;;; Sly
;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; This program 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.
;;;
;;; This program 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/>.

(use-modules (ice-9 match)
             (srfi srfi-1)
             (srfi srfi-9)
             (srfi srfi-42)
             (sly game)
             (sly sprite)
             (sly texture)
             (sly tileset)
             (sly vector)
             (sly window)
             (sly scene)
             (sly signal)
             (sly camera)
             (sly color)
             (sly transition)
             (sly utils)
             (sly keyboard))

(load "common.scm")

;;;
;;; Orthogonal tile map example
;;;

;; This is a quick and dirty tile map implementation. No fancy map
;; loading. Just a hardcoded tile map that demonstrates the
;; split-texture procedure.

;; A small 8x8 array of tile indices.
(define map-width 8)
(define map-height 8)
(define map-tiles
  #2((00 01 01 01 01 01 01 02)
     (16 17 17 17 17 17 17 18)
     (16 17 17 17 17 17 17 18)
     (16 17 17 48 49 17 17 18)
     (16 17 17 64 65 17 17 18)
     (16 17 17 17 17 17 17 18)
     (16 17 17 17 17 17 17 18)
     (32 33 33 33 33 33 33 34)))

(define tile-width 32)
(define tile-height 32)

(define (random-map width height tileset)
  (let ((tiles (make-array 0 height width))
        (n (vector-length (tileset-tiles tileset))))
    (do-ec (: y height) (: x width)
           (array-set! tiles (random n) y x))
    tiles))

(define (build-map-layer tiles tileset)
  (define build-sprite
    (memoize
     (lambda (tile-index)
       (let ((texture (tileset-ref tileset tile-index)))
         (make-sprite texture #:anchor #(0 0))))))

  (define (build-tile x y)
    (scene-node
     (position (vector (* x (tileset-width tileset))
                       (* y (tileset-height tileset))))
     (uniforms `(("color" ,white)))
     (children (list (build-sprite (array-ref tiles y x))))))

  (match (array-dimensions tiles)
    ((height width)
     (scene-node
      (children
       (list-ec (: x width) (: y height)
                (build-tile x y)))))))

(define tileset (load-tileset "images/tiles.png" 32 32))

(define-signal map-scene
  (scene-root
   (scene-node
    (position
     (vector (- 320 (* tile-width 4))
             (- 240 (* tile-height 4))))
    (children
     (list (build-map-layer map-tiles tileset))))))

(define-signal camera
  (orthographic-camera map-scene 640 480))

(with-window (make-window #:title "Tilemap")
  (start-game-loop camera))

;;; Local Variables:
;;; compile-command: "../pre-inst-env guile tilemap.scm"
;;; End: