使用定点缓存进行绘制

//定义顶点结构：
struct ColorVertex
{
    ColorVertex()
    {
    }

    ColorVertex(float x, float y, float z, D3DCOLOR c)
    {
        _x = x;
        _y = y;
        _z = z;
        _color = c;
    }
    float _x, _y, _z;
    D3DCOLOR _color;

    static const DWORD FVF;
};
const DWORD ColorVertex::FVF = D3DFVF_XYZ | D3DFVF_DIFFUSE;

//声明一个顶点缓存接口
IDirect3DVertexBuffer9* triangle = 0;


//创建顶点缓存
Device->CreateVertexBuffer(
    3 * sizeof(ColorVertex),
    D3DUSAGE_WRITEONLY,
    ColorVertex::FVF,
    D3DPOOL_MANAGED,
    &triangle,
    0
    );

//访问顶点缓存内容
ColorVertex* colorVertices;
triangle->Lock(0, 0, (void**)&triangle, 0);
colorVertices[0] = ColorVertex(-1.0f, 0.0f, 2.0f, D3DCOLOR_XRGB(255, 0, 0));
colorVertices[0] = ColorVertex(0.0f, 1.0f, 2.0f, D3DCOLOR_XRGB(0, 255, 0));
colorVertices[0] = ColorVertex(1.0f, 0.0f, 2.0f, D3DCOLOR_XRGB(0, 0, 255));
triangle->Unlock();


//绘制
Device->SetFVF(ColorVertex::FVF);
Device->SetStreamSource(0, triangle, 0, sizeof(ColorVertex));
D3DXMatrixTranslation(&WorldMatrix, -1.25f, 0.0f, 0.0f);
Device->SetTransform(D3DTS_WORLD, &WorldMatrix);
Device->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_FLAT);
Device->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);