From e05aa45f672eb49312449d359a9e345223741b19 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Fri, 9 Apr 2021 22:37:49 -0400
Subject: graphics: Rewrite tile map module.

---
 Makefile.am                        |   2 +-
 chickadee/graphics/tile-map.scm    | 926 +++++++++++++++++++++++++++++++++++++
 chickadee/graphics/tiled.scm       | 500 --------------------
 doc/api.texi                       |  25 +-
 examples/images/serene-village.png | Bin 0 -> 122591 bytes
 examples/images/tiles.png          | Bin 100846 -> 0 bytes
 examples/maps/example.tmx          | 348 ++++++++++----
 examples/maps/serene-village.tsx   |  84 ++++
 examples/tile-map.scm              | 100 ++++
 examples/tiled.scm                 |  81 ----
 10 files changed, 1397 insertions(+), 669 deletions(-)
 create mode 100644 chickadee/graphics/tile-map.scm
 delete mode 100644 chickadee/graphics/tiled.scm
 create mode 100644 examples/images/serene-village.png
 delete mode 100644 examples/images/tiles.png
 create mode 100644 examples/maps/serene-village.tsx
 create mode 100644 examples/tile-map.scm
 delete mode 100644 examples/tiled.scm

diff --git a/Makefile.am b/Makefile.am
index d397f3a..a853edd 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -77,7 +77,7 @@ SOURCES = 					\
   chickadee/graphics/sprite.scm			\
   chickadee/graphics/9-patch.scm		\
   chickadee/graphics/font.scm			\
-  chickadee/graphics/tiled.scm			\
+  chickadee/graphics/tile-map.scm		\
   chickadee/graphics/particles.scm		\
   chickadee/graphics/phong.scm			\
   chickadee/graphics/pbr.scm			\
diff --git a/chickadee/graphics/tile-map.scm b/chickadee/graphics/tile-map.scm
new file mode 100644
index 0000000..8984691
--- /dev/null
+++ b/chickadee/graphics/tile-map.scm
@@ -0,0 +1,926 @@
+;;; Chickadee Game Toolkit
+;;; Copyright © 2018, 2020, 2021 David Thompson <dthompson2@worcester.edu>
+;;;
+;;; Chickadee is free software: you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published
+;;; by the Free Software Foundation, either version 3 of the License,
+;;; or (at your option) any later version.
+;;;
+;;; Chickadee is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Tile map renderer and Tiled map format loader.
+;;
+;;; Code:
+
+(define-module (chickadee graphics tile-map)
+  #:use-module (chickadee)
+  #:use-module (chickadee math matrix)
+  #:use-module (chickadee math rect)
+  #:use-module (chickadee math vector)
+  #:use-module (chickadee graphics blend)
+  #:use-module (chickadee graphics buffer)
+  #:use-module (chickadee graphics color)
+  #:use-module (chickadee graphics engine)
+  #:use-module (chickadee graphics shader)
+  #:use-module (chickadee graphics sprite)
+  #:use-module (chickadee graphics texture)
+  #:use-module (chickadee graphics viewport)
+  #:use-module (chickadee utils)
+  #:use-module (ice-9 match)
+  #:use-module ((rnrs base) #:select (mod))
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-43)
+  #:use-module (sxml simple)
+  #:use-module (sxml xpath)
+  #:export (animation-frame?
+            animation-frame-tile
+            animation-frame-duration
+
+            animation?
+            animation-frames
+            animation-duration
+
+            tile?
+            tile-id
+            tile-texture
+            tile-animation
+            tile-properties
+
+            make-tileset
+            tileset?
+            tileset-name
+            tileset-first-gid
+            tileset-size
+            tileset-tile-width
+            tileset-tile-height
+            tileset-rows
+            tileset-columns
+            tileset-properties
+
+            make-map-tile
+            map-tile?
+            map-tile-ref
+            map-tile-flipped-horizontally?
+            map-tile-flipped-vertically?
+            map-tile-flipped-diagonally?
+
+            make-tile-layer
+            tile-layer?
+            tile-layer-name
+            tile-layer-width
+            tile-layer-height
+            tile-layer-chunk-size
+            tile-layer-properties
+            tile-layer-ref
+            tile-layer-set!
+
+            object-layer?
+            object-layer-name
+            object-layer-objects
+            object-layer-properties
+
+            polygon?
+            polygon-points
+
+            map-object?
+            map-object-id
+            map-object-name
+            map-object-type
+            map-object-shape
+            map-object-properties
+
+            make-tile-map
+            tile-map?
+            tile-map-orientation
+            tile-map-width
+            tile-map-height
+            tile-map-tile-width
+            tile-map-tile-height
+            tile-map-tilesets
+            tile-map-layers
+            tile-map-properties
+            tile-map-rect
+            tile-map-layer-ref
+            point->tile
+            load-tile-map
+            draw-tile-map
+            draw-tile-map*))
+
+
+;;;
+;;; Tileset
+;;;
+
+(define-record-type <animation-frame>
+  (make-animation-frame texture duration)
+  animation-frame?
+  (texture animation-frame-texture)
+  (duration animation-frame-duration))
+
+(define-record-type <animation>
+  (%make-animation frames duration)
+  animation?
+  (frames animation-frames)
+  (duration animation-duration))
+
+(define (make-animation atlas first-gid frame-spec)
+  (let ((frames (map (match-lambda
+                       ((id duration)
+                        (let ((texture (texture-atlas-ref atlas
+                                                          (- id first-gid))))
+                          (make-animation-frame texture duration))))
+                     frame-spec)))
+    (%make-animation (list->vector frames)
+                     (fold (lambda (frame memo)
+                             (+ (animation-frame-duration frame) memo))
+                           0 frames))))
+
+(define (animation-frame-for-time animation time)
+  (let* ((time (mod time (animation-duration animation)))
+         (frames (animation-frames animation)))
+    (let loop ((i 0)
+               (t 0))
+      (let* ((frame (vector-ref frames i))
+             (d (animation-frame-duration frame)))
+        (if (< time (+ t d))
+            frame
+            (loop (+ i 1) (+ t d)))))))
+
+(define-record-type <tile>
+  (make-tile id texture animation properties)
+  tile?
+  (id tile-id)
+  (texture tile-texture)
+  (animation tile-animation)
+  (properties tile-properties))
+
+(define (animated-tile? tile)
+  (animation? (tile-animation tile)))
+
+(define (tile-frame-for-time tile time)
+  (let ((animation (tile-animation tile)))
+    (and animation (animation-frame-for-time animation time))))
+
+(define-record-type <tileset>
+  (%make-tileset name first-gid tile-width tile-height
+                 rows columns atlas tiles properties)
+  tileset?
+  (name tileset-name)
+  (first-gid tileset-first-gid)
+  (tile-width tileset-tile-width)
+  (tile-height tileset-tile-height)
+  (rows tileset-rows)
+  (columns tileset-columns)
+  (atlas tileset-atlas)
+  (tiles tileset-tiles)
+  (properties tileset-properties))
+
+(define* (make-tileset texture tile-width tile-height #:key
+                       (first-gid 1) (margin 0) (spacing 0)
+                       (name "anonymous") (properties '())
+                       (custom-tiles '()))
+  (call-with-values (lambda ()
+                      (texture-tileset-dimensions texture tile-width tile-height
+                                                  #:margin margin
+                                                  #:spacing spacing))
+    (lambda (columns rows)
+      (let* ((atlas (split-texture texture tile-width tile-height
+                                   #:margin margin
+                                   #:spacing spacing))
+             (tiles (make-vector (texture-atlas-size atlas))))
+        (for-range ((i (vector-length tiles)))
+          (let* ((id (+ first-gid i))
+                 (custom (or (assv-ref custom-tiles id) '()))
+                 (animation (assq-ref custom 'animation))
+                 (properties (assq-ref custom 'properties))
+                 (tile (make-tile id (texture-atlas-ref atlas i)
+                                  (and animation (make-animation atlas first-gid animation))
+                                  (or properties '()))))
+            (vector-set! tiles i tile)))
+        (%make-tileset name first-gid tile-width tile-height rows columns
+                       atlas tiles properties)))))
+
+(define (tileset-size tileset)
+  (texture-atlas-size (tileset-atlas tileset)))
+
+(define (tileset-ref tileset i)
+  (vector-ref (tileset-tiles tileset) (- i (tileset-first-gid tileset))))
+
+
+;;;
+;;; Object Layer
+;;;
+
+(define-record-type <object-layer>
+  (%make-object-layer name objects properties)
+  object-layer?
+  (name object-layer-name)
+  (objects object-layer-objects)
+  (properties object-layer-properties))
+
+(define-record-type <polygon>
+  (make-polygon points)
+  polygon?
+  (points polygon-points))
+
+(define-record-type <map-object>
+  (%make-map-object id name type shape properties)
+  map-object?
+  (id map-object-id)
+  (name map-object-name)
+  (type map-object-type)
+  (shape map-object-shape)
+  (properties map-object-properties))
+
+
+;;;
+;;; Chunk
+;;;
+
+(define-record-type <map-tile>
+  (%make-map-tile tile flipped-horizontally? flipped-vertically?
+                  flipped-diagonally?)
+  map-tile?
+  (tile map-tile-ref)
+  (flipped-horizontally? map-tile-flipped-horizontally?)
+  (flipped-vertically? map-tile-flipped-vertically?)
