overlay: fix subscreen overlay rendering for popn (#869)

## Link to GitHub Issue or related Pull Request, if one exists
n/a

## Description of change
For popn HC, some transparency effects, like the one for touch feedback,
rendered incorrectly; this is due to how alpha channel is handled for
subscreen overlay drawing on top of ImGui.

## Testing
Tested popn and iidx.

src/spice2x/api/modules/touch.cpp

@@ -12,7 +12,9 @@
 #include "touch/touch.h"
 #include "touch/native/inject.h"
 #include "touch/native/nativetouchhook.h"
+#include "touch/native/transform.h"
 #include "util/utils.h"
+#include "games/gitadora/gitadora.h"
 #include "games/iidx/iidx.h"
 
 using namespace std::placeholders;
@@ -40,6 +42,35 @@ namespace api::modules {
         return nativetouch::inject::inject_synthetic_touch(position, true);
     }
 
+    // map API coordinates onto the touch space SDVX reads, which depends on how it is displayed
+    static void sdvx_touch_errata(
+            int &x, int &y, bool use_native, int canvas_w, int canvas_h) {
+
+        // windowed coordinates already match the sub screen window they land on
+        if (GRAPHICS_WINDOWED) {
+            return;
+        }
+
+        // landscape mode: native injection hands the game these coordinates
+        // unchanged, so apply the rotation the touchscreen gets, while wintouchemu instead
+        // rotates them later through the subscreen overlay
+        if (GRAPHICS_FS_ORIENTATION_SWAP) {
+            if (use_native) {
+                POINT position { x, y };
+                if (nativetouch::transform::sdvx_landscape_rotate(&position, canvas_w, canvas_h)) {
+                    x = position.x;
+                    y = position.y;
+                }
+            }
+            return;
+        }
+
+        // rotate into the portrait touch space
+        const int x_raw = x;
+        x = canvas_w - y;
+        y = x_raw;
+    }
+
     Touch::Touch() : Module("touch") {
         is_sdvx = avs::game::is_model("KFC");
 
@@ -55,8 +86,8 @@ namespace api::modules {
         native_canvas_w = 0;
         native_canvas_h = 0;
         if (is_sdvx) {
-            // windowed and landscape API coordinates already match the primary screen orientation;
-            // fullscreen portrait coordinates are rotated by apply_touch_errata
+            // windowed API coordinates land on the sub screen window as-is; fullscreen
+            // coordinates are rotated into the game's touch space by apply_touch_errata
             const bool landscape_coordinates =
                 GRAPHICS_WINDOWED || GRAPHICS_FS_ORIENTATION_SWAP;
             native_canvas_w = landscape_coordinates ? 1920 : 1080;
@@ -69,6 +100,10 @@ namespace api::modules {
             // pop'n music API touch surface
             native_canvas_w = 1280;
             native_canvas_h = 800;
+        } else if (games::gitadora::is_arena_model()) {
+            // GITADORA arena SMALL subscreen, either in its own window or in the overlay
+            native_canvas_w = games::gitadora::ARENA_SUBSCREEN_WIDTH;
+            native_canvas_h = games::gitadora::ARENA_SUBSCREEN_HEIGHT;
         }
 
         functions["read"] = std::bind(&Touch::read, this, _1, _2);
@@ -212,19 +247,14 @@ namespace api::modules {
     }
 
     void Touch::apply_touch_errata(int &x, int &y) {
-        int x_raw = x;
-        int y_raw = y;
-
         if (is_tdj_fhd) {
             // deal with TDJ FHD resolution mismatch (upgrade 720p to 1080p)
             // we don't know what screen is being shown on the companion and the API doesn't specify
             // the target of the touch events so just assume it's the sub screen
-            x = x_raw * 1920 / 1280;
-            y = y_raw * 1080 / 720;
-        } else if (is_sdvx && !GRAPHICS_WINDOWED && !GRAPHICS_FS_ORIENTATION_SWAP) {
-            // rotate API coordinates into SDVX's portrait touch space
-            x = 1080 - y_raw;
-            y = x_raw;
+            x = x * 1920 / 1280;
+            y = y * 1080 / 720;
+        } else if (is_sdvx) {
+            sdvx_touch_errata(x, y, use_native, native_canvas_w, native_canvas_h);
         }
     }
 }

src/spice2x/games/gitadora/gitadora.cpp

@@ -41,6 +41,7 @@ namespace games::gitadora {
     bool ARENA_TWO_HEAD_EXCLUSIVE = false;
     std::optional<std::string> ASIO_DRIVER = std::nullopt;
     bool ALLOW_REALTEK_AUDIO = false;
+    bool NATIVE_TOUCH = false;
 
