source: data/branches/Shader_HS18/programs/Cg/InstancingMisc.cg

//---------------------------------------------------------------------------
//These materials/shaders are part of the NEW InstanceManager implementation
//Written by Matias N. Goldberg ("dark_sylinc")
//---------------------------------------------------------------------------

//This shader is not instancing related, but is used in the Instancing tests for lighting
//consistency (i.e. the ground)

//---------------------------------------------
//Vertex Shader Input
//---------------------------------------------
struct VS_INPUT
{
        float4 Position :       POSITION;
        float3 Normal   :       NORMAL;
        float2 uv0              :       TEXCOORD0;
};

#include "InstancingVertexInterpolators.cg"

//---------------------------------------------
//Main Vertex Shader
//---------------------------------------------
VS_OUTPUT main_vs( in VS_INPUT input,
                                   uniform float4x4 viewProjMatrix,
                                   uniform float4x4 worldMatrix

#if defined( DEPTH_SHADOWCASTER ) || defined( DEPTH_SHADOWRECEIVER )
                                ,  uniform float4 depthRange
#endif
#ifdef DEPTH_SHADOWRECEIVER
                                ,  uniform float4x4 texViewProjMatrix
#endif
                                   )
{
        VS_OUTPUT output;
        
        float4 worldPos  = mul( worldMatrix, input.Position );
        float3 worldNorm = mul( (float3x3)(worldMatrix), input.Normal );

        //Transform the position
        output.Position         = mul( viewProjMatrix, worldPos );
        
#ifdef DEPTH_SHADOWCASTER
        output.ps.unused        = float3( 0 );
        output.ps.depth         = (output.Position.z - depthRange.x + SHADOW_BIAS) * depthRange.w;
#else
        output.ps.uv0           = input.uv0;
        
        //Pass Normal and position for Blinn Phong lighting
        output.ps.Normal        = worldNorm;
        output.ps.vPos          = worldPos.xyz;

        #ifdef DEPTH_SHADOWRECEIVER
                // Calculate the position of vertex in light space to do shadows
                output.ps.lightSpacePos = mul( texViewProjMatrix, worldPos );
                // make linear
                output.ps.lightSpacePos.z = (output.ps.lightSpacePos.z - depthRange.x) * depthRange.w;
        #endif
#endif

        return output;
}