LOD地形设计（六）
来源：互联网 发布：java二级考试历年真题 编辑：程序博客网 时间：2024/06/10 06:24
这一节开始把前面介绍的内容放入视图类中，完成地形的显示渲染工作。我们在视图类内设置了渲染设备，摄像机，视截体，以及地形变量。
/****************************************************************************
* Copyright Reserved by Qinge
* Filename :LODTerrainView.h
* Date :2008-1-30
****************************************************************************/
#pragma once
#include "Frustum.h"
#include "Camera.h"
#include "MyTerrain.h"
class CLODTerrainView : public CView
{
protected: // 仅从序列化创建
CLODTerrainView();
DECLARE_DYNCREATE(CLODTerrainView)
// 属性
public:
CLODTerrainDoc* GetDocument() const;
// 操作
public:
BOOL InitOpenGLSetting();
void Render();
// 重写
public:
virtual void OnDraw(CDC* pDC); // 重写以绘制该视图
virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
protected:
virtual BOOL OnPreparePrinting(CPrintInfo* pInfo);
virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);
virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);
// 实现
public:
virtual ~CLODTerrainView();
#ifdef _DEBUG
virtual void AssertValid() const;
virtual void Dump(CDumpContext& dc) const;
#endif
protected:
// 生成的消息映射函数
protected:
DECLARE_MESSAGE_MAP()
public:
afx_msg void OnSize(UINT nType, int cx, int cy);
public:
virtual void OnInitialUpdate();
private:
//显示渲染用到的成员变量
HGLRC m_hRC;
CFrustum m_Frustum;
Camera m_Camera;
CMyTerrain m_Terrain;
afx_msg void OnTimer(UINT_PTR nIDEvent);
};
#ifndef _DEBUG // LODTerrainView.cpp 中的调试版本 /**************************************************************************** #include "stdafx.h" #include "LODTerrainDoc.h" #ifdef _DEBUG // CLODTerrainView IMPLEMENT_DYNCREATE(CLODTerrainView, CView) BEGIN_MESSAGE_MAP(CLODTerrainView, CView) // CLODTerrainView 构造/析构 CLODTerrainView::CLODTerrainView() } CLODTerrainView::~CLODTerrainView() BOOL CLODTerrainView::PreCreateWindow(CREATESTRUCT& cs) return CView::PreCreateWindow(cs); // CLODTerrainView 绘制 void CLODTerrainView::OnDraw(CDC* pDC) // TODO: 在此处为本机数据添加绘制代码 // CLODTerrainView 打印 BOOL CLODTerrainView::OnPreparePrinting(CPrintInfo* pInfo) void CLODTerrainView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) void CLODTerrainView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) // CLODTerrainView 诊断 #ifdef _DEBUG void CLODTerrainView::Dump(CDumpContext& dc) const CLODTerrainDoc* CLODTerrainView::GetDocument() const // 非调试版本是内联的 // CLODTerrainView 消息处理程序 GLuint PixelFormat; // Will Hold The Selected Pixel Format CDC *m_pDC=GetDC(); // Grab A Device Context For This Window PixelFormat = ChoosePixelFormat (m_pDC->m_hDC, &pfd); // Find A Compatible Pixel Format if (SetPixelFormat (m_pDC->m_hDC , PixelFormat, &pfd) == FALSE) // Try To Set The Pixel Format m_hRC = wglCreateContext (m_pDC->m_hDC); // Try To Get A Rendering Context // Make The Rendering Context Our Current Rendering Context return TRUE; void CLODTerrainView::OnSize(UINT nType, int cx, int cy) // TODO: 在此处添加消息处理程序代码 glViewport(0,0,cx,cy); // Reset The Current Viewport glMatrixMode(GL_PROJECTION); // Select The Projection Matrix // Calculate The Aspect Ratio Of The Window glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix void CLODTerrainView::OnInitialUpdate() 到此为止，LOD地形的学习暂告一段落，所涉及内容都是最基本的，而且很大一部分不是我的原创，是从教材中抄袭而来，目的就是学习，欢迎高手给于补充、指正！
inline CLODTerrainDoc* CLODTerrainView::GetDocument() const
{ return reinterpret_cast
#endif
* Copyright Reserved by Qinge
* Filename :LODTerrainView.cpp
* Date :2008-1-30
****************************************************************************/
#include "LODTerrain.h"
#include "LODTerrainView.h"
#define new DEBUG_NEW
#endif
// 标准打印命令
ON_COMMAND(ID_FILE_PRINT, &CView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_DIRECT, &CView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_PREVIEW, &CView::OnFilePrintPreview)
ON_WM_SIZE()
ON_WM_TIMER()
END_MESSAGE_MAP()
{
// TODO: 在此处添加构造代码
{
}
{
// TODO: 在此处通过修改
