// This is C6E3v_keyFrame from "The Cg Tutorial" (Addison-Wesley, ISBN
// 0321194969) by Randima Fernando and Mark J. Kilgard.  See page 159.

void C6E3v_keyFrame(float3 positionA : POSITION,
                    float3 positionB : TEXCOORD1,
                    float4 color     : COLOR,
                    float2 texCoord  : TEXCOORD0,

                out float4 oPosition : POSITION,
                out float2 oTexCoord : TEXCOORD0,
                out float4 oColor    : COLOR,

            uniform float    keyFrameBlend,
            uniform float4x4 modelViewProj)
{
  float3 position = lerp(positionA, positionB,
                         keyFrameBlend);
  oPosition = mul(modelViewProj, float4(position, 1));
  oTexCoord = texCoord;
  oColor = color;
}