Jump to content
  • Advertisement
Sign in to follow this  
horizon981

Problem with basic GLUT program

This topic is 4513 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Hi. This is a simple GLUT program that animates a rectangle(moves it around). The code has been take from "OpenGL Super Bible" and is as below: //An animated square #include <windows.h> #include <gl\glut.h> GLfloat x1=100.0f; GLfloat y1=150.0f; GLsizei rsize=50; GLfloat xstep=1.0f; GLfloat ystep=1.0f; GLfloat windowWidth; GLfloat windowHeight; void RenderScene(void) { glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0f,0.0f,0.0f); glRectf(x1,y1,x1+rsize,y1+rsize); glutSwapBuffers(); } //Called by GLUT library when "idle" void TimerFunction(int value) { if( (x1 > windowWidth-rsize) || x1<0) xstep = -xstep; if( (y1 > windowHeight-rsize) || y1<0) ystep = -ystep; //Suspicious Code if(x1>windowWidth-rsize) x1=windowWidth-rsize-1; if(y1>windowHeight-rsize) y1=windowHeight-rsize-1; //End of Suspicious Code x1+=xstep; y1+=ystep; //Redraw the scene with new coordinates glutPostRedisplay(); glutTimerFunc(33,TimerFunction,1); } void SetupRC(void) { glClearColor(0.0f,1.0f,0.0f,1pppp.0f); } void ChangeSize(GLsizei w, GLsizei h) { if(h==0) h=1; glViewport(0,0,w,h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); if(w<=h) { windowHeight = 250.0f*h/w; windowWidth = 250.0f; } else { windowWidth = 250.0*w/h; windowHeight = 250.0f; } glOrtho(0.0f,windowWidth,0.0f,windowHeight,1.0f,-1.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } int main(void) { glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); glutCreateWindow("Bouncing Stuff"); glutDisplayFunc(RenderScene); glutReshapeFunc(ChangeSize); glutTimerFunc(33,TimerFunction,1); SetupRC(); glutMainLoop(); return 0; } //////////////////////////////////////////////////////////////// The problem: When the window appears, it shows nothing. In fact, when minimized and maximized, the new window captures the screen area behind it... much like the Print Screen button. I've checked and re-checked the code hundred times. Other demos have worked well on my PC. By the way, I'm using GLUT 3.7 with Dev C++. Thanks in advance.

Share this post


Link to post
Share on other sites
Advertisement
Sign in to follow this  

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!