diff --git a/source/engine/ffi.c b/source/engine/ffi.c
index 079a012..8498a34 100644
--- a/source/engine/ffi.c
+++ b/source/engine/ffi.c
@@ -268,13 +268,11 @@ JSValue duk_cursor_text(JSContext *js, JSValueConst this, int argc, JSValueConst
 
 JSValue duk_gui_img(JSContext *js, JSValueConst this, int argc, JSValueConst *argv) {
   const char *img = JS_ToCString(js, argv[0]);
-  cpVect pos = js2vec2(argv[1]);
-  gui_draw_img(img, js2hmmv2(argv[1]), js2number(argv[2]), js2number(argv[3]));
+  gui_draw_img(img, js2hmmv2(argv[1]), js2hmmv2(argv[2]), js2number(argv[3]), js2bool(argv[4]), js2hmmv2(argv[5]), 1.0, js2color(argv[6]));
   JS_FreeCString(js, img);
   return JS_NULL;
 }
 
-
 struct nk_rect js2nk_rect(JSValue v) {
   struct nk_rect rect;
   rect.x = js2number(js_getpropstr(v, "x"));
@@ -1620,7 +1618,7 @@ void ffi_load() {
   DUK_FUNC(gui_text, 6)
   DUK_FUNC(ui_text, 5)
   DUK_FUNC(cursor_text, 5)
-  DUK_FUNC(gui_img, 2)
+  DUK_FUNC(gui_img, 10)
 
   DUK_FUNC(inflate_cpv, 3)
 
diff --git a/source/engine/script.c b/source/engine/script.c
index a6f78c3..83dc64c 100644
--- a/source/engine/script.c
+++ b/source/engine/script.c
@@ -191,6 +191,21 @@ void script_callee(struct callee c, int argc, JSValue *argv) {
   js_callee_exec(&c, argc, argv);
 }
 
+
+
+void send_signal(const char *signal, int argc, JSValue *argv)
+{
+  JSValue globalThis = JS_GetGlobalObject(js);
+  JSValue sig = JS_GetPropertyStr(js, globalThis, "Signal");
+  JSValue fn = JS_GetPropertyStr(js, sig, "call");
+  JSValue args[argc+1];
+  args[0] = str2js(signal);
+  for (int i = 0; i < argc; i++)
+    args[1+i] = argv[i];
+    
+  JS_Call(js, fn, sig, argc+1, args);
+}
+
 static struct callee update_callee;
 void register_update(struct callee c) {
   update_callee = c;
diff --git a/source/engine/script.h b/source/engine/script.h
index 291bc77..b837e3c 100644
--- a/source/engine/script.h
+++ b/source/engine/script.h
@@ -49,6 +49,8 @@ void call_gui();
 void call_nk_gui();
 void unregister_obj(JSValue obj);
 
+void send_signal(const char *signal, int argc, JSValue *argv);
+
 void register_physics(struct callee c);
 void call_physics(double dt);
 
diff --git a/source/engine/sprite.c b/source/engine/sprite.c
index 80432d9..5299535 100644
--- a/source/engine/sprite.c
+++ b/source/engine/sprite.c
@@ -25,7 +25,7 @@ static sg_bindings bind_sprite;
 
 struct sprite_vert {
   HMM_Vec2 pos;
-  struct uv_n uv;
+  HMM_Vec2 uv;
   struct rgba color;
 };
 
@@ -159,7 +159,7 @@ void sprite_initialize() {
       .layout = {
           .attrs = {
               [0].format = SG_VERTEXFORMAT_FLOAT2,
-	      [1].format = SG_VERTEXFORMAT_USHORT2N,
+	      [1].format = SG_VERTEXFORMAT_FLOAT2,
 	      [2].format = SG_VERTEXFORMAT_UBYTE4N}},
       .primitive_type = SG_PRIMITIVETYPE_TRIANGLE_STRIP,
       .label = "sprite pipeline",
@@ -213,7 +213,7 @@ void sprite_initialize() {
 }
 
