT_NE (1 << 23)
#define FILLED_BOT_W (1 << 24)
#define FILLED_BOT_C (1 << 24)
#define FILLED_BOT_E (1 << 25)
#define FILLED_BOT_SW (1 << 26)
#define FILLED_BOT_S (1 << 27)
#define FILLED_BOT_SE (1 << 28)
// 0b11111 aka. 31 or 2**5
#define FILLED_MASK_TOP (u32)(\
FILLED_TOP_NW | FILLED_TOP_N | FILLED_TOP_NE | \
FILLED_TOP_W | FILLED_TOP_C | FILLED_TOP_E | \
FILLED_TOP_SW | FILLED_TOP_S | FILLED_TOP_SE \
)
#define FILLED_MASK (u32)(\
FILLED_NW | FILLED_N | FILLED_NE | \
FILLED_W | FILLED_C | FILLED_E | \
FILLED_SW | FILLED_S | FILLED_SE \
)
#define FILLED_MASK_BOT (u32)(\
FILLED_BOT_NW | FILLED_BOT_N | FILLED_BOT_NE | \
FILLED_BOT_W | FILLED_BOT_C | FILLED_BOT_E | \
FILLED_BOT_SW | FILLED_BOT_S | FILLED_BOT_SE \
)
#define FILLED_MASK_ALL (u32)(~((1 << 5) - 1))
#define SURROUNDED(x) ((x & FILLED_MASK_ALL) == FILLED_MASK_ALL)
void gen_terrain(u32 *world);
#ifdef __cplusplus
}
#endif
#endif
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