Ptex: PtexTriangleFilter.cpp Source File

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PtexTriangleFilter.cpp
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35
36#include "PtexPlatform.h"
37#include <cmath>
38#include <assert.h>
39
40#include "PtexTriangleFilter.h"
41#include "PtexTriangleKernel.h"
42#include "PtexUtils.h"
43
44namespace {
45 inline float squared(float x) { return x*x; }
46}
47
48 PTEX_NAMESPACE_BEGIN
49
50 void PtexTriangleFilter::eval(float* result, int firstChan, int nChannels,
51 int faceid, float u, float v,
52 float uw1, float vw1, float uw2, float vw2,
53 float width, float blur)
54{
55 // init
56 if (!_tx || nChannels <= 0) return;
57 if (faceid < 0 || faceid >= _tx->numFaces()) return;
58 _ntxchan = _tx->numChannels();
59 _dt = _tx->dataType();
60 _firstChanOffset = firstChan*DataSize(_dt);
61 _nchan = PtexUtils::min(nChannels, _ntxchan-firstChan);
62
63 // get face info
64 const FaceInfo& f = _tx->getFaceInfo(faceid);
65
66 // if neighborhood is constant, just return constant value of face
67 if (f.isNeighborhoodConstant()) {
68 PtexPtr<PtexFaceData> data ( _tx->getData(faceid, 0) );
69 if (data) {
70 char* d = (char*) data->getData() + _firstChanOffset;
71 Ptex::ConvertToFloat(result, d, _dt, _nchan);
72 }
73 return;
74 }
75
76 // clamp u and v
77 u = PtexUtils::clamp(u, 0.0f, 1.0f);
78 v = PtexUtils::clamp(v, 0.0f, 1.0f);
79
80 // build kernel
81 PtexTriangleKernel k;
82 buildKernel(k, u, v, uw1, vw1, uw2, vw2, width, blur, f.res);
83
84 // accumulate the weight as we apply
85 _weight = 0;
86
87 // allocate temporary result
88 _result = (float*) alloca(sizeof(float)*_nchan);
89 memset(_result, 0, sizeof(float)*_nchan);
90
91 // apply to faces
92 splitAndApply(k, faceid, f);
93
94 // normalize (both for data type and cumulative kernel weight applied)
95 // and output result
96 float scale = 1.0f / (_weight * OneValue(_dt));
97 for (int i = 0; i < _nchan; i++) result[i] = float(_result[i] * scale);
98
99 // clear temp result
100 _result = 0;
101}
102
103
104
105 void PtexTriangleFilter::buildKernel(PtexTriangleKernel& k, float u, float v,
106 float uw1, float vw1, float uw2, float vw2,
107 float width, float blur, Res faceRes)
108{
109 const float sqrt3 = 1.7320508075688772f;
110
111 // compute ellipse coefficients, A*u^2 + B*u*v + C*v^2 == AC - B^2/4
112 float scaleAC = 0.25f * width*width;
113 float scaleB = -2.0f * scaleAC;
114 float A = (vw1*vw1 + vw2*vw2) * scaleAC;
115 float B = (uw1*vw1 + uw2*vw2) * scaleB;
116 float C = (uw1*uw1 + uw2*uw2) * scaleAC;
117
118 // convert to cartesian domain
119 float Ac = 0.75f * A;
120 float Bc = float(sqrt3/2) * (B-A);
121 float Cc = 0.25f * A - 0.5f * B + C;
122
123 // compute min blur for eccentricity clamping
124 const float maxEcc = 15.0f; // max eccentricity
125 const float eccRatio = (maxEcc*maxEcc + 1.0f) / (maxEcc*maxEcc - 1.0f);
126 float X = sqrtf(squared(Ac - Cc) + squared(Bc));
127 float b_e = 0.5f * (eccRatio * X - (Ac + Cc));
128
129 // compute min blur for texel clamping
130 // (ensure that ellipse is no smaller than a texel)
131 float b_t = squared(0.5f / (float)faceRes.u());
132
133 // add blur
134 float b_b = 0.25f * blur * blur;
135 float b = PtexUtils::max(b_b, PtexUtils::max(b_e, b_t));
136 Ac += b;
137 Cc += b;
138
139 // compute minor radius
140 float m = sqrtf(2.0f*(Ac*Cc - 0.25f*Bc*Bc) / (Ac + Cc + X));
141
142 // choose desired resolution
143 int reslog2 = PtexUtils::max(0, PtexUtils::calcResFromWidth(2.0f*m));
144
145 // convert back to triangular domain
146 A = float(4/3.0) * Ac;
147 B = float(2/sqrt3) * Bc + A;
148 C = -0.25f * A + 0.5f * B + Cc;
149
150 // scale by kernel width
