The source may apply to your problem, because I have tried to make easy.
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#include "glut.h" #include#include using namespace std; #define GAP 25 /* gap between subwindows */ GLuint window, View1, View2, View3, View4; GLuint sub_width = 256, sub_height = 256; void main_display(void); void main_reshape(int width, int height); void setfont(char* name, int size); void drawstr(GLuint x, GLuint y, const char* format, int length); GLvoid *font_style = GLUT_BITMAP_TIMES_ROMAN_10; void View1Display(); void View2Display(); void View3Display(); void View4Display(); void ResetViewport(); int main() { //Mode Setting glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); //window size (+gap size) glutInitWindowSize(512+GAP*3, 512+GAP*3); //Initial position glutInitWindowPosition(50, 50); //Main Window window = glutCreateWindow("ViewPort Test"); //Main Window callback function glutReshapeFunc(main_reshape); glutDisplayFunc(main_display); //World Window and Display View1 = glutCreateSubWindow(window, GAP, GAP, 256, 256); glutDisplayFunc(View1Display); //screen Window and Display View2 = glutCreateSubWindow(window, GAP+256+GAP, GAP, 256, 256); glutDisplayFunc(View2Display); //command Window and Display View3 = glutCreateSubWindow(window, GAP+256+GAP, GAP+256+GAP, 256, 256); glutDisplayFunc(View3Display); View4 = glutCreateSubWindow(window, GAP+256+GAP, GAP+256+GAP, 256, 256); glutDisplayFunc(View4Display); glutMainLoop(); return 0; } void main_display(void) { //Background Color glClearColor(0.8, 0.8, 0.8, 0.0); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //font color and style glColor3ub(0, 0, 0); setfont("helvetica", 12); //1st window name string str = "View1"; drawstr(GAP, GAP-5, str.c_str(), str.length()); //2st window name str = "View2"; drawstr(GAP+sub_width+GAP, GAP-5, str.c_str(), str.length()); //3st widnow name str = "View3"; drawstr(GAP, GAP+sub_height+GAP-5, str.c_str(), str.length()); //4st widnow name str = "View4"; drawstr(GAP+sub_width+GAP, GAP+sub_height+GAP-5, str.c_str(), str.length()); //last glutSwapBuffers(); } //Background Window Setting void main_reshape(int width, int height) { //main view setting glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0, width, height, 0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); sub_width = (width-GAP*3)/2.0; sub_height = (height-GAP*3)/2.0; //View1 Display glutSetWindow(View1); glutPositionWindow(GAP, GAP); glutReshapeWindow(sub_width, sub_height); //View2 Display glutSetWindow(View2); glutPositionWindow(GAP+sub_width+GAP, GAP); glutReshapeWindow(sub_width, sub_height); //View3 Display glutSetWindow(View3); glutPositionWindow(GAP, GAP+sub_height+GAP); glutReshapeWindow(sub_width, sub_height); //View4 Display glutSetWindow(View4); glutPositionWindow(GAP+sub_width+GAP, GAP+sub_height+GAP); glutReshapeWindow(sub_width, sub_height); //glutReshapeWindow(sub_width+GAP+sub_width, sub_height); } //Font setting void setfont(char* name, int size) { font_style = GLUT_BITMAP_HELVETICA_10; if (strcmp(name, "helvetica") == 0) { if (size == 12) font_style = GLUT_BITMAP_HELVETICA_12; else if (size == 18) font_style = GLUT_BITMAP_HELVETICA_18; } else if (strcmp(name, "times roman") == 0) { font_style = GLUT_BITMAP_TIMES_ROMAN_10; if (size == 24) font_style = GLUT_BITMAP_TIMES_ROMAN_24; } else if (strcmp(name, "8x13") == 0) { font_style = GLUT_BITMAP_8_BY_13; } else if (strcmp(name, "9x15") == 0) { font_style = GLUT_BITMAP_9_BY_15; } } //String Draw void drawstr(GLuint x, GLuint y, const char* format, int length) { glRasterPos2i(x, y); for(int i=0; i glutBitmapCharacter(font_style, *(format+i) ); } //Display Teapot void DrawScene() { glColor3f(0.7, 0.7, 0.7); glPushMatrix(); //glTranslatef(0.0, -1.0, 0.0); glBegin(GL_QUADS); glVertex3f(2.0, 0.0, 2.0); glVertex3f(2.0, 0.0, -2.0); glVertex3f(-2.0, 0.0, -2.0); glVertex3f(-2.0, 0.0, 2.0); glEnd(); glPopMatrix(); glColor3f(1.0, 1.0, 1.0); glPushMatrix(); glTranslatef(0.0, 0.0, -0.5); glutWireTeapot(1.0); glPopMatrix(); } //View1Display void View1Display(){ //viewport rest; ResetViewport(); glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0, 1.0, 1.0); glPushMatrix(); gluLookAt(0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); DrawScene(); glPopMatrix(); glutSwapBuffers(); } //View2Display void View2Display(){ //viewport rest; ResetViewport(); glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0, 1.0, 1.0); glPushMatrix(); gluLookAt(1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); DrawScene(); glPopMatrix(); glutSwapBuffers(); } //View3Display void View3Display(){ //viewport rest; ResetViewport(); glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0, 1.0, 1.0); glPushMatrix(); gluLookAt(0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -1.0); DrawScene(); glPopMatrix(); glutSwapBuffers(); } //View4Display void View4Display(){ //viewport rest; ResetViewport(); glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0, 1.0, 1.0); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); gluPerspective(30, 1.0, 3.0, 50.0); glMatrixMode(GL_MODELVIEW); glPushMatrix(); gluLookAt(5.0, 5.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); DrawScene(); glPopMatrix(); glMatrixMode(GL_PROJECTION); glPopMatrix(); glFlush(); glutSwapBuffers(); } void ResetViewport() { glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-2.0, 2.0, -2.0, 2.0, 0.5, 5.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); }
