struct VertexOut
{
	float4 VertexPosition		:POSITION;
	float2 TexCoord				:TEXCOORD;
	float4 Position				:TEXCOORD1;
	float4 EyePosition			:TEXCOORD2;
	float2 BbSizeAngleCos		:TEXCOORD3;
	float4 LightSpacePos		:TEXCOORD4;	
	float4 Color				:COLOR0;
};


//
//  Vertex program for displaying particle system with rectangle rendertexture 
//
VertexOut VertexProgram( float4 Position :POSITION,
						float4 Texcoord: TEXCOORD,
						float4 Color:COLOR0,
						uniform float4x4 LightModelViewProj,
						uniform float3 LightPosition,
						uniform float3 EyePosition,
						uniform float4x4 ModelViewProj	:state.matrix.mvp,
						uniform float4x4 ModelViewMatrix:state.matrix.modelview
						)									
{
	VertexOut Out;	
			
	Out.Color=Color;
	
	Out.VertexPosition=mul(ModelViewProj, Position);
	Out.TexCoord=Texcoord.xy;
			
	float3 LightToPoint=normalize(Position.xyz-LightPosition);
	float3 PointToEye=normalize(EyePosition-Position.xyz); 
	Out.BbSizeAngleCos.y=(dot(LightToPoint,PointToEye)+1)/2;
		
	return Out;	
}

//
//  Fragment program for displaying particle system with rectangle rendertexture
//
void FragmentProgram(	VertexOut	In,
						uniform samplerRECT FrontTexture,
						uniform samplerRECT PhaseTexture,
						uniform float Albedo,
						uniform float Transparency,
						uniform float Symmetry,
						uniform float3 LightColor,
						float4 out Color:COLOR						
					)
{					
	float density=texRECT(FrontTexture,In.TexCoord*256).a;
	
	float phase=texRECT(PhaseTexture,float2(Symmetry,In.BbSizeAngleCos.y)*256);
	float realdens=density*Transparency;
	float outcol=realdens*phase*Albedo;
			
	Color=float4(LightColor*outcol*In.Color.rgb,1-realdens);
			
}