151 float scale = PtexTriangleKernelWidth * PtexTriangleKernelWidth;
152 A *= scale;
153 B *= scale;
154 C *= scale;
155
156 // find u,v,w extents
157 float uw = PtexUtils::min(sqrtf(C), 1.0f);
158 float vw = PtexUtils::min(sqrtf(A), 1.0f);
159 float ww = PtexUtils::min(sqrtf(A-B+C), 1.0f);
160
161 // init kernel
162 float w = 1.0f - u - v;
163 k.set(Res((int8_t)reslog2, (int8_t)reslog2), u, v, u-uw, v-vw, w-ww, u+uw, v+vw, w+ww, A, B, C);
164}
165
166
167 void PtexTriangleFilter::splitAndApply(PtexTriangleKernel& k, int faceid, const Ptex::FaceInfo& f)
168{
169 // do we need to split? if so, split kernel and apply across edge(s)
170 if (k.u1 < 0 && f.adjface(2) >= 0) {
171 PtexTriangleKernel ka;
172 k.splitU(ka);
173 applyAcrossEdge(ka, f, 2);
174 }
175 if (k.v1 < 0 && f.adjface(0) >= 0) {
176 PtexTriangleKernel ka;
177 k.splitV(ka);
178 applyAcrossEdge(ka, f, 0);
179 }
180 if (k.w1 < 0 && f.adjface(1) >= 0) {
181 PtexTriangleKernel ka;
182 k.splitW(ka);
183 applyAcrossEdge(ka, f, 1);
184 }
185 // apply to local face
186 apply(k, faceid, f);
187}
188
189
190 void PtexTriangleFilter::applyAcrossEdge(PtexTriangleKernel& k,
191 const Ptex::FaceInfo& f, int eid)
192{
193 int afid = f.adjface(eid), aeid = f.adjedge(eid);
194 const Ptex::FaceInfo& af = _tx->getFaceInfo(afid);
195 k.reorient(eid, aeid);
196 splitAndApply(k, afid, af);
197}
198
199
200 void PtexTriangleFilter::apply(PtexTriangleKernel& k, int faceid, const Ptex::FaceInfo& f)
201{
202 // clamp kernel face (resolution and extent)
203 k.clampRes(f.res);
204 k.clampExtent();
205
206 // build kernel iterators
207 PtexTriangleKernelIter keven, kodd;
208 k.getIterators(keven, kodd);
209 if (!keven.valid && !kodd.valid) return;
210
211 // get face data, and apply
212 PtexPtr<PtexFaceData> dh ( _tx->getData(faceid, k.res) );
213 if (!dh) return;
214
215 if (keven.valid) applyIter(keven, dh);
216 if (kodd.valid) applyIter(kodd, dh);
217}
218
219
220 void PtexTriangleFilter::applyIter(PtexTriangleKernelIter& k, PtexFaceData* dh)
221{
222 if (dh->isConstant()) {
223 k.applyConst(_result, (char*)dh->getData()+_firstChanOffset, _dt, _nchan);
224 _weight += k.weight;
225 }
226 else if (dh->isTiled()) {
227 Ptex::Res tileres = dh->tileRes();
228 PtexTriangleKernelIter kt = k;
229 int tileresu = tileres.u();
230 int tileresv = tileres.v();
231 kt.rowlen = tileresu;
232 int ntilesu = k.rowlen / kt.rowlen;
233 int wOffsetBase = k.rowlen - tileresu;
234 for (int tilev = k.v1 / tileresv, tilevEnd = (k.v2-1) / tileresv; tilev <= tilevEnd; tilev++) {
235 int vOffset = tilev * tileresv;
236 kt.v = k.v - (float)vOffset;
237 kt.v1 = PtexUtils::max(0, k.v1 - vOffset);
238 kt.v2 = PtexUtils::min(k.v2 - vOffset, tileresv);
239 for (int tileu = k.u1 / tileresu, tileuEnd = (k.u2-1) / tileresu; tileu <= tileuEnd; tileu++) {
240 int uOffset = tileu * tileresu;
241 int wOffset = wOffsetBase - uOffset - vOffset;
242 kt.u = k.u - (float)uOffset;
243 kt.u1 = PtexUtils::max(0, k.u1 - uOffset);
244 kt.u2 = PtexUtils::min(k.u2 - uOffset, tileresu);
245 kt.w1 = k.w1 - wOffset;
246 kt.w2 = k.w2 - wOffset;
247 PtexPtr<PtexFaceData> th ( dh->getTile(tilev * ntilesu + tileu) );
248 if (th) {
249 kt.weight = 0;
250 if (th->isConstant())
251 kt.applyConst(_result, (char*)th->getData()+_firstChanOffset, _dt, _nchan);
252 else
253 kt.apply(_result, (char*)th->getData()+_firstChanOffset, _dt, _nchan, _ntxchan);
254 _weight += kt.weight;
255 }
256 }
257 }
258 }
259 else {
260 k.apply(_result, (char*)dh->getData()+_firstChanOffset, _dt, _nchan, _ntxchan);
261 _weight += k.weight;
262 }
263}
264
265 PTEX_NAMESPACE_END
PtexPlatform.h
Platform-specific classes, functions, and includes.
