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#!/usr/bin/env python
# This is a mapping between the pixmap-mixed.c program written
# by Naofumi for GtkGLExt. I've changed that to Python in an
# OO manner. It's a simple test that mixes OpenGL and GDK drawing
# calls using a GdkPixmap. In the end we end up with a black
# rectangle drawn by GDK and a reddish sphere drawn on top the
# rectangle by OpenGL.
#
# Alif Wahid, March 2003.
#
# Rewritten in object-oriented style.
# --Naofumi
#
import sys
import gc
import pygtk
pygtk.require('2.0')
import gtk
import gtk.gtkgl
from OpenGL.GL import *
from OpenGL.GLU import *
class PixmapMixedDrawingArea(gtk.DrawingArea):
"""Drawing area for pixmap-mixed demo."""
def __init__(self, glconfig):
gtk.DrawingArea.__init__(self)
# Set colormap for OpenGL visual.
self.set_colormap(glconfig.get_colormap())
self.glconfig = glconfig
self.pixmap = None
self.glcontext = None
# Connect the relevant signals.
self.connect('configure_event', self._on_configure_event)
self.connect('expose_event', self._on_expose_event)
self.connect('unrealize', self._on_unrealize)
def _init_gl(self):
light_diffuse = [1.0, 0.0, 0.0, 1.0]
light_position = [1.0, 1.0, 1.0, 0.0]
qobj = gluNewQuadric()
gluQuadricDrawStyle(qobj, GLU_FILL)
glNewList(1, GL_COMPILE)
gluSphere(qobj, 1.0, 20, 20)
glEndList()
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse)
glLightfv(GL_LIGHT0, GL_POSITION, light_position)
glEnable(GL_LIGHTING)
glEnable(GL_LIGHT0)
glEnable(GL_DEPTH_TEST)
glClearColor(1.0, 1.0, 1.0, 1.0)
glClearDepth(1.0)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(40.0, 1.0, 1.0, 10.0)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
gluLookAt(0.0, 0.0, 3.0,
0.0, 0.0, 0.0,
0.0, 1.0, 0.0)
glTranslatef(0.0, 0.0, -3.0)
def _on_configure_event(self, *args):
self.pixmap = None
gc.collect()
# Create gtk.gdk.Pixmap with OpenGL extension API support.
self.pixmap = gtk.gdkgl.ext(gtk.gdk.Pixmap(self.window,
self.allocation.width,
self.allocation.height))
# Add OpenGL-capability to the pixmap.
gldrawable = self.pixmap.set_gl_capability(self.glconfig)
# Then create an indirect OpenGL rendering context.
if not self.glcontext:
self.glcontext = gtk.gdkgl.Context(gldrawable,
direct=False)
if not self.glcontext:
raise SystemExit, "** Cannot create OpenGL rendering context!"
print "OpenGL rendering context is created."
# Init flag.
self.glcontext.is_initialized = False
# OpenGL begin
if not gldrawable.gl_begin(self.glcontext):
return False
if not self.glcontext.is_initialized:
print "Initialize OpenGL rendering context."
self._init_gl()
self.glcontext.is_initialized = True
glViewport(0, 0, self.allocation.width, self.allocation.height)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
# Synchronize with OpenGL before proceeding further.
gldrawable.wait_gl()
# Draw a black rectangle using GDK.
width, height = gldrawable.get_size()
gldrawable.draw_rectangle(self.get_style().black_gc, True,
width/10, height/10,
width*8/10, height*8/10)
# Synchronize with GDK before proceeding further.
gldrawable.wait_gdk()
glCallList(1)
glFlush()
# OpenGL end
gldrawable.gl_end()
return False
def _on_expose_event(self, widget, event):
# The expose function is rather trivial
# since we only have to copy the pixmap
# onto the onscreen drawable (gdk.Window).
x, y, width, height = event.area
gc = widget.get_style().fg_gc[gtk.STATE_NORMAL]
self.window.draw_drawable(gc, self.pixmap, x, y, x, y, width, height)
return False
def _on_unrealize(self, *args):
print "Unref pixmap and glcontext."
self.pixmap = None
self.glcontext = None
gc.collect()
class PixmapMixedDemo(gtk.Window):
"""Pixmap-mixed demo application."""
def __init__(self):
gtk.Window.__init__(self)
self.set_title('pixmap-mixed')
self.connect('delete_event', gtk.main_quit)
# VBox to hold everything.
vbox = gtk.VBox()
self.add(vbox)
# Query the OpenGL extension version.
print "OpenGL extension version - %d.%d\n" % gtk.gdkgl.query_version()
# Configure OpenGL framebuffer.
# Try to get a single-buffered framebuffer configuration.
display_mode = (gtk.gdkgl.MODE_RGB |
gtk.gdkgl.MODE_DEPTH |
gtk.gdkgl.MODE_SINGLE)
try:
glconfig = gtk.gdkgl.Config(mode=display_mode)
except gtk.gdkgl.NoMatches:
raise SystemExit
print "is RGBA:", glconfig.is_rgba()
print "is double-buffered:", glconfig.is_double_buffered()
print "is stereo:", glconfig.is_stereo()
print "has alpha:", glconfig.has_alpha()
print "has depth buffer:", glconfig.has_depth_buffer()
print "has stencil buffer:", glconfig.has_stencil_buffer()
print "has accumulation buffer:", glconfig.has_accum_buffer()
print
# PixmapMixedDrawingArea
drawing_area = PixmapMixedDrawingArea(glconfig)
drawing_area.set_size_request(200, 200)
vbox.pack_start(drawing_area)
# Unrealize drawing_area on quit.
gtk.quit_add(gtk.main_level()+1, self._on_quit, drawing_area)
# A quit button.
button = gtk.Button('Quit')
button.connect('clicked', gtk.main_quit)
vbox.pack_start(button, expand=False)
def _on_quit(self, drawing_area):
# Unrealize drawing_area to destroy the rendering context explicitly.
drawing_area.unrealize()
class _Main(object):
"""Simple application driver."""
def __init__(self, app):
self.app = app
def run(self):
self.app.show_all()
gtk.main()
if __name__ == '__main__':
_Main(PixmapMixedDemo()).run()
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