diff --git a/Makefile b/Makefile
index 11f4a5f7..cc660cef 100755
--- a/Makefile
+++ b/Makefile
@@ -200,6 +200,9 @@ endif
 all: $(NAME)
 	cp -f $(NAME) $(APP)$(EXT)
 
+$(APP): $(NAME)
+	cp -f $(NAME) $(APP)
+
 $(NAME): $(OBJS) $(DEPS)
 	@echo Linking $(NAME)
 	$(CROSS)$(LD) $^ $(CPPFLAGS) $(LDFLAGS) -L. $(LDPATHS) $(LDLIBS) -o $@
@@ -282,6 +285,9 @@ clean:
 docs: doc/prosperon.org
 	make -C doc
 	mv doc/html .
+  
+api: $(APP)
+	./prosperon run 'for (var i in globalThis) say(i)' | xargs -I {} ./prosperon api {} > docs/api/{}.md
 
 TAGINC != find . -name "*.[chj]"
 tags: $(TAGINC)
diff --git a/docs/api/spline.md b/docs/api/spline.md
deleted file mode 100644
index 36ccaa47..00000000
--- a/docs/api/spline.md
+++ /dev/null
@@ -1,10 +0,0 @@
-# spline
-#### catmull()
-
-
-
-#### bezier()
-
-
-
-
diff --git a/docs/api/vector.md b/docs/api/vector.md
deleted file mode 100644
index 07fe45fd..00000000
--- a/docs/api/vector.md
+++ /dev/null
@@ -1,14 +0,0 @@
-# vector
-#### dot()
-
-
-
-#### project()
-
-
-
-#### inflate()
-
-
-
-
diff --git a/scripts/engine.js b/scripts/engine.js
index 129f0eab..cd21e97c 100644
--- a/scripts/engine.js
+++ b/scripts/engine.js
@@ -241,24 +241,9 @@ function use(file, env = {}, script) {
 use.cache = {};
 
 global.check_registers = function (obj) {
-  if (typeof obj.update === "function")
-    obj.timers.push(Register.update.register(obj.update.bind(obj)));
-
-  if (typeof obj.physupdate === "function")
-    obj.timers.push(Register.physupdate.register(obj.physupdate.bind(obj)));
-
-  if (typeof obj.draw === "function")
-    obj.timers.push(Register.draw.register(obj.draw.bind(obj), obj));
-
-  if (typeof obj.debug === "function")
-    obj.timers.push(Register.debug.register(obj.debug.bind(obj)));
-
-  if (typeof obj.gui === "function")
-    obj.timers.push(Register.gui.register(obj.gui.bind(obj)));
-
-  if (typeof obj.screengui === "function")
-    obj.timers.push(Register.screengui.register(obj.screengui.bind(obj)));
-
+  for (var reg in Register.registries)
+    if (typeof obj[reg] === 'function')
+      obj.timers.push(Register.registries[reg].register(obj[reg].bind(obj)));
   for (var k in obj) {
     if (!k.startswith("on_")) continue;
     var signal = k.fromfirst("on_");
@@ -363,11 +348,7 @@ function process() {
   }
   var st = profile.now();
   prosperon.window_render(window.size);
-  prosperon.draw();
-  prosperon.debug();
-  prosperon.gui();
-  prosperon.screengui();
-  prosperon.hookend?.();
+  prosperon.render();
   profile.addreport(profcache, "render frame", st);
   frames.push(profile.secs(profile.now() - startframe));
   if (frames.length > 20) frames.shift();
@@ -558,7 +539,7 @@ which returns a function that, when invoked, cancels the registry.
 var Register = {
   registries: [],
 
-  add_cb(name) {
+  add_cb(name, e_event = false) {
     var n = {};
     var fns = [];
 
@@ -579,19 +560,19 @@ var Register = {
     };
 
     Register[name] = n;
-    Register.registries.push(n);
+    Register.registries[name] = n;
 
     return n;
   },
 };
 
