GPU/HW: Add quad line detection (Wild Arms 2)

data/resources/gamedb.yaml

@@ -43128,8 +43128,9 @@ SLES-00132:
   controllers:
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "GT Interactive / Williams Entertainment"
     developer: "Midway Studios San Diego"
@@ -43151,8 +43152,9 @@ SLPS-00308:
   controllers:
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "Soft Bank"
     developer: "Midway Studios San Diego"
@@ -43172,12 +43174,12 @@ SLUS-00077:
   compatibility:
     rating: NoIssues
     versionTested: "0.1-908-g9f22684"
-    upscalingIssues: "Broken when upscaling"
   controllers:
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "GT Interactive / Williams Entertainment"
     developer: "Midway Studios San Diego"
@@ -46145,8 +46147,9 @@ SLES-00703:
     - AnalogController
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "GT Interactive"
     developer: "3D Realms Entertainment"
@@ -46167,8 +46170,9 @@ SLES-00987:
     - AnalogController
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "GT Interactive"
     developer: "3D Realms Entertainment"
@@ -46186,8 +46190,9 @@ SLES-00987:
 SLED-01027:
   name: "Duke Nukem (France) (Demo)"
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
 SLES-03405:
   name: "Duke Nukem - Land of the Babes (Europe) (En,Fr,De,Es,It)"
   controllers:
@@ -46360,8 +46365,9 @@ SLPS-01557:
     - AnalogController
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "King Record Co. Ltd"
     developer: "3D Realms Entertainment"
@@ -46385,8 +46391,9 @@ SLUS-00355:
     - AnalogController
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "GT Interactive"
     developer: "3D Realms Entertainment"
@@ -54792,8 +54799,9 @@ SLES-00487:
     - DigitalController
     - PlayStationMouse
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "GT Interactive / Williams Entertainment"
     developer: "id Software, Inc."
@@ -54814,8 +54822,9 @@ SLPS-00727:
     - DigitalController
     - PlayStationMouse
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "Soft Bank"
     developer: "id Software, Inc."
@@ -54835,13 +54844,13 @@ SLUS-00331:
   compatibility:
     rating: NoIssues
     versionTested: "0.1-986-gfc911de1"
-    upscalingIssues: "Rendering is broken with any upscaling."
   controllers:
     - DigitalController
     - PlayStationMouse
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "GT Interactive / Williams Entertainment"
     developer: "id Software, Inc."
@@ -149474,6 +149483,8 @@ SCES-00577:
     versionTested: "0.1-2949-gcd2c581f"
   controllers:
     - DigitalController
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled water rendering.
   metadata:
     publisher: "Sony Computer Entertaiment Europe"
     developer: "Namco"
@@ -149493,9 +149504,10 @@ SLUS-00240:
   compatibility:
     rating: NoIssues
     versionTested: "0.1-1409-ge198e315"
-    upscalingIssues: "Water error in Li Long stage (Issue #371)"
   controllers:
     - DigitalController
+  settings:
+    gpuLineDetectMode: BasicTriangles # Fixes upscaled water rendering.
   metadata:
     publisher: "Namco"
     developer: "Namco"
@@ -153089,8 +153101,9 @@ SLES-00585:
   controllers:
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, PGXP is not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: AggressiveTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "Lucasarts"
     developer: "Lucasarts / Big Bang Software, Inc"
@@ -153110,8 +153123,9 @@ SLES-00640:
   controllers:
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, PGXP is not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: AggressiveTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "Lucasarts"
     developer: "Lucasarts / Big Bang Software, Inc"
@@ -153132,8 +153146,9 @@ SLPS-00685:
   controllers:
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, PGXP is not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: AggressiveTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "Bullet-Proof Software"
     developer: "Lucasarts / Big Bang Software, Inc"
@@ -153153,8 +153168,9 @@ SLES-00646:
   controllers:
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, PGXP is not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: AggressiveTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "Erbe Software"
     developer: "Lucasarts / Big Bang Software, Inc"
@@ -153175,12 +153191,12 @@ SLUS-00297:
   compatibility:
     rating: NoIssues
     versionTested: "0.1-986-gfc911de1"
-    upscalingIssues: "Rendering is broken when upscaling is used."
   controllers:
     - DigitalController
   traits:
-    - DisableUpscaling
+    - DisablePGXP # 2.5D, PGXP is not beneficial.
-    - DisablePGXP
+  settings:
+    gpuLineDetectMode: AggressiveTriangles # Fixes upscaled rendering.
   metadata:
     publisher: "Lucasarts"
     developer: "Lucasarts / Big Bang Software, Inc"
@@ -163808,6 +163824,8 @@ SLPS-00365:
   name: "Tekkyuu - True Pinball (Japan)"
   controllers:
     - DigitalController
+  traits:
+    - DisableUpscaling
   metadata:
     publisher: "Ocean"
     developer: "Digital Illusions CE AB"
@@ -172671,6 +172689,8 @@ SLES-00052:
   name: "True Pinball (Europe)"
   controllers:
     - DigitalController
+  traits:
+    - DisableUpscaling
   metadata:
     publisher: "Ocean"
     developer: "Digital Illusions CE AB"
@@ -172695,6 +172715,7 @@ SLUS-00337:
     - DigitalController
   traits:
     - ForceInterlacing
+    - DisableUpscaling
   metadata:
     publisher: "Ocean"
     developer: "Digital Illusions CE AB"
@@ -180948,6 +180969,8 @@ SCUS-94592:
   name: "Wild Arms 2 (USA) (Demo)"
   traits:
     - ForcePGXPCPUMode
+  settings:
+    gpuLineDetectMode: Quads
 SCUS-94484:
   name: "Wild Arms 2 (USA) (Disc 1)"
   discSet:
@@ -180962,6 +180985,8 @@ SCUS-94484:
     - DigitalController
   traits:
     - ForcePGXPCPUMode
+  settings:
+    gpuLineDetectMode: Quads
   metadata:
     publisher: "Sony"
     developer: "Media.Vision Entertainment / Contrail"
@@ -180987,6 +181012,8 @@ SCUS-94498:
     - DigitalController
   traits:
     - ForcePGXPCPUMode
+  settings:
+    gpuLineDetectMode: Quads
   metadata:
     publisher: "Sony"
     developer: "Media.Vision Entertainment / Contrail"
@@ -181007,6 +181034,8 @@ SCPS-45429:
     - DigitalController
   traits:
     - ForcePGXPCPUMode
+  settings:
+    gpuLineDetectMode: Quads
   codes:
     - SCPS-45429
     - SCPS-45430

