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POOpenGL on Fedora 15
 

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  1. POOpenGL on Fedora 15
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    <p>I am trying to program in OpenGL.</p> <p>so wrote a test program call t_gl1.cpp</p> <p>I built it successfully with</p> <p>$ g++ t_gl1.cpp -lglut -lGL -lGLU -o t_gl1</p> <p>No any error.</p> <p>However, if I try to run it, I got </p> <p>freeglut (./t_gl1): ERROR: Internal error in function fgOpenWindow X Error of failed request: BadWindow (invalid Window parameter) Major opcode of failed request: 4 (X_DestroyWindow) Resource id in failed request: 0x0 Serial number of failed request: 26 Current serial number in output stream: 29</p> <p>Does any one know what is going on?</p> <p>Here is the code, tested on Windows and Mac, no problem. But can't get it run on Fedora nor Ubuntu</p> <pre><code>#include &lt;iostream&gt; #include &lt;stdlib.h&gt; #ifdef __APPLE__ #include &lt;OpenGL/OpenGL.h&gt; #include &lt;GLUT/glut.h&gt; #else #include &lt;GL/glut.h&gt; #endif using namespace std; //Called when a key is pressed void handleKeypress(unsigned char key, //The key that was pressed int x, int y) { //The current mouse coordinates switch (key) { case 27: //Escape key exit(0); //Exit the program } } //Initializes 3D rendering void initRendering() { //Makes 3D drawing work when something is in front of something else glEnable(GL_DEPTH_TEST); glEnable(GL_COLOR_MATERIAL); //NEW OF THIS glClearColor(0.7f,0.9f,1.0f,1.0f); //background, last number to be 1.0f } //Called when the window is resized void handleResize(int w, int h) { //Tell OpenGL how to convert from coordinates to pixel values glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); //Switch to setting the camera perspective //Set the camera perspective glLoadIdentity(); //Reset the camera gluPerspective(45.0, //The camera angle (double)w / (double)h, //The width-to-height ratio 1.0, //The near z clipping coordinate 200.0); //The far z clipping coordinate } float _angle=30.0f; //kinda global variable //Draws the 3D scene void drawScene() { //Clear information from last draw glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); //Switch to the drawing perspective glLoadIdentity(); //Reset the drawing perspective glTranslatef(0.0f,0.0f,-5.0f); glPushMatrix(); glRotatef(_angle, 0.0f, 1.0f , 0.0f); glColor3f(0.5f,0.0f,0.8f); glBegin(GL_QUADS); //Begin quadrilateral coordinates //Trapezoid glVertex3f(-0.7f, -1.5f, 0.0f); glVertex3f(0.7f, -1.5f, 0.0f); glVertex3f(0.4f, -0.5f, 0.0f); glVertex3f(-0.4f, -0.5f, 0.0f); glEnd(); //End quadrilateral coordinates glPopMatrix(); glPushMatrix(); //push glRotatef(_angle, 1.0f, 0.0f, 0.0f); glBegin(GL_TRIANGLES); //Begin triangle coordinates Begin Pentagon glColor3f(1.0f,0.0f,0.0f); //Pentagon glVertex3f(0.5f, 0.5f, -0.0f); glVertex3f(1.5f, 0.5f, -0.0f); glVertex3f(0.5f, 1.0f, -0.0f); glVertex3f(0.5f, 1.0f, -0.0f); glVertex3f(1.5f, 0.5f, -0.0f); glVertex3f(1.5f, 1.0f, -0.0f); glVertex3f(0.5f, 1.0f, -0.0f); glVertex3f(1.5f, 1.0f, -0.0f); glVertex3f(1.0f, 1.5f, -0.0f); glEnd(); //end Pentagon glPopMatrix(); //pop glPushMatrix(); glRotatef(_angle, -1.0f, 1.0f, 0.0f); glBegin(GL_TRIANGLES); //Triangle glVertex3f(-0.5f, 0.5f, 0.0f); glColor3f(0.0f, 1.0f, 0.0f); glVertex3f(-1.0f, 1.5f, -0.0f); glColor3f(0.0f, 0.0f, 1.0f); glVertex3f(-1.5f, 0.5f, -0.0f); glEnd(); //End triangle coordinates glPopMatrix(); glutSwapBuffers(); //Send the 3D scene to the screen } void update(int value) { _angle+=2.0f; if(_angle&gt;360) _angle-=360; glutPostRedisplay(); glutTimerFunc(25,update,0); } int main(int argc, char** argv) { //Initialize GLUT glutInit(&amp;argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize(400, 400); //Set the window size //Create the window glutCreateWindow("window"); initRendering(); //Initialize rendering //Set handler functions for drawing, keypresses, and window resizes glutDisplayFunc(drawScene); //display the "drwwScene" most important part, others are settings glutKeyboardFunc(handleKeypress); glutReshapeFunc(handleResize); glutTimerFunc(25,update,0); //add the timer function to make animation glutMainLoop(); //Start the main loop. glutMainLoop doesn't return. return 0; //This line is never reached } </code></pre>
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    1. USAlfred Zhong
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    1. COYou should really be using the `glut*()` functions; they're more portable. This could be your problem.
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      1. POOpenGL on Fedora 15
      1. USBojangles
    2. COI did. I never call this "fgOpenWindow", it must be called by the glut (freeglut)
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      1. POOpenGL on Fedora 15
      1. USAlfred Zhong
    3. COOh right. My bad. Can you post the code (or part of it, if it's long) that goes with this question?
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      1. POOpenGL on Fedora 15
      1. USBojangles
 

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