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/*
* Copyright 2011-2021 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "integrator/work_tile_scheduler.h"
#include "device/device_queue.h"
#include "integrator/tile.h"
#include "render/buffers.h"
#include "util/util_atomic.h"
#include "util/util_logging.h"
CCL_NAMESPACE_BEGIN
WorkTileScheduler::WorkTileScheduler()
{
}
void WorkTileScheduler::set_max_num_path_states(int max_num_path_states)
{
max_num_path_states_ = max_num_path_states;
}
void WorkTileScheduler::reset(const BufferParams &buffer_params, int sample_start, int samples_num)
{
/* Image buffer parameters. */
image_full_offset_px_.x = buffer_params.full_x;
image_full_offset_px_.y = buffer_params.full_y;
image_size_px_ = make_int2(buffer_params.width, buffer_params.height);
offset_ = buffer_params.offset;
stride_ = buffer_params.stride;
/* Samples parameters. */
sample_start_ = sample_start;
samples_num_ = samples_num;
/* Initialize new scheduling. */
reset_scheduler_state();
}
void WorkTileScheduler::reset_scheduler_state()
{
tile_size_ = tile_calculate_best_size(image_size_px_, samples_num_, max_num_path_states_);
VLOG(3) << "Will schedule tiles of size " << tile_size_;
if (VLOG_IS_ON(3)) {
/* The logging is based on multiple tiles scheduled, ignoring overhead of multi-tile scheduling
* and purely focusing on the number of used path states. */
const int num_path_states_in_tile = tile_size_.width * tile_size_.height *
tile_size_.num_samples;
const int num_tiles = max_num_path_states_ / num_path_states_in_tile;
VLOG(3) << "Number of unused path states: "
<< max_num_path_states_ - num_tiles * num_path_states_in_tile;
}
num_tiles_x_ = divide_up(image_size_px_.x, tile_size_.width);
num_tiles_y_ = divide_up(image_size_px_.y, tile_size_.height);
total_tiles_num_ = num_tiles_x_ * num_tiles_y_;
num_tiles_per_sample_range_ = divide_up(samples_num_, tile_size_.num_samples);
next_work_index_ = 0;
total_work_size_ = total_tiles_num_ * num_tiles_per_sample_range_;
}
bool WorkTileScheduler::get_work(KernelWorkTile *work_tile_, const int max_work_size)
{
/* Note that the `max_work_size` can be higher than the `max_num_path_states_`: this is because
* the path trace work can decide to use smaller tile sizes and greedily schedule multiple tiles,
* improving overall device occupancy.
* So the `max_num_path_states_` is a "scheduling unit", and the `max_work_size` is a "scheduling
* limit". */
DCHECK_NE(max_num_path_states_, 0);
const int work_index = atomic_fetch_and_add_int32(&next_work_index_, 1);
if (work_index >= total_work_size_) {
return false;
}
const int sample_range_index = work_index % num_tiles_per_sample_range_;
const int start_sample = sample_range_index * tile_size_.num_samples;
const int tile_index = work_index / num_tiles_per_sample_range_;
const int tile_y = tile_index / num_tiles_x_;
const int tile_x = tile_index - tile_y * num_tiles_x_;
KernelWorkTile work_tile;
work_tile.x = tile_x * tile_size_.width;
work_tile.y = tile_y * tile_size_.height;
work_tile.w = tile_size_.width;
work_tile.h = tile_size_.height;
work_tile.start_sample = sample_start_ + start_sample;
work_tile.num_samples = min(tile_size_.num_samples, samples_num_ - start_sample);
work_tile.offset = offset_;
work_tile.stride = stride_;
work_tile.w = min(work_tile.w, image_size_px_.x - work_tile.x);
work_tile.h = min(work_tile.h, image_size_px_.y - work_tile.y);
work_tile.x += image_full_offset_px_.x;
work_tile.y += image_full_offset_px_.y;
const int tile_work_size = work_tile.w * work_tile.h * work_tile.num_samples;
DCHECK_GT(tile_work_size, 0);
if (max_work_size && tile_work_size > max_work_size) {
/* The work did not fit into the requested limit of the work size. Unschedule the tile,
* allowing others (or ourselves later one) to pick it up.
*
* TODO: Such temporary decrement is not ideal, since it might lead to situation when another
* device sees there is nothing to be done, finishing its work and leaving all work to be
* done by us. */
atomic_fetch_and_add_int32(&next_work_index_, -1);
return false;
}
*work_tile_ = work_tile;
return true;
}
CCL_NAMESPACE_END
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