src/core/fullscreen_ui.cpp

@@ -2467,13 +2467,12 @@ void FullscreenUI::DrawSettingsWindow()
     static constexpr float ITEM_WIDTH = 25.0f;
 
     static constexpr const char* global_icons[] = {
-      ICON_FA_TV, ICON_FA_DICE_D20,          ICON_FA_COGS,  ICON_PF_MICROCHIP,
+      ICON_FA_TV,           ICON_FA_DICE_D20,    ICON_FA_COGS,   ICON_PF_MICROCHIP,
-      ICON_PF_PICTURE,           ICON_FA_MAGIC, ICON_PF_SOUND, ICON_PF_GAMEPAD_ALT,
+      ICON_PF_PICTURE,      ICON_FA_MAGIC,       ICON_PF_SOUND,  ICON_PF_GAMEPAD_ALT,
-      ICON_PF_KEYBOARD_ALT,        ICON_PF_MEMORY_CARD,      ICON_FA_TROPHY,     ICON_FA_EXCLAMATION_TRIANGLE};
+      ICON_PF_KEYBOARD_ALT, ICON_PF_MEMORY_CARD, ICON_FA_TROPHY, ICON_FA_EXCLAMATION_TRIANGLE};
-    static constexpr const char* per_game_icons[] = {
+    static constexpr const char* per_game_icons[] = {ICON_FA_PARAGRAPH,   ICON_FA_HDD,    ICON_FA_COGS,
-      ICON_FA_PARAGRAPH, ICON_FA_HDD,        ICON_FA_COGS,
+                                                     ICON_PF_PICTURE,     ICON_PF_SOUND,  ICON_PF_GAMEPAD_ALT,
-      ICON_PF_PICTURE,     ICON_PF_SOUND, ICON_PF_GAMEPAD_ALT,
+                                                     ICON_PF_MEMORY_CARD, ICON_FA_TROPHY, ICON_FA_EXCLAMATION_TRIANGLE};
-      ICON_PF_MEMORY_CARD,   ICON_FA_TROPHY,     ICON_FA_EXCLAMATION_TRIANGLE};
     static constexpr SettingsPage global_pages[] = {
       SettingsPage::Interface, SettingsPage::Console,        SettingsPage::Emulation,    SettingsPage::BIOS,
       SettingsPage::Display,   SettingsPage::PostProcessing, SettingsPage::Audio,        SettingsPage::Controller,
@@ -3908,6 +3907,13 @@ void FullscreenUI::DrawDisplaySettingsPage()
     "GPU", "TextureFilter", Settings::DEFAULT_GPU_TEXTURE_FILTER, &Settings::ParseTextureFilterName,
     &Settings::GetTextureFilterName, &Settings::GetTextureFilterDisplayName, GPUTextureFilter::Count, is_hardware);
 
+  DrawEnumSetting(bsi, FSUI_CSTR("Line Detection"),
+                  FSUI_CSTR("Attempts to detect one pixel high/wide lines that rely on non-upscaled rasterization "
+                            "behavior, filling in gaps introduced by upscaling."),
+                  "GPU", "LineDetectMode", Settings::DEFAULT_GPU_LINE_DETECT_MODE, &Settings::ParseLineDetectModeName,
+                  &Settings::GetLineDetectModeName, &Settings::GetLineDetectModeDisplayName, GPULineDetectMode::Count,
+                  is_hardware);
+
   DrawToggleSetting(bsi, FSUI_CSTR("True Color Rendering"),
                     FSUI_CSTR("Disables dithering and uses the full 8 bits per channel of color information."), "GPU",
                     "TrueColor", true, is_hardware);
@@ -6547,6 +6553,7 @@ TRANSLATE_NOOP("FullscreenUI", "Apply Image Patches");
 TRANSLATE_NOOP("FullscreenUI", "Apply Per-Game Settings");
 TRANSLATE_NOOP("FullscreenUI", "Are you sure you want to clear the current post-processing chain? All configuration will be lost.");
 TRANSLATE_NOOP("FullscreenUI", "Aspect Ratio");
+TRANSLATE_NOOP("FullscreenUI", "Attempts to detect one pixel high/wide lines that rely on non-upscaled rasterization behavior, filling in gaps introduced by upscaling.");
 TRANSLATE_NOOP("FullscreenUI", "Attempts to map the selected port to a chosen controller.");
 TRANSLATE_NOOP("FullscreenUI", "Audio Backend");
 TRANSLATE_NOOP("FullscreenUI", "Audio Control");
@@ -6777,6 +6784,7 @@ TRANSLATE_NOOP("FullscreenUI", "Leaderboard Notifications");
 TRANSLATE_NOOP("FullscreenUI", "Leaderboards");
 TRANSLATE_NOOP("FullscreenUI", "Leaderboards are not enabled.");
 TRANSLATE_NOOP("FullscreenUI", "Limits how many frames are displayed to the screen. These frames are still rendered.");
+TRANSLATE_NOOP("FullscreenUI", "Line Detection");
 TRANSLATE_NOOP("FullscreenUI", "List Settings");
 TRANSLATE_NOOP("FullscreenUI", "Load Devices From Save States");
 TRANSLATE_NOOP("FullscreenUI", "Load Profile");

src/core/game_database.cpp

@@ -33,7 +33,7 @@ namespace GameDatabase {
 enum : u32
 {
   GAME_DATABASE_CACHE_SIGNATURE = 0x45434C48,
-  GAME_DATABASE_CACHE_VERSION = 6,
+  GAME_DATABASE_CACHE_VERSION = 7,
 };
 
 static Entry* GetMutableEntry(const std::string_view& serial);
@@ -184,6 +184,31 @@ static std::optional<T> GetOptionalTFromObject(const ryml::ConstNodeRef& object,
   return ret;
 }
 
