touch: inject touches from spiceapi to native touch hooks (#824)

## Link to GitHub Issue or related Pull Request, if one exists
Fixes #814

## Description of change
Touches via the API wasn't being delivered to native touch hook;
implement this, which closes the last gap we have vs. wintouchemu.

While we're here, implement popn subscreen support for companion as
well.

## Testing
Tested for iidx/sdvx/popn

src/spice2x/api/modules/touch.cpp

@@ -1,5 +1,7 @@
 #include "touch.h"
 
+#include <algorithm>
+#include <cstdint>
 #include <functional>
 
 #include "external/rapidjson/document.h"
@@ -8,6 +10,8 @@
 #include "misc/eamuse.h"
 #include "launcher/launcher.h"
 #include "touch/touch.h"
+#include "touch/native/inject.h"
+#include "touch/native/nativetouchhook.h"
 #include "util/utils.h"
 #include "games/iidx/iidx.h"
 
@@ -17,6 +21,25 @@ using namespace rapidjson;
 
 namespace api::modules {
 
+    static bool inject_native_touch(
+            const std::vector<TouchPoint> &touch_points, int canvas_w, int canvas_h) {
+        if (touch_points.empty()) {
+            // no active touches remain; release the synthetic contact
+            return nativetouch::inject::inject_synthetic_touch({ 0, 0 }, false);
+        }
+
+        // only a single synthetic contact is supported, so just use the first touch point
+        const auto &touch = touch_points.front();
+        POINT position { touch.x, touch.y };
+        if (canvas_w > 0 && canvas_h > 0) {
+            return nativetouch::inject::inject_synthetic_touch_from_canvas(
+                position,
+                { canvas_w, canvas_h },
+                true);
+        }
+        return nativetouch::inject::inject_synthetic_touch(position, true);
+    }
+
     Touch::Touch() : Module("touch") {
         is_sdvx = avs::game::is_model("KFC");
 
@@ -26,6 +49,25 @@ namespace api::modules {
             is_tdj_fhd = false;
         }
 
+        use_native = nativetouch::is_hooked();
+
+        // resolution the API/companion sends native touch coordinates in (after errata)
+        native_canvas_w = 0;
+        native_canvas_h = 0;
+        if (is_sdvx) {
+            // exceed gear subscreen, portrait after the rotation applied in apply_touch_errata
+            native_canvas_w = 1080;
+            native_canvas_h = 1920;
+        } else if (avs::game::is_model("LDJ")) {
+            // TDJ subscreen; FHD models are upscaled to 1080p by apply_touch_errata
+            native_canvas_w = is_tdj_fhd ? 1920 : 1280;
+            native_canvas_h = is_tdj_fhd ? 1080 : 720;
+        } else if (avs::game::is_model("M39")) {
+            // pop'n music API touch surface
+            native_canvas_w = 1280;
+            native_canvas_h = 800;
+        }
+
         functions["read"] = std::bind(&Touch::read, this, _1, _2);
         functions["write"] = std::bind(&Touch::write, this, _1, _2);
         functions["write_reset"] = std::bind(&Touch::write_reset, this, _1, _2);
@@ -99,8 +141,12 @@ namespace api::modules {
         }
 
         // apply touch points
+        if (use_native) {
+            write_native(touch_points);
+        } else {
             touch_write_points(&touch_points);
         }
+    }
 
     /**
      * write_reset(id: uint, ...)
@@ -123,8 +169,44 @@ namespace api::modules {
         }
 
         // remove all IDs
+        if (use_native) {
+            write_reset_native(touch_point_ids);
+        } else {
             touch_remove_points(&touch_point_ids);
         }
+    }
+
+    void Touch::write_native(const std::vector<TouchPoint> &touch_points) {
+        if (touch_points.empty()) {
+            return;
+        }
+
+        std::lock_guard<std::mutex> lock(native_touch_mutex);
+        const auto touch_id = touch_points.front().id;
+        if (native_touch_id && *native_touch_id != touch_id) {
+            if (!inject_native_touch({}, native_canvas_w, native_canvas_h)) {
+                return;
+            }
+            native_touch_id.reset();
+        }
+        if (inject_native_touch(touch_points, native_canvas_w, native_canvas_h)) {
+            native_touch_id = touch_id;
+        }
+    }
+
+    void Touch::write_reset_native(const std::vector<DWORD> &touch_point_ids) {
+        std::lock_guard<std::mutex> lock(native_touch_mutex);
+        if (!native_touch_id ||
+                std::find(
+                    touch_point_ids.begin(),
+                    touch_point_ids.end(),
+                    *native_touch_id) == touch_point_ids.end()) {
+            return;
+        }
+        if (inject_native_touch({}, native_canvas_w, native_canvas_h)) {
+            native_touch_id.reset();
+        }
+    }
 
