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widescreen: [video] aspect_ratio — GTE X-squash + stretched present

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Adds the DuckStation-style widescreen hack as a config option,
implemented in the runtime (no regen needed):

- gte.cpp: gte_set_display_aspect(num, den). RTPS/RTPT scale the
  IR1*h/sz screen-X term by (4*den)/(3*num) around the game's own
  OFX projection centre (identity at 4:3). Games cull against the
  SXY values they read back from us, so post-projection screen-
  bounds culls stay aligned with the visible frame.
- present: GL letterbox_rect generalised to the configured aspect
  (gl_renderer_set_display_aspect); SDL_Renderer path gets an
  aspect-derived logical size + dst rect. Window opens at the
  configured aspect (clamp_window_4x3 -> clamp_window_aspect).
- config: [video] aspect_ratio = W:H (4:3 default, 16:9, up
  to 32:9) in game.toml, settings.toml (load+save), launcher seed.

World geometry keeps correct proportions on the stretched present;
screen-space 2D (HUD, FMV, sprite quad widths) stretches — the
known limitation of the squash tier. EXPERIMENTAL.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Matthew Stanley
2026-06-12 17:54:49 -07:00
parent 4ea9ecd2a2
commit f8a29e8a97
7 changed files with 160 additions and 28 deletions
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runtime/src/gte.cpp
+28 -1
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@@ -105,6 +105,31 @@ static void depth_cue_from_ir(GTEState* gte) {
gte->IR3 = gte->saturate_ir(gte->MAC3, 3, true);
}
// ---------------------------------------------------------------------------
// Widescreen X-squash (verified-enhancement, default off = identity).
//
// For a display aspect wider than the native 4:3, screen-space X is scaled by
// (4*den)/(3*num) around the projection centre OFX — e.g. 3/4 for 16:9 — and
// the present path stretches the 4:3 frame to the wide aspect, netting a wider
// horizontal field of view (the DuckStation/Beetle "widescreen hack", but
// applied in our GTE library so every RTPS/RTPT caller — generated code,
// interpreter, overlay DLLs — sees it). Only the IR1*h/sz term is scaled, NOT
// OFX, so the squash is centred on the game's own projection centre and
// games' post-projection screen-bounds culls (which read SXY back from us)
// stay aligned with the visible frame.
// ---------------------------------------------------------------------------
static int32_t s_ws_xnum = 1, s_ws_xden = 1;
extern "C" void gte_set_display_aspect(int num, int den) {
if (num <= 0 || den <= 0) { s_ws_xnum = s_ws_xden = 1; return; }
// squash = (4/3) / (num/den) = (4*den) / (3*num); identity for 4:3.
int32_t n = 4 * den, d = 3 * num;
int32_t a = n, b = d;
while (b) { int32_t t = a % b; a = b; b = t; } // gcd
s_ws_xnum = n / a;
s_ws_xden = d / a;
}
// ---------------------------------------------------------------------------
// RTPS — Perspective Transformation (internal, operates on given vertex V)
// ---------------------------------------------------------------------------
@@ -141,7 +166,9 @@ void gte_rtps_internal(GTEState* gte, int16_t* V, bool setMac0) {
int32_t h_div_sz = gte_divide(gte->H, gte->SZ[3], gte->FLAG);
// Step 4: Project to screen coordinates
int64_t sx = (gte->OFX + (int64_t)gte->IR1 * h_div_sz) >> 16;
int64_t xterm = (int64_t)gte->IR1 * h_div_sz;
if (s_ws_xnum != s_ws_xden) xterm = xterm * s_ws_xnum / s_ws_xden;
int64_t sx = (gte->OFX + xterm) >> 16;
int64_t sy = (gte->OFY + (int64_t)gte->IR2 * h_div_sz) >> 16;
gte->push_sxy(sx, sy);