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598 lines
20 KiB
Python
598 lines
20 KiB
Python
# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of pyglet nor the names of its
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# contributors may be used to endorse or promote products
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# derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ----------------------------------------------------------------------------
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# $Id:$
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'''Byte abstractions of Vertex Buffer Objects and vertex arrays.
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Use `create_buffer` or `create_mappable_buffer` to create a Vertex Buffer
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Object, or a vertex array if VBOs are not supported by the current context.
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Buffers can optionally be created "mappable" (incorporating the
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`AbstractMappable` mix-in). In this case the buffer provides a ``get_region``
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method which provides the most efficient path for updating partial data within
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the buffer.
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'''
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__docformat__ = 'restructuredtext'
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__version__ = '$Id: $'
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import ctypes
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import sys
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import pyglet
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from pyglet.gl import *
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from pyglet.gl import gl_info
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_enable_vbo = pyglet.options['graphics_vbo']
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# Enable workaround permanently if any VBO is created on a context that has
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# this workaround. (On systems with multiple contexts where one is
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# unaffected, the workaround will be enabled unconditionally on all of the
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# contexts anyway. This is completely unlikely anyway).
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_workaround_vbo_finish = False
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def create_buffer(size,
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target=GL_ARRAY_BUFFER,
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usage=GL_DYNAMIC_DRAW,
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vbo=True):
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'''Create a buffer of vertex data.
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:Parameters:
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`size` : int
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Size of the buffer, in bytes
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`target` : int
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OpenGL target buffer
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`usage` : int
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OpenGL usage constant
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`vbo` : bool
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True if a `VertexBufferObject` should be created if the driver
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supports it; otherwise only a `VertexArray` is created.
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:rtype: `AbstractBuffer`
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'''
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from pyglet import gl
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if (vbo and
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gl_info.have_version(1, 5) and
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_enable_vbo and
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not gl.current_context._workaround_vbo):
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return VertexBufferObject(size, target, usage)
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else:
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return VertexArray(size)
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def create_mappable_buffer(size,
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target=GL_ARRAY_BUFFER,
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usage=GL_DYNAMIC_DRAW,
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vbo=True):
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'''Create a mappable buffer of vertex data.
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:Parameters:
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`size` : int
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Size of the buffer, in bytes
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`target` : int
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OpenGL target buffer
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`usage` : int
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OpenGL usage constant
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`vbo` : bool
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True if a `VertexBufferObject` should be created if the driver
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supports it; otherwise only a `VertexArray` is created.
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:rtype: `AbstractBuffer` with `AbstractMappable`
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'''
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from pyglet import gl
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if (vbo and
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gl_info.have_version(1, 5) and
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_enable_vbo and
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not gl.current_context._workaround_vbo):
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return MappableVertexBufferObject(size, target, usage)
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else:
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return VertexArray(size)
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class AbstractBuffer(object):
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'''Abstract buffer of byte data.
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:Ivariables:
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`size` : int
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Size of buffer, in bytes
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`ptr` : int
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Memory offset of the buffer, as used by the ``glVertexPointer``
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family of functions
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`target` : int
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OpenGL buffer target, for example ``GL_ARRAY_BUFFER``
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`usage` : int
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OpenGL buffer usage, for example ``GL_DYNAMIC_DRAW``
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'''
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ptr = 0
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size = 0
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def bind(self):
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'''Bind this buffer to its OpenGL target.'''
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raise NotImplementedError('abstract')
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def unbind(self):
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'''Reset the buffer's OpenGL target.'''
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raise NotImplementedError('abstract')
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def set_data(self, data):
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'''Set the entire contents of the buffer.
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:Parameters:
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`data` : sequence of int or ctypes pointer
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The byte array to set.
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'''
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raise NotImplementedError('abstract')
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def set_data_region(self, data, start, length):
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'''Set part of the buffer contents.
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:Parameters:
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`data` : sequence of int or ctypes pointer
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The byte array of data to set
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`start` : int
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Offset to start replacing data
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`length` : int
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Length of region to replace
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'''
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raise NotImplementedError('abstract')
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def map(self, invalidate=False):
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'''Map the entire buffer into system memory.
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The mapped region must be subsequently unmapped with `unmap` before
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performing any other operations on the buffer.
