C++ USLuaState类代码示例

//----------------------------------------------------------------//
uintptr USLuaSerializer::Affirm ( USLuaState& state, int idx ) {

	// if we're an object, affirm as such...
	if ( state.IsType ( idx, LUA_TUSERDATA )) {
		return this->Affirm ( state.GetLuaObject < USLuaObject >( -1 ));
	}

	// bail if we're not a table
	if ( !state.IsType ( idx, LUA_TTABLE )) return 0;

	// get the table's address
	uintptr tableID = ( uintptr )lua_topointer ( state, idx );
	
	// bail if the table's already been added
	if ( this->mTableMap.contains ( tableID )) return tableID;

	// add the ref now to avoid cycles
	this->mTableMap [ tableID ].SetStrongRef ( state, idx );

	// follow the table's refs to make sure everything gets added
	u32 itr = state.PushTableItr ( idx );
	while ( state.TableItrNext ( itr )) {
		this->Affirm ( state, -1 );
	}
	
	return tableID;
}

//----------------------------------------------------------------//
u32 USLuaSerializer::WriteTableInitializer ( USStream& stream, USLuaState& state, int idx, cc8* prefix ) {

	u32 count = 0;
	u32 itr = state.PushTableItr ( idx );
	while ( state.TableItrNext ( itr )) {
		
		switch ( lua_type ( state, -2 )) {
		
			case LUA_TSTRING: {
				stream.Print ( "\t%s [ \"%s\" ] = ", prefix, lua_tostring ( state, -2 ));
				break;
			}
			case LUA_TNUMBER: {
				stream.Print ( "\t%s [ %s ]\t= ", prefix, lua_tostring ( state, -2 ));
				break;
			}
		};
		
		switch ( lua_type ( state, -1 )) {
			
			case LUA_TBOOLEAN: {
				int value = lua_toboolean ( state, -1 );
				cc8* str = ( value ) ? "true": "false";
				stream.Print ( "%s\n", str );
				break;
			}
			case LUA_TTABLE: {
				uintptr tableID = ( uintptr )lua_topointer ( state, -1 );
				if ( this->mTableMap.contains ( tableID )) {
					stream.Print ( "objects [ 0x%08X ]\n", tableID );
				}
				break;
			}
			case LUA_TSTRING: {
				STLString str = _escapeString ( lua_tostring ( state, -1 ));
				stream.Print ( "\"%s\"\n", str.c_str ());
				break;
			}
			case LUA_TNUMBER: {
				stream.Print ( "%s\n", lua_tostring ( state, -1 ));
				break;
			}
			case LUA_TUSERDATA: {
				USLuaObject* object = state.GetLuaObject < USLuaObject >( -1 );
				u32 instanceID = this->GetID ( object );
				stream.Print ( "objects [ 0x%08X ]\n", instanceID );
				break;
			}
			case LUA_TLIGHTUSERDATA: {
				stream.Print ( "%p,\n", lua_touserdata ( state, -1 ));
				break;
			}
		};
		
		++count;
	}
	
	return count;
}

//----------------------------------------------------------------//
void MOAIVertexFormat::RegisterLuaClass ( USLuaState& state ) {
	
	state.SetField ( -1, "GL_BYTE", ( u32 )GL_BYTE );
	//state.SetField ( -1, "GL_FIXED", ( u32 )GL_FIXED );
	state.SetField ( -1, "GL_FLOAT", ( u32 )GL_FLOAT );
	state.SetField ( -1, "GL_SHORT", ( u32 )GL_SHORT );
	state.SetField ( -1, "GL_UNSIGNED_BYTE", ( u32 )GL_UNSIGNED_BYTE );
	state.SetField ( -1, "GL_UNSIGNED_SHORT", ( u32 )GL_UNSIGNED_SHORT );
}

/**	@name	areaForRect
	@text	Returns the area for the specified rectangle.

