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widescreen: scope curved backdrop projection sites

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This commit is contained in:
Matthew Stanley
2026-07-10 15:51:07 -07:00
parent f1afc7fa44
commit 244474a147
5 changed files with 57 additions and 3 deletions
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runtime/src/gte.cpp
+23 -3
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@@ -243,6 +243,23 @@ extern "C" void gte_ws_set_dome_expand(int on, int aspect_num, int aspect_den) {
// dome-expand bracket (the clean alternative to the scene-dependent depth gate).
extern "C" { extern uint32_t g_debug_current_func_addr; }
static uint32_t s_gte_caller_ra = 0; /* guest ra at gte_execute = return into the GAME fn that issued the projection (not the libgte leaf) */
#define WS_DOME_CALL_SITES_MAX 32
static uint32_t s_ws_dome_call_sites[WS_DOME_CALL_SITES_MAX];
static int s_ws_dome_call_sites_n = 0;
extern "C" void gte_ws_configure_dome_sites(const uint32_t* sites, int count) {
if (count < 0) count = 0;
if (count > WS_DOME_CALL_SITES_MAX) count = WS_DOME_CALL_SITES_MAX;
s_ws_dome_call_sites_n = count;
for (int i = 0; i < count; i++)
s_ws_dome_call_sites[i] = sites[i] & 0x1FFFFFFFu;
}
static inline bool ws_dome_call_matches(void) {
// JAL writes pc+8 to RA; config records the call instruction itself.
const uint32_t call_pc = (s_gte_caller_ra - 8u) & 0x1FFFFFFFu;
for (int i = 0; i < s_ws_dome_call_sites_n; i++)
if (s_ws_dome_call_sites[i] == call_pc) return true;
return false;
}
#define DOME_PROBE_SLOTS 48
static struct { uint32_t func; uint32_t count; int32_t max_sz; } s_dome_probe[DOME_PROBE_SLOTS];
static int s_dome_probe_on = 0;
@@ -605,6 +622,11 @@ void gte_rtps_internal(GTEState* gte, int16_t* V, bool setMac0) {
// full-2D screen), so content and present stay locked.
int64_t xterm = (int64_t)gte->IR1 * h_div_sz;
bool do_squash = (s_ws_xnum != s_ws_xden) && !gpu_ws_present_native_43();
const bool dome_call = ws_dome_call_matches();
// Curved backdrops are authored to cover the original 4:3 projection.
// In classic widescreen, leave that projection intact and let the normal
// final-frame stretch cover the wide output instead of shrinking it first.
if (dome_call) do_squash = false;
if (do_squash && s_ws_suppress) {
/* Depth-gated: un-squash only FAR geometry (the backdrop); keep near
* props squashed so they stay aligned. Record SZ stats for tuning. */
@@ -616,9 +638,7 @@ void gte_rtps_internal(GTEState* gte, int16_t* V, bool setMac0) {
}
if (do_squash)
xterm = xterm * s_ws_xnum / s_ws_xden;
// Native-wide sky-dome expand: no squash active (identity), dome mode on,
// this frame is stretched, and the vertex is far (sky). Scale X outward from
// the projection centre so the finite dome mesh reaches the wider frame.
// Native-wide dome expansion remains a diagnostic-only depth probe.
else if (s_ws_dome_on && s_ws_dome_num != s_ws_dome_den &&
!gpu_ws_present_native_43()) {
int32_t sz = gte->SZ[3];