Separate engine and game

game/world/tileset.c

@@ -0,0 +1,52 @@
+#include <assert.h>
+#include <stdio.h>
+
+#include "tileset.h"
+
+Tileset TILESET_INVALID = {.isValid = false};
+
+Tileset tilesetCreate(const TilesetDesc *desc) {
+    Tileset tileset = {};
+    cute_tiled_tileset_t *source = desc->source;
+
+    char pathBuffer[256];
+    // auto terminates
+    snprintf(pathBuffer, sizeof(pathBuffer), "%s%s%s",
+             desc->assetDir ? desc->assetDir : "",
+             desc->assetDir ? "/" : "",
+             source->image.ptr);
+
+    tileset.tiles = LoadTexture(pathBuffer);
+    tileset.startID = source->firstgid;
+    tileset.tileWidth = source->tilewidth;
+    tileset.tileHeight = source->tileheight;
+
+    tileset.offsetX = source->tileoffset_x;
+    tileset.offsetY = source->tileoffset_y;
+
+    tileset.width = tileset.tiles.width / tileset.tileWidth;
+    tileset.height = tileset.tiles.height / tileset.tileHeight;
+
+    if (tileset.tiles.width != source->imagewidth ||
+        tileset.tiles.height != source->imageheight) {
+        tilesetDestroy(&tileset);
+        return TILESET_INVALID;
+    }
+
+    tileset.isValid = true;
+    return tileset;
+}
+
+Rectangle tilesetGetTileRegion(Tileset *tileset, int tileID) {
+    tileID = tileID - tileset->startID;
+    int posX = tileID % tileset->width;
+    int posY = tileID / tileset->width;
+    return (Rectangle) {posX * tileset->tileWidth, posY * tileset->tileHeight,
+                        tileset->tileWidth, tileset->tileHeight};
+}
+
+void tilesetDestroy(Tileset *tileset) {
+    UnloadTexture(tileset->tiles);
+    *tileset = TILESET_INVALID;
+}
+