loading map data from chunks rather than tilelayout

8 files changed, 153 insertions, 68 deletions

diff --git a/src/chunkedtiledmap.c b/src/chunkedtiledmap.c
index ce6be57..a3019af 100644
--- a/src/chunkedtiledmap.c
+++ b/src/chunkedtiledmap.c
@@ -2,10 +2,26 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
-#include <wchar.h>
 
 #include "chunkedtiledmap.h"
 
+const int endian = 1;
+#define is_bigendian() ( (*(char*)&endian) == 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 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))
@@ -41,17 +57,25 @@ int writeb(char * in, size_t noBytes, FILE * file) {
 }
 
 void buildChunkTree(ChunkedTiledMap *tiledMap) {
-    int noChunks;
+    // initialise chunk tree
+    tiledMap->chunkTree = NULL;
 
-    // 4 bytes for number of chunks
-    readb((char *)&noChunks, 4, tiledMap->file);
     size_t chunkSizeBytes = tiledMap->chunkWidth * tiledMap->chunkHeight;
-    for (int n = 0; n < noChunks; n++) {
+    // calculate how much space there is until the end of the file
+    // TODO save the number of chunks total to avoid having to jump around to find referenceso
+    // or just keep reading chunks until eof or other descriptor
+    long chunksStart = ftell(tiledMap->file);
+    fseek(tiledMap->file, 0, SEEK_END);
+    long totalChunksSize = ftell(tiledMap->file) - chunksStart;
+
+    fseek(tiledMap->file, chunksStart, SEEK_SET);
+
+    for (int n = 0; n < totalChunksSize; n += chunkSizeBytes + 8) {
         int x, y;
         readb((char *)&x, 4, tiledMap->file);
         readb((char *)&y, 4, tiledMap->file);
         long pointer = ftell(tiledMap->file);
-        // TODO casting to pointer here is maybe unsafe
+
         kdtree_insert(&tiledMap->chunkTree, x, y, (char *) pointer);
         fseek(tiledMap->file, chunkSizeBytes, SEEK_CUR);
     }
@@ -85,22 +109,40 @@ ChunkedTiledMap openTiledMap(char * filename) {
     tiledMap.atlasData = malloc(atlasSizeBytes);
     fread(tiledMap.atlasData, atlasSizeBytes, (size_t) 1, file);
     
+    tiledMap.tileCount = tiledMap.atlasSize[0]*tiledMap.atlasSize[1] + 1;
+
     buildChunkTree(&tiledMap);
     return tiledMap;
 }
 
+//! write a chunk to the file
+char* writeChunk(ChunkedTiledMap *tiledMap, int x, int y, char * chunk) {
+    size_t chunkSizeBytes = tiledMap->chunkWidth * tiledMap->chunkHeight;
+
+
+    long pos = (long) kdtree_search(tiledMap->chunkTree, x, y);
+
+    fseek(tiledMap->file, pos, SEEK_SET);
+    fwrite(chunk, 1, chunkSizeBytes, tiledMap->file);
+    return chunk;
+}
+
 char* loadChunk(ChunkedTiledMap tiledMap, int x, int y) {
     // TODO add caching for this
     size_t chunkSizeBytes = tiledMap.chunkWidth * tiledMap.chunkHeight;
     char * chunk = malloc(chunkSizeBytes);
 
     long pos = (long) kdtree_search(tiledMap.chunkTree, x, y);
+    // if this chunk is not indexed, return NULL
+    if (pos == 0)
+        return NULL;
+
     fseek(tiledMap.file, pos, SEEK_SET);
     fread(chunk, 1, chunkSizeBytes, tiledMap.file);
     return chunk;
 }
 
-void appendChunk(ChunkedTiledMap *tiledMap, int x, int y, char * chunk) {
+char * appendChunk(ChunkedTiledMap *tiledMap, int x, int y, char * chunk) {
     // TODO does this actually need tiledMap as a pointer
     size_t chunkSizeBytes = tiledMap->chunkWidth * tiledMap->chunkHeight;
 
@@ -108,11 +150,51 @@ void appendChunk(ChunkedTiledMap *tiledMap, int x, int y, char * chunk) {
 
