rawinput: deal with high poll rate devices, use 3x3 for default for rb touch emu (#796)

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

## Description of change
Two changes:

1. Handle all HID events in `WM_INPUT` and not just the first one. This
only really affects 4000Hz / 8000Hz HID devices.
2. Go back to `3x3` as the default for rb IR touch emulation and remove
`1x1` as an option as it does not perform as well as I expected.

## Testing

src/spice2x/games/rb/rb.cpp

@@ -41,7 +41,7 @@ void games::rb::RBGame::attach() {
     Game::attach();
 
     if (1000 < games::rb::TOUCH_POLL_RATE) {
-        log_fatal("rb", "-rbtouchsize is set too high; cannot exceed 1000");
+        log_fatal("rb", "-rbtouchhz is set too high; cannot exceed 1000");
     }
 
     // init stuff
@@ -60,7 +60,7 @@ void games::rb::RBGame::attach() {
         log_info("rb", "force increasing touch poll rate by hooking SleepEx ({}Hz)", TOUCH_POLL_RATE);
         SleepEx_orig = detour::iat_try("SleepEx", SleepEx_hook, avs::game::DLL_INSTANCE);
     } else {
-        log_info("rb", "not changing touch poll rate (120Hz by default)");
+        log_info("rb", "not changing touch poll rate (~125Hz by default)");
     }
 }
 

src/spice2x/games/rb/rb.h

@@ -7,7 +7,6 @@
 namespace games::rb {
 
     extern uint16_t TOUCH_SCALING;
-    extern uint8_t TOUCH_SIZE;
     extern uint16_t TOUCH_POLL_RATE;
 
     class RBGame : public games::Game {

src/spice2x/games/rb/touch.cpp

@@ -14,7 +14,6 @@ static std::string WINDOW_TITLE = "REFLEC BEAT";
 
 namespace games::rb {
     uint16_t TOUCH_SCALING = 1000;
-    uint8_t TOUCH_SIZE = 1;
 }
 
 games::rb::ReflecBeatTouchDeviceHandle::ReflecBeatTouchDeviceHandle(bool log_fps) {
@@ -50,6 +49,9 @@ bool games::rb::ReflecBeatTouchDeviceHandle::open(LPCWSTR lpFileName) {
 
     if (wnd != nullptr) {
 
+        // cache the game window so read() can size against it regardless of focus
+        this->game_hwnd = wnd;
+
         // reset window process to make the game not crash
         SetWindowLongPtr(wnd, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(DefWindowProc));
 
@@ -106,8 +108,9 @@ int games::rb::ReflecBeatTouchDeviceHandle::read(LPVOID lpBuffer, DWORD nNumberO
         return 0;
     }
 
-    // get window
-    HWND window = GetForegroundWindow();
+    // size against the game window cached in open() (not GetForegroundWindow), so
+    // touch stays correctly scaled and keeps working when the game loses focus
+    HWND window = this->game_hwnd;
     if (window == nullptr) {
         return 0;
     }
@@ -166,20 +169,20 @@ int games::rb::ReflecBeatTouchDeviceHandle::read(LPVOID lpBuffer, DWORD nNumberO
         const auto point_x = (int) ((x - window_width / 2.0) * 48.0 / 54.0 + window_width / 2.0);
         const auto point_y = (int) (y - window_height / 76);
 
-        // center
-        grid_insert(data, point_x, point_y);
-
-        // surrounding points
-        if (games::rb::TOUCH_SIZE == 3) {
-            grid_insert(data, point_x - offset_x, point_y);            // west
-            grid_insert(data, point_x - offset_x, point_y - offset_y); // northwest
-            grid_insert(data, point_x - offset_x, point_y + offset_y); // southwest
-            grid_insert(data, point_x + offset_x, point_y);            // east
-            grid_insert(data, point_x + offset_x, point_y + offset_y); // southeast
-            grid_insert(data, point_x + offset_x, point_y - offset_y); // northeast
-            grid_insert(data, point_x, point_y - offset_y);            // north
-            grid_insert(data, point_x, point_y + offset_y);            // south
-        }
+        // model a finger as a 3x3 block of IR sensors around the touch point
+        // this gives better accuracy (than just 1x1) since the logic below
+        // can toggle anywhere from 1x1 to 2x2, and the game engine calculates
+        // the center point, which means by inserting up to 8 extra blocks
+        // we are emulating a sub-"pixel" resolution
+        grid_insert(data, point_x, point_y);                       // center
+        grid_insert(data, point_x - offset_x, point_y);            // west
+        grid_insert(data, point_x - offset_x, point_y - offset_y); // northwest
+        grid_insert(data, point_x - offset_x, point_y + offset_y); // southwest
+        grid_insert(data, point_x + offset_x, point_y);            // east
+        grid_insert(data, point_x + offset_x, point_y + offset_y); // southeast
+        grid_insert(data, point_x + offset_x, point_y - offset_y); // northeast
+        grid_insert(data, point_x, point_y - offset_y);            // north
+        grid_insert(data, point_x, point_y + offset_y);            // south
     }
 
     // copy data to buffer

src/spice2x/games/rb/touch.h

@@ -12,6 +12,12 @@ namespace games::rb {
         int window_width = 1080;
         int window_height = 1920;
 
+        // game window resolved in open(); read() sizes against this instead of the
+        // foreground window so touch stays correctly scaled and keeps working when
+        // the game is not the foreground window (rawinput delivers touch regardless
+        // of focus)
+        HWND game_hwnd = nullptr;
+
         // logging
         bool log_fps = false;
         uint64_t log_time = 0;