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With help, sub_81C795C has been tamed.

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Thanks to Garak on the discord server.
This commit is contained in:
Phlosioneer 2019-02-13 23:58:49 -05:00
parent a8d920cc45
commit f95eebf47a
1 changed files with 15 additions and 50 deletions
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65
src/pokenav_main.c
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@ -605,56 +605,21 @@ void CopyPaletteIntoBufferUnfaded(void *palette, u32 bufferOffset, u32 size) {
CpuCopy16(palette, gPlttBufferUnfaded + bufferOffset, size);
}
__attribute__((naked))
void sub_81C795C(struct PaletteDescriptor *palettes) {
// This code matches the assembly almost exactly; however, gcc chooses
// to store `index` in r0 instead of r1.
#ifdef NONMATCHING
struct PaletteDescriptor *current;
u32 offset;
u32 index;
current = palettes;
for (;;) {
if (current->palette == NULL) {
break;
}
index = AllocSpritePalette(current->tag);
if (index == 0xFF) {
break;
}
offset = (index * 16) + 0x100;
CopyPaletteIntoBufferUnfaded(current->palette, offset, 0x20);
current++;
}
#else // NONMATCHING
asm(".syntax unified\n\
push {r4,lr}\n\
adds r4, r0, 0\n\
b _081C7974\n\
_081C7962:\n\
lsls r0, r1, 4\n\
movs r2, 0x80\n\
lsls r2, 1\n\
adds r1, r0, r2\n\
ldr r0, [r4]\n\
movs r2, 0x20\n\
bl CopyPaletteIntoBufferUnfaded\n\
adds r4, 0x8\n\
_081C7974:\n\
ldr r0, [r4]\n\
cmp r0, 0\n\
beq _081C7988\n\
ldrh r0, [r4, 0x4]\n\
bl AllocSpritePalette\n\
lsls r0, 24\n\
lsrs r1, r0, 24\n\
cmp r1, 0xFF\n\
bne _081C7962\n\
_081C7988:\n\
pop {r4}\n\
pop {r0}\n\
bx r0\n\
.syntax divided");
#endif // NONMATCHING
u32 index;
for (current = palettes; current->palette != NULL; current++)
{
index = AllocSpritePalette(current->tag);
if (index == 0xFF)
{
break;
}
else
{
index = (index * 16) + 0x100;
CopyPaletteIntoBufferUnfaded(current->palette, index, 0x20);
}
}
}