+  (flipped-diagonally? map-tile-flipped-diagonally?))
+
+(define* (make-map-tile tile #:key flipped-horizontally?
+                        flipped-vertically? flipped-diagonally?)
+  (%make-map-tile tile flipped-horizontally? flipped-vertically?
+                  flipped-diagonally?))
+
+(define-record-type <chunk>
+  (%make-chunk size tile-x tile-y tile-width tile-height anim-tiles
+               anim-frames tiles rebuild-geometry? geometry)
+  chunk?
+  (size chunk-size)
+  (tile-x chunk-tile-x)
+  (tile-y chunk-tile-y)
+  (tile-width chunk-tile-width)
+  (tile-height chunk-tile-height)
+  (anim-tiles chunk-anim-tiles)
+  (anim-frames chunk-anim-frames)
+  (tiles chunk-tiles)
+  (rebuild-geometry? chunk-rebuild-geometry? set-chunk-rebuild-geometry!)
+  (geometry chunk-geometry))
+
+(define %default-chunk-size 30)
+
+(define-geometry-type <chunk-vertex>
+  chunk-vertex-ref
+  chunk-vertex-set!
+  chunk-vertex-append!
+  (position vec2)
+  (texture vec2))
+
+(define (make-chunk size tile-x tile-y tile-width tile-height)
+  (let ((tiles (make-vector size)))
+    (for-range ((y size))
+      (let ((row (make-vector size)))
+        (for-range ((x size))
+          (vector-set! row x #f))
+        (vector-set! tiles y row)))
+    (%make-chunk size tile-x tile-y tile-width tile-height
+                 (make-hash-table) (make-hash-table) tiles #t
+                 (make-hash-table))))
+
+(define (chunk-anim-decrement chunk tile)
+  (let* ((t (chunk-anim-tiles chunk))
+         (n (hashq-ref t tile 0)))
+    (cond
+     ((= n 0)
+      #f)
+     ((= n 1)
+      (hashq-remove! t tile)
+      (hashq-remove! (chunk-anim-frames chunk) tile))
+     (else
+      (hashq-set! t tile (- n 1))))))
+
+(define (chunk-anim-increment chunk tile)
+  (let ((t (chunk-anim-tiles chunk)))
+    (hashq-set! t tile (+ (or (hashq-ref t tile) 0) 1))))
+
+(define (chunk-bounds-check chunk x y)
+  (let ((n (chunk-size chunk)))
+    (unless (and (>= x 0) (>= y 0) (< x n) (< y n))
+      (error "chunk index out of bounds" x y))))
+
+(define (chunk-ref chunk x y)
+  (chunk-bounds-check chunk x y)
+  (vector-ref (vector-ref (chunk-tiles chunk) y) x))
+
+(define (chunk-ensure-geometry chunk texture)
+  (let ((chunk-size (chunk-size chunk))
+        (geometry-table (chunk-geometry chunk)))
+    (unless (hashq-ref geometry-table texture)
+      (let ((g (make-geometry <chunk-vertex>
+                              (* chunk-size chunk-size 4)
+                              #:index-capacity
+                              (* chunk-size chunk-size 6))))
+        (hashq-set! geometry-table texture g)))))
+
+(define (chunk-set! chunk x y tile)
+  (let ((tiles (chunk-tiles chunk)))
+    (chunk-bounds-check chunk x y)
+    (let ((existing-tile (chunk-ref chunk x y)))
+      (when (and existing-tile (animated-tile? (map-tile-ref existing-tile)))
+        (chunk-anim-decrement chunk (map-tile-ref existing-tile))))
+    (vector-set! (vector-ref tiles y) x tile)
+    (when tile
+      (let* ((tile* (map-tile-ref tile))
+             (texture (texture-parent (tile-texture tile*))))
+        (when (animated-tile? tile*)
+          (chunk-anim-increment chunk tile*))
+        (chunk-ensure-geometry chunk texture)))
+    (set-chunk-rebuild-geometry! chunk #t)))
+
+(define (chunk-rebuild-geometry! chunk)
+  (let* ((anim-frames (chunk-anim-frames chunk))
+         (t (chunk-geometry chunk))
+         (n (chunk-size chunk))
+         (tw (exact->inexact (chunk-tile-width chunk)))
+         (th (exact->inexact (chunk-tile-height chunk)))
+         (x0 (* (chunk-tile-x chunk) tw))
+         (y0 (* (chunk-tile-y chunk) th)))
+    (hash-for-each (lambda (texture geometry)
+                     (geometry-begin! geometry))
+                   t)
+    (for-range ((x n) (y n))
+      (let ((tile (chunk-ref chunk x y)))
+        (when tile
+          (let* ((tile* (map-tile-ref tile))
+                 (texture (if (animated-tile? tile*)
+                              (animation-frame-texture
+                               (hashq-ref anim-frames tile*))
+                              (tile-texture tile*)))
+                 (geometry (hashq-ref t (texture-parent texture)))
+                 (vertex-offset (geometry-vertex-count geometry <chunk-vertex>))
+                 (x1 (+ x0 (* x tw)))
+                 (y1 (+ y0 (* y th)))
+                 (x2 (+ x1 tw))
+                 (y2 (+ y1 th))
+                 (texcoords (texture-gl-tex-rect texture))
+                 (s1 (rect-left texcoords))
+                 (t1 (rect-bottom texcoords))
+                 (s2 (rect-right texcoords))
+                 (t2 (rect-top texcoords))
+                 (flip-h? (map-tile-flipped-horizontally? tile))
+                 (flip-v? (map-tile-flipped-vertically? tile))
+                 (flip-d? (map-tile-flipped-diagonally? tile))
+                 (as (cond
+                      ((and flip-d? flip-h?) s2)
+                      ((and flip-d? flip-v?) s1)
+                      (flip-h? s2)
+                      (else s1)))
+                 (at (cond
+                      ((and flip-d? flip-h?) t1)
+                      ((and flip-d? flip-v?) t2)
+                      (flip-v? t2)
+                      (else t1)))
+                 (bs (cond
+                      ((and flip-d? flip-h?) s2)
+                      ((and flip-d? flip-v?) s1)
+                      (flip-h? s1)
+                      (else s2)))
+                 (bt (cond
+                      ((and flip-d? flip-h?) t2)
+                      ((and flip-d? flip-v?) t1)
+                      (flip-v? t2)
+                      (else t1)))
+                 (cs (cond
+                      ((and flip-d? flip-h?) s1)
+                      ((and flip-d? flip-v?) s2)
+                      (flip-h? s1)
+                      (else s2)))
+                 (ct (cond
+                      ((and flip-d? flip-h?) t2)
+                      ((and flip-d? flip-v?) t1)
+                      (flip-v? t1)
+                      (else t2)))
+                 (ds (cond
+                      ((and flip-d? flip-h?) s1)
+                      ((and flip-d? flip-v?) s2)
+                      (flip-h? s2)
+                      (else s1)))
+                 (dt (cond
+                      ((and flip-d? flip-h?) t1)
+                      ((and flip-d? flip-v?) t2)
+                      (flip-v? t1)
+                      (else t2))))
+            (chunk-vertex-append! geometry
+                                  (x1 y1 as at)
+                                  (x2 y1 bs bt)
+                                  (x2 y2 cs ct)
+                                  (x1 y2 ds dt))
+            (geometry-index-append! geometry
+                                    vertex-offset
+                                    (+ vertex-offset 3)
+                                    (+ vertex-offset 2)
+                                    vertex-offset
+                                    (+ vertex-offset 2)
+                                    (+ vertex-offset 1))))))
+    (hash-for-each (lambda (texture geometry)
+                     (geometry-end! geometry))
+                   t)))
+
+(define-graphics-variable tile-map-chunk-shader
+  (strings->shader
+   "
+#ifdef GLSL330
+layout (location = 0) in vec2 position;
+layout (location = 1) in vec2 tex;
+#elif defined(GLSL130)
+in vec2 position;
+in vec2 tex;
+#elif defined(GLSL120)
+attribute vec2 position;
+attribute vec2 tex;
+#endif
+#ifdef GLSL120
+varying vec2 fragTex;
+#else
+out vec2 fragTex;
+#endif
+uniform mat4 mvp;
+
+void main(void) {
+    fragTex = tex;
+    gl_Position = mvp * vec4(position.xy, 0.0, 1.0);
+}
+"
+   "
+#ifdef GLSL120
+varying vec2 fragTex;
+#else
+in vec2 fragTex;
+#endif
+#ifdef GLSL330
+out vec4 fragColor;
+#endif
+uniform sampler2D colorTexture;
+uniform vec4 tint;
+
+void main (void) {
+#ifdef GLSL330
+    fragColor = texture(colorTexture, fragTex) * tint;
+#else
+    gl_FragColor = texture2D(colorTexture, fragTex) * tint;
+#endif
+}
+"))
+
+(define (draw-chunk-geometry texture geometry matrix tint)
+  (with-graphics-state ((g:texture-0 texture))
+    (shader-apply* (graphics-variable-ref tile-map-chunk-shader)
+                   (geometry-vertex-array geometry)
+                   0
+                   (geometry-index-count geometry)
+                   #:tint tint
+                   #:mvp matrix)))
+
+(define (draw-chunk chunk matrix blend-mode tint time)
+  (let ((anim-tiles (chunk-anim-tiles chunk))
+        (anim-frames (chunk-anim-frames chunk)))
+    (hash-for-each (lambda (tile count)
+                     (let ((old-frame (hashq-ref anim-frames tile))
+                           (new-frame (tile-frame-for-time tile time)))
+                       (unless (eq? old-frame new-frame)
+                         (hashq-set! anim-frames tile new-frame)
+                         (set-chunk-rebuild-geometry! chunk #t))))
+                   anim-tiles))
+  (when (chunk-rebuild-geometry? chunk)
+    (chunk-rebuild-geometry! chunk)
+    (set-chunk-rebuild-geometry! chunk #f))
+  (with-graphics-state ((g:blend-mode blend-mode))
+    (hash-for-each (lambda (texture geometry)
+                     (draw-chunk-geometry texture geometry matrix tint))
+                   (chunk-geometry chunk))))
+
+
+;;;
+;;; Tile Layer
+;;;
+
+(define-record-type <tile-layer>
+  (%make-tile-layer name width height properties chunk-size chunks)
+  tile-layer?
