Experiment 18 in progress

- Multiplayer controls in progress
This commit is contained in:
Barra Ó Catháin 2023-03-05 21:45:24 +00:00
parent 0179459ac5
commit 004c6e9893
7 changed files with 716 additions and 0 deletions

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// SDL Experiment 17, Barra Ó Catháin.
// ===================================
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_timer.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
// A 2D vector:
typedef struct xyVector
{
double xComponent;
double yComponent;
} xyVector;
// A struct storing the needed data to draw a ship:
typedef struct ship
{
SDL_Rect rectangle;
xyVector position;
xyVector velocity;
xyVector gravity;
int number;
} ship;
// Get the angle between vectors:
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;
}
void DrawCircle(SDL_Renderer * renderer, int32_t centreX, int32_t centreY, int32_t radius)
{
const int32_t diameter = (radius * 2);
int32_t x = (radius - 1);
int32_t y = 0;
int32_t tx = 1;
int32_t ty = 1;
int32_t error = (tx - diameter);
while (x >= y)
{
// Each of the following renders an octant of the circle
SDL_RenderDrawPoint(renderer, centreX + x, centreY - y);
SDL_RenderDrawPoint(renderer, centreX + x, centreY + y);
SDL_RenderDrawPoint(renderer, centreX - x, centreY - y);
SDL_RenderDrawPoint(renderer, centreX - x, centreY + y);
SDL_RenderDrawPoint(renderer, centreX + y, centreY - x);
SDL_RenderDrawPoint(renderer, centreX + y, centreY + x);
SDL_RenderDrawPoint(renderer, centreX - y, centreY - x);
SDL_RenderDrawPoint(renderer, centreX - y, centreY + x);
if (error <= 0)
{
++y;
error += ty;
ty += 2;
}
if (error > 0)
{
--x;
tx += 2;
error += (tx - diameter);
}
}
}
int main(int argc, char ** argv)
{
SDL_Event event;
bool quit = false;
int width = 0, height = 0;
uint32_t rendererFlags = SDL_RENDERER_ACCELERATED;
uint64_t thisFrameTime = SDL_GetPerformanceCounter(), lastFrameTime = 0;
long positionX = 512, positionY = 512, starPositionX = 0, starPositionY = 0;
xyVector positionVector = {512, 512}, velocityVector = {1, 0}, gravityVector = {0, 0},
engineVector = {0.04, 0}, upVector = {0, 0.1}, starPosition = {0, 0};
// Create the socket:
int socketFileDesc = socket(AF_INET, SOCK_DGRAM, 0);
if (socketFileDesc < 0)
{
fprintf(stderr, "\tSocket Creation is:\t\033[33;40mRED.\033[0m Aborting launch.\n");
exit(0);
}
printf("\tSocket Creation is:\t\033[32;40mGREEN.\033[0m\n");
// Make the socket timeout:
struct timeval read_timeout;
read_timeout.tv_sec = 0;
read_timeout.tv_usec = 10;
setsockopt(socketFileDesc, SOL_SOCKET, SO_RCVTIMEO, &read_timeout, sizeof read_timeout);
// Create and fill the information needed to bind to the socket:
struct sockaddr_in serverAddress;
memset(&serverAddress, 0, sizeof(serverAddress));
serverAddress.sin_family = AF_INET; // IPv4
serverAddress.sin_addr.s_addr = INADDR_ANY;
serverAddress.sin_port = htons(12000);
// Bind to the socket:
if (bind(socketFileDesc, (const struct sockaddr *)&serverAddress, sizeof(serverAddress)) < 0)
{
perror("bind failed");
exit(EXIT_FAILURE);
}
// Get the initial
ship shipA;
ship shipB;
// Initialize the SDL library, video, sound, and input:
if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
{
printf("SDL Initialization Error: %s\n", SDL_GetError());
}
// Initialize image loading:
IMG_Init(IMG_INIT_PNG);
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "2");
// Create an SDL window and rendering context in that window:
SDL_Window * window = SDL_CreateWindow("SDL_TEST", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 700, 700, 0);
SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, rendererFlags);
SDL_SetWindowTitle(window, "Spacewar!");
// Load in all of our textures:
SDL_Texture * idleTexture, * acceleratingTexture, * clockwiseTexture, * anticlockwiseTexture, * currentTexture,
* acceleratingTexture2;
idleTexture = IMG_LoadTexture(renderer, "./Images/Ship-Idle.png");
