From f3e040230772f978540a71aea43dfde200992922 Mon Sep 17 00:00:00 2001
From: "John Wilbert M. Villamor" <lameguy64@gmail.com>
Date: Sat, 6 Apr 2019 10:11:07 +0800
Subject: First commit

---
 libpsn00b/psxgpu/putdispenvraw.s | 71 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 libpsn00b/psxgpu/putdispenvraw.s

(limited to 'libpsn00b/psxgpu/putdispenvraw.s')

diff --git a/libpsn00b/psxgpu/putdispenvraw.s b/libpsn00b/psxgpu/putdispenvraw.s
new file mode 100644
index 0000000..157150d
--- /dev/null
+++ b/libpsn00b/psxgpu/putdispenvraw.s
@@ -0,0 +1,71 @@
+.set noreorder
+.set noat
+
+.include "hwregs_a.h"
+
+.set DISP_mode,		0
+.set DISP_vxpos,	4
+.set DISP_vypos,	6
+.set DISP_fbx,		8
+.set DISP_fby,		10
+
+.section .text
+
+
+.global PutDispEnvRaw
+.type PutDispEnvRaw, @function
+PutDispEnvRaw:
+	addiu	$sp, -8
+	sw		$ra, 0($sp)
+	sw		$s0, 4($sp)
+
+	lui		$s0, 0x1f80
+
+	lh		$at, DISP_vxpos($a0)	# Set horizontal display range
+	li		$v0, 608
+	add		$v0, $at
+	li		$v1, 3168
+	add		$v1, $at
+	sll		$v1, 12
+	or		$v0, $v1
+	lui		$v1, 0x600
+	or		$v1, $v0
+	sw		$v1, GP1($s0)
+
+	lh		$at, DISP_vypos($a0)	# Set vertical display range (for NTSC)
+	li		$v1, 120				# (values differet for PAL modes)
+	sub		$v1, $at
+	li		$v0, 136
+	sub		$v0, $v1
+	andi	$v0, 0x1ff
+	li		$v1, 120
+	add		$v1, $at
+	li		$at, 136
+	add		$at, $v1
+	andi	$at, 0x1ff
+	sll		$at, 10
+	or		$v0, $at
+	lui		$at, 0x700
+	or		$v0, $at
+	sw		$v0, GP1($s0)
+
+	lw		$v0, DISP_mode($a0)		# Set video mode
+	lui		$at, 0x800
+	or		$v0, $at
+	sw		$v0, GP1($s0)
+
+	lhu		$v0, DISP_fbx($a0)		# Set VRAM XY offset
+	lhu		$v1, DISP_fby($a0)
+	andi	$v0, 0x3ff
+	andi	$v1, 0x1ff
+	sll		$v1, 10
+	or		$v0, $v1
+	lui		$v1, 0x500
+	or		$v0, $v1
+	sw		$v0, GP1($s0)
+
+	lw		$ra, 0($sp)
+	lw		$s0, 4($sp)
+	jr		$ra
+	addiu	$sp, 8
+
-- 
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