Function waveUpdate

source/ui/background.c:113–144

}

void waveUpdate(void)
{
	waveDisturbance[waveDisturbancePos] = waveDisturbanceCur;

	for (u32 i = 0; i < WAVE_NUMPOINTS; i ++)
	{
		float x = (float)i / (WAVE_NUMPOINTS-1);
		float y = 120.0f;
		float dist = waveDisturbance[(waveDisturbancePos + i + 1) % WAVE_NUMPOINTS];
		for (u32 j = 0; j < WAVE_NUMCURVES; j ++)
		{
			float ampl = waveCurves[j].amplitude;
			if (j == (WAVE_NUMCURVES-1))
				ampl = dist;
			y += 0.5f*ampl * sinf(M_TAU*(waveCurves[j].velocity*x + waveCurves[j].phase));
		}
		wavePoints[i] = y;
	}

	for (u32 j = 0; j < WAVE_NUMCURVES; j ++)
	{
		float variance = randomFloatInterval(0.95f, 1.05f);
		if (j == (WAVE_NUMCURVES-1))
			variance *= waveCurves[j].velocity;
		waveCurves[j].phase += variance/60.0f;
	}

	waveDisturbancePos = (waveDisturbancePos + 1) % WAVE_NUMPOINTS;
	waveDisturbanceCur -= randomFloatInterval(0.95f, 1.05f);
	if (waveDisturbanceCur < 0.0f)
		waveDisturbanceCur = 0.0f;
}

static void bubbleUpdate(bubble_t* bubble)
{