-Register.add_cb("appupdate");
-Register.add_cb("update").doc = "Called once per frame.";
-Register.add_cb("physupdate");
-Register.add_cb("gui");
-Register.add_cb("debug");
-Register.add_cb("draw");
-Register.add_cb("screengui");
+Register.add_cb("appupdate", true);
+Register.add_cb("update", true).doc = "Called once per frame.";
+Register.add_cb("physupdate", true);
+Register.add_cb("gui", true);
+Register.add_cb("hud", true);
+Register.add_cb("debug", true);
+Register.add_cb("draw", true);
 
 var Event = {
   events: {},
@@ -643,8 +624,7 @@ function world_start() {
 
 global.mixin("scripts/physics");
 global.mixin("scripts/widget");
-
-globalThis.mum = app.spawn("scripts/mum");
+global.mixin("scripts/mum");
 
 window.title = `Prosperon v${prosperon.version}`;
 window.size = [500, 500];
diff --git a/scripts/gui.js b/scripts/gui.js
index 7ebe1046..e41b5bb0 100644
--- a/scripts/gui.js
+++ b/scripts/gui.js
@@ -164,16 +164,6 @@ Mum.button = Mum.text._int.extend({
  action() { console.warn("Button has no action."); },
 });
 
-var mumcam = {};
-mumcam.transform = os.make_transform();
-mumcam.ortho = true;
-mumcam.near = 0;
-mumcam.far = 1000;
-mumcam.transform.pos = [100,100,-100];
-mumcam.app = true;
-
-var textssbo = render.text_ssbo();
-
 Mum.window = Mum.extend({
   start() {
     this.wh = [this.width, this.height];
@@ -190,10 +180,7 @@ Mum.window = Mum.extend({
       if (item.hide) return;
       item.draw(pos.slice(),this);
     }, this);
-    render.set_camera(mumcam);
-    render.setpipeline(render.textshader.pipe);
-    render.shader_apply_material(render.textshader);
-    var bind = render.sg_bind(render.textshader, shape.quad, {text:render.font.texture}, textssbo);
+    
     bind.inst = render.flushtext();
     render.spdraw(bind);
     gui.scissor_win();
@@ -243,12 +230,13 @@ Mum.column = Mum.extend({
   },
 });
 
+/*
 Mum.debug_colors = {
   bounds: Color.red.slice(),
   margin: Color.blue.slice(),
   padding: Color.green.slice()
-};
+};*/
 
-Object.values(Mum.debug_colors).forEach(function(v) { v.a = 100; });
+//Object.values(Mum.debug_colors).forEach(function(v) { v.a = 100; });
 
-return { Mum };
+//return { Mum };
diff --git a/scripts/mum.js b/scripts/mum.js
index 4442773d..5ad3f775 100644
--- a/scripts/mum.js
+++ b/scripts/mum.js
@@ -1,21 +1,107 @@
+globalThis.mum = {};
 var panel;
 
-self.screengui = function()
-{
-  if (panel) panel.gui();
+mum.base = {
+  padding:[0,0], /* Each element inset with this padding on all sides */
+  offset:[0,0],
+  pos: [0,0],
+  font: "fonts/c64.ttf",
+  selectable: false,
+  selected: false,
+  font_size: 16,
+  text_align: "left", /* left, center, right */
+  scale: 1,
+  angle: 0,
+  anchor: [0,1],
+  background_image: null,
+  hovered: {},
+  text_shadow: {
+    pos: [0,0],
+    color: Color.white,
+  },
+  text_outline: 1, /* outline in pixels */
+  color: Color.white,
+  margin: [0,0], /* Distance between elements for things like columns */
+  width: null,
+  height: null,
+  max_width: Infinity,
+  max_height: Infinity,
+  image_repeat: false,
+  image_repeat_offset: [0,0],
+  debug: false, /* set to true to draw debug boxes */
+  hide: false,
 }
 
