Re: OpenGL and SwapBuffers behavior

Just draw to your pbuffer as normal. Then copy this to a texture
you've created:

glBindTexture(GL_TEXTURE_2D, texture);
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, width(), height());

Then when you want to draw this texture, first enable it:

glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);

set up your coordinate system etc. then draw it using something like the following:

glColor4f(1.0, 1.0, 1.0, 0.0);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0); glVertex2i(m_World.left(), m_World.bottom());
glTexCoord2f(1.0, 0.0); glVertex2i(m_World.right(), m_World.bottom());
glTexCoord2f(1.0, 1.0); glVertex2i(m_World.right(), m_World.top());
glTexCoord2f(0.0, 1.0); glVertex2i(m_World.left(), m_World.top());
glEnd();

also look at GL_TEXTURE_RECTANGLE_ARB if you normally draw to a viewport
that is not square and a power of 2.


Well, I hammered away at it without success, because I am not giving
glCopyTexImage2D power of 2 limits when I feed it the zoom extents
I pick with my rubber band rectangle. And, I investigated
GL_TEXTURE_RECTANGLE_ARB and found my current drivers for
my NVIDIA graphics board don't support it.

So, I have downloaded the current drivers from NVIDIA which do support
non power of 2 rectangles, and am working up the courage to install
them!

Thanks,

B.C.

.

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