     /*
      * Prevent GitaDora from creating folders on F drive
@@ -809,17 +810,16 @@ namespace games::gitadora {
                 hooks::audio::INJECT_FAKE_REALTEK_AUDIO = true;
             }
 
-            // Single-window mode needs touch injection for its overlay. Two-head fullscreen
-            // mode uses the real SMALL output, so it only needs the display-topology shim.
-            if (GRAPHICS_PREVENT_SECONDARY_WINDOWS) {
-                // enable touch hook for subscreen overlay
-                const auto native_touch_ready = !wintouchemu::FORCE &&
-                    nativetouch::hook(avs::game::DLL_INSTANCE);
-                if (!native_touch_ready) {
-                    wintouchemu::FORCE = true;
-                    wintouchemu::INJECT_MOUSE_AS_WM_TOUCH = true;
-                    wintouchemu::hook("GITADORA", avs::game::DLL_INSTANCE);
-                }
+            // touch injection drives mouse-as-touch and API touch for the subscreen,
+            // no matter whether it is drawn by the overlay (single-window mode) or by
+            // the dedicated SMALL window
+            NATIVE_TOUCH = !wintouchemu::FORCE &&
+                nativetouch::hook(avs::game::DLL_INSTANCE);
+            if (!NATIVE_TOUCH && GRAPHICS_PREVENT_SECONDARY_WINDOWS) {
+                // the legacy fallback can only feed the subscreen overlay
+                wintouchemu::FORCE = true;
+                wintouchemu::INJECT_MOUSE_AS_WM_TOUCH = true;
+                wintouchemu::hook("GITADORA", avs::game::DLL_INSTANCE);
             }
 
 #if !SPICE_XP

src/spice2x/games/gitadora/gitadora.h

@@ -23,6 +23,11 @@ namespace games::gitadora {
     extern bool ARENA_TWO_HEAD_EXCLUSIVE;
     extern std::optional<std::string> ASIO_DRIVER;
     extern bool ALLOW_REALTEK_AUDIO;
+    extern bool NATIVE_TOUCH;
+
+    // arena SMALL subscreen (touch panel) resolution
+    static constexpr int ARENA_SUBSCREEN_WIDTH = 800;
+    static constexpr int ARENA_SUBSCREEN_HEIGHT = 1280;
 
     class GitaDoraGame : public games::Game {
     public:

src/spice2x/hooks/graphics/backends/d3d9/d3d9_backend.cpp

@@ -1520,6 +1520,10 @@ void graphics_d3d9_on_present(
         graphics_d3d9_process_screenshot(device, wrapped_device);
     }
 
+    // API capture always includes the overlay; it must run before the subscreen present
+    // below, which leaves the arena SMALL back buffer black
+    graphics_d3d9_process_capture(device, wrapped_device);
+
     // for IIDX TDJ / SDVX UFC, handle subscreen
     const bool is_vm = games::sdvx::is_valkyrie_model();
     const bool is_tdj = avs::game::is_model("LDJ") && games::iidx::TDJ_MODE;
@@ -1533,9 +1537,6 @@ void graphics_d3d9_on_present(
     if (is_mfc) {
         wintouchemu::update();
     }
-
-    // API capture always includes the overlay
-    graphics_d3d9_process_capture(device, wrapped_device);
 }
 
 void update_backbuffer_dimensions(D3DPRESENT_PARAMETERS *params) {

src/spice2x/hooks/graphics/backends/d3d9/d3d9_gfdm.h

@@ -4,10 +4,12 @@
 
 #include <d3d9.h>
 
+#include "games/gitadora/gitadora.h"
+
 inline constexpr UINT GFDM_SIDE_WIDTH = 1080;
 inline constexpr UINT GFDM_SIDE_HEIGHT = 1920;
-inline constexpr UINT GFDM_SMALL_WIDTH = 800;
-inline constexpr UINT GFDM_SMALL_HEIGHT = 1280;
+inline constexpr UINT GFDM_SMALL_WIDTH = games::gitadora::ARENA_SUBSCREEN_WIDTH;
+inline constexpr UINT GFDM_SMALL_HEIGHT = games::gitadora::ARENA_SUBSCREEN_HEIGHT;
 inline constexpr UINT GFDM_LOGICAL_HEAD_COUNT = 4;
 inline constexpr UINT GFDM_NATIVE_SMALL_SWAPCHAIN = 1;
 