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:Parameters:
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`invalidate` : bool
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If True, the initial contents of the mapped block need not
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reflect the actual contents of the buffer.
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:rtype: ``POINTER(ctypes.c_ubyte)``
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:return: Pointer to the mapped block in memory
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'''
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raise NotImplementedError('abstract')
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def unmap(self):
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'''Unmap a previously mapped memory block.'''
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raise NotImplementedError('abstract')
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def resize(self, size):
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'''Resize the buffer to a new size.
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:Parameters:
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`size` : int
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New size of the buffer, in bytes
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'''
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def delete(self):
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'''Delete this buffer, reducing system resource usage.'''
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raise NotImplementedError('abstract')
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class AbstractMappable(object):
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def get_region(self, start, size, ptr_type):
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'''Map a region of the buffer into a ctypes array of the desired
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type. This region does not need to be unmapped, but will become
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invalid if the buffer is resized.
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Note that although a pointer type is required, an array is mapped.
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For example::
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get_region(0, ctypes.sizeof(c_int) * 20, ctypes.POINTER(c_int * 20))
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will map bytes 0 to 80 of the buffer to an array of 20 ints.
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Changes to the array may not be recognised until the region's
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`AbstractBufferRegion.invalidate` method is called.
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:Parameters:
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`start` : int
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Offset into the buffer to map from, in bytes
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`size` : int
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Size of the buffer region to map, in bytes
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`ptr_type` : ctypes pointer type
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Pointer type describing the array format to create
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:rtype: `AbstractBufferRegion`
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'''
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raise NotImplementedError('abstract')
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class VertexArray(AbstractBuffer, AbstractMappable):
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'''A ctypes implementation of a vertex array.
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Many of the methods on this class are effectively no-op's, such as `bind`,
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`unbind`, `map`, `unmap` and `delete`; they exist in order to present
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a consistent interface with `VertexBufferObject`.
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This buffer type is also mappable, and so `get_region` can be used.
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'''
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def __init__(self, size):
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self.size = size
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self.array = (ctypes.c_byte * size)()
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self.ptr = ctypes.cast(self.array, ctypes.c_void_p).value
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def bind(self):
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pass
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def unbind(self):
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pass
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def set_data(self, data):
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ctypes.memmove(self.ptr, data, self.size)
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def set_data_region(self, data, start, length):
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ctypes.memmove(self.ptr + start, data, length)
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def map(self, invalidate=False):
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return self.array
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def unmap(self):
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pass
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def get_region(self, start, size, ptr_type):
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array = ctypes.cast(self.ptr + start, ptr_type).contents
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return VertexArrayRegion(array)
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def delete(self):
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pass
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def resize(self, size):
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array = (ctypes.c_byte * size)()
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ctypes.memmove(array, self.array, min(size, self.size))
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self.size = size
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self.array = array
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self.ptr = ctypes.cast(self.array, ctypes.c_void_p).value
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class VertexBufferObject(AbstractBuffer):
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'''Lightweight representation of an OpenGL VBO.
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The data in the buffer is not replicated in any system memory (unless it
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is done so by the video driver). While this can improve memory usage and
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possibly performance, updates to the buffer are relatively slow.
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This class does not implement `AbstractMappable`, and so has no
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``get_region`` method. See `MappableVertexBufferObject` for a VBO class
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that does implement ``get_region``.
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'''
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def __init__(self, size, target, usage):
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self.size = size
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self.target = target
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self.usage = usage
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self._context = pyglet.gl.current_context
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id = GLuint()
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glGenBuffers(1, id)
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self.id = id.value
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glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
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glBindBuffer(target, self.id)
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glBufferData(target, self.size, None, self.usage)
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glPopClientAttrib()
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global _workaround_vbo_finish
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if pyglet.gl.current_context._workaround_vbo_finish:
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_workaround_vbo_finish = True
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def bind(self):
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glBindBuffer(self.target, self.id)
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def unbind(self):
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glBindBuffer(self.target, 0)
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def set_data(self, data):
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glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
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glBindBuffer(self.target, self.id)
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glBufferData(self.target, self.size, data, self.usage)
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glPopClientAttrib()
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def set_data_region(self, data, start, length):
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glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
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glBindBuffer(self.target, self.id)
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glBufferSubData(self.target, start, length, data)
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glPopClientAttrib()
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def map(self, invalidate=False):
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glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
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glBindBuffer(self.target, self.id)
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if invalidate:
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glBufferData(self.target, self.size, None, self.usage)
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ptr = ctypes.cast(glMapBuffer(self.target, GL_WRITE_ONLY),
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ctypes.POINTER(ctypes.c_byte * self.size)).contents
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glPopClientAttrib()
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return ptr
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def unmap(self):
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glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
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glUnmapBuffer(self.target)
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glPopClientAttrib()
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def __del__(self):
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try:
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if self.id is not None:
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self._context.delete_buffer(self.id)
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except:
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pass
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def delete(self):
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id = GLuint(self.id)
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glDeleteBuffers(1, id)
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self.id = None
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def resize(self, size):
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# Map, create a copy, then reinitialize.
