598 lines
20 KiB
Python
598 lines
20 KiB
Python
# ----------------------------------------------------------------------------
|
|
# pyglet
|
|
# Copyright (c) 2006-2008 Alex Holkner
|
|
# Copyright (c) 2008-2021 pyglet contributors
|
|
# 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 pyglet 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.
|
|
# ----------------------------------------------------------------------------
|
|
|
|
"""Byte abstractions of Vertex Buffer Objects and vertex arrays.
|
|
|
|
Use :py:func:`create_buffer` or :py:func:`create_mappable_buffer` to create a
|
|
Vertex Buffer Object, or a vertex array if VBOs are not supported by the
|
|
current context.
|
|
|
|
Buffers can optionally be created "mappable" (incorporating the
|
|
:py:class:`AbstractMappable` mix-in). In this case the buffer provides a
|
|
:py:meth:`~AbstractMappable.get_region` method which provides the most
|
|
efficient path for updating partial data within the buffer.
|
|
"""
|
|
|
|
import sys
|
|
import ctypes
|
|
|
|
import pyglet
|
|
from pyglet.gl import *
|
|
|
|
_enable_vbo = pyglet.options['graphics_vbo']
|
|
|
|
# Enable workaround permanently if any VBO is created on a context that has
|
|
# this workaround. (On systems with multiple contexts where one is
|
|
# unaffected, the workaround will be enabled unconditionally on all of the
|
|
# contexts anyway. This is completely unlikely anyway).
|
|
_workaround_vbo_finish = False
|
|
|
|
|
|
def create_buffer(size, target=GL_ARRAY_BUFFER, usage=GL_DYNAMIC_DRAW, vbo=True):
|
|
"""Create a buffer of vertex data.
|
|
|
|
:Parameters:
|
|
`size` : int
|
|
Size of the buffer, in bytes
|
|
`target` : int
|
|
OpenGL target buffer
|
|
`usage` : int
|
|
OpenGL usage constant
|
|
`vbo` : bool
|
|
True if a `VertexBufferObject` should be created if the driver
|
|
supports it; otherwise only a `VertexArray` is created.
|
|
|
|
:rtype: `AbstractBuffer`
|
|
"""
|
|
from pyglet import gl
|
|
if (vbo and
|
|
gl_info.have_version(1, 5) and
|
|
_enable_vbo and
|
|
not gl.current_context._workaround_vbo):
|
|
return VertexBufferObject(size, target, usage)
|
|
else:
|
|
return VertexArray(size)
|
|
|
|
|
|
def create_mappable_buffer(size, target=GL_ARRAY_BUFFER, usage=GL_DYNAMIC_DRAW, vbo=True):
|
|
"""Create a mappable buffer of vertex data.
|
|
|
|
:Parameters:
|
|
`size` : int
|
|
Size of the buffer, in bytes
|
|
`target` : int
|
|
OpenGL target buffer
|
|
`usage` : int
|
|
OpenGL usage constant
|
|
`vbo` : bool
|
|
True if a :py:class:`VertexBufferObject` should be created if the driver
|
|
supports it; otherwise only a :py:class:`VertexArray` is created.
|
|
|
|
:rtype: :py:class:`AbstractBuffer` with :py:class:`AbstractMappable`
|
|
"""
|
|
from pyglet import gl
|
|
if (vbo and
|
|
gl_info.have_version(1, 5) and
|
|
_enable_vbo and
|
|
not gl.current_context._workaround_vbo):
|
|
return MappableVertexBufferObject(size, target, usage)
|
|
else:
|
|
return VertexArray(size)
|
|
|
|
|
|
class AbstractBuffer:
|
|
"""Abstract buffer of byte data.
|
|
|
|
:Ivariables:
|
|
`size` : int
|
|
Size of buffer, in bytes
|
|
`ptr` : int
|
|
Memory offset of the buffer, as used by the ``glVertexPointer``
|
|
family of functions
|
|
`target` : int
|
|
OpenGL buffer target, for example ``GL_ARRAY_BUFFER``
|
|
`usage` : int
|
|
OpenGL buffer usage, for example ``GL_DYNAMIC_DRAW``
|
|
|
|
"""
|
|
|
|
ptr = 0
|
|
size = 0
|
|
|
|
def bind(self):
|
|
"""Bind this buffer to its OpenGL target."""
