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Recover saturated winding at guarded native-wide rendering branches

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This commit is contained in:
Matthew Stanley
2026-10-02 16:47:59 -07:00
parent 3787120488
commit 1ed0dfd22d
17 changed files with 200 additions and 5 deletions
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runtime/src/gte.cpp
+26
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@@ -940,6 +940,8 @@ static uint64_t s_nclip_disagreements = 0;
static int32_t s_nclip_last_native = 0;
static int8_t s_nclip_last_precise_sign = 0;
static bool s_nclip_last_precise_valid = false;
static bool s_nclip_last_horizontal_saturated = false;
static uint32_t s_nclip_last_generation;
extern "C" void gte_nclip_precise_stats(uint64_t *hits, uint64_t *fallbacks,
uint64_t *disagreements) {
if (hits) *hits = s_nclip_precise_hits;
@@ -951,6 +953,13 @@ extern "C" int gte_nclip_precise_bltz(int32_t native_mac0) {
return native_mac0 < 0;
return s_nclip_last_precise_sign < 0;
}
extern "C" int gte_nclip_native_wide_sign(int32_t native_mac0, int* sign) {
if (!s_nclip_last_precise_valid || !s_nclip_last_horizontal_saturated ||
native_mac0 != s_nclip_last_native || s_nclip_last_generation != s_geom_generation ||
s_gte_replay_sandbox || s_speculative_depth != 0) return 0;
*sign = s_nclip_last_precise_sign;
return 1;
}
void gte_nclip(GTEState* gte, uint32_t instr) {
gte->FLAG = 0;
@@ -967,6 +976,7 @@ void gte_nclip(GTEState* gte, uint32_t instr) {
int32_t out = static_cast<int32_t>(mac0);
s_nclip_last_native = out;
s_nclip_last_precise_valid = false;
s_nclip_last_horizontal_saturated = false;
/* Compute an exact 16.16 determinant for configured branch consumers, but
* preserve native guest-visible MAC0 for every architectural reader. */
int32_t px0, py0, px1, py1, px2, py2;
@@ -983,6 +993,22 @@ void gte_nclip(GTEState* gte, uint32_t instr) {
const int64_t cross = dx10 * dy20 - dy10 * dx20;
s_nclip_last_precise_sign = cross < 0 ? -1 : (cross > 0 ? 1 : 0);
s_nclip_last_precise_valid = true;
s_nclip_last_generation = s_geom_generation;
/* Narrow rescue: exact Y still agrees with the architectural FIFO,
* depth is outside the GTE near region, and at least one X exceeded
* the matching saturation rail. Ordinary subpixel winding stays stock. */
const int raw_x[3] = {sx0, sx1, sx2}, raw_y[3] = {sy0, sy1, sy2};
const int32_t exact_x[3] = {px0, px1, px2}, exact_y[3] = {py0, py1, py2};
bool checked = true, saturated = false;
for (int i = 0; i < 3; ++i) {
const int x = exact_x[i] >> 16;
checked &= (exact_y[i] >> 16) == raw_y[i] && x > -4096 && x < 4096;
checked &= gte->SZ[i + 1] >= gte->H / 2 && gte->SZ[i + 1] != 0;
if (raw_x[i] == 1023 && x > 1023) saturated = true;
else if (raw_x[i] == -1024 && x < -1024) saturated = true;
else checked &= x == raw_x[i];
}
s_nclip_last_horizontal_saturated = checked && saturated;
if ((cross > 0 && out <= 0) || (cross < 0 && out >= 0))
s_nclip_disagreements++;
} else if (gpu_ws_precise_nclip_enabled() &&