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Buffer: Always use MappedAtCreation state when applicable. 

In a follow-up CL we need to know if the buffer is in the
MappedAtCreation state for validation of GetMappedRange. Having the
state not 100% reflect the state in the spec meant that validation if
GetMappedRange would fail for buffers mapped at creation for which
IsMapWritable is true.

Bug: dawn:445
Change-Id: I4a64335a708b838526da8d65f907b21c782816e0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/23981
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
This commit is contained in:
Corentin Wallez 2020-06-30 11:05:44 +00:00 committed by Commit Bot service account
parent bae16b4df9
commit 2008d15326
1 changed files with 8 additions and 7 deletions
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15
src/dawn_native/Buffer.cpp
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@ -163,16 +163,15 @@ namespace dawn_native {
ASSERT(!IsError());
ASSERT(mappedPointer != nullptr);
mState = BufferState::MappedAtCreation;
// Mappable buffers don't use a staging buffer and are just as if mapped through MapAsync.
if (IsMapWritable()) {
DAWN_TRY(MapAtCreationImpl(mappedPointer));
mState = BufferState::Mapped;
ASSERT(*mappedPointer != nullptr);
return {};
}
mState = BufferState::MappedAtCreation;
// 0-sized buffers are not supposed to be written to, Return back any non-null pointer.
if (mSize == 0) {
*mappedPointer = reinterpret_cast<uint8_t*>(intptr_t(0xCAFED00D));
@ -322,8 +321,9 @@ namespace dawn_native {
} else if (mState == BufferState::MappedAtCreation) {
if (mStagingBuffer != nullptr) {
mStagingBuffer.reset();
} else {
ASSERT(mSize == 0);
} else if (mSize != 0) {
ASSERT(IsMapWritable());
Unmap();
}
}
@ -371,8 +371,9 @@ namespace dawn_native {
} else if (mState == BufferState::MappedAtCreation) {
if (mStagingBuffer != nullptr) {
GetDevice()->ConsumedError(CopyFromStagingBuffer());
} else {
ASSERT(mSize == 0);
} else if (mSize != 0) {
ASSERT(IsMapWritable());
UnmapImpl();
}
}