     void Touch::apply_touch_errata(int &x, int &y) {
         int x_raw = x;

src/spice2x/api/modules/touch.h

@@ -1,8 +1,12 @@
 #pragma once
 
+#include <cstdint>
+#include <mutex>
+#include <optional>
 #include <vector>
 #include "api/module.h"
 #include "api/request.h"
+#include "touch/touch.h"
 
 namespace api::modules {
 
@@ -13,11 +17,21 @@ namespace api::modules {
     private:
         bool is_sdvx;
         bool is_tdj_fhd;
+        bool use_native;
+        std::mutex native_touch_mutex;
+        std::optional<uint32_t> native_touch_id;
+
+        // resolution the API/companion sends native touch coordinates in (after errata);
+        // used to normalize before mapping into the native injection window
+        int native_canvas_w;
+        int native_canvas_h;
 
         // function definitions
         void read(Request &req, Response &res);
         void write(Request &req, Response &res);
         void write_reset(Request &req, Response &res);
+        void write_native(const std::vector<TouchPoint> &touch_points);
+        void write_reset_native(const std::vector<DWORD> &touch_point_ids);
         void apply_touch_errata(int &x, int &y);
 
     };

src/spice2x/touch/native/inject.h

@@ -9,5 +9,6 @@ namespace nativetouch::inject {
     void register_and_attach_window(HWND window);
     void hook(HMODULE module);
     bool inject_synthetic_touch(POINT position, bool down);
+    bool inject_synthetic_touch_from_canvas(POINT position, SIZE canvas, bool down);
     bool transform_touch_input(tagTOUCHINPUT *point);
 }

src/spice2x/touch/native/inject_synthetic.cpp

@@ -16,6 +16,12 @@ namespace nativetouch::inject {
 
     constexpr UINT SYNTHETIC_CONTACT_TIMEOUT_MS = 100;
 
+    enum class SyntheticTouchMessage : WPARAM {
+        Up, // used by callers releasing a contact
+        DownGameSpace, // coordinates are relative to the game's logical touch surface
+        DownScreenSpace, // coordinates are absolute pixels in Windows desktop coordinates
+    };
+
     static std::once_flag synthetic_initialization_once;
     static int synthetic_contact_timer_token;
     static UINT synthetic_touch_message;
@@ -31,14 +37,29 @@ namespace nativetouch::inject {
     }
 
     // synthetic touches preempt the mouse and keep it disabled until release or timeout
-    static void begin_synthetic_contact(HWND window, POINT position) {
+    static void begin_synthetic_contact(HWND window, POINT position, bool screen_space) {
         // dedicated TDJ injects into the physical subscreen, so map Windows'
         // returned coordinates back into the game's touch coordinate space
         const auto transform_returned_coordinates =
             transform::is_tdj_dedicated_subscreen(window);
-        if (!transform::game_to_screen(window, &position)) {
+        if (!screen_space && !transform::game_to_screen(window, &position)) {
             return;
         }
+
+        const auto timer_id = reinterpret_cast<UINT_PTR>(&synthetic_contact_timer_token);
+
+        // when this producer already owns the contact, move it instead of releasing and
+        // re-pressing so continuous input (such as the API surface) drags smoothly
+        if (contact_is_owned_by(ContactOwner::Synthetic, window)) {
+            if (update_contact(ContactOwner::Synthetic, window, position)) {
+                // refresh the safety timeout while updates keep arriving
+                if (SetTimer(window, timer_id, SYNTHETIC_CONTACT_TIMEOUT_MS, nullptr)) {
+                    set_contact_timer(ContactOwner::Synthetic, window, timer_id);
+                }
+                return;
+            }
+        }
+
         if (!release_active_contact()) {
             return;
         }
@@ -50,7 +71,6 @@ namespace nativetouch::inject {
             return;
         }
 
