Current Working Tree On <2023-10-15>

source/Spacewar-Client.c

@@ -79,6 +79,8 @@ int main(int argc, char ** argv)
 		{		
 			titlescreenInput = true;
 		}
+
+		// Check if Space was pressed:
 		if(keyboardState[SDL_SCANCODE_SPACE] == 1 && !runServer)
 		{		
 			runServer = true;
@@ -149,13 +151,14 @@ int main(int argc, char ** argv)
 	printf("Player Number: %u\n"
 		   "Secret Key: %u\n", playerNumber, secretKey);
 	
-	// Spawn network thread:
+	// Spawn network input thread:
 	
-	// Spawn game thread:
-	while(keepRunning)
+	// Spawn client-side-prediction thread:
+	if (!runServer)
 	{
+		pthread_t clientSidePredictionThread;
 	}
-
+	
 	// Spawn graphics thread:
 
 	return 0;

source/Spacewar-Physics.c

@@ -0,0 +1,82 @@
+// =========================================
+// | Spacewar-Physics.c                    |
+// | Copyright (C) 2023, Barra Ó Catháin   |
+// | See end of file for copyright notice. |
+// =========================================
+#include "Spacewar-Physics.h"
+
+void doPhysicsTick(SpacewarState * state)
+{
+	double gravityMagnitude, gravityAcceleration;
+	for (int shipIndex = 0; shipIndex < 32; shipIndex++)
+	{
+		SpacewarShipState * currentShip = state->playerStates[shipIndex];
+		if (currentShip->inPlay)
+		{
+			// Calculate Gravity:
+			xyVectorBetweenPoints(currentShip->position.xComponent, currentShip->position.yComponent,
+								  0, 0, currentShip.gravity);
+			gravityMagnitude = normalizeXYVector(currentShip.gravity);
+			gravityAcceleration = 0;
+
+			// Some maths that felt okay:
+			if (gravityMagnitude >= 116)
+			{
+				gravityAcceleration = pow(2, (3000 / (gravityMagnitude << 1)))) >> 3;
+			}
+			// We're actually in the black hole; teleport:
+			else
+			{
+				ship->position.xComponent = random() % 8000;
+				ship->position.yComponent = random() % 8000;
+				ship->velocity.xComponent *= 0.01;
+				ship->velocity.yComponent *= 0.01;
+			}
+		
+		 	multiplyXYVector(currentShip.gravity, gravityAcceleration);
+			
+			// Apply Inputs:
+			
+			// Apply Gravity and Velocity to Position:
+			addXYVector(currentShip.position, currentShip.gravity);
+			
+			// Wrap position to game field: 
+			if (currentShip->position.xComponent > 8000)
+			{
+				state->playerStates[shipIndex].position.xComponent = -7999;
+				state->playerStates[shipIndex].velocity.xComponent *= 0.9;
+			}
+			if (currentShip->position.xComponent < -8000)
+			{
+				state->playerStates[shipIndex].position.xComponent = 7999;
+				state->playerStates[shipIndex].velocity.xComponent *= 0.9;
+			}
+			if (currentShip->position.yComponent > 8000)
+			{
+				state->playerStates[shipIndex].position.yComponent = -7999;
+				state->playerStates[shipIndex].velocity.yComponent *= 0.9;
+			}
+			if (currentShip->position.yComponent < -8000)
+			{
+				state->playerStates[shipIndex].position.xComponent = 7999;
+				state->playerStates[shipIndex].velocity.yComponent *= 0.9;
+			}			
+		}
+	}
+}
+// ========================================================
+// | End of Spacewar-Physics.c, copyright notice follows. |
+// ========================================================
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.

source/Spacewar-Physics.h

@@ -18,12 +18,18 @@ typedef struct SpacewarShipState
 	xyVector velocity;	
 } SpacewarShipState;
 
+
+typedef struct SpacewarShipInput
+{
+	double turningAmount, acceleratingAmount;
+	bool turningClockwise, turningAnticlockwise, accelerating;
+} SpacewarShipInput;
+
 typedef struct SpacewarClientInput
 {
 	uint8_t playerNumber;
 	uint32_t secret;
-	double turningAmount, acceleratingAmount;
-	bool turningClockwise, turningAnticlockwise, accelerating;
+	SpacewarShipInput input;	
 } SpacewarClientInput;
 
 typedef struct SpacewarState
@@ -31,7 +37,7 @@ typedef struct SpacewarState
 	uint64_t tickNumber;
 	struct timeval timestamp;
 	SpacewarShipState playerStates[32];
-	SpacewarClientInput playerInputs[32];
+	SpacewarShipInput playerInputs[32]; 
 } SpacewarState;
 
