sgdrvsim: display or network broadcast speedometer and tachometer

Display speedometer value, or network broadcast speedo and tacho on port
8002 (slave 2) if option is set

core/hw/naomi/naomi.cpp

@@ -16,6 +16,8 @@
 #include "naomi_m3comm.h"
 #include "serialize.h"
 #include "network/output.h"
+#include "hw/sh4/modules/modules.h"
+#include "rend/gui.h"
 
 #include <algorithm>
 
@@ -776,3 +778,71 @@ void initMidiForceFeedback()
 {
 	aica::setMidiReceiver(forceFeedbackMidiReceiver);
 }
+
+struct DriveSimPipe : public SerialPipe
+{
+	void write(u8 data) override
+	{
+		if (buffer.empty() && data != 2)
+			return;
+		if (buffer.size() == 7)
+		{
+			u8 checksum = 0;
+			for (u8 b : buffer)
+				checksum += b;
+			if (checksum == data)
+			{
+				int newTacho = (buffer[2] - 1) * 100;
+				if (newTacho != tacho)
+				{
+					tacho = newTacho;
+					networkOutput.output("tachometer", tacho);
+				}
+				int newSpeed = buffer[3] - 1;
+				if (newSpeed != speed)
+				{
+					speed = newSpeed;
+					networkOutput.output("speedometer", speed);
+				}
+				if (!config::NetworkOutput)
+				{
+					char message[16];
+					sprintf(message, "Speed: %3d", speed);
+					gui_display_notification(message, 1000);
+				}
+			}
+			buffer.clear();
+		}
+		else
+		{
+			buffer.push_back(data);
+		}
+	}
+
+	int available() override {
+		return 0;
+	}
+
+	u8 read() override {
+		return 0;
+	}
+
+	void reset()
+	{
+		buffer.clear();
+		tacho = -1;
+		speed = -1;
+	}
+private:
+	std::vector<u8> buffer;
+	int tacho = -1;
+	int speed = -1;
+};
+
+void initDriveSimSerialPipe()
+{
+	static DriveSimPipe pipe;
+
+	pipe.reset();
+	serial_setPipe(&pipe);
+}

core/hw/naomi/naomi.h

@@ -28,6 +28,7 @@ extern u32 reg_dimm_parameterh;
 extern u32 reg_dimm_status;
 
 void initMidiForceFeedback();
+void initDriveSimSerialPipe();
 
 u32  libExtDevice_ReadMem_A0_006(u32 addr, u32 size);
 void libExtDevice_WriteMem_A0_006(u32 addr, u32 data, u32 size);

core/hw/naomi/naomi_cart.cpp

@@ -631,6 +631,8 @@ void naomi_cart_LoadRom(const char* file, LoadProgress *progress)
 		// Not a multiboard game but needs the same desktop environment
 		if (gameId == "SAMPLE GAME MAX LONG NAME-") // Driving Simulator
 		{
+			initDriveSimSerialPipe();
+
 			config::NetworkEnable.override(true);
 			config::ActAsServer.override(settings.naomi.drivingSimSlave == 0);
 			config::NetworkServer.override("localhost:" + std::to_string(config::LocalPort));

core/network/output.h

@@ -27,7 +27,7 @@ class NetworkOutput
 public:
 	void init()
 	{
-		if (!config::NetworkOutput || settings.naomi.slave || settings.naomi.drivingSimSlave != 0)
+		if (!config::NetworkOutput || settings.naomi.slave || settings.naomi.drivingSimSlave == 1)
 			return;
 		server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 
@@ -38,7 +38,7 @@ public:
 		socklen_t saddr_len = sizeof(saddr);
 		saddr.sin_family = AF_INET;
 		saddr.sin_addr.s_addr = INADDR_ANY;
-		saddr.sin_port = htons(8000);
+		saddr.sin_port = htons(8000 + settings.naomi.drivingSimSlave);
 		if (::bind(server, (sockaddr *)&saddr, saddr_len) < 0)
 		{
 			perror("bind");