///////////////////////////////////////////////////////////////////////////////
//
//      ##  ######
//       ######  ###
//  ## ###############        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;
    float3 normalObj: NORMAL;
    float2 texCoord0: TEXCOORD0;
    float2 color: COLOR0;
};

struct VS_OUTPUT
{
    float4 posScr: POSITION;
    float2 mainTexCoord: TEXCOORD0;
    float2 texCoord0: TEXCOORD1;
    float2 texCoord1: TEXCOORD2;
    float3 diffuse: TEXCOORD3;
    float3 specular: TEXCOORD4;    
#ifdef S3D_LIGHT_PROJ
    float4 lightProjCoord: TEXCOORD5;
#endif
#ifdef S3D_LIGHT_SHMAP
    float4 lightShmapCoord: TEXCOORD6;
#endif
    float fog: FOG;
};

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

const float4x4 projMat;
const float4x4 matView;

const float4 lightCenRange;
#ifdef S3D_LIGHT_PROJ
const float4x4 lightProjMat;
#endif
#ifdef S3D_LIGHT_SHMAP
const float4x4 lightShmapMat;
#endif

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

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

    float4 posView = mul(input.posObj, matView);
    float3 normalView = mul(input.normalObj, matView).xyz;

    output.posScr = mul(posView, projMat);
    output.fog = posView.z / posView.w;

    float3 camToVertView = posView.xyz;
    float3 vertToLightView = lightCenRange - camToVertView;   
    float3 vertToLightDirView = normalize(vertToLightView);
    float3 halfDirView = vertToLightDirView - camToVertView;
    // Lightrange-factor: 1 - (lightpos - surfacepos)^2 / range^2
    float3 scaledSurfToLight = vertToLightView / lightCenRange.w;
        
    output.diffuse = clamp(dot(vertToLightDirView, input.normalObj), 0.0, 1.0) + clamp(-dot(vertToLightDirView, input.normalObj), 0.0, 1.0);
    output.specular = pow(saturate(dot(reflect(-normalize(camToVertView), input.normalObj), vertToLightDirView)), S3D_SPECULAR_EXP);

#ifdef S3D_LIGHT_PROJ
    output.lightProjCoord = mul(posView, lightProjMat);
#endif    
#ifdef S3D_LIGHT_SHMAP
    output.lightShmapCoord = mul(posView, lightShmapMat);
#endif

    output.texCoord0 = input.color.xy;
    output.texCoord1 = float2(input.texCoord0.x, 1.0 - input.texCoord0.y);

    return output;
}

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