Ptex: PtexTriangleKernel.cpp Source File

Ptex

PtexTriangleKernel.cpp
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2PTEX SOFTWARE
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35
36#include "PtexPlatform.h"
37#include "PtexUtils.h"
38#include "PtexHalf.h"
39#include "PtexTriangleKernel.h"
40
41 PTEX_NAMESPACE_BEGIN
42
43namespace {
44 inline float gaussian(float x_squared)
45 {
46 static const float scale = -0.5f * (PtexTriangleKernelWidth * PtexTriangleKernelWidth);
47 return (float)exp(scale * x_squared);
48 }
49
50 // apply to 1..4 channels (unrolled channel loop) of packed data (nTxChan==nChan)
51 // the ellipse equation, Q, is calculated via finite differences (Heckbert '89 pg 57)
52 template<class T, int nChan>
53 void Apply(PtexTriangleKernelIter& k, float* result, void* data, int /*nChan*/, int /*nTxChan*/)
54 {
55 int nTxChan = nChan;
56 float DDQ = 2.0f*k.A;
57 for (int vi = k.v1; vi != k.v2; vi++) {
58 int xw = k.rowlen - vi;
59 int x1 = PtexUtils::max(k.u1, xw-k.w2);
60 int x2 = PtexUtils::min(k.u2, xw-k.w1);
61 float U = (float)x1 - k.u;
62 float V = (float)vi - k.v;
63 float DQ = k.A*(2.0f*U+1.0f)+k.B*V;
64 float Q = k.A*U*U + (k.B*U + k.C*V)*V;
65 T* p = static_cast<T*>(data) + (vi * k.rowlen + x1) * nTxChan;
66 T* pEnd = p + (x2-x1)*nTxChan;
67 for (; p < pEnd; p += nTxChan) {
68 if (Q < 1.0f) {
69 float weight = gaussian(Q)*k.wscale;
70 k.weight += weight;
71 PtexUtils::VecAccum<T,nChan>()(result, p, weight);
72 }
73 Q += DQ;
74 DQ += DDQ;
75 }
76 }
77 }
78
79 // apply to 1..4 channels (unrolled channel loop) w/ pixel stride
80 template<class T, int nChan>
81 void ApplyS(PtexTriangleKernelIter& k, float* result, void* data, int /*nChan*/, int nTxChan)
82 {
83 float DDQ = 2.0f*k.A;
84 for (int vi = k.v1; vi != k.v2; vi++) {
85 int xw = k.rowlen - vi;
86 int x1 = PtexUtils::max(k.u1, xw-k.w2);
87 int x2 = PtexUtils::min(k.u2, xw-k.w1);
88 float U = (float)x1 - k.u;
89 float V = (float)vi - k.v;
90 float DQ = k.A*(2.0f*U+1.0f)+k.B*V;
91 float Q = k.A*U*U + (k.B*U + k.C*V)*V;
92 T* p = static_cast<T*>(data) + (vi * k.rowlen + x1) * nTxChan;
93 T* pEnd = p + (x2-x1)*nTxChan;
94 for (; p < pEnd; p += nTxChan) {
95 if (Q < 1.0f) {
96 float weight = gaussian(Q)*k.wscale;
97 k.weight += weight;
98 PtexUtils::VecAccum<T,nChan>()(result, p, weight);
99 }
100 Q += DQ;
101 DQ += DDQ;
102 }
103 }
104 }
105
106 // apply to N channels (general case)
107 template<class T>
108 void ApplyN(PtexTriangleKernelIter& k, float* result, void* data, int nChan, int nTxChan)
109 {
110 float DDQ = 2.0f*k.A;
111 for (int vi = k.v1; vi != k.v2; vi++) {
112 int xw = k.rowlen - vi;
113 int x1 = PtexUtils::max(k.u1, xw-k.w2);
114 int x2 = PtexUtils::min(k.u2, xw-k.w1);
115 float U = (float)x1 - k.u;
116 float V = (float)vi - k.v;
117 float DQ = k.A*(2.0f*U+1.0f)+k.B*V;
118 float Q = k.A*U*U + (k.B*U + k.C*V)*V;
119 T* p = static_cast<T*>(data) + (vi * k.rowlen + x1) * nTxChan;
120 T* pEnd = p + (x2-x1)*nTxChan;
121 for (; p < pEnd; p += nTxChan) {
122 if (Q < 1.0f) {
123 float weight = gaussian(Q)*k.wscale;
124 k.weight += weight;
125 PtexUtils::VecAccumN<T>()(result, p, nChan, weight);
126 }
127 Q += DQ;
128 DQ += DDQ;
129 }
130 }
131 }
132}
133
134
135 PtexTriangleKernelIter::ApplyFn
136 PtexTriangleKernelIter::applyFunctions[] = {
137 // nChan == nTxChan
138 ApplyN<uint8_t>, ApplyN<uint16_t>, ApplyN<PtexHalf>, ApplyN<float>,
139 Apply<uint8_t,1>, Apply<uint16_t,1>, Apply<PtexHalf,1>, Apply<float,1>,
140 Apply<uint8_t,2>, Apply<uint16_t,2>, Apply<PtexHalf,2>, Apply<float,2>,
