使用Camera的几个步骤

1.绘图前初始化Camera矩阵

2.程序运行时，根据用户动作实时更新Camera矩阵

3.绘图时先取得Camera矩阵，然后应用该矩阵绘图

4.在消息处理过程中调用Camera的消息处理函数

只有这样才能实时得到变化的Sence

下面看一下核心代码

1. 在InitD3D函数中初始化三种矩阵，world matrix, view matrix, porjection matrix，对应步骤1

Code
1 // Set world matrix
2 D3DXMATRIXA16 matWorld ;
3 D3DXMatrixTranslation( &matWorld, 0.0f, 0.0f, 0.0f) ;
4 g_Camera.SetWorldMatrix(&matWorld) ;
5
6 // Set view matrix
7 D3DXVECTOR3 vEyePt( 0.0f, 0.0f,-5.0f );
8 D3DXVECTOR3 vLookatPt( 0.0f, 0.0f, 0.0f );
9 D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f );
10 g_Camera.SetViewParams(&vEyePt, &vLookatPt, &vUpVec) ;
11
12 // Set projection matrix
13 g_Camera.SetProjParams(D3DX_PI/4, 1.0f, 1.0f, 320.0f) ;
14

2. 定义函数SetupMatrix用来设置当前矩阵，定义函数OnFrameMove，用来更新每一帧

Code
1 VOID SetupMatrix()
2 {
3     // Wrold
4     D3DXMATRIX matWorld = *g_Camera.GetWorldMatrix() ;
5     g_pd3dDevice->SetTransform(D3DTS_WORLD, &matWorld) ;
6
7     // View
8     D3DXMATRIX matView = *g_Camera.GetViewMatrix() ;
9     g_pd3dDevice->SetTransform(D3DTS_VIEW, &matView) ;
10
11     // Projection
12     D3DXMATRIX matProj = *g_Camera.GetProjMatrix() ;
13     g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );
14
15 }
16

1 void OnFrameMove()
2 {
3 // update every frame
4 g_Camera.OnFrameMove() ;
5 }
6

3. 在Render()函数中，首先调用OnFrameMove(), 更新Frame，对应步骤2，然后调用SetupMatrix()，取得当前矩阵并应用，对应步骤3

1 // Update frame
2 OnFrameMove() ;
3
4 // update matrix
5 SetupMatrix() ;
6
7

4. 在WinProc函数的最后调用camera的消息处理函数

1 g_Camera.HandleMessages(hWnd, msg, wParam, lParam) ;

完整代码

Code
  1 #include <d3dx9.h>
  2 #include "Camera.h"
  3
  4 LPDIRECT3D9         g_pD3D            = NULL;
  5 LPDIRECT3DDEVICE9    g_pd3dDevice    = NULL;
  6 ID3DXMesh*            mesh            = 0; // hold sphere
  7
  8 Camera g_Camera ;
  9
10 HRESULT InitD3D( HWND hWnd )
11 {
12     if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )
13         return E_FAIL;
14
15     D3DPRESENT_PARAMETERS d3dpp;
16     ZeroMemory( &d3dpp, sizeof(d3dpp) );
17     d3dpp.hDeviceWindow = hWnd ;
18     d3dpp.Windowed = TRUE;
19     d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
20     d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
21
22     // Create device
23     if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
24         D3DCREATE_SOFTWARE_VERTEXPROCESSING,
25         &d3dpp, &g_pd3dDevice ) ) )
26     {
27         return E_FAIL;
28     }
29
30     g_pd3dDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);
31
32     HRESULT r = D3DXCreateSphere(g_pd3dDevice, 0.5f, 20, 20, &mesh, NULL) ;
33     if(r != D3D_OK)
34         MessageBox(hWnd, L"Create Shpere failed!", L"error!", 0);
35
36     // Set world matrix
37     D3DXMATRIXA16 matWorld ;
38     D3DXMatrixTranslation( &matWorld, 0.0f, 0.0f, 0.0f) ;
39     g_Camera.SetWorldMatrix(&matWorld) ;
40
41     // Set view matrix
42     D3DXVECTOR3 vEyePt( 0.0f, 0.0f,-5.0f );
43     D3DXVECTOR3 vLookatPt( 0.0f, 0.0f, 0.0f );
44     D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f );
45     g_Camera.SetViewParams(&vEyePt, &vLookatPt, &vUpVec) ;
46
47     // Set projection matrix
48     g_Camera.SetProjParams(D3DX_PI/4, 1.0f, 1.0f, 320.0f) ;
49
50     return S_OK;
51 }
52
53 VOID Cleanup()
54 {
55     if( g_pd3dDevice != NULL)
56         g_pd3dDevice->Release();
57
58     if( g_pD3D != NULL)
59         g_pD3D->Release();
60
61     if(mesh != NULL)
62         mesh->Release() ;
63 }
64
65 VOID SetupMatrix()
66 {
67     // Wrold
68     D3DXMATRIX matWorld = *g_Camera.GetWorldMatrix() ;
69     g_pd3dDevice->SetTransform(D3DTS_WORLD, &matWorld) ;
70
71     // View
72     D3DXMATRIX matView = *g_Camera.GetViewMatrix() ;
73     g_pd3dDevice->SetTransform(D3DTS_VIEW, &matView) ;
74
75     // Projection
76     D3DXMATRIX matProj = *g_Camera.GetProjMatrix() ;
77     g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );
78
79 }
80
81 void OnFrameMove()
82 {
83     // update every frame
84     g_Camera.OnFrameMove() ;
85 }
86
87 VOID Render()
88 {
89     // Update frame
90     OnFrameMove() ;
91
92     // update matrix
93     SetupMatrix() ;
94
95     // Clear the backbuffer to a RED color
96     g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(255,255,255), 1.0f, 0 );
97
98     // Begin the scene
99     if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )
100     {
101         // Draw a shpere
102         mesh->DrawSubset(0) ;
103
104         // End the scene
105         g_pd3dDevice->EndScene();
106     }
107
108     // Present the backbuffer contents to the display
109     g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
110 }
111
112 LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
113 {
114     switch( msg )
115     {
116     case WM_KEYDOWN:
117         {
118             switch( wParam )
119             {
120             case VK_ESCAPE:
121                 SendMessage( hWnd, WM_CLOSE, 0, 0 );
122                 break ;
123             default:
124                 break ;
125             }
126         }
127         return 0 ;
128
129     case WM_DESTROY:
130         Cleanup();
131         PostQuitMessage( 0 );
132         return 0;
133     }
134
135     // handle camera message
136     g_Camera.HandleMessages(hWnd, msg, wParam, lParam) ;
137
138     return DefWindowProc( hWnd, msg, wParam, lParam );
139 }
140
141 INT WINAPI wWinMain( HINSTANCE hInst, HINSTANCE, LPWSTR, INT )
142 {
143     // Register the window class
144     WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
145         GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
146         L"D3D Tutorial", NULL };
147     RegisterClassEx( &wc );
148
149     // Create the application's window
150     HWND hWnd = CreateWindow( L"D3D Tutorial", L"D3D Tutorial 01: CreateDevice",
151         WS_OVERLAPPEDWINDOW , 0, 0, 800, 600,
152         NULL, NULL, wc.hInstance, NULL );
153
154     // Initialize Direct3D
155     if( SUCCEEDED( InitD3D( hWnd ) ) )
156     {
157         // Show the window
158         ShowWindow( hWnd, SW_SHOWDEFAULT );
159         UpdateWindow( hWnd );
160
161         MSG    msg ;
162         ZeroMemory( &msg, sizeof(msg) );
163         PeekMessage( &msg, NULL, 0U, 0U, PM_NOREMOVE );
164
165         while (msg.message != WM_QUIT)
166         {
167             if( PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE) != 0)
168             {
169                 TranslateMessage (&msg) ;
170                 DispatchMessage (&msg) ;
171             }
172             else // Render when there is no message to process
173             {
174                 Render() ;
175             }
176         }
177
178         UnregisterClass( L"D3D Tutorial", wc.hInstance );
179         return 0;
180     }
181 }

