blob: 18980b8460a85ce4ba7484d230172c37c6af7192 [file] [log] [blame]
// 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.
#include "dawn_native/PassResourceUsageTracker.h"
#include "dawn_native/Buffer.h"
#include "dawn_native/Texture.h"
namespace dawn_native {
void PassResourceUsageTracker::BufferUsedAs(BufferBase* buffer, wgpu::BufferUsage usage) {
// std::map's operator[] will create the key and return 0 if the key didn't exist
// before.
mBufferUsages[buffer] |= usage;
}
void PassResourceUsageTracker::TextureUsedAs(TextureBase* texture, wgpu::TextureUsage usage) {
// std::map's operator[] will create the key and return 0 if the key didn't exist
// before.
mTextureUsages[texture] |= usage;
}
MaybeError PassResourceUsageTracker::ValidateComputePassUsages() const {
return ValidateUsages();
}
MaybeError PassResourceUsageTracker::ValidateRenderPassUsages() const {
return ValidateUsages();
}
// Performs the per-pass usage validation checks
MaybeError PassResourceUsageTracker::ValidateUsages() const {
// Buffers can only be used as single-write or multiple read.
for (auto& it : mBufferUsages) {
BufferBase* buffer = it.first;
wgpu::BufferUsage usage = it.second;
if (usage & ~buffer->GetUsage()) {
return DAWN_VALIDATION_ERROR("Buffer missing usage for the pass");
}
bool readOnly = (usage & kReadOnlyBufferUsages) == usage;
bool singleUse = wgpu::HasZeroOrOneBits(usage);
if (!readOnly && !singleUse) {
return DAWN_VALIDATION_ERROR(
"Buffer used as writable usage and another usage in pass");
}
}
// Textures can only be used as single-write or multiple read.
// TODO(cwallez@chromium.org): implement per-subresource tracking
for (auto& it : mTextureUsages) {
TextureBase* texture = it.first;
wgpu::TextureUsage usage = it.second;
if (usage & ~texture->GetUsage()) {
return DAWN_VALIDATION_ERROR("Texture missing usage for the pass");
}
// For textures the only read-only usage in a pass is Sampled, so checking the
// usage constraint simplifies to checking a single usage bit is set.
if (!wgpu::HasZeroOrOneBits(it.second)) {
return DAWN_VALIDATION_ERROR("Texture used with more than one usage in pass");
}
}
return {};
}
// Returns the per-pass usage for use by backends for APIs with explicit barriers.
PassResourceUsage PassResourceUsageTracker::AcquireResourceUsage() {
PassResourceUsage result;
result.buffers.reserve(mBufferUsages.size());
result.bufferUsages.reserve(mBufferUsages.size());
result.textures.reserve(mTextureUsages.size());
result.textureUsages.reserve(mTextureUsages.size());
for (auto& it : mBufferUsages) {
result.buffers.push_back(it.first);
result.bufferUsages.push_back(it.second);
}
for (auto& it : mTextureUsages) {
result.textures.push_back(it.first);
result.textureUsages.push_back(it.second);
}
return result;
}
} // namespace dawn_native