void
insula::physics::world::update(
time_delta const delta)
{
contacts_.clear();
//fcppt::io::cerr << "Stepping the simulation\n";
world_->stepSimulation(
static_cast<scalar>(
delta),
// Maximum simulation substeps: The fixed time step is 1/60. We
// have to choose the substep count so that time_delta is _just_
// less than the fixed time.
3);
// 100,
// static_cast<btScalar>(1.0/240.0));
process_collisions();
}
int main(int, char**)
{
// Timing
unsigned int lastUpdate;
unsigned int thisUpdate;
unsigned int dt = 0;
// FPS
int frames = 0;
int fps = 0;
int lastFPSUpdate;
// Pixel buffer
PixelBuffer pixelBuffer(width, height);
// SDL structures
SDL_Event event;
SDL_Window* window;
SDL_Renderer* renderer;
SDL_Texture* renderTexture;
// Seed random number generator
srand((unsigned int)time(0));
// Initialise SDL
SDL_Init(SDL_INIT_EVERYTHING);
// Initilialise timing
lastUpdate = thisUpdate = SDL_GetTicks();
lastFPSUpdate = lastUpdate;
// Create window
window = createWindow(TITLE_FORMAT, width, height);
// Create renderer
renderer = createRenderer(window);
// Create render texture
renderTexture = createTexture(renderer, width, height);
// Set window values
//int width = INITIAL_WIDTH;
//int height = INITIAL_HEIGHT;
// Create and initialise managers
BallManager ballManager(width, height);
// Create some balls
ballManager.createBalls(INITIAL_BALLS);
// Start main loop
bool running = true;
bool rendering_enabled = true;
bool movement_enabled = true;
while (running)
{
const SDL_Rect screenRect = {0, 0, width, height};
// Update timer
thisUpdate = SDL_GetTicks();
dt = thisUpdate - lastUpdate;
// Handle all events
while (SDL_PollEvent(&event))
{
// End when the user closes the window or presses esc
if (event.type == SDL_QUIT ||
(event.type == SDL_KEYDOWN && event.key.keysym.scancode == SDL_SCANCODE_ESCAPE))
{
running = false;
}
// Handle keyboard input
if (event.type == SDL_KEYDOWN)
{
// Toggle rendering when player presses R
if (event.key.keysym.sym == SDLK_r)
{
// Disable rendering
rendering_enabled = !rendering_enabled;
// Clear screen to white
pixelBuffer.clear(0xFFFFFFFF);
// Update render texture
SDL_UpdateTexture(renderTexture, &screenRect, pixelBuffer.getBuffer(), width * 4);
// Render texture to screen
SDL_RenderCopy(renderer, renderTexture, &screenRect, &screenRect);
// Flip screen buffer
SDL_RenderPresent(renderer);
}
// Toggle movement when player presses M
else if (event.key.keysym.sym == SDLK_m)
{
movement_enabled = !movement_enabled;
}
// Add 10 balls when user presses right arrow
else if (event.key.keysym.scancode == SDL_SCANCODE_RIGHT)
{
ballManager.createBalls(100);
}
// Remove 10 balls when user presses left arrow
else if (event.key.keysym.scancode == SDL_SCANCODE_LEFT)
{
ballManager.destroyBalls(100);
}
}
}
// Update game
float delta = dt*GAME_SPEED;
if(movement_enabled)
{
process_collisions(width, height, ballManager.balls());
process_movement(delta, ballManager.balls());
process_gravity(delta, ballManager.balls());
}
// Clear window
SDL_RenderClear(renderer);
if (rendering_enabled)
{
// Clear buffer
pixelBuffer.clear(CLEAR_COLOUR);
// Run rendering system
process_rendering(&pixelBuffer, ballManager.balls());
// Blit buffer to screen renderer
SDL_UpdateTexture(renderTexture, &screenRect, pixelBuffer.getBuffer(), width * 4);
// Render texture to screen
SDL_RenderCopy(renderer, renderTexture, &screenRect, &screenRect);
// Flip screen buffer
SDL_RenderPresent(renderer);
}
// Update last time
lastUpdate = thisUpdate;
// Average FPS calculations
frames++;
if (thisUpdate - lastFPSUpdate >= 1000)
{
// Update FPS counters
fps = frames;
frames = 0;
lastFPSUpdate = thisUpdate;
}
// Update window title
{
const int titleBufferLen = 256;
char titleBuffer[titleBufferLen];
// Format window title
const char* renderingEnabled = (rendering_enabled ? "Enabled" : "Disabled");
const char* movementEnabled = (true ? "Enabled" : "Disabled");
snprintf(titleBuffer, titleBufferLen, TITLE_FORMAT, ballManager.ballCount(), fps, renderingEnabled, movementEnabled);
// Set window title
SDL_SetWindowTitle(window, titleBuffer);
}
}
// Clean up
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}