mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-09 22:00:06 +00:00
bd3113e7e3
Read all comments and made corrections to files that aren't part of OpenSubdiv itself but are packaged with it. Commandline output of glPtexViewer is affected. Otherwise no functional changes.
1041 lines
35 KiB
C++
1041 lines
35 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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#include "ptexMipmapTextureLoader.h"
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#include <vector>
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#include <list>
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#include <algorithm>
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#include <cstdio>
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#include <cstring>
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#include <cassert>
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// sample neighbor pixels and populate around blocks
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void
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PtexMipmapTextureLoader::Block::guttering(PtexMipmapTextureLoader *loader,
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PtexTexture *ptex, int level,
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int wid, int hei,
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unsigned char *pptr, int bpp,
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int stride)
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{
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int lineBufferSize = std::max(wid, hei) * bpp;
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unsigned char * lineBuffer = new unsigned char[lineBufferSize];
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for (int edge = 0; edge < 4; edge++) {
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int len = (edge == 0 || edge == 2) ? wid : hei;
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loader->sampleNeighbor(lineBuffer, this->index, edge, len, bpp);
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unsigned char *s = lineBuffer, *d;
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for (int j = 0; j < len; ++j) {
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d = pptr;
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switch (edge) {
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case Ptex::e_bottom:
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d += bpp * (j + 1);
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break;
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case Ptex::e_right:
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d += stride * (j + 1) + bpp * (wid+1);
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break;
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case Ptex::e_top:
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d += stride * (hei+1) + bpp*(len-j);
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break;
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case Ptex::e_left:
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d += stride * (len-j);
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break;
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}
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for (int k = 0; k < bpp; k++)
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*d++ = *s++;
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}
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}
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delete[] lineBuffer;
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// fix corner pixels
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int numchannels = ptex->numChannels();
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float *accumPixel = new float[numchannels];
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int uv[4][2] = {{0, 0}, {1, 0}, {1, 1}, {0, 1}};
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for (int edge = 0; edge < 4; edge++) {
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int du = uv[edge][0];
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int dv = uv[edge][1];
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/* There are 3 cases when filling a corner pixel on gutter.
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case 1: Regular 4 valence
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We already have correct 'B' and 'C' pixels by edge
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resampling above.
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so here only one more pixel 'D' is needed,
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and it will be placed on the gutter corner.
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+-----+-----+
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| | |<-current
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| B|A |
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+-----*-----+
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| D|C |
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| | |
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+-----+-----+
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case 2: T-vertex case (note that this doesn't mean 3 valence)
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If the current face comes from non-quad root face, there
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could be a T-vertex on its corner. Just like case 1,
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need to fill border corner with pixel 'D'.
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+-----+-----+
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| | |<-current
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| B|A |
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| *-----+
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| D|C |
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| | |
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+-----+-----+
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case 3: Other than 4 valence case
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(everything else, including boundary)
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Since guttering pixels are placed on the border of each
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ptex faces, it's not possible to store more than 4 pixels
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at a corner for a reasonable interpolation.
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In this case, we need to average all corner pixels and
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overwrite with an averaged value, so that every face
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vertex picks the same value.
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+---+---+
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| | |<-current
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| B|A |
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+---*---|
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| D/E\C |
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| / \ |
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|/ \|
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+-------+
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*/
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// seamless mipmap only works with square faces.
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if (loader->getCornerPixel(accumPixel, numchannels,
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this->index, edge, (int8_t)(this->ulog2-level))) {
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// case1, case 2
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if (edge == 1 || edge == 2) du += wid;
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if (edge == 2 || edge == 3) dv += hei;
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unsigned char *d = pptr + dv*stride + du*bpp;
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Ptex::ConvertFromFloat(d, accumPixel,
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ptex->dataType(), numchannels);
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} else {
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// case 3, set accumPixel to the corner 4 pixels
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if (edge == 1 || edge == 2) du += wid - 1;
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if (edge == 2 || edge == 3) dv += hei - 1;
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for (int x = 0; x < 2; ++x) {
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for (int y = 0; y < 2; ++y) {
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unsigned char *d = pptr + (dv+x)*stride + (du+y)*bpp;
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Ptex::ConvertFromFloat(d, accumPixel,
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ptex->dataType(), numchannels);
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}
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}
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}
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}
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delete[] accumPixel;
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}
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void
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PtexMipmapTextureLoader::Block::Generate(PtexMipmapTextureLoader *loader,
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PtexTexture *ptex,
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unsigned char *destination,
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int bpp, int wid, int maxLevels)
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{
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const Ptex::FaceInfo &faceInfo = ptex->getFaceInfo(index);
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int stride = bpp * wid;
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int ulog2_ = this->ulog2;
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int vlog2_ = this->vlog2;
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int level = 0;
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int uofs = u, vofs = v;
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// The minimum size of non-subface is 4x4, so that it matches with adjacent
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// 2x2 subfaces.
