1 files changed, 155 insertions, 0 deletions
diff --git a/src/tiledmap.c b/src/tiledmap.c
new file mode 100644
index 0000000..69dcdaa
--- /dev/null
+++ b/src/tiledmap.c
@@ -0,0 +1,155 @@
+#include <raylib.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "tiledmap.h"
+
+const int i = 1;
+#define is_bigendian() ( (*(char*)&i) == 0 )
+
+void textureFromPixels(Texture2D *texOut, Color *pixels, int width, int height) {
+    Image checkedIm = {
+        .data = pixels,
+        .width = width,
+        .height = height,
+        .format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8,
+        .mipmaps = 1
+    };
+
+    *texOut = LoadTextureFromImage(checkedIm);
+}
+
+//! read rgba image from file
+void readrgba(Texture2D *loc, int width, int height, FILE *file) {
+    Color *pixels = malloc(width*height*4);
+    fread(pixels, (size_t) width*height*4, (size_t) 1, file);
+    textureFromPixels(loc, pixels, width, height);
+}
+
+
+
+//! write a big endian bytes from file
+int writeb(char * in, size_t noBytes, FILE * file) {
+    if (!is_bigendian()) {
+        int tmp;
+        // reverse byte order
+        for(int i = 0; i < noBytes/2; i++) {
+            tmp = in[i];
+            in[i] = in[noBytes-i-1];
+            in[noBytes-i-1] = tmp;
+        }
+        
+    }
+
+    return fwrite(in, (size_t)1, (size_t) noBytes, file);
+}
+
+//! read a big endian bytes from file
+int readb(char * out, size_t noBytes, FILE * file) {
+    if (!fread(out, (size_t)1, (size_t) noBytes, file))
+        return 1;
+
+    if (is_bigendian()) 
+        return 0;
+
+    int tmp;
+    // reverse byte order
+    for(int i = 0; i < noBytes/2; i++) {
+        tmp = out[i];
+        out[i] = out[noBytes-i-1];
+        out[noBytes-i-1] = tmp;
+    }
+
+    return 0;
+}
+
+char getTiledMapTile(TiledMap tiledMap, int pos[2]) {
+    return tiledMap.tilelayout[pos[1]*tiledMap.width + pos[0]];
+}
+
+void setTiledMapTile(TiledMap tiledMap, int pos[2], char tile) {
+    tiledMap.tilelayout[pos[1]*tiledMap.width + pos[0]] = tile;
+}
+
+//! load tilemap data from file
+TiledMap loadTiledMap(char * filename) {
+    TiledMap tiledMap;
+    FILE * file;
+
+    if (!(file = fopen(filename, "rb"))) {
+        fprintf(stderr, "Failed to load %s\n", filename);
+        return tiledMap;
+    }
+
+    // skip header 
+    fseek(file, 10, SEEK_CUR);
+    // 4 bytes for int width
+    readb((char *)&tiledMap.width, 4, file);
+    // 4 bytes for int height
+    readb((char *)&tiledMap.height, 4, file);
+
+    size_t layoutSize = tiledMap.width*tiledMap.height;
+    tiledMap.tilelayout = malloc(layoutSize);
+    fread(tiledMap.tilelayout, layoutSize, 1, file);
+
+    // read the pixel size of each tile
+    readb((char *)&tiledMap.tileSize, 4, file);
+
+    // read the atlas size
+    readb((char *)&tiledMap.atlasSize[0], 4, file);
+    readb((char *)&tiledMap.atlasSize[1], 4, file);
+
+    // read the atlas itself
+    size_t atlasSizeBytes = tiledMap.atlasSize[0]*tiledMap.tileSize*tiledMap.atlasSize[1]*tiledMap.tileSize*4;
+    tiledMap.atlasData = malloc(atlasSizeBytes);
+    fread(tiledMap.atlasData, atlasSizeBytes, (size_t) 1, file);
+
+    tiledMap.tileCount = tiledMap.atlasSize[0]*tiledMap.atlasSize[1] + 1;
+
+    fclose(file);
+    return tiledMap;
+}
+
+TiledMap newTiledMap(Image atlas, int tileSize, int width, int height) {
+    TiledMap tiledMap;
+    tiledMap.width = width;
+    tiledMap.height = height;
+    tiledMap.tilelayout = malloc(width * height);
+
+    tiledMap.tileSize = tileSize;
+
+    tiledMap.atlasSize[0] = atlas.width / tileSize;
+    tiledMap.atlasSize[1] = atlas.height / tileSize;
+
+    tiledMap.atlasData = LoadImageColors(atlas);
+
+    return tiledMap;
+}
+
+void saveTiledMap(char * filename, TiledMap tiledMap) {
+    FILE * file;
+
+    if (!(file = fopen(filename, "wb"))) {
+        fprintf(stderr, "Failed to load %s\n", filename);
+        return;
+    }
+    size_t layoutSize = tiledMap.width*tiledMap.height;
+    size_t atlasSizeBytes = tiledMap.atlasSize[0]*tiledMap.tileSize*tiledMap.atlasSize[1]*tiledMap.tileSize*4;
+
+    fwrite("TILEFILEv2", 10, 1, file);
+
+    writeb((char *) &tiledMap.width, 4, file);
+    writeb((char *) &tiledMap.height, 4, file);
+    
+    fwrite(tiledMap.tilelayout, 1, layoutSize, file);
+
+    writeb((char *) &tiledMap.tileSize, 4, file);
+    writeb((char *) &tiledMap.atlasSize[0], 4, file);
+    writeb((char *) &tiledMap.atlasSize[1], 4, file);
+
+    fwrite(tiledMap.atlasData, 1, atlasSizeBytes, file);
+
+    fclose(file);
+    fprintf(stderr, "Written tiledfiled to %s\n", filename);
+}