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Decompile func_812020C0 (tile->framebuffer blit) to C behind NON_MATCHING

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Graphics cluster: copies a tile's set (odd) pixels from D_8122C748's plane data
into the render target at +0x5B4, 4 pixels per step over an 0xB x 0xC region;
arg1 selects source plane and scan direction. Multiplier (arg2*0x108), source
step (+/-1 u16) and framebuffer offset verified vs asm. Bare GLOBAL_ASM: 38 -> 37.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
cristian
2026-07-05 16:11:29 -04:00
parent f5062afcbc
commit 19ce69a2aa
1 changed files with 52 additions and 0 deletions
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52
src/fragments/1/fragment1_7F9A0.c
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@@ -502,7 +502,59 @@ void func_81201FBC(s32 arg0, s32 arg1, s32 arg2) {
func_812018C0(arg0 + (arg2 - 8) * 2, &D_8122C748->unk_9990, arg1, 8, 0x10);
}
#ifdef NON_MATCHING
// Blit a tile's set (odd) pixels from D_8122C748's plane data into the render
// target at +0x5B4, 4 pixels per step across an 0xB x 0xC region. arg1 chooses
// the source plane and scan direction.
void func_812020C0(s32 arg0, s32 arg1, s32 arg2) {
u16* src;
u8* base;
s32 step;
s32 row;
s32 col;
u16 p;
if (arg1 != 0) {
src = (u16*) ((u8*) D_8122C748 + (arg2 * 0x108) + 0x9A90);
step = 1;
} else {
src = (u16*) ((u8*) D_8122C748 + (arg2 * 0x108) + 0x9B96);
step = -1;
}
base = (u8*) arg0;
row = 0;
do {
col = 0;
do {
u16* dst = (u16*) (base + (row * 0x280) + (col * 2) + 0x5B4);
p = *src;
src += step;
if (p & 1) {
dst[0] = p;
}
p = *src;
src += step;
if (p & 1) {
dst[1] = p;
}
p = *src;
src += step;
if (p & 1) {
dst[2] = p;
}
p = *src;
src += step;
if (p & 1) {
dst[3] = p;
}
col += 4;
} while (col != 0xC);
row += 1;
} while (row != 0xB);
}
#else
#pragma GLOBAL_ASM("asm/us/nonmatchings/fragments/1/fragment1_7F9A0/func_812020C0.s")
#endif
#pragma GLOBAL_ASM("asm/us/nonmatchings/fragments/1/fragment1_7F9A0/func_81202210.s")