/*------------------------------------------------------------------------- * drawElements Quality Program Tester Core * ---------------------------------------- * * Copyright 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * *//*! * \file * \brief Internal utilities shared between TexLookup and TexCompare verifiers. *//*--------------------------------------------------------------------*/ #include "tcuTexVerifierUtil.hpp" #include "tcuFloat.hpp" namespace tcu { namespace TexVerifierUtil { float computeFloatingPointError (const float value, const int numAccurateBits) { const int numGarbageBits = 23-numAccurateBits; const deUint32 mask = (1u<<numGarbageBits)-1u; const int exp = tcu::Float32(value).exponent(); return Float32::construct(+1, exp, (1u<<23) | mask).asFloat() - Float32::construct(+1, exp, 1u<<23).asFloat(); } float computeFixedPointError (const int numAccurateBits) { return computeFloatingPointError(1.0f, numAccurateBits); } Vec2 computeNonNormalizedCoordBounds (const bool normalizedCoords, const int dim, const float coord, const int coordBits, const int uvBits) { const float coordErr = computeFloatingPointError(coord, coordBits); const float minN = coord - coordErr; const float maxN = coord + coordErr; const float minA = normalizedCoords ? minN*float(dim) : minN; const float maxA = normalizedCoords ? maxN*float(dim) : maxN; const float minC = minA - computeFixedPointError(uvBits); const float maxC = maxA + computeFixedPointError(uvBits); DE_ASSERT(minC <= maxC); return Vec2(minC, maxC); } void getPossibleCubeFaces (const Vec3& coord, const IVec3& bits, CubeFace* faces, int& numFaces) { const float x = coord.x(); const float y = coord.y(); const float z = coord.z(); const float ax = de::abs(x); const float ay = de::abs(y); const float az = de::abs(z); const float ex = computeFloatingPointError(x, bits.x()); const float ey = computeFloatingPointError(y, bits.y()); const float ez = computeFloatingPointError(z, bits.z()); numFaces = 0; if (ay+ey < ax-ex && az+ez < ax-ex) { if (x >= ex) faces[numFaces++] = CUBEFACE_POSITIVE_X; if (x <= ex) faces[numFaces++] = CUBEFACE_NEGATIVE_X; } else if (ax+ex < ay-ey && az+ez < ay-ey) { if (y >= ey) faces[numFaces++] = CUBEFACE_POSITIVE_Y; if (y <= ey) faces[numFaces++] = CUBEFACE_NEGATIVE_Y; } else if (ax+ex < az-ez && ay+ey < az-ez) { if (z >= ez) faces[numFaces++] = CUBEFACE_POSITIVE_Z; if (z <= ez) faces[numFaces++] = CUBEFACE_NEGATIVE_Z; } else { // One or more components are equal (or within error bounds). Allow all faces where major axis is not zero. if (ax > ex) { faces[numFaces++] = CUBEFACE_NEGATIVE_X; faces[numFaces++] = CUBEFACE_POSITIVE_X; } if (ay > ey) { faces[numFaces++] = CUBEFACE_NEGATIVE_Y; faces[numFaces++] = CUBEFACE_POSITIVE_Y; } if (az > ez) { faces[numFaces++] = CUBEFACE_NEGATIVE_Z; faces[numFaces++] = CUBEFACE_POSITIVE_Z; } } } Sampler getUnnormalizedCoordSampler (const Sampler& sampler) { Sampler copy = sampler; copy.normalizedCoords = false; return copy; } static inline int imod (int a, int b) { int m = a % b; return m < 0 ? m + b : m; } static inline int mirror (int a) { return a >= 0.0f ? a : -(1 + a); } int wrap (Sampler::WrapMode mode, int c, int size) { switch (mode) { // \note CL and GL modes are handled identically here, as verification process accounts for // accuracy differences caused by different methods (wrapping vs. denormalizing first). case tcu::Sampler::CLAMP_TO_BORDER: return deClamp32(c, -1, size); case tcu::Sampler::CLAMP_TO_EDGE: return deClamp32(c, 0, size-1); case tcu::Sampler::REPEAT_GL: case tcu::Sampler::REPEAT_CL: return imod(c, size); case tcu::Sampler::MIRRORED_ONCE: c = deClamp32(c, -size, size); // Fall-through case tcu::Sampler::MIRRORED_REPEAT_GL: case tcu::Sampler::MIRRORED_REPEAT_CL: return (size - 1) - mirror(imod(c, 2*size) - size); default: DE_ASSERT(DE_FALSE); return 0; } } } // TexVerifierUtil } // tcu