	@in		number x1
	@in		number y1
	@in		number x2
	@in		number y2
	@out	number area			The calculated area.
*/
int MOAICpShape::_areaForRect ( lua_State* L ) {
	USLuaState state ( L );
	if ( !state.CheckParams ( 1, "NNNN" )) return 0;

	USMetaRect < cpFloat > rect = state.GetRect < cpFloat >( 1 );
	rect.Bless ();
	
	lua_pushnumber ( L, rect.Area ());
	return 1;
}

/**	@name	setFrameSize
	@text	Sets the amount of time it takes for one frame to pass.  This in effect can be used to set the FPS limit of the application by passing (1 / FPS).

	@in		number size			The frame size (how long in seconds it takes for one frame to be rendered).
	@out	nil
*/
int MOAISim::_setFrameSize ( lua_State* L ) {

	USLuaState state ( L );
	if ( !state.CheckParams ( 1, "N" )) return 0;
	
	MOAISim& device = MOAISim::Get ();
	device.mStep = state.GetValue < double >( 1, device.mStep );
	
	return 0;
}

/**	@name	getScale
	@text	Returns the default size of this font for use with the MOAITextbox:setTextSize function.

	@in		MOAIFont self
	@out	number size				The default point size of the font.
*/
int MOAIFont::_getScale ( lua_State* L ) {

	USLuaState state ( L );
	if ( !state.CheckParams ( 1, "U" )) return 0;
	
	MOAIFont* self = state.GetLuaObject < MOAIFont >( 1 );
	if ( !self ) return 0;
	
	lua_pushnumber ( state, self->GetScale ());
	return 1;
}

/**	@name	timeToFrames
	@text	Converts the number of time passed in seconds to frames.

	@in		number time			The number of seconds.
	@out	number frames		The equivilant number of frames for the specified number of seconds.
*/
int MOAISim::_timeToFrames ( lua_State* L ) {

	USLuaState state ( L );
	if ( !state.CheckParams ( 1, "N" )) return 0;
	
	float time = state.GetValue < float >( 1, 0.0f );
	
	MOAISim& device = MOAISim::Get ();
	lua_pushnumber ( state, time / device.mStep );
	
	return 0;
}

/**	@name	areaForCircle
	@text	Returns the area for a polygon.
	
	@in		table vertices Array containg vertex coordinate components ( t[1] = x0, t[2] = y0, t[3] = x1, t[4] = y1... )
	@out	number area
*/ 
int MOAICpShape::_areaForPolygon ( lua_State* L ) {
	USLuaState state ( L );
	if ( !state.CheckParams ( 1, "T" )) return 0;

	cpVect verts [ MAX_POLY_VERTS ];
	int numVerts = MOAICpShape::LoadVerts ( state, 1, verts, MAX_POLY_VERTS );
			
	if ( numVerts && cpPolyValidate ( verts, numVerts )) {
		cpFloat area = cpAreaForPoly ( numVerts, verts );
		area = area < 0 ? -area : area;
		lua_pushnumber ( L, area );
		return 1;
	}
	return 0;
}

/**	@name	serializeToString
	@text	Serializes the specified table or userdata to a string.  Useful for sending data to a remote server.

	@in		MOAISerializer self
	@opt	table data				The table data to serialize.
	@opt	userdata data			The userdata (object) to serialize.  You must provide either a table or userdata, but not both.
	@out	string serialized		The serialized string.
*/
int MOAISerializer::_serializeToString ( lua_State* L ) {

	USLuaState state ( L );
	if ( !state.CheckParams ( 1, "U" )) return 0;
	if ( !( state.IsType ( 1, LUA_TTABLE ) || state.IsType ( 1, LUA_TUSERDATA ))) return 0;