 /* offset given in texture offset, so -0.5,-0.5 results in it being centered */
-void tex_draw(struct Texture *tex, HMM_Vec2 pos, float angle, HMM_Vec2 size, HMM_Vec2 offset, struct glrect r, struct rgba color) {
+void tex_draw(struct Texture *tex, HMM_Vec2 pos, float angle, HMM_Vec2 size, HMM_Vec2 offset, struct glrect r, struct rgba color, int wrap, HMM_Vec2 wrapoffset, float wrapscale) {
   struct sprite_vert verts[4];
   
   HMM_Vec2 sposes[4] = {
@@ -238,15 +238,24 @@ void tex_draw(struct Texture *tex, HMM_Vec2 pos, float angle, HMM_Vec2 size, HMM
     verts[i].pos = sposes[i];
     verts[i].color = color;
   }
+  if (!wrap) {
+    verts[0].uv.X = r.s0;
+    verts[0].uv.Y = r.t1;
+    verts[1].uv.X = r.s1;
+    verts[1].uv.Y = r.t1;
+    verts[2].uv.X = r.s0;
+    verts[2].uv.Y = r.t0;
+    verts[3].uv.X = r.s1;
+    verts[3].uv.Y = r.t0;
+  } else {
+    verts[0].uv = HMM_MulV2((HMM_Vec2){0,0}, size);
+    verts[1].uv = HMM_MulV2((HMM_Vec2){1,0}, size);
+    verts[2].uv = HMM_MulV2((HMM_Vec2){0,1}, size);
+    verts[3].uv = HMM_MulV2((HMM_Vec2){1,1}, size);
 
-  verts[0].uv.u = r.s0 * USHRT_MAX;
-  verts[0].uv.v = r.t1 * USHRT_MAX;
-  verts[1].uv.u = r.s1 * USHRT_MAX;
-  verts[1].uv.v = r.t1 * USHRT_MAX;
-  verts[2].uv.u = r.s0 * USHRT_MAX;
-  verts[2].uv.v = r.t0 * USHRT_MAX;
-  verts[3].uv.u = r.s1 * USHRT_MAX;
-  verts[3].uv.v = r.t0 * USHRT_MAX;
+    for (int i = 0; i < 4; i++)
+      verts[i].uv = HMM_AddV2(verts[i].uv, wrapoffset);
+  }
 
   bind_sprite.fs_images[0] = tex->id;
   sg_append_buffer(bind_sprite.vertex_buffers[0], SG_RANGE_REF(verts));
@@ -263,25 +272,22 @@ void sprite_draw(struct sprite *sprite) {
     cpVect cpos = cpBodyGetPosition(go->body);
     HMM_Vec2 pos = {cpos.x, cpos.y};
     HMM_Vec2 size = {sprite->size.X * go->scale * go->flipx, sprite->size.Y * go->scale * go->flipy};
-    tex_draw(sprite->tex, pos, cpBodyGetAngle(go->body), size, sprite->pos, sprite->frame, sprite->color);
+    tex_draw(sprite->tex, pos, cpBodyGetAngle(go->body), size, sprite->pos, sprite->frame, sprite->color, 0, pos, 0);
   }
 }
 
-
-
 void sprite_setanim(struct sprite *sprite, struct TexAnim *anim, int frame) {
   if (!sprite) return;
   sprite->tex = anim->tex;
   sprite->frame = anim->st_frames[frame];
 }
 