PtexTriangleFilter.h
PtexTriangleKernel.h
C
#define C(eid, aeid)
PtexTriangleKernelWidth
PTEX_NAMESPACE_BEGIN const float PtexTriangleKernelWidth
Definition PtexTriangleKernel.h:50
PtexUtils.h
PTEX_NAMESPACE_END
#define PTEX_NAMESPACE_END
Definition PtexVersion.h:62
PtexFaceData
Per-face texture data accessor.
Definition Ptexture.h:406
PtexFaceData::getTile
virtual PtexFaceData * getTile(int tile)=0
Access a tile from the data block.
PtexFaceData::isTiled
virtual bool isTiled()=0
True if this data block is tiled.
PtexFaceData::tileRes
virtual Ptex::Res tileRes()=0
Resolution of each tile in this data block.
PtexFaceData::isConstant
virtual bool isConstant()=0
True if this data block is constant.
PtexFaceData::getData
virtual void * getData()=0
Access the data from this data block.
PtexPtr
Smart-pointer for acquiring and releasing API objects.
Definition Ptexture.h:1032
PtexTexture::getData
virtual void getData(int faceid, void *buffer, int stride)=0
Access texture data for a face at highest-resolution.
PtexTexture::numFaces
virtual int numFaces()=0
Number of faces stored in file.
PtexTexture::dataType
virtual Ptex::DataType dataType()=0
Type of data stored in file.
PtexTexture::numChannels
virtual int numChannels()=0
Number of channels stored in file.
PtexTexture::getFaceInfo
virtual const Ptex::FaceInfo & getFaceInfo(int faceid)=0
Access resolution and adjacency information about a face.
PtexTriangleFilter::_ntxchan
int _ntxchan
Definition PtexTriangleFilter.h:77
PtexTriangleFilter::splitAndApply
void splitAndApply(PtexTriangleKernel &k, int faceid, const Ptex::FaceInfo &f)
Definition PtexTriangleFilter.cpp:167
PtexTriangleFilter::_weight
float _weight
Definition PtexTriangleFilter.h:74
PtexTriangleFilter::applyIter
void applyIter(PtexTriangleKernelIter &k, PtexFaceData *dh)
Definition PtexTriangleFilter.cpp:220
PtexTriangleFilter::apply
void apply(PtexTriangleKernel &k, int faceid, const Ptex::FaceInfo &f)
Definition PtexTriangleFilter.cpp:200
PtexTriangleFilter::_result
float * _result
Definition PtexTriangleFilter.h:73
PtexTriangleFilter::buildKernel
void buildKernel(PtexTriangleKernel &k, float u, float v, float uw1, float vw1, float uw2, float vw2, float width, float blur, Res faceRes)
Definition PtexTriangleFilter.cpp:105
PtexTriangleFilter::_firstChanOffset
int _firstChanOffset
Definition PtexTriangleFilter.h:75
PtexTriangleFilter::applyAcrossEdge
void applyAcrossEdge(PtexTriangleKernel &k, const Ptex::FaceInfo &f, int eid)
Definition PtexTriangleFilter.cpp:190
PtexTriangleFilter::_nchan
int _nchan
Definition PtexTriangleFilter.h:76
PtexTriangleFilter::eval
virtual void eval(float *result, int firstchan, int nchannels, int faceid, float u, float v, float uw1, float vw1, float uw2, float vw2, float width, float blur)
Apply filter to a ptex data file.