	USLuaSerializer serializer;
	serializer.Affirm ( state, 1 );
	serializer.AddLuaReturn ( state, 1 );
	STLString result = serializer.SerializeToString ();

	lua_pushstring ( state, result );

	return 1;
}

//----------------------------------------------------------------//
bool MOAIEventSource::PushListenerAndSelf ( u32 eventID, USLuaState& state ) {

	if ( this->mListenerTable ) {
	
		this->mListenerTable.PushRef ( state );
		if ( state.GetFieldWithType ( -1, eventID, LUA_TFUNCTION )) {
			
			lua_replace ( state, -2 );
			this->PushLuaUserdata ( state );
			return true;
		}
		state.Pop ( 1 );
	}
	return false;
}

//----------------------------------------------------------------//
void MOAIGfxQuad2D::RegisterLuaClass ( USLuaState& state ) {

	this->MOAIDeck2D::RegisterLuaClass ( state );
	
	state.SetField ( -1, "FILTER_POINT", ( u32 )GL_NEAREST );
	state.SetField ( -1, "FILTER_BILERP", ( u32 )GL_LINEAR );
}

//----------------------------------------------------------------//
void USLuaSerializer::SetRefField ( USLuaState& state, int idx, cc8* name, USLuaObject* object ) {

	if ( state.IsType ( idx, LUA_TTABLE )) {
		
		this->PushRef ( state, object );
		lua_setfield ( state, -2, name );
	}
}

/**	@name	setStyle
	@text	Sets the particulars of a given debug line style.
	
	@in		number styleID		See MOAIDebugLines class documentation for a list of styles.
	@opt	number size			Pen size (in pixels) for the style. Default value is 1.
	@opt	number r			Red component of line color. Default value is 1.
	@opt	number g			Green component of line color. Default value is 1.
	@opt	number b			Blue component of line color. Default value is 1.
	@opt	number a			Alpha component of line color. Default value is 1.
	@out	nil
*/
int MOAIDebugLines::_setStyle ( lua_State* L ) {
	
	USLuaState state ( L );
	if ( !state.CheckParams ( 1, "N" )) return 0;
	
	u32 styleID		= state.GetValue < u32 >( 1, 0 );
	u32 size		= state.GetValue < u32 >( 2, 1 );
	float r			= state.GetValue < float >( 3, 1.0f );
	float g			= state.GetValue < float >( 4, 1.0f );
	float b			= state.GetValue < float >( 5, 1.0f );
	float a			= state.GetValue < float >( 6, 1.0f );
	
	u32 color = USColor::PackRGBA ( r, g, b, a );
	
	MOAIDebugLines::Get ().SetStyle ( styleID, size, color );
	
	return 0;
}

//----------------------------------------------------------------//
void MOAIEventSource::AffirmListenerTable ( USLuaState& state ) {

	if ( !mListenerTable ) {
	
		lua_newtable ( state );
		this->mListenerTable.SetRef ( state, -1, false );
		state.Pop ( 1 );
	}
}

/**	@name	setClearColor
	@text	At the start of each frame the device will by default automatically render a background color.  Using this function you can set the background color that is drawn each frame.  If you specify no arguments to this function, then automatic redraw of the background color will be turned off (i.e. the previous render will be used as the background).

	@opt	number red			The red value of the color.
	@opt	number green		The green value of the color.
	@opt	number blue			The blue value of the color.
	@opt	number alpha		The alpha value of the color.
	@out	nil
*/
int MOAISim::_setClearColor ( lua_State* L ) {

	USLuaState state ( L );
	MOAISim& sim = MOAISim::Get ();
	
	if ( state.GetTop () == 0 ) {
		sim.mClearFlags &= ~GL_COLOR_BUFFER_BIT;
	}
	else {
		float r = state.GetValue < float >( 1, 0.0f );
		float g = state.GetValue < float >( 2, 0.0f );
		float b = state.GetValue < float >( 3, 0.0f );
		float a = state.GetValue < float >( 4, 1.0f );
		
		sim.mClearColor = USColor::PackRGBA ( r, g, b, a );
		sim.mClearFlags |= GL_COLOR_BUFFER_BIT;
	}
	return 0;
}