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1 | """GLUT Input hook for interactive use with prompt_toolkit | |
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2 | """ | |
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3 | from __future__ import print_function | |
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4 | ||
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5 | ||
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6 | # GLUT is quite an old library and it is difficult to ensure proper | |
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7 | # integration within IPython since original GLUT does not allow to handle | |
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8 | # events one by one. Instead, it requires for the mainloop to be entered | |
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9 | # and never returned (there is not even a function to exit he | |
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10 | # mainloop). Fortunately, there are alternatives such as freeglut | |
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11 | # (available for linux and windows) and the OSX implementation gives | |
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12 | # access to a glutCheckLoop() function that blocks itself until a new | |
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13 | # event is received. This means we have to setup the idle callback to | |
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14 | # ensure we got at least one event that will unblock the function. | |
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15 | # | |
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16 | # Furthermore, it is not possible to install these handlers without a window | |
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17 | # being first created. We choose to make this window invisible. This means that | |
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18 | # display mode options are set at this level and user won't be able to change | |
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19 | # them later without modifying the code. This should probably be made available | |
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20 | # via IPython options system. | |
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21 | ||
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22 | import sys | |
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23 | import time | |
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24 | import signal | |
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25 | import OpenGL.GLUT as glut | |
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26 | import OpenGL.platform as platform | |
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27 | from timeit import default_timer as clock | |
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28 | ||
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29 | # Frame per second : 60 | |
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30 | # Should probably be an IPython option | |
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31 | glut_fps = 60 | |
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32 | ||
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33 | # Display mode : double buffeed + rgba + depth | |
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34 | # Should probably be an IPython option | |
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35 | glut_display_mode = (glut.GLUT_DOUBLE | | |
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36 | glut.GLUT_RGBA | | |
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37 | glut.GLUT_DEPTH) | |
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38 | ||
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39 | glutMainLoopEvent = None | |
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40 | if sys.platform == 'darwin': | |
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41 | try: | |
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42 | glutCheckLoop = platform.createBaseFunction( | |
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43 | 'glutCheckLoop', dll=platform.GLUT, resultType=None, | |
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44 | argTypes=[], | |
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45 | doc='glutCheckLoop( ) -> None', | |
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46 | argNames=(), | |
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47 | ) | |
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48 | except AttributeError: | |
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49 | raise RuntimeError( | |
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50 | '''Your glut implementation does not allow interactive sessions''' | |
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51 | '''Consider installing freeglut.''') | |
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52 | glutMainLoopEvent = glutCheckLoop | |
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53 | elif glut.HAVE_FREEGLUT: | |
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54 | glutMainLoopEvent = glut.glutMainLoopEvent | |
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55 | else: | |
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56 | raise RuntimeError( | |
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57 | '''Your glut implementation does not allow interactive sessions. ''' | |
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58 | '''Consider installing freeglut.''') | |
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59 | ||
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60 | ||
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61 | def glut_display(): | |
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62 | # Dummy display function | |
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63 | pass | |
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64 | ||
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65 | def glut_idle(): | |
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66 | # Dummy idle function | |
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67 | pass | |
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68 | ||
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69 | def glut_close(): | |
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70 | # Close function only hides the current window | |
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71 | glut.glutHideWindow() | |
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72 | glutMainLoopEvent() | |
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73 | ||
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74 | def glut_int_handler(signum, frame): | |
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75 | # Catch sigint and print the defaultipyt message | |
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76 | signal.signal(signal.SIGINT, signal.default_int_handler) | |
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77 | print('\nKeyboardInterrupt') | |
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78 | # Need to reprint the prompt at this stage | |
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79 | ||
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80 | # Initialisation code | |
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81 | glut.glutInit( sys.argv ) | |
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82 | glut.glutInitDisplayMode( glut_display_mode ) | |
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83 | # This is specific to freeglut | |
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84 | if bool(glut.glutSetOption): | |
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85 | glut.glutSetOption( glut.GLUT_ACTION_ON_WINDOW_CLOSE, | |
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86 | glut.GLUT_ACTION_GLUTMAINLOOP_RETURNS ) | |
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87 | glut.glutCreateWindow( b'ipython' ) | |
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88 | glut.glutReshapeWindow( 1, 1 ) | |
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89 | glut.glutHideWindow( ) | |
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90 | glut.glutWMCloseFunc( glut_close ) | |
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91 | glut.glutDisplayFunc( glut_display ) | |
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92 | glut.glutIdleFunc( glut_idle ) | |
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93 | ||
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94 | ||
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95 | def inputhook(context): | |
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96 | """Run the pyglet event loop by processing pending events only. | |