|
|
raise NotImplementedError('abstract')
|
|
|
|
def unbind(self):
|
|
"""Reset the buffer's OpenGL target."""
|
|
raise NotImplementedError('abstract')
|
|
|
|
def set_data(self, data):
|
|
"""Set the entire contents of the buffer.
|
|
|
|
:Parameters:
|
|
`data` : sequence of int or ctypes pointer
|
|
The byte array to set.
|
|
|
|
"""
|
|
raise NotImplementedError('abstract')
|
|
|
|
def set_data_region(self, data, start, length):
|
|
"""Set part of the buffer contents.
|
|
|
|
:Parameters:
|
|
`data` : sequence of int or ctypes pointer
|
|
The byte array of data to set
|
|
`start` : int
|
|
Offset to start replacing data
|
|
`length` : int
|
|
Length of region to replace
|
|
|
|
"""
|
|
raise NotImplementedError('abstract')
|
|
|
|
def map(self, invalidate=False):
|
|
"""Map the entire buffer into system memory.
|
|
|
|
The mapped region must be subsequently unmapped with `unmap` before
|
|
performing any other operations on the buffer.
|
|
|
|
:Parameters:
|
|
`invalidate` : bool
|
|
If True, the initial contents of the mapped block need not
|
|
reflect the actual contents of the buffer.
|
|
|
|
:rtype: ``POINTER(ctypes.c_ubyte)``
|
|
:return: Pointer to the mapped block in memory
|
|
"""
|
|
raise NotImplementedError('abstract')
|
|
|
|
def unmap(self):
|
|
"""Unmap a previously mapped memory block."""
|
|
raise NotImplementedError('abstract')
|
|
|
|
def resize(self, size):
|
|
"""Resize the buffer to a new size.
|
|
|
|
:Parameters:
|
|
`size` : int
|
|
New size of the buffer, in bytes
|
|
|
|
"""
|
|
|
|
def delete(self):
|
|
"""Delete this buffer, reducing system resource usage."""
|
|
raise NotImplementedError('abstract')
|
|
|
|
|
|
class AbstractMappable:
|
|
def get_region(self, start, size, ptr_type):
|
|
"""Map a region of the buffer into a ctypes array of the desired
|
|
type. This region does not need to be unmapped, but will become
|
|
invalid if the buffer is resized.
|
|
|
|
Note that although a pointer type is required, an array is mapped.
|
|
For example::
|
|
|
|
get_region(0, ctypes.sizeof(c_int) * 20, ctypes.POINTER(c_int * 20))
|
|
|
|
will map bytes 0 to 80 of the buffer to an array of 20 ints.
|
|
|
|
Changes to the array may not be recognised until the region's
|
|
:py:meth:`AbstractBufferRegion.invalidate` method is called.
|
|
|
|
:Parameters:
|
|
`start` : int
|
|
Offset into the buffer to map from, in bytes
|
|
`size` : int
|
|
Size of the buffer region to map, in bytes
|
|
`ptr_type` : ctypes pointer type
|
|
Pointer type describing the array format to create
|
|
|
|
:rtype: :py:class:`AbstractBufferRegion`
|
|
"""
|
|
raise NotImplementedError('abstract')
|
|
|
|
|
|
class VertexArray(AbstractBuffer, AbstractMappable):
|
|
"""A ctypes implementation of a vertex array.
|
|
|
|
Many of the methods on this class are effectively no-op's, such as
|
|
:py:meth:`bind`, :py:meth:`unbind`, :py:meth:`map`, :py:meth:`unmap` and
|
|
:py:meth:`delete`; they exist in order to present
|
|
a consistent interface with :py:class:`VertexBufferObject`.
|
|
|
|
This buffer type is also mappable, and so :py:meth:`get_region` can be used.
