计算机图形学实验三纹理映射Word下载.docx
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intmOldY,mOldX;
boolfullscreen;
////////////////////////////////////
floateye[3]={0.0f,0.0f,7.0f};
floatrot[3]={45.0f,45.0f,0.0f};
constintESC=27;
intwireframe=0;
constintGL_WIN_WIDTH=640;
constintGL_WIN_HEIGHT=480;
constintGL_WIN_INITIAL_X=0;
constintGL_WIN_INITIAL_Y=0;
/*arraytoholdtexturehandles*/
GLuintg_TexturesArray[MAX_TEXTURES];
BOOLLoadTextureGL（char*Filename,GLuint&
texture）//加载一个bmp图片（new）
{
AUX_RGBImageRec*TextureImage;
//为纹理开辟存储空间
FILE*File=NULL;
//文件句柄
if（!
Filename）//确保文件名已经提供
{
returnNULL;
//如果没有则返回NULL
}
File=fopen（Filename,"
r"
）;
//检查文件是否存在
if（File）//文件存在吗？
fclose（File）;
//关闭File文件句柄
TextureImage=auxDIBImageLoad（Filename）;
//载入图片并返回其指针
glGenTextures（1,&
texture）;
//返回唯一的纹理名字来标识纹理,保存在texture中
//使用来自位图数据生成的典型纹理
glBindTexture（GL_TEXTURE_2D,texture）;
//生成纹理
glTexImage2D（GL_TEXTURE_2D,0,3,TextureImage->
sizeX,TextureImage->
sizeY,
0,GL_RGB,GL_UNSIGNED_BYTE,TextureImage->
data）;
glTexParameteri（GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR）;
//线形滤波
glTexParameteri（GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR）;
if（TextureImage）//纹理是否存在
if（TextureImage->
data）//纹理图像是否存在
{
free（TextureImage->
//释放纹理存储空间
}
free（TextureImage）;
//释放图像结构
returntrue;
}
boolLoadBMP（char*filename,GLuint&
texture）//调贴图大小为2的幂
{AUX_RGBImageRec*pImage=NULL;
pImage=auxDIBImageLoad（filename）;
//装入位图
if（pImage==NULL）returnfalse;
//位图没装入返回错误
//生成贴图（纹理）
glBindTexture（GL_TEXTURE_2D,texture）;
//捆绑贴图（纹理）
gluBuild2DMipmaps（GL_TEXTURE_2D,4,//
pImage->
sizeX,//图形宽
sizeY,//图形高
GL_RGB,GL_UNSIGNED_BYTE,
data//图形数据
）;
free（pImage->
//释放位图数据占据的内存资源
free（pImage）;
//返回成功
voidInit（）
//glHint（GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST）;
//glShadeModel（GL_SMOOTH）;
glEnable（GL_DEPTH_TEST）;
glClearColor（0.0,0.0,0.0,1.0）;
//enabletextureandbindsatexturetothefirstelementofthearray
glEnable（GL_TEXTURE_2D）;
//LoadTextureGL（"
mybmp1.bmp"
g_TexturesArray[0]）;
Cars.bmp"
g_TexturesArray[1]）;
LoadBMP（"
1.bmp"
2.bmp"
3.bmp"
g_TexturesArray[2]）;
4.bmp"
g_TexturesArray[3]）;
5.bmp"
g_TexturesArray[4]）;
6.bmp"
g_TexturesArray[5]）;
return;
//------------------------------------------------------------------------
//Windowresizefunction
voidglutResize（intwidth,intheight）
glViewport（0,0,width,height）;
glMatrixMode（GL_PROJECTION）;
glLoadIdentity（）;
/*modifythislinetochangeperspectivevalues*/
gluPerspective（45.0,（float）width/（float）height,1.0,300.0）;
glMatrixMode（GL_MODELVIEW）;
//Functionthathandleskeyboardinputs
voidglutKeyboard（unsignedcharkey,intx,inty）
switch（key）
caseESC:
exit（0）;
case'
W'
:
w'
wireframe=!