141 Apply<uint8_t,3>, Apply<uint16_t,3>, Apply<PtexHalf,3>, Apply<float,3>,
142 Apply<uint8_t,4>, Apply<uint16_t,4>, Apply<PtexHalf,4>, Apply<float,4>,
143
144 // nChan != nTxChan (need pixel stride)
145 ApplyN<uint8_t>, ApplyN<uint16_t>, ApplyN<PtexHalf>, ApplyN<float>,
146 ApplyS<uint8_t,1>, ApplyS<uint16_t,1>, ApplyS<PtexHalf,1>, ApplyS<float,1>,
147 ApplyS<uint8_t,2>, ApplyS<uint16_t,2>, ApplyS<PtexHalf,2>, ApplyS<float,2>,
148 ApplyS<uint8_t,3>, ApplyS<uint16_t,3>, ApplyS<PtexHalf,3>, ApplyS<float,3>,
149 ApplyS<uint8_t,4>, ApplyS<uint16_t,4>, ApplyS<PtexHalf,4>, ApplyS<float,4>,
150};
151
152
153 void PtexTriangleKernelIter::applyConst(float* dst, void* data, DataType dt, int nChan)
154{
155 // iterate over texel locations and calculate weight as if texture weren't const
156 float DDQ = 2.0f*A;
157 for (int vi = v1; vi != v2; vi++) {
158 int xw = rowlen - vi;
159 int x1 = PtexUtils::max(u1, xw-w2);
160 int x2 = PtexUtils::min(u2, xw-w1);
161 float U = (float)x1 - u;
162 float V = (float)vi - v;
163 float DQ = A*(2.0f*U+1.0f)+B*V;
164 float Q = A*U*U + (B*U + C*V)*V;
165 for (int x = x1; x < x2; x++) {
166 if (Q < 1.0f) {
167 weight += gaussian(Q)*wscale;
168 }
169 Q += DQ;
170 DQ += DDQ;
171 }
172 }
173
174 // apply weight to single texel value
175 PtexUtils::applyConst(weight, dst, data, dt, nChan);
176}
177
178 PTEX_NAMESPACE_END
PtexHalf.h
Half-precision floating-point type.
PtexPlatform.h
Platform-specific classes, functions, and includes.
PtexTriangleKernel.h
PtexTriangleKernelWidth
PTEX_NAMESPACE_BEGIN const float PtexTriangleKernelWidth
Definition PtexTriangleKernel.h:50
PtexUtils.h
PTEX_NAMESPACE_END
#define PTEX_NAMESPACE_END
Definition PtexVersion.h:62
PtexTriangleKernelIter
Triangle filter kernel iterator (in texel coords)
Definition PtexTriangleKernel.h:54
PtexTriangleKernelIter::A
float A
Definition PtexTriangleKernel.h:60
PtexTriangleKernelIter::v1
int v1
Definition PtexTriangleKernel.h:58
PtexTriangleKernelIter::applyFunctions
static ApplyFn applyFunctions[40]
Definition PtexTriangleKernel.h:136
PtexTriangleKernelIter::ApplyFn
void(* ApplyFn)(PtexTriangleKernelIter &k, float *dst, void *data, int nChan, int nTxChan)
Definition PtexTriangleKernel.h:76
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::C
float C
Definition PtexTriangleKernel.h:60
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::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
PtexTriangleKernelIter::B
float B
Definition PtexTriangleKernel.h:60
PtexTriangleKernelIter::wscale
float wscale
Definition PtexTriangleKernel.h:62
PTEX_NAMESPACE_BEGIN
Definition PtexSeparableKernel.cpp:42
PTEX_NAMESPACE_BEGIN::gaussian
float gaussian(float x_squared)
Definition PtexTriangleKernel.cpp:44
PTEX_NAMESPACE_BEGIN::ApplyN
void ApplyN(PtexSeparableKernel &k, float *result, void *data, int nChan, int nTxChan)
Definition PtexSeparableKernel.cpp:105
PTEX_NAMESPACE_BEGIN::ApplyS
void ApplyS(PtexSeparableKernel &k, float *result, void *data, int, int nTxChan)
Definition PtexSeparableKernel.cpp:75
PTEX_NAMESPACE_BEGIN::Apply
void Apply(PtexSeparableKernel &k, float *result, void *data, int, int)
Definition PtexSeparableKernel.cpp:45
PtexUtils::applyConst
void applyConst(float weight, float *dst, void *data, Ptex::DataType dt, int nChan)
Definition PtexUtils.h:279
PtexUtils::min
T min(T a, T b)
Definition PtexUtils.h:148
PtexUtils::max
T max(T a, T b)
Definition PtexUtils.h:151
PtexUtils::VecAccumN
Definition PtexUtils.h:247
PtexUtils::VecAccum
Definition PtexUtils.h:233