一.顶点缓存和索引缓存概念

二.顶点缓存

HRESULT CreateVertexBuffer([in]           UINT Length,[in]           DWORD Usage,[in]           DWORD FVF,[in]           D3DPOOL Pool,[out, retval]  IDirect3DVertexBuffer9 **ppVertexBuffer,[in]           HANDLE *pSharedHandle);

http://msdn.microsoft.com/en-us/library/windows/desktop/bb174364(v=vs.85).aspx

如下顶点数据结构

struct Vertex
{Vertex(){}Vertex(float x, float y, float z){_x = x;     _y = y;  _z = z;}float _x, _y, _z;static const DWORD FVF;
};

然后创建一个顶点缓存

    Device->CreateVertexBuffer(3 * sizeof(Vertex), // size in bytesD3DUSAGE_WRITEONLY, // flagsVertex::FVF,        // vertex formatD3DPOOL_MANAGED,    // managed memory pool&Triangle,          // return create vertex buffer0);                 // not used - set to 0

三.向顶点缓存写数据

http://msdn.microsoft.com/en-us/library/windows/desktop/bb205915(v=vs.85).aspx

//
// Fill the buffers with the triangle data.
//Vertex* vertices;
Triangle->Lock(0, 0, (void**)&vertices, 0);vertices[0] = Vertex(-1.0f, 0.0f, 2.0f);
vertices[1] = Vertex( 0.0f, 1.0f, 2.0f);
vertices[2] = Vertex( 1.0f, 0.0f, 2.0f);Triangle->Unlock();

四.获取顶点坐标信息

/* Vertex Buffer Description */
typedef struct _D3DVERTEXBUFFER_DESC
{D3DFORMAT           Format;D3DRESOURCETYPE     Type;DWORD               Usage;D3DPOOL             Pool;UINT                Size;DWORD               FVF;} D3DVERTEXBUFFER_DESC;D3DVERTEXBUFFER_DESC desc={};
Triangle->GetDesc(&desc);

五.设置绘制状态

使用IDirect3DDevice9接口的SetRenderState方法设置

Device->SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);

比如顶点的绘制方法可以是点或填充,上面D3DFILL_WIREFRAME是以连接点来绘制

六.