+template<typename T>
+static std::optional<T> ParseOptionalTFromObject(const ryml::ConstNodeRef& object, std::string_view key,
+                                                 std::optional<T> (*from_string_function)(const char* str))
+{
+  std::optional<T> ret;
+
+  const ryml::ConstNodeRef member = object.find_child(to_csubstr(key));
+  if (member.valid())
+  {
+    const c4::csubstr val = member.val();
+    if (!val.empty())
+    {
+      ret = from_string_function(TinyString(to_stringview(val)));
+      if (!ret.has_value())
+        Log_ErrorFmt("Unknown value for {}: {}", key, to_stringview(val));
+    }
+    else
+    {
+      Log_ErrorFmt("Unexpected empty value in {}", key);
+    }
+  }
+
+  return ret;
+}
+
 void GameDatabase::EnsureLoaded()
 {
   if (s_loaded)
@@ -335,6 +360,8 @@ void GameDatabase::Entry::ApplySettings(Settings& settings, bool display_osd_mes
     settings.gpu_pgxp_tolerance = gpu_pgxp_tolerance.value();
   if (gpu_pgxp_depth_threshold.has_value())
     settings.SetPGXPDepthClearThreshold(gpu_pgxp_depth_threshold.value());
+  if (gpu_line_detect_mode.has_value())
+    settings.gpu_line_detect_mode = gpu_line_detect_mode.value();
 
   if (HasTrait(Trait::ForceInterpreter))
   {
@@ -713,6 +740,7 @@ bool GameDatabase::LoadFromCache()
         !ReadOptionalFromStream(stream.get(), &entry.gpu_max_run_ahead) ||
         !ReadOptionalFromStream(stream.get(), &entry.gpu_pgxp_tolerance) ||
         !ReadOptionalFromStream(stream.get(), &entry.gpu_pgxp_depth_threshold) ||
+        !ReadOptionalFromStream(stream.get(), &entry.gpu_line_detect_mode) ||
         !stream->ReadSizePrefixedString(&entry.disc_set_name) || !stream->ReadU32(&num_disc_set_serials))
     {
       Log_DevPrintf("Cache entry is corrupted.");
@@ -811,6 +839,7 @@ bool GameDatabase::SaveToCache()
     result = result && WriteOptionalToStream(stream.get(), entry.gpu_max_run_ahead);
     result = result && WriteOptionalToStream(stream.get(), entry.gpu_pgxp_tolerance);
     result = result && WriteOptionalToStream(stream.get(), entry.gpu_pgxp_depth_threshold);
+    result = result && WriteOptionalToStream(stream.get(), entry.gpu_line_detect_mode);
 
     result = result && stream->WriteSizePrefixedString(entry.disc_set_name);
     result = result && stream->WriteU32(static_cast<u32>(entry.disc_set_serials.size()));
@@ -1019,6 +1048,8 @@ bool GameDatabase::ParseYamlEntry(Entry* entry, const ryml::ConstNodeRef& value)
     entry->gpu_max_run_ahead = GetOptionalTFromObject<u32>(settings, "gpuMaxRunAhead");
     entry->gpu_pgxp_tolerance = GetOptionalTFromObject<float>(settings, "gpuPGXPTolerance");
     entry->gpu_pgxp_depth_threshold = GetOptionalTFromObject<float>(settings, "gpuPGXPDepthThreshold");
+    entry->gpu_line_detect_mode =
+      ParseOptionalTFromObject<GPULineDetectMode>(settings, "gpuLineDetectMode", &Settings::ParseLineDetectModeName);
   }
 
   if (const ryml::ConstNodeRef disc_set = value.find_child("discSet"); disc_set.valid() && disc_set.has_children())

src/core/game_database.h

@@ -80,6 +80,7 @@ struct Entry
   std::optional<u32> gpu_max_run_ahead;
   std::optional<float> gpu_pgxp_tolerance;
   std::optional<float> gpu_pgxp_depth_threshold;
+  std::optional<GPULineDetectMode> gpu_line_detect_mode;
 
   std::string disc_set_name;
   std::vector<std::string> disc_set_serials;

src/core/gpu_hw.cpp

@@ -200,6 +200,7 @@ bool GPU_HW::Initialize()
   m_debanding = g_settings.gpu_debanding;
   m_scaled_dithering = g_settings.gpu_scaled_dithering;
   m_texture_filtering = g_settings.gpu_texture_filter;
+  m_line_detect_mode = (m_resolution_scale > 1) ? g_settings.gpu_line_detect_mode : GPULineDetectMode::Disabled;
   m_clamp_uvs = ShouldClampUVs();
   m_compute_uv_range = m_clamp_uvs;
   m_chroma_smoothing = g_settings.gpu_24bit_chroma_smoothing;
@@ -386,6 +387,7 @@ void GPU_HW::UpdateSettings(const Settings& old_settings)
   m_debanding = g_settings.gpu_debanding;
   m_scaled_dithering = g_settings.gpu_scaled_dithering;
   m_texture_filtering = g_settings.gpu_texture_filter;
+  m_line_detect_mode = (m_resolution_scale > 1) ? g_settings.gpu_line_detect_mode : GPULineDetectMode::Disabled;
   m_clamp_uvs = clamp_uvs;
   m_compute_uv_range = m_clamp_uvs;
   m_chroma_smoothing = g_settings.gpu_24bit_chroma_smoothing;
@@ -1410,7 +1412,7 @@ void GPU_HW::ClearDisplay()
     g_gpu_device->ClearRenderTarget(m_display_private_texture.get(), 0xFF000000u);
 }
 