clockwiseTexture = IMG_LoadTexture(renderer, "./Images/Ship-Clockwise.png");
acceleratingTexture = IMG_LoadTexture(renderer, "./Images/Ship-Accelerating.png");
anticlockwiseTexture = IMG_LoadTexture(renderer, "./Images/Ship-Anticlockwise.png");
acceleratingTexture2 = IMG_LoadTexture(renderer, "./Images/Ship-Accelerating-Frame-2.png");
// Enable resizing the window:
SDL_SetWindowResizable(window, SDL_TRUE);
ship Temp;
bool shipAUpdated, shipBUpdated;
while (!quit)
{
while(!(shipAUpdated && shipBUpdated))
{
// Receive data from the socket:
recvfrom(socketFileDesc, &Temp, sizeof(ship), 0, NULL, NULL);
if(Temp.number == 0)
{
shipA = Temp;
shipAUpdated = true;
}
if(Temp.number == 1)
{
shipB = Temp;
shipBUpdated = true;
}
}
// Check if the user wants to quit:
while (SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_QUIT:
{
quit = true;
break;
}
default:
{
break;
}
}
}
// Store the window's current width and height:
SDL_GetWindowSize(window, &width, &height);
// Set the texture to idle:
currentTexture = idleTexture;
// Calculate the position of the sprites:
shipB.rectangle.x = (width/2) - 16 - (shipB.velocity.xComponent * 15);
shipB.rectangle.y = (height/2) - 16 - (shipB.velocity.yComponent * 15);
shipA.rectangle.x = (long)((((shipA.position.xComponent - shipB.position.xComponent) - 32) + width/2) - (shipB.velocity.xComponent * 15));
shipA.rectangle.y = (long)((((shipA.position.yComponent - shipB.position.yComponent) - 32) + height/2) - (shipB.velocity.yComponent * 15));
// Set the colour to black:
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
// Clear the screen, filling it with black:
SDL_RenderClear(renderer);
// Draw the ship:
SDL_RenderCopyEx(renderer, currentTexture, NULL, &shipA.rectangle,
angleBetweenVectors(&shipA.velocity, &upVector) + 90, NULL, 0);
SDL_RenderCopyEx(renderer, currentTexture, NULL, &shipB.rectangle,
angleBetweenVectors(&shipB.velocity, &upVector) + 90, NULL, 0);
// Set the colour to yellow:
SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255);
// Draw a circle as the star:
DrawCircle(renderer, (long)(starPositionX - shipB.position.xComponent) + width/2 - (shipB.velocity.xComponent * 15),
(long)(starPositionY - shipB.position.yComponent) + height/2 - (shipB.velocity.yComponent * 15), 50);
// Present the rendered graphics:
SDL_RenderPresent(renderer);
shipAUpdated = false;
shipBUpdated = false;
}
return 0;
}
// ========================================================================================================
// Local Variables:
// compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-17-Client.c -lSDL2_image -lm -o 'Spacewar Client!'"
// End:

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// SDL Experiment 17, Barra Ó Catháin.
// ===================================
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_timer.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
// A 2D vector:
typedef struct xyVector
{
double xComponent;
double yComponent;
} xyVector;
// A struct storing the needed data to draw a ship:
typedef struct ship
{
int number;
xyVector engine;
xyVector gravity;
xyVector position;
xyVector velocity;
SDL_Rect rectangle;
} ship;
typedef struct playerController
{
int number;
int clockwiseTurn, anticlockwiseTurn, acceleratingAmount;
bool turningClockwise, turningAnticlockwise, accelerating;
} playerController;
// Calculate the vector from point A to point B:
static inline void xyVectorBetweenPoints(long ax, long ay, long bx, long by, xyVector * vector)
{
vector->xComponent = bx - ax;
vector->yComponent = by - ay;
}
// Normalize a vector, returning the magnitude:
static inline double normalizeXYVector(xyVector * vector)
{
double magnitude = sqrt(pow(vector->xComponent, 2) + pow(vector->yComponent, 2));
if(magnitude != 0)
{
vector->xComponent /= magnitude;
vector->yComponent /= magnitude;
}
return magnitude;
}
// Get the angle between vectors:
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;
}
// Rotate XY vector by a given number of degrees:
static inline void rotateXYVector(xyVector * vector, double degrees)
{
double xComponent = vector->xComponent, yComponent = vector->yComponent;
vector->xComponent = (cos(degrees * 0.01745329) * xComponent) - (sin(degrees * 0.01745329) * yComponent);
vector->yComponent = (sin(degrees * 0.01745329) * xComponent) + (cos(degrees * 0.01745329) * yComponent);
}
// Add vector B to vector A:
static inline void addXYVector(xyVector * vectorA, xyVector * vectorB)
{
vectorA->xComponent += vectorB->xComponent;
vectorA->yComponent += vectorB->yComponent;
}
// Add vector B to vector A, scaled for units per frame:
static inline void addXYVectorDeltaScaled(xyVector * vectorA, xyVector * vectorB, double deltaTime)
{
vectorA->xComponent += vectorB->xComponent * (0.001 * deltaTime) * 60;
vectorA->yComponent += vectorB->yComponent * (0.001 * deltaTime) * 60;
}
// Multiply a vector by a scalar constant:
static inline void multiplyXYVector(xyVector * vector, double scalar)
{
vector->xComponent *= scalar;
vector->yComponent *= scalar;
}
void DrawCircle(SDL_Renderer * renderer, int32_t centreX, int32_t centreY, int32_t radius)
{
const int32_t diameter = (radius * 2);
int32_t x = (radius - 1);
int32_t y = 0;
int32_t tx = 1;
int32_t ty = 1;
int32_t error = (tx - diameter);
while (x >= y)
{
// Each of the following renders an octant of the circle
SDL_RenderDrawPoint(renderer, centreX + x, centreY - y);
SDL_RenderDrawPoint(renderer, centreX + x, centreY + y);
SDL_RenderDrawPoint(renderer, centreX - x, centreY - y);
SDL_RenderDrawPoint(renderer, centreX - x, centreY + y);
SDL_RenderDrawPoint(renderer, centreX + y, centreY - x);
SDL_RenderDrawPoint(renderer, centreX + y, centreY + x);
SDL_RenderDrawPoint(renderer, centreX - y, centreY - x);
SDL_RenderDrawPoint(renderer, centreX - y, centreY + x);
if (error <= 0)
{
++y;
error += ty;
ty += 2;
}
if (error > 0)
{
--x;
tx += 2;
error += (tx - diameter);
}
}
}
void calculateGravity(xyVector * starPosition, ship * shipUnderGravity)
{
// Calculate the vector between the star and ship:
xyVectorBetweenPoints(shipUnderGravity->position.xComponent, shipUnderGravity->position.yComponent,
starPosition->xComponent, starPosition->yComponent, &shipUnderGravity->gravity);
// Make it into a unit vector:
double gravityMagnitude = normalizeXYVector(&shipUnderGravity->gravity);
double gravityAcceleration = 0;
// Calculate the gravity between the star and ship:
if(gravityMagnitude != 0)
{
if(gravityMagnitude >= 116)
{
gravityAcceleration = pow(2, (3000 / (pow(gravityMagnitude, 2)))) / 8;
}
else
{
gravityAcceleration = 1;
}
}
else
{
gravityAcceleration = 1;
}
if(gravityAcceleration < 0.01)
{
gravityAcceleration = 0.01;
}
// Scale the vector:
multiplyXYVector(&shipUnderGravity->gravity, gravityAcceleration);
}
// Create a ship with the given parameters:
ship createShip(int width, int height, double positionX, double positionY, double velocityX, double velocityY, int number)
{
ship newShip;
// Player number:
newShip.number = number;
// Rectangle to show the ship in:
newShip.rectangle.w = width;
newShip.rectangle.h = height;
// Position:
newShip.position.xComponent = positionX;
newShip.position.yComponent = positionY;
// Velocity:
newShip.velocity.xComponent = velocityX;
newShip.velocity.yComponent = velocityY;
// Gravity:
newShip.gravity.xComponent = 0;
newShip.gravity.yComponent = 0;
// Engine:
newShip.engine.yComponent = 0;
newShip.engine.xComponent = 0.1;
return newShip;
}
int main(int argc, char ** argv)
{
SDL_Event event;
int width = 0, height = 0;
uint32_t rendererFlags = SDL_RENDERER_ACCELERATED;
uint64_t thisFrameTime = SDL_GetPerformanceCounter(), lastFrameTime = 0;
long starPositionX = 0, starPositionY = 0;
double deltaTime = 0, frameAccumulator = 0;
bool quit = false, rotatingClockwise = false, rotatingAnticlockwise = false, accelerating = false;
