正交投影的Direct2D绘图基础部分
使用正交投影的Direct2D绘图基础部分
引用：http://hi.baidu.com/shallow_sleep/blog/item/84a1c7f42f12a5d0f3d38513.html
#include <d3d9.h>
#include <d3dx9.h>
#pragma comment(lib,"d3d9")
#pragma comment(lib,"d3dx9")
IDirect3D9* _d3d9; //全局变量
_d3d9=Direct3DCreate9(D3D_SDK_VERSION);
D3DCAPS9 caps;
_d3d9->GetDeviceCaps(
D3DADAPTER_DEFAULT, //指定主显卡
D3DDEVTYPE_HAL, //指定设备内容 一般使用D3DDEVTYPE_HAL硬件加速.
&caps);
int vp=0;
if(caps.DevCaps&D3DDEVCAPS_HWTRANSFORMANDLIGHT)
{
//检测硬件是否支持变换和灯光的,如果支持，设定为用硬件（加速）处理
vp = D3DCREATE_HARDWARE_VERTEXPROCESSING;
}
else
{
//如果不是，设定为用软件处理
vp = D3DCREATE_SOFTWARE_VERTEXPROCESSING;
}
//创建设备
D3DPRESENT_PARAMETERS d3dpp;
d3dpp.BackBufferWidth = 800; //分辨率
d3dpp.BackBufferHeight = 600;
d3dpp.BackBufferFormat = D3DFMT_A8R8G8B8; //像素格式
d3dpp.BackBufferCount = 1;
d3dpp.MultiSampleType = D3DMULTISAMPLE_NONE; //抗锯齿：无
d3dpp.MultiSampleQuality = 0; //抗锯齿等级
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; //翻转方式：D3DSWAPEFFECT_DISCARD：一般用于全屏、每帧刷新；
//D3DSWAPEFFECT_FLIP：双缓冲
//D3DSWAPEFFECT_COPY：从后缓冲拷贝
//D3DSWAPEFFECT_COPY_VSYNC：从后缓冲拷贝并垂直同步，防止画面撕裂
d3dpp.hDeviceWindow = hWnd; //窗口句柄
d3dpp.Windowed = false; //是否全屏
d3dpp.EnableAutoDepthStencil = true; //是否有深度缓存和模板缓存
d3dpp.AutoDepthStencilFormat = D3DFMT_D24S8; //深度缓存和模板缓存的格式
d3dpp.Flags = 0;
d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT; //刷新频率
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
IDirect3DDevice9* device = 0;
HRESULT hr = _d3d9->CreateDevice(
D3DADAPTER_DEFAULT, // 主显卡
D3DDEVTYPE_HAL, // 设备格式：硬件加速
hWnd, // 窗口句柄
vp, // 顶点处理方式，刚测试过
&d3dpp,
&device);
if( FAILED(hr) )
{
::MessageBoxA(0, "CreateDevice() - FAILED", 0, 0);
return 0;
}
3. 恢复窗口
会在调整窗口时用到，可能还会在设备丢失时用到（不确定）。
void RestoreWindow(float w, float h)
{
//创建视口
D3DVIEWPORT9 view;
view.X = 0;
view.Y = 0;
view.Width = w;
view.Height = h;
view.MinZ = 0.0f;
view.MaxZ = 1.0f;
// 创建视口并添加到设备
if (FAILED(g_pd3dDevice->SetViewport(&view))){
MessageBoxA(0,"Failed to create a viewport",0,0);
};
D3DXMATRIX Ortho2D;
D3DXMATRIX Identity;
//2D，所以使用正交投影；3D请查D3DXMatrixPerspectiveFovLH
D3DXMatrixPerspectiveFovLH(&Ortho2D,w,h,0.0f,1.0f);
D3DXMatrixIdentity(&Identity);
g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &Ortho2D);
g_pd3dDevice->SetTransform(D3DTS_WORLD, &Identity);
g_pd3dDevice->SetTransform(D3DTS_VIEW, &Identity);
//关闭光照，否则不定义法线则为黑色
g_pd3dDevice->SetRenderState(D3DRS_LIGHTING, FALSE);
}
4. 渲染
放在WM_PAINT消息中。
void Render()
{
//清除屏幕
g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB(255,0,0,0), 1.0f, 0);
//BeginScene和EndScene必须成对出现，不能嵌套
g_pd3dDevice->BeginScene();
// render game scene here
g_pd3dDevice->EndScene();
//在后缓冲区复制最后翻转到前台显示
g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
}
