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POThe vertex structure of a mesh vs the vertex structure of the vertex shader
 

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  1. POThe vertex structure of a mesh vs the vertex structure of the vertex shader
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    <p>[Using HLSL, an *.fx file and DirectX9]</p> <p>I'm new to using shaders and have got a scenario working but don't understand why. I'm confused as to how the mesh can have one version of the vertex decleration while the shader can define another. </p> <p>I create a <code>ID3DXMesh</code> sphere with <code>D3DXCreateSphere(...)</code>, which comes setup with <code>D3DFVF_XYZ | D3DFVF_NORMAL</code>. I call <code>ID3DXMesh::DrawSubset(0)</code> to render; inside BeginPass/EndPass calls.</p> <p>I then have a vertex shader with the struct defined:</p> <pre><code>struct Vertex { float4 position:POSITION; float2 textureCoords:TEXCOORD0; float3 lightDir:TEXCOORD1; float3 normal:TEXCOORD2; }; </code></pre> <p>and the shader itself:</p> <pre><code>Vertex vertexShader( Vertex original, float3 _normal:NORMAL ) { Vertex result = (Vertex)0; float4x4 worldViewMatrix = mul( worldMatrix, viewMatrix ); float4x4 worldViewProjectionMatrix = mul( worldViewMatrix, projectionMatrix ); result.position = mul( original.position, worldViewProjectionMatrix ); result.normal = -normalize( mul(_normal, worldMatrix) ); result.textureCoords = original.textureCoords; result.lightDir = normalize(presetLightDir); return result; } </code></pre> <p>While I recognize that the lightDir and textureCoords might as well be null before I set them, what data does DirectX actually give in that <code>Vertex original</code> parameter? </p> <p>Just the position? I notice that the <code>float3 _normal:NORMAL</code> is offered as a separate parameter but is that value also inside <code>original</code> at the start of the shader too?</p>
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