class FBOWindow(PyprocessingWindow):
"""This is a pyglet window where drawing in fact occurs inside an FBO.
The flip method is overridden so that instead of merely swapping the
back and front buffers, the FBO is first blitted onto the back buffer.
The idea is to provide a stable drawing canvas which is not erased or
corrupted by the flip."""
def __init__(self, *args, **keyargs):
"""Constructor"""
# construct the base class
super(FBOWindow, self).__init__(*args, **keyargs)
# construct the fbo and attach it
self.fbo = FBO(self.width, self.height)
self.fbo.attach()
def flip(self):
"""Override the flip method."""
# cease using the FBO and start using the regular frame buffer
self.fbo.detach()
# save the OpenGL state
glMatrixMode(GL_PROJECTION)
glPushMatrix()
glLoadIdentity()
glMatrixMode(GL_MODELVIEW)
glPushMatrix()
glLoadIdentity()
glPushAttrib(GL_ALL_ATTRIB_BITS)
glViewport(0, 0, self.width, self.height)
# Draws a quad with the fbo as a texture
glDisable(GL_BLEND)
glDisable(GL_DEPTH_TEST)
glDisable(GL_LIGHTING)
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL)
glEnable(GL_TEXTURE_2D)
glColor3f(1, 1, 1)
glBindTexture(GL_TEXTURE_2D, self.fbo.img)
glBegin(GL_QUADS)
for v, t in [((-1, -1, 0), (0, 0)), ((-1, 1, 0), (0, 1)),
((1, 1, 0), (1, 1)), ((1, -1, 0), (1, 0))]:
glTexCoord2f(*t)
glVertex3f(*v)
glEnd()
# restore the state
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glPopMatrix()
glPopAttrib()
# do the actual flip
super(FBOWindow, self).flip()
# reattach the fbo for further drawing
self.fbo.attach()
def on_resize(self, w, h):
super(FBOWindow, self).on_resize(w, h)
self.fbo.detach()
self.fbo = FBO(w, h)
self.fbo.attach()
class FBOWindow(PyprocessingWindow):
"""This is a pyglet window where drawing in fact occurs inside a FBO.
The flip method is overridden so that instead of merely swapping the
back and front buffers, the FBO is first blitted onto the back buffer.
The idea is to provide a stable drawing canvas which is not erased or
corrupted by the flip."""
def __init__(self, *args, **keyargs):
"""Constructor"""
# construct the base class
super(FBOWindow, self).__init__(*args, **keyargs)
# construct the fbo and attach it
self.fbo = FBO(self.width, self.height)
self.fbo.attach()
def flip(self):
"""Override the flip method."""
# cease using the FBO and start using the regular frame buffer
self.fbo.detach()
# save the OpenGL state
glMatrixMode(GL_PROJECTION)
glPushMatrix()
glLoadIdentity()
glMatrixMode(GL_MODELVIEW)
glPushMatrix()
glLoadIdentity()
glViewport(0, 0, self.width, self.height)
# prepares and blits the FBO buffer onto the back buffer.
glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, self.fbo.framebuffer)
glReadBuffer(GL_COLOR_ATTACHMENT0_EXT)
glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0)
glDrawBuffer(GL_BACK)
glBlitFramebufferEXT(0, 0, self.width, self.height, 0, 0, self.width,
self.height, GL_COLOR_BUFFER_BIT, GL_NEAREST)
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glPopMatrix()
# do the actual flip
super(FBOWindow, self).flip()
# reattach the fbo for further drawing
self.fbo.attach()
def on_resize(self, w, h):
super(FBOWindow, self).on_resize(w, h)
self.fbo.detach()
self.fbo = FBO(w, h)
self.fbo.attach()
class FBOWindow(PyprocessingWindow):
"""This is a pyglet window where drawing in fact occurs inside a FBO.
The flip method is overridden so that instead of merely swapping the
back and front buffers, the FBO is first blitted onto the back buffer.
The idea is to provide a stable drawing canvas which is not erased or
corrupted by the flip."""
def __init__(self, *args, **keyargs):
"""Constructor"""
# construct the base class
super(FBOWindow, self).__init__(*args, **keyargs)
# construct the fbo and attach it
self.fbo = FBO(self.width, self.height)
self.fbo.attach()
def flip(self):
"""Override the flip method."""
# cease using the FBO and start using the regular frame buffer
self.fbo.detach()
# save the OpenGL state
glMatrixMode(GL_PROJECTION)
glPushMatrix()
glLoadIdentity()
glMatrixMode(GL_MODELVIEW)
glPushMatrix()
glLoadIdentity()
glViewport(0,0,self.width,self.height)
# prepares and blits the FBO buffer onto the back buffer.
glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, self.fbo.framebuffer)
glReadBuffer(GL_COLOR_ATTACHMENT0_EXT)
glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0)
glDrawBuffer(GL_BACK)
glBlitFramebufferEXT(0, 0, self.width, self.height, 0, 0, self.width, self.height, GL_COLOR_BUFFER_BIT, GL_NEAREST);
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glPopMatrix()
# do the actual flip
super (FBOWindow, self).flip()
# reattach the fbo for further drawing
self.fbo.attach()
def on_resize(self,w,h):
super (FBOWindow, self).on_resize(w,h)
self.fbo.detach()
self.fbo = FBO(w,h)
self.fbo.attach()
class FBOWindow(PyprocessingWindow):
"""This is a pyglet window where drawing in fact occurs inside an FBO.
The flip method is overridden so that instead of merely swapping the
back and front buffers, the FBO is first blitted onto the back buffer.
The idea is to provide a stable drawing canvas which is not erased or
corrupted by the flip."""
def __init__(self, *args, **keyargs):
"""Constructor"""
# construct the base class
super(FBOWindow, self).__init__(*args, **keyargs)
# construct the fbo and attach it
self.fbo = FBO(self.width, self.height)
self.fbo.attach()
def flip(self):
"""Override the flip method."""
# cease using the FBO and start using the regular frame buffer
self.fbo.detach()
# save the OpenGL state
glMatrixMode(GL_PROJECTION)
glPushMatrix()
glLoadIdentity()
glMatrixMode(GL_MODELVIEW)
glPushMatrix()
glLoadIdentity()
glPushAttrib(GL_ALL_ATTRIB_BITS)
glViewport(0,0,self.width,self.height)
# Draws a quad with the fbo as a texture
glDisable(GL_BLEND)
glDisable(GL_DEPTH_TEST)
glDisable(GL_LIGHTING)
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL)
glEnable(GL_TEXTURE_2D)
glColor3f(1,1,1)
glBindTexture(GL_TEXTURE_2D, self.fbo.img)
glBegin(GL_QUADS)
for v,t in [((-1,-1,0),(0,0)),
((-1,1,0),(0,1)),
((1,1,0),(1,1)),
((1,-1,0),(1,0))]:
glTexCoord2f(*t)
glVertex3f(*v)
glEnd()
# restore the state
glMatrixMode(GL_PROJECTION)
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
glPopMatrix()
glPopAttrib()
# do the actual flip
super (FBOWindow, self).flip()
# reattach the fbo for further drawing
self.fbo.attach()
def on_resize(self,w,h):
super (FBOWindow, self).on_resize(w,h)
self.fbo.detach()
self.fbo = FBO(w,h)
self.fbo.attach()
