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/*====================idGameLocal::CalcFovCalculates the horizontal and vertical field of view based on a horizontal field of view and custom aspect ratio====================*/void idGameLocal::CalcFov( float base_fov, float &fov_x, float &fov_y ) const {	float	x;	float	y;	float	ratio_x;	float	ratio_y;		if ( !sys->FPU_StackIsEmpty() ) {		Printf( sys->FPU_GetState() );		Error( "idGameLocal::CalcFov: FPU stack not empty" );	}// RAVEN BEGIN// jnewquist: Option to adjust vertical fov instead of horizontal for non 4:3 modes	if ( g_fixedHorizFOV.GetBool() ) {		int aspectChoice = cvarSystem->GetCVarInteger( "r_aspectRatio" );		switch( aspectChoice ) {		default :		case 0 :			// 4:3			ratio_x = 4.0f;			ratio_y = 3.0f;			break;		case 1 :			// 16:9			ratio_x = 16.0f;			ratio_y = 9.0f;			break;		case 2 :			// 16:10			ratio_x = 16.0f;			ratio_y = 10.0f;			break;		}		x = ratio_x / idMath::Tan( base_fov / 360.0f * idMath::PI );		y = idMath::ATan( ratio_y, x );		fov_y = y * 360.0f / idMath::PI;		fov_x = base_fov;		return;	}// RAVEN END	// first, calculate the vertical fov based on a 640x480 view	x = 640.0f / idMath::Tan( base_fov / 360.0f * idMath::PI );	y = idMath::ATan( 480.0f, x );	fov_y = y * 360.0f / idMath::PI;	// FIXME: somehow, this is happening occasionally	assert( fov_y > 0 );	if ( fov_y <= 0 ) {		Printf( sys->FPU_GetState() );		Error( "idGameLocal::CalcFov: bad result" );	}	int aspectChoice = cvarSystem->GetCVarInteger( "r_aspectRatio" );	switch( aspectChoice ) {	default :	case 0 :		// 4:3		fov_x = base_fov;		return;		break;	case 1 :		// 16:9		ratio_x = 16.0f;		ratio_y = 9.0f;		break;	case 2 :		// 16:10		ratio_x = 16.0f;		ratio_y = 10.0f;		break;	}	y = ratio_y / idMath::Tan( fov_y / 360.0f * idMath::PI );	fov_x = idMath::ATan( ratio_x, y ) * 360.0f / idMath::PI;	if ( fov_x < base_fov ) {		fov_x = base_fov;		x = ratio_x / idMath::Tan( fov_x / 360.0f * idMath::PI );		fov_y = idMath::ATan( ratio_y, x ) * 360.0f / idMath::PI;	}	// FIXME: somehow, this is happening occasionally	assert( ( fov_x > 0 ) && ( fov_y > 0 ) );	if ( ( fov_y <= 0 ) || ( fov_x <= 0 ) ) {		Printf( sys->FPU_GetState() );		Error( "idGameLocal::CalcFov: bad result" );	}}