-void GPU_HW::HandleFlippedQuadTextureCoordinates(BatchVertex* vertices)
+ALWAYS_INLINE_RELEASE void GPU_HW::HandleFlippedQuadTextureCoordinates(BatchVertex* vertices)
 {
   // Taken from beetle-psx gpu_polygon.cpp
   // For X/Y flipped 2D sprites, PSX games rely on a very specific rasterization behavior. If U or V is decreasing in X
@@ -1433,6 +1435,24 @@ void GPU_HW::HandleFlippedQuadTextureCoordinates(BatchVertex* vertices)
   const float cax = vertices[0].x - vertices[2].x;
   const float cay = vertices[0].y - vertices[2].y;
 
+  // Hack for Wild Arms 2: The player sprite is drawn one line at a time with a quad, but the bottom V coordinates
+  // are set to a large distance from the top V coordinate. When upscaling, this means that the coordinate is
+  // interpolated between these two values, result in out-of-bounds sampling. At native, it's fine, because at the
+  // top of the primitive, no amount is added to the coordinates. So, in this case, just set all coordinates to the
+  // same value, from the first vertex, ensuring no interpolation occurs. Gate it based on the Y distance being one
+  // pixel, limiting the risk of false positives.
+  if (m_line_detect_mode == GPULineDetectMode::Quads &&
+      (std::max(vertices[0].y, std::max(vertices[1].y, std::max(vertices[2].y, vertices[3].y))) -
+       std::min(vertices[0].y, std::min(vertices[1].y, std::min(vertices[2].y, vertices[3].y)))) == 1.0f) [[unlikely]]
+  {
+    GL_INS_FMT("HLineQuad detected at [{},{}={},{} {},{}={},{} {},{}={},{} {},{}={},{}", vertices[0].x, vertices[0].y,
+               vertices[0].u, vertices[0].v, vertices[1].x, vertices[1].y, vertices[1].u, vertices[1].v, vertices[2].x,
+               vertices[2].y, vertices[2].u, vertices[2].v, vertices[3].x, vertices[3].y, vertices[3].u, vertices[3].v);
+    vertices[1].v = vertices[0].v;
+    vertices[2].v = vertices[0].v;
+    vertices[3].v = vertices[0].v;
+  }
+
   // Compute static derivatives, just assume W is uniform across the primitive and that the plane equation remains the
   // same across the quad. (which it is, there is no Z.. yet).
   const float dudx = -aby * static_cast<float>(vertices[2].u) - bcy * static_cast<float>(vertices[0].u) -
@@ -1449,11 +1469,8 @@ void GPU_HW::HandleFlippedQuadTextureCoordinates(BatchVertex* vertices)
   const s32 texArea = (vertices[1].u - vertices[0].u) * (vertices[2].v - vertices[0].v) -
                       (vertices[2].u - vertices[0].u) * (vertices[1].v - vertices[0].v);
 
-  // Leverage PGXP to further avoid 3D polygons that just happen to align this way after projection
-  const bool is_3d = (vertices[0].w != vertices[1].w || vertices[0].w != vertices[2].w);
-
   // Shouldn't matter as degenerate primitives will be culled anyways.
-  if (area == 0.0f || texArea == 0 || is_3d)
+  if (area == 0.0f || texArea == 0)
     return;
 
   // Use floats here as it'll be faster than integer divides.
@@ -1500,6 +1517,156 @@ void GPU_HW::HandleFlippedQuadTextureCoordinates(BatchVertex* vertices)
   }
 }
 