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97 | ||
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98 | This keeps processing pending events until stdin is ready. After | |
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99 | processing all pending events, a call to time.sleep is inserted. This is | |
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100 | needed, otherwise, CPU usage is at 100%. This sleep time should be tuned | |
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101 | though for best performance. | |
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102 | """ | |
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103 | # We need to protect against a user pressing Control-C when IPython is | |
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104 | # idle and this is running. We trap KeyboardInterrupt and pass. | |
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105 | ||
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106 | signal.signal(signal.SIGINT, glut_int_handler) | |
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107 | ||
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108 | try: | |
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109 | t = clock() | |
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110 | ||
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111 | # Make sure the default window is set after a window has been closed | |
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112 | if glut.glutGetWindow() == 0: | |
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113 | glut.glutSetWindow( 1 ) | |
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114 | glutMainLoopEvent() | |
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115 | return 0 | |
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116 | ||
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117 | while not context.input_is_ready(): | |
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118 | glutMainLoopEvent() | |
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119 | # We need to sleep at this point to keep the idle CPU load | |
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120 | # low. However, if sleep to long, GUI response is poor. As | |
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121 | # a compromise, we watch how often GUI events are being processed | |
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122 | # and switch between a short and long sleep time. Here are some | |
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123 | # stats useful in helping to tune this. | |
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124 | # time CPU load | |
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125 | # 0.001 13% | |
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126 | # 0.005 3% | |
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127 | # 0.01 1.5% | |
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128 | # 0.05 0.5% | |
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129 | used_time = clock() - t | |
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130 | if used_time > 10.0: | |
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131 | # print 'Sleep for 1 s' # dbg | |
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132 | time.sleep(1.0) | |
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133 | elif used_time > 0.1: | |
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134 | # Few GUI events coming in, so we can sleep longer | |
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135 | # print 'Sleep for 0.05 s' # dbg | |
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136 | time.sleep(0.05) | |
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137 | else: | |
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138 | # Many GUI events coming in, so sleep only very little | |
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139 | time.sleep(0.001) | |
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140 | except KeyboardInterrupt: | |
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141 | pass |
@@ -1,51 +1,51 b'' | |||
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1 | 1 | #!/usr/bin/env python |
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2 | 2 | """Simple GLUT example to manually test event loop integration. |
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3 | 3 | |
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4 | 4 | This is meant to run tests manually in ipython as: |
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5 | 5 | |
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6 | 6 | In [5]: %gui glut |
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7 | 7 | |
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8 | 8 | In [6]: %run gui-glut.py |
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9 | 9 | |
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10 | 10 | In [7]: gl.glClearColor(1,1,1,1) |
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11 | 11 | """ |
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12 | 12 | |
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13 | 13 | #!/usr/bin/env python |
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14 | 14 | import sys |
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15 | 15 | import OpenGL.GL as gl |
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16 | 16 | import OpenGL.GLUT as glut |
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17 | 17 | |
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18 | 18 | def close(): |
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19 | 19 | glut.glutDestroyWindow(glut.glutGetWindow()) |
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20 | 20 | |
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21 | 21 | def display(): |
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22 | 22 | gl.glClear (gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT) |
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23 | 23 | glut.glutSwapBuffers() |
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24 | 24 | |
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25 | 25 | def resize(width,height): |
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26 | 26 | gl.glViewport(0, 0, width, height+4) |
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27 | 27 | gl.glMatrixMode(gl.GL_PROJECTION) |
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28 | 28 | gl.glLoadIdentity() |
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29 | 29 | gl.glOrtho(0, width, 0, height+4, -1, 1) |
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30 | 30 | gl.glMatrixMode(gl.GL_MODELVIEW) |
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31 | 31 | |
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32 | 32 | if glut.glutGetWindow() > 0: |
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33 | 33 | interactive = True |
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34 | 34 | glut.glutInit(sys.argv) |
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35 | 35 | glut.glutInitDisplayMode(glut.GLUT_DOUBLE | |
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36 | 36 | glut.GLUT_RGBA | |
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37 | 37 | glut.GLUT_DEPTH) |
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38 | 38 | else: |
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39 | 39 | interactive = False |
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40 | 40 | |
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41 | glut.glutCreateWindow('gui-glut') | |
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41 | glut.glutCreateWindow(b'gui-glut') | |
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42 | 42 | glut.glutDisplayFunc(display) |
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43 | 43 | glut.glutReshapeFunc(resize) |
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44 | 44 | # This is necessary on osx to be able to close the window |
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45 | 45 | # (else the close button is disabled) |
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46 | 46 | if sys.platform == 'darwin' and not bool(glut.HAVE_FREEGLUT): |
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47 | 47 | glut.glutWMCloseFunc(close) |
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48 | 48 | gl.glClearColor(0,0,0,1) |
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49 | 49 | |
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50 | 50 | if not interactive: |
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51 | 51 | glut.glutMainLoop() |
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