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authorlibjet <libj3t@gmail.com>2020-05-21 02:41:59 +0100
committerlibjet <libj3t@gmail.com>2020-05-21 02:41:59 +0100
commit3d99b8e8596b508621df807928a46e88b7afe3d1 (patch)
treed57a597fc7a2c9ae7e170e9068ce49d2753ca96e /engine
parent5d337102c45e6bdd6e75c037f94b38012fbe62db (diff)
Add place_graphic.asm
Diffstat (limited to 'engine')
-rwxr-xr-xengine/gfx/place_graphic.asm55
1 files changed, 55 insertions, 0 deletions
diff --git a/engine/gfx/place_graphic.asm b/engine/gfx/place_graphic.asm
new file mode 100755
index 00000000..4092ad35
--- /dev/null
+++ b/engine/gfx/place_graphic.asm
@@ -0,0 +1,55 @@
+PlaceGraphic:
+; Fill wBoxAlignment-aligned box width b height c
+; with iterating tile starting from hGraphicStartTile at hl.
+
+ ld de, SCREEN_WIDTH
+
+ ld a, [wBoxAlignment]
+ and a
+ jr nz, .right
+
+ ldh a, [hGraphicStartTile]
+.x1
+ push bc
+ push hl
+
+.y1
+ ld [hl], a
+ add hl, de
+ inc a
+ dec c
+ jr nz, .y1
+
+ pop hl
+ inc hl
+ pop bc
+ dec b
+ jr nz, .x1
+ ret
+
+.right
+; Right-aligned.
+ push bc
+ ld b, 0
+ dec c
+ add hl, bc
+ pop bc
+
+ ldh a, [hGraphicStartTile]
+.x2
+ push bc
+ push hl
+
+.y2
+ ld [hl], a
+ add hl, de
+ inc a
+ dec c
+ jr nz, .y2
+
+ pop hl
+ dec hl
+ pop bc
+ dec b
+ jr nz, .x2
+ ret