1 files changed, 103 insertions, 0 deletions
diff --git a/libpsn00b/psxgpu/drawsynccallback.s b/libpsn00b/psxgpu/drawsynccallback.s
new file mode 100644
index 0000000..c1e28fe
--- /dev/null
+++ b/libpsn00b/psxgpu/drawsynccallback.s
@@ -0,0 +1,103 @@
+.set noreorder
+
+.include "hwregs_a.h"
+
+.text
+
+.global DrawSyncCallback
+.type DrawSyncCallback, @function
+DrawSyncCallback:
+
+	addiu	$sp, -8
+	sw		$ra, 0($sp)
+	sw		$a0, 4($sp)
+	
+	jal		EnterCriticalSection
+	nop
+	
+	beqz	$a0, .Luninstall
+	nop
+	la		$a1, _drawsync_handler
+	jal		DMACallback
+	li		$a0, 2
+	b		.Lcontinue
+	nop
+	
+.Luninstall:
+
+	move	$a1, $0
+	jal		DMACallback
+	li		$a0, 2
+
+.Lcontinue:
+
+	lw		$a0, 4($sp)
+	la		$v1, _drawsync_func
+	lw		$v0, 0($v1)
+	sw		$a0, 0($v1)
+	sw		$v0, 4($sp)
+	
+.Lexit:
+
+	jal		ExitCriticalSection
+	nop
+	
+	lw		$ra, 0($sp)
+	lw		$v0, 4($sp)
+	jr		$ra
+	addiu	$sp, 8
+	
+	
+.type _drawsync_handler, @function
+_drawsync_handler:
+
+.Ldma_wait:
+
+	la		$v0, _drawsync_func
+	lw		$v0, 0($v0)
+	nop
+	beqz	$v0, .Lskip
+	nop
+
+	addiu	$sp, -4
+	sw		$ra, 0($sp)
+
+	lw		$v0, D2_CHCR($a0)
+	nop
+	srl		$v0, 24
+	andi	$v0, 0x1
+	
+	bnez	$v0, .Ldma_wait
+	nop
+
+.Lgpu_wait:
+	jal		ReadGPUstat
+	nop
+	srl		$v0, 28
+	andi	$v0, 0x1
+	beqz	$v0, .Lgpu_wait
+	nop
+	
+	la		$v1, _drawsync_func
+	lw		$v1, 0($v1)
+	
+	lui		$v0, 0x0400			# Set DMA direction to off
+	sw		$v0, GP1($a0)
+	
+	jalr	$v1
+	nop
+	
+	lw		$ra, 0($sp)
+	addiu	$sp, 4
+	
+.Lskip:
+
+	jr		$ra
+	nop
+	
+
+.data
+
+_drawsync_func:
+	.word 0
+	
+\ No newline at end of file