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POdisplay function not working while using OpenGL
 

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  1. POdisplay function not working while using OpenGL
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    <p>i am trying to draw a line using OpenGL while the both end coordinates of the line are set in the idle function , but it is not getting drawn while I am sending the endpoint coordinates over the network using sockets. below is the snap of the code</p> <pre><code>int main(int argc, char **argv) { glutInit(&amp;argc,argv); glutInitWindowSize( 1024,1024); /* A x A pixel screen window */ glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE); glutCreateWindow("Skeleton Tracker"); /* window title */ glutDisplayFunc(display); /* tell OpenGL main loop what */ glutIdleFunc(idle); //first create the connection then we wil talk about the data transfer... /*****Code for server connection *****/ processRequest(); return 0; } void processrequest() { byte_sent = send(ClientSocket,(char*)&amp;msg_pkt,sizeof(MSG_PACKET),0); ofile&lt;&lt;"\nByte sent for start generating "&lt;&lt;byte_sent&lt;&lt;endl; Sleep(1000); memset(buf,0,sizeof(buf)); glutMainLoop(); } void display(void) { glClearColor(1.0f, 1.0f, 1.0f, 1.0f); glClear(GL_COLOR_BUFFER_BIT); /* clear the window */ glColor3f ( 0.0, 1.0 , 0.0); /* draw in light red */ glBegin(GL_LINES); glVertex2f(x[0] , y[0]); glVertex2f(x[1] , y[1]); glEnd(); glEnd(); glFlush(); } void idle(void) { printf("\nIn Idle function\n"); nRetVal = recv(ClientSocket , (char*)mainbuf , 192,0); printf("\nAmount of data received : %d\n" , nRetVal); memcpy(buf , mainbuf , sizeof(buf)); //buf is of 8 bytes to hold 2 floating nos. memcpy( &amp;x[p] ,buf , 4); // upto 3 x[p] = x[p]/10.0; memcpy( &amp;y[p] ,buf+4 , 4); //upto 7 y[p] = y[p]/10.0; glutPostRedisplay(); } </code></pre>
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    1. COThe programmer is always the BEST person to debug! Try stepping through or rather try putting `printf(..)` statements to analyse what are the values of `x[0]`, `y[0]` and so on. Just a piece of (unrelated) advice: Its always a good practice to do Network I/O on a different thread.. :)
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    2. CO@Thrustmaster The values are OK . I logged the values and then removed the code..its problem related to OpenGL not with the values.
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    3. COWhat are the values? IIRC in this setup, the coordinates need to be within [-1,1]..
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