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temp = (ctypes.c_byte * size)()
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glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
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glBindBuffer(self.target, self.id)
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data = glMapBuffer(self.target, GL_READ_ONLY)
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ctypes.memmove(temp, data, min(size, self.size))
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glUnmapBuffer(self.target)
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self.size = size
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glBufferData(self.target, self.size, temp, self.usage)
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glPopClientAttrib()
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class MappableVertexBufferObject(VertexBufferObject, AbstractMappable):
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'''A VBO with system-memory backed store.
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Updates to the data via `set_data`, `set_data_region` and `map` will be
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held in local memory until `bind` is called. The advantage is that fewer
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OpenGL calls are needed, increasing performance.
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There may also be less performance penalty for resizing this buffer.
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Updates to data via `map` are committed immediately.
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'''
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def __init__(self, size, target, usage):
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super(MappableVertexBufferObject, self).__init__(size, target, usage)
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self.data = (ctypes.c_byte * size)()
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self.data_ptr = ctypes.cast(self.data, ctypes.c_void_p).value
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self._dirty_min = sys.maxint
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self._dirty_max = 0
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def bind(self):
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# Commit pending data
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super(MappableVertexBufferObject, self).bind()
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size = self._dirty_max - self._dirty_min
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if size > 0:
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if size == self.size:
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glBufferData(self.target, self.size, self.data, self.usage)
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else:
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glBufferSubData(self.target, self._dirty_min, size,
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self.data_ptr + self._dirty_min)
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self._dirty_min = sys.maxint
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self._dirty_max = 0
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def set_data(self, data):
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super(MappableVertexBufferObject, self).set_data(data)
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ctypes.memmove(self.data, data, self.size)
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self._dirty_min = 0
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self._dirty_max = self.size
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def set_data_region(self, data, start, length):
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ctypes.memmove(self.data_ptr + start, data, length)
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self._dirty_min = min(start, self._dirty_min)
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self._dirty_max = max(start + length, self._dirty_max)
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def map(self, invalidate=False):
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self._dirty_min = 0
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self._dirty_max = self.size
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return self.data
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def unmap(self):
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pass
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def get_region(self, start, size, ptr_type):
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array = ctypes.cast(self.data_ptr + start, ptr_type).contents
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return VertexBufferObjectRegion(self, start, start + size, array)
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def resize(self, size):
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data = (ctypes.c_byte * size)()
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ctypes.memmove(data, self.data, min(size, self.size))
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self.data = data
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self.data_ptr = ctypes.cast(self.data, ctypes.c_void_p).value
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self.size = size
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glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
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glBindBuffer(self.target, self.id)
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glBufferData(self.target, self.size, self.data, self.usage)
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glPopClientAttrib()
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self._dirty_min = sys.maxint
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self._dirty_max = 0
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class AbstractBufferRegion(object):
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'''A mapped region of a buffer.
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Buffer regions are obtained using `AbstractMappable.get_region`.
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:Ivariables:
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`array` : ctypes array
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Array of data, of the type and count requested by ``get_region``.
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'''
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def invalidate(self):
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'''Mark this region as changed.
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The buffer may not be updated with the latest contents of the
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array until this method is called. (However, it may not be updated
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until the next time the buffer is used, for efficiency).
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'''
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pass
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class VertexBufferObjectRegion(AbstractBufferRegion):
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'''A mapped region of a VBO.'''
