diff options
Diffstat (limited to 'silx/gui/plot/backends/glutils/GLSupport.py')
| -rw-r--r-- | silx/gui/plot/backends/glutils/GLSupport.py | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/silx/gui/plot/backends/glutils/GLSupport.py b/silx/gui/plot/backends/glutils/GLSupport.py new file mode 100644 index 0000000..3f473be --- /dev/null +++ b/silx/gui/plot/backends/glutils/GLSupport.py @@ -0,0 +1,192 @@ +# coding: utf-8 +# /*########################################################################## +# +# Copyright (c) 2014-2017 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): + 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.matrix(( + (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.float32) + + +def mat4Translate(x=0., y=0., z=0.): + """Translation matrix (row-major)""" + return numpy.matrix(( + (1., 0., 0., x), + (0., 1., 0., y), + (0., 0., 1., z), + (0., 0., 0., 1.)), dtype=numpy.float32) + + +def mat4Scale(sx=1., sy=1., sz=1.): + """Scale matrix (row-major)""" + return numpy.matrix(( + (sx, 0., 0., 0.), + (0., sy, 0., 0.), + (0., 0., sz, 0.), + (0., 0., 0., 1.)), dtype=numpy.float32) + + +def mat4Identity(): + """Identity matrix""" + return numpy.matrix(( + (1., 0., 0., 0.), + (0., 1., 0., 0.), + (0., 0., 1., 0.), + (0., 0., 0., 1.)), dtype=numpy.float32) |