What does Flip really do?

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simonh
 #1
Here's the GL code for DrawRect in glmax2d.bmx:

		glBegin GL_QUADS
		glVertex2f x0*ix+y0*iy+tx,x0*jx+y0*jy+ty
		glVertex2f x1*ix+y0*iy+tx,x1*jx+y0*jy+ty
		glVertex2f x1*ix+y1*iy+tx,x1*jx+y1*jy+ty
		glVertex2f x0*ix+y1*iy+tx,x0*jx+y1*jy+ty
		glEnd

As you can see only the single quad is drawn inbetween glBegin and glEnd. If you were to fit more glVertex commands in there you could get a speed gain.

Using vertex arrays would offer another speed gain, replacing all the glVertex calls with a single pointer to an array.