+  (name tile-layer-name)
+  (width tile-layer-width)
+  (height tile-layer-height)
+  (properties tile-layer-properties)
+  (chunk-size tile-layer-chunk-size)
+  (chunks tile-layer-chunks))
+
+(define* (make-tile-layer width height tile-width tile-height #:key
+                          (name "anonymous")
+                          (properties '())
+                          (chunk-size %default-chunk-size))
+  (let* ((h (ceiling (/ height chunk-size)))
+         (chunks (make-vector h)))
+    (for-range ((y h))
+      (let* ((w (ceiling (/ width chunk-size)))
+             (row (make-vector w)))
+        (for-range ((x w))
+          (vector-set! row x (make-chunk chunk-size
+                                         (* x chunk-size)
+                                         (* y chunk-size)
+                                         tile-width tile-height)))
+        (vector-set! chunks y row)))
+    (%make-tile-layer name width height properties chunk-size chunks)))
+
+(define (tile-layer-bounds-check layer x y)
+  (unless (and (>= x 0) (>= y 0)
+               (< x (tile-layer-width layer))
+               (< y (tile-layer-height layer)))
+    (error "tile layer coordinates out of bounds" layer x y)))
+
+(define (call-with-chunk layer x y proc)
+  (tile-layer-bounds-check layer x y)
+  (let ((n (tile-layer-chunk-size layer)))
+    (proc (vector-ref (vector-ref (tile-layer-chunks layer)
+                                  (floor (/ y n)))
+                      (floor (/ x n)))
+          (modulo x n)
+          (modulo y n))))
+
+(define (tile-layer-ref! layer x y)
+  (call-with-chunk layer x y
+                   (lambda (chunk cx cy)
+                     (chunk-ref chunk cx cy))))
+
+(define (tile-layer-set! layer x y tile)
+  (call-with-chunk layer x y
+                   (lambda (chunk cx cy)
+                     (chunk-set! chunk cx cy tile))))
+
+(define (draw-tile-layer layer matrix x1 y1 x2 y2 blend-mode tint time)
+  (let ((width (tile-layer-width layer))
+        (height (tile-layer-height layer))
+        (chunk-size (tile-layer-chunk-size layer))
+        (chunks (tile-layer-chunks layer)))
+    ;; Render only the visible chunks.
+    (for-range ((x (ceiling (/ x2 chunk-size))
+                   (floor (/ x1 chunk-size)))
+                (y (ceiling (/ y2 chunk-size))
+                   (floor (/ y1 chunk-size))))
+      (draw-chunk (vector-ref (vector-ref chunks y) x)
+                  matrix blend-mode tint time))))
+
+
+;;;
+;;; Tile Map
+;;;
+
+(define-record-type <tile-map>
+  (%make-tile-map orientation width height tile-width tile-height
+                  tilesets layers properties)
+  tile-map?
+  (orientation tile-map-orientation)
+  (width tile-map-width)
+  (height tile-map-height)
+  (tile-width tile-map-tile-width)
+  (tile-height tile-map-tile-height)
+  (tilesets tile-map-tilesets)
+  (layers tile-map-layers)
+  (properties tile-map-properties))
+
+(define* (make-tile-map width height tile-width tile-height #:key
+                        (orientation 'orthogonal) (tilesets '())
+                        (layers '()) (properties '()))
+  "Make a tile map that is WIDTH x HEIGHT tiles in size and each tile
+is TILE-WIDTH x TILE-HEIGHT pixels in size.  TILESETS is a list of
+tilesets to be associated with the map.  LAYERS is a list of object
+and/or tile layers, sorted from bottom to top.  PROPERTIES is an alist
+of arbitrary custom data to associate with the map.  Currently, only
+the default ORIENTATION value of 'orthogonal' is supported."
+  (unless (eq? orientation 'orthogonal)
+    (error "unsupport tile map orientation" orientation))
+  (%make-tile-map orientation width height tile-width tile-height
+                  tilesets (list->vector layers) properties))
+
+(define (tile-map-layer-ref tile-map name)
+  "Return the map layer named NAME."
+  (define (layer-name layer)
+    (if (tile-layer? layer)
+        (tile-layer-name layer)
+        (object-layer-name layer)))
+  (let ((layers (tile-map-layers tile-map)))
+    (let loop ((i 0))
+      (cond
+       ((= i (vector-length layers))
+        #f)
+       ((string=? name (layer-name (vector-ref layers i)))
+        (vector-ref layers i))
+       (else
+        (loop (+ i 1)))))))
+
+(define (point->tile tile-map x y)
+  "Translate the pixel coordinates (X, Y) into tile coordinates."
+  (values (inexact->exact (floor (/ x (tile-map-tile-width tile-map))))
+          (inexact->exact (floor (/ y (tile-map-tile-height tile-map))))))
+
+(define* (load-tile-map file-name #:key (chunk-size %default-chunk-size))
+  "Load the Tiled TMX formatted map in FILE-NAME."
+  (define map-directory
+    (if (absolute-file-name? file-name)
+        (dirname file-name)
+        (string-append (getcwd) "/" (dirname file-name))))
+  (define (scope file-name)
+    (string-append map-directory "/" file-name))
+  (define* (attr node name #:optional (parse identity))
+    (let ((result ((sxpath `(@ ,name *text*)) node)))
+      (if (null? result)
+          #f
+          (parse (car result)))))
+  (define (parse-color-channel s start)
+    (/ (string->number (substring s start (+ start 2)) 16) 255.0))
+  (define (parse-property node)
+    (let ((name (attr node 'name string->symbol))
+          (type (or (attr node 'type string->symbol) 'string))
+          (value (attr node 'value)))
+      (cons name
+            (match type
+              ((or 'string 'file) value)
+              ('bool (not (string=? value "false")))
+              ((or 'int 'float) (string->number value))
+              ('color
+               (make-color (parse-color-channel value 3)
+                           (parse-color-channel value 5)
+                           (parse-color-channel value 7)
+                           (parse-color-channel value 1)))
+              (_ (error "unsupported property type" type))))))
+  (define (parse-image node)
+    (let ((source (attr node 'source))
+          (trans (attr node 'trans)))
+      (load-image (scope source)
+                  #:transparent-color (and trans (string->color trans)))))
+  (define (invert-tile-id id first-gid rows columns)
+    (let ((id* (- id first-gid)))
+      (+ (* (- rows (floor (/ id* columns)) 1)
+            columns)
+         (modulo id* columns)
+         first-gid)))
+  (define (parse-frame node first-gid rows columns)
+    (let ((tile-id (attr node 'tileid string->number))
+          (duration (attr node 'duration string->number)))
+      (list (+ first-gid (invert-tile-id tile-id 0 rows columns))
+            (/ duration 1000.0))))
+  (define (parse-tiles nodes first-gid rows columns)
+    (let ((frames (sxpath '(animation frame)))
+          (properties (sxpath '(properties property))))
+      (fold (lambda (node memo)
+              (let ((id (+ first-gid
+                           (invert-tile-id (attr node 'id string->number)
+                                           0 rows columns))))
+                (cons `(,id . ((animation . ,(map (lambda (f)
+                                                    (parse-frame f first-gid
+                                                                 rows columns))
+                                                  (frames node)))
+                               (properties . ,(map parse-property
+                                                   (properties node)))))
+                      memo)))
+            '()
+            nodes)))
+  (define (first-gid node)
+    (attr node 'firstgid string->number))
+  (define (parse-tileset node first-gid)
+    (let* ((name (attr node 'name))
+           (tile-width (attr node 'tilewidth string->number))
+           (tile-height (attr node 'tileheight string->number))
+           (margin (or (attr node 'margin string->number) 0))
+           (spacing (or (attr node 'spacing string->number) 0))
+           (texture (parse-image ((sxpath '(image)) node)))
+           (tiles (call-with-values
+                      (lambda ()
+                        (texture-tileset-dimensions texture
+                                                    tile-width
+                                                    tile-height
+                                                    #:margin margin
+                                                    #:spacing spacing))
+                    (lambda (columns rows)
+                      (parse-tiles ((sxpath '(tile)) node) first-gid rows columns))))
+           (properties (map parse-property
+                            ((sxpath '(properties property)) node))))
+      (make-tileset texture tile-width tile-height
+                    #:margin margin
+                    #:spacing spacing
+                    #:name name
+                    #:first-gid first-gid
+                    #:properties properties
+                    #:custom-tiles tiles)))
+  (define (parse-external-tileset node)
+    (let* ((first-gid (attr node 'firstgid string->number))
+           (source (scope (attr node 'source)))
+           (tree (call-with-input-file source xml->sxml)))
+      (parse-tileset (car ((sxpath '(tileset)) tree)) first-gid)))
+  (define (parse-tileset* node)
+    (if (attr node 'source)
+        (parse-external-tileset node)
+        (parse-tileset node (first-gid node))))
+  (define (tile-gid->map-tile raw-gid tilesets x y tile-width tile-height)
+    ;; The top 3 bits of the tile gid are flags for various types of
+    ;; flipping.