|
|
"""
|
|
|
|
def __init__(self, size):
|
|
self.size = size
|
|
|
|
self.array = (ctypes.c_byte * size)()
|
|
self.ptr = ctypes.cast(self.array, ctypes.c_void_p).value
|
|
|
|
def bind(self):
|
|
pass
|
|
|
|
def unbind(self):
|
|
pass
|
|
|
|
def set_data(self, data):
|
|
ctypes.memmove(self.ptr, data, self.size)
|
|
|
|
def set_data_region(self, data, start, length):
|
|
ctypes.memmove(self.ptr + start, data, length)
|
|
|
|
def map(self, invalidate=False):
|
|
return self.array
|
|
|
|
def unmap(self):
|
|
pass
|
|
|
|
def get_region(self, start, size, ptr_type):
|
|
array = ctypes.cast(self.ptr + start, ptr_type).contents
|
|
return VertexArrayRegion(array)
|
|
|
|
def delete(self):
|
|
pass
|
|
|
|
def resize(self, size):
|
|
array = (ctypes.c_byte * size)()
|
|
ctypes.memmove(array, self.array, min(size, self.size))
|
|
self.size = size
|
|
self.array = array
|
|
self.ptr = ctypes.cast(self.array, ctypes.c_void_p).value
|
|
|
|
|
|
class VertexBufferObject(AbstractBuffer):
|
|
"""Lightweight representation of an OpenGL VBO.
|
|
|
|
The data in the buffer is not replicated in any system memory (unless it
|
|
is done so by the video driver). While this can improve memory usage and
|
|
possibly performance, updates to the buffer are relatively slow.
|
|
|
|
This class does not implement :py:class:`AbstractMappable`, and so has no
|
|
:py:meth:`~AbstractMappable.get_region` method. See
|
|
:py:class:`MappableVertexBufferObject` for a VBO class
|
|
that does implement :py:meth:`~AbstractMappable.get_region`.
|
|
"""
|
|
|
|
def __init__(self, size, target, usage):
|
|
self.size = size
|
|
self.target = target
|
|
self.usage = usage
|
|
self._context = pyglet.gl.current_context
|
|
|
|
id = GLuint()
|
|
glGenBuffers(1, id)
|
|
self.id = id.value
|
|
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
|
|
glBindBuffer(target, self.id)
|
|
glBufferData(target, self.size, None, self.usage)
|
|
glPopClientAttrib()
|
|
|
|
global _workaround_vbo_finish
|
|
if pyglet.gl.current_context._workaround_vbo_finish:
|
|
_workaround_vbo_finish = True
|
|
|
|
def bind(self):
|
|
glBindBuffer(self.target, self.id)
|
|
|
|
def unbind(self):
|
|
glBindBuffer(self.target, 0)
|
|
|
|
def set_data(self, data):
|
|
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
|
|
glBindBuffer(self.target, self.id)
|
|
glBufferData(self.target, self.size, data, self.usage)
|
|
glPopClientAttrib()
|
|
|
|
def set_data_region(self, data, start, length):
|
|
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
|
|
glBindBuffer(self.target, self.id)
|
|
glBufferSubData(self.target, start, length, data)
|
|
glPopClientAttrib()
|
|
|
|
def map(self, invalidate=False):
|
|
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
|
|
glBindBuffer(self.target, self.id)
|
|
if invalidate:
|
|
glBufferData(self.target, self.size, None, self.usage)
|
|
ptr = ctypes.cast(glMapBuffer(self.target, GL_WRITE_ONLY),
|
|
ctypes.POINTER(ctypes.c_byte * self.size)).contents
|
|
glPopClientAttrib()
|
|
return ptr
|
|
|
|
def unmap(self):
|
|
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
|
|
glUnmapBuffer(self.target)
|
|
glPopClientAttrib()
|
|
|
|
def __del__(self):
|
|
try:
|
|
if self.id is not None:
|
|
self._context.delete_buffer(self.id)
|
|
except:
|
|
pass
|
|
|
|
def delete(self):
|
|
id = GLuint(self.id)
|
|
glDeleteBuffers(1, id)
|
|
self.id = None
|
|
|
|
def resize(self, size):
