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gl_framebuffer_object.py
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86 lines (73 loc) · 3.38 KB
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# ----------------------------------------------------------------------------
# cocos2d
# Copyright (c) 2008-2012 Daniel Moisset, Ricardo Quesada, Rayentray Tappa,
# Lucio Torre
# Copyright (c) 2009-2015 Richard Jones, Claudio Canepa
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of cocos2d nor the names of its
# contributors may be used to endorse or promote products
# derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ----------------------------------------------------------------------------
"""A thin wrapper for OpenGL framebuffer objets. For implementation use only"""
from __future__ import division, print_function, unicode_literals
__docformat__ = 'restructuredtext'
import ctypes as ct
from pyglet.gl import *
class FramebufferObject (object):
"""
Wrapper for framebuffer objects. See
http://oss.sgi.com/projects/ogl-sample/registry/EXT/framebuffer_object.txt
API is not very OO, should be improved.
"""
def __init__(self):
"""Create a new framebuffer object"""
id = GLuint(0)
glGenFramebuffersEXT(1, ct.byref(id))
self._id = id.value
def bind(self):
"""Set FBO as current rendering target"""
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, self._id)
def unbind(self):
"""Set default framebuffer as current rendering target"""
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0)
def texture2d(self, texture):
"""Map currently bound framebuffer (not necessarily self) to texture"""
glFramebufferTexture2DEXT(
GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
texture.target,
texture.id,
texture.level)
def check_status(self):
"""Check that currently set framebuffer is ready for rendering"""
status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT)
if status != GL_FRAMEBUFFER_COMPLETE_EXT:
raise Exception("Frambuffer not complete: %d" % status)
def __del__(self):
"""Delete the framebuffer from the GPU memory"""
id = GLuint(self._id)
glDeleteFramebuffersEXT(1, ct.byref(id))