-self.prompt = function(msg = "prompt", value = "", list = [], cb = function() {})
+var post = function() {};
+var posts = [];
+
+var context = mum.base;
+var contexts = [];
+
+var cursor = [0,0];
+
+var end = function()
 {
-  console.info(`creating popup`);
-  panel = Object.create(listpanel);
-  panel.title = msg;
-  panel.value = value;
-  panel.allassets = list;
-  panel.action = function() {
-    cb(panel.value);
-    panel = undefined;
-  }
-  panel.start();
-  player[0].control(panel);
+  post();
+  context = contexts.pop();
+  if (!context) context = mum.base;
+}
+
+var listpost = function()
+{
+  var height = 0;
+  if (context.height) height += context.height;
+  else height += (context.bb.t - context.bb.b);
+  cursor.y -= height;
+  cursor.y -= context.padding.y; 
+}
+
+var pre = function(data)
+{
+  if (data.hide || context.hide) return true;
+  data.__proto__ = context;
+  contexts.push(context);
+  context = data;
+}
+
+mum.list = function(fn, data = {})
+{
+  if (pre(data)) return;
+  
+  cursor = context.pos;
+  cursor = cursor.add(context.offset);
+  posts.push(post);
+  post = listpost;
+  
+  fn();
+  post = posts.pop();
+  end();
+}
+
+mum.image = function(path, data = {})
+{
+  if (pre(data)) return;
+  
+  var tex = game.texture(path);
+  context.bb = render.image(tex, cursor, context.size);
+  
+  end();
+}
+
+mum.button = function(str, data = {padding:[4,4]})
+{
+  if (pre(data)) return;
+  var bb = render.text(str, cursor.add(context.padding), context.size, context.color);
+  render.rectangle([bb.l-context.padding.x, bb.b-context.padding.y], [bb.r+context.padding.y, bb.t+context.padding.y], Color.black);
+  context.bb = bb;
+  end();
+}
+
+mum.label = function(str, data = {})
+{
+  if (pre(data)) return;
+  render.set_font(data.font, data.font_size);
+  context.bb = render.text(str, cursor, context.size, context.color);
+  
+  end();
 }
\ No newline at end of file
diff --git a/scripts/render.js b/scripts/render.js
index 3faed566..a5170b73 100644
--- a/scripts/render.js
+++ b/scripts/render.js
@@ -361,11 +361,13 @@ render.device.doc = `Device resolutions given as [x,y,inches diagonal].`;
 var textshader;
 var circleshader;
 var polyshader;
+var slice9shader;
 
 render.init = function() {
   textshader = render.make_shader("shaders/text_base.cg");
   render.spriteshader = render.make_shader("shaders/sprite.cg");
   render.postshader = render.make_shader("shaders/simplepost.cg");
+  slice9shader = render.make_shader("shaders/9slice.cg");
   circleshader = render.make_shader("shaders/circle.cg");
   polyshader = render.make_shader("shaders/poly.cg");
   
@@ -498,20 +500,27 @@ render.window = function(pos, wh, color) {
 };
 
 render.text = function(str, pos, size = 1, color = Color.white, wrap = -1, anchor = [0,1], cursor = -1) {
+  
   var bb = render.text_size(str, size, wrap);
-  var w = bb.r*2;
-  var h = bb.t*2;
+  var w = (bb.r - bb.l);
+  var h = (bb.t - bb.b);
   
   //render.text draws with an anchor on top left corner
   var p = pos.slice();
+  bb.r += pos.x;
+  bb.l += pos.x;
+  bb.t += pos.y;
+  bb.b += pos.y;
+  gui.text(str, p, size, color, wrap, cursor);
+  return bb;
+  
   p.x -= w * anchor.x;
   bb.r += (w*anchor.x);
   bb.l += (w*anchor.x);
   p.y += h * (1 - anchor.y);
   bb.t += h*(1-anchor.y);
   bb.b += h*(1-anchor.y);
-  gui.text(str, p, size, color, wrap, cursor);
-  
+
   return bb;
 };
 
@@ -528,12 +537,49 @@ render.image = function(tex, pos, scale = 1, rotation = 0, color = Color.white,
   var bind = render.sg_bind(render.spriteshader, shape.quad, {diffuse:tex});
   bind.inst = 1;
   render.spdraw(bind);
+  
+  var bb = {};
+  bb.b = pos.y;
+  bb.l = pos.x;
+  bb.t = pos.y + tex.height*scale;
+  bb.r = pos.x + tex.width*scale;
+  return bb;
+}
+
+render.slice9 = function(tex, pos, bb, scale = 1, color = Color.white)
+{
+  var t = os.make_transform();
+  t.pos = pos;
+  t.scale = [scale,scale,scale];
+  render.setpipeline(render.slice9.pipe);
+  render.setunim4(0, render.slice9.vs.unimap.model.slot, t);
+  render.shader_apply_material(render.slice9, {
+    shade: color
+  });
+  var bind = render.sg_bind(render.slice9, shape.quad, {diffuse:tex});
+  bind.inst = 1;
+  render.spdraw(bind);
+}
+
+var textssbo = render.text_ssbo();
+
+render.flush_text = function()
+{
+  if (!render.textshader) return;
+  render.setpipeline(render.textshader.pipe);
+  render.shader_apply_material(render.textshader);
+  var textbind = render.sg_bind(render.textshader, shape.quad, {text:render.font.texture}, textssbo);
+  textbind.inst = render.flushtext();
+  render.spdraw(textbind);
 }
 
