Ptex: PtexTriangleKernel.cpp Source File

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PtexTriangleKernel.cpp
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1 /*
2 PTEX SOFTWARE
3 Copyright 2009 Disney Enterprises, Inc. All rights reserved
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are
7 met:
8
9 * Redistributions of source code must retain the above copyright
10 notice, this list of conditions and the following disclaimer.
11
12 * Redistributions in binary form must reproduce the above copyright
13 notice, this list of conditions and the following disclaimer in
14 the documentation and/or other materials provided with the
15 distribution.
16
17 * The names "Disney", "Walt Disney Pictures", "Walt Disney Animation
18 Studios" or the names of its contributors may NOT be used to
19 endorse or promote products derived from this software without
20 specific prior written permission from Walt Disney Pictures.
21
22 Disclaimer: THIS SOFTWARE IS PROVIDED BY WALT DISNEY PICTURES AND
23 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
24 BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
25 FOR A PARTICULAR PURPOSE, NONINFRINGEMENT AND TITLE ARE DISCLAIMED.
26 IN NO EVENT SHALL WALT DISNEY PICTURES, THE COPYRIGHT HOLDER OR
27 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND BASED ON ANY
31 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
34 */
35
36 #include "PtexPlatform.h"
37 #include "PtexUtils.h"
38 #include "PtexHalf.h"
39 #include "PtexTriangleKernel.h"
40
41
42 namespace {
43 inline float gaussian(float x_squared)
44 {
45 static const float scale = -0.5f * (PtexTriangleKernelWidth * PtexTriangleKernelWidth);
46 return (float)exp(scale * x_squared);
47 }
48 }
49
50
51 namespace {
52
53 // apply to 1..4 channels (unrolled channel loop) of packed data (nTxChan==nChan)
54 // the ellipse equation, Q, is calculated via finite differences (Heckbert '89 pg 57)
55 template<class T, int nChan>
56 void Apply(PtexTriangleKernelIter& k, float* result, void* data, int /*nChan*/, int /*nTxChan*/)
57 {
58 int nTxChan = nChan;
59 float DDQ = 2.0f*k.A;
60 for (int vi = k.v1; vi != k.v2; vi++) {
61 int xw = k.rowlen - vi;
62 int x1 = PtexUtils::max(k.u1, xw-k.w2);
63 int x2 = PtexUtils::min(k.u2, xw-k.w1);
64 float U = (float)x1 - k.u;
65 float V = (float)vi - k.v;
66 float DQ = k.A*(2.0f*U+1.0f)+k.B*V;
67 float Q = k.A*U*U + (k.B*U + k.C*V)*V;
68 T* p = (T*)data + (vi * k.rowlen + x1) * nTxChan;
69 T* pEnd = p + (x2-x1)*nTxChan;
70 for (; p < pEnd; p += nTxChan) {
71 if (Q < 1.0f) {
72 float weight = gaussian(Q)*k.wscale;
73 k.weight += weight;
74 PtexUtils::VecAccum<T,nChan>()(result, p, weight);
75 }
76 Q += DQ;
77 DQ += DDQ;
78 }
79 }
80 }
81
82 // apply to 1..4 channels (unrolled channel loop) w/ pixel stride
83 template<class T, int nChan>
84 void ApplyS(PtexTriangleKernelIter& k, float* result, void* data, int /*nChan*/, int nTxChan)
85 {
86 float DDQ = 2.0f*k.A;
87 for (int vi = k.v1; vi != k.v2; vi++) {
88 int xw = k.rowlen - vi;
89 int x1 = PtexUtils::max(k.u1, xw-k.w2);
90 int x2 = PtexUtils::min(k.u2, xw-k.w1);
91 float U = (float)x1 - k.u;
92 float V = (float)vi - k.v;
93 float DQ = k.A*(2.0f*U+1.0f)+k.B*V;
94 float Q = k.A*U*U + (k.B*U + k.C*V)*V;
95 T* p = (T*)data + (vi * k.rowlen + x1) * nTxChan;
96 T* pEnd = p + (x2-x1)*nTxChan;
97 for (; p < pEnd; p += nTxChan) {
98 if (Q < 1.0f) {
99 float weight = gaussian(Q)*k.wscale;
100 k.weight += weight;
101 PtexUtils::VecAccum<T,nChan>()(result, p, weight);
102 }
103 Q += DQ;
104 DQ += DDQ;
105 }
106 }
107 }
108
109 // apply to N channels (general case)
110 template<class T>
111 void ApplyN(PtexTriangleKernelIter& k, float* result, void* data, int nChan, int nTxChan)
112 {
113 float DDQ = 2.0f*k.A;
114 for (int vi = k.v1; vi != k.v2; vi++) {
115 int xw = k.rowlen - vi;
116 int x1 = PtexUtils::max(k.u1, xw-k.w2);
117 int x2 = PtexUtils::min(k.u2, xw-k.w1);
118 float U = (float)x1 - k.u;
119 float V = (float)vi - k.v;
120 float DQ = k.A*(2.0f*U+1.0f)+k.B*V;
121 float Q = k.A*U*U + (k.B*U + k.C*V)*V;
122 T* p = (T*)data + (vi * k.rowlen + x1) * nTxChan;
123 T* pEnd = p + (x2-x1)*nTxChan;
