A game engine for top-down 2D RPG games.
rpg
game-engine
raylib
c99
Halve tile struct size from 6 bytes to 3 bytes
+47
-41
+17
-12
include/keraforge/world.h
+17
-12
include/keraforge/world.h
···
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11
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#define KF_TILE_SIZE_PX 16
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-
#define KF_TILEID_MAX UINT16_MAX
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+
#define KF_TILE_IDWIDTH 10
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#define KF_TILE_DATAWIDTH 4
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+
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#define KF_TILEID_MAX (1023) /* 2^10-1 */
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/* Used to store tile IDs. Stored in 10 bits; max value is 1023! */
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typedef u16 kf_tileid_t;
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/* Used to store connectivity variant. */
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typedef u16 kf_tiledatum_t;
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/* Used to store connectivity variant. Stored in 4 bits; max value is 15! */
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typedef u8 kf_tiledatum_t;
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struct kf_actor; /* Forward declaration */
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-
#define KF_TILEMASK_NORTH (0x0001)
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#define KF_TILEMASK_WEST (0x0010)
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#define KF_TILEMASK_EAST (0x0100)
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-
#define KF_TILEMASK_SOUTH (0x1000)
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#define KF_TILEMASK_NORTH (0b0001)
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#define KF_TILEMASK_WEST (0b0010)
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#define KF_TILEMASK_EAST (0b0100)
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#define KF_TILEMASK_SOUTH (0b1000)
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/* Represents a singular tile in the world. */
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struct kf_tile
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{
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kf_tileid_t subid;
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kf_tileid_t id;
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kf_tiledatum_t data;
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};
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kf_tileid_t subid : KF_TILE_IDWIDTH;
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kf_tileid_t id : KF_TILE_IDWIDTH;
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kf_tiledatum_t data : KF_TILE_DATAWIDTH;
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} __attribute__((packed));
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/* Represents a world (or a subworld, often called "rooms"). */
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struct kf_world
···
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size_t kf_world_getsize(struct kf_world *world);
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/* Get the sprite offset for a given tile datum. */
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struct kf_vec2(u32) kf_getspritefortilebitmask(kf_tiledatum_t t);
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struct kf_vec2(u32) kf_getspritefordatum(kf_tiledatum_t t);
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/* Update a tile and optionally its neighbours. */
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void kf_world_updatetile(struct kf_world *world, u32 x, u32 y, bool update_neighbours);
+1
-1
src/input.c
+1
-1
src/input.c
···
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}
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kf_inputbinds.count++;
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kf_logdbg("add keybind: %d: %s (k=%d a=%d m=%d g=%d x=%d)", i, id, key, alt, mouse, gamepad, axis);
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// kf_logdbg("add keybind: %d: %s (k=%d a=%d m=%d g=%d x=%d)", i, id, key, alt, mouse, gamepad, axis);
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kf_inputbinds.id[i] = id;
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kf_inputbinds.key[i] = key;
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kf_inputbinds.alt[i] = alt;
+1
-2
src/main.c
+1
-2
src/main.c
···
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selected_tile = t->id;
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DrawRectangleLines(select.x * KF_TILE_SIZE_PX, select.y * KF_TILE_SIZE_PX, KF_TILE_SIZE_PX, KF_TILE_SIZE_PX, WHITE);
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struct kf_vec2(u32) s = kf_getspritefortilebitmask(t->data);
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DrawText(TextFormat("%d [0x%04x] (%d,%d) {%d,%d}", t->id, t->data, select.x, select.y, s.x, s.y), select.x * KF_TILE_SIZE_PX, select.y * KF_TILE_SIZE_PX - 10, 10, BLACK);
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DrawText(TextFormat("%d [%d] (%d,%d)", t->id, t->data, select.x, select.y), select.x * KF_TILE_SIZE_PX, select.y * KF_TILE_SIZE_PX - 10, 10, BLACK);
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}
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player->draw(world, player);
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EndMode2D();
+28
-26
src/world.c
+28
-26
src/world.c
···
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w = x-1 >= world->width ? 0 : kf_world_gettile(world, x-1, y)->id,
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e = x+1 >= world->width ? 0 : kf_world_gettile(world, x+1, y)->id,
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s = y+1 >= world->height ? 0 : kf_world_gettile(world, x, y+1)->id;
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t->data = 0x0000;
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t->data = 0b0000;
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if (t->id == n) t->data |= KF_TILEMASK_NORTH;
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if (t->id == w) t->data |= KF_TILEMASK_WEST;
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if (t->id == e) t->data |= KF_TILEMASK_EAST;
···
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}
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inline
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struct kf_vec2(u32) kf_getspritefortilebitmask(kf_tiledatum_t t)
