I''ve seen other projects that have a constantly updating title bar (i.e, "NeHe''s OpenGL - FPS 324" and the 324 would change every .5 second). How would one go about this using NeHe''s Core? I''ve only been able to get it to change when switching from fullscreen to windowed.

There is a function ... to update it, but I forgot the name ...

Doesn''t the SetWindowText() do the trick?

Yes, SetWindowText works,
but how do you make this function write the variable integer (FPS) when it expects const char * as an argument?

thanks,
Quo

use sprintf()

I use:

fps=1000.0/(TimerGetTime()-start2);
sprintf(cOutBuffer, "fps = %0.1f", fps);
start2=TimerGetTime();
SetWindowText(hWnd, cOutBuffer);

But i think it slow the thing down...you could try a quad which changes length placed over a scale - 2 extra quads are very quick to draw. ( plus it works in fullscreen mode)

alistair

Ali, that''d be a great idea, except how would you judge the scale? I know you''d have to make a BMP of the scale, but how would you figure out that, for example, 0.5f is 1 fps? Would the calculations be in the Draw function, or would you have to draw the bitmap to fit the code?

ok, I use:

glPushMatrix();
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glBindTexture(GL_TEXTURE_2D, 20);
glColor3f(1.0f, 1.0f, 1.0f);
glTranslatef(0.0f, -3.4f, -8.0f);
glBegin(GL_QUADS);
glTexCoord2i(0, 1); glVertex3f(-4.0f, 0.5f, 0.0f);
glTexCoord2i(0, 0); glVertex3f(-4.0f, -0.5f, 0.0f);
glTexCoord2i(1, 0); glVertex3f(4.0f, -0.5f, 0.0f);
glTexCoord2i(1, 1); glVertex3f(4.0f, 0.5f, 0.0f);
glEnd();

glDisable(GL_TEXTURE_2D);

if(fps<130) glColor4f(1.0f, 1.0f, 0.0f, 0.8f);
else glColor4f(1.0f, 0.0f, 0.0f, 0.8f);
glBegin(GL_QUADS);
glVertex3f(-4.0f, 0.5f, 0.0f);
glVertex3f(-4.0f, 0.2f, 0.0f);
glVertex3f(-4.0f+0.053f*fps, 0.2f, 0.0f);
glVertex3f(-4.0f+0.053f*fps, 0.5f, 0.0f);
glEnd();

glPopMatrix();

which draws a yellow bar, or a red one if greater than 130fps
the above code can obviously be optimized a lot - eg using a list for the first half.

alistair