348 lines
12 KiB
Python
348 lines
12 KiB
Python
# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# Copyright (c) 2008-2022 pyglet contributors
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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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"""Byte abstractions of OpenGL Buffer Objects.
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Use `create_buffer` to create a Buffer Object.
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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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import sys
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import ctypes
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import pyglet
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from pyglet.gl import *
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class AbstractBuffer:
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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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`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, target=GL_ARRAY_BUFFER):
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"""Bind this buffer to an 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):
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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:
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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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:py:meth:`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: :py:class:`AbstractBufferRegion`
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"""
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raise NotImplementedError('abstract')
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class BufferObject(AbstractBuffer):
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"""Lightweight representation of an OpenGL Buffer Object.
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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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The target of the buffer is ``GL_ARRAY_BUFFER`` internally to avoid
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accidentally overriding other states when altering the buffer contents.
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The intended target can be set when binding the buffer.
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This class does not implement :py:class:`AbstractMappable`, and so has no
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:py:meth:`~AbstractMappable.get_region` method. See
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:py:class:`MappableVertexBufferObject` for a Buffer class
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that does implement :py:meth:`~AbstractMappable.get_region`.
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"""
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def __init__(self, size, usage=GL_DYNAMIC_DRAW):
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self.size = size
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self.usage = usage
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self._context = pyglet.gl.current_context
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buffer_id = GLuint()
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glGenBuffers(1, buffer_id)
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self.id = buffer_id.value
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glBindBuffer(GL_ARRAY_BUFFER, self.id)
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data = (GLubyte * self.size)()
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glBufferData(GL_ARRAY_BUFFER, self.size, data, self.usage)
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def invalidate(self):
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glBufferData(GL_ARRAY_BUFFER, self.size, None, self.usage)
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def bind(self, target=GL_ARRAY_BUFFER):
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glBindBuffer(target, self.id)
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def unbind(self):
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glBindBuffer(GL_ARRAY_BUFFER, 0)
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def bind_to_index_buffer(self):
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"""Binds this buffer as an index buffer on the active vertex array."""
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, self.id)
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def set_data(self, data):
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glBindBuffer(GL_ARRAY_BUFFER, self.id)
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glBufferData(GL_ARRAY_BUFFER, self.size, data, self.usage)
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def set_data_region(self, data, start, length):
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glBindBuffer(GL_ARRAY_BUFFER, self.id)
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glBufferSubData(GL_ARRAY_BUFFER, start, length, data)
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def map(self):
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glBindBuffer(GL_ARRAY_BUFFER, self.id)
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ptr = ctypes.cast(glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY), ctypes.POINTER(ctypes.c_byte * self.size)).contents
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return ptr
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def map_range(self, start, size, ptr_type):
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glBindBuffer(GL_ARRAY_BUFFER, self.id)
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ptr = ctypes.cast(glMapBufferRange(GL_ARRAY_BUFFER, start, size, GL_MAP_WRITE_BIT), ptr_type).contents
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return ptr
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def unmap(self):
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glUnmapBuffer(GL_ARRAY_BUFFER)
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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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buffer_id = GLuint(self.id)
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try:
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glDeleteBuffers(1, buffer_id)
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except Exception:
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pass
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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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glBindBuffer(GL_ARRAY_BUFFER, self.id)
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data = glMapBufferRange(GL_ARRAY_BUFFER, 0, self.size, GL_MAP_READ_BIT)
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ctypes.memmove(temp, data, min(size, self.size))
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glUnmapBuffer(GL_ARRAY_BUFFER)
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self.size = size
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glBufferData(GL_ARRAY_BUFFER, self.size, temp, self.usage)
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def __repr__(self):
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return f"{self.__class__.__name__}(id={self.id}, size={self.size})"
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class MappableBufferObject(BufferObject, AbstractMappable):
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"""A buffer 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 :py:meth:`map` are committed immediately.
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"""
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def __init__(self, size, usage=GL_DYNAMIC_DRAW):
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super(MappableBufferObject, self).__init__(size, usage)
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self.data = (ctypes.c_byte * size)()
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self.data_ptr = ctypes.addressof(self.data)
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self._dirty_min = sys.maxsize
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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(MappableBufferObject, 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(GL_ARRAY_BUFFER, self.size, self.data, self.usage)
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else:
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glBufferSubData(GL_ARRAY_BUFFER, self._dirty_min, size, self.data_ptr + self._dirty_min)
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self._dirty_min = sys.maxsize
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self._dirty_max = 0
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def set_data(self, data):
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super(MappableBufferObject, 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 BufferObjectRegion(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.addressof(self.data)
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self.size = size
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glBindBuffer(GL_ARRAY_BUFFER, self.id)
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glBufferData(GL_ARRAY_BUFFER, self.size, self.data, self.usage)
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self._dirty_min = sys.maxsize
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self._dirty_max = 0
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class BufferObjectRegion:
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"""A mapped region of a MappableBufferObject."""
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__slots__ = 'buffer', 'start', 'end', 'array'
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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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"""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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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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