I've been teaching myself opengl recently, and I've hit a wall, which
is what to do with bottlenecks, or let alone, figure out what is
causing them.
I wrote a short program (based off of the pyglet "hene" port of the
nehe lesson1 base case) to illustrate what is vexing me, or atleast as
best as I can pin it down;
I have a function called "call", which is called from the on_draw
event of the window, and the function contains the following code:
def call(self):
if not self.__compiled:
glNewList(self.__dl, GL_COMPILE)
r = 5
ci = 0
span = range(r*-4, (r*4)+1, 4)
for x in span:
for y in span:
draw_cube(x, 0, y, ci)
ci +=1
if ci > 1:
ci = 0
glEndList()
self.__compiled = True
glCallList(self.__dl)
the "draw_cube" function just calls a glBegin(GL_QUADS), 24
glVertex3f's, and the glEnd()
When I run this program with just the basecode (eg, I have the call
function commented out),
the thing can do well over 60 fps (spikes over 100, sporadically).
When I have the function in the code, the code plummets to an average
of 20fps.
What do I need to do to be able to draw more than a handful of
polygons without dramatic slowdowns???
ps: my gpu is an intel 945gm; not exactly a powerhouse, but the code
has been tested on other machines with similar results.
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