-void gui_draw_img(const char *img, HMM_Vec2 pos, float scale, float angle) {
+void gui_draw_img(const char *img, HMM_Vec2 pos, HMM_Vec2 scale, float angle, int wrap, HMM_Vec2 wrapoffset, float wrapscale, struct rgba color) {
   sg_apply_pipeline(pip_sprite);
   sg_apply_uniforms(SG_SHADERSTAGE_VS, 0, SG_RANGE_REF(hudproj));
   struct Texture *tex = texture_loadfromfile(img);
-  HMM_Vec2 size = {scale, scale};
   HMM_Vec2 offset = {0.f, 0.f};
-  tex_draw(tex, pos, 0.f, size, offset, tex_get_rect(tex), color_white);
+  tex_draw(tex, pos, angle, scale, offset, tex_get_rect(tex), color, wrap, wrapoffset, wrapscale);
 }
 
 void slice9_draw(const char *img, HMM_Vec2 pos, HMM_Vec2 dimensions, struct rgba color)
diff --git a/source/engine/sprite.h b/source/engine/sprite.h
index aeadb9d..e5c7be1 100644
--- a/source/engine/sprite.h
+++ b/source/engine/sprite.h
@@ -41,7 +41,6 @@ void sprite_draw_all();
 unsigned int incrementAnimFrame(unsigned int interval, struct sprite *sprite);
 void sprite_flush();
 
-void gui_draw_img(const char *img, HMM_Vec2 pos, float scale, float angle);
-
+void gui_draw_img(const char *img, HMM_Vec2 pos, HMM_Vec2 scale, float angle, int wrap, HMM_Vec2 wrapoffset, float wrapscale, struct rgba color);
 
 #endif
diff --git a/source/engine/texture.c b/source/engine/texture.c
index f4be237..bf1f744 100644
--- a/source/engine/texture.c
+++ b/source/engine/texture.c
@@ -77,6 +77,8 @@ struct Texture *texture_pullfromfile(const char *path) {
   tex->opts.sprite = 1;
   tex->opts.mips = 0;
   tex->opts.gamma = 0;
+  tex->opts.wrapx = 1;
+  tex->opts.wrapy = 1;
 
   int n;
   unsigned char *data = stbi_load(path, &tex->width, &tex->height, &n, 4);
@@ -133,6 +135,8 @@ struct Texture *texture_pullfromfile(const char *path) {
       .min_filter = SG_FILTER_NEAREST_MIPMAP_NEAREST,
       .mag_filter = SG_FILTER_NEAREST,
       .num_mipmaps = mips,
+      .wrap_u = SG_WRAP_REPEAT,
+      .wrap_v = SG_WRAP_REPEAT,
       .data = sg_img_data
     });
 
diff --git a/source/engine/texture.h b/source/engine/texture.h
index c37a886..f73a419 100644
--- a/source/engine/texture.h
+++ b/source/engine/texture.h
@@ -56,6 +56,8 @@ struct TextureOptions {
     int mips;
     unsigned int gamma:1;
     int animation;
+    int wrapx;
+    int wrapy;
 };
 
 /* Represents an actual texture on the GPU */
diff --git a/source/engine/window.c b/source/engine/window.c
index 8ad4505..26a4ed7 100644
--- a/source/engine/window.c
+++ b/source/engine/window.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include "ffi.h"
 
 #include "openglrender.h"
 
@@ -51,11 +52,14 @@ void window_maximize_callback(GLFWwindow *w, int maximized) {
 }
 
 void window_framebuffer_size_cb(GLFWwindow *w, int width, int height) {
-  struct window *win = winfind(w);
+  struct window *win = mainwin;
   win->width = width;
   win->height = height;
   window_makecurrent(win);
   win->render = 1;
+
+  JSValue vals[2] = { int2js(width), int2js(height) };
+  send_signal("window_resize", 2, vals);
 }
 
 void window_close_callback(GLFWwindow *w) {
@@ -66,9 +70,8 @@ struct window *MakeSDLWindow(const char *name, int width, int height, uint32_t f
   if (arrcap(windows) == 0)
     arrsetcap(windows, 5);
 
-  GLFWwindow *sharewin = mainwin == NULL ? NULL : mainwin->window;
-
-  if (sharewin) return sharewin;
+  if (mainwin != NULL)
+    return mainwin;
 