+ALWAYS_INLINE_RELEASE void GPU_HW::ExpandLineTriangles(BatchVertex* vertices, u32 base_vertex)
+{
+  // Line expansion inspired by beetle-psx.
+  BatchVertex *vshort, *vlong;
+  bool vertical, horizontal;
+
+  if (m_line_detect_mode == GPULineDetectMode::BasicTriangles)
+  {
+    // Given a tall/one-pixel-wide triangle, determine which vertex is the corner with axis-aligned edges.
+    BatchVertex* vcorner;
+    if (vertices[0].u == vertices[1].u && vertices[0].v == vertices[1].v)
+    {
+      // A,B,C
+      vcorner = &vertices[0];
+      vshort = &vertices[1];
+      vlong = &vertices[2];
+    }
+    else if (vertices[1].u == vertices[2].u && vertices[1].v == vertices[2].v)
+    {
+      // B,C,A
+      vcorner = &vertices[1];
+      vshort = &vertices[2];
+      vlong = &vertices[0];
+    }
+    else if (vertices[2].u == vertices[0].u && vertices[2].v == vertices[0].v)
+    {
+      // C,A,B
+      vcorner = &vertices[2];
+      vshort = &vertices[0];
+      vlong = &vertices[1];
+    }
+    else
+    {
+      return;
+    }
+
+    // Determine line direction. Vertical lines will have a width of 1, horizontal lines a height of 1.
+    vertical = ((vcorner->y == vshort->y) && (std::abs(vcorner->x - vshort->x) == 1.0f));
+    horizontal = ((vcorner->x == vshort->x) && (std::abs(vcorner->y - vshort->y) == 1.0f));
+    if (vertical)
+    {
+      // Line should be vertical. Make sure the triangle is actually a right angle.
+      if (vshort->x == vlong->x)
+        std::swap(vshort, vcorner);
+      else if (vcorner->x != vlong->x)
+        return;
+
+      GL_INS_FMT("Vertical line from Y={} to {}", vcorner->y, vlong->y);
+    }
+    else if (horizontal)
+    {
+      // Line should be horizontal. Make sure the triangle is actually a right angle.
+      if (vshort->y == vlong->y)
+        std::swap(vshort, vcorner);
+      else if (vcorner->y != vlong->y)
+        return;
+
+      GL_INS_FMT("Horizontal line from X={} to {}", vcorner->x, vlong->x);
+    }
+    else
+    {
+      // Not a line-like triangle.
+      return;
+    }
+
+    // We could adjust the short texture coordinate to +1 from its original position, rather than leaving it the same.
+    // However, since the texture is unlikely to be a higher resolution than the one-wide triangle, there would be no
+    // benefit in doing so.
+  }
+  else
+  {
+    DebugAssert(m_line_detect_mode == GPULineDetectMode::AggressiveTriangles);
+
+    // Find direction of line based on horizontal position.
+    BatchVertex *va, *vb, *vc;
+    if (vertices[0].x == vertices[1].x)
+    {
+      va = &vertices[0];
+      vb = &vertices[1];
+      vc = &vertices[2];
+    }
+    else if (vertices[1].x == vertices[2].x)
+    {
+      va = &vertices[1];
+      vb = &vertices[2];
+      vc = &vertices[0];
+    }
+    else if (vertices[2].x == vertices[0].x)
+    {
+      va = &vertices[2];
+      vb = &vertices[0];
+      vc = &vertices[1];
+    }
+    else
+    {
+      return;
+    }
+
+    // Determine line direction. Vertical lines will have a width of 1, horizontal lines a height of 1.
+    vertical = (std::abs(va->x - vc->x) == 1.0f);
+    horizontal = (std::abs(va->y - vb->y) == 1.0f);
+    if (!vertical && !horizontal)
+      return;
+
+    // Determine which vertex is the right angle, based on the vertical position.
+    const BatchVertex* vcorner;
+    if (va->y == vc->y)
+      vcorner = va;
+    else if (vb->y == vc->y)
+      vcorner = vb;
+    else
+      return;
+
+    // Find short/long edge of the triangle.
+    BatchVertex* vother = ((vcorner == va) ? vb : va);
+    vshort = horizontal ? vother : vc;
+    vlong = vertical ? vother : vc;
+
+    // Dark Forces draws its gun sprite vertically, but rotated compared to the sprite date in VRAM.
+    // Therefore the difference in V should be ignored.
+    vshort->u = vcorner->u;
+    vshort->v = vcorner->v;
+
+    // We need to re-compute the UV limits, since we adjusted them above.
+    if (m_compute_uv_range)
+      ComputePolygonUVLimits(vertices[0].texpage, vertices, 3);
+
+    // This is super jank, but because we rewrote the UVs on one of the vertices above, we need to rewrite it to GPU
+    // memory again. Has to be all of them as well, not just vshort, because the UV limits may have changed.
+    DebugAssert(m_batch_vertex_count >= 3);
+    std::memcpy(m_batch_vertex_ptr - 3, vertices, sizeof(BatchVertex) * 3);
+  }
+
+  // Need to write the 4th vertex to the GPU.
+  DebugAssert(m_batch_vertex_space >= 1);
+  BatchVertex* last = &(*(m_batch_vertex_ptr++) = *vlong);
+  last->x = vertical ? vshort->x : vlong->x;
+  last->y = horizontal ? vshort->y : vlong->y;
+  m_batch_vertex_count++;
+  m_batch_vertex_space--;
+
+  // Generate indices for second triangle.
+  DebugAssert(m_batch_index_space >= 3);
+  *(m_batch_index_ptr++) = Truncate16(base_vertex + (vshort - vertices));
+  *(m_batch_index_ptr++) = Truncate16(base_vertex + (vlong - vertices));
+  *(m_batch_index_ptr++) = Truncate16(base_vertex + 3);
+  m_batch_index_count += 3;
+  m_batch_index_space -= 3;
+}
+
 void GPU_HW::ComputePolygonUVLimits(u32 texpage, BatchVertex* vertices, u32 num_vertices)
 {
   u32 min_u = vertices[0].u, max_u = vertices[0].u, min_v = vertices[0].v, max_v = vertices[0].v;
@@ -1727,7 +1894,9 @@ void GPU_HW::LoadVertices()
         }
       }
 
-      if (rc.quad_polygon && m_resolution_scale > 1)
+      // Use PGXP to exclude primitives that are definitely 3D.
+      const bool is_3d = (vertices[0].w != vertices[1].w || vertices[0].w != vertices[2].w);
+      if (m_resolution_scale > 1 && !is_3d && rc.quad_polygon)
         HandleFlippedQuadTextureCoordinates(vertices.data());
 
       if (m_compute_uv_range && textured)
@@ -1761,8 +1930,9 @@ void GPU_HW::LoadVertices()
       const s32 max_x = std::max(max_x_12, native_vertex_positions[0][0]);
       const s32 min_y = std::min(min_y_12, native_vertex_positions[0][1]);
       const s32 max_y = std::max(max_y_12, native_vertex_positions[0][1]);
+      const bool first_tri_culled = ((max_x - min_x) >= MAX_PRIMITIVE_WIDTH || (max_y - min_y) >= MAX_PRIMITIVE_HEIGHT);
 