+    (let* ((flipped-horizontally? (> (logand raw-gid #x80000000) 0))
+           (flipped-vertically? (> (logand raw-gid #x40000000) 0))
+           (flipped-diagonally? (> (logand raw-gid #x20000000) 0))
+           ;; Remove the upper 3 bits to get the true tile id.
+           (gid (logand raw-gid #x1FFFFFFF))
+           (tileset (find (lambda (t)
+                            (and (>= gid (tileset-first-gid t))
+                                 (< gid (+ (tileset-first-gid t)
+                                           (tileset-size t)))))
+                          tilesets))
+           (tw (tileset-tile-width tileset))
+           (th (tileset-tile-height tileset))
+           (first-gid (tileset-first-gid tileset))
+           (rows (tileset-rows tileset))
+           (columns (tileset-columns tileset))
+           (id (invert-tile-id gid first-gid rows columns)))
+      (make-map-tile (tileset-ref tileset id)
+                     #:flipped-horizontally? flipped-horizontally?
+                     #:flipped-vertically? flipped-vertically?
+                     #:flipped-diagonally? flipped-diagonally?)))
+  (define (tile-gids->map-tiles gids width height tilesets)
+    (let ((tiles (make-vector (* width height))))
+      (let y-loop ((y 0)
+                   (rows (reverse gids))) ; invert y
+        (when (< y height)
+          (match rows
+            ((row . rest)
+             (let x-loop ((x 0)
+                          (columns row))
+               (when (< x width)
+                 (match columns
+                   ((gid . rest)
+                    (vector-set! tiles
+                                 (+ (* width y) x)
+                                 (if (zero? gid)
+                                     #f
+                                     (tile-gid->map-tile gid tilesets
+                                                         x y width height)))
+                    (x-loop (+ x 1) rest)))))
+             (y-loop (+ y 1) rest)))))
+      tiles))
+  (define (parse-csv lines width height tilesets)
+    (let ((gids (map (lambda (line)
+                       (filter-map (lambda (s)
+                                     (and (not (string-null? s))
+                                          (string->number s)))
+                                   (string-split line #\,)))
+                     (take (drop (string-split lines #\newline) 1) height))))
+      (tile-gids->map-tiles gids width height tilesets)))
+  (define (parse-layer-data node width height tilesets)
+    (let ((encoding (attr node 'encoding string->symbol))
+          (data (car ((sxpath '(*text*)) node))))
+      (match encoding
+        ('csv (parse-csv data width height tilesets))
+        (_ (error "unsupported tile layer encoding" encoding)))))
+  (define (parse-tile-layer node tile-width tile-height tilesets)
+    (let* ((name (attr node 'name))
+           (width (attr node 'width string->number))
+           (height (attr node 'height string->number))
+           (tiles (parse-layer-data ((sxpath '(data)) node)
+                                    width height tilesets))
+           (properties (map parse-property
+                            ((sxpath '(properties property)) node)))
+           (layer (make-tile-layer width height tile-width tile-height
+                                   #:name name
+                                   #:properties properties
+                                   #:chunk-size chunk-size)))
+      (for-range ((x width)
+                  (y height))
+        (tile-layer-set! layer x y (vector-ref tiles (+ (* y width) x))))
+      layer))
+  (define (parse-polygon node pixel-height)
+    (make-polygon
+     (list->vector
+      (map (lambda (s)
+             (match (string-split s #\,)
+               ((x y)
+                (vec2 (string->number x)
+                      (- pixel-height (string->number y))))))
+           (string-split (attr node 'points) #\space)))))
+  (define (parse-object node pixel-height)
+    (let* ((id (attr node 'id string->number))
+           (name (attr node 'name))
+           (type (attr node 'type string->symbol))
+           (x (attr node 'x string->number))
+           (y (- pixel-height (attr node 'y string->number)))
+           (width (attr node 'width string->number))
+           (height (attr node 'height string->number))
+           (shape (if (and width height)
+                      (make-rect x y width height)
+                      (parse-polygon (car ((sxpath '(polygon)) node))
+                                     pixel-height)))
+           (properties (map parse-property
+                            ((sxpath '(properties property)) node))))
+      (%make-map-object id name type shape properties)))
+  (define (parse-object-layer node pixel-height)
+    (let ((name (attr node 'name))
+          (objects (map (lambda (node)
+                          (parse-object node pixel-height))
+                        ((sxpath '(object)) node)))
+          (properties (map parse-property
+                           ((sxpath '(properties property)) node))))
+      (%make-object-layer name objects properties)))
+  (let* ((tree (call-with-input-file file-name xml->sxml))
+         (m ((sxpath '(map)) tree))
+         (version (attr m 'version))
+         (orientation (attr m 'orientation string->symbol))
+         (width (attr m 'width string->number))
+         (height (attr m 'height string->number))
+         (tile-width (attr m 'tilewidth string->number))
+         (tile-height (attr m 'tileheight string->number))
+         (properties ((sxpath '(map properties property)) tree))
+         (tilesets (map parse-tileset* ((sxpath '(map tileset)) tree)))
+         (layers ((node-or (sxpath '(map layer))
+                           (sxpath '(map objectgroup)))
+                  tree)))
+    (make-tile-map width height tile-width tile-height
+                   #:orientation orientation
+                   #:tilesets tilesets
+                   #:layers (map (lambda (node)
+                                   (match node
+                                     (('layer . _)
+                                      (parse-tile-layer node tile-width tile-height tilesets))
+                                     (('objectgroup . _)
+                                      (parse-object-layer node (* height tile-height)))))
+                                 layers)
+                    #:properties (map parse-property properties))))
+
+(define* (draw-tile-map* tile-map matrix region #:key
+                         layers (time (elapsed-time))
+                         (blend-mode blend:alpha) (tint white))
+  ;; Calculate the tiles that are visible so we don't waste time
+  ;; drawing unnecessary sprites.
+  (let* ((w (tile-map-width tile-map))
+         (h (tile-map-height tile-map))
+         (tw (tile-map-tile-width tile-map))
+         (th (tile-map-tile-height tile-map))
+         (rx (rect-x region))
+         (ry (rect-y region))
+         (rw (rect-width region))
+         (rh (rect-height region))
+         (x1 (max (inexact->exact (floor (/ rx tw))) 0))
+         (y1 (max (inexact->exact (floor (/ ry th))) 0))
+         (x2 (min (inexact->exact (ceiling (/ (+ rx rw) tw))) w))
+         (y2 (min (inexact->exact (ceiling (/ (+ ry rh) th))) h)))
+    (vector-for-each (lambda (i layer)
+                       (when (and (tile-layer? layer)
+                                  (or (not layers)
+                                      (memv i layers)))
+                         (draw-tile-layer layer matrix x1 y1 x2 y2 blend-mode tint time)))
+                     (tile-map-layers tile-map))))
+
+(define %null-vec2 (vec2 0.0 0.0))
+(define %default-scale (vec2 1.0 1.0))
+(define *matrix* (make-null-matrix4))
+(define *position* (vec2 0.0 0.0))
+(define *region* (make-rect 0.0 0.0 0.0 0.0))
+
+(define* (draw-tile-map tile-map
+                        #:key
+                        layers
+                        (camera %null-vec2)
+                        (position %null-vec2)
+                        (origin %null-vec2)
+                        (scale %default-scale)
+                        (rotation 0.0)
+                        (blend-mode blend:alpha)
+                        (tint white)
+                        (time (elapsed-time)))
+  "Draw TILE-MAP.  By default, all layers are drawn.  The LAYERS
+argument may be used to specify a list of layers to draw, instead."
+  ;; Make the region as big as the current viewport.
+  (let ((vp (current-viewport)))
+    (set-rect-x! *region* (vec2-x camera))
+    (set-rect-y! *region* (vec2-y camera))
+    (set-rect-width! *region* (viewport-width vp))
+    (set-rect-height! *region* (viewport-height vp)))
+  ;; Translation must be adjusted by inverse of camera.
+  (vec2-copy! camera *position*)
+  (vec2-mult! *position* -1.0)
+  (vec2-add! *position* position)
+  (matrix4-2d-transform! *matrix*
+                         #:origin origin
+                         #:position *position*
+                         #:rotation rotation
+                         #:scale scale)
+  (matrix4-mult! *matrix* *matrix* (current-projection))
+  (draw-tile-map* tile-map *matrix* *region*
+                  #:layers layers
+                  #:blend-mode blend-mode
+                  #:tint tint
+                  #:time time))
diff --git a/chickadee/graphics/tiled.scm b/chickadee/graphics/tiled.scm
deleted file mode 100644
index 2692418..0000000
--- a/chickadee/graphics/tiled.scm
+++ /dev/null
@@ -1,500 +0,0 @@
-;;; Chickadee Game Toolkit
-;;; Copyright © 2018, 2020, 2021 David Thompson <davet@gnu.org>
-;;;
-;;; Chickadee is free software: you can redistribute it and/or modify
-;;; it under the terms of the GNU General Public License as published
-;;; by the Free Software Foundation, either version 3 of the License,
-;;; or (at your option) any later version.
-;;;
-;;; Chickadee is distributed in the hope that it will be useful, but
-;;; WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-;;; General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU General Public License
-;;; along with this program.  If not, see
-;;; <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-;;
-;; Tiled map format parser and renderer.
-;;
-;;; Code:
-
-(define-module (chickadee graphics tiled)
-  #:use-module (chickadee math matrix)
-  #:use-module (chickadee math rect)
-  #:use-module (chickadee math vector)
-  #:use-module (chickadee graphics color)
-  #:use-module (chickadee graphics sprite)
-  #:use-module (chickadee graphics texture)
-  #:use-module (chickadee graphics viewport)
-  #:use-module (chickadee utils)
-  #:use-module (ice-9 match)
-  #:use-module (srfi srfi-1)
-  #:use-module (srfi srfi-9)
-  #:use-module (srfi srfi-43)
-  #:use-module (sxml simple)
-  #:use-module (sxml xpath)
-  #:export (tile-map?
-            tile-map-orientation
-            tile-map-width
-            tile-map-height
-            tile-map-tile-width
-            tile-map-tile-height
-            tile-map-tilesets
-            tile-map-layers
-            tile-map-properties
-            tile-map-rect
-            tile-map-layer-ref
-            point->tile
-
-            animation-frame?
-            animation-frame-tile
-            animation-frame-duration
-
-            tile?
-            tile-id
-            tile-animation
-            tile-properties
-
-            tileset?
-            tileset-name
-            tileset-first-gid
-            tileset-size
-            tileset-tile-width
-            tileset-tile-height
-            tileset-atlas
-            tileset-tiles
-            tileset-properties
-
-            map-tile?
-            map-tile-ref
-            map-tile-rect
-
-            tile-layer?
-            tile-layer-name
-            tile-layer-width
-            tile-layer-height
-            tile-layer-tiles
-            tile-layer-properties
-
-            object-layer?
-            object-layer-name
-            object-layer-objects
-            object-layer-properties
-
-            polygon?
-            polygon-points
-
-            map-object?
-            map-object-id
-            map-object-name
-            map-object-type
-            map-object-shape
-            map-object-properties
-
-            load-tile-map
-            draw-tile-map
-            draw-tile-map*))
-
-(define-record-type <tile-map>
-  (%make-tile-map orientation width height tile-width tile-height
-                  tilesets layers properties rect)
-  tile-map?
-  (orientation tile-map-orientation)
-  (width tile-map-width)
-  (height tile-map-height)
-  (tile-width tile-map-tile-width)
-  (tile-height tile-map-tile-height)
-  (tilesets tile-map-tilesets)
-  (layers tile-map-layers)
-  (properties tile-map-properties)
-  (rect tile-map-rect))
-
-(define-record-type <animation-frame>
-  (%make-animation-frame tile duration)
-  animation-frame?
-  (tile animation-frame-tile)
-  (duration animation-frame-duration))
-
-(define-record-type <tile>
-  (%make-tile id texture batch animation properties)
-  tile?
-  (id tile-id)
-  (texture tile-texture)
-  (batch tile-batch)
-  (animation tile-animation)
-  (properties tile-properties))
-
-(define-record-type <tileset>
-  (%make-tileset name first-gid size tile-width tile-height
-                 atlas tiles properties batch)
-  tileset?
-  (name tileset-name)
-  (first-gid tileset-first-gid)
-  (size tileset-size)
-  (tile-width tileset-tile-width)
-  (tile-height tileset-tile-height)
-  (atlas tileset-atlas)
-  (tiles tileset-tiles)
-  (properties tileset-properties)
-  (batch tileset-batch))
-
-(define-record-type <map-tile>
-  (%make-map-tile tile rect)
-  map-tile?
-  (tile map-tile-ref)
-  (rect map-tile-rect))
-
-(define-record-type <tile-layer>
-  (%make-tile-layer name width height tiles properties)
-  tile-layer?
-  (name tile-layer-name)
-  (width tile-layer-width)
-  (height tile-layer-height)
-  (tiles tile-layer-tiles)
-  (properties tile-layer-properties))
-
-(define-record-type <object-layer>
-  (%make-object-layer name objects properties)
-  object-layer?
-  (name object-layer-name)
-  (objects object-layer-objects)
-  (properties object-layer-properties))
-
-;; TODO: This should probably be a generic thing that we can use
-;; outside of tiled maps.
-(define-record-type <polygon>
-  (make-polygon points)
-  polygon?
-  (points polygon-points))
-
-(define-record-type <map-object>
-  (%make-map-object id name type shape properties)
-  map-object?
-  (id map-object-id)
-  (name map-object-name)
-  (type map-object-type)
-  (shape map-object-shape)
-  (properties map-object-properties))
-
-(define (tile-map-layer-ref tile-map name)
-  "Return the layer named NAME."
-  (define (layer-name layer)
-    (if (tile-layer? layer)
-        (tile-layer-name layer)
-        (object-layer-name layer)))
-  (let ((layers (tile-map-layers tile-map)))
-    (let loop ((i 0))
-      (cond
-       ((= i (vector-length layers))
-        #f)
-       ((string=? name (layer-name (vector-ref layers i)))
-        (vector-ref layers i))
-       (else
-        (loop (+ i 1)))))))
-
-(define (point->tile tile-map x y)
-  "Translate the pixel coordinates (X, Y) into tile coordinates."
-  (values (inexact->exact (floor (/ x (tile-map-tile-width tile-map))))
-          (inexact->exact (floor (/ y (tile-map-tile-height tile-map))))))
-
-(define (load-tile-map file-name)
-  "Load the Tiled TMX formatted map in FILE-NAME."
-  (define map-directory
-    (if (absolute-file-name? file-name)
-        (dirname file-name)
-        (string-append (getcwd) "/" (dirname file-name))))
-  (define (scope file-name)
-    (string-append map-directory "/" file-name))
-  (define* (attr node name #:optional (parse identity))
-    (let ((result ((sxpath `(@ ,name *text*)) node)))
-      (if (null? result)
-          #f
-          (parse (car result)))))
-  (define (parse-color-channel s start)
-    (/ (string->number (substring s start (+ start 2)) 16) 255.0))
-  (define (parse-property node)
-    (let ((name (attr node 'name string->symbol))
-          (type (or (attr node 'type string->symbol) 'string))
-          (value (attr node 'value)))
-      (cons name
-            (match type
-              ((or 'string 'file) value)
-              ('bool (not (string=? value "false")))
-              ((or 'int 'float) (string->number value))
-              ('color
-               (make-color (parse-color-channel value 3)
-                           (parse-color-channel value 5)
-                           (parse-color-channel value 7)
-                           (parse-color-channel value 1)))
-              (_ (error "unsupported property type" type))))))
-  (define (parse-image node)
-    (let ((source (attr node 'source))
-          (trans (attr node 'trans)))
-      (load-image (scope source)
-                  #:transparent-color (and trans (string->color trans)))))
-  (define (parse-frame node)
-    (let ((tile-id (attr node 'tileid string->number))
-          (duration (attr node 'duration string->number)))
-      ;; TODO: lookup actual tile in tileset
-      (%make-animation-frame tile-id duration)))
-  (define (atlas-ref atlas id rows columns)
-    ;; Tiled enumerates tiles from the top-left of the tileset image,
-    ;; but here in OpenGL land the origin is in the bottom-left, so we
-    ;; have to do some math invert the rows.
-    (texture-atlas-ref atlas
-                       (+ (* (- rows (floor (/ id columns)) 1)
-                             columns)
-                          (modulo id columns))))
-  (define (parse-tile node rows columns atlas batch)
-    (let ((id (attr node 'id string->number))
-          (animation (map parse-frame ((sxpath '(animation frame)) node)))
-          (properties (map parse-property
-                           ((sxpath '(properties property)) node))))
-      (%make-tile id (atlas-ref atlas id rows columns)
-                  batch animation properties)))
-  (define (parse-tiles nodes size columns atlas batch)
-    (let ((table (make-hash-table))
-          (tiles (make-vector size))
-          (rows (/ size columns)))
-      (for-each (lambda (node)
-                  (let ((tile (parse-tile node rows columns atlas batch)))
-                    (hash-set! table (tile-id tile) tile)))
-                nodes)
-      (for-range ((i size))
-        (let ((tile
-               (or (hash-ref table i)
-                   (%make-tile i (atlas-ref atlas i rows columns)
-                               batch #f '()))))
-          (vector-set! tiles i tile)))
-      tiles))
-  (define (first-gid node)
-    (attr node 'firstgid string->number))
-  (define (parse-internal-tileset node first-gid)
-    (let* ((name (attr node 'name))
-           (tile-width (attr node 'tilewidth string->number))
-           (tile-height (attr node 'tileheight string->number))
-           (margin (or (attr node 'margin string->number) 0))
-           (spacing (or (attr node 'spacing string->number) 0))
-           (columns (attr node 'columns string->number))
-           (size (attr node 'tilecount string->number))
-           (texture (parse-image ((sxpath '(image)) node)))
-           (atlas (split-texture texture tile-width tile-height
-                                 #:margin margin #:spacing spacing))
-           (batch (make-sprite-batch texture))
-           (tiles (parse-tiles ((sxpath '(tile)) node) size columns atlas batch))
-           (properties (map parse-property
-                            ((sxpath '(properties property)) node))))
-      (%make-tileset name first-gid size tile-width tile-height
-                     atlas tiles properties batch)))
-  (define (parse-external-tileset node)
-    (let* ((first-gid (attr node 'firstgid string->number))
-           (source (scope (attr node 'source)))
-           (tree (call-with-input-file source xml->sxml)))
-      (parse-internal-tileset (car ((sxpath '(tileset)) tree)) first-gid)))
-  (define (parse-tileset node)
-    (if (attr node 'source)
-        (parse-external-tileset node)
-        (parse-internal-tileset node (first-gid node))))
-  (define (tile-gid->map-tile raw-gid tilesets x y tile-width tile-height)
-    ;; The top 3 bits of the tile gid are flags for various types of
-    ;; flipping.