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int limit = faceInfo.isSubface() ? 1 : 2;
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// but if the base size is already less than limit, we'd like to pick it
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// instead of nothing.
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limit = std::min(std::min(limit, ulog2_), vlog2_);
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while (ulog2_ >= limit && vlog2_ >= limit
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&& (maxLevels == -1 || level <= maxLevels)) {
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if (level % 2 == 1)
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uofs += (1<<(ulog2_+1))+2;
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if ((level > 0) && (level % 2 == 0))
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vofs += (1<<(vlog2_+1)) + 2;
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unsigned char *dst = destination + vofs * stride + uofs * bpp;
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unsigned char *dstData = destination
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+ (vofs + 1) * stride
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+ (uofs + 1) * bpp;
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ptex->getData(index, dstData, stride, Ptex::Res(ulog2_, vlog2_));
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guttering(loader, ptex, level, 1<<ulog2_, 1<<vlog2_, dst, bpp, stride);
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--ulog2_;
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--vlog2_;
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++level;
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}
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nMipmaps = level;
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}
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void
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PtexMipmapTextureLoader::Block::SetSize(unsigned char ulog2_,
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unsigned char vlog2_, bool mipmap)
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{
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ulog2 = ulog2_;
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vlog2 = vlog2_;
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int w = 1 << ulog2;
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int h = 1 << vlog2;
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// includes mipmap
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if (mipmap) {
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w = w + w/2 + 4;
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h = h + 2;
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}
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width = (int16_t)w;
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height = (int16_t)h;
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}
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// ---------------------------------------------------------------------------
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struct PtexMipmapTextureLoader::Page
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{
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struct Slot
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{
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Slot(uint16_t u_, uint16_t v_,
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uint16_t w_, uint16_t h_) :
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u(u_), v(v_), width(w_), height(h_) { }
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uint16_t u, v, width, height;
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// returns true if a block can fit in this slot
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bool Fits(const Block *block) {
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return (block->width <= width) && (block->height <= height);
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}
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};
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typedef std::list<Block *> BlockList;
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Page(uint16_t width, uint16_t height) {
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_slots.push_back(Slot(0, 0, width, height));
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}
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bool IsFull() const {
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return _slots.empty();
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}
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// true when the block "b" is successfully added to this page :
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//
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// |--------------------------| |------------|-------------|
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// | | |............| |
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// | | |............| |
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// | | |.... B .....| Right Slot |
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// | | |............| |
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// | | |............| |
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// | | |------------|-------------|
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// | Original Slot | ==> | |
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// | | | |
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// | | | Bottom Slot |
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// | | | |
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// | | | |
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// |--------------------------| |--------------------------|
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//
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bool AddBlock(Block *block) {
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for (SlotList::iterator it = _slots.begin(); it != _slots.end(); ++it) {
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if (it->Fits(block)) {
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_blocks.push_back(block);
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block->u = it->u;
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block->v = it->v;
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// add new slot to the right
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if (it->width > block->width) {
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_slots.push_front(Slot(it->u + block->width,
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it->v,
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it->width - block->width,
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block->height));
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}
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// add new slot to the bottom
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if (it->height > block->height) {
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_slots.push_back(Slot(it->u,
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it->v + block->height,
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it->width,
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it->height - block->height));
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}
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_slots.erase(it);
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return true;
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}
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}
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return false;
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}
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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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for (BlockList::iterator it = _blocks.begin();
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it != _blocks.end(); ++it) {
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(*it)->Generate(loader, ptex, destination, bpp, width, maxLevels);
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}
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}
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const BlockList &GetBlocks() const {
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return _blocks;
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}
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void Dump() const {
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for (BlockList::const_iterator it = _blocks.begin();
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it != _blocks.end(); ++it) {
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printf(" (%d, %d) %d x %d\n",
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(*it)->u, (*it)->v, (*it)->width, (*it)->height);
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}
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}
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private:
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BlockList _blocks;
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typedef std::list<Slot> SlotList;
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SlotList _slots;
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};
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// ---------------------------------------------------------------------------
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// Utility class for Ptex corner iteration
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class PtexMipmapTextureLoader::CornerIterator
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{
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public:
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CornerIterator(PtexTexture *ptex, int face, int edge, int8_t reslog2) :
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_ptex(ptex),
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_startFace(face), _startEdge(edge),
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_currentFace(face), _currentEdge(edge), _reslog2(reslog2),
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_clockWise(true), _mid(false), _done(false), _isBoundary(true) {
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_numChannels = _ptex->numChannels();
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_currentInfo = _ptex->getFaceInfo(_currentFace);
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if (_currentInfo.isSubface()) ++_reslog2;
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}
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int GetCurrentFace() const {
