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scroll texture interp wrapping

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Isaac0-dev 2025-02-24 19:43:38 +10:00
parent 935f871930
commit cf12912bf6
1 changed files with 15 additions and 5 deletions
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20
src/game/scroll_targets.c
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@ -116,23 +116,33 @@ void patch_scroll_targets_before(void) {
}
}
#define SHORT_RANGE 0x7FFF
static inline f32 wrap_f32(f32 val) {
if (val >= 0x8000) { val -= 0x10000; }
if (val <= -0x8000) { val += 0x10000; }
return val;
}
static inline s32 wrap_s32(s32 val) {
if (val >= 0x8000) { val -= 0x10000; }
if (val <= -0x8000) { val += 0x10000; }
return val;
}
void patch_scroll_targets_interpolated(f32 delta) {
f32 antiDelta = 1.0f - delta;
for (struct ScrollTarget* scroll = hmap_begin(sScrollTargets); scroll != NULL; scroll = hmap_next(sScrollTargets)) {
if (scroll->needInterp) {
Vtx* *verts = scroll->vertices;
if (scroll->bhv < SCROLL_UV_X) {
u8 bhvIndex = MIN(scroll->bhv, 2);
for (u16 k = 0; k < scroll->size; k++) {
verts[k]->n.ob[bhvIndex] = scroll->prevF32[k] * antiDelta + scroll->interpF32[k] * delta;
f32 diff = wrap_f32(scroll->interpF32[k] - scroll->prevF32[k]);
verts[k]->n.ob[bhvIndex] = wrap_f32(scroll->prevF32[k] + diff * delta);
}
} else {
u8 bhvIndex = MIN(scroll->bhv-SCROLL_UV_X, 1);
for (u16 k = 0; k < scroll->size; k++) {
verts[k]->n.tc[bhvIndex] = clampf(scroll->prevS16[k] * antiDelta + scroll->interpS16[k] * delta, -SHORT_RANGE, SHORT_RANGE);
s32 diff = wrap_s32(scroll->interpS16[k] - scroll->prevS16[k]);
verts[k]->n.tc[bhvIndex] = wrap_s32(scroll->prevS16[k] + diff * delta);
}
}
}