Initial commit

src/engine/tilemap.h

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+#ifndef JNR_TILEMAP_H
+#define JNR_TILEMAP_H
+
+#include <SDL2/SDL.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <math.h>
+#include "config.h"
+#include "util/vec2.h"
+
+/* Forward declarations */
+typedef struct Camera Camera;
+
+typedef enum TileFlag {
+    TILE_SOLID    = 1 << 0,
+    TILE_PLATFORM = 1 << 1,    /* one-way, passable from below  */
+    TILE_LADDER   = 1 << 2,
+    TILE_HAZARD   = 1 << 3,    /* spikes, lava, etc.            */
+    TILE_WATER    = 1 << 4,
+} TileFlag;
+
+typedef struct TileDef {
+    uint16_t tex_x, tex_y;     /* position in tileset (in tiles) */
+    uint32_t flags;
+} TileDef;
+
+/* Entity spawn entry read from .lvl files */
+typedef struct EntitySpawn {
+    char     type_name[32];    /* e.g. "grunt", "flyer"          */
+    float    x, y;             /* world position (pixels)        */
+} EntitySpawn;
+
+typedef struct Tilemap {
+    int          width, height;     /* map size in tiles          */
+    uint16_t    *bg_layer;          /* background tile IDs        */
+    uint16_t    *collision_layer;   /* solid geometry tile IDs    */
+    uint16_t    *fg_layer;          /* foreground decoration IDs  */
+    TileDef      tile_defs[MAX_TILE_DEFS];
+    int          tile_def_count;
+    SDL_Texture *tileset;
+    int          tileset_cols;      /* columns in tileset image   */
+    Vec2         player_spawn;
+    float        gravity;           /* level gravity (px/s^2), 0 = use default */
+    char         music_path[ASSET_PATH_MAX]; /* level music file path          */
+    SDL_Color    bg_color;          /* background clear color                  */
+    bool         has_bg_color;      /* true if BG_COLOR was set                */
+    char         parallax_far_path[ASSET_PATH_MAX];  /* far bg image path     */
+    char         parallax_near_path[ASSET_PATH_MAX]; /* near bg image path    */
+    EntitySpawn  entity_spawns[MAX_ENTITY_SPAWNS];
+    int          entity_spawn_count;
+} Tilemap;
+
+bool     tilemap_load(Tilemap *map, const char *path, SDL_Renderer *renderer);
+void     tilemap_render_layer(const Tilemap *map, const uint16_t *layer,
+                              const Camera *cam, SDL_Renderer *renderer);
+bool     tilemap_is_solid(const Tilemap *map, int tile_x, int tile_y);
+uint32_t tilemap_flags_at(const Tilemap *map, int tile_x, int tile_y);
+void     tilemap_free(Tilemap *map);
+
+/* World-pixel to tile coordinate helpers */
+static inline int world_to_tile(float world_coord) {
+    return (int)floorf(world_coord / TILE_SIZE);
+}
+
+static inline float tile_to_world(int tile_coord) {
+    return (float)(tile_coord * TILE_SIZE);
+}
+
+#endif /* JNR_TILEMAP_H */