From fc5be0b59883c28d5d0702acb96dc3d72295dda8 Mon Sep 17 00:00:00 2001 From: Manuel Castilla Date: Tue, 6 Jul 2021 16:16:08 +0200 Subject: Compositor: Constant folding Currently there is no clear way to know if an operation is constant (i.e. when all rendered pixels have same values). Operations may need to get constant input values before rendering to determine their resolution or areas of interest. This is the case of scale, rotate and translate operations. Only "set operations" are known as constant but many more are constant when all their inputs are so. Such cases can be optimized by only rendering one pixel. Current solution for tiled implementation is to get first pixel from input. This works for root execution groups, others need previous groups to be rendered. On full frame implementation this is not possible, because buffers are created on rendering to reduce peak memory and there is no per pixel calls. This patch evaluates all operations that are constant into primitive operations (Value/Vector/Color) before determining resolutions. Reviewed By: jbakker Differential Revision: https://developer.blender.org/D11490 --- .../blender/compositor/intern/COM_ConstantFolder.h | 64 ++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 source/blender/compositor/intern/COM_ConstantFolder.h (limited to 'source/blender/compositor/intern/COM_ConstantFolder.h') diff --git a/source/blender/compositor/intern/COM_ConstantFolder.h b/source/blender/compositor/intern/COM_ConstantFolder.h new file mode 100644 index 00000000000..2432e859a5a --- /dev/null +++ b/source/blender/compositor/intern/COM_ConstantFolder.h @@ -0,0 +1,64 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Copyright 2021, Blender Foundation. + */ + +#pragma once + +#include "BLI_map.hh" +#include "BLI_set.hh" +#include "BLI_vector.hh" + +#include "COM_NodeOperationBuilder.h" +#include "COM_defines.h" + +namespace blender::compositor { + +class NodeOperation; +class ConstantOperation; +class MemoryBuffer; + +/** + * Evaluates all operations with constant elements into primitive constant operations + * (Value/Vector/Color). + */ +class ConstantFolder { + private: + NodeOperationBuilder &operations_builder_; + + /** Constant operations buffers. */ + Map constant_buffers_; + + rcti max_area_; + rcti first_elem_area_; + + public: + ConstantFolder(NodeOperationBuilder &operations_builder); + int fold_operations(); + + private: + Vector try_fold_operations(Span operations); + ConstantOperation *fold_operation(NodeOperation *operation); + + MemoryBuffer *create_constant_buffer(DataType data_type); + Vector get_constant_input_buffers(NodeOperation *operation); + void delete_constant_buffers(); + + void get_operation_output_operations(NodeOperation *operation, + Vector &r_outputs); +}; + +} // namespace blender::compositor -- cgit v1.2.3