Drawer models

gistfile1.cpp

std::queue< std::pair<int, int> * > task_queue;

void draw_pooled(int w, int h, const char *fname) {
	unsigned char *buf;

	buf = new unsigned char[w * h * 3];

	Scene::GetInstance().PrepareRender(w, h);

	bool tasks_issued = false;
	#pragma omp parallel shared(buf, tasks_issued, w, h)
	{
		#pragma omp master
		{
			for (int y = 0; y < h; ++y) {
				for (int x = 0; x < w; ++x)
					task_queue.push(new std::pair<int, int>(x, y));
			}
			tasks_issued = true;
		}

		while (true) {
			std::pair<int, int> *coords;
			#pragma omp critical(task_fetch)
			{
				if (task_queue.size() > 0) {
					coords = task_queue.front();
					task_queue.pop();
				} else
					coords = NULL;
			}

			if (coords != NULL) {
				Scene::GetInstance().RenderPixel(coords->first, coords->second,
					buf + (coords->second * w + coords->first) * 3);
				delete coords;
			} else {
				#pragma omp flush(tasks_issued)
				if (tasks_issued)
					break;
			}
		}
	}

	write_png(buf, w, h, fname);

	delete [] buf;
}

void draw_parallel_for(int w, int h, const char *fname) {
	unsigned char *buf;

	buf = new unsigned char[w * h * 3];

	Scene::GetInstance().PrepareRender(w, h);

	for (int y = 0; y < h; ++y) {
		#pragma omp parallel for
		for (int x = 0; x < w; ++x)
			Scene::GetInstance().RenderPixel(x, y, buf + (y * w + x) * 3);
	}

	write_png(buf, w, h, fname);

	delete [] buf;
}

void draw_parallel_for2(int w, int h, const char *fname) {
	unsigned char *buf;

	buf = new unsigned char[w * h * 3];

	Scene::GetInstance().PrepareRender(w, h);

	int x, y;
	#pragma omp parallel for private(x, y)
	for (int xy = 0; xy < w * h; ++xy) {
		x = xy % w;
		y = xy / w;
		Scene::GetInstance().RenderPixel(x, y, buf + (y * w + x) * 3);
	}

	write_png(buf, w, h, fname);

	delete [] buf;
}

void draw_serial(int w, int h, const char *fname) {
	unsigned char *buf;

	buf = new unsigned char[w * h * 3];

	Scene::GetInstance().PrepareRender(w, h);

	for (int y = 0; y < h; ++y) {
		for (int x = 0; x < w; ++x)
			Scene::GetInstance().RenderPixel(x, y, buf + (y * w + x) * 3);
	}

	write_png(buf, w, h, fname);

	delete [] buf;
}