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StupidTornado
09-11-2011, 12:12 PM
I'm a beginner at using OpenGL even though I've had some experience in C++.

I'm trying to draw shapes and manipulating them, and the code I was working with was running fine yesterday. However, today I boot up VS and every time I try to run my code the command prompt window says:

"Color Index Mode not supported
Press any key to continue..."

And the window just closes. I have absolutely no idea why this started happening, because I didn't change a single line of code. I'm not sure what the problem is either. Is it something that I have set up wrong? Because code that I know for a fact was working yesterday has this problem today. Google searches don't turn up anything, as if nobody else has had this problem and I have no idea what to do. Can anyone help, and possibly explain why this error is coming up?

Thanks in advance!

EDIT: Please let me know if I'm posting in the wrong location, and I apologize if I'm not in the right place.


#include <stdlib.h>
#include "glut.h"
#include <math.h>


const double TWO_PI = 6.2831853;

GLsizei winWidth = 500, winHeight = 500; // Initial display window size
GLuint regHex;
static GLfloat rotTheta = 0.0;

// stores a location
class scrPt {
public:
GLint x, y;
};

static void init (void)
{
scrPt hexVertex;
GLdouble hexTheta;
GLint k;

glClearColor (1.0, 1.0, 1.0, 0.0);

/* Set up a display list for a red regular hexagon
* Vertices for the hexagon are six equally spaced
* points around the circumference of a circle.
*/

regHex = glGenLists(1);
glNewList(regHex, GL_COMPILE);
glColor3f(1.0,0.0,0.0);
glBegin(GL_POLYGON);
for(k = 0; k < 6; k++){
hexTheta = TWO_PI * k / 6;
hexVertex.x = 150 + 100 * cos (hexTheta);
hexVertex.y = 150 + 100 * sin (hexTheta);
glVertex2i (hexVertex.x, hexVertex.y);
}
glEnd();
glEndList();
}

void displayHex (void)
{
glClear (GL_COLOR_BUFFER_BIT);

glPushMatrix();
glRotatef(rotTheta, 0.0, 0.0, 1.0);
glCallList(regHex);
glPopMatrix();

glutSwapBuffers();

glFlush();
}

void rotateHex (void)
{
rotTheta += 3.0;
if( rotTheta > 360.0)
rotTheta -= 360.0;

glutPostRedisplay();
}

void winReshapeFcn (GLint newWidth, GLint newHeight)
{
glViewport (0,0, (GLsizei) newWidth, (GLsizei) newHeight);

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-320.0, 320.0, -320.0, 320.0);

glMatrixMode (GL_MODELVIEW);
glLoadIdentity();

glClear (GL_COLOR_BUFFER_BIT);
}

void mouseFcn(GLint button, GLint action, GLint x, GLint y)
{
switch(button){
case GLUT_MIDDLE_BUTTON: // start the rotation
if(action == GLUT_DOWN)
glutIdleFunc(rotateHex);
break;
case GLUT_RIGHT_BUTTON: // stop the rotation
if(action == GLUT_DOWN)
glutIdleFunc(NULL);
break;
default:
break;
}
}

void main (int argc, char** argv)
{
glutInit(&amp;argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowPosition(150,150);
glutInitWindowSize(winWidth, winHeight);
glutCreateWindow ("Animation Example");

init();
glutDisplayFunc (displayHex);
glutReshapeFunc (winReshapeFcn);
glutMouseFunc (mouseFcn);

glutMainLoop();

}

BionicBytes
09-11-2011, 02:26 PM
what does glGetIntegerv() with GL_RED_BITS, GL_GREEN_BITS, GL_BLUE_BITS, GL_ALPHA_BITS, and GL_INDEX_BITS return?

Your glutInitDisplayMode does not include GLUT_INDEX
...so if no code was changed how did it ever wotk in the first place ;-)

My advise to you is to start including some logging to report back opengl state rather than assuming your context is exactly that which you asked for.