3 files changed, 164 insertions, 0 deletions
diff --git a/src/tiled.c b/src/tiled.c
new file mode 100644
index 0000000..2cb1cb0
--- /dev/null
+++ b/src/tiled.c
@@ -0,0 +1,81 @@
+#include <raylib.h>
+#include <stdio.h>
+
+#include "tiledfile.h"
+
+#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");
+
+    Texture atlas = LoadTexture("atlas.png");
+    RenderTexture2D target = LoadRenderTexture(SCREEN_W, SCREEN_H);
+
+    float resolution[2] = {SCREEN_W, SCREEN_H};
+    float offset[2] = {0, 0};
+    float zoom = 16.0f;
+    int mapSize[2] = {tilemap.width, tilemap.height};
+
+
+    int resolutionLoc = GetShaderLocation(shader, "resolution");
+    int locationLoc = GetShaderLocation(shader, "offset");
+    int zoomLoc = GetShaderLocation(shader, "zoom");
+
+    int atlasSizeLoc = GetShaderLocation(shader, "atlasSize");
+    int mapSizeLoc = GetShaderLocation(shader, "mapSize");
+
+    int textureLoc = GetShaderLocation(shader, "texture1");
+    int tilemapLoc = GetShaderLocation(shader, "texture2");
+
+    while (!WindowShouldClose()) {
+		if (IsKeyDown(KEY_UP)) offset[1] += zoom * 0.01f;
+		if (IsKeyDown(KEY_DOWN)) offset[1] -= zoom * 0.01f;
+		if (IsKeyDown(KEY_RIGHT)) offset[0] -= zoom * 0.01f;
+		if (IsKeyDown(KEY_LEFT)) offset[0] += zoom * 0.01f;
+
+		if (IsKeyDown(KEY_W)) zoom -= zoom * 0.01f;
+		if (IsKeyDown(KEY_S)) zoom += zoom * 0.01f;
+
+        SetShaderValue(shader, resolutionLoc, resolution, SHADER_UNIFORM_VEC2);
+        SetShaderValue(shader, locationLoc, &offset, SHADER_UNIFORM_VEC2);
+        SetShaderValue(shader, zoomLoc, &zoom, SHADER_UNIFORM_FLOAT);
+
+        SetShaderValue(shader, atlasSizeLoc, &atlasSize, SHADER_UNIFORM_IVEC2);
+        SetShaderValue(shader, mapSizeLoc, &tilemap.width, SHADER_UNIFORM_IVEC2);
+
+        BeginDrawing();
+
+        ClearBackground(LIGHTGRAY);
+
+        BeginTextureMode(target);
+            DrawRectangle(0, 0, SCREEN_W, SCREEN_H, BLACK);
+        EndTextureMode();
+
+        BeginShaderMode(shader);
+            SetShaderValueTexture(shader, textureLoc, atlas);
+            SetShaderValueTexture(shader, tilemapLoc, tilemap);
+
+            // draw the base image to texture0
+            DrawTexture(target.texture, 0, 0, WHITE);
+        EndShaderMode();
+
+            DrawText(TextFormat("FPS: %d", GetFPS()), 12, 12, 24, DARKGRAY);
+
+        EndDrawing();
+    }
+
+    UnloadShader(shader);
+    UnloadRenderTexture(target);
+    UnloadTexture(atlas);
+
+    CloseWindow();
+
+    return 0;
+}
diff --git a/src/tiledfile.c b/src/tiledfile.c
new file mode 100644
index 0000000..c1ba42e
--- /dev/null
+++ b/src/tiledfile.c
@@ -0,0 +1,80 @@
+#include <raylib.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+const int i = 1;
+#define is_bigendian() ( (*(char*)&i) == 0 )
+
+Texture2D processTilemapTexture(int * tilelayout, int width, int height) {
+    Color *pixels = (Color*) malloc(width * height * sizeof(Color));
+
+    for (int y = 0; y < height; y++) {
+        for (int x = 0; x < width; x++) {
+            int tile = tilelayout[y*width + x];
+            pixels[y*width + x] = (Color){
+                (int) tile, 0, 0, 0
+            };
+        }
+    }
+
+    Image checkedIm = {
+        .data = pixels,
+        .width = width,
+        .height = height,
+        .format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8,
+        .mipmaps = 1
+    };
+
+    Texture2D checked = LoadTextureFromImage(checkedIm);
+    UnloadImage(checkedIm);
+
+    return checked;
+}
+
+//! 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;
+}
+
+
+Texture2D loadTileMap(char *filename) {
+    int width, height, tilebytes;
+    int *tilelayout;
+
+    FILE *file;
+
+    file = fopen(filename, "rb");
+    // skip header 
+    fseek(file, 10, SEEK_CUR);
+    // 4 bytes for int width
+    readb((char *)&width, 4, file);
+    // 4 bytes for int height
+    readb((char *)&height, 4, file);
+    // 1 byte saying how big each tile is
+    readb((char *)&tilebytes, 4, file);
+    printf("tilebytes: %d\n", tilebytes);
+
+    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);
+}
diff --git a/src/tiledfile.h b/src/tiledfile.h
new file mode 100644
index 0000000..cf2980b
--- /dev/null
+++ b/src/tiledfile.h
@@ -0,0 +1,3 @@
+#include <raylib.h>
+
+Texture2D loadTileMap(char *filename);