-      if ((max_x - min_x) >= MAX_PRIMITIVE_WIDTH || (max_y - min_y) >= MAX_PRIMITIVE_HEIGHT)
+      if (first_tri_culled)
       {
         Log_DebugFmt("Culling too-large polygon: {},{} {},{} {},{}", native_vertex_positions[0][0],
                      native_vertex_positions[0][1], native_vertex_positions[1][0], native_vertex_positions[1][1],
@@ -1828,6 +1998,12 @@ void GPU_HW::LoadVertices()
           m_batch_index_space -= 3;
         }
       }
+      else
+      {
+        // Expand lines to triangles (Doom, Soul Blade, etc.)
+        if (m_line_detect_mode >= GPULineDetectMode::BasicTriangles && !is_3d && !first_tri_culled)
+          ExpandLineTriangles(vertices.data(), start_index);
+      }
 
       if (m_sw_renderer)
       {

src/core/gpu_hw.h

@@ -189,7 +189,8 @@ private:
   void DrawLine(float x0, float y0, u32 col0, float x1, float y1, u32 col1, float depth);
 
   /// Handles quads with flipped texture coordinate directions.
-  static void HandleFlippedQuadTextureCoordinates(BatchVertex* vertices);
+  void HandleFlippedQuadTextureCoordinates(BatchVertex* vertices);
+  void ExpandLineTriangles(BatchVertex* vertices, u32 base_vertex);
 
   /// Computes polygon U/V boundaries.
   void ComputePolygonUVLimits(u32 texpage, BatchVertex* vertices, u32 num_vertices);
@@ -240,6 +241,7 @@ private:
   bool m_disable_color_perspective : 1 = false;
 
   GPUTextureFilter m_texture_filtering = GPUTextureFilter::Nearest;
+  GPULineDetectMode m_line_detect_mode = GPULineDetectMode::Disabled;
   GPUDownsampleMode m_downsample_mode = GPUDownsampleMode::Disabled;
   GPUWireframeMode m_wireframe_mode = GPUWireframeMode::Disabled;
   bool m_true_color : 1 = true;

src/core/settings.cpp

@@ -196,6 +196,10 @@ void Settings::Load(SettingsInterface& si)
     ParseTextureFilterName(
       si.GetStringValue("GPU", "TextureFilter", GetTextureFilterName(DEFAULT_GPU_TEXTURE_FILTER)).c_str())
       .value_or(DEFAULT_GPU_TEXTURE_FILTER);
+  gpu_line_detect_mode =
+    ParseLineDetectModeName(
+      si.GetStringValue("GPU", "LineDetectMode", GetLineDetectModeName(DEFAULT_GPU_LINE_DETECT_MODE)).c_str())
+      .value_or(DEFAULT_GPU_LINE_DETECT_MODE);
   gpu_downsample_mode =
     ParseDownsampleModeName(
       si.GetStringValue("GPU", "DownsampleMode", GetDownsampleModeName(DEFAULT_GPU_DOWNSAMPLE_MODE)).c_str())
@@ -461,6 +465,7 @@ void Settings::Save(SettingsInterface& si) const
   si.SetBoolValue("GPU", "Debanding", gpu_debanding);
   si.SetBoolValue("GPU", "ScaledDithering", gpu_scaled_dithering);
   si.SetStringValue("GPU", "TextureFilter", GetTextureFilterName(gpu_texture_filter));
+  si.SetStringValue("GPU", "LineDetectMode", GetLineDetectModeName(gpu_line_detect_mode));
   si.SetStringValue("GPU", "DownsampleMode", GetDownsampleModeName(gpu_downsample_mode));
   si.SetUIntValue("GPU", "DownsampleScale", gpu_downsample_scale);
   si.SetStringValue("GPU", "WireframeMode", GetGPUWireframeModeName(gpu_wireframe_mode));
@@ -621,6 +626,7 @@ void Settings::FixIncompatibleSettings(bool display_osd_messages)
     g_settings.gpu_debanding = false;
     g_settings.gpu_scaled_dithering = false;
     g_settings.gpu_texture_filter = GPUTextureFilter::Nearest;
+    g_settings.gpu_line_detect_mode = GPULineDetectMode::Disabled;
     g_settings.gpu_disable_interlacing = false;
     g_settings.gpu_force_ntsc_timings = false;
     g_settings.gpu_widescreen_hack = false;
@@ -1005,8 +1011,9 @@ RenderAPI Settings::GetRenderAPIForRenderer(GPURenderer renderer)
   }
 }
 
-static constexpr const std::array s_texture_filter_names = {"Nearest",       "Bilinear", "BilinearBinAlpha", "JINC2",
+static constexpr const std::array s_texture_filter_names = {
-                                                            "JINC2BinAlpha", "xBR",      "xBRBinAlpha"};
+  "Nearest", "Bilinear", "BilinearBinAlpha", "JINC2", "JINC2BinAlpha", "xBR", "xBRBinAlpha",
+};
 static constexpr const std::array s_texture_filter_display_names = {
   TRANSLATE_NOOP("GPUTextureFilter", "Nearest-Neighbor"),
   TRANSLATE_NOOP("GPUTextureFilter", "Bilinear"),
@@ -1014,7 +1021,8 @@ static constexpr const std::array s_texture_filter_display_names = {
   TRANSLATE_NOOP("GPUTextureFilter", "JINC2 (Slow)"),
   TRANSLATE_NOOP("GPUTextureFilter", "JINC2 (Slow, No Edge Blending)"),
   TRANSLATE_NOOP("GPUTextureFilter", "xBR (Very Slow)"),
-  TRANSLATE_NOOP("GPUTextureFilter", "xBR (Very Slow, No Edge Blending)")};
+  TRANSLATE_NOOP("GPUTextureFilter", "xBR (Very Slow, No Edge Blending)"),
+};
 
 std::optional<GPUTextureFilter> Settings::ParseTextureFilterName(const char* str)
 {
@@ -1032,7 +1040,7 @@ std::optional<GPUTextureFilter> Settings::ParseTextureFilterName(const char* str
 
 const char* Settings::GetTextureFilterName(GPUTextureFilter filter)
 {
-  return s_texture_filter_names[static_cast<int>(filter)];
+  return s_texture_filter_names[static_cast<size_t>(filter)];
 }
 
 const char* Settings::GetTextureFilterDisplayName(GPUTextureFilter filter)
@@ -1040,6 +1048,43 @@ const char* Settings::GetTextureFilterDisplayName(GPUTextureFilter filter)
   return Host::TranslateToCString("GPUTextureFilter", s_texture_filter_display_names[static_cast<int>(filter)]);
 }
 
