D3D9 Vertex Shaders

[Scharps]

Hello there,

Firstly, thank you for creating this guide. It's very hard to find information on D3D9 that's digestible by beginners.

I'm having difficulty with getting my vertex shader to transform my vertices. No matter what operation I perform, the vertex shader doesn't appear to be effected.

float4 vs_main(float4 position : POSITION) : POSITION
{
    float4 output = float4(position.x * 2, position.y * 2, 0.5f, 1.0f);
    return output;
}

I've read on FVF definitions, and ProcessVertices but I'm not sure how they should be used, if at all in this use case. Also, since I'm using Silk.NET (C# libraries providing bindings for graphics development), the definitions of FVFs aren't available.

[thedemons]

Hello, sorry for the late response.

I think the issue is your vertex shader doesn't get applied to the rendering pipeline. If I remember correctly, using D3DFVF_XYZRHW will make the rendering skips over your vertex shader because the input (vertex buffer) already transformed.