This sample source is the method to make subwindow in the openGL programming.
The source may apply to your problem, because I have tried to make easy.
(Source Download)
#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();
}
