Hi, I've just begun exploring Pyglet, and I've stumbled on something that
doesn't make sense to me.
I've been experimenting with creating windows, resizing them, and calling
gluOrtho2D to set their projection matrix. It seems that if the window is
resized, the projection matrix is incorrect.
Following is a small script that creates two windows, one with the default
640x480 size, which then gets resized to 256x256, and a second which gets
created at 256x256 to begin with. I call gluOrtho2D in each case to the same
value, and in my update loop, I draw a triangle. I would expect each window
to draw the triangle in the same way, but the triangle doesn't appear on the
window that was resized from 640x480.
A telling clue is shown when the user resizes the windows by dragging on the
border - the missing triangle can be found by resizing the "resized" window
back to around 640x480, as though there was some initial state that's not
properly updated when I do the resize. Also, when the user resizes the
window that started off at 256x256, the triangle remains the same size
onscreen (64x64 pixels, a quarter of the window's original dimensions),
while I would expect the triangle to resize to be a quarter of the window's
new dimensions.
At a guess, I'm thinking that the very last step in the view pipeline that
converts to actual device(window) coordinates still knows about the original
window's size.
I did a glGetFloatv(GL_PROJECTION_MATRIX) on both windows (not shown in the
included code), and the values are identical.
I also tried replacing gluOrtho2D with glOrtho, and the results are the
same.
Am I forgetting a step to make the orthographic projections work properly?
Or is it, in fact, working properly, and I'm expecting it to behave
differently than it's designed to?
I'm running on Windows XP, Python 2.4, with a Pyglet version I got from SVN,
version 1272.
Thanks,
Dave LeCompte
=======
from pyglet import window
from pyglet.gl import *
allWindows=[]
def onWindowResize(width,height):
print "window size",width,height
recalcMatrices()
def recalcMatrices():
for w in allWindows:
print "resetting projection matrix for window",w.caption
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluOrtho2D(-1,1,-1,1)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
w=window.Window(caption="resized", resizable=True)
w.set_size(256,256)
w.on_resize=onWindowResize
w.set_location(50,50)
allWindows.append(w)
w=window.Window(256,256,caption="pristine", resizable=True)
w.on_resize=onWindowResize
w.set_location(350,50)
allWindows.append(w)
recalcMatrices()
running=True
while running:
for w in allWindows:
w.dispatch_events()
if w.has_exit:
running=False
for w in allWindows:
w.switch_to()
glClear(GL_COLOR_BUFFER_BIT)
glBegin(GL_TRIANGLES)
glColor3f(1.0, 0.0, 0.0)
glVertex2f(0.0,0.0)
glColor3f(0.0, 1.0, 0.0)
glVertex2f(0.5,0.0)
glColor3f(0.0, 0.0, 1.0)
glVertex2f(0.5,0.5)
glEnd()
w.flip()
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