void Game::work(double dt) {
dt = fmin(dt, 1.0f);
// Clear some buffers
glClearColor(0.2353f, 0.2471f, 0.2549f, 1.0f);
checkGlError("glClearColor");
glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
checkGlError("glClear");
// Use some programs
glUseProgram(gProgram_);
checkGlError("glUseProgram");
glLineWidth(2.0f);
// Randomly generate meteors at approximate rate one per second
if ( ((float)rand() / RAND_MAX) < dt ) {
Meteor* meteor = new Meteor();
float sky = (float) width_ / (float)height_;
float x = ((float)rand() / RAND_MAX) * sky - sky / 2;
meteor->translate(x, 1.0f);
meteor->updateXSpeed();
scene_.push_back(meteor);
}
// Render scene loop
for (vector<Node*>::iterator node = scene_.begin(); node < scene_.end(); ++node) {
// Let's draw it
(*node)->draw(dt, gaPositionHandle_, gaColorHandle_, guVeiwProjHandle_, mProj_);
enum NodeType type = (*node)->getType();
// If it is a meteor than update it's position and stuff
if (type == METEOR || type == SMALL_METEOR) {
updateMeteor(dt, node);
}
// Do the same for bullet
if (type == BULLET) {
updateBullet(dt, node);
}
}
if (!deleted_.empty()) {
// Sort "deleted" array to be able remove elements in right order
sort(deleted_.begin(), deleted_.end());
// Remove duplicates
deleted_.erase( unique( deleted_.begin(), deleted_.end() ), deleted_.end() );
}
// Remove elements in backwards order
for (int i = deleted_.size() - 1; i >= 0; --i) {
int index = deleted_[i];
delete scene_[index];
scene_.erase(scene_.begin() + index);
}
// All useless elements are deleted so clear the "deleted array"
deleted_.clear();
// If flag is set than it's time to spawn small ones
// And if we hit meteor at (0, 0), well.. than it's a lucky shot
if (smallMeteorX_ || smallMeteorY_) {
for (int i = 0; i < smallMeteors; ++i) {
SmallMeteor* smallMeteor = new SmallMeteor(smallMeteorX_, smallMeteorY_);
scene_.push_back(smallMeteor);
}
// Clear the spawn flag
smallMeteorX_ = smallMeteorY_ = 0.0f;
}
}
