Function SndPlayScreenCoordFx

src/sound.cpp:202–223

* Decide 'where' (between left and right speaker) to play the sound effect. * Note: Callers must determine if sound effects are enabled. This plays a sound regardless of the setting. * @param sound Sound effect to play * @param left Left edge of virtual coordinates where the sound is produced * @param right Right edge of virtual coordinates where the sound is produced * @param top Top e

 * @param bottom Bottom edge of virtual coordinates where the sound is produced
 */
static void SndPlayScreenCoordFx(SoundID sound, int left, int right, int top, int bottom)
{
	/* Iterate from back, so that main viewport is checked first */
	for (const Window *w : Window::IterateFromBack()) {
		if (w->viewport == nullptr) continue;

		const Viewport &vp = *w->viewport;
		if (left < vp.virtual_left + vp.virtual_width && right > vp.virtual_left &&
				top < vp.virtual_top + vp.virtual_height && bottom > vp.virtual_top) {
			int screen_x = (left + right) / 2 - vp.virtual_left;
			int width = (vp.virtual_width == 0 ? 1 : vp.virtual_width);
			float panning = (float)screen_x / width;

			StartSound(
				sound,
				panning,
				_vol_factor_by_zoom[to_underlying(vp.zoom)]
			);
			return;
		}
	}
}

void SndPlayTileFx(SoundID sound, TileIndex tile)
{