From f64ca0ce3c5d596832d975c48cf8a9f8a6333911 Mon Sep 17 00:00:00 2001
From: Codex <codex@localhost>
Date: Tue, 25 Aug 2026 01:45:55 -0700
Subject: [PATCH] config: honor title window width

---
 recompiler/src/config_loader.cpp               |  8 ++++++++
 recompiler/src/config_loader.h                 |  4 ++++
 .../tests/video_enhancement_settings_test.cpp  | 18 ++++++++++++++++++
 runtime/src/main.cpp                           |  4 ++++
 4 files changed, 34 insertions(+)

diff --git a/recompiler/src/config_loader.cpp b/recompiler/src/config_loader.cpp
index 2718a242..3eb28f7e 100644
--- a/recompiler/src/config_loader.cpp
+++ b/recompiler/src/config_loader.cpp
@@ -545,6 +545,14 @@ static RuntimeConfig parse_runtime_block(const toml::value& cfg, const fs::path&
             }
             rt.video_supersampling = static_cast<int>(n);
         }
+        if (video.contains("window_width")) {
+            const auto n = toml::find<int64_t>(video, "window_width");
+            if (n < 640 || n > 7680) {
+                throw std::runtime_error(fmt::format(
+                    "[video] window_width out of range (640..7680): {}", n));
+            }
+            rt.video_window_width = static_cast<int>(n);
+        }
         if (video.contains("antialiasing")) {
             rt.video_antialiasing = toml::find<bool>(video, "antialiasing");
         }
diff --git a/recompiler/src/config_loader.h b/recompiler/src/config_loader.h
index c6fb9f68..5bfd566d 100644
--- a/recompiler/src/config_loader.h
+++ b/recompiler/src/config_loader.h
@@ -376,6 +376,10 @@ struct RuntimeConfig {
     // supersampling + edge anti-aliasing. Cost scales ~N^2 in fill rate.
     int                   video_supersampling = 1;
 
+    // Optional initial window width declared by the title profile. Zero keeps
+    // the historical fit-to-display behavior; player settings may override it.
+    int                   video_window_width = 0;
+
     // antialiasing: when true the present path uses linear filtering when
     // scaling the framebuffer to the window (smooths the supersample
     // downscale and any window resize). false = nearest (sharp pixels).
diff --git a/recompiler/tests/video_enhancement_settings_test.cpp b/recompiler/tests/video_enhancement_settings_test.cpp
index d099a203..2be94aff 100644
--- a/recompiler/tests/video_enhancement_settings_test.cpp
+++ b/recompiler/tests/video_enhancement_settings_test.cpp
@@ -78,9 +78,12 @@ static void test_defaults_off() {
 static void test_game_toml_opt_in() {
     fs::path p = write_game_toml("psxrecomp_pgxp_on.toml",
         "[video]\n"
+        "window_width = 1920\n"
         "geometry_correction = true\n"
         "perspective_texturing = true\n");
     auto gc = PSXRecompV4::load_game_config(p);
+    check(gc.runtime.video_window_width == 1920,
+          "[video] window_width is honoured");
     check(gc.runtime.video_geometry_correction,
           "[video] geometry_correction = true is honoured");
     check(gc.runtime.video_perspective_texturing,
@@ -88,6 +91,20 @@ static void test_game_toml_opt_in() {
     fs::remove(p);
 }
 
+static void test_game_window_width_validation() {
+    fs::path p = write_game_toml("psxrecomp_window_too_small.toml",
+        "[video]\n"
+        "window_width = 639\n");
+    bool rejected = false;
+    try {
+        (void)PSXRecompV4::load_game_config(p);
+    } catch (const std::exception&) {
+        rejected = true;
+    }
+    check(rejected, "[video] window_width rejects values below 640");
+    fs::remove(p);
+}
+
 /* The two knobs are independent: a title may want stable geometry without
  * changing texture mapping (or the reverse) — so a single flag would be wrong. */
 static void test_knobs_independent() {
@@ -173,6 +190,7 @@ static void test_user_settings_round_trip() {
 int main() {
     test_defaults_off();
     test_game_toml_opt_in();
+    test_game_window_width_validation();
     test_knobs_independent();
     test_user_settings_read();
     test_user_settings_absent_key();
diff --git a/runtime/src/main.cpp b/runtime/src/main.cpp
index 872d201e..f93fa29b 100644
--- a/runtime/src/main.cpp
+++ b/runtime/src/main.cpp
@@ -10693,6 +10693,10 @@ int main(int argc, char** argv) {
             for (uint32_t site : gc.vsync_event_horizon_extra_sites)
                 psx_vsync_query_hle_add_extra_event_horizon_site(site);
             g_video_scale      = gc.runtime.video_supersampling;
+            if (gc.runtime.video_window_width > 0) {
+                g_video_win_w = gc.runtime.video_window_width;
+                g_video_win_w_explicit = true;
+            }
             g_video_aa         = gc.runtime.video_antialiasing;
             g_video_texfilter  = gc.runtime.video_texture_filter;
             g_video_fmv_filter = gc.runtime.video_fmv_filter;