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return _currentFace;
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}
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void GetPixel(float *resultPixel) {
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int8_t r = (int8_t)(_currentInfo.isSubface() ? _reslog2 - 1 : _reslog2);
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// limit to the maximum ptex resolution
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r = std::min(std::min(r, _currentInfo.res.ulog2),
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_currentInfo.res.vlog2);
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Ptex::Res res(r, r);
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int uv[4][2] = {{0, 0}, {1, 0}, {1, 1}, {0, 1}};
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int u = uv[_currentEdge][0] * (res.u()-1);
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int v = uv[_currentEdge][1] * (res.v()-1);
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_ptex->getPixel(_currentFace, u, v, resultPixel, 0, _numChannels, res);
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}
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bool IsDone() const {
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return _done;
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}
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bool IsSubface() const {
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return _currentInfo.isSubface();
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}
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bool IsBoundary() const {
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return _isBoundary;
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}
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void Next() {
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if (_done) return;
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// next face
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Ptex::FaceInfo info = _ptex->getFaceInfo(_currentFace);
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if (_clockWise) {
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_currentFace = info.adjface(_currentEdge);
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if (_mid) {
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_currentFace = _ptex->getFaceInfo(_currentFace).adjface(2);
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_currentEdge = 1;
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_mid = false;
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} else if (info.isSubface() &&
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(! _ptex->getFaceInfo(_currentFace).isSubface()) &&
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_currentEdge == 3) {
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_mid = true;
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_currentEdge = info.adjedge(_currentEdge);
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} else {
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_mid = false;
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_currentEdge = info.adjedge(_currentEdge);
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_currentEdge = (_currentEdge+1)%4;
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}
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} else {
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_currentFace = info.adjface((_currentEdge+3)%4);
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_currentEdge = info.adjedge((_currentEdge+3)%4);
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}
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if (_currentFace == -1) {
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// border case.
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if (_clockWise) {
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// reset position and restart counter clock wise
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Ptex::FaceInfo sinfo = _ptex->getFaceInfo(_startFace);
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_currentFace = sinfo.adjface((_startEdge+3)%4);
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_currentEdge = sinfo.adjedge((_startEdge+3)%4);
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_clockWise = false;
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} else {
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// end
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_done = true;
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return;
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}
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}
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Ptex::FaceInfo nextFaceInfo = _ptex->getFaceInfo(_currentFace);
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if ((! _clockWise) &&
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(! info.isSubface()) && (nextFaceInfo.isSubface())) {
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// needs tricky traverse for boundary subface...
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if (_currentEdge == 3) {
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_currentFace = nextFaceInfo.adjface(2);
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_currentEdge = 0;
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}
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}
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if (_currentFace == -1) {
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_done = true;
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return;
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}
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if (_currentFace == _startFace) {
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_done = true;
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_isBoundary = false;
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return;
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}
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_currentInfo = _ptex->getFaceInfo(_currentFace);
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}
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private:
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PtexTexture *_ptex;
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int _numChannels;
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int _startFace, _startEdge;
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int _currentFace, _currentEdge;
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int8_t _reslog2;
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bool _clockWise;
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bool _mid;
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bool _done;
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bool _isBoundary;
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Ptex::FaceInfo _currentInfo;
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};
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// ---------------------------------------------------------------------------
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PtexMipmapTextureLoader::PtexMipmapTextureLoader(PtexTexture *ptex,
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int maxNumPages,
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int maxLevels,
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size_t targetMemory,
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bool seamlessMipmap,
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bool padAlpha) :
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_ptex(ptex), _maxLevels(maxLevels), _bpp(0),
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_pageWidth(0), _pageHeight(0),
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_texelBuffer(NULL), _layoutBuffer(NULL), _memoryUsage(0)
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{
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// bytes per pixel
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_bpp = ptex->numChannels() * Ptex::DataSize(ptex->dataType());
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int numFaces = ptex->numFaces();
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_blocks.resize(numFaces);
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for (int i = 0; i < numFaces; ++i) {
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const Ptex::FaceInfo &faceInfo = ptex->getFaceInfo(i);
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_blocks[i].index = i;
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if (seamlessMipmap) {
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// need to squarize ptex face
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unsigned char s = std::min(faceInfo.res.ulog2, faceInfo.res.vlog2);
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_blocks[i].SetSize(s, s, _maxLevels != 0);
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} else {
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_blocks[i].SetSize(faceInfo.res.ulog2,
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faceInfo.res.vlog2,
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_maxLevels != 0);
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}
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}
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optimizePacking(maxNumPages, targetMemory);
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generateBuffers();
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if (padAlpha) {
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addAlphaChannel();
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}
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}
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PtexMipmapTextureLoader::~PtexMipmapTextureLoader()
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{
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for (size_t i = 0; i < _pages.size(); ++i) {
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delete _pages[i];
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}
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delete _texelBuffer;
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delete _layoutBuffer;
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}
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// add alpha channel to texelbuffer :
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// assumes the texel buffer has been generated and apply a raw copy
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// into a larger buffer with an alpha channel padded in
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// note : this is not a particularly elegant solution...
