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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/metal/SamplerMTL.h"
#include "dawn_native/metal/DeviceMTL.h"
#include "dawn_native/metal/UtilsMetal.h"
namespace dawn::native::metal {
namespace {
MTLSamplerMinMagFilter FilterModeToMinMagFilter(wgpu::FilterMode mode) {
switch (mode) {
case wgpu::FilterMode::Nearest:
return MTLSamplerMinMagFilterNearest;
case wgpu::FilterMode::Linear:
return MTLSamplerMinMagFilterLinear;
}
}
MTLSamplerMipFilter FilterModeToMipFilter(wgpu::FilterMode mode) {
switch (mode) {
case wgpu::FilterMode::Nearest:
return MTLSamplerMipFilterNearest;
case wgpu::FilterMode::Linear:
return MTLSamplerMipFilterLinear;
}
}
MTLSamplerAddressMode AddressMode(wgpu::AddressMode mode) {
switch (mode) {
case wgpu::AddressMode::Repeat:
return MTLSamplerAddressModeRepeat;
case wgpu::AddressMode::MirrorRepeat:
return MTLSamplerAddressModeMirrorRepeat;
case wgpu::AddressMode::ClampToEdge:
return MTLSamplerAddressModeClampToEdge;
}
}
}
// static
ResultOrError<Ref<Sampler>> Sampler::Create(Device* device,
const SamplerDescriptor* descriptor) {
DAWN_INVALID_IF(
descriptor->compare != wgpu::CompareFunction::Undefined &&
device->IsToggleEnabled(Toggle::MetalDisableSamplerCompare),
"Sampler compare function (%s) not supported. Compare functions are disabled with the "
"Metal backend.",
descriptor->compare);
Ref<Sampler> sampler = AcquireRef(new Sampler(device, descriptor));
DAWN_TRY(sampler->Initialize(descriptor));
return sampler;
}
MaybeError Sampler::Initialize(const SamplerDescriptor* descriptor) {
NSRef<MTLSamplerDescriptor> mtlDescRef = AcquireNSRef([MTLSamplerDescriptor new]);
MTLSamplerDescriptor* mtlDesc = mtlDescRef.Get();
mtlDesc.minFilter = FilterModeToMinMagFilter(descriptor->minFilter);
mtlDesc.magFilter = FilterModeToMinMagFilter(descriptor->magFilter);
mtlDesc.mipFilter = FilterModeToMipFilter(descriptor->mipmapFilter);
mtlDesc.sAddressMode = AddressMode(descriptor->addressModeU);
mtlDesc.tAddressMode = AddressMode(descriptor->addressModeV);
mtlDesc.rAddressMode = AddressMode(descriptor->addressModeW);
mtlDesc.lodMinClamp = descriptor->lodMinClamp;
mtlDesc.lodMaxClamp = descriptor->lodMaxClamp;
// https://developer.apple.com/documentation/metal/mtlsamplerdescriptor/1516164-maxanisotropy
mtlDesc.maxAnisotropy = std::min<uint16_t>(GetMaxAnisotropy(), 16u);
if (descriptor->compare != wgpu::CompareFunction::Undefined) {
// Sampler compare is unsupported before A9, which we validate in
// Sampler::Create.
mtlDesc.compareFunction = ToMetalCompareFunction(descriptor->compare);
// The value is default-initialized in the else-case, and we don't set it or the
// Metal debug device errors.
}
mMtlSamplerState = AcquireNSPRef(
[ToBackend(GetDevice())->GetMTLDevice() newSamplerStateWithDescriptor:mtlDesc]);
if (mMtlSamplerState == nil) {
return DAWN_OUT_OF_MEMORY_ERROR("Failed to allocate sampler.");
}
return {};
}
id<MTLSamplerState> Sampler::GetMTLSamplerState() {
return mMtlSamplerState.Get();
}
} // namespace dawn::native::metal