Definition PtexTriangleFilter.cpp:50
PtexTriangleFilter::_dt
DataType _dt
Definition PtexTriangleFilter.h:78
PtexTriangleFilter::_tx
PtexTexture * _tx
Definition PtexTriangleFilter.h:71
PtexTriangleKernelIter
Triangle filter kernel iterator (in texel coords)
Definition PtexTriangleKernel.h:54
PtexTriangleKernelIter::v1
int v1
Definition PtexTriangleKernel.h:58
PtexTriangleKernelIter::v2
int v2
Definition PtexTriangleKernel.h:59
PtexTriangleKernelIter::rowlen
int rowlen
Definition PtexTriangleKernel.h:56
PtexTriangleKernelIter::w1
int w1
Definition PtexTriangleKernel.h:58
PtexTriangleKernelIter::u
float u
Definition PtexTriangleKernel.h:57
PtexTriangleKernelIter::apply
void apply(float *dst, void *data, DataType dt, int nChan, int nTxChan)
Definition PtexTriangleKernel.h:65
PtexTriangleKernelIter::w2
int w2
Definition PtexTriangleKernel.h:59
PtexTriangleKernelIter::u1
int u1
Definition PtexTriangleKernel.h:58
PtexTriangleKernelIter::weight
float weight
Definition PtexTriangleKernel.h:63
PtexTriangleKernelIter::valid
bool valid
Definition PtexTriangleKernel.h:61
PtexTriangleKernelIter::u2
int u2
Definition PtexTriangleKernel.h:59
PtexTriangleKernelIter::applyConst
void applyConst(float *dst, void *data, DataType dt, int nChan)
Definition PtexTriangleKernel.cpp:153
PtexTriangleKernelIter::v
float v
Definition PtexTriangleKernel.h:57
PtexTriangleKernel
Triangle filter kernel (in normalized triangle coords)
Definition PtexTriangleKernel.h:82
PtexTriangleKernel::reorient
void reorient(int eid, int aeid)
Definition PtexTriangleKernel.h:151
PtexTriangleKernel::clampExtent
void clampExtent()
Definition PtexTriangleKernel.h:178
PtexTriangleKernel::set
void set(Res resVal, float uVal, float vVal, float u1Val, float v1Val, float w1Val, float u2Val, float v2Val, float w2Val, float AVal, float BVal, float CVal)
Definition PtexTriangleKernel.h:90
PtexTriangleKernel::u1
float u1
Definition PtexTriangleKernel.h:86
PtexTriangleKernel::splitW
void splitW(PtexTriangleKernel &ka)
Definition PtexTriangleKernel.h:130
PtexTriangleKernel::v1
float v1
Definition PtexTriangleKernel.h:86
PtexTriangleKernel::splitV
void splitV(PtexTriangleKernel &ka)
Definition PtexTriangleKernel.h:123
PtexTriangleKernel::splitU
void splitU(PtexTriangleKernel &ka)
Definition PtexTriangleKernel.h:116
PtexTriangleKernel::res
Res res
Definition PtexTriangleKernel.h:84
PtexTriangleKernel::getIterators
void getIterators(PtexTriangleKernelIter &ke, PtexTriangleKernelIter &ko)
Definition PtexTriangleKernel.h:188
PtexTriangleKernel::w1
float w1
Definition PtexTriangleKernel.h:86
PtexTriangleKernel::clampRes
void clampRes(Res fres)
Definition PtexTriangleKernel.h:172
PTEX_NAMESPACE_BEGIN
Definition PtexSeparableKernel.cpp:42
PtexUtils::clamp
T clamp(T x, T lo, T hi)
Definition PtexUtils.h:154
PtexUtils::min
T min(T a, T b)
Definition PtexUtils.h:148
PtexUtils::calcResFromWidth
int calcResFromWidth(float w)
Definition PtexUtils.h:103
PtexUtils::max
T max(T a, T b)
Definition PtexUtils.h:151
Ptex::ConvertToFloat
void ConvertToFloat(float *dst, const void *src, Ptex::DataType dt, int numChannels)
Convert a number of data values from the given data type to float.
Ptex::FaceInfo
Information about a face, as stored in the Ptex file header.
Definition Ptexture.h:229
Ptex::FaceInfo::res
Res res
Resolution of face.
Definition Ptexture.h:230
Ptex::FaceInfo::adjedge
EdgeId adjedge(int eid) const
Access an adjacent edge id. The eid value must be 0..3.
Definition Ptexture.h:256
Ptex::FaceInfo::adjface
int adjface(int eid) const
Access an adjacent face id. The eid value must be 0..3.
Definition Ptexture.h:259
Ptex::Res
Pixel resolution of a given texture.
Definition Ptexture.h:159
Ptex::Res::v
int v() const
V resolution in texels.
Definition Ptexture.h:176
Ptex::Res::u
int u() const
U resolution in texels.
Definition Ptexture.h:173