gpgx: add "Reset" and "Power" buttons

BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs

@@ -290,6 +290,11 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 		// TODO: use render and rendersound
 		public void FrameAdvance(bool render, bool rendersound = true)
 		{
+			if (Controller["Reset"])
+				LibGPGX.gpgx_reset(false);
+			if (Controller["Power"])
+				LibGPGX.gpgx_reset(true);
+
 			// do we really have to get each time?  nothing has changed
 			if (!LibGPGX.gpgx_get_control(input))
 				throw new Exception("gpgx_get_control() failed!");

BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGXControlConverter.cs

@@ -109,6 +109,9 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 
 			ControllerDef = new ControllerDefinition();
 
+			ControllerDef.BoolButtons.Add("Power");
+			ControllerDef.BoolButtons.Add("Reset");
+
 			for (int i = 0; i < LibGPGX.MAX_DEVICES; i++)
 			{
 				switch (input.dev[i])

BizHawk.Emulation.Cores/Consoles/Sega/gpgx/LibGPGX.cs

@@ -60,6 +60,8 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern void gpgx_sram_commitwrite();
 
+		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern void gpgx_reset(bool hard);
 
 		public static bool gpgx_get_control(InputData dest)
 		{

genplus-gx/cinterface/cinterface.c

@@ -417,4 +417,10 @@ GPGX_EX int gpgx_init(const char *feromextension, int (*feload_archive_cb)(const
 	return 1;
 }
 
-
+GPGX_EX void gpgx_reset(int hard)
+{
+	if (hard)
+		system_reset();
+	else
+		gen_reset(0);
+}