N00bie: crash under vista

OpenGL
1

{ glClear (GL_COLOR_BUFFER_BIT);
glColor3f (1.0, 1.0, 1.0);
glBegin(GL_POLYGON);
glVertex3f (0.25, 0.25, 0.0);
glVertex3f (0.75, 0.25, 0.0);
glVertex3f (0.75, 0.75, 0.0);
glVertex3f (0.25, 0.75, 0.0);
glEnd();
glFlush ();
}

Hey I am a newbie and trying out the tutorial
and get a crash at glClear(). here’s the disassembly :-

glClear (GL_COLOR_BUFFER_BIT);
mov esi,esp
push 4000h
call dword ptr [__imp__glClear@4 (2583E4h)]
cmp esi,esp <- crash esi:0,esp:2094716
call @ILT+380(__RTC_CheckEsp) (251181h)

I compiled it using VS20008.

2

Did you create a window and a context?

3

don’t know about context, but I have created a window.

4

hi,

as long as you have no valid opengl context, your opengl functions ( glClear() etc ) are not initialized at all, and point to nowhere/zero.

try eg. glut or something similar to create
a window with a valid opengl context.

best,
hendrik

5

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