Cg MISC

Color interpolation: performed by the rasterization hardware smoothly shades the interior fragments of the triangle. 

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struct C3E3f_Output 
{
  float4 color : COLOR;
};

C3E3f_Output C3E3f_texture(
float2 texCoord : TEXCOORD0, uniform sampler2D decal)
{
  C3E3f_Output OUT;
  OUT.color = tex2D(decal, texCoord);
  return OUT;
}

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Function overloading:

You could write two functions and specify that each require a particular profile.

Cg's support for profile-dependent overloading helps you isolate profile-dependent limitations in your Cg programs to helper functions.

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执行下面的routine: sincos():

void sincos(SCALAR angle, out SCALAR s, out SCALAR c);

Cg会将s和c的值替换成sin(angle)和cos(angle)

 

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Cg的in和inout机制

in参数即call-by-value，如果是同时in-out类似于call-by-reference