///////////////////////////////////////////////////////////////////////////////
//
//      ##  ######
//       ######  ###
//  ## ###############        Shark 3D Engine (www.shark3d.com)
//   ########## # # #
//    ########                Copyright (c) 1996-2006 Spinor GmbH.
//   ######### # # #          All rights reserved.
//  ##   ##########
//      ##
//
///////////////////////////////////////////////////////////////////////////////

#include \
    <levelutil/shader/prog/d3d9_hlsl/include_stddef_d3d9_hlsl.s3d_shadercode_run>

///////////////////////////////////////////////////////////////////////////////

struct VS_INPUT
{
    float4 posObj: POSITION;
    S3D_BONE_DECL_STD(boneWgh, boneSubscr)
    float3 normalObj: NORMAL;
};

struct VS_OUTPUT
{
    float4 posScr: POSITION;
};

///////////////////////////////////////////////////////////////////////////////

const float4x4 projMat;
const float4x4 matView;

S3D_MATBONE_DECL_STD(matBone)

const float4 lightCenRange;
const float4 lightExtrude;

///////////////////////////////////////////////////////////////////////////////
// Vertexshader
// Profile: 1x1

VS_OUTPUT main(VS_INPUT input)
{
    VS_OUTPUT output = (VS_OUTPUT)0;

    float4x4 matBoneFinal;
    S3D_BONE_TRANSF_STD(
            matBoneFinal, matBone, input.boneWgh, input.boneSubscr);
    // Transform vectors by matBoneFinal
    float4 posView = mul(input.posObj, matBoneFinal);
    float3 normalView = normalize(mul(input.normalObj, matBoneFinal).xyz);

    float3 effLightCenRange = lightCenRange;

#ifdef S3D_USE_BLOAT
    // Bloat:
    effLightCenRange.xyz -= normalView * lightExtrude.z;
#endif
    
    // Calculate normalized extrusion direction vector:
    float3 dirNrm = normalize(posView.xyz - effLightCenRange.xyz);

    // Extrude:
    float prod = dot(dirNrm, normalView) * lightExtrude.w;
    // Important! If the product is zero, extrusion must be off.
    float sign = (prod > 0) ? 1 : 0;
    float move = sign * lightExtrude.x + lightExtrude.y;
    posView.xyz = move * dirNrm + posView;

    // Transform:
    output.posScr = mul(posView, projMat);
    return output;
}

///////////////////////////////////////////////////////////////////////////////