mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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157 lines
4.8 KiB
C++
157 lines
4.8 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 "Apache License")
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// with the following modification; you may not use this file except in
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// compliance with the Apache License and the following modification to it:
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// Section 6. Trademarks. is deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the trade
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// names, trademarks, service marks, or product names of the Licensor
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// and its affiliates, except as required to comply with Section 4(c) of
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// the License and to reproduce the content of the NOTICE file.
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//
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// You may obtain a copy of the Apache 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, software
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// distributed under the Apache License with the above modification is
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// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the Apache License for the specific
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// language governing permissions and limitations under the Apache License.
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//
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#ifndef OPENSUBDIV_EXAMPLES_PTEX_MIPMAP_TEXTURE_LOADER_H
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#define OPENSUBDIV_EXAMPLES_PTEX_MIPMAP_TEXTURE_LOADER_H
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#include <Ptexture.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <vector>
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class PtexMipmapTextureLoader {
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public:
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PtexMipmapTextureLoader(PtexTexture *ptex,
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int maxNumPages,
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int maxLevels = -1,
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size_t targetMemory = 0,
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bool seamlessMipmap = true,
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bool padAlpha = false);
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~PtexMipmapTextureLoader();
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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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size_t GetMemoryUsage() const {
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return _memoryUsage;
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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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uint16_t u, v; // top-left texel offset
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uint16_t width, height; // texel dimension (includes mipmap)
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uint16_t adjSizeDiffs; // maximum tile size difference around each vertices
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int8_t ulog2, vlog2; // texel dimension log2 (original tile)
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void Generate(PtexMipmapTextureLoader *loader, PtexTexture *ptex,
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unsigned char *destination,
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int bpp, int width, int maxLevels);
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void SetSize(unsigned char ulog2_, unsigned char vlog2_, bool mipmap);
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int GetNumTexels() const {
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return width*height;
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}
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void guttering(PtexMipmapTextureLoader *loader, PtexTexture *ptex,
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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) ||
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((a->height == b->height) && (a->width > b->width));
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}
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};
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struct Page;
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class CornerIterator;
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void generateBuffers();
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void optimizePacking(int maxNumPages, size_t targetMemory);
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int getLevelDiff(int face, int edge);
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bool getCornerPixel(float *resultPixel, int numchannels,
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int face, int edge, int8_t res);
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void sampleNeighbor(unsigned char *border,
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int face, int edge, int length, int bpp);
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int resampleBorder(int face, int edgeId, unsigned char *result,
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int dstLength, int bpp,
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float srcStart = 0.0f, float srcEnd = 1.0f);
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void addAlphaChannel();
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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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size_t _memoryUsage;
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};
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#endif // OPENSUBDIV_EXAMPLES_PTEX_MIPMAP_TEXTURE_LOADER_H
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