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

struct VertexOut
{
        float4 VertexPosition           :POSITION;
        float2 TexCoord                         :TEXCOORD;
        float4 Color                            :COLOR0;
};


/*
  Vertex program for displaying particle system with rectangle rendertexture 
*/
VertexOut VertexProgram( float4 Position :POSITION,
                                                float4 Texcoord: TEXCOORD,
                                                float4 Color:COLOR0,
                                                float3 BillboardSize: NORMAL,
                                                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 sampler2D Texture
                                                ,out float4 Color:COLOR
                                                )
{
        
        Color=float4(0,0,0,tex2D(Texture,In.TexCoord).r*0.17*In.Color.a);       
                
}