src/spice2x/hooks/graphics/graphics.cpp

@@ -33,6 +33,7 @@
 #include "util/utils.h"
 #include "misc/wintouchemu.h"
 #include "touch/native/inject.h"
+#include "touch/native/nativetouchhook.h"
 #include "util/time.h"
 #include "rawinput/rawinput.h"
 
@@ -216,6 +217,18 @@ static void gitadora_remember_window(HWND hWnd, const std::string &window_name)
     } else if (window_name == "SMALL") {
         GFDM_SUBSCREEN_WINDOW = hWnd;
     }
+
+    // touch belongs to the SMALL panel when it exists, otherwise to the main window
+    // that draws the subscreen overlay
+    const bool hosts_touch = window_name == "SMALL" ||
+        (window_name == "GITADORA" && !graphics_gitadora_has_dedicated_subscreen());
+    if (nativetouch::is_hooked() && hWnd != nullptr && hosts_touch) {
+        nativetouch::inject::set_preferred_injection_window(hWnd);
+    }
+}
+
+bool graphics_gitadora_has_dedicated_subscreen() {
+    return GFDM_SUBSCREEN_WINDOW != nullptr;
 }
 
 bool graphics_gitadora_prepare_two_head_device_window(
@@ -616,8 +629,10 @@ static HWND WINAPI CreateWindowExA_hook(DWORD dwExStyle, LPCSTR lpClassName, LPC
         }
     }
 
+    const bool is_sdvx = avs::game::is_model("KFC");
     bool is_tdj_sub_window = avs::game::is_model("LDJ") && window_name.ends_with(" sub");
-    bool is_sdvx_sub_window = avs::game::is_model("KFC") && window_name.ends_with(" Sub Screen");
+    bool is_sdvx_sub_window = is_sdvx && window_name.ends_with(" Sub Screen");
+    bool is_sdvx_main_window = is_sdvx && window_name.ends_with(" Main Screen");
     bool is_popn_sub_window = avs::game::is_model("M39") && window_name.ends_with("Sub Screen");
     const std::string gfdm_window_name = games::gitadora::is_arena_model()
         ? gitadora_canonical_window_name(effective_window_name)
@@ -720,6 +735,20 @@ static HWND WINAPI CreateWindowExA_hook(DWORD dwExStyle, LPCSTR lpClassName, LPC
         graphics_hook_subscreen_window(SDVX_SUBSCREEN_WINDOW);
     }
 
+    // SDVX registers touch on both windows, so name the one synthetic touches must land on
+    // instead of letting window creation order decide: the sub screen window when windowed,
+    // the main window in fullscreen since the game reads it in primary-display coordinates
+    if (nativetouch::is_hooked() &&
+        result != nullptr &&
+        (GRAPHICS_WINDOWED ? is_sdvx_sub_window : is_sdvx_main_window)) {
+        log_misc(
+            "graphics",
+            "SDVX touch surface is {}, {}",
+            fmt::ptr(result),
+            window_name);
+        nativetouch::inject::set_preferred_injection_window(result);
+    }
+
     // only hook touch window if multiple windows are allowed
     if (gfdm_window_name == "LEFT" || gfdm_window_name == "RIGHT") {
         gitadora_remember_window(result, gfdm_window_name);
@@ -731,6 +760,11 @@ static HWND WINAPI CreateWindowExA_hook(DWORD dwExStyle, LPCSTR lpClassName, LPC
         if (GRAPHICS_WINDOWED && !GRAPHICS_PREVENT_SECONDARY_WINDOWS) {
             graphics_hook_subscreen_window(GFDM_SUBSCREEN_WINDOW);
         }
+
+        // the dedicated SMALL window is the touch panel; mouse and API touch target it
+        if (nativetouch::is_hooked() && result != nullptr) {
+            nativetouch::inject::register_and_attach_window(result);
+        }
     }
     if (is_gfdm_window && GRAPHICS_WINDOWED && !GRAPHICS_PREVENT_SECONDARY_WINDOWS) {
         gitadora_force_window_style(result);
@@ -1104,6 +1138,15 @@ static BOOL WINAPI ShowWindow_hook(HWND hWnd, int nCmdShow) {
         return true;
     }
 