+static constexpr const std::array s_line_detect_mode_names = {
+  "Disabled",
+  "Quads",
+  "BasicTriangles",
+  "AggressiveTriangles",
+};
+static constexpr const std::array s_line_detect_mode_detect_names = {
+  TRANSLATE_NOOP("GPULineDetectMode", "Disabled"),
+  TRANSLATE_NOOP("GPULineDetectMode", "Quads"),
+  TRANSLATE_NOOP("GPULineDetectMode", "Triangles (Basic)"),
+  TRANSLATE_NOOP("GPULineDetectMode", "Triangles (Aggressive)"),
+};
+
+std::optional<GPULineDetectMode> Settings::ParseLineDetectModeName(const char* str)
+{
+  int index = 0;
+  for (const char* name : s_line_detect_mode_names)
+  {
+    if (StringUtil::Strcasecmp(name, str) == 0)
+      return static_cast<GPULineDetectMode>(index);
+
+    index++;
+  }
+
+  return std::nullopt;
+}
+
+const char* Settings::GetLineDetectModeName(GPULineDetectMode mode)
+{
+  return s_line_detect_mode_names[static_cast<size_t>(mode)];
+}
+
+const char* Settings::GetLineDetectModeDisplayName(GPULineDetectMode mode)
+{
+  return Host::TranslateToCString("GPULineDetectMode", s_line_detect_mode_detect_names[static_cast<size_t>(mode)]);
+}
+
 static constexpr const std::array s_downsample_mode_names = {"Disabled", "Box", "Adaptive"};
 static constexpr const std::array s_downsample_mode_display_names = {
   TRANSLATE_NOOP("GPUDownsampleMode", "Disabled"),

src/core/settings.h

@@ -115,6 +115,7 @@ struct Settings
   bool gpu_debanding : 1 = false;
   bool gpu_scaled_dithering : 1 = true;
   GPUTextureFilter gpu_texture_filter = DEFAULT_GPU_TEXTURE_FILTER;
+  GPULineDetectMode gpu_line_detect_mode = DEFAULT_GPU_LINE_DETECT_MODE;
   GPUDownsampleMode gpu_downsample_mode = DEFAULT_GPU_DOWNSAMPLE_MODE;
   u8 gpu_downsample_scale = 1;
   GPUWireframeMode gpu_wireframe_mode = DEFAULT_GPU_WIREFRAME_MODE;
@@ -378,6 +379,10 @@ struct Settings
   static const char* GetTextureFilterName(GPUTextureFilter filter);
   static const char* GetTextureFilterDisplayName(GPUTextureFilter filter);
 
+  static std::optional<GPULineDetectMode> ParseLineDetectModeName(const char* str);
+  static const char* GetLineDetectModeName(GPULineDetectMode filter);
+  static const char* GetLineDetectModeDisplayName(GPULineDetectMode filter);
+
   static std::optional<GPUDownsampleMode> ParseDownsampleModeName(const char* str);
   static const char* GetDownsampleModeName(GPUDownsampleMode mode);
   static const char* GetDownsampleModeDisplayName(GPUDownsampleMode mode);
@@ -428,6 +433,7 @@ struct Settings
 
   static constexpr GPURenderer DEFAULT_GPU_RENDERER = GPURenderer::Automatic;
   static constexpr GPUTextureFilter DEFAULT_GPU_TEXTURE_FILTER = GPUTextureFilter::Nearest;
+  static constexpr GPULineDetectMode DEFAULT_GPU_LINE_DETECT_MODE = GPULineDetectMode::Disabled;
   static constexpr GPUDownsampleMode DEFAULT_GPU_DOWNSAMPLE_MODE = GPUDownsampleMode::Disabled;
   static constexpr GPUWireframeMode DEFAULT_GPU_WIREFRAME_MODE = GPUWireframeMode::Disabled;
   static constexpr ConsoleRegion DEFAULT_CONSOLE_REGION = ConsoleRegion::Auto;

src/core/system.cpp

@@ -3644,6 +3644,7 @@ void System::CheckForSettingsChanges(const Settings& old_settings)
         g_settings.gpu_debanding != old_settings.gpu_debanding ||
         g_settings.gpu_scaled_dithering != old_settings.gpu_scaled_dithering ||
         g_settings.gpu_texture_filter != old_settings.gpu_texture_filter ||
+        g_settings.gpu_line_detect_mode != old_settings.gpu_line_detect_mode ||
         g_settings.gpu_disable_interlacing != old_settings.gpu_disable_interlacing ||
         g_settings.gpu_force_ntsc_timings != old_settings.gpu_force_ntsc_timings ||
         g_settings.gpu_24bit_chroma_smoothing != old_settings.gpu_24bit_chroma_smoothing ||

src/core/types.h

@@ -105,6 +105,15 @@ enum class GPUWireframeMode : u8
   Count,
 };
 
+enum class GPULineDetectMode : u8
+{
+  Disabled,
+  Quads,
+  BasicTriangles,
+  AggressiveTriangles,
+  Count
+};
+
 enum class DisplayCropMode : u8
 {
   None,

src/duckstation-qt/enhancementsettingswidget.cpp

@@ -17,6 +17,12 @@ EnhancementSettingsWidget::EnhancementSettingsWidget(SettingsWindow* dialog, QWi
   setupAdditionalUi();
 
