source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/treeanimation.cg @ 3041

//--------------------------------------------------------------------------------------
// Input and Output structs
//--------------------------------------------------------------------------------------


struct vtxin
{
        float4 position: POSITION;
        float3 normal: NORMAL;
        float4 color: COLOR;
        float4 texCoord: TEXCOORD0;
};

// vtx output
struct vtxout
{
        float4 position: POSITION;
        float4 texCoord: TEXCOORD0;    

        float4 color: COLOR0;  
        float4 eyePos: TEXCOORD1; // eye position
        float3 normal: TEXCOORD2;
};


//--------------------------------------------------------------------------------------
// Vertex Shaders
//--------------------------------------------------------------------------------------


vtxout animateVtx(vtxin IN,
                                  uniform float3 windDir,
                                  uniform float windStrength,
                                  uniform float frequency,
                                  uniform float2 minMaxPos,
                                  uniform float timer)
{
        vtxout OUT;

        OUT.color = float4(0);//IN.color;
        OUT.texCoord = IN.texCoord;
                
        const float pos = (minMaxPos.x - IN.position.z) / (minMaxPos.x - minMaxPos.y);

        float factor = pos * windStrength * sin(timer * frequency);

        // transform the vertex position into post projection space
        OUT.position = mul(glstate.matrix.mvp, IN.position);
        // displace the input position
        OUT.position += float4(factor * windDir, 0);

        // transform the vertex position into eye space
        OUT.eyePos = mul(glstate.matrix.modelview[0], IN.position);
        OUT.eyePos += float4(factor * windDir, 0);

        OUT.normal = IN.normal;

        return OUT;
}