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
   glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
@@ -80,19 +83,17 @@ struct window *MakeSDLWindow(const char *name, int width, int height, uint32_t f
       .width = width,
       .height = height,
       .id = arrlen(windows),
-      .window = glfwCreateWindow(width, height, name, NULL, sharewin)};
+      .window = glfwCreateWindow(width, height, name, NULL, mainwin)};
 
   if (!w.window) {
     YughError("Couldn't make GLFW window\n", 1);
     return NULL;
   }
+  
+  mainwin = malloc(sizeof(struct window));
+  *mainwin = w;  
 
   glfwMakeContextCurrent(w.window);
-  //    int version = gladLoadGL(glfwGetProcAddress);
-  //    if (!version) {
-  //        YughError("Failed to initialize OpenGL context.");
-  //        exit(1);
-  //    }
   YughInfo("Loaded OpenGL %d.%d", 3, 3);
   glfwSwapInterval(1);
 
@@ -108,6 +109,8 @@ struct window *MakeSDLWindow(const char *name, int width, int height, uint32_t f
   if (arrlen(windows) == 1)
     mainwin = &windows[0];
 
+  window_framebuffer_size_cb(mainwin, width, height);    
+
   return &arrlast(windows);
 }
 
diff --git a/source/scripts/debug.js b/source/scripts/debug.js
index b489c2e..d69200b 100644
--- a/source/scripts/debug.js
+++ b/source/scripts/debug.js
@@ -33,6 +33,10 @@ var Debug = {
   poly(points, color) {
     cmd_points(0,points,color);
   },
+
+  boundingbox(bb, color) {
+    cmd_points(0, bb2points(bb), color);
+  },
   
   box(pos, wh, color) {
     color = color ? color : Color.white;
@@ -174,6 +178,10 @@ var DebugControls = {
   input_f1_pressed() {
     Debug.draw_phys(!Debug.phys_drawing);
   },
+
+  input_f12_pressed() {
+    GUI.defaults.debug = !GUI.defaults.debug;
+  },
 };
 
 set_pawn(DebugControls);
diff --git a/source/scripts/engine.js b/source/scripts/engine.js
index 6455c9a..6407df3 100644
--- a/source/scripts/engine.js
+++ b/source/scripts/engine.js
@@ -110,20 +110,6 @@ function set_cam(id) {
   cmd(61, id);
 };
 
-var Window = {
-  get width() {
-    return cmd(48);
-  },
-
-  get height() {
-    return cmd(49);
-  },
-  
-  get dimensions() {
-    return [this.width, this.height];
-  }
-};
-
 
 var Color = {
   white: [255,255,255,255],
@@ -172,14 +158,27 @@ var GUI = {
       return def;
     }
 
+    var tex_wh = cmd(64,def.path);
+    var wh = tex_wh.slice();
+
+    if (def.width !== 0)
+      wh.x = def.width;
+
+    if (def.height !== 0)
+      wh.y = def.height;
+
+    wh = wh.scale(def.scale);
+
+    var sendscale = [];
+    sendscale.x = wh.x / tex_wh.x;
+    sendscale.y = wh.y / tex_wh.y;
+
     def.draw = function(pos) {
       def.calc_bb(pos);
-      var wh = cmd(64,def.path);
-      gui_img(def.path, pos.sub(def.anchor.scale(wh)), def.scale, def.angle, def.color);
+      gui_img(def.path, pos.sub(def.anchor.scale(wh)), sendscale, def.angle, def.image_repeat, def.image_repeat_offset, def.color);
     };
 
     def.calc_bb = function(cursor) {
-      var wh = cmd(64,def.path).scale(def.scale);
       def.bb = cwh2bb(wh.scale([0.5,0.5]), wh);
       def.bb = movebb(def.bb, cursor.sub(wh.scale(def.anchor)));
     };
@@ -204,6 +203,9 @@ var GUI = {
     margin: [5,5], /* Distance between elements for things like columns */
     width: 0,
     height: 0,
+    image_repeat: false,
+    image_repeat_offset: [0,0],
+    debug: false, /* set to true to draw debug boxes */
   },
 