xyVector engineVector = {0.85, 0}, upVector = {0, 0.1}, starPosition = {0, 0};
// Create the socket:
int socketFileDesc = socket(AF_INET, SOCK_DGRAM, 0);
if (socketFileDesc < 0)
{
fprintf(stderr, "\tSocket Creation is:\t\033[33;40mRED.\033[0m Aborting launch.\n");
exit(0);
}
printf("\tSocket Creation is:\t\033[32;40mGREEN.\033[0m\n");
// Create and fill the information needed to bind to the socket:
struct sockaddr_in serverAddress;
serverAddress.sin_family = AF_INET; // IPv4
serverAddress.sin_addr.s_addr = inet_addr("127.0.0.1");
serverAddress.sin_port = htons(12000);
ship shipA = createShip(32, 32, 512, 512, 1, 0, 0);
ship shipB = createShip(32, 32, -512, -512, 0, 1, 1);
// Initialize the SDL library, video, sound, and input:
if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
{
printf("SDL Initialization Error: %s\n", SDL_GetError());
}
// Check for joysticks:
SDL_Joystick * controller = NULL;
SDL_Haptic * haptic = NULL;
if (SDL_NumJoysticks() < 1 )
{
printf( "Warning: No joysticks connected!\n" );
}
else
{
// Load joystick
controller = SDL_JoystickOpen(0);
if (controller == NULL )
{
printf( "Warning: Unable to open game controller! SDL Error: %s\n", SDL_GetError() );
}
haptic = SDL_HapticOpenFromJoystick(controller);
SDL_HapticRumbleInit(haptic);
}
// Initialize image loading:
IMG_Init(IMG_INIT_PNG);
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "2");
SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");
// Create an SDL window and rendering context in that window:
SDL_Window * window = SDL_CreateWindow("SDL_TEST", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 700, 700, 0);
SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, rendererFlags);
SDL_SetWindowTitle(window, "Spacewar!");
// Load in all of our textures:
SDL_Texture * idleTexture, * acceleratingTexture, * clockwiseTexture, * anticlockwiseTexture, * currentTexture,
* acceleratingTexture2;
idleTexture = IMG_LoadTexture(renderer, "./Images/Ship-Idle.png");
clockwiseTexture = IMG_LoadTexture(renderer, "./Images/Ship-Clockwise.png");
acceleratingTexture = IMG_LoadTexture(renderer, "./Images/Ship-Accelerating.png");
anticlockwiseTexture = IMG_LoadTexture(renderer, "./Images/Ship-Anticlockwise.png");
acceleratingTexture2 = IMG_LoadTexture(renderer, "./Images/Ship-Accelerating-Frame-2.png");
// Enable resizing the window:
SDL_SetWindowResizable(window, SDL_TRUE);
while (!quit)
{
lastFrameTime = thisFrameTime;
thisFrameTime = SDL_GetPerformanceCounter();
deltaTime = (double)(((thisFrameTime - lastFrameTime) * 1000) / (double)SDL_GetPerformanceFrequency());
// Check input:
while (SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_QUIT:
{
quit = true;
break;
}
case SDL_KEYDOWN:
{
switch (event.key.keysym.sym)
{
case SDLK_LEFT:
{
shipA.turningAnticlockwise = true;
break;
}
case SDLK_RIGHT:
{
shipA.turningClockwise = true;
break;
}
case SDLK_UP:
{
shipA.accelerating = true;
break;
}
default:
{
break;
}
}
break;
}
case SDL_KEYUP:
{
switch (event.key.keysym.sym)
{
case SDLK_LEFT:
{
shipA.turningAnticlockwise = false;
break;
}
case SDLK_RIGHT:
{
shipA.turningClockwise = false;
break;
}
case SDLK_UP:
{
shipA.accelerating = false;
frameAccumulator = 0;
break;
}
default:
{
break;
}
}
break;
}
default:
{
break;
}
}
}
// Wrap the positions if the ship goes interstellar:
if(shipA.position.xComponent > 4096)
{
shipA.position.xComponent = -2000;
}
else if(shipA.position.xComponent < -4096)
{
shipA.position.xComponent = 2000;
}
if(shipA.position.yComponent > 4096)
{
shipA.position.yComponent = -2000;
}
else if(shipA.position.yComponent < -4096)
{
shipA.position.yComponent = 2000;
}
if(shipB.position.xComponent > 4096)
{
shipB.position.xComponent = -2000;
shipB.velocity.xComponent *= 0.9;
}
else if(shipB.position.xComponent < -4096)
{
shipB.position.xComponent = 2000;
shipB.velocity.xComponent *= 0.9;
}
if(shipB.position.yComponent > 4096)
{