-        const auto timer_id = reinterpret_cast<UINT_PTR>(&synthetic_contact_timer_token);
         if (SetTimer(window, timer_id, SYNTHETIC_CONTACT_TIMEOUT_MS, nullptr)) {
             set_contact_timer(ContactOwner::Synthetic, window, timer_id);
         } else {
@@ -68,10 +88,16 @@ namespace nativetouch::inject {
             HWND window, UINT message, WPARAM w_param, LPARAM l_param) {
         if (synthetic_touch_message != 0 && message == synthetic_touch_message) {
             POINT position { GET_X_LPARAM(l_param), GET_Y_LPARAM(l_param) };
-            if (w_param) {
-                begin_synthetic_contact(window, position);
-            } else {
+            switch (static_cast<SyntheticTouchMessage>(w_param)) {
+                case SyntheticTouchMessage::DownGameSpace:
+                    begin_synthetic_contact(window, position, false);
+                    break;
+                case SyntheticTouchMessage::DownScreenSpace:
+                    begin_synthetic_contact(window, position, true);
+                    break;
+                default:
                     end_synthetic_contact(window);
+                    break;
             }
             return true;
         }
@@ -85,20 +111,63 @@ namespace nativetouch::inject {
         return false;
     }
 
-    // inject synthetic touches; only one contact is supported at a time for simplicity
-    bool inject_synthetic_touch(POINT position, bool down) {
+    static HWND prepare_synthetic_touch() {
         initialize_touch_injection();
 
         const auto window = get_injection_window();
         if (!touch_injection_available() || window == nullptr ||
             synthetic_touch_message == 0) {
-            return false;
+            return nullptr;
+        }
+        return window;
     }
 
+    static bool post_synthetic_touch(
+            HWND window, POINT position, SyntheticTouchMessage message) {
         return PostMessageW(
             window,
             synthetic_touch_message,
-            static_cast<WPARAM>(down),
+            static_cast<WPARAM>(message),
             MAKELPARAM(position.x, position.y)) != FALSE;
     }
+
+    // inject a point expressed in the game's synthetic touch coordinate space
+    bool inject_synthetic_touch(POINT position, bool down) {
+        const auto window = prepare_synthetic_touch();
+        if (window == nullptr) {
+            return false;
+        }
+
+        const auto message = down
+            ? SyntheticTouchMessage::DownGameSpace
+            : SyntheticTouchMessage::Up;
+        return post_synthetic_touch(window, position, message);
+    }
+
+    // map a logical canvas point onto the live injection window before injecting it
+    bool inject_synthetic_touch_from_canvas(POINT position, SIZE canvas, bool down) {
+        const auto window = prepare_synthetic_touch();
+        if (window == nullptr) {
+            return false;
+        }
+
+        if (!down) {
+            return post_synthetic_touch(window, position, SyntheticTouchMessage::Up);
+        }
+
+        RECT client_rect {};
+        if (canvas.cx <= 0 || canvas.cy <= 0 ||
+                !GetClientRect(window, &client_rect) ||
+                client_rect.right <= 0 || client_rect.bottom <= 0) {
+            return false;
+        }
+
+        position.x = MulDiv(position.x, client_rect.right, canvas.cx);
+        position.y = MulDiv(position.y, client_rect.bottom, canvas.cy);
+        if (!ClientToScreen(window, &position)) {
+            return false;
+        }
+
+        return post_synthetic_touch(window, position, SyntheticTouchMessage::DownScreenSpace);
+    }
 }

src/spice2x/touch/native/nativetouchhook.cpp

@@ -23,6 +23,7 @@
 namespace nativetouch {
 
     static decltype(GetTouchInputInfo) *GetTouchInputInfo_orig = nullptr;
+    static bool native_touch_hooked = false;
     static bool native_display_initialized = false;
     static DWORD native_display_orientation = DMDO_DEFAULT;
     static long native_display_size_x = 1920L;
@@ -157,9 +158,15 @@ namespace nativetouch {
         return result;
     }
 
+    bool is_hooked() {
+        return native_touch_hooked;
+    }
+
     void hook(HMODULE module) {
         inject::hook(module);
 
+        native_touch_hooked = true;
+
         GetTouchInputInfo_orig = detour::iat_try("GetTouchInputInfo", GetTouchInputInfoHook, module);
         if (GetTouchInputInfo_orig != nullptr) {
             log_misc("touch::native", "GetTouchInputInfo hooked");

src/spice2x/touch/native/nativetouchhook.h

@@ -2,5 +2,9 @@
 
 namespace nativetouch {
     void hook(HMODULE module);
+
+    // true once hook() has installed the native touch stack for the current game;
+    // such games consume touch through the GetTouchInputInfo hook rather than spicetouch
+    bool is_hooked();
 }