 render.fontcache = {};
 render.set_font = function(path, size) {
   var fontstr = `${path}-${size}`;
+  if (render.font && render.fontcache[fontstr] === render.font) return;
   if (!render.fontcache[fontstr]) render.fontcache[fontstr] = os.make_font(path, size);
+  
+  render.flush_text();
 
   gui.font_set(render.fontcache[fontstr]);
   render.font = render.fontcache[fontstr];
diff --git a/shaders/9slice.cg b/shaders/9slice.cg
new file mode 100644
index 00000000..a2b4c657
--- /dev/null
+++ b/shaders/9slice.cg
@@ -0,0 +1,41 @@
+@block vert
+uniform vec4 rect;
+uniform vec2 diffuse_size;
+void vert()
+{
+  pos *= vec3(diffuse_size*rect.zw, 1);
+  uv = (uv*rect.zw)+rect.xy;
+}
+@end
+
+@block frag
+uniform vec4 border;
+// borders in pixels, x = left, y = bottom, z = right, w = top
+#define B vec4(10., 20., 30., 20.)
+
+vec2 uv9slice(vec2 uv, vec2 s, vec4 b)
+{
+  vec2 t = clamp((s * uv - b.xy) / (s - b.xy - b.zw), 0., 1.);
+  return mix(uv * s, 1. - s * (1. - uv), t);
+}
+
+void frag()
+{
+  vec2 uv = fragCoord/iResolution.xy;
+  vec2 ts = vec2(textureSize(iChannel0, 0));
+  // scaling factor
+  // probably available as uniform irl
+  vec2 s = iResolution.xy / ts;
+
+  // border by texture size, shouldn't be > .5
+  // probably available as uniform irl
+  vec4 b = min(B / ts.xyxy, vec4(.499));
+  uv = uv9slice(uv, s, b);
+  
+  vec3 col = vec3(texture(iChannel0, uv).x);
+
+  fragColor = vec4(col,1.0);
+}
+@end
+
+#include <base.cg>
\ No newline at end of file
diff --git a/shaders/basetext.cg b/shaders/basetext.cg
index 7835168f..fcad25d2 100644
--- a/shaders/basetext.cg
+++ b/shaders/basetext.cg
@@ -1,4 +1,5 @@
 #depth off
+#blend mix
 
 @vs vs
 in vec2 a_pos;
@@ -53,8 +54,8 @@ sampler smp;
 void main()
 {
   float lettera = texture(sampler2D(text,smp),fuv).r;
-  if (lettera < 0.1f) discard;
   frag();
+  color.a = lettera;
 }
 @end
 
diff --git a/shaders/sprite.cg b/shaders/sprite.cg
index 98e4203a..8633fd5d 100644
--- a/shaders/sprite.cg
+++ b/shaders/sprite.cg
@@ -1,5 +1,4 @@
 @block vert
-uniform vec4 emissive;
 uniform vec4 rect;
 uniform vec2 diffuse_size;
 void vert()
diff --git a/source/engine/font.c b/source/engine/font.c
index 9823a956..0c8344f2 100644
--- a/source/engine/font.c
+++ b/source/engine/font.c
@@ -80,7 +80,7 @@ struct sFont *MakeSDFFont(const char *fontfile, int height)
 }
 
 struct sFont *MakeFont(const char *fontfile, int height) {
-  int packsize = 1024;
+  int packsize = 2048;
 
   struct sFont *newfont = calloc(1, sizeof(struct sFont));
   newfont->height = height;
@@ -106,11 +106,16 @@ struct sFont *MakeFont(const char *fontfile, int height) {
   if (!stbtt_InitFont(&fontinfo, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer, 0))) {
     YughError("Failed to make font %s", fontfile);
   }
+  
+  int ascent, descent, linegap;
 