     // calculate position before writing
     long pos = ftell(tiledMap->file) + 8; 
-    kdtree_insert(&tiledMap->chunkTree, x, y, chunk);
+    kdtree_insert(&tiledMap->chunkTree, x, y, (char *)pos);
 
+    int chunkx, chunky;
     writeb((char *) &x, 4, tiledMap->file);
     writeb((char *) &y, 4, tiledMap->file);
     fwrite(chunk, 1, chunkSizeBytes, tiledMap->file);
+
+    return chunk;
+}
+
+char * appendEmptyChunk(ChunkedTiledMap * tiledMap, int x, int y) {
+    char * chunk = calloc(tiledMap->chunkWidth*tiledMap->chunkHeight, 1);
+    return appendChunk(tiledMap, x, y, chunk);
+}
+
+char getChunkedTile(ChunkedTiledMap tiledMap, int x, int y) {
+    // TODO put this calculation in function
+    int inChunkX = x % tiledMap.chunkWidth;
+    int inChunkY = y % tiledMap.chunkHeight;
+    int chunkX = (x - inChunkX) / tiledMap.chunkWidth;
+    int chunkY = (y - inChunkY) / tiledMap.chunkHeight;
+
+    char * chunk = loadChunk(tiledMap, chunkX, chunkY);
+    if (chunk == NULL)
+        return 0;
+
+    char v = chunk[inChunkY * tiledMap.chunkWidth + inChunkX];
+    return v;
+}
+
+char setChunkedTile(ChunkedTiledMap * tiledMap, int x, int y, char value) {
+    int inChunkX = x % tiledMap->chunkWidth;
+    int inChunkY = y % tiledMap->chunkHeight;
+    int chunkX = (x - inChunkX) / tiledMap->chunkWidth;
+    int chunkY = (y - inChunkY) / tiledMap->chunkHeight;
+
+    char * chunk = loadChunk(*tiledMap, chunkX, chunkY);
+    if (chunk == NULL)
+        chunk = appendEmptyChunk(tiledMap, chunkX, chunkY);
+
+    chunk[inChunkY * tiledMap->chunkWidth + inChunkX] = value;
+
+    writeChunk(tiledMap, chunkX, chunkY, chunk);
+
+    return value;
 }
 
 
@@ -136,7 +218,7 @@ void writeTiledMapHeader(ChunkedTiledMap tiledMap) {
     // TODO when caching, commit everything left in cache here
 }
 
-ChunkedTiledMap newTiledMap(char * filename, Image atlas, int tileSize, int chunkWidth, int chunkHeight, int width, int height) {
+ChunkedTiledMap openNewTiledMap(char * filename, Image atlas, int tileSize, int chunkWidth, int chunkHeight, int width, int height) {
     ChunkedTiledMap tiledMap;
     tiledMap.chunkWidth = chunkWidth;
     tiledMap.chunkHeight = chunkHeight;
@@ -147,8 +229,11 @@ ChunkedTiledMap newTiledMap(char * filename, Image atlas, int tileSize, int chun
     tiledMap.atlasSize[1] = atlas.height / tileSize;
 
     tiledMap.atlasData = LoadImageColors(atlas);
+    tiledMap.tileCount = tiledMap.atlasSize[0]*tiledMap.atlasSize[1] + 1;
 
-    if (!(tiledMap.file = fopen(filename, "r+b"))) {
+    tiledMap.chunkTree = NULL;
+
+    if (!(tiledMap.file = fopen(filename, "wb"))) {
         fprintf(stderr, "Failed to load %s\n", filename);
     }
 
@@ -159,6 +244,13 @@ ChunkedTiledMap newTiledMap(char * filename, Image atlas, int tileSize, int chun
             appendChunk(&tiledMap, x, y,  chunk);
         }
     }
+    
+    // reopen the file in read+write mode
+    fclose(tiledMap.file);
+
+    if (!(tiledMap.file = fopen(filename, "r+b"))) {
+        fprintf(stderr, "Failed to load %s\n", filename);
+    }
 
     return tiledMap;
 }
@@ -169,5 +261,3 @@ void closeTiledMap(ChunkedTiledMap tiledMap) {
     fclose(tiledMap.file);
 }
 
