What is "pixel packing"?

After a glRenderMode (GL_SELECT), no fragment are produced.

what will be drawn on the screen when the following drawing code is entered?

Which one is typically applied to the modelview matrix stack?

Difference between glLoadTransposeMatrix and glLoadMatrix?

Is there any non-structured flow of control like 'goto' in GLSL?

What is glTexCoord*() used for?

Can OpenGL automatically generate texture coordinates?

Is it possble to perform a reflection of an object across a specified axis?

What purpose does the "Scissor Test" serve?

What kind of coordinates are used in order to represent a transformation as a matrix multiplication operation?