// CREATESTRUCT cs 来修改窗口类或样式
}
{
CLODTerrainDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
if (!pDoc)
return;
Render();
SwapBuffers(pDC->m_hDC);
}
{
// 默认准备
return DoPreparePrinting(pInfo);
}
{
// TODO: 添加额外的打印前进行的初始化过程
}
{
// TODO: 添加打印后进行的清除过程
}
void CLODTerrainView::AssertValid() const
{
CView::AssertValid();
}
{
CView::Dump(dc);
}
{
ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CLODTerrainDoc)));
return (CLODTerrainDoc*)m_pDocument;
}
#endif //_DEBUG
BOOL CLODTerrainView::InitOpenGLSetting()
{
USES_CONVERSION;
float fogColor[3]={0.0,0.0,0.0};
static PIXELFORMATDESCRIPTOR pfd = // pfd Tells Windows How We Want Things To Be
{
sizeof (PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor
1, // Version Number
PFD_DRAW_TO_WINDOW | // Format Must Support Window
PFD_SUPPORT_OPENGL | // Format Must Support OpenGL
PFD_DOUBLEBUFFER, // Must Support Double Buffering
PFD_TYPE_RGBA, // Request An RGBA Format
16, // Select Our Color Depth
0, 0, 0, 0, 0, 0, // Color Bits Ignored
0, // No Alpha Buffer
0, // Shift Bit Ignored
0, // No Accumulation Buffer
0, 0, 0, 0, // Accumulation Bits Ignored
16, // 16Bit Z-Buffer (Depth Buffer)
0, // No Stencil Buffer
0, // No Auxiliary Buffer
PFD_MAIN_PLANE, // Main Drawing Layer
0, // Reserved
0, 0, 0 // Layer Masks Ignored
};
if (m_pDC == NULL) // Did We Get A Device Context?
{ // Destroy The Window
MessageBox(A2W("Failed to GetDC")); // Zero The Window Handle
return FALSE; // Return False
}
if (PixelFormat == 0) // Did We Find A Compatible Format?
{
// Failed
ReleaseDC(m_pDC); // Release Our Device Context
m_pDC = NULL; // Zero The Device Context
return FALSE; // Return False
}
{
// Failed
ReleaseDC(m_pDC); // Release Our Device Context
m_pDC = NULL; // Zero The Device Context
return FALSE; // Return False
}
if (m_hRC == NULL) // Did We Get A Rendering Context?
{
// Failed
ReleaseDC(m_pDC); // Release Our Device Context
m_pDC = NULL; // Zero The Device Context
return FALSE; // Return False
}
if (wglMakeCurrent (m_pDC->m_hDC, m_hRC) == FALSE)
{
// Failed
wglDeleteContext (m_hRC); // Delete The Rendering Context
m_hRC = NULL; // Zero The Rendering Context
ReleaseDC(m_pDC); // Release Our Device Context
m_pDC = NULL; // Zero The Device Context
return FALSE; // Return False
}
glShadeModel(GL_SMOOTH); // Enable Smooth Shading
glClearColor(0.4f, 0.5f, 0.8f, 0.3f); // Black Background
glClearDepth(1.0f); // Depth Buffer Setup
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations.
glEnable(GL_FOG);
glFogi(GL_FOG_MODE, GL_LINEAR); // Set the fog mode to LINEAR (Important)
glFogfv(GL_FOG_COLOR,fogColor ); // Give OpenGL our fog color
glFogf(GL_FOG_START, 0.0); // Set the start position for the depth at 0
glFogf(GL_FOG_END, 30.0);
// glEnable(GL_CULL_FACE);
// glFrontFace(GL_CCW);
// glCullFace(GL_FRONT_AND_BACK);
glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
m_Terrain.LoadRawFile("Terrain.raw");
m_Frustum.CalculateFrustum();
m_Camera.PosotionCamera(m_Terrain.m_nMapSize/2,800,m_Terrain.m_nMapSize/2,m_Terrain.m_nMapSize ,400,m_Terrain.m_nMapSize,0,1,0);
m_Terrain.SetCamera(&m_Camera);
m_Terrain.SetFrustum(&m_Frustum);
}
{
CView::OnSize(nType, cx, cy);
if (cy==0) // Prevent A Divide By Zero By
{
cy=1; // Making Height Equal One
}
glLoadIdentity(); // Reset The Projection Matrix
gluPerspective(45.0,(GLfloat)cx/(GLfloat)cy,0.1f,100000.0f);
glLoadIdentity();
}
{
CView::OnInitialUpdate();
InitOpenGLSetting();
SetTimer(1,100,NULL);
// TODO: 在此添加专用代码和/或调用基类
}
void CLODTerrainView::Render()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glPushMatrix();
// glColor3f(1.0,1.0,1.0);
m_Camera.Look();
m_Frustum.CalculateFrustum();
m_Terrain.Render();
glPopMatrix();
}
void CLODTerrainView::OnTimer(UINT_PTR nIDEvent)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
m_Camera.Update();
Invalidate(NULL);
CView::OnTimer(nIDEvent);
}
