Glut Problem

[Klaus Ramstöck <klra67 at freenet dot de>]

Dear list,

I tried to compile f90gl under a current cygwin. With some grey hair, I
succeded, but my programs dont start. I analysed the problem an can
reproduce it with this modified example glut program.
>From /usr/share/doc/opengl-1.1.0/GLUTexamples/helloGlut.c:
----cut
#include <stdio.h>
#include <GL/glut.h>
#include <GL/glutf90.h>

unsigned int i = 1;

void display_func(void)
{
if (i%2)
    glClearColor(1., 0., 0., 1.); /* Red */
else
    glClearColor(0., 0., 1., 1.); /* Blue */
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
}

void keyboard_func(unsigned char key, int x, int y)
{
if (key=='\033') /* ESC */
   exit(0);
++i;
glutPostRedisplay();
}

void exit_func(void)
{
printf("Goodbye.\n");
}
#define GLUTCALLBACKFCB
typedef void (GLUTCALLBACKFCB *GLUTbuttonBoxFCBUSR) (int *, int *);

int main(int argc, char* argv[])
{
atexit(exit_func);
glutInit(&argc, argv);
glutCreateWindow("Hello GLUT!");
glutDisplayFunc(display_func);
glutKeyboardFunc(keyboard_func);
printf("Press any key to toggle color.\n");
printf("Press Esc to end.\n");
glutMainLoop();
int button, state;
 ((GLUTbuttonBoxFCBUSR)__glutGetFCB(GLUT_FCB_BUTTON_BOX))(&button, &state);
return 0;
}

----cut

The only relevant difference is this line:
 ((GLUTbuttonBoxFCBUSR)__glutGetFCB(GLUT_FCB_BUTTON_BOX))(&button, &state)

Without this line, the program compiles and works as expected.
It seems there is a mismatch between the definition of __glutGetFCB
in the .a and in the .dll file.

Can anybody confirm this and help me fix it?


Thank you.

Klaus

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