//this is actually the core renderloop for the whole demo.
PixelArray *Scene::Render(float ftime)
{
	Timer::Update();	//Update global timer.

	//sett spole timer her:
	Timer::SetTime(ftime);

	float time = Timer::GetTime();

	//PRACHK!
	clear_zbuffer();

	for (int i=0; i<num_effects; i++)
	{
		if (effects[i]->Run(time)) //if true then draw
		{
			effects[i]->ProcessEffectChanges();

			//todo: blendmodes and overdraw stuff..
			effects[i]->Draw();	//draw each effect first

			//in each pass we overdraw the framebuffer with the chosen blendmode
			if (effects[i]->GetBlendMode() == BLENDMODE_NORMAL)
				frameBuffer.Copy(this->GetEffect(i));

			if (effects[i]->GetBlendMode() == BLENDMODE_ADDITIVE)
				frameBuffer.BlendAdd(this->GetEffect(i), this->GetEffect(i)->varBlend);

			if (effects[i]->GetBlendMode() == BLENDMODE_SUBTRACTIVE)
				frameBuffer.BlendSub(this->GetEffect(i), this->GetEffect(i)->varBlend);

			if (effects[i]->GetBlendMode() == BLENDMODE_ALPHA)
				frameBuffer.BlendAlpha(this->GetEffect(i), this->GetEffect(i)->varBlend);

			if (effects[i]->GetBlendMode() == BLENDMODE_INVERT)
				frameBuffer.Invert(&this->frameBuffer, this->GetEffect(i)->varBlend);

			if (effects[i]->GetBlendMode() == BLENDMODE_NONZERO)
				frameBuffer.CopyNonZero(this->GetEffect(i));
		}
	}
	return &frameBuffer;
}