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void
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PtexMipmapTextureLoader::addAlphaChannel() {
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assert(_ptex);
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// allocate new larger texel buffer
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int bpc = Ptex::DataSize(_ptex->dataType()),
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srcStride = _ptex->numChannels() * bpc,
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dstStride = srcStride + bpc;
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size_t numTexels = _pageWidth * _pageHeight * _pages.size(),
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memoryUsed = dstStride * numTexels;
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unsigned char * texBuffer = new unsigned char[memoryUsed];
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// loop over every texel & copy + pad
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unsigned char const * src = _texelBuffer;
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unsigned char * dest = texBuffer;
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for (int i=0; i<(int)numTexels; ++i, src+=srcStride, dest+=dstStride) {
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memcpy(dest, src, srcStride);
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/// set alpha to 1
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switch (_ptex->dataType()) {
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case Ptex::dt_uint8 : *(uint8_t *)(dest+srcStride)= 0xFF; break;
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case Ptex::dt_uint16 : *(uint16_t *)(dest+srcStride) = 0xFFFF; break;
|
|
case Ptex::dt_half : *(uint16_t *)(dest+srcStride) = 0x3C00; break;
|
|
case Ptex::dt_float : *(float *)(dest+srcStride) = 1.0f; break;
|
|
}
|
|
}
|
|
|
|
// remove old buffer & adjust class members
|
|
delete [] _texelBuffer;
|
|
_texelBuffer = texBuffer;
|
|
_memoryUsage = memoryUsed;
|
|
_bpp = dstStride;
|
|
}
|
|
|
|
// resample border texels for guttering
|
|
//
|
|
int
|
|
PtexMipmapTextureLoader::resampleBorder(int face, int edgeId,
|
|
unsigned char *result,
|
|
int dstLength, int bpp,
|
|
float srcStart, float srcEnd)
|
|
{
|
|
Ptex::Res res(_blocks[face].ulog2, _blocks[face].vlog2);
|
|
|
|
int edgeLength = (edgeId == 0 || edgeId == 2) ? res.u() : res.v();
|
|
int srcOffset = (int)(srcStart*edgeLength);
|
|
int srcLength = (int)((srcEnd-srcStart)*edgeLength);
|
|
|
|
if (dstLength >= srcLength) {
|
|
// copy or up sampling (nearest)
|
|
PtexFaceData * data = _ptex->getData(face, res);
|
|
unsigned char *border = new unsigned char[bpp*srcLength];
|
|
|
|
// order of the result will be flipped to match adjacent pixel order
|
|
for (int i = 0; i < srcLength; ++i) {
|
|
int u = 0, v = 0;
|
|
if (edgeId == Ptex::e_bottom) {
|
|
u = edgeLength-1-(i+srcOffset);
|
|
v = 0;
|
|
} else if (edgeId == Ptex::e_right) {
|
|
u = res.u()-1;
|
|
v = edgeLength-1-(i+srcOffset);
|
|
} else if (edgeId == Ptex::e_top) {
|
|
u = i+srcOffset;
|
|
v = res.v()-1;
|
|
} else if (edgeId == Ptex::e_left) {
|
|
u = 0;
|
|
v = i+srcOffset;
|
|
}
|
|
data->getPixel(u, v, &border[i*bpp]);
|
|
}
|
|
|
|
// nearest resample to fit dstLength
|
|
for (int i = 0; i < dstLength; ++i) {
|
|
for (int j = 0; j < bpp; j++) {
|
|
result[i*bpp+j] = border[(i*srcLength/dstLength)*bpp+j];
|
|
}
|
|
}
|
|
data->release();
|
|
delete[] border;
|
|
} else {
|
|
// down sampling
|
|