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struct kf_vec2(u32) kf_getspritefordatum(kf_tiledatum_t t)
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{
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switch (t)
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{
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case 0x0000: return (struct kf_vec2(u32)){0, 3}; /* 0x0000: */
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case 0x0001: return (struct kf_vec2(u32)){0, 2}; /* 0x0001: N */
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case 0x0010: return (struct kf_vec2(u32)){3, 3}; /* 0x0010: W */
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case 0x0011: return (struct kf_vec2(u32)){3, 2}; /* 0x0011: NW */
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case 0x0100: return (struct kf_vec2(u32)){1, 3}; /* 0x0100: E */
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case 0x0101: return (struct kf_vec2(u32)){1, 2}; /* 0x0101: EN */
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case 0x0110: return (struct kf_vec2(u32)){2, 3}; /* 0x0110: EW */
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case 0x0111: return (struct kf_vec2(u32)){2, 2}; /* 0x0111: EWN */
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case 0x1000: return (struct kf_vec2(u32)){0, 0}; /* 0x1000: S */
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case 0x1001: return (struct kf_vec2(u32)){0, 1}; /* 0x1001: SN */
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case 0x1010: return (struct kf_vec2(u32)){3, 0}; /* 0x1010: SW */
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case 0x1011: return (struct kf_vec2(u32)){3, 1}; /* 0x1011: SWN */
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case 0x1100: return (struct kf_vec2(u32)){1, 0}; /* 0x1100: SE */
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case 0x1101: return (struct kf_vec2(u32)){1, 1}; /* 0x1101: SEN */
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case 0x1110: return (struct kf_vec2(u32)){2, 0}; /* 0x1110: SEW */
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case 0x1111: return (struct kf_vec2(u32)){2, 1}; /* 0x1111: NESW */
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}
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KF_UNREACHABLE("invalid bitmask: 0x%x", t);
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return (struct kf_vec2(u32)){-1, -1};
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static const
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struct kf_vec2(u32) v[] = {
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{0, 3}, /* 0b0000: */
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{0, 2}, /* 0b0001: N */
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{3, 3}, /* 0b0010: W */
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{3, 2}, /* 0b0011: NW */
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{1, 3}, /* 0b0100: E */
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{1, 2}, /* 0b0101: EN */
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{2, 3}, /* 0b0110: EW */
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{2, 2}, /* 0b0111: EWN */
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{0, 0}, /* 0b1000: S */
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{0, 1}, /* 0b1001: SN */
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{3, 0}, /* 0b1010: SW */
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{3, 1}, /* 0b1011: SWN */
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{1, 0}, /* 0b1100: SE */
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{1, 1}, /* 0b1101: SEN */
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{2, 0}, /* 0b1110: SEW */
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{2, 1}, /* 0b1111: NESW */
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};
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return v[t];
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}
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struct kf_tile *kf_world_gettile(struct kf_world *world, u32 x, u32 y)
···
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for (x = sx ; x < ex ; x++)
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{
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KF_SANITY_CHECK(tile->subid <= kf_tiles.count, "erroneous subtile on map at %u,%u: %u (count=%u)", x, y, tile->subid, kf_tiles.count);
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/* 0x1111: full tile, no subtile rendering needed */
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KF_SANITY_CHECK(tile->id <= kf_tiles.count, "erroneous tile on map at %u,%u: %u (count=%u)", x, y, tile->id, kf_tiles.count);
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if ((tile->data != 0x1111 || kf_tiles.transparent[tile->id]) && tile->subid && tile->id)
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/* 15: full tile, no subtile rendering needed (unless transparent) */
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if ((tile->data != 15 || kf_tiles.transparent[tile->id]) && tile->subid && tile->id)
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{
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kf_drawsprite_wh(
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kf_tiles.sheet[tile->subid],
···
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kf_tiles.sprite[tile->subid].y + 1
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);
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}
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+
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if (tile->id)
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{
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-
struct kf_vec2(u32) s = kf_getspritefortilebitmask(tile->data);
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struct kf_vec2(u32) s = kf_getspritefordatum(tile->data);
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kf_drawsprite_wh(
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kf_tiles.sheet[tile->id],
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x*KF_TILE_SIZE_PX,
···
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kf_tiles.sprite[tile->id].y + s.y
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);
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}
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+
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tile++; /* shift tile pointer to the right */
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}
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tile += down; /* shift tile pointer down */