source: data/branches/Shader_HS18/programs/Cg/HW_VTFInstancing.cg @ 12216

//---------------------------------------------------------------------------
//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;
#ifdef BONE_TWO_WEIGHTS
        float4 weights          :       BLENDWEIGHT;
#endif
        float2 uv0              :       TEXCOORD0;
        float4 m03              :       TEXCOORD1; //m03.w is always 0

        float2 mOffset          :       TEXCOORD2;
        
#ifdef BONE_MATRIX_LUT
        float4 worldMatrix0     :       TEXCOORD3;
        float4 worldMatrix1     :       TEXCOORD4;
        float4 worldMatrix2     :       TEXCOORD5;
#endif
};

#include "InstancingVertexInterpolators.cg"
#ifdef ST_DUAL_QUATERNION
#include "DualQuaternionSkinning_Shadow.cg"
#endif

//---------------------------------------------
//Main Vertex Shader
//---------------------------------------------
VS_OUTPUT main_vs( in VS_INPUT input,
                                   uniform float4x4 viewProjMatrix,
                                   
#ifdef DEPTH_SHADOWCASTER
                                   uniform sampler2D matrixTexture : register(s0)
#else
                                   uniform sampler2D matrixTexture : register(s2)
#endif

#if defined( DEPTH_SHADOWCASTER ) || defined( DEPTH_SHADOWRECEIVER )
                                ,  uniform float4 depthRange
#endif
#ifdef DEPTH_SHADOWRECEIVER
                                ,  uniform float4x4 texViewProjMatrix
#endif
                                )
{
        VS_OUTPUT output;
        float4 worldPos;
        float3 worldNorm;


#ifdef ST_DUAL_QUATERNION
        float2x4 blendDQ;       
        blendDQ[0] = tex2D( matrixTexture, float2(input.m03.x, 0.0) + input.mOffset );
        blendDQ[1] = tex2D( matrixTexture, float2(input.m03.y, 0.0) + input.mOffset );
#ifdef BONE_TWO_WEIGHTS
        float2x4 blendDQ2;
        //Use the empty parts of m03, z and w, for the second dual quaternion
        blendDQ2[0] = tex2D( matrixTexture, float2(input.m03.z, 0.0) + input.mOffset );
        blendDQ2[1] = tex2D( matrixTexture, float2(input.m03.w, 0.0) + input.mOffset );
        
        //Accurate antipodality handling. For speed increase, remove the following line
        if (dot(blendDQ[0], blendDQ2[0]) < 0.0) blendDQ2 *= -1.0;
        
        //Blend the dual quaternions based on the weights
        blendDQ *= input.weights.x;
        blendDQ += input.weights.y*blendDQ2;
        //Normalize the resultant dual quaternion
        blendDQ /= length(blendDQ[0]);
#endif
        worldPos = float4(calculateBlendPosition(input.Position, blendDQ), 1.0);
        worldNorm = calculateBlendNormal(input.Normal, blendDQ);
#else
        float3x4 worldMatrix;
        worldMatrix[0] = tex2D( matrixTexture, input.m03.xw + input.mOffset );
        worldMatrix[1] = tex2D( matrixTexture, input.m03.yw + input.mOffset );
        worldMatrix[2] = tex2D( matrixTexture, input.m03.zw + input.mOffset );

        worldPos = float4( mul( worldMatrix, input.Position ).xyz, 1.0f );
        worldNorm= mul( (float3x3)(worldMatrix), input.Normal );
#endif

#ifdef BONE_MATRIX_LUT
        float3x4 worldCompMatrix;
        worldCompMatrix[0] = input.worldMatrix0;
        worldCompMatrix[1] = input.worldMatrix1;
        worldCompMatrix[2] = input.worldMatrix2;
        
        worldPos =  float4( mul( worldCompMatrix, worldPos ).xyz, 1.0f );
        worldNorm = mul( (float3x3)(worldCompMatrix), worldNorm );
        
#endif


        //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;
}