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/*
* Copyright 2019-2021 Diligent Graphics LLC
* Copyright 2015-2019 Egor Yusov
*
* 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.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#include "DynamicBuffer.hpp"
#include <algorithm>
#include "DebugUtilities.hpp"
namespace Diligent
{
DynamicBuffer::DynamicBuffer(IRenderDevice* pDevice, const BufferDesc& Desc) :
m_Desc{Desc},
m_Name{Desc.Name != nullptr ? Desc.Name : "Dynamic buffer"}
{
m_Desc.Name = m_Name.c_str();
if (m_Desc.uiSizeInBytes > 0 && pDevice != nullptr)
{
pDevice->CreateBuffer(Desc, nullptr, &m_pBuffer);
VERIFY_EXPR(m_pBuffer);
}
}
void DynamicBuffer::CommitResize(IRenderDevice* pDevice,
IDeviceContext* pContext)
{
if (!m_pBuffer && m_Desc.uiSizeInBytes > 0 && pDevice != nullptr)
{
pDevice->CreateBuffer(m_Desc, nullptr, &m_pBuffer);
VERIFY_EXPR(m_pBuffer);
++m_Version;
}
if (m_pStaleBuffer && m_pBuffer && pContext != nullptr)
{
auto CopySize = std::min(m_Desc.uiSizeInBytes, m_pStaleBuffer->GetDesc().uiSizeInBytes);
pContext->CopyBuffer(m_pStaleBuffer, 0, RESOURCE_STATE_TRANSITION_MODE_TRANSITION,
m_pBuffer, 0, CopySize, RESOURCE_STATE_TRANSITION_MODE_TRANSITION);
m_pStaleBuffer.Release();
}
}
IBuffer* DynamicBuffer::Resize(IRenderDevice* pDevice,
IDeviceContext* pContext,
Uint32 NewSize)
{
if (m_Desc.uiSizeInBytes != NewSize)
{
if (!m_pStaleBuffer)
m_pStaleBuffer = std::move(m_pBuffer);
else
{
DEV_CHECK_ERR(!m_pBuffer || NewSize == 0,
"There is a non-null stale buffer. This likely indicates that "
"Resize() has been called multiple times with different sizes, "
"but copy has not been committed by providing non-null device "
"context to either Resize() or GetBuffer()");
}
m_Desc.uiSizeInBytes = NewSize;
if (m_Desc.uiSizeInBytes == 0)
{
m_pStaleBuffer.Release();
m_pBuffer.Release();
}
}
CommitResize(pDevice, pContext);
return m_pBuffer;
}
IBuffer* DynamicBuffer::GetBuffer(IRenderDevice* pDevice,
IDeviceContext* pContext)
{
DEV_CHECK_ERR(m_pBuffer || m_Desc.uiSizeInBytes == 0 || pDevice != nullptr,
"A new buffer must be created, but pDevice is null. Use PendingUpdate() to check if the buffer must be updated.");
DEV_CHECK_ERR(!m_pStaleBuffer || pContext != nullptr,
"An existing contents of the buffer must be copied to the new buffer, but pContext is null. "
"Use PendingUpdate() to check if the buffer must be updated.");
CommitResize(pDevice, pContext);
return m_pBuffer;
}
} // namespace Diligent
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