-
-
diff --git a/src/chunkedtiledmap.h b/src/chunkedtiledmap.h
index 0d5c5d0..8bc2aaa 100644
--- a/src/chunkedtiledmap.h
+++ b/src/chunkedtiledmap.h
@@ -1,9 +1,6 @@
 #include <raylib.h>
 #include "kdtree.h"
 
-const int i = 1;
-#define is_bigendian() ( (*(char*)&i) == 0 )
-
 typedef struct ChunkedTiledMap {
     FILE * file;
     int chunkWidth;
@@ -14,3 +11,14 @@ typedef struct ChunkedTiledMap {
     Color * atlasData;
     kdtree_t * chunkTree;
 } ChunkedTiledMap;
+
+void textureFromPixels(Texture2D *texOut, Color *pixels, int width, int height);
+ChunkedTiledMap openTiledMap(char * filename);
+char * loadChunk(ChunkedTiledMap tiledMap, int x, int y);
+char getChunkedTile(ChunkedTiledMap tiledMap, int x, int y);
+char setChunkedTile(ChunkedTiledMap * tiledMap, int x, int y, char value);
+char * appendChunk(ChunkedTiledMap * tiledMap, int x, int y, char * chunk);
+void writeTiledMapHeader(ChunkedTiledMap tiledMap);
+ChunkedTiledMap openNewTiledMap(char * filename, Image atlas, int tileSize, int chunkWidth, int chunkHeight, int width, int height);
+void closeTiledMap(ChunkedTiledMap tiledMap);
+
diff --git a/src/editor.c b/src/editor.c
index eddd6ad..46afe37 100644
--- a/src/editor.c
+++ b/src/editor.c
@@ -22,7 +22,7 @@ void drawOverlay(Tiled tiled) {
 }
 
 void modifyTile(Tiled *tiled, int tile) {
-    setTiledMapTile(tiled->tiledMap, selectedTile, tile);
+    setChunkedTile(&tiled->tiledMap, selectedTile[0], selectedTile[1], tile);
     redrawTiledMap(*tiled);
 }
 
@@ -34,10 +34,10 @@ void setDrawMode(Tiled *tiled, int tile) {
 
 void handleInputs(Tiled *tiled) {
     if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT))
-        setDrawMode(tiled, getTiledMapTile(tiled->tiledMap, selectedTile) + 1);
+        setDrawMode(tiled, getChunkedTile(tiled->tiledMap, selectedTile[0], selectedTile[1]) + 1);
 
     if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT))
-        setDrawMode(tiled, getTiledMapTile(tiled->tiledMap, selectedTile) - 1);
+        setDrawMode(tiled, getChunkedTile(tiled->tiledMap, selectedTile[0], selectedTile[1]) - 1);
 
     if (IsMouseButtonPressed(MOUSE_BUTTON_MIDDLE))
         setDrawMode(tiled, 0);
@@ -59,8 +59,8 @@ void update(Tiled *tiled) {
     updateTiledCamera(tiled);
     Vector2 mousePos = GetMousePosition();
     Vector2 mapPos = translateTiledPosition(*tiled, mousePos);
-    if (mapPos.x >= 0 && mapPos.x < tiled->tiledMap.width
-        && mapPos.y >= 0 && mapPos.y < tiled->tiledMap.height) {
+    if (mapPos.x >= 0 && mapPos.x < tiled->mapSize[0]
+        && mapPos.y >= 0 && mapPos.y < tiled->mapSize[1]) {
         lastSelectedTile[0] = selectedTile[0];
         lastSelectedTile[1] = selectedTile[1];
         selectedTile[0] = mapPos.x;
@@ -69,7 +69,7 @@ void update(Tiled *tiled) {
     handleInputs(tiled);
 }
 
-TiledMap launchEditor(TiledMap tiledMap) {
+ChunkedTiledMap launchEditor(ChunkedTiledMap tiledMap) {
     SetConfigFlags(FLAG_WINDOW_RESIZABLE);
     InitWindow(SCREEN_W, SCREEN_H, "tiled");
 
@@ -92,7 +92,7 @@ TiledMap launchEditor(TiledMap tiledMap) {
     unloadTiled(&tiled);
 
