windows.gaming.input: Implement IForceFeedbackEffect_(get|put)_Gain.

dlls/dinput/tests/force_feedback.c

@@ -5572,7 +5572,7 @@ static void test_windows_gaming_input(void)
             .code = IOCTL_HID_WRITE_REPORT,
             .report_id = 3,
             .report_len = 18,
-            .report_buf = {3,0x01,0x04,0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0x5a,0x00,0x00,0x00},
+            .report_buf = {3,0x01,0x04,0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0x7f,0x5a,0x00,0x00,0x00},
             .wine_only = TRUE,
             .todo = TRUE,
         },
@@ -6061,12 +6061,9 @@ static void test_windows_gaming_input(void)
 
     gain = 12345.6;
     hr = IForceFeedbackEffect_get_Gain( effect, &gain );
-    todo_wine
     ok( hr == S_OK, "get_Gain returned %#lx\n", hr );
-    todo_wine
     ok( gain == 1.0, "got gain %f\n", gain );
     hr = IForceFeedbackEffect_put_Gain( effect, 0.5 );
-    todo_wine
     ok( hr == S_FALSE, "put_Gain returned %#lx\n", hr );
     state = 0xdeadbeef;
     hr = IForceFeedbackEffect_get_State( effect, &state );
@@ -6317,12 +6314,9 @@ static void test_windows_gaming_input(void)
 
     gain = 12345.6;
     hr = IForceFeedbackEffect_get_Gain( effect, &gain );
-    todo_wine
     ok( hr == S_OK, "get_Gain returned %#lx\n", hr );
-    todo_wine
     ok( gain == 1.0, "get_MasterGain returned %f\n", gain );
     hr = IForceFeedbackEffect_put_Gain( effect, 0.5 );
-    todo_wine
     ok( hr == S_FALSE, "put_Gain returned %#lx\n", hr );
     state = 0xdeadbeef;
     hr = IForceFeedbackEffect_get_State( effect, &state );

dlls/windows.gaming.input/force_feedback.c

@@ -19,6 +19,8 @@
 
 #include "private.h"
 
+#include "math.h"
+
 #include "ddk/hidsdi.h"
 #include "dinput.h"
 #include "hidusage.h"
@@ -117,14 +119,31 @@ DEFINE_IINSPECTABLE_OUTER( effect, IForceFeedbackEffect, struct effect, IInspect
 
 static HRESULT WINAPI effect_get_Gain( IForceFeedbackEffect *iface, DOUBLE *value )
 {
-    FIXME( "iface %p, value %p stub!\n", iface, value );
-    return E_NOTIMPL;
+    struct effect *impl = impl_from_IForceFeedbackEffect( iface );
+
+    TRACE( "iface %p, value %p.\n", iface, value );
+
+    EnterCriticalSection( &impl->cs );
+    *value = impl->params.dwGain / 10000.;
+    LeaveCriticalSection( &impl->cs );
+
+    return S_OK;
 }
 
 static HRESULT WINAPI effect_put_Gain( IForceFeedbackEffect *iface, DOUBLE value )
 {
-    FIXME( "iface %p, value %f stub!\n", iface, value );
-    return E_NOTIMPL;
+    struct effect *impl = impl_from_IForceFeedbackEffect( iface );
+    HRESULT hr;
+
+    TRACE( "iface %p, value %f.\n", iface, value );
+
+    EnterCriticalSection( &impl->cs );
+    impl->params.dwGain = round( value * 10000 );
+    if (!impl->effect) hr = S_FALSE;
+    else hr = IDirectInputEffect_SetParameters( impl->effect, &impl->params, DIEP_GAIN );
+    LeaveCriticalSection( &impl->cs );
+
+    return hr;
 }
 
 static HRESULT WINAPI effect_get_State( IForceFeedbackEffect *iface, ForceFeedbackEffectState *value )