qt4与opengl写的3维地形漫游程序

// 学程序编游戏系列丛书 // 唐明理 E_mail: cqtmL@163.com //==================================================================== // 学程序编游戏系列丛书 // 唐明理 E_mail: cqtmL@163.com //==================================================================== #include <QtOpenGL> #include <QGLContext> #include <QPixmap> #include <QGLFormat> #include "baiscobj.h" #include "BITMAP.H" #include "mygl.h" #define GL_CLAMP_TO_EDGE 0x812F // 保存天空纹理 GLfloat r; //飞机盘旋角度，主定义在OpenGL类 float gao=1.8f; ////////////////////////////////////////////////////////////////////// baiscobj::baiscobj(Mygl *mygl) { pmygl = mygl; g_eye[0]= MAP;// g_eye[2]=-MAP;// g_Angle=0;// g_elev=-0;//360;// //////////////////////////////////////////////////////////////////////// char appdir[256]; //GetCurrentDirectory(256,appdir); //CString dir=appdir; // if(dir.Right(8)!="运行程序") // SetCurrentDirectory("../运行程序"); //////////////////////////////////////////////////////////////////////// g_imageData = LoadBit("data/images/Terrain1.bmp",&g_bit); //调等高地形图 LoadT8("data/images/sand0.bmp", g_cactus[0]); //地面帖图 LoadT8("data/images/2RBack.bmp",g_cactus[2]); //天空贴图后 LoadT8("data/images/2Front.bmp",g_cactus[3]); //天空贴图前 LoadT8("data/images/2Top.bmp", g_cactus[4]); //天空贴图顶 LoadT8("data/images/2Left.bmp", g_cactus[5]); //天空贴图左 LoadT8("data/images/2Right.bmp",g_cactus[6]); //天空贴图右 InitTerrain(5);//初始化地面 glEnable(GL_TEXTURE_2D); } baiscobj::~baiscobj() { for(int i=0;i<16;i++) glDeleteTextures(1, &g_cactus[i]); glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_TEXTURE_COORD_ARRAY); } //场景=========================================================== void baiscobj::light0() { GLfloat light_position[] = {1.0,5.0,1.0,1.0}; glLightfv(GL_LIGHT0, GL_POSITION, light_position); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); glEnable(GL_COLOR_MATERIAL); } BOOL baiscobj::DisplayScene(int nkey)//摄像漫游 { float speed=0.5f; //步长 float x=g_eye[0],y=g_eye[2],z=g_eye[2]; if (nkey == key_shift) speed =speed*2;//按SHIFT时的加速true if (nkey == key_left) g_Angle-=speed*2;//左转,方位角- if (nkey == key_right) g_Angle+=speed*2;//右转,方位角+ rad_xz = float (3.13149* g_Angle/180.0f); //计算左右旋转角度 if (nkey == key_pageup) g_elev +=speed; //Page UP 键 if (nkey == key_pagedown) g_elev -=speed; //Page Down键 if (g_elev<-360) g_elev =-360; //仰俯角 if (g_elev> 360) g_elev = 360; //仰俯角 if (nkey == key_up) //前进 { g_eye[2]+=(float)sin(rad_xz)*speed; //视点的x分量 g_eye[0]+=(float)cos(rad_xz)*speed; //视点的Z分量 } if (nkey == key_down) //后退 { g_eye[2]-=(float)sin(rad_xz)*speed; //视点的x分量 g_eye[0]-=(float)cos(rad_xz)*speed; //视点的Z分量 } //控制到摄像机不离开地面 if(g_eye[0]< MAP_SCALE) g_eye[0]= MAP_SCALE; if(g_eye[0]> (MAP_W-2)*MAP_SCALE) g_eye[0]= (MAP_W-2)*MAP_SCALE; if(g_eye[2]<-(MAP_W-2)*MAP_SCALE) g_eye[2]=-(MAP_W-2)*MAP_SCALE; if(g_eye[2]> -MAP_SCALE) g_eye[2]= -MAP_SCALE; g_eye[1] =GetHeight((float)g_eye[0],(float)g_eye[2])+gao;//设置摄像机对地位置高 //摄像机的方向 g_look[0] = (float)(g_eye[0] +100*cos(rad_xz)); //目标点X分量 g_look[2] = (float)(g_eye[2] +100*sin(rad_xz)); //目标点Z分量 g_look[1] = g_eye[1] +g_elev; //目标点Y分量 //建立modelview矩阵方向 gluLookAt(g_eye[0],g_eye[1],g_eye[2], //视点 g_look[0],g_look[1],g_look[2], //目标点 0.0,1.0,0.0 //视点方向 ); return TRUE; } //========================================================================== void baiscobj::InitTerrain(float h)//建立地域数组 { int index = 