Time for action – Vertex Shader Input and Output definition

1. 1. Modify the declaration for the VertexShaderInput struct by adding an entry for a texture coordinate. The new struct should be as follows:

   struct VertexShaderInput
   {
       float4 Position : POSITION0;
       float2 TextureCoordinate : TEXCOORD0;
   };

2. 2. Similarly, modify the declaration for the VertexShaderOutput function in the same way:

   struct VertexShaderOutput
   {
       float4 Position : POSITION0;
       float2 TextureCoordinate : TEXCOORD0;
   };

What just happened?

The VertexShaderInput structure is passed to our vertex shader function, which we will be modifying in the next section. The return value of the vertex shader is a VertexShaderOutput structure. This is similar to what we would do with C# to define the type of data we are passing into a function and specifying what type of information it returns.

The default shader code already has the Position field, which is declared as a float4. Once again, thinking back to our discussion on matrices...