public FragmentInput VS(VertexInput input)
{
SN.Vector4 worldPos = SMath.Mul(World, new SN.Vector4(input.Position, 1));
SN.Vector4 worldNorm = SMath.Mul(World, new SN.Vector4(input.Normal, 0));
FragmentInput output;
output.SystemPosition = SMath.Mul(WorldViewProjection, new SN.Vector4(input.Position, 1));
output.PositionWS = new SN.Vector3(worldPos.X, worldPos.Y, worldPos.Z);
output.NormalWS = new SN.Vector3(worldNorm.X, worldNorm.Y, worldNorm.Z);
output.TexCoords = input.TexCoords;
return(output);
}
public SN.Vector4 FS(FragmentInput input)
{
SN.Vector3 normalWS = SN.Vector3.Normalize(input.NormalWS);
if (!SMath.IsFrontFace)
{
normalWS = SN.Vector3.Negate(normalWS);
}
SN.Vector3 v = SN.Vector3.Normalize(CameraPosition - input.PositionWS);
SN.Vector3 L = SN.Vector3.Normalize(LightPosition - input.PositionWS);
float nDotL = SMath.Saturate(SN.Vector3.Dot(normalWS, L));
return(SMath.Sample(DiffuseTexture, DiffuseSampler, input.TexCoords) * DiffuseColor * nDotL);
}