+    // fullscreen SDVX keeps two adapters so the subscreen overlay can draw, so the game still
+    // creates the sub window even when the user asked for it to be gone
+    if (avs::game::is_model("KFC") &&
+        GRAPHICS_PREVENT_SECONDARY_WINDOWS &&
+        hWnd == SDVX_SUBSCREEN_WINDOW) {
+        log_info("graphics", "ShowWindow_hook - hiding sub window {}", fmt::ptr(hWnd));
+        return true;
+    }
+
     // call original
     return ShowWindow_orig(hWnd, nCmdShow);
 }
@@ -1320,7 +1363,9 @@ void graphics_hook_window(HWND hWnd, D3DPRESENT_PARAMETERS *pPresentationParamet
         const bool native_touch_overlay =
             (games::iidx::NATIVE_TOUCH && games::iidx::TDJ_MODE && !GRAPHICS_IIDX_WSUB) ||
             (games::popn::NATIVE_TOUCH &&
-             games::popn::is_pikapika_model() && GRAPHICS_PREVENT_SECONDARY_WINDOWS);
+             games::popn::is_pikapika_model() && GRAPHICS_PREVENT_SECONDARY_WINDOWS) ||
+            (games::gitadora::NATIVE_TOUCH &&
+             games::gitadora::is_arena_model() && GRAPHICS_PREVENT_SECONDARY_WINDOWS);
         if (native_touch_overlay) {
             nativetouch::inject::register_and_attach_window(hWnd);
         }

src/spice2x/hooks/graphics/graphics.h

@@ -121,6 +121,7 @@ extern bool D3D9_DEVICE_HOOK_DISABLE;
 
 void graphics_init();
 void graphics_hook_window(HWND hWnd, D3DPRESENT_PARAMETERS *pPresentationParameters);
+bool graphics_gitadora_has_dedicated_subscreen();
 // The native GITADORA two-head D3D9 group uses the game's named SMALL
 // device window for the native physical SMALL head. The game requests
 // D3DCREATE_NOWINDOWCHANGES, so this host must be made borderless and sized

src/spice2x/overlay/windows/generic_sub.cpp

@@ -25,6 +25,15 @@ namespace overlay::windows {
     const ImVec4 YELLOW(1.f, 1.f, 0.f, 1.f);
     const ImVec4 WHITE(1.f, 1.f, 1.f, 1.f);
 
+    // a subscreen is an already-composited backbuffer, so its alpha bits are not
+    // meaningful for display. Use AddImage's diffuse alpha (opaque by default)
+    // instead of the texture alpha while preserving ImGui's normal blend state.
+    static void ignore_texture_alpha(const ImDrawList *, const ImDrawCmd *command) {
+        auto device = static_cast<IDirect3DDevice9 *>(command->UserCallbackData);
+        device->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
+        device->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_SELECTARG2);
+    }
+
     GenericSubScreen::GenericSubScreen(SpiceOverlay *overlay) : Window(overlay), device(overlay->get_device()) {
         this->remove_window_padding = true;
         // ImGuiWindowFlags_NoBackground is needed as the background is drawn on top of the subscreen image
@@ -239,10 +248,13 @@ namespace overlay::windows {
         auto draw_list = this->draws_window
             ? ImGui::GetWindowDrawList()
             : ImGui::GetBackgroundDrawList();
+        draw_list->AddCallback(ignore_texture_alpha, this->device);
         draw_list->AddImage(
             reinterpret_cast<ImTextureID>(this->texture),
             overlay_content_top_left,
             bottom_right);
+        // following ImGui draws should resume normal texture-alpha modulation
+        draw_list->AddCallback(ImGui::GetPlatformIO().DrawCallback_ResetRenderState);
 
         if (this->draws_window) {
             // draw an invisible button so that it swallows mouse input

src/spice2x/touch/native/inject.cpp

@@ -123,6 +123,30 @@ namespace nativetouch::inject {
     // asks the touch window thread to send an UPDATE when the game loop runs elsewhere
     static UINT contact_refresh_message;
 
