Add tile map example.

1 files changed, 106 insertions, 0 deletions

diff --git a/examples/tilemap.scm b/examples/tilemap.scm
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+++ b/examples/tilemap.scm
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+(use-modules (figl gl)
+             (srfi srfi-1)
+             (srfi srfi-9)
+             (srfi srfi-42)
+             (ice-9 format)
+             (2d sprite)
+             (2d game-loop)
+             (2d window)
+             (2d vector)
+             (2d input)
+             (2d helpers))
+
+;;;
+;;; 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.
+
+;; tiles is a 2d array of texture regions.
+(define-record-type <map-layer>
+  (make-map-layer width height tile-width tile-height tiles)
+  map-layer?
+  (width map-layer-width)
+  (height map-layer-height)
+  (tile-width map-layer-tile-width)
+  (tile-height map-layer-tile-height)
+  (tiles map-layer-tiles))
+
+(define draw-map-layer
+  (let ((batch (make-sprite-batch)))
+    (lambda (layer)
+      (with-sprite-batch batch
+        (do-ec (: y (map-layer-height layer))
+               (: x (map-layer-width layer))
+               (let ((tile (array-ref (map-layer-tiles layer) y x)))
+                 (sprite-batch-draw batch
+                                    (texture-region-texture tile)
+                                    (* x (map-layer-tile-width layer))
+                                    (* y (map-layer-tile-height layer))
+                                    0
+                                    0
+                                    (texture-region-width tile)
+                                    (texture-region-height tile)
+                                    1
+                                    1
+                                    0
+                                    (texture-region-u tile)
+                                    (texture-region-v tile)
+                                    (texture-region-u2 tile)
+                                    (texture-region-v2 tile))))))))
+
+;; A small 8x8 array of tile indices.
+(define map-width 8)
+(define map-height 8)
+(define map-tiles
+  #2u32((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 map #f)
+
+(define (tiles->texture-regions width height tileset tiles)
+  (list->array
+   2
+   (list-ec
+    (: y height)
+    (list-ec
+     (: x width)
+     (vector-ref tileset (array-ref tiles y x))))))
+
+(define (key-down key mod unicode)
+  (cond ((any-equal? key (keycode escape) (keycode q))
+         (close-window)
+         (quit))))
+
+(define (render)
+  (with-gl-push-matrix
+   (gl-translate 100 100 0)
+   (draw-map-layer map)))
+
+(define window-width 800)
+(define window-height 600)
+
+(set-key-down-callback (lambda (key mod unicode) (key-down key mod unicode)))
+(set-render-callback (lambda () (render)))
+(open-window window-width window-height)
+
+;; Load tileset and build map layer
+(let* ((texture (load-texture "images/tiles.png"))
+       (tileset (split-texture texture 32 32)))
+  (set! map (make-map-layer map-width map-height tile-width tile-height
+                            (tiles->texture-regions map-width
+                                                    map-height
+                                                    tileset
+                                                    map-tiles))))
+
+(run-game-loop)