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;;; Chickadee Game Toolkit
;;; Copyright © 2018 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 render tiled)
#:use-module (chickadee math matrix)
#:use-module (chickadee math rect)
#:use-module (chickadee math vector)
#:use-module (chickadee render)
#:use-module (chickadee render color)
#:use-module (chickadee render sprite)
#:use-module (chickadee render texture)
#:use-module (chickadee render viewport)
#: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
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 animation properties)
tile?
(id tile-id)
(texture tile-texture)
(animation tile-animation)
(properties tile-properties))
(define-record-type <tileset>
(%make-tileset name first-gid size tile-width tile-height
atlas tiles properties)
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))
(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 (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)))
(load-image (scope source))))
(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 (parse-tile node rows columns atlas)
(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 (texture-atlas-ref atlas id)
animation properties)))
(define (parse-tiles nodes size columns atlas)
(let ((table (make-hash-table))
(tiles (make-vector size))
(rows (/ size columns)))
(for-each (lambda (node)
(let ((tile (parse-tile node rows columns atlas)))
(hash-set! table (tile-id tile) tile)))
nodes)
(let loop ((i 0))
(when (< i size)
(let ((tile
(or (hash-ref table i)
(%make-tile i (texture-atlas-ref atlas i) #f '()))))
(vector-set! tiles i tile))
(loop (+ i 1))))
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))
(tiles (parse-tiles ((sxpath '(tile)) node) size columns atlas))
(properties (map parse-property
((sxpath '(properties property)) node))))
(%make-tileset name first-gid size tile-width tile-height
atlas tiles properties)))
(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 gid tilesets x y tile-width tile-height)
(let* ((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 (let ((version (attr m 'version)))
(unless (string=? version "1.0")
(error "unsupported tiled map format version" version))
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)))
(let y-loop ((y y1))
(when (< y y2)
(let x-loop ((x x1))
(when (< x x2)
(let ((tile (vector-ref (tile-layer-tiles layer)
(+ (* y width) x))))
(when tile
(draw-sprite* (tile-texture (map-tile-ref tile))
(map-tile-rect tile)
matrix)))
(x-loop (+ x 1))))
(y-loop (+ y 1))))))
(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)))
(with-batched-sprites
(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)))
(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 %region (make-rect 0.0 0.0 0.0 0.0))
;; Make a default region that is as big as the viewport.
(define (default-region tile-map position)
(let ((vp (current-viewport)))
(set-rect-x! %region (- (vec2-x position)))
(set-rect-y! %region (- (vec2-y position)))
(set-rect-width! %region (viewport-width vp))
(set-rect-height! %region (viewport-height vp))
%region))
(define* (draw-tile-map tile-map
#:key
layers
(position %null-vec2)
(region (default-region tile-map position))
(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."
(matrix4-2d-transform! %matrix
#:origin origin
#:position position
#:rotation rotation
#:scale scale)
(draw-tile-map* tile-map %matrix region #:layers layers))
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