source: GTP/branches/IllumWPdeliver2008dec/IlluminationWP/demos/Standalone/Hierarchical Systems Demo [OpenGL]/src/Psystem_Default.cg @ 3255

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 ModelViewProj  :state.matrix.mvp
                                                )                                                                       
{
        VertexOut Out;  
                        
        Out.Color=Color;
        
        Out.VertexPosition=mul(ModelViewProj, Position);
        Out.TexCoord=Texcoord.xy;
                
        return Out;     
}

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