使用Camera的几个步骤相关推荐

【IoT】高通 Camera 流程及调试步骤
目录 1.Camera BringUp 前期条件 2.OTP BringUp 前期条件步骤 3.Actuator BringUp 前期条件
Camera Shading介绍
Shading阴影:包括lens shading 和 color shading Lens shading即镜头阴影,由于模组是圆形的,因此必然决定了四周的亮度相对于中心亮度偏低.此时需要通过软件的方 ...
Camera HAL3学习
转自: Camera HAL3学习 Android Camera System Android Camera硬件抽象层(HAL,Hardware Abstraction Layer)主要用于把底层ca ...
【camera专题】 Camera Open/Close (1)
系列文章基于HAL1: camera hal层框架源码系列: HAL1 – Camera Open/Close (1) 一.代码流程图整个流程就很清晰了. 二.源码及log分析 1.camera ...
GLSurfaceView camera 制作自定义相机
1. SurfaceView,GlSurfaceView,SurfaceTexture,TextureView的优缺点及区别 SurfaceView 继承自View,拥有View的大部分属性,但是由于 ...
实现 DirectShow 虚拟 Camera 驱动
今天我们要实现一个虚拟 Camera 驱动.有这个驱动,在播放软件(如 VLC).视频会议软件.主播视频制作软件(如 OBS)中,就可以播放.加入我们的各种特制内容了. 先看看实现后的效果: 在 O ...
Camera HAL3学习: Android Camera System
Android Camera硬件抽象层(HAL,Hardware Abstraction Layer)主要用于把底层camera drive与硬件和位于android.hardware中的framew ...
android 摄像头进程占用,Android 录制视频 Camera占用的解决方法
Android 录制视频 Camera占用的解决方法最近需要修改项目中的视频录制功能,原来没怎么理会,可以正常录制. 但是不录制直接返回Camera就会出现占用情况,而且连系统相机都无法正常使用了. ...
camera调试：RK3588如何点亮一个sensor？
这篇文章讲一下如何点亮一个新的sensor,以在RK3588平台,点亮IMX577为例. 目录 (1)如何才能算点亮一个sensor? (2)SENSOR_TYPE_RAW和SENSOR_TYPE_S ...
Android 新老两代 Camera API 大起底
https://blog.csdn.net/Byeweiyang/article/details/80515192 0.背景简介最近有一部分相机相关的需求,专注于对拍摄的照片.视频的噪点.色温.明暗 ...

使用Camera的几个步骤

使用Camera的几个步骤相关推荐

最新文章

热门文章