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# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2014-2019 European Synchrotron Radiation Facility
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ############################################################################*/
"""This module provides classes wrapping OpenGL texture."""
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "03/04/2017"
from ctypes import c_void_p
import logging
import numpy
from ...._glutils import gl, Texture, numpyToGLType
_logger = logging.getLogger(__name__)
def _checkTexture2D(internalFormat, shape,
format_=None, type_=gl.GL_FLOAT, border=0):
"""Check if texture size with provided parameters is supported
:rtype: bool
"""
height, width = shape
gl.glTexImage2D(gl.GL_PROXY_TEXTURE_2D, 0, internalFormat,
width, height, border,
format_ or internalFormat,
type_, c_void_p(0))
width = gl.glGetTexLevelParameteriv(
gl.GL_PROXY_TEXTURE_2D, 0, gl.GL_TEXTURE_WIDTH)
return bool(width)
MIN_TEXTURE_SIZE = 64
def _getMaxSquareTexture2DSize(internalFormat=gl.GL_RGBA,
format_=None,
type_=gl.GL_FLOAT,
border=0):
"""Returns a supported size for a corresponding square texture
:returns: GL_MAX_TEXTURE_SIZE or a smaller supported size (not optimal)
:rtype: int
"""
# Is this useful?
maxTexSize = gl.glGetIntegerv(gl.GL_MAX_TEXTURE_SIZE)
while maxTexSize > MIN_TEXTURE_SIZE and \
not _checkTexture2D(internalFormat, (maxTexSize, maxTexSize),
format_, type_, border):
maxTexSize //= 2
return max(MIN_TEXTURE_SIZE, maxTexSize)
class Image(object):
"""Image of any size eventually using multiple textures or larger texture
"""
_WRAP = (gl.GL_CLAMP_TO_EDGE, gl.GL_CLAMP_TO_EDGE)
_MIN_FILTER = gl.GL_NEAREST
_MAG_FILTER = gl.GL_NEAREST
def __init__(self, internalFormat, data, format_=None, texUnit=0):
self.internalFormat = internalFormat
self.height, self.width = data.shape[0:2]
type_ = numpyToGLType(data.dtype)
if _checkTexture2D(internalFormat, data.shape[0:2], format_, type_):
texture = Texture(internalFormat,
data,
format_,
texUnit=texUnit,
minFilter=self._MIN_FILTER,
magFilter=self._MAG_FILTER,
wrap=self._WRAP)
vertices = numpy.array((
(0., 0., 0., 0.),
(self.width, 0., 1., 0.),
(0., self.height, 0., 1.),
(self.width, self.height, 1., 1.)), dtype=numpy.float32)
self.tiles = ((texture, vertices,
{'xOrigData': 0, 'yOrigData': 0,
'wData': self.width, 'hData': self.height}),)
else:
# Handle dimension too large: make tiles
maxTexSize = _getMaxSquareTexture2DSize(internalFormat,
format_, type_)
nCols = (self.width+maxTexSize-1) // maxTexSize
colWidths = [self.width // nCols] * nCols
colWidths[-1] += self.width % nCols
nRows = (self.height+maxTexSize-1) // maxTexSize
rowHeights = [self.height//nRows] * nRows
rowHeights[-1] += self.height % nRows
tiles = []
yOrig = 0
for hData in rowHeights:
xOrig = 0
for wData in colWidths:
if (hData < MIN_TEXTURE_SIZE or wData < MIN_TEXTURE_SIZE) \
and not _checkTexture2D(internalFormat,
(hData, wData),
format_,
type_):
# Ensure texture size is at least MIN_TEXTURE_SIZE
tH = max(hData, MIN_TEXTURE_SIZE)
tW = max(wData, MIN_TEXTURE_SIZE)
uMax, vMax = float(wData)/tW, float(hData)/tH
# TODO issue with type_ and alignment
texture = Texture(internalFormat,
data=None,
format_=format_,
shape=(tH, tW),
texUnit=texUnit,
minFilter=self._MIN_FILTER,
magFilter=self._MAG_FILTER,
wrap=self._WRAP)
# TODO handle unpack
texture.update(format_,
data[yOrig:yOrig+hData,
xOrig:xOrig+wData])
# texture.update(format_, type_, data,
# width=wData, height=hData,
# unpackRowLength=width,
# unpackSkipPixels=xOrig,
# unpackSkipRows=yOrig)
else:
uMax, vMax = 1, 1
# TODO issue with type_ and unpacking tiles
# TODO idea to handle unpack: use array strides
# As it is now, it will make a copy
texture = Texture(internalFormat,
data[yOrig:yOrig+hData,
xOrig:xOrig+wData],
format_,
texUnit=texUnit,
minFilter=self._MIN_FILTER,
magFilter=self._MAG_FILTER,
wrap=self._WRAP)
# TODO
# unpackRowLength=width,
# unpackSkipPixels=xOrig,
# unpackSkipRows=yOrig)
vertices = numpy.array((
(xOrig, yOrig, 0., 0.),
(xOrig + wData, yOrig, uMax, 0.),
(xOrig, yOrig + hData, 0., vMax),
(xOrig + wData, yOrig + hData, uMax, vMax)),
dtype=numpy.float32)
tiles.append((texture, vertices,
{'xOrigData': xOrig, 'yOrigData': yOrig,
'wData': wData, 'hData': hData}))
xOrig += wData
yOrig += hData
self.tiles = tuple(tiles)
def discard(self):
for texture, vertices, _ in self.tiles:
texture.discard()
del self.tiles
def updateAll(self, format_, data, texUnit=0):
if not hasattr(self, 'tiles'):
raise RuntimeError("No texture, discard has already been called")
assert data.shape[:2] == (self.height, self.width)
if len(self.tiles) == 1:
self.tiles[0][0].update(format_, data, texUnit=texUnit)
else:
for texture, _, info in self.tiles:
yOrig, xOrig = info['yOrigData'], info['xOrigData']
height, width = info['hData'], info['wData']
texture.update(format_,
data[yOrig:yOrig+height, xOrig:xOrig+width],
texUnit=texUnit)
# TODO check
# width=info['wData'], height=info['hData'],
# texUnit=texUnit, unpackAlign=unpackAlign,
# unpackRowLength=self.width,
# unpackSkipPixels=info['xOrigData'],
# unpackSkipRows=info['yOrigData'])
def render(self, posAttrib, texAttrib, texUnit=0):
try:
tiles = self.tiles
except AttributeError:
raise RuntimeError("No texture, discard has already been called")
for texture, vertices, _ in tiles:
texture.bind(texUnit)
stride = vertices.shape[-1] * vertices.itemsize
gl.glEnableVertexAttribArray(posAttrib)
gl.glVertexAttribPointer(posAttrib,
2,
gl.GL_FLOAT,
gl.GL_FALSE,
stride, vertices)
texCoordsPtr = c_void_p(vertices.ctypes.data +
2 * vertices.itemsize)
gl.glEnableVertexAttribArray(texAttrib)
gl.glVertexAttribPointer(texAttrib,
2,
gl.GL_FLOAT,
gl.GL_FALSE,
stride, texCoordsPtr)
gl.glDrawArrays(gl.GL_TRIANGLE_STRIP, 0, len(vertices))
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