2.6 small knot
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n Use the vertex shader, we can replace the transformation and lighting phase of the fixed function line. By replacing this fixed process with our own program (vertex shader), we can achieve great freedom we can achieve in terms of graphics effects.
N vertex declaration is used to describe the vertex format. They are similar to the free vertex format, but more freedom and allow us to describe the vertex format that FVF cannot be described. Note that if the vertex can be described with an FVF, we can still use them; no matter what, they are converted to the vertex statement.
n For input, the use semantic specifies how the vertex component is mapped from the vertex declaration to the variables in the HLSL program. For output, useful semantics specifying the vertex component (for example: location, color, texture coordinates, etc.).
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