 // Does a single step of the physics:

source/Spacewar-Server.c

@@ -31,40 +31,30 @@ SpacewarConnection * getConnectionBySocket(SpacewarConnection * connections, siz
 
 void * runServerPhysics(void * parameters)
 {
-	SpacewarState * state = (SpacewarState *)parameters;
+	SpacewarServerSharedState * sharedState = (SpacewarServerSharedState *)parameters;
 
 	while (true)
 	{
-		//doPhysicsTick(state);
-		//sendCurrentState();		
+//		doPhysicsTick(sharedState->physicsState);
+//		sendCurrentState(sharedState->physicsState, sharedState->connections);		
 		usleep(15625);
 	}
 
 	return NULL;
 }
 
-void * runUDPSocket(void * parameters)
+void * runInputReceiver(void * parameters)
 {
 	SpacewarServerSharedState * sharedState = (SpacewarServerSharedState *)parameters;
-	int udpSocket, bytesRead;
+	int bytesRead;
 	socklen_t socketAddressLength;
-	struct sockaddr_in clientAddress, serverAddress;
-	if ((udpSocket = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
-	{
-		exit(EXIT_FAILURE);
-	}
-
-	memset(&serverAddress, 0, sizeof(serverAddress));       
-    serverAddress.sin_family = AF_INET;
-    serverAddress.sin_port = htons(5200);
-    serverAddress.sin_addr.s_addr = INADDR_ANY;
+	struct sockaddr_in clientAddress;
 
 	SpacewarClientInput input;
-	bind(udpSocket, (struct sockaddr *)&serverAddress, sizeof(struct sockaddr_in));
 
 	while (true)
 	{
-		bytesRead = recvfrom(udpSocket, &input, sizeof(SpacewarClientInput), 0,
+		bytesRead = recvfrom(sharedState->udpSocket, &input, sizeof(SpacewarClientInput), 0,
 							 (struct sockaddr *)&clientAddress, &socketAddressLength);
 		if (bytesRead == sizeof(SpacewarClientInput))
 		{
@@ -72,10 +62,11 @@ void * runUDPSocket(void * parameters)
 			{
 				if (input.secret == sharedState->connections[input.playerNumber].playerSecret)
 				{
+					sharedState->physicsState->playerStates[input.playerNumber].inPlay = true;
 					memcpy(&sharedState->connections[input.playerNumber].clientAddress,
 						   &clientAddress, sizeof(struct sockaddr_in));
-					memcpy(&sharedState->state->playerInputs[input.playerNumber], &input,
-						   sizeof(struct SpacewarClientInput));
+					memcpy(&sharedState->physicsState->playerInputs[input.playerNumber], &(input.input),
+						   sizeof(struct SpacewarShipInput));
 				}
 			}
 		}
@@ -144,15 +135,35 @@ void * runSpacewarServer(void * configuration)
 	{
 		connectedClients[index].active = false;
 	}
+
+	// Create a UDP socket:
+	int udpSocket = 0;
+	if ((udpSocket = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
+	{
+		exit(EXIT_FAILURE);
+	}
+
+	// Create a struct to bind the UDP socket to a port:
+	struct sockaddr_in serverAddress;
+	memset(&serverAddress, 0, sizeof(serverAddress));       
+    serverAddress.sin_family = AF_INET;
+    serverAddress.sin_port = htons(5200);
+    serverAddress.sin_addr.s_addr = INADDR_ANY;
+
+	// Bind it:
+	bind(udpSocket, (struct sockaddr *)&serverAddress, sizeof(struct sockaddr_in));
 	
-	// Begin the simulation:
-	pthread_t physicsThread, udpThread;
+	// Setup the server threads:
+	pthread_t physicsThread, inputThread;
 	SpacewarState * currentState = calloc(1, sizeof(SpacewarState));
 	SpacewarServerSharedState threadState;
-	threadState.state = currentState;
+	threadState.udpSocket = udpSocket;
+	threadState.physicsState = currentState;
 	threadState.connections = connectedClients;
+
+	// Begin the simulation:
+	pthread_create(&inputThread, NULL, runInputReceiver, &threadState);
 	pthread_create(&physicsThread, NULL, runServerPhysics, &threadState);
-	pthread_create(&udpThread, NULL, runUDPSocket, &threadState);
 	
 	// Manage clients and sending packets back and forth:
 	while (true)

source/Spacewar-Server.h

@@ -32,7 +32,8 @@ typedef struct SpacewarServerConfiguration
 
 typedef struct SpacewarServerSharedState
 {
-	SpacewarState * state;
+	int udpSocket;
+	SpacewarState * physicsState;
 	SpacewarConnection * connections;
 } SpacewarServerSharedState;
 

source/xyVector.h

@@ -13,7 +13,6 @@ static inline double angleBetweenVectors(xyVector * vectorA, xyVector * vectorB)
 {
 	double dotProduct = (vectorA->xComponent * vectorB->xComponent) + (vectorA->yComponent * vectorB->yComponent);
 	double determinant = (vectorA->xComponent * vectorB->yComponent) - (vectorA->yComponent * vectorB->xComponent);
-
 	return atan2(dotProduct, determinant) / 0.01745329;
 }