DX学习笔记(旋转的茶壶)DX自带几何体

本文主要讲茶壶是如何创建的，其余的内容可参考 http://blog.csdn.net/zero_witty/article/details/51637459

d3d自带的几何体可通过如下几步便可以简单完成

想要通过这几个函数快捷绘制出一个几何体，需要以下几步：（以本例程的茶壶为例）

1.定义一个ID3DXMesh接口类型的对象。

ID3DXMesh* Teapot = 0;

2.接着调用相对应的创建函数如：

D3DXCreateTeapot(Device, &Teapot, 0);
/**HRESULT  D3DXCreateTeapot(   
LPDIRECT3DDEVICE9 pDevice,  //Direct3D设备对象  
LPD3DXMESH *ppMesh, //存储着我们创建的形状的指针的地址，即为输出项
LPD3DXBUFFER *ppAdjacency  );  //它存储着我们在这里绘制的网格的三角形索引的指针//一般可不管
D3DXCreateTeapot（）可用来创建一个茶壶





3.在Direct3D渲染后，也就是在BeginScene之后直接调用DrawSubset（0）就可以进行网格图形的绘制。


Teapot->DrawSubset(0);



4.绘制完成之后，像其他一样，Release便可以。



d3d::Release(Teapot);



 teapot.cpp

#include "d3dUtility.h"

IDirect3DDevice9* Device=0;

const int Width = 640;
const int Height = 480;

ID3DXMesh* Teapot = 0;


bool Setup()
{
D3DXCreateTeapot(Device, &Teapot, 0);

D3DXVECTOR3 position(0.0f, 0.0f, -3.0f);
D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);

D3DXMATRIX V;
D3DXMatrixLookAtLH(&V, &position, &target, &up);
Device->SetTransform(D3DTS_VIEW, &V);

//设置投影矩阵
D3DXMATRIX proj;
D3DXMatrixPerspectiveFovLH(&proj, D3DX_PI*0.5f, (float)Width / (float)Height, 1.0f, 1000.0f);
Device->SetTransform(D3DTS_PROJECTION, &proj);

Device->SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);

return true;
}

void Cleanup()
{
d3d::Release(Teapot);
}

bool Display(float timeDelta)
{
if (Device)
{
D3DXMATRIX Ry;
static float y = 0.0f;
D3DXMatrixRotationY(&Ry,y);

y += timeDelta;
if (y >= 6.28f)
y = 0.0f;
Device->SetTransform(D3DTS_WORLD, &Ry);


Device->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0xffffffff, 1.0f, 0);
Device->BeginScene();

Teapot->DrawSubset(0);

Device->EndScene();
Device->Present(0, 0, 0, 0);

}
return true;
}

LRESULT CALLBACK d3d::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_DESTROY:
::PostQuitMessage(0);
break;
case WM_KEYDOWN:
if (wParam == VK_ESCAPE)
::DestroyWindow(hwnd);
break;
}
return ::DefWindowProc(hwnd, msg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE prevInstance, PSTR cmdLine, int showCmd)
{
if (!d3d::InitD3D(hinstance, Width, Height, true, D3DDEVTYPE_HAL, &Device))
{
::MessageBox(0, "InitD3D() - FAILED", 0, 0);
return 0;
}
if (!Setup())
{
::MessageBox(0, "Setup() - FAILED", 0, 0);
return 0;
}

d3d::EnterMsgLoop(Display);

Cleanup();

Device->Release();

return 0;
}