# /*######################################################################### # # The PyMca X-Ray Fluorescence Toolkit # # Copyright (c) 2004-2014 European Synchrotron Radiation Facility # # This file is part of the PyMca X-ray Fluorescence Toolkit developed at # the ESRF by the Software group. # # 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. # # ###########################################################################*/ __author__ = "T. Vincent - ESRF Data Analysis" __contact__ = "thomas.vincent@esrf.fr" __license__ = "MIT" __copyright__ = "European Synchrotron Radiation Facility, Grenoble, France" __doc__ = """ This module provides convenient classes and functions for OpenGL rendering. """ # import ###################################################################### import numpy as np from .gl import * # noqa # utils ####################################################################### def clamp(value, min_=0., max_=1.): if value < min_: return min_ elif value > max_: return max_ else: return value def rgba(color, colorDict={}): """Convert color code '#RRGGBB' and '#RRGGBBAA' to (R, G, B, A) :param str code: The color code to conver :param dict colorDict: A dictionary of color name conversion to color code :returns: RGBA colors as floats in [0., 1.] :rtype: tuple """ if len(color) == 4: r, g, b, a = color if type(color[3]) in [type(1), np.uint8, np.int8]: return r / 255., g / 255., b / 255., a / 255. if type(color[3]) in [type(1.), np.float32, np.float64]: assert r >= 0. and r <= 1. assert g >= 0. and g <= 1. assert b >= 0. and b <= 1. assert a >= 0. and a <= 1. return r, g, b, a # We assume color is a string if not color.startswith('#'): color = colorDict[color] assert len(color) in (7, 9) and color[0] == '#' r = int(color[1:3], 16) / 255. g = int(color[3:5], 16) / 255. b = int(color[5:7], 16) / 255. a = int(color[7:9], 16) / 255. if len(color) == 9 else 1. return r, g, b, a # Float 32 info ############################################################### # Using min/max value below limits of float32 # so operation with such value (e.g., max - min) do not overflow FLOAT32_SAFE_MIN = -1e37 FLOAT32_MINPOS = np.finfo(np.float32).tiny FLOAT32_SAFE_MAX = 1e37 # shape2D ##################################################################### def buildFillMaskIndices(nIndices): if nIndices <= np.iinfo(np.uint16).max + 1: dtype = np.uint16 else: dtype = np.uint32 lastIndex = nIndices - 1 splitIndex = lastIndex // 2 + 1 indices = np.empty(nIndices, dtype=dtype) indices[::2] = np.arange(0, splitIndex, step=1, dtype=dtype) indices[1::2] = np.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 = np.array(points, dtype=np.float32, copy=False) self.strokeClosed = strokeClosed self._indices = buildFillMaskIndices(len(self.vertices)) tVertex = np.transpose(self.vertices) xMin, xMax = min(tVertex[0]), max(tVertex[0]) yMin, yMax = min(tVertex[1]), max(tVertex[1]) self.bboxVertices = np.array(((xMin, yMin), (xMin, yMax), (xMax, yMin), (xMax, yMax)), dtype=np.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): glEnableVertexAttribArray(posAttrib) glVertexAttribPointer(posAttrib, 2, GL_FLOAT, GL_FALSE, 0, self.vertices) glEnable(GL_STENCIL_TEST) glStencilMask(1) glStencilFunc(GL_ALWAYS, 1, 1) glStencilOp(GL_INVERT, GL_INVERT, GL_INVERT) glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE) glDepthMask(GL_FALSE) glDrawElements(GL_TRIANGLE_STRIP, len(self._indices), GL_UNSIGNED_SHORT, self._indices) glStencilFunc(GL_EQUAL, 1, 1) glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO) # Reset stencil while drawing glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE) glDepthMask(GL_TRUE) def renderFill(self, posAttrib): self.prepareFillMask(posAttrib) glVertexAttribPointer(posAttrib, 2, GL_FLOAT, GL_FALSE, 0, self.bboxVertices) glDrawArrays(GL_TRIANGLE_STRIP, 0, len(self.bboxVertices)) glDisable(GL_STENCIL_TEST) def renderStroke(self, posAttrib): glEnableVertexAttribArray(posAttrib) glVertexAttribPointer(posAttrib, 2, GL_FLOAT, GL_FALSE, 0, self.vertices) glLineWidth(1) drawMode = GL_LINE_LOOP if self.strokeClosed else GL_LINE_STRIP 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: glUniform4f(colorUnif, *self.fillColor) step = self._HATCH_STEP if self.fill == 'hatch' else self._NO_HATCH glUniform1i(hatchStepUnif, step) self.renderFill(posAttrib) if self.stroke: glUniform4f(colorUnif, *self.strokeColor) glUniform1i(hatchStepUnif, self._NO_HATCH) self.renderStroke(posAttrib) # matrix ###################################################################### def mat4Ortho(left, right, bottom, top, near, far): """Orthographic projection matrix (row-major)""" return np.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=np.float32) def mat4Translate(x=0., y=0., z=0.): """Translation matrix (row-major)""" return np.matrix(( (1., 0., 0., x), (0., 1., 0., y), (0., 0., 1., z), (0., 0., 0., 1.)), dtype=np.float32) def mat4Scale(sx=1., sy=1., sz=1.): """Scale matrix (row-major)""" return np.matrix(( (sx, 0., 0., 0.), (0., sy, 0., 0.), (0., 0., sz, 0.), (0., 0., 0., 1.)), dtype=np.float32) def mat4Identity(): """Identity matrix""" return np.matrix(( (1., 0., 0., 0.), (0., 1., 0., 0.), (0., 0., 1., 0.), (0., 0., 0., 1.)), dtype=np.float32)