shipB.position.yComponent = -2000;
shipB.velocity.yComponent *= 0.9;
}
else if(shipB.position.yComponent < -4096)
{
shipB.position.yComponent = 2000;
shipB.velocity.yComponent *= 0.9;
}
// Store the window's current width and height:
SDL_GetWindowSize(window, &width, &height);
// Calculate the gravity for the ships:
calculateGravity(&starPosition, &shipA);
calculateGravity(&starPosition, &shipB);
// Set the texture to idle:
currentTexture = idleTexture;
// Rotate the engine vector if needed:
if (shipA.turningClockwise)
{
rotateXYVector(&shipA.engine, 0.25 * deltaTime);
currentTexture = clockwiseTexture;
}
if (shipA.turningAnticlockwise)
{
rotateXYVector(&shipA.engine, -0.25 * deltaTime);
currentTexture = anticlockwiseTexture;
}
// Calculate the new current velocity:
addXYVectorDeltaScaled(&shipA.velocity, &shipA.gravity, deltaTime);
addXYVectorDeltaScaled(&shipB.velocity, &shipB.gravity, deltaTime);
if (shipA.accelerating)
{
addXYVectorDeltaScaled(&shipA.velocity, &shipA.engine, deltaTime);
frameAccumulator += deltaTime;
currentTexture = acceleratingTexture;
if((long)frameAccumulator % 4)
{
currentTexture = acceleratingTexture2;
}
}
// Calculate the new position:
addXYVectorDeltaScaled(&shipA.position, &shipA.velocity, deltaTime);
addXYVectorDeltaScaled(&shipB.position, &shipB.velocity, deltaTime);
// Calculate the position of the sprites:
shipA.rectangle.x = (width/2) - 16 - (shipA.velocity.xComponent * 15);
shipA.rectangle.y = (height/2) - 16 - (shipA.velocity.yComponent * 15);
shipB.rectangle.x = (long)((((shipB.position.xComponent - shipA.position.xComponent) - 32) + width/2) - (shipA.velocity.xComponent * 15));
shipB.rectangle.y = (long)((((shipB.position.yComponent - shipA.position.yComponent) - 32) + height/2) - (shipA.velocity.yComponent * 15));
// Set the colour to black:
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
// Clear the screen, filling it with black:
SDL_RenderClear(renderer);
// Draw the ship:
SDL_RenderCopyEx(renderer, currentTexture, NULL, &shipA.rectangle,
angleBetweenVectors(&shipA.engine, &upVector) + 90, NULL, 0);
SDL_RenderCopyEx(renderer, currentTexture, NULL, &shipB.rectangle,
angleBetweenVectors(&shipB.velocity, &upVector) + 90, NULL, 0);
// Set the colour to yellow:
SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255);
// Draw a circle as the star:
DrawCircle(renderer, (long)(starPositionX - shipA.position.xComponent) + width/2 - (shipA.velocity.xComponent * 15),
(long)(starPositionY - shipA.position.yComponent) + height/2 - (shipA.velocity.yComponent * 15), 50);
// Draw a line representing the velocity:
SDL_RenderDrawLine(renderer, width/2 - (shipA.velocity.xComponent * 15),
height/2 - (shipA.velocity.yComponent * 15),
(long)((width/2) + shipA.velocity.xComponent * 15) - (shipA.velocity.xComponent * 15),
(long)((height/2) + shipA.velocity.yComponent * 15) - (shipA.velocity.yComponent * 15));
// Set the colour to blue:
SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
// Draw a line representing the direction of the star:
normalizeXYVector(&shipA.gravity);
multiplyXYVector(&shipA.gravity, 100);
SDL_RenderDrawLine(renderer,
width/2 - (shipA.velocity.xComponent * 15),
height/2 - (shipA.velocity.yComponent * 15),
(width/2 - (shipA.velocity.xComponent * 15)) + shipA.gravity.xComponent,
((height/2) - (shipA.velocity.yComponent * 15)) + shipA.gravity.yComponent);
// Present the rendered graphics:
SDL_RenderPresent(renderer);
sendto(socketFileDesc, &shipA, sizeof(ship), 0, (const struct sockaddr *)&serverAddress, sizeof(serverAddress));
sendto(socketFileDesc, &shipB, sizeof(ship), 0, (const struct sockaddr *)&serverAddress, sizeof(serverAddress));
}
return 0;
}
// ========================================================================================================
// Local Variables:
// compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-17.c -lSDL2_image -lm -o 'Spacewar!'"
// End: