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# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2014-2018 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 convenient classes and functions for OpenGL rendering.
"""
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "03/04/2017"
import numpy
from ...._glutils import gl
def buildFillMaskIndices(nIndices, dtype=None):
"""Returns triangle strip indices for rendering a filled polygon mask
:param int nIndices: Number of points
:param Union[numpy.dtype,None] dtype:
If specified the dtype of the returned indices array
:return: 1D array of indices constructing a triangle strip
:rtype: numpy.ndarray
"""
if dtype is None:
if nIndices <= numpy.iinfo(numpy.uint16).max + 1:
dtype = numpy.uint16
else:
dtype = numpy.uint32
lastIndex = nIndices - 1
splitIndex = lastIndex // 2 + 1
indices = numpy.empty(nIndices, dtype=dtype)
indices[::2] = numpy.arange(0, splitIndex, step=1, dtype=dtype)
indices[1::2] = numpy.arange(lastIndex, splitIndex - 1, step=-1,
dtype=dtype)
return indices
class Shape2D(object):
_NO_HATCH = 0
_HATCH_STEP = 20
def __init__(self, points, fill='solid', stroke=True,
fillColor=(0., 0., 0., 1.), strokeColor=(0., 0., 0., 1.),
strokeClosed=True):
self.vertices = numpy.array(points, dtype=numpy.float32, copy=False)
self.strokeClosed = strokeClosed
self._indices = buildFillMaskIndices(len(self.vertices))
tVertex = numpy.transpose(self.vertices)
xMin, xMax = min(tVertex[0]), max(tVertex[0])
yMin, yMax = min(tVertex[1]), max(tVertex[1])
self.bboxVertices = numpy.array(((xMin, yMin), (xMin, yMax),
(xMax, yMin), (xMax, yMax)),
dtype=numpy.float32)
self._xMin, self._xMax = xMin, xMax
self._yMin, self._yMax = yMin, yMax
self.fill = fill
self.fillColor = fillColor
self.stroke = stroke
self.strokeColor = strokeColor
@property
def xMin(self):
return self._xMin
@property
def xMax(self):
return self._xMax
@property
def yMin(self):
return self._yMin
@property
def yMax(self):
return self._yMax
def prepareFillMask(self, posAttrib):
gl.glEnableVertexAttribArray(posAttrib)
gl.glVertexAttribPointer(posAttrib,
2,
gl.GL_FLOAT,
gl.GL_FALSE,
0, self.vertices)
gl.glEnable(gl.GL_STENCIL_TEST)
gl.glStencilMask(1)
gl.glStencilFunc(gl.GL_ALWAYS, 1, 1)
gl.glStencilOp(gl.GL_INVERT, gl.GL_INVERT, gl.GL_INVERT)
gl.glColorMask(gl.GL_FALSE, gl.GL_FALSE, gl.GL_FALSE, gl.GL_FALSE)
gl.glDepthMask(gl.GL_FALSE)
gl.glDrawElements(gl.GL_TRIANGLE_STRIP, len(self._indices),
gl.GL_UNSIGNED_SHORT, self._indices)
gl.glStencilFunc(gl.GL_EQUAL, 1, 1)
# Reset stencil while drawing
gl.glStencilOp(gl.GL_ZERO, gl.GL_ZERO, gl.GL_ZERO)
gl.glColorMask(gl.GL_TRUE, gl.GL_TRUE, gl.GL_TRUE, gl.GL_TRUE)
gl.glDepthMask(gl.GL_TRUE)
def renderFill(self, posAttrib):
self.prepareFillMask(posAttrib)
gl.glVertexAttribPointer(posAttrib,
2,
gl.GL_FLOAT,
gl.GL_FALSE,
0, self.bboxVertices)
gl.glDrawArrays(gl.GL_TRIANGLE_STRIP, 0, len(self.bboxVertices))
gl.glDisable(gl.GL_STENCIL_TEST)
def renderStroke(self, posAttrib):
gl.glEnableVertexAttribArray(posAttrib)
gl.glVertexAttribPointer(posAttrib,
2,
gl.GL_FLOAT,
gl.GL_FALSE,
0, self.vertices)
gl.glLineWidth(1)
drawMode = gl.GL_LINE_LOOP if self.strokeClosed else gl.GL_LINE_STRIP
gl.glDrawArrays(drawMode, 0, len(self.vertices))
def render(self, posAttrib, colorUnif, hatchStepUnif):
assert self.fill in ['hatch', 'solid', None]
if self.fill is not None:
gl.glUniform4f(colorUnif, *self.fillColor)
step = self._HATCH_STEP if self.fill == 'hatch' else self._NO_HATCH
gl.glUniform1i(hatchStepUnif, step)
self.renderFill(posAttrib)
if self.stroke:
gl.glUniform4f(colorUnif, *self.strokeColor)
gl.glUniform1i(hatchStepUnif, self._NO_HATCH)
self.renderStroke(posAttrib)
# matrix ######################################################################
def mat4Ortho(left, right, bottom, top, near, far):
"""Orthographic projection matrix (row-major)"""
return numpy.array((
(2./(right - left), 0., 0., -(right+left)/float(right-left)),
(0., 2./(top - bottom), 0., -(top+bottom)/float(top-bottom)),
(0., 0., -2./(far-near), -(far+near)/float(far-near)),
(0., 0., 0., 1.)), dtype=numpy.float64)
def mat4Translate(x=0., y=0., z=0.):
"""Translation matrix (row-major)"""
return numpy.array((
(1., 0., 0., x),
(0., 1., 0., y),
(0., 0., 1., z),
(0., 0., 0., 1.)), dtype=numpy.float64)
def mat4Scale(sx=1., sy=1., sz=1.):
"""Scale matrix (row-major)"""
return numpy.array((
(sx, 0., 0., 0.),
(0., sy, 0., 0.),
(0., 0., sz, 0.),
(0., 0., 0., 1.)), dtype=numpy.float64)
def mat4Identity():
"""Identity matrix"""
return numpy.array((
(1., 0., 0., 0.),
(0., 1., 0., 0.),
(0., 0., 1., 0.),
(0., 0., 0., 1.)), dtype=numpy.float64)
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