while (srcLength > dstLength && res.ulog2 && res.vlog2) {
|
|
--res.ulog2;
|
|
--res.vlog2;
|
|
srcLength /= 2;
|
|
}
|
|
|
|
PtexFaceData * data = _ptex->getData(face, res);
|
|
unsigned char *border = new unsigned char[bpp*srcLength];
|
|
edgeLength = (edgeId == 0 || edgeId == 2) ? res.u() : res.v();
|
|
srcOffset = (int)(srcStart*edgeLength);
|
|
|
|
for (int i = 0; i < dstLength; ++i) {
|
|
int u = 0, v = 0;
|
|
if (edgeId == Ptex::e_bottom) {
|
|
u = edgeLength-1-(i+srcOffset);
|
|
v = 0;
|
|
} else if (edgeId == Ptex::e_right) {
|
|
u = res.u() - 1;
|
|
v = edgeLength-1-(i+srcOffset);
|
|
} else if (edgeId == Ptex::e_top) {
|
|
u = i+srcOffset;
|
|
v = res.v() - 1;
|
|
} else if (edgeId == Ptex::e_left) {
|
|
u = 0;
|
|
v = i+srcOffset;
|
|
}
|
|
data->getPixel(u, v, &border[i*bpp]);
|
|
|
|
for (int j = 0; j < bpp; ++j) {
|
|
result[i*bpp+j] = border[i*bpp+j];
|
|
}
|
|
}
|
|
|
|
data->release();
|
|
delete[] border;
|
|
}
|
|
|
|
return srcLength;
|
|
}
|
|
|
|
// flip order of pixel buffer
|
|
static void
|
|
flipBuffer(unsigned char *buffer, int length, int bpp)
|
|
{
|
|
for (int i = 0; i < length/2; ++i) {
|
|
for (int j = 0; j < bpp; j++) {
|
|
std::swap(buffer[i*bpp+j], buffer[(length-1-i)*bpp+j]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// sample neighbor face's edge
|
|
void
|
|
PtexMipmapTextureLoader::sampleNeighbor(unsigned char *border, int face,
|
|
int edge, int length, int bpp)
|
|
{
|
|
const Ptex::FaceInfo &fi = _ptex->getFaceInfo(face);
|
|
|
|
// copy adjacent borders
|
|
int adjface = fi.adjface(edge);
|
|
if (adjface != -1) {
|
|
int ae = fi.adjedge(edge);
|
|
if (!fi.isSubface() && _ptex->getFaceInfo(adjface).isSubface()) {
|
|
/* nonsubface -> subface (1:0.5) see http://ptex.us/adjdata.html for more detail
|
|
+------------------+
|
|
| face |
|
|
+--------edge------+
|
|
| adj face | |
|
|
+----------+-------+
|
|
*/
|
|
resampleBorder(adjface, ae, border, length/2, bpp);
|
|
const Ptex::FaceInfo &sfi1 = _ptex->getFaceInfo(adjface);
|
|
adjface = sfi1.adjface((ae+3)%4);
|
|
ae = (sfi1.adjedge((ae+3)%4)+3)%4;
|
|
resampleBorder(adjface, ae, border+(length/2*bpp),
|
|
length/2, bpp);
|
|
|
|
} else if (fi.isSubface() && !_ptex->getFaceInfo(adjface).isSubface()) {
|
|
/* subface -> nonsubface (0.5:1). two possible configuration
|
|
case 1 case 2
|
|
+----------+----------+ +----------+----------+--------+
|
|
| face | B | | | face | B |
|
|
+---edge---+----------+ +----------+--edge----+--------+
|
|
|0.0 0.5 1.0| |0.0 0.5 1.0|
|
|
| adj face | | adj face |
|
|
+---------------------+ +---------------------+
|
|
*/
|
|
int Bf = fi.adjface((edge+1)%4);
|
|
int Be = fi.adjedge((edge+1)%4);
|
|
int f = _ptex->getFaceInfo(Bf).adjface((Be+1)%4);
|
|
int e = _ptex->getFaceInfo(Bf).adjedge((Be+1)%4);
|
|
if (f == adjface && e == ae) // case 1
|
|
resampleBorder(adjface, ae, border,
|
|
length, bpp, 0.0, 0.5);
|
|
else // case 2
|
|
resampleBorder(adjface, ae, border,
|
|
length, bpp, 0.5, 1.0);
|
|
|
|
} else {
|
|
/* ordinary case (1:1 match)
|
|
+------------------+
|
|
| face |
|
|
+--------edge------+
|
|
| adj face |
|
|
+----------+-------+
|
|
*/
|
|
resampleBorder(adjface, ae, border, length, bpp);
|
|
}
|
|
} else {
|
|
/* border edge. duplicate itself
|
|
+-----------------+
|
|
| face |
|
|
+-------edge------+
|
|
*/
|
|
resampleBorder(face, edge, border, length, bpp);
|
|
flipBuffer(border, length, bpp);
|
|
}
|
|
}
|
|
|
|
// get corner pixel by traversing all adjacent faces around vertex
|
|
//
|
|
bool
|
|
PtexMipmapTextureLoader::getCornerPixel(float *resultPixel, int numchannels,
