From 12a53d83e062fc7ec5838c94d575b94a7310d6cd Mon Sep 17 00:00:00 2001
From: davidovski <david@davidovski.xyz>
Date: Mon, 10 Jul 2023 01:46:56 +0100
Subject: add tile atlas to mapfile

---
 src/tiled.c     |  6 +++---
 src/tiledfile.c | 61 ++++++++++++++++++++++++++++++++++++++++-----------------
 src/tiledfile.h |  2 +-
 3 files changed, 47 insertions(+), 22 deletions(-)

(limited to 'src')

diff --git a/src/tiled.c b/src/tiled.c
index 2cb1cb0..b679e3c 100644
--- a/src/tiled.c
+++ b/src/tiled.c
@@ -6,16 +6,16 @@
 #define SCREEN_W 1280
 #define SCREEN_H 720
 
-const int atlasSize[2] = {2, 2};
 
 int main() {
     InitWindow(SCREEN_W, SCREEN_H, "tiled");
 
     Shader shader = LoadShader(0, "tiled.glsl");
 
-    Texture2D tilemap = loadTileMap("map.tiles");
+    int atlasSize[2] = {0, 0};
+    Texture2D tilemap, atlas; 
+    loadTileMap("map.tiles", &tilemap, &atlas, atlasSize);
 
-    Texture atlas = LoadTexture("atlas.png");
     RenderTexture2D target = LoadRenderTexture(SCREEN_W, SCREEN_H);
 
     float resolution[2] = {SCREEN_W, SCREEN_H};
diff --git a/src/tiledfile.c b/src/tiledfile.c
index c1ba42e..0b37bae 100644
--- a/src/tiledfile.c
+++ b/src/tiledfile.c
@@ -5,8 +5,9 @@
 const int i = 1;
 #define is_bigendian() ( (*(char*)&i) == 0 )
 
-Texture2D processTilemapTexture(int * tilelayout, int width, int height) {
+void processTilemapTexture(Texture2D *loc, int * tilelayout, int width, int height) {
     Color *pixels = (Color*) malloc(width * height * sizeof(Color));
+    printf("%d x %d\n", width, height);
 
     for (int y = 0; y < height; y++) {
         for (int x = 0; x < width; x++) {
@@ -25,14 +26,32 @@ Texture2D processTilemapTexture(int * tilelayout, int width, int height) {
         .mipmaps = 1
     };
 
-    Texture2D checked = LoadTextureFromImage(checkedIm);
+    *loc = LoadTextureFromImage(checkedIm);
     UnloadImage(checkedIm);
 
-    return checked;
 }
 
+void readrgba(Texture2D *loc, int width, int height, FILE *file) {
+    char *pixels = malloc(width*height*4);
+    printf("%d\n", width*height*4);
+    fread(pixels, (size_t) width*height*4, (size_t) 1, file);
+
+    Image checkedIm = {
+        .data = pixels,
+        .width = width,
+        .height = height,
+        .format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8,
+        .mipmaps = 1
+    };
+
+    *loc = LoadTextureFromImage(checkedIm);
+    UnloadImage(checkedIm);
+
+}
+
+
 //! read a big endian bytes from file
-int readb(char *out, size_t noBytes, FILE *file) {
+int readb(char * out, size_t noBytes, FILE * file) {
     if (!fread(out, (size_t)1, (size_t) noBytes, file))
         return 1;
 
@@ -51,11 +70,11 @@ int readb(char *out, size_t noBytes, FILE *file) {
 }
 
 
-Texture2D loadTileMap(char *filename) {
-    int width, height, tilebytes;
-    int *tilelayout;
+void loadTileMap(char * filename, Texture2D * tilemap, Texture2D * atlas, int * atlasSize) {
+    int width, height, tilebytes, tilesize, atlasWidth, atlasHeight;
+    int * tilelayout;
 
-    FILE *file;
+    FILE * file;
 
     file = fopen(filename, "rb");
     // skip header 
@@ -64,17 +83,23 @@ Texture2D loadTileMap(char *filename) {
     readb((char *)&width, 4, file);
     // 4 bytes for int height
     readb((char *)&height, 4, file);
-    // 1 byte saying how big each tile is
+    // 4 bytes saying how big each tile is
     readb((char *)&tilebytes, 4, file);
-    printf("tilebytes: %d\n", tilebytes);
 
+    fprintf(stderr, "loading %d bytes per tile for %d tiles\n", tilebytes, width*height);
     tilelayout = malloc(width*height*tilebytes);
-    int tile;
-    for (int y = 0; y < height; y++) {
-        for (int x = 0; x < width; x++) {
-            readb((char *)&tile, tilebytes, file);
-            tilelayout[y*width + x] = tile;
-        }
-    }
-    return processTilemapTexture(tilelayout, width, height);
+    fread(tilelayout, tilebytes, width*height, file);
+    processTilemapTexture(tilemap, tilelayout, width, height);
+
+    // read the pixel size of each tile
+    readb((char *)&tilesize, 4, file);
+    // read the atlas size
+    readb((char *)&atlasWidth, 4, file);
+    readb((char *)&atlasHeight, 4, file);
+    atlasSize[0] = atlasWidth;
+    atlasSize[1] = atlasHeight;
+
+    // read the atlas itself
+    readrgba(atlas, atlasWidth * tilesize, atlasHeight * tilesize, file);
+    fprintf(stderr, "Successfully loaded tilemap from %s\n", filename);
 }
diff --git a/src/tiledfile.h b/src/tiledfile.h
index cf2980b..02342b3 100644
--- a/src/tiledfile.h
+++ b/src/tiledfile.h
@@ -1,3 +1,3 @@
 #include <raylib.h>
 
-Texture2D loadTileMap(char *filename);
+void loadTileMap(char * filename, Texture2D * tilemap, Texture2D * atlas, int * atlasSize);
-- 
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