|
|
# Map, create a copy, then reinitialize.
|
|
temp = (ctypes.c_byte * size)()
|
|
|
|
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
|
|
glBindBuffer(self.target, self.id)
|
|
data = glMapBuffer(self.target, GL_READ_ONLY)
|
|
ctypes.memmove(temp, data, min(size, self.size))
|
|
glUnmapBuffer(self.target)
|
|
|
|
self.size = size
|
|
glBufferData(self.target, self.size, temp, self.usage)
|
|
glPopClientAttrib()
|
|
|
|
|
|
class MappableVertexBufferObject(VertexBufferObject, AbstractMappable):
|
|
"""A VBO with system-memory backed store.
|
|
|
|
Updates to the data via :py:meth:`set_data`, :py:meth:`set_data_region` and
|
|
:py:meth:`map` will be held in local memory until :py:meth:`bind` is
|
|
called. The advantage is that fewer OpenGL calls are needed, increasing
|
|
performance.
|
|
|
|
There may also be less performance penalty for resizing this buffer.
|
|
|
|
Updates to data via :py:meth:`map` are committed immediately.
|
|
"""
|
|
|
|
def __init__(self, size, target, usage):
|
|
super(MappableVertexBufferObject, self).__init__(size, target, usage)
|
|
self.data = (ctypes.c_byte * size)()
|
|
self.data_ptr = ctypes.cast(self.data, ctypes.c_void_p).value
|
|
self._dirty_min = sys.maxsize
|
|
self._dirty_max = 0
|
|
|
|
def bind(self):
|
|
# Commit pending data
|
|
super(MappableVertexBufferObject, self).bind()
|
|
size = self._dirty_max - self._dirty_min
|
|
if size > 0:
|
|
if size == self.size:
|
|
glBufferData(self.target, self.size, self.data, self.usage)
|
|
else:
|
|
glBufferSubData(self.target, self._dirty_min, size,
|
|
self.data_ptr + self._dirty_min)
|
|
self._dirty_min = sys.maxsize
|
|
self._dirty_max = 0
|
|
|
|
def set_data(self, data):
|
|
super(MappableVertexBufferObject, self).set_data(data)
|
|
ctypes.memmove(self.data, data, self.size)
|
|
self._dirty_min = 0
|
|
self._dirty_max = self.size
|
|
|
|
def set_data_region(self, data, start, length):
|
|
ctypes.memmove(self.data_ptr + start, data, length)
|
|
self._dirty_min = min(start, self._dirty_min)
|
|
self._dirty_max = max(start + length, self._dirty_max)
|
|
|
|
def map(self, invalidate=False):
|
|
self._dirty_min = 0
|
|
self._dirty_max = self.size
|
|
return self.data
|
|
|
|
def unmap(self):
|
|
pass
|
|
|
|
def get_region(self, start, size, ptr_type):
|
|
array = ctypes.cast(self.data_ptr + start, ptr_type).contents
|
|
return VertexBufferObjectRegion(self, start, start + size, array)
|
|
|
|
def resize(self, size):
|
|
data = (ctypes.c_byte * size)()
|
|
ctypes.memmove(data, self.data, min(size, self.size))
|
|
self.data = data
|
|
self.data_ptr = ctypes.cast(self.data, ctypes.c_void_p).value
|
|
|
|
self.size = size
|
|
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
|
|
glBindBuffer(self.target, self.id)
|
|
glBufferData(self.target, self.size, self.data, self.usage)
|
|
glPopClientAttrib()
|
|
|
|
self._dirty_min = sys.maxsize
|
|
self._dirty_max = 0
|
|
|
|
|
|
class AbstractBufferRegion:
|
|
"""A mapped region of a buffer.
|
|
|
|
Buffer regions are obtained using :py:meth:`~AbstractMappable.get_region`.
|
|
|
|
:Ivariables:
|
|
`array` : ctypes array
|
|
Array of data, of the type and count requested by
|
|
:py:meth:`~AbstractMappable.get_region`.