|
|
int face, int edge,
|
|
int8_t reslog2)
|
|
{
|
|
const Ptex::FaceInfo &fi = _ptex->getFaceInfo(face);
|
|
|
|
/*
|
|
see http://ptex.us/adjdata.html Figure 2 for the reason of conditions edge==1 and 3
|
|
*/
|
|
|
|
if (fi.isSubface() && edge == 3) {
|
|
/*
|
|
in T-vertex case, this function sets 'D' pixel value to *resultPixel and returns false
|
|
gutter line
|
|
|
|
|
+------+-------+
|
|
| | |
|
|
| D|C |<-- gutter line
|
|
| *-------+
|
|
| B|A [2] |
|
|
| |[3] [1]|
|
|
| | [0] |
|
|
+------+-------+
|
|
*/
|
|
int adjface = fi.adjface(edge);
|
|
if (adjface != -1 && !_ptex->getFaceInfo(adjface).isSubface()) {
|
|
int adjedge = fi.adjedge(edge);
|
|
|
|
Ptex::Res res(std::min((int)_blocks[adjface].ulog2, reslog2+1),
|
|
std::min((int)_blocks[adjface].vlog2, reslog2+1));
|
|
|
|
int uv[2] = {0, 0};
|
|
if (adjedge == 0) {
|
|
uv[0] = res.u()/2;
|
|
uv[1] = 0;
|
|
} else if (adjedge == 1) {
|
|
uv[0] = res.u()-1;
|
|
uv[1] = res.v()/2;
|
|
} else if (adjedge == 2) {
|
|
uv[0] = res.u()/2-1;
|
|
uv[1] = res.v()-1;
|
|
} else {
|
|
uv[0] = 0;
|
|
uv[1] = res.v()/2-1;
|
|
}
|
|
|
|
_ptex->getPixel(adjface, uv[0], uv[1],
|
|
resultPixel, 0, numchannels, res);
|
|
return true;
|
|
}
|
|
}
|
|
if (fi.isSubface() && edge == 1) {
|
|
/* gutter line
|
|
|
|
|
+------+-------+
|
|
| | [3] |
|
|
| |[0] [2]|
|
|
| B|A [1] |
|
|
| *-------+
|
|
| D|C |<-- gutter line
|
|
| | |
|
|
+------+-------+
|
|
|
|
note: here we're focusing on vertex A which corresponds to the edge 1,
|
|
but the edge 0 is an adjacent edge to get D pixel.
|
|
*/
|
|
int adjface = fi.adjface(0);
|
|
if (adjface != -1 && !_ptex->getFaceInfo(adjface).isSubface()) {
|
|
int adjedge = fi.adjedge(0);
|
|
Ptex::Res res(std::min((int)_blocks[adjface].ulog2, reslog2+1),
|
|
std::min((int)_blocks[adjface].vlog2, reslog2+1));
|
|
|
|
int uv[2] = {0, 0};
|
|
if (adjedge == 0) {
|
|
uv[0] = res.u()/2-1;
|
|
uv[1] = 0;
|
|
} else if (adjedge == 1) {
|
|
uv[0] = res.u()-1;
|
|
uv[1] = res.v()/2-1;
|
|
} else if (adjedge == 2) {
|
|
uv[0] = res.u()/2;
|
|
uv[1] = res.v()-1;
|
|
} else {
|
|
uv[0] = 0;
|
|
uv[1] = res.v()/2;
|
|
}
|
|
|
|
_ptex->getPixel(adjface, uv[0], uv[1],
|
|
resultPixel, 0, numchannels, res);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
float *pixel = (float*)alloca(sizeof(float)*numchannels);
|
|
float *accumPixel = (float*)alloca(sizeof(float)*numchannels);
|
|
// clear accum pixel
|
|
memset(accumPixel, 0, sizeof(float)*numchannels);
|
|
|
|
// iterate faces around the vertex
|
|
int numFaces = 0;
|
|
CornerIterator it(_ptex, face, edge, reslog2);
|
|
for (; !it.IsDone(); it.Next(), ++numFaces) {
|
|
it.GetPixel(pixel);
|
|
|
|
// accumulate pixel value
|
|
for (int j = 0; j < numchannels; ++j) {
|
|
accumPixel[j] += pixel[j];
|
|
if (numFaces == 2) {
|
|
// also save the diagonal pixel for regular corner case
|
|
resultPixel[j] = pixel[j];
|
|
}
|
|
}
|
|
}
|
|
// if regular corner, returns diagonal pixel without averaging
|
|
if (numFaces == 4 && (! it.IsBoundary())) {
|
|
return true;
|
|
}
|
|
|
|
// non-4 valence. let's average and return false;
|
|
for (int j = 0; j < numchannels; ++j) {
|
|
resultPixel[j] = accumPixel[j]/numFaces;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
int
|
|
PtexMipmapTextureLoader::getLevelDiff(int face, int edge)
|
|
{
|
|
// returns the highest mipmap level difference around the vertex
|
|
// at face/edge
|
|
Ptex::FaceInfo faceInfo = _ptex->getFaceInfo(face);
|
|
|
|
// note: seamless interpolation only works for square tex faces.
