# vim: set nosta noet ts=4 sw=4:
#
# Split a single frame into 100 separate pieces, for blender network
# rendering.
#
# Assumptions:
# 	- Shared storage between all render nodes.
# 	- A method for simultaneous blender execution on all nodes (even
# 	  just ssh)
#   - Re-constituting the image performed out of band (most easily with
#     ImageMagick toolset)
#
# Copy this script into the same directory as your blend file, then run
# like so across your render farm:
#
#    blender file.blend -b -P chunked_render.py
#
# When all nodes are finished rendering their chunks, you'll have 100
# separate images.  Combine them back into a single image like so, if
# you have ImageMagick installed:
#
#   montage -background none -mode concatenate -tile 10x10 chunk_* rendered.jpg
#
# Authors:
#
# Mahlon E. Smith <mahlon@martini.nu> and
# Justin Smith <justin@statisticool.com>
#
# License:
#
# Copyright (c) 2016, Mahlon E. Smith <mahlon@martini.nu>
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#
#     * Neither the name of Mahlon E. Smith nor the names of his
#       contributors may be used to endorse or promote products derived
#       from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


import bpy
import os
import math

tiles = 100
t_sqr = math.sqrt( tiles )

bpy.ops.wm.addon_enable( module='render_auto_tile_size' )

s = bpy.context.scene
r = s.render

s.ats_settings.is_enabled  = True
s.ats_settings.use_optimal = True

r.use_border         = True
r.use_crop_to_border = True
r.threads_mode       = 'AUTO'

count = 0
for row in range( 1, 11 ):
	for column in range( 1, 11 ):
		count       = count + 1
		filepath    = "chunk_%04d" % count
		placeholder = "." + filepath
		r.filepath  = "//%s" % filepath

		if not os.path.isfile( placeholder ):
			print( "Working on chunk %d (row %d, column %d)" % (count, row, column) )
			placeholder = open( placeholder, 'w')
			placeholder.close

			r.border_min_x = ( column - 1 ) / t_sqr
			r.border_max_x = column / t_sqr
			r.border_min_y = ( t_sqr - row ) / t_sqr
			r.border_max_y = ( t_sqr - row + 1 ) / t_sqr

			bpy.ops.render.render( write_still=True )

		else:
			print( "Another worker already on %s, skipping." % filepath )