wireframe;
voidclamp（float*v）
inti;
for（i=0;
i<
3;
i++）
if（v[i]>
360||v[i]<
-360）
v[i]=0;
//Movesthescreenbasedonmousepressedbutton
voidglutMotion（intx,inty）
if（mButton==BUTTON_LEFT）
/*rotatesscreen*/
rot[0]-=（mOldY-y）;
rot[1]-=（mOldX-x）;
clamp（rot）;
elseif（mButton==BUTTON_RIGHT）
eye[2]-=（mOldY-y）*0.05f;
//hereImultiplybya0.2factorto
//slowdownthezoom
}
elseif（mButton==BUTTON_LEFT_TRANSLATE）
eye[0]+=（mOldX-x）*0.01f;
eye[1]-=（mOldY-y）*0.01f;
mOldX=x;
mOldY=y;
//Functionthathandlesmouseinput
voidglutMouse（intbutton,intstate,intx,inty）
if（state==GLUT_DOWN）
switch（button）
caseGLUT_LEFT_BUTTON:
if（glutGetModifiers（）==GLUT_ACTIVE_CTRL）
mButton=BUTTON_LEFT_TRANSLATE;
break;
}else
mButton=BUTTON_LEFT;
caseGLUT_RIGHT_BUTTON:
mButton=BUTTON_RIGHT;
}elseif（state==GLUT_UP）
mButton=-1;
voidglutMenu（intvalue）
switch（value）
case1:
glutFullScreen（）;
return;
case2:
glutReshapeWindow（GL_WIN_WIDTH,GL_WIN_HEIGHT）;
case3:
voidglutSpecial（intvalue,intx,inty）
caseGLUT_KEY_F1:
if（fullscreen）glutFullScreen（）;
elseglutReshapeWindow（GL_WIN_WIDTH,GL_WIN_HEIGHT）;
fullscreen=!
fullscreen;
voidglutDisplay（void）
glClear（GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT）;
if（wireframe）
glPolygonMode（GL_FRONT_AND_BACK,GL_LINE）;
else
glPolygonMode（GL_FRONT_AND_BACK,GL_FILL）;
glPushMatrix（）;
/*translatecameratothecoordinatesprovidedbyeyearray*/
glTranslatef（-eye[0],-eye[1],-eye[2]）;
/*rotatesthescreenbytheanglesprovidedbyrotarray*/
glRotatef（rot[0],1.0f,0.0f,0.0f）;
glRotatef（rot[1],0.0f,1.0f,0.0f）;
glRotatef（rot[2],0.0f,0.0f,1.0f）;
glBindTexture（GL_TEXTURE_2D,g_TexturesArray[0]）;
glBegin（GL_QUADS）;
//FrontFace,red
glNormal3f（0.0f,0.0f,1.0f）;
glTexCoord2f（0.0f,0.0f）;
glColor3f（1.0f,1.0f,1.0f）;
glVertex3f（-1.0f,-1.0f,1.0f）;
glTexCoord2f（1.0f,0.0f）;
glVertex3f（1.0f,-1.0f,1.0f）;
glTexCoord2f（1.0f,1.0f）;
glColor3f（1.7f,1.0f,1.0f）;
glVertex3f（1.0f,1.0f,1.0f）;
glTexCoord2f（0.0f,1.0f）;
glVertex3f（-1.0f,1.0f,1.0f）;
glEnd（）;
glBindTexture（GL_TEXTURE_2D,g_TexturesArray[1]）;
//BackFace,green
glNormal3f（0.0f,0.0f,-1.0f）;
glVertex3f（-1.0f,-1.0f,-1.0f）;
glVertex3f（-1.0f,1.0f,-1.0f）;
glColor3f（1.0f,0.7f,1.0f）;
glVertex3f（1.0f,1.0f,-1.0f）;
glColor3f（1.0f,1.7f,1.0f）;
glVertex3f（1.0f,-1.0f,-1.0f）;
//TopFace,blue
glBindTexture（GL_TEXTURE_2D,g_TexturesArray[2]）;
glNormal3f（0.0f,1.0f,0.0f）;
glColor3f（1.0f,1.0f,1.7f）;
//BottomFace,yellow
glBindTexture（GL_TEXTURE_2D,g_TexturesArray[3]）;
glNormal3f（0.0f,-1.0f,0.0f）;
glColor3f（1.7f,1.7f,1.0f）;
//Rightface,cyan
glBindTexture（GL_TEXTURE_2D,g_TexturesArray[4]）;
glNormal3f（1.0f,0.0f,0.0f）;
glColor3f（1.0f,1.7f,1.7f）;
//LeftFace,magenta
glBindTexture（GL_TEXTURE_2D,g_TexturesArray[5]）;
glNormal3f（-1.0f,0.0f,0.0f）;
glColor3f（1.7f,1.0f,1.7f）;
glPopMatrix（）;
glFlush（）;
glutSwapBuffers（）;
rot[1]+=0.1;
intmain（intargc,char**argv）
{glutInitDisplayMode（GLUT_DOUBLE|GLUT_DEPTH|GLUT_RGBA）;
glutInitWindowPosition（GL_WIN_INITIAL_X,GL_WIN_INITIAL_Y）;
glutInitWindowSize（GL_WIN_WIDTH,GL_WIN_HEIGHT）;
glutInit（&
argc,argv）;
glutCreateWindow（"
bmp_maping"
glutReshapeFunc（glutResize）;
//calledeverytimethescreenisresized
glutDisplayFunc（glutDisplay）;
//calledwhenwindowneedstoberedisplayed
glutIdleFunc（glutDisplay）;
//calledwhenevertheapplicationisidle
glutKeyboardFunc（glutKeyboard）;
//calledwhentheapplicationreceivesainputfromtheke
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