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viewport.py
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viewport.py
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from time import time
from ..bin import pyluxcore
from .. import export
from ..draw.viewport import FrameBuffer
from .. import utils
from ..utils import render as utils_render
from ..utils.errorlog import LuxCoreErrorLog
from ..export.config import convert_viewport_engine
# Executed in separate thread
def start_session(engine):
try:
engine.session.Start()
engine.viewport_start_time = time()
except ReferenceError:
# Could not start render session because RenderEngine struct was deleted (caused
# by the user cancelling the viewport render before this function is called)
return
except Exception as error:
engine.session = None
# Reset the exporter to invalidate all caches
engine.exporter = None
engine.update_stats("Error: ", str(error))
LuxCoreErrorLog.add_error(error)
import traceback
traceback.print_exc()
# Note: Due to CPython implementation details, it's not necessary to use a lock here (this modification is atomic)
engine.starting_session = False
def view_update(engine, context, depsgraph, changes=None):
start = time()
if engine.starting_session or engine.viewport_fatal_error:
# Prevent deadlock
return
LuxCoreErrorLog.clear(force_ui_update=False)
if engine.session is None:
if not engine.viewport_starting_message_shown:
# Let one engine.view_draw() happen so it shows a message in the UI
return
try:
print("=" * 50)
print("[Engine/Viewport] New session")
engine.exporter = export.Exporter()
engine.session = engine.exporter.create_session(depsgraph, context, engine=engine)
# Start in separate thread to avoid blocking the UI
engine.starting_session = True
import _thread
_thread.start_new_thread(start_session, (engine,))
except Exception as error:
del engine.session
engine.session = None
# Reset the exporter to invalidate all caches
engine.exporter = None
engine.viewport_fatal_error = str(error)
engine.update_stats("Error: ", str(error))
LuxCoreErrorLog.add_error(error)
import traceback
traceback.print_exc()
return
s = time()
changes = engine.exporter.get_changes(depsgraph, context, changes)
print("view_update(): checking for changes took %.1f ms" % ((time() - s) * 1000))
if changes:
s = time()
# We have to re-assign the session because it might have been replaced due to filmsize change
engine.session = engine.exporter.update(depsgraph, context, engine.session, changes)
engine.viewport_start_time = time()
if engine.framebuffer:
engine.framebuffer.reset_denoiser()
print("view_update(): applying changes took %.1f ms" % ((time() - s) * 1000))
print("view_update() took %.1f ms" % ((time() - start) * 1000))
def view_draw(engine, context, depsgraph):
scene = depsgraph.scene_eval
if engine.starting_session:
engine.tag_redraw()
return
if engine.viewport_fatal_error:
engine.update_stats("Error:", engine.viewport_fatal_error)
engine.tag_redraw()
return
if engine.session is None:
config = scene.luxcore.config
definitions = {}
luxcore_engine, _ = convert_viewport_engine(context, scene, definitions, config)
message = ""
if luxcore_engine.endswith("OCL"):
# Create dummy renderconfig to check if we have to compile OpenCL kernels
luxcore_scene = pyluxcore.Scene()
definitions = {
"scene.camera.type": "perspective",
}
luxcore_scene.Parse(utils.create_props("", definitions))
devices = scene.luxcore.devices
definitions = {
"renderengine.type": "RTPATHOCL",
"sampler.type": "TILEPATHSAMPLER",
"scene.epsilon.min": config.min_epsilon,
"scene.epsilon.max": config.max_epsilon,
"opencl.devices.select": devices.devices_to_selection_string(),
}
config_props = utils.create_props("", definitions)
renderconfig = pyluxcore.RenderConfig(config_props, luxcore_scene)
if not renderconfig.HasCachedKernels():
gpu_backend = utils.get_addon_preferences(context).gpu_backend
message = f"Compiling {gpu_backend} kernels (just once, takes a few minutes)"
engine.update_stats("Starting viewport render", message)
engine.viewport_starting_message_shown = True
engine.tag_update()
engine.tag_redraw()
return
if not engine.framebuffer or engine.framebuffer.needs_replacement(context, scene):
engine.framebuffer = FrameBuffer(engine, context, scene)
framebuffer = engine.framebuffer
# Check for changes because some actions in Blender (e.g. moving the viewport
# camera) do not trigger a view_update() call, but only a view_draw() call.
changes = engine.exporter.get_viewport_changes(depsgraph, context)
if changes & export.Change.REQUIRES_VIEW_UPDATE:
engine.tag_redraw()
view_update(engine, context, depsgraph, changes)
return
elif changes & export.Change.CAMERA:
# Only update in view_draw if it is a camera update,
# for everything else we call view_update().
# We have to re-assign the session because it might have been
# replaced due to filmsize change.
engine.session = engine.exporter.update(depsgraph, context, engine.session, export.Change.CAMERA)
engine.viewport_start_time = time()
if utils.in_material_shading_mode(context):
if not engine.session.IsInPause():
engine.session.WaitNewFrame()
engine.session.UpdateStats()
framebuffer.update(engine.session, scene)
engine.update_stats("", "")
stats = engine.session.GetStats()
samples = stats.Get("stats.renderengine.pass").GetInt()
if samples >= 5:
print("[Engine/Viewport] Pausing session")
engine.session.Pause()
else:
engine.tag_redraw()
framebuffer.draw(engine, context, scene)
return
# Check if we need to pause the viewport render
# (note: the LuxCore stat "stats.renderengine.time" is not reliable here)
rendered_time = time() - engine.viewport_start_time
halt_time = scene.luxcore.viewport.halt_time
status_message = ""
if rendered_time > halt_time:
if not engine.session.IsInPause():
print("[Engine/Viewport] Pausing session")
engine.session.Pause()
status_message = "(Paused)"
if framebuffer.denoiser_result_cached:
status_message = "(Paused, Denoiser Done)"
else:
if framebuffer.is_denoiser_active():
if framebuffer.is_denoiser_done():
status_message = "(Paused, Denoiser Done)"
framebuffer.load_denoiser_result(scene)
else:
status_message = "(Paused, Denoiser Working ...)"
engine.tag_redraw()
elif context.scene.luxcore.viewport.get_denoiser(context) == "OIDN":
try:
framebuffer.start_denoiser(engine.session)
engine.tag_redraw()
except Exception as error:
status_message = "Could not start denoiser: %s" % error
else:
# Not in pause yet, keep drawing
engine.session.WaitNewFrame()
try:
engine.session.UpdateStats()
except RuntimeError as error:
print("[Engine/Viewport] Error during UpdateStats():", error)
framebuffer.update(engine.session, scene)
framebuffer.reset_denoiser()
engine.tag_redraw()
framebuffer.draw(engine, context, scene)
# Show formatted statistics in Blender UI
config = engine.session.GetRenderConfig()
stats = engine.session.GetStats()
pretty_stats = utils_render.get_pretty_stats(config, stats, scene, context)
engine.update_stats(pretty_stats, status_message)