-    ;;
-    ;; TODO: Respect the flipping settings.
-    (let* ((flipped-horizontally? (> (logand raw-gid #x80000000) 0))
-           (flipped-vertically? (> (logand raw-gid #x40000000) 0))
-           (flipped-diagonally? (> (logand raw-gid #x20000000) 0))
-           ;; Remove the upper 3 bits to get the true tile id.
-           (gid (logand raw-gid #x1FFFFFFF))
-           (tileset (find (lambda (t)
-                            (and (>= gid (tileset-first-gid t))
-                                 (< gid (+ (tileset-first-gid t)
-                                           (tileset-size t)))))
-                          tilesets))
-           (tw (tileset-tile-width tileset))
-           (th (tileset-tile-height tileset)))
-      (%make-map-tile (vector-ref (tileset-tiles tileset)
-                                  (- gid (tileset-first-gid tileset)))
-                      (make-rect (* x tw) (* y th) tw th))))
-  (define (tile-gids->map-tiles gids width height tilesets)
-    (let ((tiles (make-vector (* width height))))
-      (let y-loop ((y 0)
-                   (rows (reverse gids))) ; invert y
-        (when (< y height)
-          (match rows
-            ((row . rest)
-             (let x-loop ((x 0)
-                          (columns row))
-               (when (< x width)
-                 (match columns
-                   ((gid . rest)
-                    (vector-set! tiles
-                                 (+ (* width y) x)
-                                 (if (zero? gid)
-                                     #f
-                                     (tile-gid->map-tile gid tilesets
-                                                         x y width height)))
-                    (x-loop (+ x 1) rest)))))
-             (y-loop (+ y 1) rest)))))
-      tiles))
-  (define (parse-csv lines width height tilesets)
-    (let ((gids (map (lambda (line)
-                       (filter-map (lambda (s)
-                                     (and (not (string-null? s))
-                                          (string->number s)))
-                                   (string-split line #\,)))
-                     (take (drop (string-split lines #\newline) 1) height))))
-      (tile-gids->map-tiles gids width height tilesets)))
-  (define (parse-layer-data node width height tilesets)
-    (let ((encoding (attr node 'encoding string->symbol))
-          (data (car ((sxpath '(*text*)) node))))
-      (match encoding
-        ('csv (parse-csv data width height tilesets))
-        (_ (error "unsupported tile layer encoding" encoding)))))
-  (define (parse-tile-layer node tilesets)
-    (let* ((name (attr node 'name))
-           (width (attr node 'width string->number))
-           (height (attr node 'height string->number))
-           (tiles (parse-layer-data ((sxpath '(data)) node)
-                                    width height tilesets))
-           (properties (map parse-property
-                            ((sxpath '(properties property)) node))))
-      (%make-tile-layer name width height tiles properties)))
-  (define (parse-polygon node pixel-height)
-    (make-polygon
-     (list->vector
-      (map (lambda (s)
-             (match (string-split s #\,)
-               ((x y)
-                (vec2 (string->number x)
-                      (- pixel-height (string->number y))))))
-           (string-split (attr node 'points) #\space)))))
-  (define (parse-object node pixel-height)
-    (let* ((id (attr node 'id string->number))
-           (name (attr node 'name))
-           (type (attr node 'type string->symbol))
-           (x (attr node 'x string->number))
-           (y (- pixel-height (attr node 'y string->number)))
-           (width (attr node 'width string->number))
-           (height (attr node 'height string->number))
-           (shape (if (and width height)
-                      (make-rect x y width height)
-                      (parse-polygon (car ((sxpath '(polygon)) node))
-                                     pixel-height)))
-           (properties (map parse-property
-                            ((sxpath '(properties property)) node))))
-      (%make-map-object id name type shape properties)))
-  (define (parse-object-layer node pixel-height)
-    (let ((name (attr node 'name))
-          (objects (map (lambda (node)
-                          (parse-object node pixel-height))
-                        ((sxpath '(object)) node)))
-          (properties (map parse-property
-                           ((sxpath '(properties property)) node))))
-      (%make-object-layer name objects properties)))
-  (let* ((tree (call-with-input-file file-name xml->sxml))
-         (m ((sxpath '(map)) tree))
-         (version (attr m 'version))
-         (orientation (attr m 'orientation string->symbol))
-         (width (attr m 'width string->number))
-         (height (attr m 'height string->number))
-         (tile-width (attr m 'tilewidth string->number))
-         (tile-height (attr m 'tileheight string->number))
-         (properties ((sxpath '(map properties property)) tree))
-         (tilesets (map parse-tileset ((sxpath '(map tileset)) tree)))
-         (layers ((node-or (sxpath '(map layer))
-                           (sxpath '(map objectgroup)))
-                  tree)))
-    (%make-tile-map orientation width height tile-width tile-height
-                    tilesets
-                    (list->vector
-                     (map (lambda (node)
-                            (match node
-                              (('layer . _)
-                               (parse-tile-layer node tilesets))
-                              (('objectgroup . _)
-                               (parse-object-layer node (* height tile-height)))))
-                          layers))
-                    (map parse-property properties)
-                    (make-rect 0.0
-                               0.0
-                               (* width tile-width)
-                               (* height tile-height)))))
-
-
-(define (draw-tile-layer layer matrix x1 y1 x2 y2)
-  (let ((width (tile-layer-width layer))
-        (height (tile-layer-height layer)))
-    (for-range ((x x2 x1)
-                (y y2 y1))
-      (let ((tile (vector-ref (tile-layer-tiles layer)
-                              (+ (* y width) x))))
-        (when tile
-          (let ((tref (map-tile-ref tile)))
-            (sprite-batch-add* (tile-batch tref)
-                               (map-tile-rect tile)
-                               matrix
-                               #:texture-region (tile-texture tref))))))))
-
-(define* (draw-tile-map* tile-map matrix region #:key layers)
-  ;; Calculate the tiles that are visible so we don't waste time
-  ;; drawing unnecessary sprites.
-  (let* ((w (tile-map-width tile-map))
-         (h (tile-map-height tile-map))
-         (tw (tile-map-tile-width tile-map))
-         (th (tile-map-tile-height tile-map))
-         (rx (rect-x region))
-         (ry (rect-y region))
-         (rw (rect-width region))
-         (rh (rect-height region))
-         (x1 (max (inexact->exact (floor (/ rx tw))) 0))
-         (y1 (max (inexact->exact (floor (/ ry th))) 0))
-         (x2 (min (inexact->exact (ceiling (/ (+ rx rw) tw))) w))
-         (y2 (min (inexact->exact (ceiling (/ (+ ry rh) th))) h)))
-    (vector-for-each (lambda (i layer)
-                       (when (and (tile-layer? layer)
-                                  (or (not layers)
-                                      (memv i layers)))
-                             (for-each (lambda (tileset)
-                                         (sprite-batch-clear! (tileset-batch tileset)))
-                                       (tile-map-tilesets tile-map))
-                             (draw-tile-layer layer matrix x1 y1 x2 y2)
-                             (for-each (lambda (tileset)
-                                         (draw-sprite-batch (tileset-batch tileset)))
-                                       (tile-map-tilesets tile-map))))
-                     (tile-map-layers tile-map))))
-
-(define %null-vec2 (vec2 0.0 0.0))
-(define %default-scale (vec2 1.0 1.0))
-(define *matrix* (make-null-matrix4))
-(define *position* (vec2 0.0 0.0))
-(define *region* (make-rect 0.0 0.0 0.0 0.0))
-
-(define* (draw-tile-map tile-map
-                        #:key
-                        layers
-                        (camera %null-vec2)
-                        (position %null-vec2)
-                        (origin %null-vec2)
-                        (scale %default-scale)
-                        (rotation 0.0))
-  "Draw TILE-MAP.  By default, all layers are drawn.  The LAYERS
-argument may be used to specify a list of layers to draw, instead."
-  ;; Make the region as big as the current viewport.
-  (let ((vp (current-viewport)))
-    (set-rect-x! *region* (vec2-x camera))
-    (set-rect-y! *region* (vec2-y camera))
-    (set-rect-width! *region* (viewport-width vp))
-    (set-rect-height! *region* (viewport-height vp)))
-  ;; Translation must be adjusted by inverse of camera.