|
|
int8_t baseRes = _blocks[face].ulog2;
|
|
if (faceInfo.isSubface()) ++baseRes;
|
|
|
|
int maxDiff = 0;
|
|
CornerIterator it(_ptex, face, edge, baseRes);
|
|
for (; !it.IsDone(); it.Next()) {
|
|
int res = _blocks[it.GetCurrentFace()].ulog2;
|
|
if (it.IsSubface()) ++res;
|
|
maxDiff = std::max(maxDiff, baseRes - res);
|
|
}
|
|
return maxDiff;
|
|
}
|
|
|
|
void
|
|
PtexMipmapTextureLoader::optimizePacking(int maxNumPages,
|
|
size_t targetMemory)
|
|
{
|
|
size_t numTexels = 0;
|
|
|
|
// prepare a list of pointers
|
|
typedef std::vector<Block> BlockArray;
|
|
typedef std::list<Block *> BlockPtrList;
|
|
BlockPtrList blocks;
|
|
for (BlockArray::iterator it = _blocks.begin(); it != _blocks.end(); ++it) {
|
|
blocks.push_back(&(*it));
|
|
numTexels += it->GetNumTexels();
|
|
}
|
|
|
|
// sort blocks by height-width order
|
|
blocks.sort(Block::sort);
|
|
|
|
// try to fit into the target memory size if specified
|
|
if (targetMemory != 0 && _bpp * numTexels > targetMemory) {
|
|
size_t numTargetTexels = targetMemory / _bpp;
|
|
while (numTexels > numTargetTexels) {
|
|
Block *block = blocks.front();
|
|
|
|
if (block->ulog2 < 2 || block->vlog2 < 2) break;
|
|
|
|
// pick a smaller mipmap
|
|
numTexels -= block->GetNumTexels();
|
|
block->SetSize((unsigned char)(block->ulog2-1),
|
|
(unsigned char)(block->vlog2-1), _maxLevels != 0);
|
|
numTexels += block->GetNumTexels();
|
|
|
|
// move to the last
|
|
blocks.pop_front();
|
|
blocks.push_back(block);
|
|
}
|
|
}
|
|
|
|
// compute page size ---------------------------------------------
|
|
{
|
|
// page size is set to the largest edge of the largest block :
|
|
// this is the smallest possible page size, which should minimize
|
|
// the texels wasted on the "last page" when the smallest blocks are
|
|
// being packed.
|
|
int w = 0, h = 0;
|
|
for (BlockPtrList::iterator it = blocks.begin();
|
|
it != blocks.end(); ++it) {
|
|
w = std::max(w, (int)(*it)->width);
|
|
h = std::max(h, (int)(*it)->height);
|
|
}
|
|
|
|
// grow the page size to make sure the optimization will not exceed
|
|
// the maximum number of pages allowed
|
|
int minPageSize = 512;
|
|
int maxPageSize = 4096; // XXX:should be configurable.