-  stbtt_GetFontVMetrics(&fontinfo, &newfont->ascent, &newfont->descent, &newfont->linegap);
-  //newfont->emscale = stbtt_ScaleForMappingEmToPixels(&fontinfo, 16);
-  newfont->emscale = stbtt_ScaleForPixelHeight(&fontinfo, height);
-  newfont->linegap = (newfont->ascent - newfont->descent) * newfont->emscale*1.5;
+  stbtt_GetFontVMetrics(&fontinfo, &ascent, &descent, &linegap);
+  float emscale = stbtt_ScaleForPixelHeight(&fontinfo, height);
+  newfont->ascent = ascent*emscale;
+  newfont->descent = descent*emscale;
+  newfont->linegap = linegap*emscale;
+  newfont->linegap = ((newfont->ascent - newfont->descent) - newfont->linegap);
+  printf("newfont : %g, %g, %g\n", newfont->ascent, newfont->descent, newfont->linegap);
 
   newfont->texture = malloc(sizeof(texture));
   newfont->texture->id = sg_make_image(&(sg_image_desc){
@@ -137,12 +142,9 @@ struct sFont *MakeFont(const char *fontfile, int height) {
     r.y = (glyph.y0) / (float)packsize;
     r.h = (glyph.y1-glyph.y0) / (float)packsize;
 
-    stbtt_GetCodepointHMetrics(&fontinfo, c, &newfont->Characters[c].Advance, &newfont->Characters[c].leftbearing);
-    newfont->Characters[c].leftbearing *= newfont->emscale;
-
     newfont->Characters[c].Advance = glyph.xadvance; /* x distance from this char to the next */
-    newfont->Characters[c].Size[0] = glyph.x1 - glyph.x0; 
-    newfont->Characters[c].Size[1] = glyph.y1 - glyph.y0;
+    newfont->Characters[c].Size[0] = (glyph.x1 - glyph.x0);
+    newfont->Characters[c].Size[1] = (glyph.y1 - glyph.y0);
     newfont->Characters[c].Bearing[0] = glyph.xoff;
     newfont->Characters[c].Bearing[1] = glyph.yoff2;
     newfont->Characters[c].rect = r;
@@ -202,8 +204,6 @@ void sdrawCharacter(struct Character c, HMM_Vec2 cursor, float scale, struct rgb
   
   struct text_vert vert;
 
-  float lsize = 1.0 / 1024.0;
-
   vert.pos.x = cursor.X + c.Bearing[0] * scale;
   vert.pos.y = cursor.Y - c.Bearing[1] * scale;
   vert.wh.x = c.Size[0] * scale;
@@ -290,7 +290,12 @@ struct boundingbox text_bb(const char *text, float scale, float lw, float tracki
     }
   }
 
-  return cwh2bb((HMM_Vec2){0,0}, (HMM_Vec2){cursor.X,use_font->linegap-cursor.Y});
+  return (struct boundingbox){
+    .b = cursor.Y + use_font->descent,
+    .t = cursor.Y + use_font->ascent,
+    .l = 0,
+    .r = cursor.X
+  };
 }
 
 void check_caret(int caret, int l, HMM_Vec2 pos, float scale, struct rgba color)
diff --git a/source/engine/font.h b/source/engine/font.h
index 692eba5b..db619885 100644
--- a/source/engine/font.h
+++ b/source/engine/font.h
@@ -22,10 +22,9 @@ struct Character {
 struct sFont {
   uint32_t fontTexture;
   uint32_t height; /* in pixels */
-  int ascent;
-  int descent;
-  int linegap;
-  float emscale;
+  float ascent;
+  float descent;
+  float linegap;
   struct Character Characters[256];
   sg_image texID;
   texture *texture;
diff --git a/source/engine/jsffi.c b/source/engine/jsffi.c
index b26cd67b..b871d662 100644
--- a/source/engine/jsffi.c
+++ b/source/engine/jsffi.c
@@ -617,7 +617,6 @@ int point2segindex(HMM_Vec2 p, HMM_Vec2 *segs, double slop) {
   return best;
 }
 
-
 JSC_GETSET(warp_gravity, strength, number)
 JSC_GETSET(warp_gravity, decay, number)
 JSC_GETSET(warp_gravity, spherical, boolean)