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Decompile colourBlend

This commit is contained in:
Ryan Dwyer 2020-06-15 20:58:20 +10:00
parent ee0740ad1d
commit a824af0f07
2 changed files with 16 additions and 59 deletions
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73
src/game/game_005fd0.c
View File

@ -609,64 +609,21 @@ glabel var7f1a7e6c
/* f0068fc: 00000000 */ sll $zero,$zero,0x0
);
GLOBAL_ASM(
glabel colourBlend
/* f006900: 00047e02 */ srl $t7,$a0,0x18
/* f006904: 31f800ff */ andi $t8,$t7,0xff
/* f006908: 03060019 */ multu $t8,$a2
/* f00690c: 240e00ff */ addiu $t6,$zero,0xff
/* f006910: 00054602 */ srl $t0,$a1,0x18
/* f006914: 310900ff */ andi $t1,$t0,0xff
/* f006918: 01c61823 */ subu $v1,$t6,$a2
/* f00691c: 00047402 */ srl $t6,$a0,0x10
/* f006920: 31cf00ff */ andi $t7,$t6,0xff
/* f006924: 00054402 */ srl $t0,$a1,0x10
/* f006928: 0000c812 */ mflo $t9
/* f00692c: 00000000 */ sll $zero,$zero,0x0
/* f006930: 00000000 */ sll $zero,$zero,0x0
/* f006934: 00690019 */ multu $v1,$t1
/* f006938: 310900ff */ andi $t1,$t0,0xff
/* f00693c: 00005012 */ mflo $t2
/* f006940: 032a5821 */ addu $t3,$t9,$t2
/* f006944: 000b6202 */ srl $t4,$t3,0x8
/* f006948: 00cf0019 */ multu $a2,$t7
/* f00694c: 00047a02 */ srl $t7,$a0,0x8
/* f006950: 31e800ff */ andi $t0,$t7,0xff
/* f006954: 000c6e00 */ sll $t5,$t4,0x18
/* f006958: 0000c012 */ mflo $t8
/* f00695c: 00000000 */ sll $zero,$zero,0x0
/* f006960: 00000000 */ sll $zero,$zero,0x0
/* f006964: 00690019 */ multu $v1,$t1
/* f006968: 0000c812 */ mflo $t9
/* f00696c: 03195021 */ addu $t2,$t8,$t9
/* f006970: 0005c202 */ srl $t8,$a1,0x8
/* f006974: 00c80019 */ multu $a2,$t0
/* f006978: 331900ff */ andi $t9,$t8,0xff
/* f00697c: 000a5a02 */ srl $t3,$t2,0x8
/* f006980: 308800ff */ andi $t0,$a0,0xff
/* f006984: 000b6400 */ sll $t4,$t3,0x10
/* f006988: 01ac7025 */ or $t6,$t5,$t4
/* f00698c: 00004812 */ mflo $t1
/* f006990: 00000000 */ sll $zero,$zero,0x0
/* f006994: 00000000 */ sll $zero,$zero,0x0
/* f006998: 00790019 */ multu $v1,$t9
/* f00699c: 30b900ff */ andi $t9,$a1,0xff
/* f0069a0: 00005012 */ mflo $t2
/* f0069a4: 012a5821 */ addu $t3,$t1,$t2
/* f0069a8: 000b6a02 */ srl $t5,$t3,0x8
/* f0069ac: 00c80019 */ multu $a2,$t0
/* f0069b0: 000d6200 */ sll $t4,$t5,0x8
/* f0069b4: 01cc7825 */ or $t7,$t6,$t4
/* f0069b8: 0000c012 */ mflo $t8
/* f0069bc: 00000000 */ sll $zero,$zero,0x0
/* f0069c0: 00000000 */ sll $zero,$zero,0x0
/* f0069c4: 00790019 */ multu $v1,$t9
/* f0069c8: 00004812 */ mflo $t1
/* f0069cc: 03095021 */ addu $t2,$t8,$t1
/* f0069d0: 000a5a02 */ srl $t3,$t2,0x8
/* f0069d4: 03e00008 */ jr $ra
/* f0069d8: 01eb1025 */ or $v0,$t7,$t3
);
/**
* Blends two colours together.
*
* The aweight argument is how much weight is given to colour A, on a scale of
* 0 to 255.
*/
u32 colourBlend(u32 a, u32 b, u32 aweight)
{
u32 bweight = 0xff - aweight;
return (((aweight * ((a >> 24) & 0xff) + bweight * ((b >> 24) & 0xff)) >> 8) << 24)
| (((aweight * ((a >> 16) & 0xff) + bweight * ((b >> 16) & 0xff)) >> 8) << 16)
| (((aweight * ((a >> 8) & 0xff) + bweight * ((b >> 8) & 0xff)) >> 8) << 8)
| ((aweight * (a & 0xff) + bweight * (b & 0xff)) >> 8);
}
GLOBAL_ASM(
glabel func0f0069dc

2
src/include/game/game_005fd0.h
View File

@ -7,7 +7,7 @@ bool func0f005fd0(s32 arg0);
s32 chrChooseFootstepSound(struct chrdata *chr, u32 arg1);
void func0f0061dc(struct chrdata *chr);
void func0f006520(struct chrdata *chr);
s32 colourBlend(u32 colour, u32 prevcolour, u32 arg2);
u32 colourBlend(u32 a, u32 b, u32 weight);
u32 func0f0069dc(void);
u32 func0f006b08(void);
u32 func0f006b54(void);