124 for (; p < pEnd; p += nTxChan) {
125 if (Q < 1.0f) {
126 float weight = gaussian(Q)*k.wscale;
127 k.weight += weight;
128 PtexUtils::VecAccumN<T>()(result, p, nChan, weight);
129 }
130 Q += DQ;
131 DQ += DDQ;
132 }
133 }
134 }
135 }
136
137
138 PtexTriangleKernelIter::ApplyFn
139 PtexTriangleKernelIter::applyFunctions[] = {
140 // nChan == nTxChan
141 ApplyN<uint8_t>, ApplyN<uint16_t>, ApplyN<PtexHalf>, ApplyN<float>,
142 Apply<uint8_t,1>, Apply<uint16_t,1>, Apply<PtexHalf,1>, Apply<float,1>,
143 Apply<uint8_t,2>, Apply<uint16_t,2>, Apply<PtexHalf,2>, Apply<float,2>,
144 Apply<uint8_t,3>, Apply<uint16_t,3>, Apply<PtexHalf,3>, Apply<float,3>,
145 Apply<uint8_t,4>, Apply<uint16_t,4>, Apply<PtexHalf,4>, Apply<float,4>,
146
147 // nChan != nTxChan (need pixel stride)
148 ApplyN<uint8_t>, ApplyN<uint16_t>, ApplyN<PtexHalf>, ApplyN<float>,
149 ApplyS<uint8_t,1>, ApplyS<uint16_t,1>, ApplyS<PtexHalf,1>, ApplyS<float,1>,
150 ApplyS<uint8_t,2>, ApplyS<uint16_t,2>, ApplyS<PtexHalf,2>, ApplyS<float,2>,
151 ApplyS<uint8_t,3>, ApplyS<uint16_t,3>, ApplyS<PtexHalf,3>, ApplyS<float,3>,
152 ApplyS<uint8_t,4>, ApplyS<uint16_t,4>, ApplyS<PtexHalf,4>, ApplyS<float,4>,
153 };
154
155
156 void PtexTriangleKernelIter::applyConst(float* dst, void* data, DataType dt, int nChan)
157 {
158 // iterate over texel locations and calculate weight as if texture weren't const
159 float DDQ = 2.0f*A;
160 for (int vi = v1; vi != v2; vi++) {
161 int xw = rowlen - vi;
162 int x1 = PtexUtils::max(u1, xw-w2);
163 int x2 = PtexUtils::min(u2, xw-w1);
164 float U = (float)x1 - u;
165 float V = (float)vi - v;
166 float DQ = A*(2.0f*U+1.0f)+B*V;
167 float Q = A*U*U + (B*U + C*V)*V;
168 for (int x = x1; x < x2; x++) {
169 if (Q < 1.0f) {
170 weight += gaussian(Q)*wscale;
171 }
172 Q += DQ;
173 DQ += DDQ;
174 }
175 }
176
177 // apply weight to single texel value
178 PtexUtils::applyConst(weight, dst, data, dt, nChan);
179 }
PtexTriangleKernelIter::applyConst
void applyConst(float *dst, void *data, DataType dt, int nChan)
Definition: PtexTriangleKernel.cpp:156
PtexTriangleKernelIter::rowlen
int rowlen
Definition: PtexTriangleKernel.h:54
PtexTriangleKernel.h
PtexTriangleKernelIter::weight
float weight
Definition: PtexTriangleKernel.h:61
Ptex::DataType
DataType
Type of data stored in texture file.
Definition: Ptexture.h:83
PtexTriangleKernelIter::wscale
float wscale
Definition: PtexTriangleKernel.h:60
PtexUtils::min
static T min(T a, T b)
Definition: PtexUtils.h:116
PtexTriangleKernelIter::v
float v
Definition: PtexTriangleKernel.h:55
PtexTriangleKernelIter
Triangle filter kernel iterator (in texel coords)
Definition: PtexTriangleKernel.h:52
PtexPlatform.h
Platform-specific classes, functions, and includes.
PtexUtils::VecAccumN
Definition: PtexUtils.h:172
PtexTriangleKernelIter::v2
int v2
Definition: PtexTriangleKernel.h:57
PtexTriangleKernelIter::u2
int u2
Definition: PtexTriangleKernel.h:57
PtexTriangleKernelIter::w2
int w2
Definition: PtexTriangleKernel.h:57
PtexTriangleKernelIter::applyFunctions
static ApplyFn applyFunctions[40]
Definition: PtexTriangleKernel.h:75
PtexTriangleKernelIter::C
float C
Definition: PtexTriangleKernel.h:58
PtexTriangleKernelIter::u1
int u1
Definition: PtexTriangleKernel.h:56
PtexTriangleKernelIter::w1
int w1
Definition: PtexTriangleKernel.h:56
PtexTriangleKernelIter::B
float B
Definition: PtexTriangleKernel.h:58
PtexTriangleKernelIter::A
float A
Definition: PtexTriangleKernel.h:58
PtexTriangleKernelIter::ApplyFn
void(* ApplyFn)(PtexTriangleKernelIter &k, float *dst, void *data, int nChan, int nTxChan)
Definition: PtexTriangleKernel.h:74
PtexTriangleKernelIter::u
float u
Definition: PtexTriangleKernel.h:55
PtexUtils::VecAccum
Definition: PtexUtils.h:158
PtexTriangleKernelWidth
static const float PtexTriangleKernelWidth
Definition: PtexTriangleKernel.h:48
PtexHalf.h
Half-precision floating-point type.
PtexUtils.h
PtexTriangleKernelIter::v1
int v1
Definition: PtexTriangleKernel.h:56
PtexUtils::applyConst
static void applyConst(float weight, float *dst, void *data, Ptex::DataType dt, int nChan)
Definition: PtexUtils.h:204
PtexUtils::max
static T max(T a, T b)
Definition: PtexUtils.h:119