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/*
* Copyright (C) 2024, 2025 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if USE(GBM)
#include "DMABufBuffer.h"
#include "GLDisplay.h"
#include "IntSize.h"
#include <wtf/OptionSet.h>
#include <wtf/unix/UnixFileDescriptor.h>
struct gbm_bo;
struct gbm_device;
typedef void* EGLImage;
typedef intptr_t EGLAttrib;
namespace WebCore {
class IntRect;
// Use MemoryMappedGPUBuffer to create a OpenGL texture, that's baked by a dma-buf.
class MemoryMappedGPUBuffer {
WTF_MAKE_NONCOPYABLE(MemoryMappedGPUBuffer);
WTF_DEPRECATED_MAKE_FAST_ALLOCATED();
public:
~MemoryMappedGPUBuffer();
enum class BufferFlag : uint8_t {
ForceLinear = 1 << 0
};
// Will only return a MemoryMappedGPUBuffer, if gbm_bo allocation + mapping to userland + EGLImage creation succeeded.
static std::unique_ptr<MemoryMappedGPUBuffer> create(const IntSize&, OptionSet<BufferFlag>);
const IntSize& size() const { return m_size; }
const OptionSet<BufferFlag>& flags() const { return m_flags; }
// Map dma-buf into memory, if not yet mapped.
bool mapIfNeeded();
void unmapIfNeeded();
// Export gbm_bo buffer as dma-buf and wrap in EGLImage.
EGLImage createEGLImageFromDMABuf();
// Update the underlying data of the dma-buf, as often as desired.
// You need to obtain an AccessScope, fencing the write operation.
class AccessScope;
void updateContents(AccessScope&, const void* srcData, const IntRect& targetRect, unsigned bytesPerLine);
void updateContents(AccessScope&, const MemoryMappedGPUBuffer& srcBuffer, const IntRect& targetRect);
// You need to obtain an AccessScope, fencing the read operation.
std::span<uint32_t> mappedDataSpan(AccessScope&) const;
class AccessScope {
WTF_MAKE_NONCOPYABLE(AccessScope);
WTF_DEPRECATED_MAKE_FAST_ALLOCATED();
public:
~AccessScope();
enum class Mode : bool {
Read,
Write
};
static std::unique_ptr<AccessScope> create(MemoryMappedGPUBuffer&, Mode);
const Mode& mode() const { return m_mode; }
const MemoryMappedGPUBuffer& buffer() const { return m_buffer; }
private:
AccessScope(MemoryMappedGPUBuffer&, Mode);
MemoryMappedGPUBuffer& m_buffer;
Mode m_mode { Mode::Read };
};
bool isMapped() const { return !!m_mappedData; }
bool isLinear() const;
private:
MemoryMappedGPUBuffer(const IntSize&, OptionSet<BufferFlag>);
enum class DMABufSyncFlag : uint8_t {
Start = 1 << 0,
End = 1 << 1,
Read = 1 << 2,
Write = 1 << 3
};
bool performDMABufSyncSystemCall(OptionSet<DMABufSyncFlag> flags);
bool allocate(struct gbm_device*, const GLDisplay::DMABufFormat&);
bool createDMABufFromGBMBufferObject();
UnixFileDescriptor exportGBMBufferObjectAsDMABuf(unsigned planeIndex);
int primaryPlaneDmaBufFD() const;
uint32_t primaryPlaneDmaBufStride() const;
IntSize m_size;
OptionSet<BufferFlag> m_flags;
struct gbm_bo* m_bo { nullptr };
uint64_t m_modifier { 0 };
Vector<EGLAttrib> m_eglAttributes;
RefPtr<DMABufBuffer> m_dmaBuf;
void* m_mappedData { nullptr };
uint32_t m_mappedLength { 0 };
};
inline std::unique_ptr<MemoryMappedGPUBuffer::AccessScope> makeGPUBufferReadScope(MemoryMappedGPUBuffer& buffer)
{
return MemoryMappedGPUBuffer::AccessScope::create(buffer, MemoryMappedGPUBuffer::AccessScope::Mode::Read);
}
inline std::unique_ptr<MemoryMappedGPUBuffer::AccessScope> makeGPUBufferWriteScope(MemoryMappedGPUBuffer& buffer)
{
return MemoryMappedGPUBuffer::AccessScope::create(buffer, MemoryMappedGPUBuffer::AccessScope::Mode::Write);
}
} // namespace WebCore
#endif // USE(GBM)
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