7d8a186335
Based on @fclem's suggestion in D6421, this commit implements support for storing all tiles of a UDIM texture in a single 2D array texture on the GPU. Previously, Eevee was binding one OpenGL texture per tile, quickly running into hardware limits with nontrivial UDIM texture sets. Workbench meanwhile had no UDIM support at all, as reusing the per-tile approach would require splitting the mesh by tile as well as texture. With this commit, both Workbench as well as Eevee now support huge numbers of tiles, with the eventual limits being GPU memory and ultimately GL_MAX_ARRAY_TEXTURE_LAYERS, which tends to be in the 1000s on modern GPUs. Initially my plan was to have one array texture per unique size, but managing the different textures and keeping everything consistent ended up being way too complex. Therefore, we now use a simpler version that allocates a texture that is large enough to fit the largest tile and then packs all tiles into as many layers as necessary. As a result, each UDIM texture only binds two textures (one for the actual images, one for metadata) regardless of how many tiles are used. Note that this rolls back per-tile GPUTextures, meaning that we again have per-Image GPUTextures like we did before the original UDIM commit, but now with four instead of two types. Reviewed By: fclem Differential Revision: https://developer.blender.org/D6456
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*/
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#ifndef __BLI_BOXPACK_2D_H__
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#define __BLI_BOXPACK_2D_H__
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/** \file
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* \ingroup bli
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*/
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struct ListBase;
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/* Box Packer */
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typedef struct BoxPack {
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float x;
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float y;
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float w;
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float h;
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/* Verts this box uses
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* (BL,TR,TL,BR) / 0,1,2,3 */
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struct BoxVert *v[4];
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int index;
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} BoxPack;
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void BLI_box_pack_2d(BoxPack *boxarray,
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const unsigned int len,
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float *tot_width,
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float *tot_height);
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typedef struct FixedSizeBoxPack {
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struct FixedSizeBoxPack *next, *prev;
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int x, y;
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int w, h;
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} FixedSizeBoxPack;
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void BLI_box_pack_2d_fixedarea(struct ListBase *boxes,
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int width,
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int height,
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struct ListBase *packed);
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#endif /* __BLI_BOXPACK_2D_H__ */
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