source: GTP/trunk/App/Demos/Illum/Shark3D/version164x12u/IllumDemo/src/res/levelutil/shader/prog/d3d9_hlsl/lightfilter_d3d9_hlsl_vs2x0.s3d_shadercode @ 2196

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

struct VS_INPUT
{
    float4 posObj: POSITION;
    float2 screen: TEXCOORD0;
};

struct VS_OUTPUT
{
    float4 posScr: POSITION;
    float2 screen: TEXCOORD0;
    float2 scale: TEXCOORD1;
};

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

const float4x4 matProjView;
const float4 tex0RcpSize;
const float4 passInfo;

///////////////////////////////////////////////////////////////////////////////
// Vertexshader
// Profile: 2x0

VS_OUTPUT main(VS_INPUT input)
{
    VS_OUTPUT output = (VS_OUTPUT)0;
    output.posScr = mul(input.posObj, matProjView);

    // Smoothing parameters:
    // Go from wide to small to avoid artifacts in case of depth jumps.
    // Use pow(2,iter) instead of pow(3,iter), 
    // because this gives a better quality:
    float iter = passInfo.x;
    float smooth = exp2(iter);
    
    output.screen.xy = input.screen;
    output.scale.xy = tex0RcpSize * smooth;
    
    return output;
}

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