   SettingWidgetBinder::BindWidgetToIntSetting(sif, m_ui.resolutionScale, "GPU", "ResolutionScale", 1);
+  SettingWidgetBinder::BindWidgetToEnumSetting(sif, m_ui.textureFiltering, "GPU", "TextureFilter",
+                                               &Settings::ParseTextureFilterName, &Settings::GetTextureFilterName,
+                                               Settings::DEFAULT_GPU_TEXTURE_FILTER);
+  SettingWidgetBinder::BindWidgetToEnumSetting(sif, m_ui.gpuLineDetectMode, "GPU", "LineDetectMode",
+                                               &Settings::ParseLineDetectModeName, &Settings::GetLineDetectModeName,
+                                               Settings::DEFAULT_GPU_LINE_DETECT_MODE);
   SettingWidgetBinder::BindWidgetToEnumSetting(sif, m_ui.gpuDownsampleMode, "GPU", "DownsampleMode",
                                                &Settings::ParseDownsampleModeName, &Settings::GetDownsampleModeName,
                                                Settings::DEFAULT_GPU_DOWNSAMPLE_MODE);
@@ -28,9 +34,6 @@ EnhancementSettingsWidget::EnhancementSettingsWidget(SettingsWindow* dialog, QWi
   SettingWidgetBinder::BindWidgetToBoolSetting(sif, m_ui.forceNTSCTimings, "GPU", "ForceNTSCTimings", false);
   SettingWidgetBinder::BindWidgetToBoolSetting(sif, m_ui.force43For24Bit, "Display", "Force4_3For24Bit", false);
   SettingWidgetBinder::BindWidgetToBoolSetting(sif, m_ui.chromaSmoothingFor24Bit, "GPU", "ChromaSmoothing24Bit", false);
-  SettingWidgetBinder::BindWidgetToEnumSetting(sif, m_ui.textureFiltering, "GPU", "TextureFilter",
-                                               &Settings::ParseTextureFilterName, &Settings::GetTextureFilterName,
-                                               Settings::DEFAULT_GPU_TEXTURE_FILTER);
   SettingWidgetBinder::BindWidgetToBoolSetting(sif, m_ui.widescreenHack, "GPU", "WidescreenHack", false);
   SettingWidgetBinder::BindWidgetToBoolSetting(sif, m_ui.useSoftwareRendererForReadbacks, "GPU",
                                                "UseSoftwareRendererForReadbacks", false);
@@ -105,10 +108,14 @@ EnhancementSettingsWidget::EnhancementSettingsWidget(SettingsWindow* dialog, QWi
                                 "Only applies to the hardware renderers."));
   dialog->registerWidgetHelp(
     m_ui.textureFiltering, tr("Texture Filtering"),
-    QString::fromUtf8(Settings::GetTextureFilterDisplayName(GPUTextureFilter::Nearest)),
+    QString::fromUtf8(Settings::GetTextureFilterDisplayName(Settings::DEFAULT_GPU_TEXTURE_FILTER)),
     tr("Smooths out the blockiness of magnified textures on 3D object by using filtering. <br>Will have a "
        "greater effect on higher resolution scales. Only applies to the hardware renderers. <br>The JINC2 and "
        "especially xBR filtering modes are very demanding, and may not be worth the speed penalty."));
+  dialog->registerWidgetHelp(m_ui.gpuLineDetectMode, tr("Line Detection"),
+                             QString::fromUtf8(Settings::GetLineDetectModeName(Settings::DEFAULT_GPU_LINE_DETECT_MODE)),
+                             tr("Attempts to detect one pixel high/wide lines that rely on non-upscaled rasterization "
+                                "behavior, filling in gaps introduced by upscaling."));
   dialog->registerWidgetHelp(
     m_ui.widescreenHack, tr("Widescreen Hack"), tr("Unchecked"),
     tr("Scales vertex positions in screen-space to a widescreen aspect ratio, essentially "
@@ -190,6 +197,12 @@ void EnhancementSettingsWidget::setupAdditionalUi()
       QString::fromUtf8(Settings::GetTextureFilterDisplayName(static_cast<GPUTextureFilter>(i))));
   }
 
+  for (u32 i = 0; i < static_cast<u32>(GPULineDetectMode::Count); i++)
+  {
+    m_ui.gpuLineDetectMode->addItem(
+      QString::fromUtf8(Settings::GetLineDetectModeDisplayName(static_cast<GPULineDetectMode>(i))));
+  }
+
   for (u32 i = 0; i < static_cast<u32>(GPUDownsampleMode::Count); i++)
   {
     m_ui.gpuDownsampleMode->addItem(

src/duckstation-qt/enhancementsettingswidget.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>640</width>
-    <height>452</height>
+    <height>480</height>
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -49,14 +49,14 @@
       <item row="2" column="1">
        <widget class="QComboBox" name="textureFiltering"/>
       </item>
-      <item row="3" column="0">
+      <item row="4" column="0">
        <widget class="QLabel" name="label">
         <property name="text">
          <string>Downsampling:</string>
         </property>
        </widget>
       </item>
-      <item row="3" column="1">
+      <item row="4" column="1">
        <layout class="QHBoxLayout" name="gpuDownsampleLayout" stretch="1,0">
         <item>
          <widget class="QComboBox" name="gpuDownsampleMode"/>
@@ -76,7 +76,7 @@
         </item>
        </layout>
       </item>
-      <item row="4" column="0" colspan="2">
+      <item row="5" column="0" colspan="2">
        <layout class="QGridLayout" name="gridLayout_2">
         <item row="0" column="0">
          <widget class="QCheckBox" name="trueColor">
@@ -122,6 +122,16 @@
         </item>
        </layout>
       </item>
+      <item row="3" column="0">
+       <widget class="QLabel" name="label_4">
+        <property name="text">
+         <string>Line Detection:</string>
+        </property>
+       </widget>
+      </item>
+      <item row="3" column="1">
+       <widget class="QComboBox" name="gpuLineDetectMode"/>
+      </item>
      </layout>
     </widget>
    </item>