chap11位图和图像.rar_NEHE_openGL 位图_opengl 图像_opengl教程

#include <windows.h> #include <GL/gl.h> #include <GL/glu.h> #include <GL/glaux.h> void myinit(void); void triangle(void); void SourceImage(void); void CALLBACK display(void); void CALLBACK myReshape(GLsizei w, GLsizei h); void myinit (void) { glClear (GL_COLOR_BUFFER_BIT); //glPixelZoom(0.5,0.5); // } void triangle(void) { glBegin (GL_TRIANGLES); glColor3f (0.0, 1.0, 0.0); glVertex2f (2.0, 3.0); glColor3f(0.0,0.0,1.0); glVertex2f (12.0, 3.0); glColor3f(1.0,0.0,0.0); glVertex2f (7.0, 12.0); glEnd (); } void SourceImage(void) { glPushMatrix(); glLoadIdentity(); glTranslatef(4.0,8.0,0.0); glScalef(0.5,0.5,0.5); triangle (); glPopMatrix(); } void CALLBACK display(void) { int i; /* 绘制原始图像 */ SourceImage(); /* 拷贝图像 */ for(i=0;i<5;i++) { //glPixelZoom((i+1)/5.,(i+1)/5.); glRasterPos2i( 1+i*2,i); glCopyPixels(160,310,170,160,GL_COLOR); } glFlush (); } void CALLBACK myReshape(GLsizei w, GLsizei h) { glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); if (w <= h) gluOrtho2D (0.0, 15.0, 0.0, 15.0 * (GLfloat) h/(GLfloat) w); else gluOrtho2D (0.0, 15.0 * (GLfloat) w/(GLfloat) h, 0.0, 15.0); glMatrixMode(GL_MODELVIEW); } void main(void) { auxInitDisplayMode (AUX_SINGLE | AUX_RGBA); auxInitPosition (0, 0, 500, 500); auxInitWindow ("Pixel Processing"); myinit(); auxReshapeFunc (myReshape); auxMainLoop(display); }