     CloseWindow();
-    return tiled.tiledMap;
+    return tiledMap;
 }
 
 void printUsage(char *progname) {
@@ -104,11 +104,14 @@ int main(int argc, char *argv[]) {
     char * tiledFilePath;
     const char * atlasFilePath = NULL;
     int tileSize = 16;
-    int mapSize = 16;
+    int mapSize = 2;
+    int chunkSize = 2;
 
     int flags, opt;
-    while ((opt = getopt(argc, argv, "s:a:h")) != -1) {
+    while ((opt = getopt(argc, argv, "c:s:a:h")) != -1) {
         switch (opt) {
+            case 'c':
+                chunkSize = atoi(optarg);
             case 's':
                 mapSize = atoi(optarg);
             case 't':
@@ -123,7 +126,7 @@ int main(int argc, char *argv[]) {
 
     tiledFilePath = argv[optind];
 
-    TiledMap tiledMap;
+    ChunkedTiledMap tiledMap;
     if (access(tiledFilePath, F_OK)) {
         if (atlasFilePath == NULL) {
             fprintf(stderr, "Atlas file must be specified!\n");
@@ -131,11 +134,11 @@ int main(int argc, char *argv[]) {
         }
 
         Image atlasImage = LoadImage(atlasFilePath);
-        tiledMap = newTiledMap(atlasImage, tileSize, mapSize, mapSize);
+        tiledMap = openNewTiledMap(tiledFilePath, atlasImage, tileSize, chunkSize, chunkSize, mapSize, mapSize);
     } else {
-        tiledMap = loadTiledMap(tiledFilePath);
+        tiledMap = openTiledMap(tiledFilePath);
     }
 
-    TiledMap editedTiledMap = launchEditor(tiledMap);
-    saveTiledMap(tiledFilePath, tiledMap);
+    launchEditor(tiledMap);
+    closeTiledMap(tiledMap);
 }
diff --git a/src/kdtree.c b/src/kdtree.c
index ab5aa98..551bc5c 100644
--- a/src/kdtree.c
+++ b/src/kdtree.c
@@ -1,5 +1,9 @@
 #include "kdtree.h"
 
+void print_node(kdtree_t *tree) {
+    printf("[%d,%d] %ld\n", tree->x, tree->y, (long)tree->value); 
+}
+
 kdtree_t * kdtree_create(int x, int y, char * value) {
     kdtree_t * tree = malloc(sizeof(kdtree_t));
     tree->x = x;
diff --git a/src/kdtree.h b/src/kdtree.h
index e121442..a5c178e 100644
--- a/src/kdtree.h
+++ b/src/kdtree.h
@@ -31,3 +31,6 @@ int kdtree_fwrite(kdtree_t *root, FILE *file);
 //! read a tree from file
 int kdtree_fread(kdtree_t **root, FILE *file);
 
+//! print a single node (debug purposes)
+void print_node(kdtree_t *tree);
+
diff --git a/src/tiled.c b/src/tiled.c
index 43afa7b..f490d6a 100644
--- a/src/tiled.c
+++ b/src/tiled.c
@@ -3,6 +3,8 @@
 
 #include "tiled.h"
 
+int alpha =0;
+
 void updateCamera(Vector2 *offset, float *zoom) {
     if (IsKeyDown(KEY_UP)) offset->y += 16.0f / *zoom;
     if (IsKeyDown(KEY_DOWN)) offset->y -=  16.0f/ *zoom;
@@ -15,6 +17,7 @@ void updateCamera(Vector2 *offset, float *zoom) {
 
 void updateTiledCamera(Tiled *tiled) {
     updateCamera(&tiled->offset, &tiled->zoom);
+    alpha++;
 }
 
