source: data/data_extern/programs/Cg/HWBasicInstancing.cg

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

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

        float4 mat14    :       TEXCOORD1;
        float4 mat24    :       TEXCOORD2;
        float4 mat34    :       TEXCOORD3;
};

#include "InstancingVertexInterpolators.cg"

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

#if defined( DEPTH_SHADOWCASTER ) || defined( DEPTH_SHADOWRECEIVER )
                                ,  uniform float4 depthRange
#endif
#ifdef DEPTH_SHADOWRECEIVER
                                ,  uniform float4x4 texViewProjMatrix
#endif
                                )
{
        VS_OUTPUT output;

        float3x4 worldMatrix;
        worldMatrix[0] = input.mat14;
        worldMatrix[1] = input.mat24;
        worldMatrix[2] = input.mat34;

        float4 worldPos = float4( mul( worldMatrix, input.Position ).xyz, 1.0f );
        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        = normalize(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;
}