feat: add animation

main.asm

@@ -69,7 +69,7 @@ WaitVBlank:
 	ld bc, 160
 	ld d, 0
 	call Memset
-	
+
 	; Turn the LCD on
 	ld a, LCDCF_ON | LCDCF_BGON | LCDCF_OBJON | LCDCF_OBJ8
 	ld [rLCDC], a
@@ -88,6 +88,7 @@ WaitVBlank:
 	ldh [rIF], a
 	; Enable interrupts 
 	ei
+	jp Main
 
 Main::
 	call ResetShadowOAM
@@ -197,6 +198,21 @@ HandleInput::
 	ret
 
 HandleRender::
+	; Calculate current frame for player
+	ld a, [hFrameCounter]
+	and a, %0000_0111
+	cp a, 0
+	jr nz, .skipAnim
+
+	ld a, [wMetaspritePosition.frame]
+	inc a
+	cp PlayerMetasprite.framesEnd - PlayerMetasprite.framesStart
+	jr nz, .skipAnimReset
+	ld a, 0
+.skipAnimReset
+	ld [wMetaspritePosition.frame], a
+.skipAnim
+
 	; Render the player
 	; load de
 	ld a, [wMetaspritePosition.x]
@@ -216,7 +232,23 @@ HandleRender::
 	adc a, b
 	ld b, a
 
-	ld hl, CatMetasprite
+	; Add frameOffset
+	ld hl, PlayerMetasprite.framesStart
+	ld a, [wMetaspritePosition.frame]
+	add a, l
+	ld l, a
+	jr nc, .noCarry1
+	inc h
+.noCarry1
+	ld a, [hl]
+
+	ld hl, PlayerMetasprite
+	add a, l
+	ld l, a
+	jr nc, .noCarry2
+	inc h
+.noCarry2
+
 	call RenderMetasprite
 
 	; Render the shadow
@@ -379,11 +411,13 @@ VBlankInterrupt:
 
 SECTION "VBlank Handler", ROM0
 VBlankHandler:
-	ldh a, [hFrameCounter]
-
 	ld a, HIGH(wShadowOAM)
 	call hOAMDMA
 
+	ldh a, [hFrameCounter]
+	inc a
+	ldh [hFrameCounter], a
+
 	; Reset registers to orignal state
 	pop hl
 	pop de
@@ -407,68 +441,42 @@ Tilemap:
 	INCBIN "tileset.tilemap"
 TilemapEnd:
 
-SECTION "Level data", ROM0
-	db $03 ; width
-	db $03 ; height
-
-	; Each byte stores whether it is solid or not
-
-	; Z = 1
-	db $01
-	db $01
-	db $01
-
-	db $01
-	db $01
-	db $01
-
-	db $01
-	db $01
-	db $00
-
-	; Z = 2
-	db $01
-	db $01
-	db $01
-
-	db $01
-	db $01
-	db $01
-
-	db $00
-	db $00
-	db $00
-
-	; Z = 3
-	db $01
-	db $00
-	db $00
-
-	db $00
-	db $00
-	db $00
-
-	db $00
-	db $00
-	db $00
-
 
 SECTION "Graphics", ROM0
 GfxCat:
 	INCBIN "sprites.2bpp"
 .end::
 
-CatMetasprite:
-	db 0, 0, 2, 0
-	db 8, 0, 6, 0
-	db 128
-
 ShadowMetasprite:
 	db 12, 0, 1, 0
 	db 128
 
+PlayerMetasprite:
+.vertWalk1:
+	db 0, 0, 2, 0
+	db 8, 0, 6, 0
+	db 128
+.vertWalk2:
+	db 0, 0, 2, 0
+	db 8, 0, 7, 0
+	db 128
+.vertWalk3:
+	db 0, 0, 2, 0
+	db 8, 0, 6, 0
+	db 128
+.vertWalk4:
+	db 0, 0, 2, 0
+	db 8, 0, 8, 0
+	db 128
+.framesStart
+	db .vertWalk1 - PlayerMetasprite
+	db .vertWalk2 - PlayerMetasprite
+	db .vertWalk3 - PlayerMetasprite
+	db .vertWalk4 - PlayerMetasprite
+.framesEnd
+
 SECTION "Position Vars", WRAM0 
- wMetaspriteBegin:
+wMetaspriteBegin:
 ; Q12.4 fixed-point X posiition
 wMetaspritePosition::
 .x:
@@ -477,6 +485,8 @@ wMetaspritePosition::
 	dw
 .z:
 	dw
+.frame:
+	db
 
 ; Q4.4 fixed-point velocity
 wMetaspriteVelocity::