|
|
|
|
"""
|
|
|
|
def invalidate(self):
|
|
"""Mark this region as changed.
|
|
|
|
The buffer may not be updated with the latest contents of the
|
|
array until this method is called. (However, it may not be updated
|
|
until the next time the buffer is used, for efficiency).
|
|
"""
|
|
pass
|
|
|
|
|
|
class VertexBufferObjectRegion(AbstractBufferRegion):
|
|
"""A mapped region of a VBO."""
|
|
|
|
def __init__(self, buffer, start, end, array):
|
|
self.buffer = buffer
|
|
self.start = start
|
|
self.end = end
|
|
self.array = array
|
|
|
|
def invalidate(self):
|
|
buffer = self.buffer
|
|
buffer._dirty_min = min(buffer._dirty_min, self.start)
|
|
buffer._dirty_max = max(buffer._dirty_max, self.end)
|
|
|
|
|
|
class VertexArrayRegion(AbstractBufferRegion):
|
|
"""A mapped region of a vertex array.
|
|
|
|
The :py:meth:`~AbstractBufferRegion.invalidate` method is a no-op but is
|
|
provided in order to present a consistent interface with
|
|
:py:meth:`VertexBufferObjectRegion`.
|
|
"""
|
|
|
|
def __init__(self, array):
|
|
self.array = array
|
|
|
|
|
|
class IndirectArrayRegion(AbstractBufferRegion):
|
|
"""A mapped region in which data elements are not necessarily contiguous.
|
|
|
|
This region class is used to wrap buffer regions in which the data
|
|
must be accessed with some stride. For example, in an interleaved buffer
|
|
this region can be used to access a single interleaved component as if the
|
|
data was contiguous.
|
|
"""
|
|
|
|
def __init__(self, region, size, component_count, component_stride):
|
|
"""Wrap a buffer region.
|
|
|
|
Use the `component_count` and `component_stride` parameters to specify
|
|
the data layout of the encapsulated region. For example, if RGBA
|
|
data is to be accessed as if it were packed RGB, ``component_count``
|
|
would be set to 3 and ``component_stride`` to 4. If the region
|
|
contains 10 RGBA tuples, the ``size`` parameter is ``3 * 10 = 30``.
|
|
|
|
:Parameters:
|
|
`region` : `AbstractBufferRegion`
|
|
The region with interleaved data
|
|
`size` : int
|
|
The number of elements that this region will provide access to.
|
|
`component_count` : int
|
|
The number of elements that are contiguous before some must
|
|
be skipped.
|
|
`component_stride` : int
|
|
The number of elements of interleaved data separating
|
|
the contiguous sections.
|
|
|
|
"""
|
|
self.region = region
|
|
self.size = size
|
|
self.count = component_count
|
|
self.stride = component_stride
|
|
self.array = self
|
|
|
|
def __repr__(self):
|
|
return 'IndirectArrayRegion(size=%d, count=%d, stride=%d)' % (
|
|
self.size, self.count, self.stride)
|
|
|
|
def __getitem__(self, index):
|
|
count = self.count
|
|
if not isinstance(index, slice):
|
|
elem = index // count
|
|
j = index % count
|
|
return self.region.array[elem * self.stride + j]
|
|
|
|
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
|
|
data_step = step * self.stride
|
|
|
|
# TODO stepped getitem is probably wrong, see setitem for correct.
|
|
value_step = step * count
|
|
|
|
value = [0] * ((stop - start) // step)
|
|
stride = self.stride
|
|
for i in range(count):
|
|
value[i::value_step] = self.region.array[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
|
|
|
|
if step == 1:
|
|
data_step = self.stride
|
|
value_step = count
|
|
for i in range(count):
|
|
self.region.array[data_start + i:data_stop + i:data_step] = value[i::value_step]
|
|
else:
|
|
data_step = (step // count) * self.stride
|
|
self.region.array[data_start:data_stop:data_step] = value
|
|
|
|
def invalidate(self):
|
|
self.region.invalidate()
|