1 /*-------------------------------------------------------------------------
2 * drawElements Quality Program Tester Core
3 * ----------------------------------------
4 *
5 * Copyright 2014 The Android Open Source Project
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 *//*!
20 * \file
21 * \brief Internal utilities shared between TexLookup and TexCompare verifiers.
22 *//*--------------------------------------------------------------------*/
23
24 #include "tcuTexVerifierUtil.hpp"
25 #include "tcuFloat.hpp"
26
27 namespace tcu
28 {
29 namespace TexVerifierUtil
30 {
31
computeFloatingPointError(const float value,const int numAccurateBits)32 float computeFloatingPointError (const float value, const int numAccurateBits)
33 {
34 const int numGarbageBits = 23-numAccurateBits;
35 const deUint32 mask = (1u<<numGarbageBits)-1u;
36 const int exp = tcu::Float32(value).exponent();
37
38 return Float32::construct(+1, exp, (1u<<23) | mask).asFloat() - Float32::construct(+1, exp, 1u<<23).asFloat();
39 }
40
computeFixedPointError(const int numAccurateBits)41 float computeFixedPointError (const int numAccurateBits)
42 {
43 return computeFloatingPointError(1.0f, numAccurateBits);
44 }
45
computeNonNormalizedCoordBounds(const bool normalizedCoords,const int dim,const float coord,const int coordBits,const int uvBits)46 Vec2 computeNonNormalizedCoordBounds (const bool normalizedCoords, const int dim, const float coord, const int coordBits, const int uvBits)
47 {
48 const float coordErr = computeFloatingPointError(coord, coordBits);
49 const float minN = coord - coordErr;
50 const float maxN = coord + coordErr;
51 const float minA = normalizedCoords ? minN*float(dim) : minN;
52 const float maxA = normalizedCoords ? maxN*float(dim) : maxN;
53 const float minC = minA - computeFixedPointError(uvBits);
54 const float maxC = maxA + computeFixedPointError(uvBits);
55
56 DE_ASSERT(minC <= maxC);
57
58 return Vec2(minC, maxC);
59 }
60
getPossibleCubeFaces(const Vec3 & coord,const IVec3 & bits,CubeFace * faces,int & numFaces)61 void getPossibleCubeFaces (const Vec3& coord, const IVec3& bits, CubeFace* faces, int& numFaces)
62 {
63 const float x = coord.x();
64 const float y = coord.y();
65 const float z = coord.z();
66 const float ax = de::abs(x);
67 const float ay = de::abs(y);
68 const float az = de::abs(z);
69 const float ex = computeFloatingPointError(x, bits.x());
70 const float ey = computeFloatingPointError(y, bits.y());
71 const float ez = computeFloatingPointError(z, bits.z());
72
73 numFaces = 0;
74
75 if (ay+ey < ax-ex && az+ez < ax-ex)
76 {
77 if (x >= ex) faces[numFaces++] = CUBEFACE_POSITIVE_X;
78 if (x <= ex) faces[numFaces++] = CUBEFACE_NEGATIVE_X;
79 }
80 else if (ax+ex < ay-ey && az+ez < ay-ey)
81 {
82 if (y >= ey) faces[numFaces++] = CUBEFACE_POSITIVE_Y;
83 if (y <= ey) faces[numFaces++] = CUBEFACE_NEGATIVE_Y;
84 }
85 else if (ax+ex < az-ez && ay+ey < az-ez)
86 {
87 if (z >= ez) faces[numFaces++] = CUBEFACE_POSITIVE_Z;
88 if (z <= ez) faces[numFaces++] = CUBEFACE_NEGATIVE_Z;
89 }
90 else
91 {
92 // One or more components are equal (or within error bounds). Allow all faces where major axis is not zero.
93 if (ax > ex)
94 {
95 faces[numFaces++] = CUBEFACE_NEGATIVE_X;
96 faces[numFaces++] = CUBEFACE_POSITIVE_X;
97 }
98
99 if (ay > ey)
100 {
101 faces[numFaces++] = CUBEFACE_NEGATIVE_Y;
102 faces[numFaces++] = CUBEFACE_POSITIVE_Y;
103 }
104
105 if (az > ez)
106 {
107 faces[numFaces++] = CUBEFACE_NEGATIVE_Z;
108 faces[numFaces++] = CUBEFACE_POSITIVE_Z;
109 }
110 }
111 }
112
getUnnormalizedCoordSampler(const Sampler & sampler)113 Sampler getUnnormalizedCoordSampler (const Sampler& sampler)
114 {
115 Sampler copy = sampler;
116 copy.normalizedCoords = false;
117 return copy;
118 }
119
imod(int a,int b)120 static inline int imod (int a, int b)
121 {
122 int m = a % b;
123 return m < 0 ? m + b : m;
124 }
125
mirror(int a)126 static inline int mirror (int a)
127 {
128 return a >= 0 ? a : -(1 + a);
129 }
130
wrap(Sampler::WrapMode mode,int c,int size)131 int wrap (Sampler::WrapMode mode, int c, int size)
132 {
133 switch (mode)
134 {
135 // \note CL and GL modes are handled identically here, as verification process accounts for
136 // accuracy differences caused by different methods (wrapping vs. denormalizing first).
137 case tcu::Sampler::CLAMP_TO_BORDER:
138 return deClamp32(c, -1, size);
139
140 case tcu::Sampler::CLAMP_TO_EDGE:
141 return deClamp32(c, 0, size-1);
142
143 case tcu::Sampler::REPEAT_GL:
144 case tcu::Sampler::REPEAT_CL:
145 return imod(c, size);
146
147 case tcu::Sampler::MIRRORED_ONCE:
148 c = deClamp32(c, -size, size);
149 // Fall-through
150
151 case tcu::Sampler::MIRRORED_REPEAT_GL:
152 case tcu::Sampler::MIRRORED_REPEAT_CL:
153 return (size - 1) - mirror(imod(c, 2*size) - size);
154
155 default:
156 DE_ASSERT(DE_FALSE);
157 return 0;
158 }
159 }
160 } // TexVerifierUtil
161 } // tcu
162