-  (vec2-copy! camera *position*)
-  (vec2-mult! *position* -1.0)
-  (vec2-add! *position* position)
-  (matrix4-2d-transform! *matrix*
-                         #:origin origin
-                         #:position *position*
-                         #:rotation rotation
-                         #:scale scale)
-  (draw-tile-map* tile-map *matrix* *region* #:layers layers))
diff --git a/doc/api.texi b/doc/api.texi
index e99c89c..28a5553 100644
--- a/doc/api.texi
+++ b/doc/api.texi
@@ -2532,7 +2532,7 @@ A tile map is a scene created by composing lots of small sprites,
 called ``tiles'', into a larger image.  One program for editing such
 maps is called @url{http://mapeditor.org,Tiled}.  Chickadee has native
 support for loading and rendering Tiled maps in the @code{(chickadee
-graphics tiled)} module.
+graphics tile-map)} module.
 
 @deffn {Procedure} load-tile-map file-name
 Load the Tiled formatted map in @var{file-name} and return a new tile
@@ -2581,7 +2581,8 @@ coordinates.
 @end deffn
 
 @deffn {Procedure} draw-tile-map tile-map [#:layers] [#:camera] @
-       [#:origin] [#:position] [#:scale] [#:rotation]
+       [#:origin] [#:position] [#:scale] [#:rotation] [#:blend-mode] @
+       [#:tint] [#:time] [#:chunk-size]
 
 Draw the layers of @var{tile-map} as viewed from @var{camera}, a 2D
 vector offset.  By default, all layers are drawn.  To draw a subset of
@@ -2621,6 +2622,14 @@ Return the texture atlas for @var{tileset}.
 Return the tiles in @var{tileset}.
 @end deffn
 
+@deffn {Procedure} tileset-rows tileset
+Return the number of rows in @var{tileset}.
+@end deffn
+
+@deffn {Procedure} tileset-columns tileset
+Return the number of columns in @var{tileset}.
+@end deffn
+
 @deffn {Procedure} tileset-properties tileset
 Return the custom properties of @var{tileset}.
 @end deffn
@@ -2641,6 +2650,18 @@ Return the animation for @var{tile}.
 Return the custom properties of @var{tile}.
 @end deffn
 
+@deffn {Procedure} animation? obj
+Return @code{#t} if @var{obj} is an animation.
+@end deffn
+
+@deffn {Procedure} animation-frames animation
+Return a vector of frames in @var{animation}.
+@end deffn
+
+@deffn {Procedure} animation-duration animation
+Return the duration of @var{animation}.
+@end deffn
+
 @deffn {Procedure} animation-frame? obj
 Return @code{#t} if @var{obj} is an animation frame.
 @end deffn
diff --git a/examples/images/serene-village.png b/examples/images/serene-village.png
new file mode 100644
index 0000000..d94cb31
Binary files /dev/null and b/examples/images/serene-village.png differ
diff --git a/examples/images/tiles.png b/examples/images/tiles.png
deleted file mode 100644
index d8a3dfd..0000000
Binary files a/examples/images/tiles.png and /dev/null differ
diff --git a/examples/maps/example.tmx b/examples/maps/example.tmx
index 6c8bc3d..4a3a77a 100644
--- a/examples/maps/example.tmx
+++ b/examples/maps/example.tmx
@@ -1,96 +1,274 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<map version="1.0" tiledversion="1.1.0" orientation="orthogonal" renderorder="right-up" width="20" height="15" tilewidth="16" tileheight="16" infinite="0" nextobjectid="1">
- <tileset firstgid="1" name="tiles" tilewidth="16" tileheight="16" tilecount="1440" columns="40">
-  <image source="../images/tiles.png" width="640" height="576"/>
-  <terraintypes>
-   <terrain name="grass" tile="0"/>
-   <terrain name="dark-grass" tile="1"/>
-   <terrain name="tree" tile="1"/>
-   <terrain name="nothing" tile="1"/>
-  </terraintypes>
-  <tile id="0" terrain="0,0,0,0"/>
-  <tile id="360" terrain="0,0,0,1"/>
-  <tile id="361" terrain="0,0,1,0"/>
-  <tile id="400" terrain="0,1,0,0"/>
-  <tile id="401" terrain="1,0,0,0"/>
-  <tile id="642" terrain="2,2,2,2"/>
-  <tile id="643" terrain="3,2,2,2"/>
-  <tile id="644" terrain="2,3,2,2"/>
-  <tile id="645" terrain="3,3,3,2"/>
-  <tile id="646" terrain="3,3,2,3"/>
-  <tile id="648" terrain="3,3,3,3"/>
-  <tile id="685" terrain="3,2,3,3"/>
-  <tile id="686" terrain="2,3,3,3"/>
-  <tile id="725" terrain="3,3,2,2"/>
-  <tile id="1174" terrain="0,0,0,1"/>
-  <tile id="1175" terrain="0,0,1,1"/>
-  <tile id="1176" terrain="0,0,1,0"/>
-  <tile id="1214" terrain="0,1,0,1"/>
-  <tile id="1215" terrain="1,1,1,1"/>
-  <tile id="1216" terrain="1,0,1,0"/>
-  <tile id="1254" terrain="0,1,0,0"/>
-  <tile id="1255" terrain="1,1,0,0"/>
-  <tile id="1256" terrain="1,0,0,0"/>
-  <tile id="1294" terrain="1,1,1,0"/>
-  <tile id="1295" terrain="1,1,0,1"/>
-  <tile id="1334" terrain="1,0,1,1"/>
-  <tile id="1335" terrain="0,1,1,1"/>
- </tileset>
- <layer name="background" width="20" height="15">
+<map version="1.5" tiledversion="1.5.0" orientation="orthogonal" renderorder="right-down" width="50" height="50" tilewidth="32" tileheight="32" infinite="0" nextlayerid="6" nextobjectid="1">
+ <tileset firstgid="1" source="serene-village.tsx"/>
+ <layer id="1" name="Water" width="50" height="50">
   <data encoding="csv">
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 </data>
  </layer>
 </map>
diff --git a/examples/maps/serene-village.tsx b/examples/maps/serene-village.tsx
new file mode 100644
index 0000000..aec16da
--- /dev/null
+++ b/examples/maps/serene-village.tsx
@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<tileset version="1.5" tiledversion="1.5.0" name="Serene Village" tilewidth="32" tileheight="32" tilecount="855" columns="19">
+ <image source="../images/serene-village.png" width="608" height="1440"/>
+ <tile id="209">
+  <animation>
+   <frame tileid="209" duration="100"/>
+   <frame tileid="210" duration="100"/>
+   <frame tileid="211" duration="100"/>
+   <frame tileid="212" duration="100"/>
+   <frame tileid="213" duration="100"/>
+   <frame tileid="214" duration="100"/>
+   <frame tileid="215" duration="100"/>
+   <frame tileid="216" duration="100"/>
+   <frame tileid="217" duration="100"/>
+   <frame tileid="218" duration="100"/>
+   <frame tileid="219" duration="100"/>
+   <frame tileid="220" duration="100"/>
+   <frame tileid="221" duration="100"/>
+   <frame tileid="222" duration="100"/>
+  </animation>
+ </tile>
+ <tile id="718">
+  <animation>
+   <frame tileid="718" duration="100"/>
+   <frame tileid="719" duration="100"/>
+   <frame tileid="720" duration="100"/>
+   <frame tileid="721" duration="100"/>
+  </animation>
+ </tile>
+ <wangsets>
+  <wangset name="Unnamed Set" type="corner" tile="-1">
+   <wangcolor name="Grass" color="#ff0000" tile="-1" probability="1"/>
+   <wangcolor name="Water" color="#00ff00" tile="-1" probability="1"/>
+   <wangcolor name="Dirt" color="#0000ff" tile="-1" probability="1"/>
+   <wangtile tileid="3" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="4" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="5" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="20" wangid="0,1,0,1,0,1,0,0"/>
+   <wangtile tileid="21" wangid="0,0,0,1,0,1,0,1"/>
+   <wangtile tileid="22" wangid="0,1,0,1,0,1,0,3"/>
+   <wangtile tileid="23" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="24" wangid="0,3,0,1,0,1,0,1"/>
+   <wangtile tileid="25" wangid="0,3,0,1,0,3,0,3"/>
+   <wangtile tileid="26" wangid="0,3,0,1,0,1,0,3"/>
+   <wangtile tileid="27" wangid="0,3,0,1,0,1,0,3"/>
+   <wangtile tileid="28" wangid="0,3,0,3,0,1,0,3"/>
+   <wangtile tileid="39" wangid="0,1,0,1,0,0,0,1"/>
+   <wangtile tileid="40" wangid="0,1,0,0,0,1,0,1"/>
+   <wangtile tileid="41" wangid="0,1,0,1,0,3,0,1"/>
+   <wangtile tileid="42" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="43" wangid="0,1,0,3,0,1,0,1"/>
+   <wangtile tileid="44" wangid="0,1,0,1,0,3,0,3"/>
+   <wangtile tileid="45" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="46" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="47" wangid="0,3,0,3,0,1,0,1"/>
+   <wangtile tileid="48" wangid="0,3,0,3,0,3,0,3"/>
+   <wangtile tileid="60" wangid="0,1,0,1,0,3,0,3"/>
+   <wangtile tileid="61" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="62" wangid="0,3,0,3,0,1,0,1"/>
+   <wangtile tileid="63" wangid="0,1,0,3,0,3,0,3"/>
+   <wangtile tileid="64" wangid="0,1,0,3,0,3,0,1"/>
