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//
// Copyright 2002 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Buffer.h: Defines the gl::Buffer class, representing storage of vertex and/or
// index data. Implements GL buffer objects and related functionality.
// [OpenGL ES 2.0.24] section 2.9 page 21.
#ifndef LIBANGLE_BUFFER_H_
#define LIBANGLE_BUFFER_H_
#include "common/PackedEnums.h"
#include "common/angleutils.h"
#include "libANGLE/Debug.h"
#include "libANGLE/Error.h"
#include "libANGLE/IndexRangeCache.h"
#include "libANGLE/Observer.h"
#include "libANGLE/RefCountObject.h"
#include "libANGLE/angletypes.h"
namespace rx
{
class BufferImpl;
class GLImplFactory;
} // namespace rx
namespace gl
{
class Buffer;
class Context;
class BufferState final : angle::NonCopyable
{
public:
BufferState();
~BufferState();
BufferUsage getUsage() const { return mUsage; }
GLbitfield getAccessFlags() const { return mAccessFlags; }
GLenum getAccess() const { return mAccess; }
GLboolean isMapped() const { return mMapped; }
void *getMapPointer() const { return mMapPointer; }
GLint64 getMapOffset() const { return mMapOffset; }
GLint64 getMapLength() const { return mMapLength; }
GLint64 getSize() const { return mSize; }
bool isBoundForTransformFeedback() const { return mTransformFeedbackIndexedBindingCount != 0; }
std::string getLabel() const { return mLabel; }
private:
friend class Buffer;
std::string mLabel;
BufferUsage mUsage;
GLint64 mSize;
GLbitfield mAccessFlags;
GLenum mAccess;
GLboolean mMapped;
void *mMapPointer;
GLint64 mMapOffset;
GLint64 mMapLength;
int mBindingCount;
int mTransformFeedbackIndexedBindingCount;
int mTransformFeedbackGenericBindingCount;
GLboolean mImmutable;
GLbitfield mStorageExtUsageFlags;
GLboolean mExternal;
};
// Some Vertex Array Objects track buffer data updates.
struct ContentsObserver
{
VertexArray *vertexArray = nullptr;
uint32_t bufferIndex = 0;
};
ANGLE_INLINE bool operator==(const ContentsObserver &lhs, const ContentsObserver &rhs)
{
return lhs.vertexArray == rhs.vertexArray && lhs.bufferIndex == rhs.bufferIndex;
}
class Buffer final : public RefCountObject<BufferID>,
public LabeledObject,
public angle::ObserverInterface,
public angle::Subject
{
public:
Buffer(rx::GLImplFactory *factory, BufferID id);
~Buffer() override;
void onDestroy(const Context *context) override;
angle::Result setLabel(const Context *context, const std::string &label) override;
const std::string &getLabel() const override;
angle::Result bufferStorageExternal(Context *context,
BufferBinding target,
GLsizeiptr size,
GLeglClientBufferEXT clientBuffer,
GLbitfield flags);
angle::Result bufferStorage(Context *context,
BufferBinding target,
GLsizeiptr size,
const void *data,
GLbitfield flags);
angle::Result bufferData(Context *context,
BufferBinding target,
const void *data,
GLsizeiptr size,
BufferUsage usage);
angle::Result bufferSubData(const Context *context,
BufferBinding target,
const void *data,
GLsizeiptr size,
GLintptr offset);
angle::Result copyBufferSubData(const Context *context,
Buffer *source,
GLintptr sourceOffset,
GLintptr destOffset,
GLsizeiptr size);
angle::Result map(const Context *context, GLenum access);
angle::Result mapRange(const Context *context,
GLintptr offset,
GLsizeiptr length,
GLbitfield access);
angle::Result unmap(const Context *context, GLboolean *result);
// These are called when another operation changes Buffer data.
void onDataChanged();
angle::Result getIndexRange(const gl::Context *context,
DrawElementsType type,
size_t offset,
size_t count,
bool primitiveRestartEnabled,
IndexRange *outRange) const;
const BufferState &getState() const { return mState; }
BufferUsage getUsage() const { return mState.mUsage; }
GLbitfield getAccessFlags() const { return mState.mAccessFlags; }
GLenum getAccess() const { return mState.mAccess; }
GLboolean isMapped() const { return mState.mMapped; }
bool isPersistentlyMapped() const
{
return (mState.mStorageExtUsageFlags & GL_MAP_PERSISTENT_BIT_EXT) != 0;
}
void *getMapPointer() const { return mState.mMapPointer; }
GLint64 getMapOffset() const { return mState.mMapOffset; }
GLint64 getMapLength() const { return mState.mMapLength; }
GLint64 getSize() const { return mState.mSize; }
GLint64 getMemorySize() const;
GLboolean isImmutable() const { return mState.mImmutable; }
GLbitfield getStorageExtUsageFlags() const { return mState.mStorageExtUsageFlags; }
// Buffers are always initialized immediately when allocated
InitState initState() const { return InitState::Initialized; }
rx::BufferImpl *getImplementation() const { return mImpl; }
// Note: we pass "isWebGL" to this function to clarify it's only valid if WebGL is enabled.
// We pass the boolean flag instead of the pointer because this header can't read Context.h.
ANGLE_INLINE bool hasWebGLXFBBindingConflict(bool isWebGL) const
{
if (!isWebGL)
{
return false;
}
// The transform feedback generic binding point is not an indexed binding point but it also
// does not count as a non-transform-feedback use of the buffer, so we subtract it from the
// binding count when checking if the buffer is bound to a non-transform-feedback location.
// See https://crbug.com/853978
return mState.mTransformFeedbackIndexedBindingCount > 0 &&
mState.mTransformFeedbackIndexedBindingCount !=
mState.mBindingCount - mState.mTransformFeedbackGenericBindingCount;
}
bool isDoubleBoundForTransformFeedback() const;
void onTFBindingChanged(const Context *context, bool bound, bool indexed);
void onNonTFBindingChanged(int incr) { mState.mBindingCount += incr; }
angle::Result getSubData(const gl::Context *context,
GLintptr offset,
GLsizeiptr size,
void *outData);
// angle::ObserverInterface implementation.
void onSubjectStateChange(angle::SubjectIndex index, angle::SubjectMessage message) override;
void addContentsObserver(VertexArray *vertexArray, uint32_t bufferIndex);
void removeContentsObserver(VertexArray *vertexArray, uint32_t bufferIndex);
private:
angle::Result bufferDataImpl(Context *context,
BufferBinding target,
const void *data,
GLsizeiptr size,
BufferUsage usage,
GLbitfield flags);
angle::Result bufferExternalDataImpl(Context *context,
BufferBinding target,
GLeglClientBufferEXT clientBuffer,
GLsizeiptr size,
GLbitfield flags);
void onContentsChange();
size_t getContentsObserverIndex(VertexArray *vertexArray, uint32_t bufferIndex) const;
BufferState mState;
rx::BufferImpl *mImpl;
angle::ObserverBinding mImplObserver;
angle::FastVector<ContentsObserver, angle::kMaxFixedObservers> mContentsObservers;
mutable IndexRangeCache mIndexRangeCache;
};
} // namespace gl
#endif // LIBANGLE_BUFFER_H_
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