   text_fn(str, defn)
@@ -213,6 +215,9 @@ var GUI = {
     
     def.draw = function(cursor) {
       def.calc_bb(cursor);
+
+      if (def.debug)
+        Debug.boundingbox(def.bb, def.debug_colors.bounds);
       
       var old = def;
       def = Object.create(def);
@@ -254,11 +259,8 @@ var GUI = {
     });
 
     def.draw = function(pos) {
-      var c = Color.red.slice();
-      c.a = 100;
         def.items.forEach(function(item) {
 	  item.draw.call(this,pos);
-	  Debug.poly(bb2points(item.bb), c);
           var wh = bb2wh(item.bb);
           pos.y -= wh.y;
           pos.y -= def.padding.x*2;
@@ -269,6 +271,15 @@ var GUI = {
   },
 };
 
+GUI.defaults.debug_colors = {
+  bounds: Color.red.slice(),
+  margin: Color.blue.slice(),
+  padding: Color.green.slice()
+};
+
+Object.values(GUI.defaults.debug_colors).forEach(function(v) { v.a = 100; });
+
+
 function listbox(pos, item) {
   pos.y += (item[1] - 20);
 };
@@ -461,9 +472,6 @@ var Tween = {
 
   start(obj, target, tvals, options)
   {
-    var start = tvals[0];
-    var end = tvals[1];
-    
     var defn = Object.create(this.default);
     Object.assign(defn, options);
 
@@ -493,6 +501,8 @@ var Tween = {
         nval = defn.ease(nval);
 
       obj[target] = tvals[i].lerp(tvals[i+1], nval);
+
+      Log.warn(defn.pct);
     };
 
     defn.restart = function() { defn.accum = 0; };
@@ -503,6 +513,48 @@ var Tween = {
 
     return defn;
   },
+
+  embed(obj, target, tvals, options) {
+    var defn = Object.create(this.default);
+    Object.assign(defn, options);
+
+    defn.update_vals = function(vals) {
+      defn.vals = vals;
+      
+      if (defn.loop === 'circle')
+        defn.vals.push(defn.vals[0]);
+      else if (defn.loop === 'yoyo') {
+        for (var i = defn.vals.length-2; i >= 0; i--)
+          defn.vals.push(defn.vals[i]);
+      }
+
+      defn.slices = defn.vals.length - 1;
+      defn.slicelen = 1 / defn.slices;
+    };
+
+    defn.update_vals(tvals);
+
+    defn.time_s = Date.now();
+
+    Object.defineProperty(obj, target, {
+      get() {
+        defn.accum = (Date.now() - defn.time_s)/1000;
+	defn.pct = (defn.accum % defn.time) / defn.time;
+	var t = defn.whole ? defn.ease(defn.pct) : defn.pct;
+
+	var nval = t / defn.slicelen;
+	var i = Math.trunc(nval);
+	nval -= i;
+
+	if (!defn.whole)
+	  nval = defn.ease(nval);
+
+	return defn.vals[i].lerp(defn.vals[i+1],nval);
+      },
+    });
+
+    return defn;
+  },
 };
 
 
@@ -929,8 +981,33 @@ var Signal = {
   clera_obj(obj) {
     this.signals.filter(function(x) { return x[1] !== obj; });
   },
+
+  c:{},
+  register(name, fn) {
+    if (!this.c[name])
+      this.c[name] = [];
+
+    this.c[name].push(fn);
+  },
+
+  call(name, ...args) {
+    if (this.c[name])
+      this.c[name].forEach(function(fn) { fn.call(this, ...args); });
+  },
 };
 
+var Window = {
+  width: 0,
+  height: 0,
+  dimensions:[0,0],
+};
+
+Signal.register("window_resize", function(w, h) {
+  Window.width = w;
+  Window.height = h;
+  Window.dimensions = [w, h];
+});
+
 var IO = {
   exists(file) { return cmd(65, file);},
   slurp(file) {