+    // the window that shows the touch surface; contacts can be registered from any thread,
+    // so this is published by the graphics window hooks rather than derived from the globals
+    static std::atomic<HWND> preferred_injection_window { nullptr };
+
+    void set_preferred_injection_window(HWND window) {
+        preferred_injection_window.store(window, std::memory_order_release);
+    }
+
+    // a game that publishes its touch surface needs injection only on that window
+    static bool is_published_touch_window(HWND window) {
+        const auto preferred = preferred_injection_window.load(std::memory_order_acquire);
+        return preferred == nullptr || window == preferred;
+    }
+
+    // games can register several windows for touch; keep synthetic contacts on the one
+    // that actually shows the touch surface
+    static bool is_preferred_injection_window(HWND window) {
+        if (GRAPHICS_IIDX_WSUB) {
+            return window == TDJ_SUBSCREEN_WINDOW;
+        }
+
+        return is_published_touch_window(window);
+    }
+
     // submit one synthetic contact frame to Windows touch injection
     static bool inject_touch_frame(
             POINT position, POINTER_FLAGS pointer_flags, bool retry_if_not_ready = false) {
@@ -325,11 +349,22 @@ namespace nativetouch::inject {
             if (contact_state.input_window == window) {
                 release_active_contact();
             }
+
             HWND expected_window = window;
             injection_window.compare_exchange_strong(
                 expected_window, nullptr, std::memory_order_acq_rel);
+
+            HWND expected_preferred_window = window;
+            preferred_injection_window.compare_exchange_strong(
+                expected_preferred_window, nullptr, std::memory_order_acq_rel);
+
+            if (GRAPHICS_IIDX_WSUB) {
+                HWND expected_delivery_window = window;
+                touch_delivery_window.compare_exchange_strong(
+                    expected_delivery_window, nullptr, std::memory_order_acq_rel);
+            }
+
             contact_refresh_pending.store(false, std::memory_order_release);
-            touch_delivery_window.store(nullptr, std::memory_order_release);
             RemoveWindowSubclass(window, touch_window_subclass_proc, subclass_id);
         }
 
@@ -370,7 +405,7 @@ namespace nativetouch::inject {
         }
 
         // publish the UI-thread target for synthetic touch requests
-        if (!GRAPHICS_IIDX_WSUB || window == TDJ_SUBSCREEN_WINDOW) {
+        if (is_preferred_injection_window(window)) {
             injection_window.store(window, std::memory_order_release);
         }
         log_misc(
@@ -403,7 +438,7 @@ namespace nativetouch::inject {
         // call original
         const auto result = RegisterTouchWindow_orig(window, flags);
 
-        if (result) {
+        if (result && is_published_touch_window(window)) {
             // attach but don't register for touch messages
             // (we're already in the middle of RegisterTouchWindow as a result
             // of the game calling it)

src/spice2x/touch/native/inject.h

@@ -7,6 +7,7 @@ struct tagTOUCHINPUT;
 namespace nativetouch::inject {
     void attach_window(HWND window);
     void register_and_attach_window(HWND window);
+    void set_preferred_injection_window(HWND window);
     bool hook_available(HMODULE module);
     bool hook(HMODULE module);
     bool inject_synthetic_touch(POINT position, bool down);

src/spice2x/touch/native/transform.cpp

@@ -38,6 +38,11 @@ namespace nativetouch::transform {
             window == TDJ_SUBSCREEN_WINDOW;
     }
 
+    // mouse-as-touch only applies while the cursor is over the target window
+    static bool is_cursor_over_window(HWND window, POINT position) {
+        return screen_to_game_client(window, &position);
+    }
+
     // convert game touch coordinates to Windows desktop coordinates
     bool game_to_screen(HWND window, POINT *position) {
         if (settings::SYNTHETIC_TOUCH_USES_CLIENT_COORDINATES) {
@@ -66,7 +71,13 @@ namespace nativetouch::transform {
         return ClientToScreen(window, position) != FALSE;
     }
 
