git.y1.nz

commit 572c129995e70c7f338bbf5ee6698737274dce79
parent 23c7efba2837f8761eee6f797baa50684550fe95
Author: Toxa <untoxa@mail.ru>
Date:   Sat, 23 Jan 2021 01:43:17 +0300

_shadow_OAM_base = 0 disables DMA copying to OAM

Diffstat:
M
gbdk-lib/libc/gb/crt0.s
13
++++++++-----
M
gbdk-lib/libc/gb/metasprites.s
14
+++++++-------

2 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/gbdk-lib/libc/gb/crt0.s b/gbdk-lib/libc/gb/crt0.s
@@ -87,6 +87,7 @@ _wait_int_handler::
 	RETI
 
 	;; VBlank default interrupt routine
+__standard_VBL_handler::
 .std_vbl:
 	LD	HL,#.sys_time
 	INC	(HL)
@@ -94,11 +95,7 @@ _wait_int_handler::
 	INC	HL
 	INC	(HL)
 2$:
-	CALL	.refresh_OAM
-
-	LD	A,#0x01
-	LDH	(.vbl_done),A
-	RET
+	JP	.refresh_OAM
 
 	;; GameBoy Header
 
@@ -288,11 +285,17 @@ _set_interrupts::
 	;; Copy OAM data to OAM RAM
 .start_refresh_OAM:
 	LDH	A,(__shadow_OAM_base)
+	OR	A
+	JR	Z, 2$
+
 	LDH	(.DMA),A	; Put A into DMA registers
 	LD	A,#0x28		; We need to wait 160 ns
 1$:
 	DEC	A
 	JR	NZ,1$
+2$:	
+	INC	A
+	LDH	(.vbl_done),A
 	RET
 .end_refresh_OAM:
 
diff --git a/gbdk-lib/libc/gb/metasprites.s b/gbdk-lib/libc/gb/metasprites.s
@@ -1,14 +1,14 @@
-	.include	"global.s"
+        .include    "global.s"
 
-	.title  "Metasprites"
-	.module	Metasprites
+        .title  "Metasprites"
+        .module Metasprites
 
-	.area   _DATA
+        .area   _DATA
 
 ___current_metasprite:: 
-	.ds	0x02
+        .ds 0x02
 ___current_base_tile::
-	.ds	0x01
+        .ds 0x01
 ___render_shadow_OAM::
         .ds     0x01
 
@@ -17,7 +17,7 @@ ___render_shadow_OAM::
         ld      a, #>_shadow_OAM
         ld      (___render_shadow_OAM), a 
 
-	.area   _CODE
+        .area   _CODE
 
 ; UBYTE __move_metasprite(UINT8 id, UINT8 x, UINT8 y)
 

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