|
|
|
|
// use minPageSize if too small
|
|
if (w < minPageSize) w = w*(minPageSize/w + 1);
|
|
if (h < minPageSize) h = h*(minPageSize/h + 1);
|
|
|
|
// rough estimate of num pages
|
|
int estimatedNumPages = (int)numTexels/w/h;
|
|
|
|
// if expecting too many pages, increase page size
|
|
int pageLimit = std::max(1, maxNumPages/2);
|
|
if (estimatedNumPages > pageLimit) {
|
|
w = std::min(w*(estimatedNumPages/pageLimit), maxPageSize);
|
|
estimatedNumPages = (int)numTexels/w/h;
|
|
}
|
|
if (estimatedNumPages > pageLimit) {
|
|
h = std::min(h*(estimatedNumPages/pageLimit), maxPageSize);
|
|
}
|
|
|
|
_pageWidth = w;
|
|
_pageHeight = h;
|
|
}
|
|
|
|
// pack blocks into slots ----------------------------------------
|
|
size_t firstslot = 0;
|
|
for (BlockPtrList::iterator it = blocks.begin();
|
|
it != blocks.end(); ++it) {
|
|
Block *block = *it;
|
|
|
|
// traverse existing pages for a suitable slot ---------------
|
|
bool added = false;
|
|
for (size_t p = firstslot; p < _pages.size(); ++p) {
|
|
if ((added = _pages[p]->AddBlock(block)) == true) {
|
|
break;
|
|
}
|
|
}
|
|
// if none of page was found : start new page
|
|
if (!added) {
|
|
Page *page = new Page(_pageWidth, _pageHeight);
|
|
added = page->AddBlock(block);
|
|
assert(added);
|
|
_pages.push_back(page);
|
|
}
|
|
|
|
// adjust the page flag to the first page with open slots
|
|
if (_pages.size() > (firstslot+1) &&
|
|
_pages[firstslot+1]->IsFull()) ++firstslot;
|
|
}
|
|
|
|
// set corner pixel mipmap factors
|
|
for (BlockArray::iterator it = _blocks.begin(); it != _blocks.end(); ++it) {
|
|
int face = it->index;
|
|
uint16_t adjSizeDiffs = 0;
|
|
for (int edge = 0; edge < 4; ++edge) {
|
|
int levelDiff = getLevelDiff(face, edge);
|
|
adjSizeDiffs <<= 4;
|
|
adjSizeDiffs |= (uint16_t)levelDiff;
|
|
}
|
|
it->adjSizeDiffs = adjSizeDiffs;
|
|
// printf("Block %d, %08x\n", it->index, adjSizeDiffs);
|
|
}
|
|
|
|
#if 0
|
|
for (size_t i = 0; i < _pages.size(); ++i) {
|
|
printf("Page %ld : \n", i);
|
|
_pages[i]->Dump();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void
|
|
PtexMipmapTextureLoader::generateBuffers()
|
|
{
|
|
// ptex layout struct
|
|
// struct Layout {
|
|
// uint16_t page;
|
|
// uint16_t nMipmap;
|
|
// uint16_t u;
|
|
// uint16_t v;
|
|
// uint16_t adjSizeDiffs; //(4:4:4:4)
|
|
// uint8_t width log2;
|
|
// uint8_t height log2;
|
|
// };
|
|
|
|
int numFaces = (int)_blocks.size();
|
|
int numPages = (int)_pages.size();
|
|
|
|
// populate the texels
|
|
int pageStride = _bpp * _pageWidth * _pageHeight;
|
|
|
|
_texelBuffer = new unsigned char[pageStride * numPages];
|
|
_memoryUsage = pageStride * numPages;
|
|
memset(_texelBuffer, 0, pageStride * numPages);
|
|
|
|
for (int i = 0; i < numPages; ++i) {
|
|
_pages[i]->Generate(this, _ptex, _texelBuffer + pageStride * i,
|
|
_bpp, _pageWidth, _maxLevels);
|
|
}
|
|
|
|
// populate the layout texture buffer
|
|
_layoutBuffer = new unsigned char[numFaces * sizeof(uint16_t) * 6];
|
|
_memoryUsage += numFaces * sizeof(uint16_t) * 6;
|
|
for (int i = 0; i < numPages; ++i) {
|
|
Page *page = _pages[i];
|
|
for (Page::BlockList::const_iterator it = page->GetBlocks().begin();
|
|
it != page->GetBlocks().end(); ++it) {
|
|
int ptexIndex = (*it)->index;
|
|
uint16_t *p = (uint16_t*)(_layoutBuffer
|
|
+ sizeof(uint16_t)*6*ptexIndex);
|
|
*p++ = (uint16_t)i; // page
|
|
*p++ = (uint16_t)((*it)->nMipmaps-1);
|
|
*p++ = (uint16_t)((*it)->u+1);
|
|
*p++ = (uint16_t)((*it)->v+1);
|
|
*p++ = (*it)->adjSizeDiffs;
|
|
*p++ = (uint16_t)(((*it)->ulog2 << 8) | (*it)->vlog2);
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
// debug
|
|
FILE *fp = fopen("out.ppm", "w");
|
|
fprintf(fp, "P3\n");
|
|
fprintf(fp, "%d %d\n", _pageWidth, _pageHeight * numPages);
|
|
fprintf(fp, "255\n");
|
|
unsigned char *p = _texelBuffer;
|
|
for (int i = 0; i < numPages; ++i) {
|
|
for (int y = 0; y < _pageHeight; ++y) {
|
|
for (int x = 0; x < _pageWidth; ++x) {
|
|
fprintf(fp, "%d %d %d ", (int)p[0], (int)p[1], (int)p[2]);
|
|
p += _bpp;
|
|
}
|
|
fprintf(fp, "\n");
|
|
}
|
|
}
|
|
fclose(fp);
|
|
#endif
|
|
}
|