 
@@ -47,12 +50,11 @@ Vector2 translateTiledScreenPosition(Tiled tiled, Vector2 tiledPos) {
 
 void redrawTiledMap(Tiled tiled) {
     BeginTextureMode(tiled.tilemapTexture);
-    for (int y = 0; y < tiled.tiledMap.height; y++) {
-        for (int x = 0; x < tiled.tiledMap.width; x++) {
-            int i = (tiled.tiledMap.height - y - 1)*tiled.tiledMap.width + x;
+    for (int y = 0; y < tiled.mapSize[1]; y++) {
+        for (int x = 0; x < tiled.mapSize[0]; x++) {
+            unsigned char v = getChunkedTile(tiled.tiledMap, x, tiled.mapSize[1] - y - 1);
             Color c = (Color){ 
-                tiled.tiledMap.tilelayout[i], 
-                0, 0, 255 
+                v, 0, 0, 255 
             };
             DrawPixel(x, y, c);
         }
@@ -62,17 +64,18 @@ void redrawTiledMap(Tiled tiled) {
 }
 
 
-Tiled initTiled(TiledMap tiledMap) {
+Tiled initTiled(ChunkedTiledMap tiledMap) {
     Tiled tiled;
     tiled.tiledMap = tiledMap;
 
     tiled.offset = (Vector2) {0, 0};
     tiled.zoom = 64;
 
-    tiled.mapSize[0] = tiledMap.width;
-    tiled.mapSize[1] = tiledMap.height;
+    // TODO mapSize is obsolete, should be visible map size
+    tiled.mapSize[0] = tiledMap.chunkWidth * 20;
+    tiled.mapSize[1] = tiledMap.chunkHeight * 20;
     tiled.targetTexture = LoadRenderTexture(1, 1);
-    tiled.tilemapTexture = LoadRenderTexture(tiledMap.width, tiledMap.width);
+    tiled.tilemapTexture = LoadRenderTexture(tiled.mapSize[0], tiled.mapSize[1]);
 
     tiled.atlasSize[0] = tiledMap.atlasSize[0];
     tiled.atlasSize[1] = tiledMap.atlasSize[1];
@@ -120,29 +123,3 @@ void drawTiled(Tiled *tiled) {
             //(Vector2){0, 0},
             //WHITE);
 }
-
-int launchTiledView() {
-    SetConfigFlags(FLAG_WINDOW_RESIZABLE);
-    InitWindow(SCREEN_W, SCREEN_H, "tiled");
-
-    TiledMap tiledMap = loadTiledMap("map.tiles");
-    Tiled tiled = initTiled(tiledMap);
-
-    while (!WindowShouldClose()) {
-        updateTiledCamera(&tiled);
-
-        BeginDrawing();
-
-        ClearBackground(LIGHTGRAY);
-
-        drawTiled(&tiled);
-        DrawFPS(16, 16);
-
-        EndDrawing();
-    }
-
-    unloadTiled(&tiled);
-
-    CloseWindow();
-    return 0;
-}
diff --git a/src/tiled.h b/src/tiled.h
index 9890a72..11518e7 100644
--- a/src/tiled.h
+++ b/src/tiled.h
@@ -1,12 +1,12 @@
 #include <raylib.h>
 
-#include "tiledmap.h"
+#include "chunkedtiledmap.h"
 
 #define SCREEN_W 1280
 #define SCREEN_H 720
 
 typedef struct Tiled {
-    TiledMap tiledMap;
+    ChunkedTiledMap tiledMap;
     float zoom;
     Vector2 offset;
 
@@ -33,7 +33,7 @@ typedef struct Tiled {
 void updateTiledCamera(Tiled *tiled);
 Vector2 translateTiledPosition(Tiled tiled, Vector2 screenPos);
 Vector2 translateTiledScreenPosition(Tiled tiled, Vector2 tiledPos);
-Tiled initTiled(TiledMap tiledMap);
+Tiled initTiled(ChunkedTiledMap tiledMap);
 void drawTiled(Tiled *tiled);
 void unloadTiled(Tiled *tiled);
 void redrawTiledMap(Tiled tiled);
diff --git a/src/tiledmap.c b/src/tiledmap.c
index 69dcdaa..e274a6e 100644
--- a/src/tiledmap.c
+++ b/src/tiledmap.c
@@ -111,7 +111,7 @@ TiledMap loadTiledMap(char * filename) {
     return tiledMap;
 }
 
-TiledMap newTiledMap(Image atlas, int tileSize, int width, int height) {
+TiledMap openNewTiledMap(Image atlas, int tileSize, int width, int height) {
     TiledMap tiledMap;
     tiledMap.width = width;
     tiledMap.height = height;