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@@ -0,0 +1,122 @@
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+# vim:filetype=mips
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+
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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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+
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+.set noreorder
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+.set noat
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+
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+.data
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+.align 4
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+
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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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+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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+
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+.text
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+.align 4
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+
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+# bbbb bggg gggr rrrr
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+
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+.global do_pal_convert # dest, src, gammaa_val
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+
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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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+ 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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+
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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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+
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+ jr $ra
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+ nop
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+
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+dpc_gma:
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+ sll $a2, 3
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+ lui $t1, %hi(gmtab)
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+ addiu $t1, %lo(gmtab)
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+ addu $a2, $t1
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+
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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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+
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+ jr $ra
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+ nop
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+
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