mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
//
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// Copyright 2013 Pixar
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License
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// and the following modification to it: Section 6 Trademarks.
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// deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the
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// trade names, trademarks, service marks, or product names of the
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// Licensor and its affiliates, except as required for reproducing
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// the content of the NOTICE file.
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//
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific
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// language governing permissions and limitations under the
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// License.
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//
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#ifndef OSD_PTEX_MIPMAP_TEXTURE_LOADER_H
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#define OSD_PTEX_MIPMAP_TEXTURE_LOADER_H
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#include "../version.h"
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#include <vector>
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class PtexTexture;
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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class OsdPtexMipmapTextureLoader {
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public:
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OsdPtexMipmapTextureLoader(PtexTexture *ptex,
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int maxNumPages, int maxLevels=10);
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~OsdPtexMipmapTextureLoader();
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const unsigned char * GetLayoutBuffer() const {
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return _layoutBuffer;
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}
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const unsigned char * GetTexelBuffer() const {
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return _texelBuffer;
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}
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int GetNumFaces() const {
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return (int)_blocks.size();
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}
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int GetNumPages() const {
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return (int)_pages.size();
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}
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int GetPageWidth() const {
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return _pageWidth;
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}
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int GetPageHeight() const {
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return _pageHeight;
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}
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/*
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block : atomic texture unit
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XXX: face of 128x128 or more (64kb~) texels should be considered separately
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using ARB_sparse_texture...?
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. : per-face texels for each mipmap level
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x : guttering pixel
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xxxxxxxxxxxxxx
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x........xx..x 2x2
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x........xx..x
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x........xxxxx
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x..8x8...xxxxxxx
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x........xx....x
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x........xx....x 4x4
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x........xx....x
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x........xx....x
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xxxxxxxxxxxxxxxx
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For each face (w*h), texels with guttering and mipmap is stored into
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(w+2+w/2+2)*(h+2) area as above.
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*/
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/*
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Ptex loader
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Texels buffer : the packed texels
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*/
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private:
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struct Block {
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int index; // ptex index
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int nMipmaps;
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unsigned short u, v; // top-left texel offset
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unsigned short width, height; // texel dimension (includes mipmap)
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unsigned short texWidth, texHeight; // texel dimension (original tile)
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void Generate(PtexTexture *ptex, unsigned char *destination,
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int bpp, int width, int maxLevels);
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void guttering(PtexTexture *ptex, int level, int width, int height,
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unsigned char *pptr, int bpp, int stride);
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static bool sort(const Block *a, const Block *b) {
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return (a->height > b->height) or
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((a->height == b->height) and (a->width > b->width));
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}
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};
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struct Page;
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void generateBuffers();
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void optimizePacking(int maxNumPages);
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std::vector<Block> _blocks;
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std::vector<Page *> _pages;
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PtexTexture *_ptex;
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int _maxLevels;
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int _bpp;
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int _pageWidth, _pageHeight;
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unsigned char *_texelBuffer;
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unsigned char *_layoutBuffer;
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};
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} // end namespace OPENSUBDIV_VERSION
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using namespace OPENSUBDIV_VERSION;
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} // end namespace OpenSubdiv
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#endif // OSD_PTEX_MIPMAP_TEXTURE_LOADER_H
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