mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-23 12:10:08 +00:00
137 lines
3.7 KiB
C++
137 lines
3.7 KiB
C++
//
|
|
// Copyright 2013 Pixar
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "Apache License")
|
|
// with the following modification; you may not use this file except in
|
|
// compliance with the Apache License and the following modification to it:
|
|
// Section 6. Trademarks. is deleted and replaced with:
|
|
//
|
|
// 6. Trademarks. This License does not grant permission to use the trade
|
|
// names, trademarks, service marks, or product names of the Licensor
|
|
// and its affiliates, except as required to comply with Section 4(c) of
|
|
// the License and to reproduce the content of the NOTICE file.
|
|
//
|
|
// You may obtain a copy of the Apache License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the Apache License with the above modification is
|
|
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
// KIND, either express or implied. See the Apache License for the specific
|
|
// language governing permissions and limitations under the Apache License.
|
|
//
|
|
|
|
#ifndef OSD_PTEX_MIPMAP_TEXTURE_LOADER_H
|
|
#define OSD_PTEX_MIPMAP_TEXTURE_LOADER_H
|
|
|
|
#include "../version.h"
|
|
|
|
#include <vector>
|
|
|
|
class PtexTexture;
|
|
|
|
namespace OpenSubdiv {
|
|
namespace OPENSUBDIV_VERSION {
|
|
|
|
class OsdPtexMipmapTextureLoader {
|
|
public:
|
|
OsdPtexMipmapTextureLoader(PtexTexture *ptex,
|
|
int maxNumPages, int maxLevels=10);
|
|
~OsdPtexMipmapTextureLoader();
|
|
|
|
const unsigned char * GetLayoutBuffer() const {
|
|
return _layoutBuffer;
|
|
}
|
|
const unsigned char * GetTexelBuffer() const {
|
|
return _texelBuffer;
|
|
}
|
|
int GetNumFaces() const {
|
|
return (int)_blocks.size();
|
|
}
|
|
int GetNumPages() const {
|
|
return (int)_pages.size();
|
|
}
|
|
int GetPageWidth() const {
|
|
return _pageWidth;
|
|
}
|
|
int GetPageHeight() const {
|
|
return _pageHeight;
|
|
}
|
|
|
|
/*
|
|
block : atomic texture unit
|
|
XXX: face of 128x128 or more (64kb~) texels should be considered separately
|
|
using ARB_sparse_texture...?
|
|
|
|
. : per-face texels for each mipmap level
|
|
x : guttering pixel
|
|
|
|
xxxxxxxxxxxxxx
|
|
x........xx..x 2x2
|
|
x........xx..x
|
|
x........xxxxx
|
|
x..8x8...xxxxxxx
|
|
x........xx....x
|
|
x........xx....x 4x4
|
|
x........xx....x
|
|
x........xx....x
|
|
xxxxxxxxxxxxxxxx
|
|
|
|
For each face (w*h), texels with guttering and mipmap is stored into
|
|
(w+2+w/2+2)*(h+2) area as above.
|
|
|
|
*/
|
|
|
|
/*
|
|
Ptex loader
|
|
|
|
Texels buffer : the packed texels
|
|
|
|
*/
|
|
|
|
private:
|
|
struct Block {
|
|
int index; // ptex index
|
|
int nMipmaps;
|
|
unsigned short u, v; // top-left texel offset
|
|
unsigned short width, height; // texel dimension (includes mipmap)
|
|
unsigned char ulog2, vlog2; // texel dimension log2 (original tile)
|
|
|
|
void Generate(PtexTexture *ptex, unsigned char *destination,
|
|
int bpp, int width, int maxLevels);
|
|
|
|
void guttering(PtexTexture *ptex, int level, int width, int height,
|
|
unsigned char *pptr, int bpp, int stride);
|
|
|
|
static bool sort(const Block *a, const Block *b) {
|
|
return (a->height > b->height) or
|
|
((a->height == b->height) and (a->width > b->width));
|
|
}
|
|
};
|
|
|
|
struct Page;
|
|
|
|
void generateBuffers();
|
|
void optimizePacking(int maxNumPages);
|
|
|
|
std::vector<Block> _blocks;
|
|
std::vector<Page *> _pages;
|
|
|
|
PtexTexture *_ptex;
|
|
int _maxLevels;
|
|
int _bpp;
|
|
int _pageWidth, _pageHeight;
|
|
|
|
unsigned char *_texelBuffer;
|
|
unsigned char *_layoutBuffer;
|
|
};
|
|
|
|
|
|
} // end namespace OPENSUBDIV_VERSION
|
|
using namespace OPENSUBDIV_VERSION;
|
|
|
|
} // end namespace OpenSubdiv
|
|
|
|
#endif // OSD_PTEX_MIPMAP_TEXTURE_LOADER_H
|