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// Copyright 2017 The Dawn Authors
//
// 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.
#include "dawn_native/Sampler.h"
#include "dawn_native/Device.h"
#include "dawn_native/ObjectContentHasher.h"
#include "dawn_native/ValidationUtils_autogen.h"
#include <cmath>
namespace dawn_native {
MaybeError ValidateSamplerDescriptor(DeviceBase*, const SamplerDescriptor* descriptor) {
if (descriptor->nextInChain != nullptr) {
return DAWN_VALIDATION_ERROR("nextInChain must be nullptr");
}
if (std::isnan(descriptor->lodMinClamp) || std::isnan(descriptor->lodMaxClamp)) {
return DAWN_VALIDATION_ERROR("LOD clamp bounds must not be NaN");
}
if (descriptor->lodMinClamp < 0 || descriptor->lodMaxClamp < 0) {
return DAWN_VALIDATION_ERROR("LOD clamp bounds must be positive");
}
if (descriptor->lodMinClamp > descriptor->lodMaxClamp) {
return DAWN_VALIDATION_ERROR(
"Min lod clamp value cannot greater than max lod clamp value");
}
if (descriptor->maxAnisotropy > 1) {
if (descriptor->minFilter != wgpu::FilterMode::Linear ||
descriptor->magFilter != wgpu::FilterMode::Linear ||
descriptor->mipmapFilter != wgpu::FilterMode::Linear) {
return DAWN_VALIDATION_ERROR(
"min, mag, and mipmap filter should be linear when using anisotropic "
"filtering");
}
} else if (descriptor->maxAnisotropy == 0u) {
return DAWN_VALIDATION_ERROR("max anisotropy cannot be set to 0");
}
DAWN_TRY(ValidateFilterMode(descriptor->minFilter));
DAWN_TRY(ValidateFilterMode(descriptor->magFilter));
DAWN_TRY(ValidateFilterMode(descriptor->mipmapFilter));
DAWN_TRY(ValidateAddressMode(descriptor->addressModeU));
DAWN_TRY(ValidateAddressMode(descriptor->addressModeV));
DAWN_TRY(ValidateAddressMode(descriptor->addressModeW));
// CompareFunction::Undefined is tagged as invalid because it can't be used, except for the
// SamplerDescriptor where it is a special value that means the sampler is not a
// comparison-sampler.
if (descriptor->compare != wgpu::CompareFunction::Undefined) {
DAWN_TRY(ValidateCompareFunction(descriptor->compare));
}
return {};
}
// SamplerBase
SamplerBase::SamplerBase(DeviceBase* device, const SamplerDescriptor* descriptor)
: CachedObject(device),
mAddressModeU(descriptor->addressModeU),
mAddressModeV(descriptor->addressModeV),
mAddressModeW(descriptor->addressModeW),
mMagFilter(descriptor->magFilter),
mMinFilter(descriptor->minFilter),
mMipmapFilter(descriptor->mipmapFilter),
mLodMinClamp(descriptor->lodMinClamp),
mLodMaxClamp(descriptor->lodMaxClamp),
mCompareFunction(descriptor->compare),
mMaxAnisotropy(descriptor->maxAnisotropy) {
}
SamplerBase::SamplerBase(DeviceBase* device, ObjectBase::ErrorTag tag)
: CachedObject(device, tag) {
}
SamplerBase::~SamplerBase() {
if (IsCachedReference()) {
GetDevice()->UncacheSampler(this);
}
}
// static
SamplerBase* SamplerBase::MakeError(DeviceBase* device) {
return new SamplerBase(device, ObjectBase::kError);
}
bool SamplerBase::IsComparison() const {
return mCompareFunction != wgpu::CompareFunction::Undefined;
}
bool SamplerBase::IsFiltering() const {
return mMinFilter == wgpu::FilterMode::Linear || mMagFilter == wgpu::FilterMode::Linear ||
mMipmapFilter == wgpu::FilterMode::Linear;
}
size_t SamplerBase::ComputeContentHash() {
ObjectContentHasher recorder;
recorder.Record(mAddressModeU, mAddressModeV, mAddressModeW, mMagFilter, mMinFilter,
mMipmapFilter, mLodMinClamp, mLodMaxClamp, mCompareFunction,
mMaxAnisotropy);
return recorder.GetContentHash();
}
bool SamplerBase::EqualityFunc::operator()(const SamplerBase* a, const SamplerBase* b) const {
if (a == b) {
return true;
}
ASSERT(!std::isnan(a->mLodMinClamp));
ASSERT(!std::isnan(b->mLodMinClamp));
ASSERT(!std::isnan(a->mLodMaxClamp));
ASSERT(!std::isnan(b->mLodMaxClamp));
return a->mAddressModeU == b->mAddressModeU && a->mAddressModeV == b->mAddressModeV &&
a->mAddressModeW == b->mAddressModeW && a->mMagFilter == b->mMagFilter &&
a->mMinFilter == b->mMinFilter && a->mMipmapFilter == b->mMipmapFilter &&
a->mLodMinClamp == b->mLodMinClamp && a->mLodMaxClamp == b->mLodMaxClamp &&
a->mCompareFunction == b->mCompareFunction && a->mMaxAnisotropy == b->mMaxAnisotropy;
}
} // namespace dawn_native