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// Copyright 2019 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.
#ifndef SRC_DAWN_NATIVE_BINDGROUPTRACKER_H_
#define SRC_DAWN_NATIVE_BINDGROUPTRACKER_H_
#include <algorithm>
#include <array>
#include <bitset>
#include "dawn/common/Constants.h"
#include "dawn/native/BindGroupLayout.h"
#include "dawn/native/Pipeline.h"
#include "dawn/native/PipelineLayout.h"
namespace dawn::native {
// Keeps track of the dirty bind groups so they can be lazily applied when we know the
// pipeline state or it changes.
// |DynamicOffset| is a template parameter because offsets in Vulkan are uint32_t but uint64_t
// in other backends.
template <bool CanInheritBindGroups, typename DynamicOffset>
class BindGroupTrackerBase {
public:
void OnSetBindGroup(BindGroupIndex index,
BindGroupBase* bindGroup,
uint32_t dynamicOffsetCount,
uint32_t* dynamicOffsets) {
ASSERT(index < kMaxBindGroupsTyped);
if (mBindGroupLayoutsMask[index]) {
// It is okay to only dirty bind groups that are used by the current pipeline
// layout. If the pipeline layout changes, then the bind groups it uses will
// become dirty.
if (mBindGroups[index] != bindGroup) {
mDirtyBindGroups.set(index);
mDirtyBindGroupsObjectChangedOrIsDynamic.set(index);
}
if (dynamicOffsetCount > 0) {
mDirtyBindGroupsObjectChangedOrIsDynamic.set(index);
}
}
mBindGroups[index] = bindGroup;
mDynamicOffsets[index].resize(BindingIndex(dynamicOffsetCount));
std::copy(dynamicOffsets, dynamicOffsets + dynamicOffsetCount,
mDynamicOffsets[index].begin());
}
void OnSetPipeline(PipelineBase* pipeline) { mPipelineLayout = pipeline->GetLayout(); }
protected:
// The Derived class should call this before it applies bind groups.
void BeforeApply() {
if (mLastAppliedPipelineLayout == mPipelineLayout) {
return;
}
// Use the bind group layout mask to avoid marking unused bind groups as dirty.
mBindGroupLayoutsMask = mPipelineLayout->GetBindGroupLayoutsMask();
// Changing the pipeline layout sets bind groups as dirty. If CanInheritBindGroups,
// the first |k| matching bind groups may be inherited.
if (CanInheritBindGroups && mLastAppliedPipelineLayout != nullptr) {
// Dirty bind groups that cannot be inherited.
BindGroupLayoutMask dirtiedGroups =
~mPipelineLayout->InheritedGroupsMask(mLastAppliedPipelineLayout);
mDirtyBindGroups |= dirtiedGroups;
mDirtyBindGroupsObjectChangedOrIsDynamic |= dirtiedGroups;
// Clear any bind groups not in the mask.
mDirtyBindGroups &= mBindGroupLayoutsMask;
mDirtyBindGroupsObjectChangedOrIsDynamic &= mBindGroupLayoutsMask;
} else {
mDirtyBindGroups = mBindGroupLayoutsMask;
mDirtyBindGroupsObjectChangedOrIsDynamic = mBindGroupLayoutsMask;
}
}
// The Derived class should call this after it applies bind groups.
void AfterApply() {
// Reset all dirty bind groups. Dirty bind groups not in the bind group layout mask
// will be dirtied again by the next pipeline change.
mDirtyBindGroups.reset();
mDirtyBindGroupsObjectChangedOrIsDynamic.reset();
// Keep track of the last applied pipeline layout. This allows us to avoid computing
// the intersection of the dirty bind groups and bind group layout mask in next Draw
// or Dispatch (which is very hot code) until the layout is changed again.
mLastAppliedPipelineLayout = mPipelineLayout;
}
BindGroupLayoutMask mDirtyBindGroups = 0;
BindGroupLayoutMask mDirtyBindGroupsObjectChangedOrIsDynamic = 0;
BindGroupLayoutMask mBindGroupLayoutsMask = 0;
ityp::array<BindGroupIndex, BindGroupBase*, kMaxBindGroups> mBindGroups = {};
ityp::array<BindGroupIndex, ityp::vector<BindingIndex, DynamicOffset>, kMaxBindGroups>
mDynamicOffsets = {};
// |mPipelineLayout| is the current pipeline layout set on the command buffer.
// |mLastAppliedPipelineLayout| is the last pipeline layout for which we applied changes
// to the bind group bindings.
PipelineLayoutBase* mPipelineLayout = nullptr;
PipelineLayoutBase* mLastAppliedPipelineLayout = nullptr;
};
} // namespace dawn::native
#endif // SRC_DAWN_NATIVE_BINDGROUPTRACKER_H_