Flexible Vertex Formats and Vertex Shaders

Article
06/30/2006

Microsoft® Direct3D® for Windows CE has a simplified programming model for using the fixed function vertex processing pipeline with a single input stream. The current vertex shader is set by passing it a flexible vertex format (FVF) code.

Setting an FVF code as the current vertex shader causes the vertex processing to load from stream zero only, and to interpret the vertex elements as defined in the FVF code.

The following code example illustrates how to use an FVF code as a vertex shader in your C++ application.

First, define a structure for your custom vertex type and initialize the vertices. In this case, three vertices are initialized for rendering a triangle.

// This code example assumes that d3dDevice is a
// valid pointer to an IDirect3DDevice8 interface.

struct CUSTOMVERTEX
{
    FLOAT x, y, z, rhw; // The transformed position for the vertex
    DWORD color;        // The vertex color
};

#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZRHW|D3DFVF_DIFFUSE)

CUSTOMVERTEX g_Vertices[] =
{
    { 150.0f,  50.0f, 0.5f, 1.0f, 0xffff0000, }, // x, y, z, rhw, color
    { 250.0f, 250.0f, 0.5f, 1.0f, 0xff00ff00, },
    {  50.0f, 250.0f, 0.5f, 1.0f, 0xff00ffff, },
};

Then, render the primitive using stream zero.

d3dDevice->SetStreamSource( 0, g_pVB, sizeof(CUSTOMVERTEX) );
d3dDevice->SetVertexShader( D3DFVF_CUSTOMVERTEX );
d3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST, 0, 1 );

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Flexible Vertex Formats and Vertex Shaders

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