0; int Vertex; for (int z = 0; z < MAP_W; z++) for (int x = 0; x < MAP_W; x++) { Vertex = z * MAP_W + x; g_terrain [Vertex][0] = float(x)*MAP_SCALE; //地域数据X分量 g_terrain [Vertex][1] = (float)(g_imageData[(z*MAP_W+x)*3]/3);//Y分量，山的高度 // g_terrain [Vertex][1] = h + FRAND * h; //Y分量，随机产生山的高度 g_terrain [Vertex][2] = -float(z)*MAP_SCALE; //地域数据Z分量 g_texcoord[Vertex][0] = (float) x; //索引数组x g_texcoord[Vertex][1] = (float) z; //索引数组z g_index [index++] = Vertex; //顶点数组1维 g_index [index++] = Vertex+ MAP_W; } glEnableClientState(GL_VERTEX_ARRAY); //允许使用地域数组 glVertexPointer (3,GL_FLOAT,0,g_terrain); //装入地域数据 glEnableClientState(GL_TEXTURE_COORD_ARRAY); //允许使用索引数组 glTexCoordPointer (2,GL_FLOAT,0,g_texcoord); //装入索引数组 } void baiscobj::DrawSand()//显示随机山势 { glBindTexture(GL_TEXTURE_2D, g_cactus[0]);//地贴图 glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);//放大采用线性滤波 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST); for (int z = 0; z < MAP_W-1; z++) glDrawElements(GL_TRIANGLE_STRIP,MAP_W*2,GL_UNSIGNED_INT,&g_index[z*MAP_W*2]); //显示由顶点数组指定的面。 } float baiscobj::GetHeight(float x, float z)// 取地面高度 { float CameraX = x/MAP_SCALE; //计算在那一块 float CameraZ =-z/MAP_SCALE; //计算在那一块 int Col0 = int(CameraX); //块的列号 int Row0 = int(CameraZ); //块的行号 int Col1 = Col0 + 1; //相邻列 int Row1 = Row0 + 1; //相邻行 if (Col1 > MAP_W) Col1 = 0; //相邻列大于地块数，取首列 if (Row1 > MAP_W) Row1 = 0; //相邻行大于地块数，取首行 float h00=g_terrain[Col0 + Row0*MAP_W][1];//获取块四角的高度 float h01=g_terrain[Col1 + Row0*MAP_W][1]; float h11=g_terrain[Col1 + Row1*MAP_W][1]; float h10=g_terrain[Col0 + Row1*MAP_W][1]; float tx =CameraX - int(CameraX); //求块内X偏移位置 float ty =CameraZ - int(CameraZ); //求块内Z偏移位置 float txty = tx * ty; //以下为双线性插值(内插)计算 return h00*(1.0f-ty-tx+txty) + h01*(tx-txty) + h11*txty + h10*(ty-txty); //返回插值计算值，为所求点的高度。 } void baiscobj::CreateSkyBox(int a,int wi,int he,int le)//显示天空 { float width =MAP*wi; // 天空盒宽 float height=MAP*he; // 天空盒高 float length=MAP*le; // 天空盒长 float x = MAP -width /2; // 天空的位置x float y = MAP/a-height/2; // 天空的位置y float z = -MAP -length/2; // 天空的位置z /////////////////////////////////////////////////////////////////////////////// texture(g_cactus[2]); // 设置BACK贴图左 glBegin(GL_QUADS); // 多组独立填充四边形 glTexCoord2f(1.0f,0.0f); glVertex3f(x+width,y, z); glTexCoord2f(1.0f,1.0f); glVertex3f(x+width,y+height,z); glTexCoord2f(0.0f,1.0f); glVertex3f(x, y+height,z); glTexCoord2f(0.0f,0.0f); glVertex3f(x, y, z); glEnd(); texture(g_cactus[3]); // 设置FRONT贴图右 glBegin(GL_QUADS); // 多组独立填充四边形 glTexCoord2f(1.0f,0.0f); glVertex3f(x, y, z+length); glTexCoord2f(1.0f,1.0f); glVertex3f(x, y+height,z+length); glTexCoord2f(0.0f,1.0f); glVertex3f(x+width,y+height,z+length); glTexCoord2f(0.0f,0.0f); glVertex3f(x+width,y, z+length); glEnd(); texture(g_cactus[4]); // 设置TOP贴图顶 glBegin(GL_QUADS); // 多组独立填充四边形 glTexCoord2f(0.0f,1.0f); glVertex3f(x+width,y+height,z); glTexCoord2f(0.0f,0.0f); glVertex3f(x+width,y+height,z+length); glTexCoord2f(1.0f,0.0f); glVertex3f(x, y+height,z+length); glTexCoord2f(1.0f,1.0f); glVertex3f(x, y+height,z); glEnd(); texture(g_cactus[5]); // 设置LEFT贴图前 glBegin(GL_QUADS); // 多组独立填充四边形 glTexCoord2f(1.0f,1.0f); glVertex3f(x, y+height,z); glTexCoord2f(0.0f,1.0f); glVertex3f(x, y+height,z+length); glTexCoord2f(0.0f,0.0f); glVertex3f(x, y, z+length); glTexCoord2f(1.0f,0.0f); glVertex3f(x, y,