-    static bool has_active_overlay_transform() {
+    static bool overlay_owns_touch_input() {
+        // the arena SMALL window is the touch surface whenever it exists, so the
+        // subscreen overlay must not claim touch input in those window modes
+        if (graphics_gitadora_has_dedicated_subscreen()) {
+            return false;
+        }
+
         return overlay::OVERLAY != nullptr &&
             overlay::OVERLAY->get_active() &&
             overlay::OVERLAY->has_subscreen_touch_transform();
@@ -83,23 +94,28 @@ namespace nativetouch::transform {
         return overlay::OVERLAY->transform_touch_point(&position->x, &position->y);
     }
 
-    // the digitizer is mapped to the zero-based primary display, while SDVX
-    // still expects portrait coordinates when its image is rendered in landscape:
+    // SDVX still expects portrait coordinates when its image is rendered in landscape:
     // (x, y) -> (width * (1 - y / height), height * x / width).
+    bool sdvx_landscape_rotate(POINT *position, LONG width, LONG height) {
+        if (width <= 0 || height <= 0) {
+            return false;
+        }
+
+        const auto input_x = position->x;
+        position->x = width - MulDiv(position->y, width, height);
+        position->y = MulDiv(input_x, height, width);
+        return true;
+    }
+
+    // the digitizer is mapped to the zero-based primary display, so the contact is already
+    // in the effective landscape resolution the rotation is based on
     static bool transform_sdvx_landscape_touch_position(POINT *position) {
         const auto landscape_width = static_cast<LONG>(GRAPHICS_FS_CUSTOM_RESOLUTION.has_value() ?
             GRAPHICS_FS_CUSTOM_RESOLUTION.value().first : GRAPHICS_FS_ORIGINAL_HEIGHT);
         const auto landscape_height = static_cast<LONG>(GRAPHICS_FS_CUSTOM_RESOLUTION.has_value() ?
             GRAPHICS_FS_CUSTOM_RESOLUTION.value().second : GRAPHICS_FS_ORIGINAL_WIDTH);
-        if (landscape_width <= 0 || landscape_height <= 0) {
-            return false;
-        }
 
-        const auto input_x = position->x;
-        position->x = landscape_width -
-            MulDiv(position->y, landscape_width, landscape_height);
-        position->y = MulDiv(input_x, landscape_height, landscape_width);
-        return true;
+        return sdvx_landscape_rotate(position, landscape_width, landscape_height);
     }
 
     // convert physical screen coordinates to game touch coordinates for a known target
@@ -132,7 +148,7 @@ namespace nativetouch::transform {
 
         // check if subscreen overlay is active and can transform the touch point;
         // if not, the touch point is valid as-is
-        if (!has_active_overlay_transform()) {
+        if (!overlay_owns_touch_input()) {
             return true;
         }
 
@@ -149,8 +165,14 @@ namespace nativetouch::transform {
 
         // exception: sdvx windowed subscreen does not use the subscreen overlay transform
         if (GRAPHICS_WINDOWED && window == SDVX_SUBSCREEN_WINDOW) {
-            POINT client_position = *position;
-            return screen_to_game_client(window, &client_position);
+            return is_cursor_over_window(window, *position);
+        }
+
+        // exception: the arena SMALL window is the touch panel, so accept the mouse there
+        // (and only there) with the coordinates a real contact on it would produce
+        if (graphics_gitadora_has_dedicated_subscreen()) {
+            return window == GFDM_SUBSCREEN_WINDOW &&
+                is_cursor_over_window(window, *position);
         }
 
         // if this game has a subscreen overlay that can transform touch input
@@ -168,7 +190,7 @@ namespace nativetouch::transform {
     // route hardware screen coordinates through dedicated or overlay mapping and report the result
     Result hardware_to_game(POINT *position) {
         const auto dedicated_subscreen = is_tdj_dedicated_subscreen(TDJ_SUBSCREEN_WINDOW);
-        const auto active_overlay = has_active_overlay_transform();
+        const auto active_overlay = overlay_owns_touch_input();
 
         // special case for SDVX landscape mode
         if (!dedicated_subscreen && !active_overlay &&

src/spice2x/touch/native/transform.h

@@ -10,6 +10,7 @@ namespace nativetouch::transform {
     };
 
     bool is_tdj_dedicated_subscreen(HWND window);
+    bool sdvx_landscape_rotate(POINT *position, LONG width, LONG height);
     bool game_to_screen(HWND window, POINT *position);
     bool screen_to_game(HWND window, POINT *position);
     bool mouse_to_game(HWND window, POINT *position);