First commit

1 files changed, 45 insertions, 0 deletions

diff --git a/libpsn00b/psxgte/initgeom.s b/libpsn00b/psxgte/initgeom.s
new file mode 100644
index 0000000..14ca293
--- /dev/null
+++ b/libpsn00b/psxgte/initgeom.s
@@ -0,0 +1,45 @@
+.set noreorder
+
+.include "gtereg.h"
+
+.section .text
+
+
+.global InitGeom
+.type InitGeom, @function
+InitGeom:
+	addiu	$sp, -4
+	sw		$ra, 0($sp)
+
+	jal		EnterCriticalSection
+	nop
+
+	mfc0	$v0, $12				# Get SR
+	lui		$v1, 0x4000				# Set bit to enable cop2
+	or		$v0, $v1
+	mtc0	$v0, $12				# Set new SR
+
+	jal		ExitCriticalSection
+	nop
+
+	ctc2	$0 , $24				# Reset GTE offset
+	ctc2	$0 , $25
+
+	li		$v0, 320				# Set default projection plane
+	ctc2	$v0, $26
+
+	li		$v0, 0x155				# Set ZSF3 and ZSF4 defaults
+	ctc2	$v0, $29
+	li		$v0, 0x100
+	ctc2	$v0, $30
+
+	li		$v0, 0xef9e				# DQA and DQB defaults
+	lui		$v1, 0x0140
+	ctc2	$v0, C2_DQA
+	ctc2	$v1, C2_DQB
+
+	lw		$ra, 0($sp)
+	addiu	$sp, 4
+	jr		$ra
+	nop
+