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.set noreorder
.include "hwregs_a.h"
.set DISP_dx, 0
.set DISP_dy, 2
.set DISP_dw, 4
.set DISP_dh, 6
.set DISP_sx, 8
.set DISP_sy, 10
.set DISP_sw, 12
.set DISP_sh, 14
.set DISP_inter, 16
.set DISP_isrgb24, 17
.set DISP_reverse, 18
.section .text
.global PutDispEnv
.type PutDispEnv, @function
PutDispEnv:
lui $a3, IOBASE
# Horizontal resolution stuff
lh $a2, DISP_dw($a0) # Get X resolution
lh $v0, DISP_sx($a0)
lh $v1, DISP_sw($a0) # Get X screen width
move $a1, $0 # To use as mode value
bgt $a2, 560, .Lmode_640
nop
bgt $a2, 400, .Lmode_512
nop
bgt $a2, 352, .Lmode_384
nop
bgt $a2, 280, .Lmode_320
nop
.set noat
.Lmode_256:
li $at, 10
mult $at, $v1
li $a2, 0x24e
sll $v0, 2
add $a2, $v0
b .Lmode_end
li $v1, 0xa00
.Lmode_320:
li $at, 8
mult $at, $v1
li $a2, 0x258
ori $a1, 0x01
sll $v0, 2
add $a2, $v0
b .Lmode_end
li $v1, 0xa00
.Lmode_384:
li $at, 7
mult $at, $v1
li $a2, 0x21b
ori $a1, 0x64
sll $v0, 2
add $a2, $v0
b .Lmode_end
li $v1, 0xa80
.Lmode_512:
li $at, 5
mult $at, $v1
li $a2, 0x267
ori $a1, 0x02
sll $v0, 2
add $a2, $v0
b .Lmode_end
li $v1, 0xa00
.Lmode_640:
li $at, 4
mult $at, $v1
li $a2, 0x26c
ori $a1, 0x03
sll $v0, 2
add $a2, $v0
li $v1, 0xa00
.Lmode_end:
.set at
mflo $v0
bnez $v0, .Lno_default # Check if screen with is non zero
nop
move $v0, $v1 # Use default if screen width is 0
.Lno_default:
addu $v0, $a2 # Apply horizontal display coordinates
sll $v0, 12
andi $a2, 0xfff
or $a2, $v0
lui $v0, 0x0600
or $v0, $a2
sw $v0, GPU_GP1($a3)
# Vertical resolution
lh $v0, DISP_dh($a0)
li $a2, 0x10
ble $v0, 256, .Lmode_low
nop
.Lmode_high:
ori $a1, 0x04
.Lmode_low:
lh $v0, DISP_sy($a0)
lh $v1, DISP_sh($a0)
add $a2, $v0
bnez $v1, .Lno_default_vert
nop
li $v1, 0xf0
.Lno_default_vert:
add $v1, $a2
and $a2, 0x3ff
sll $v1, 10
or $v1, $a2
lui $v0, 0x0700
or $v1, $v0
sw $v1, GPU_GP1($a3)
# Video mode
la $v0, _gpu_standard
lbu $v0, 0($v0)
nop
beqz $v0, .Lconfig_ntsc
nop
.Lconfig_pal:
ori $a1, 0x08
.Lconfig_ntsc:
lbu $v0, DISP_inter($a0)
lbu $v1, DISP_isrgb24($a0)
beqz $v0, .Lno_inter
nop
or $a1, 0x20
.Lno_inter:
beqz $v1, .Lno_rgb24
nop
or $a1, 0x10
.Lno_rgb24:
lbu $v0, DISP_inter($a0)
nop
beqz $v0, .Lno_reverse
nop
or $a1, 0x80
.Lno_reverse:
lui $v0, 0x800 # Apply mode
or $a1, $v0
sw $a1, GPU_GP1($a3)
lhu $v0, DISP_dx($a0) # Set VRAM XY offset
lhu $v1, DISP_dy($a0)
andi $v0, 0x3ff
andi $v1, 0x1ff
sll $v1, 10
or $v0, $v1
lui $v1, 0x500
or $v0, $v1
jr $ra
sw $v0, GPU_GP1($a3)
|