+   <wangtile tileid="65" wangid="0,1,0,3,0,3,0,1"/>
+   <wangtile tileid="66" wangid="0,3,0,3,0,3,0,1"/>
+   <wangtile tileid="79" wangid="0,0,0,1,0,0,0,0"/>
+   <wangtile tileid="80" wangid="0,0,0,1,0,1,0,0"/>
+   <wangtile tileid="81" wangid="0,0,0,1,0,1,0,0"/>
+   <wangtile tileid="82" wangid="0,0,0,1,0,1,0,0"/>
+   <wangtile tileid="83" wangid="0,0,0,1,0,1,0,0"/>
+   <wangtile tileid="84" wangid="0,0,0,0,0,1,0,0"/>
+   <wangtile tileid="98" wangid="0,1,0,1,0,0,0,0"/>
+   <wangtile tileid="99" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="100" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="101" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="102" wangid="0,1,0,1,0,1,0,1"/>
+   <wangtile tileid="103" wangid="0,0,0,0,0,1,0,1"/>
+   <wangtile tileid="117" wangid="0,1,0,0,0,0,0,0"/>
+   <wangtile tileid="118" wangid="0,1,0,0,0,0,0,1"/>
+   <wangtile tileid="119" wangid="0,1,0,0,0,0,0,1"/>
+   <wangtile tileid="120" wangid="0,1,0,0,0,0,0,1"/>
+   <wangtile tileid="121" wangid="0,1,0,0,0,0,0,1"/>
+   <wangtile tileid="122" wangid="0,0,0,0,0,0,0,1"/>
+  </wangset>
+ </wangsets>
+</tileset>
diff --git a/examples/tile-map.scm b/examples/tile-map.scm
new file mode 100644
index 0000000..52d6b94
--- /dev/null
+++ b/examples/tile-map.scm
@@ -0,0 +1,100 @@
+(use-modules (chickadee)
+             (chickadee math vector)
+             (chickadee math rect)
+             (chickadee graphics color)
+             (chickadee graphics font)
+             (chickadee graphics tile-map)
+             (ice-9 format)
+             (ice-9 match)
+             (srfi srfi-11))
+
+(define window-width 960)
+(define window-height 540)
+(define map #f)
+(define prev-camera (vec2 0.0 0.0))
+(define camera (vec2 0.0 0.0))
+(define render-camera (vec2 0.0 0.0))
+(define text-position (vec2 4.0 4.0))
+(define text "0, 0")
+(define (stats-message)
+  (format #f "fps: ~1,2f"
+          (/ 1.0 avg-frame-time)))
+(define start-time 0.0)
+(define avg-frame-time 16)
+(define stats-text (stats-message))
+(define stats-text-pos (vec2 4.0 (- window-height 16.0)))
+(define last-update start-time)
+(define scroll-speed 6.0)
+
+(define (load)
+  (set! map (load-tile-map "maps/example3.tmx")))
+
+(define (draw alpha)
+  ;; Linearly interpolate between the current camera position and the
+  ;; previous camera position based on the alpha value.  This makes
+  ;; the scrolling appear much smoother because the Chickadee game
+  ;; loop does not render in lock-step with updates.
+  (let ((beta (- 1.0 alpha)))
+    (set-vec2-x! render-camera
+                 (round
+                  (+ (* (vec2-x camera) alpha)
+                     (* (vec2-x prev-camera) beta))))
+    (set-vec2-y! render-camera
+                 (round
+                  (+ (* (vec2-y camera) alpha)
+                     (* (vec2-y prev-camera) beta)))))
+  (draw-tile-map map #:camera render-camera)
+  (draw-text text text-position #:color black)
+  (draw-text stats-text stats-text-pos #:color black)
+  (let ((current-time (elapsed-time)))
+    (set! avg-frame-time
+          (+ (* (- current-time start-time) 0.1)
+             (* avg-frame-time 0.9)))
+    (set! start-time current-time)
+    (when (>= (- current-time last-update) 1.0)
+      (set! stats-text (stats-message))
+      (set! last-update current-time))))
+
+(define (refresh-tile-coords x y)
+  (call-with-values (lambda ()
+                      (point->tile map
+                                   (+ x (vec2-x camera))
+                                   (+ y (vec2-y camera))))
+    (lambda (tx ty)
+      (set! text (format #f "~d, ~d" tx ty)))))
+
+(define (update dt)
+  (vec2-copy! camera prev-camera)
+  (set-vec2! camera
+             (min (max (+ (vec2-x camera)
+                          (if (key-pressed? 'right) scroll-speed 0.0)
+                          (if (key-pressed? 'left) (- scroll-speed) 0.0))
+                       0.0)
+                  (- (* (tile-map-width map) (tile-map-tile-width map))
+                     window-width))
+             (min (max (+ (vec2-y camera)
+                          (if (key-pressed? 'up) scroll-speed 0.0)
+                          (if (key-pressed? 'down) (- scroll-speed) 0.0))
+                       0.0)
+                  (- (* (tile-map-height map) (tile-map-tile-height map))
+                     window-height)))
+  (when (or (key-pressed? 'left) (key-pressed? 'right)
+            (key-pressed? 'down) (key-pressed? 'up))
+    (refresh-tile-coords (mouse-x) (mouse-y))))
+
+(define (key-press key modifiers repeat?)
+  (match key
+    ((or 'escape 'q) (abort-game))
+    (_ #t)))
+
+(define (mouse-move x y x-rel y-rel buttons)
+  (refresh-tile-coords x y))
+
+(run-game #:window-width window-width
+          #:window-height window-height
+          #:window-title "tile map demo"
+          #:load load
+          #:draw draw
+          #:update update
+          #:key-press key-press
+          #:mouse-move mouse-move)
diff --git a/examples/tiled.scm b/examples/tiled.scm
deleted file mode 100644
index c528f74..0000000
--- a/examples/tiled.scm
+++ /dev/null
@@ -1,81 +0,0 @@
-(use-modules (chickadee)
-             (chickadee math vector)
-             (chickadee math rect)
-             (chickadee graphics color)
-             (chickadee graphics font)
-             (chickadee graphics tiled)
-             (ice-9 format)
-             (ice-9 match)
-             (srfi srfi-11))
-
-(define map #f)
-(define prev-camera (vec2 0.0 0.0))
-(define camera (vec2 0.0 0.0))
-(define render-camera (vec2 0.0 0.0))
-(define text-position (vec2 4.0 4.0))
-(define text "0, 0")
-(define (stats-message)
-  (format #f "fps: ~1,2f"
-          (/ 1.0 avg-frame-time)))
-(define start-time 0.0)
-(define avg-frame-time 16)
-(define stats-text (stats-message))
-(define stats-text-pos (vec2 4.0 464.0))
-(define last-update start-time)
-(define scroll-speed 6.0)
-
-(define (load)
-  (set! map (load-tile-map "maps/example.tmx")))
-
-(define (draw alpha)
-  ;; Linearly interpolate between the current camera position and the
-  ;; previous camera position based on the alpha value.  This makes
-  ;; the scrolling appear much smoother because the Chickadee game
-  ;; loop does not render in lock-step with updates.
-  (let ((beta (- 1.0 alpha)))
-    (set-vec2-x! render-camera
-                 (+ (* (vec2-x camera) alpha)
-                    (* (vec2-x prev-camera) beta)))
-    (set-vec2-y! render-camera
-                 (+ (* (vec2-y camera) alpha)
-                    (* (vec2-y prev-camera) beta))))
-  (draw-tile-map map #:camera render-camera)
-  (draw-text text text-position #:color black)
-  (draw-text stats-text stats-text-pos #:color black)
-  (let ((current-time (elapsed-time)))
-    (set! avg-frame-time
-          (+ (* (- current-time start-time) 0.1)
-             (* avg-frame-time 0.9)))
-    (set! start-time current-time)
-    (when (>= (- current-time last-update) 1000)
-      (set! stats-text (stats-message))
-      (set! last-update current-time))))
-
-(define (update dt)
-  (vec2-copy! camera prev-camera)
-  (set-vec2-x! camera
-               (+ (vec2-x camera)
-                  (if (key-pressed? 'right) scroll-speed 0.0)
-                  (if (key-pressed? 'left) (- scroll-speed) 0.0)))
-  (set-vec2-y! camera
-               (+ (vec2-y camera)
-                  (if (key-pressed? 'up) scroll-speed 0.0)
-                  (if (key-pressed? 'down) (- scroll-speed) 0.0))))
-
-(define (key-press key modifiers repeat?)
-  (match key
-    ((or 'escape 'q) (abort-game))
-    (_ #t)))
-
-(define (mouse-move x y x-rel y-rel buttons)
-  (let-values (((tx ty) (point->tile map (- x (vec2-x camera)) (- y (vec2-y camera)))))
-    (set! text (format #f "~d, ~d" tx ty))))
-
-(run-game #:window-width 640
-          #:window-height 480
-          #:window-title "tile map demo"
-          #:load load
-          #:draw draw
-          #:update update
-          #:key-press key-press
-          #:mouse-move mouse-move)
-- 
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