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def __init__(self, buffer, start, end, array):
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self.buffer = buffer
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self.start = start
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self.end = end
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self.array = array
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def invalidate(self):
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buffer = self.buffer
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buffer._dirty_min = min(buffer._dirty_min, self.start)
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buffer._dirty_max = max(buffer._dirty_max, self.end)
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class VertexArrayRegion(AbstractBufferRegion):
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'''A mapped region of a vertex array.
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The `invalidate` method is a no-op but is provided in order to present
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a consistent interface with `VertexBufferObjectRegion`.
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'''
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def __init__(self, array):
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self.array = array
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class IndirectArrayRegion(AbstractBufferRegion):
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'''A mapped region in which data elements are not necessarily contiguous.
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This region class is used to wrap buffer regions in which the data
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must be accessed with some stride. For example, in an interleaved buffer
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this region can be used to access a single interleaved component as if the
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data was contiguous.
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'''
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def __init__(self, region, size, component_count, component_stride):
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'''Wrap a buffer region.
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Use the `component_count` and `component_stride` parameters to specify
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the data layout of the encapsulated region. For example, if RGBA
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data is to be accessed as if it were packed RGB, ``component_count``
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would be set to 3 and ``component_stride`` to 4. If the region
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contains 10 RGBA tuples, the ``size`` parameter is ``3 * 10 = 30``.
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:Parameters:
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`region` : `AbstractBufferRegion`
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The region with interleaved data
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`size` : int
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The number of elements that this region will provide access to.
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`component_count` : int
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The number of elements that are contiguous before some must
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be skipped.
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`component_stride` : int
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The number of elements of interleaved data separating
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the contiguous sections.
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'''
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self.region = region
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self.size = size
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self.count = component_count
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self.stride = component_stride
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self.array = self
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def __repr__(self):
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return 'IndirectArrayRegion(size=%d, count=%d, stride=%d)' % (
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self.size, self.count, self.stride)
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def __getitem__(self, index):
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count = self.count
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if not isinstance(index, slice):
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elem = index // count
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j = index % count
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return self.region.array[elem * self.stride + j]
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start = index.start or 0
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stop = index.stop
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step = index.step or 1
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if start < 0:
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|
start = self.size + start
|
|
if stop is None:
|
|
stop = self.size
|
|
elif stop < 0:
|
|
stop = self.size + stop
|
|
|
|
assert step == 1 or step % count == 0, \
|
|
'Step must be multiple of component count'
|
|
|
|
data_start = (start // count) * self.stride + start % count
|
|
data_stop = (stop // count) * self.stride + stop % count
|
|
data_step = step * self.stride
|
|
|
|
# TODO stepped getitem is probably wrong, see setitem for correct.
|
|
value_step = step * count
|
|
|
|
# ctypes does not support stepped slicing, so do the work in a list
|
|
# and copy it back.
|
|
data = self.region.array[:]
|
|
value = [0] * ((stop - start) // step)
|
|
stride = self.stride
|
|
for i in range(count):
|
|
value[i::value_step] = \
|
|
data[data_start + i:data_stop + i:data_step]
|
|
return value
|
|
|
|
def __setitem__(self, index, value):
|
|
count = self.count
|
|
if not isinstance(index, slice):
|
|
elem = index // count
|
|
j = index % count
|
|
self.region.array[elem * self.stride + j] = value
|
|
return
|
|
|
|
start = index.start or 0
|
|
stop = index.stop
|
|
step = index.step or 1
|
|
if start < 0:
|
|
start = self.size + start
|
|
if stop is None:
|
|
stop = self.size
|
|
elif stop < 0:
|
|
stop = self.size + stop
|
|
|
|
assert step == 1 or step % count == 0, \
|
|
'Step must be multiple of component count'
|
|
|
|
data_start = (start // count) * self.stride + start % count
|
|
data_stop = (stop // count) * self.stride + stop % count
|
|
|
|
# ctypes does not support stepped slicing, so do the work in a list
|
|
# and copy it back.
|
|
data = self.region.array[:]
|
|
if step == 1:
|
|
data_step = self.stride
|
|
value_step = count
|
|
for i in range(count):
|
|
data[data_start + i:data_stop + i:data_step] = \
|
|
value[i::value_step]
|
|
else:
|
|
data_step = (step // count) * self.stride
|
|
data[data_start:data_stop:data_step] = value
|
|
self.region.array[:] = data
|
|
|
|
def invalidate(self):
|
|
self.region.invalidate()
|