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annotate blender/time_sync/blender_time.py @ 2457:d94480bfb179

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more work on blender time sync. Might be working, aside from blender play-button
author drewp@bigasterisk.com
date Tue, 20 May 2025 13:48:07 -0700
parents 2d454737a916
children
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1 from dataclasses import dataclass
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2 from typing import Callable
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3
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4 import bpy
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5 from bpy.app.handlers import persistent
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6
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7 from light9.run_local import log
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8 from light9.ascoltami.play_state import AscoPlayState
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9
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10 UPDATE_PERIOD = 1 / 20
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11
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12
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13 def clamp(lo, hi, x):
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14 return max(lo, min(hi, x))
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15
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16
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17 class _TimeEvent():
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18 pass
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19
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20
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21 class SceneLoaded(_TimeEvent):
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22 pass
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23
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24
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25 @dataclass
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26 class PausedGotoTime(_TimeEvent):
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27 t: float
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28
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29
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30 @dataclass
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31 class PlayingGotoTime(_TimeEvent):
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32 t: float
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33
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34
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35 @dataclass
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36 class BlenderPlayState:
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37 isAnimationPlaying: bool
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38 isScrubbing: bool
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39
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40
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41 class BlenderTime:
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42 """all methods to run in main thread"""
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43
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44 def __init__(self, onEvent: Callable[[_TimeEvent], None], ascoltamiPlayStateRO: AscoPlayState):
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45 self.ascoltamiPlayStateRO = ascoltamiPlayStateRO
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46 self._onEvent = onEvent
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47 self.lastSetFrame = -1
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48 self.lastPlayState = BlenderPlayState(False, False)
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49 self.loaded = False
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50 self.curFrameDirty = True
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51 self.durationDirty = True
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52
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53 def start(self):
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54 bpy.app.handlers.load_post.append(self._on_load_post)
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55 bpy.app.handlers.frame_change_post.append(self._on_frame_change_post)
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56
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57 # need persistent because `blender --addons ...` seems to start addon
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58 # before loading scene.
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59 bpy.app.timers.register(self._update, persistent=True)
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60
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61 self._emitEvent(SceneLoaded())
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62
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63 def setSceneDuration(self, duration: float):
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64 if not self.loaded:
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65 return
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66 self.duration = duration
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67 scene = bpy.context.scene
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68 fps = scene.render.fps
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69 scene.frame_start = 0
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70 scene.frame_end = int(duration * fps)
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71
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72 def frameDuration(self):
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73 """press Home on the timeline to frame the whole range"""
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74 return
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75 # todo: need to be in screen context or something
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76 context_override = bpy.context.copy()
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77 # context_override["selected_objects"] = list(context.scene.objects)
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78 with bpy.context.temp_override(**context_override):
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79 bpy.ops.action.view_all()
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80
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81 def setCurrentTime(self, t: float):
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82 if not self.loaded:
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83 return
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84 scene = bpy.context.scene
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85 fps = scene.render.fps
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86 fr = int(clamp(t * fps, 0, scene.frame_end))
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87 self.lastSetFrame = fr
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88 scene.frame_set(fr)
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89
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90 def setRange(self, duration: float):
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91 self.setSceneDuration(duration)
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92 self.frameDuration()
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93
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94 def _emitEvent(self, event: _TimeEvent):
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95 # log.info(f'🌹 emitEvent {event}')
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96 self._onEvent(event)
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97
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98 @persistent
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99 def _update(self):
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100 if self.curFrameDirty or self.ascoltamiPlayStateRO.playing:
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101 self._followAscoTime()
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102 self.curFrameDirty=False
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103 if self.durationDirty:
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104 if (d := self.ascoltamiPlayStateRO.duration) is not None:
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105 self.setRange(d)
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106 self.durationDirty = False
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107 # # todo: playing in blender should start ascoltami playback
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108 # cur = BlenderPlayState(bpy.context.screen.is_animation_playing, bpy.context.screen.is_scrubbing)
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109
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110 return UPDATE_PERIOD
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111
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112 def _followAscoTime(self):
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113 if (t := self.ascoltamiPlayStateRO.getCurrentSongTime()) is not None:
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114 self.setCurrentTime(t)
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115
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116 @persistent
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117 def _on_load_post(self, scene, deps):
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118 self._emitEvent(SceneLoaded())
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119 self.loaded = True
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120 self.curFrameDirty = True
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121
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122 @persistent
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123 def _on_frame_change_post(self, scene, deps):
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124 # log.info(f' _on_frame_change_post {self.lastPlayState}')
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125 if scene.frame_current == self.lastSetFrame:
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126 return
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127 # blender requested this frame change, either playing or paused (scrubbing timeline)
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128 self.lastSetFrame = scene.frame_current
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129 t = round(scene.frame_current / scene.render.fps, 3)
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130 if self.lastPlayState.isAnimationPlaying and not self.lastPlayState.isScrubbing:
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131 self._emitEvent(PlayingGotoTime(t=t))
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132 else:
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133 self._emitEvent(PausedGotoTime(t=t))