mirror of
https://github.com/RaySollium99/picodrive.git
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6fc5714482
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@415 be3aeb3a-fb24-0410-a615-afba39da0efa
135 lines
3.1 KiB
ArmAsm
135 lines
3.1 KiB
ArmAsm
# vim:filetype=mips
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# some asm utils
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# (c) Copyright 2007, Grazvydas "notaz" Ignotas
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# All Rights Reserved
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.set noreorder
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.set noat
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.data
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.align 4
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.byte 0, 1, 6, 11, 16, 21, 26, 31 # -4
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.byte 0, 2, 7, 12, 16, 21, 26, 31 # -3
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.byte 0, 3, 7, 12, 17, 22, 26, 31 # -2
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.byte 0, 4, 8, 13, 17, 22, 26, 31 # -1
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pal_gmtab:
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.byte 0, 5, 10, 15, 16, 21, 26, 31 # 0
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.byte 0, 6, 10, 15, 19, 23, 27, 31
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.byte 0, 7, 11, 15, 19, 23, 27, 31
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.byte 0, 8, 12, 16, 19, 23, 27, 31
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.byte 0, 9, 12, 16, 20, 24, 27, 31
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.byte 0, 10, 13, 17, 20, 24, 27, 31
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.byte 0, 10, 14, 17, 21, 24, 28, 31
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.byte 0, 11, 15, 18, 21, 24, 28, 31
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.byte 0, 12, 15, 18, 22, 25, 28, 31
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.byte 0, 13, 16, 19, 22, 25, 28, 31
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.byte 0, 14, 17, 20, 22, 25, 28, 31 # 10
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.byte 0, 15, 17, 20, 23, 26, 28, 31
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.byte 0, 16, 18, 21, 23, 26, 28, 31
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.byte 0, 16, 19, 21, 24, 26, 29, 31
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.byte 0, 17, 20, 22, 24, 26, 29, 31
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.byte 0, 18, 20, 22, 25, 27, 29, 31
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.byte 0, 19, 21, 23, 25, 27, 29, 31 # 16
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.text
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.align 4
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# bbbb bggg gggr rrrr
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#.global pal_gmtab
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.global do_pal_convert # dest, src, gammaa_val, black_lvl
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do_pal_convert:
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bnez $a2, dpc_gma
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li $t0, 64/2
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bnez $a3, dpc_gma
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lui $t2, 0x00e
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ori $t2, 0x00e
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lui $t3, 0x006
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ori $t3, 0x006
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lui $t4, 0x0e0
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ori $t4, 0x0e0
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lui $t6, 0xe00
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ori $t6, 0xe00
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lui $t7, 0x600
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ori $t7, 0x600
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dpc_loop:
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lw $v0, 0($a1)
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addiu $a1, 4
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and $v1, $v0, $t2 # r
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sll $v1, 1
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and $t9, $v0, $t3
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srl $t9, 1
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or $v1, $t9 # r
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and $t9, $v0, $t4 # g
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sll $t8, $t9, 3
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or $v1, $t8
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or $v1, $t9 # g
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and $t9, $v0, $t6 # b
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sll $t9, 4
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or $v1, $t9
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and $t9, $v0, $t7
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sll $t9, 2
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or $v1, $t9 # b
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sw $v1, 0($a0)
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addiu $t0, -1
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bnez $t0, dpc_loop
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addiu $a0, 4
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jr $ra
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nop
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# non-zero gamma
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dpc_gma:
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slt $t2, $a2, $0
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sll $a2, 3
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lui $t1, %hi(pal_gmtab)
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addiu $t1, %lo(pal_gmtab)
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addu $a2, $t1
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beqz $a3, dpc_gma_loop
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sb $0, 0($a2) # black level 0
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bnez $t2, dpc_gma_loop # gamma < 0, keep black at 0
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addiu $a3, -2
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slt $t2, $a3, $0 # t2 = a3_orig == 1 ? 1 : 0
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lb $t1, 1($a2)
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addiu $t1, -2
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srlv $t1, $t1, $t2
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sb $t1, 0($a2)
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dpc_gma_loop:
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lw $v0, 0($a1)
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addiu $a1, 4
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ext $v1, $v0, 1, 3
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addu $v1, $a2
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lb $v1, 0($v1)
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ext $t1, $v0, 5, 3
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addu $t1, $a2
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lb $t1, 0($t1)
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ext $t2, $v0, 9, 3
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addu $t2, $a2
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lb $t2, 0($t2)
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ext $t3, $v0, 17, 3
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addu $t3, $a2
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lb $t3, 0($t3)
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ext $t4, $v0, 21, 3
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addu $t4, $a2
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lb $t4, 0($t4)
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ext $t5, $v0, 25, 3
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addu $t5, $a2
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lb $t5, 0($t5)
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ins $v1, $t1, 6, 5
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ins $v1, $t2, 11, 5
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ins $v1, $t3, 16, 5
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ins $v1, $t4, 22, 5
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ins $v1, $t5, 27, 5
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sw $v1, 0($a0)
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addiu $t0, -1
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bnez $t0, dpc_gma_loop
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addiu $a0, 4
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jr $ra
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nop
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