gecko/gfx/gl/SharedSurface.h

304 lines
7.4 KiB
C++

/* -*- Mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40; -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* SharedSurface abstracts an actual surface (can be a GL texture, but
* not necessarily) that handles sharing.
* Its specializations are:
* SharedSurface_Basic (client-side bitmap, does readback)
* SharedSurface_GLTexture
* SharedSurface_EGLImage
* SharedSurface_ANGLEShareHandle
*/
#ifndef SHARED_SURFACE_H_
#define SHARED_SURFACE_H_
#include <queue>
#include <stdint.h>
#include "GLContextTypes.h"
#include "GLDefs.h"
#include "mozilla/Attributes.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/WeakPtr.h"
#include "ScopedGLHelpers.h"
#include "SurfaceTypes.h"
class nsIThread;
namespace mozilla {
namespace gfx {
class DrawTarget;
}
namespace gl {
class GLContext;
class SurfaceFactory;
class ShSurfHandle;
class SharedSurface
{
public:
static void ProdCopy(SharedSurface* src, SharedSurface* dest,
SurfaceFactory* factory);
const SharedSurfaceType mType;
const AttachmentType mAttachType;
GLContext* const mGL;
const gfx::IntSize mSize;
const bool mHasAlpha;
protected:
bool mIsLocked;
bool mIsProducerAcquired;
bool mIsConsumerAcquired;
DebugOnly<nsIThread* const> mOwningThread;
SharedSurface(SharedSurfaceType type,
AttachmentType attachType,
GLContext* gl,
const gfx::IntSize& size,
bool hasAlpha);
public:
virtual ~SharedSurface() {
}
bool IsLocked() const {
return mIsLocked;
}
// This locks the SharedSurface as the production buffer for the context.
// This is needed by backends which use PBuffers and/or EGLSurfaces.
void LockProd();
// Unlocking is harmless if we're already unlocked.
void UnlockProd();
protected:
virtual void LockProdImpl() = 0;
virtual void UnlockProdImpl() = 0;
virtual void ProducerAcquireImpl() {}
virtual void ProducerReleaseImpl() {
Fence();
}
virtual void ConsumerAcquireImpl() {
WaitSync();
}
virtual void ConsumerReleaseImpl() {}
public:
void ProducerAcquire() {
MOZ_ASSERT(!mIsProducerAcquired);
ProducerAcquireImpl();
mIsProducerAcquired = true;
}
void ProducerRelease() {
MOZ_ASSERT(mIsProducerAcquired);
ProducerReleaseImpl();
mIsProducerAcquired = false;
}
void ConsumerAcquire() {
MOZ_ASSERT(!mIsConsumerAcquired);
ConsumerAcquireImpl();
mIsConsumerAcquired = true;
}
void ConsumerRelease() {
MOZ_ASSERT(mIsConsumerAcquired);
ConsumerReleaseImpl();
mIsConsumerAcquired = false;
}
virtual void Fence() = 0;
virtual bool WaitSync() = 0;
virtual bool PollSync() = 0;
// Use these if you can. They can only be called from the Content
// thread, though!
void Fence_ContentThread();
bool WaitSync_ContentThread();
bool PollSync_ContentThread();
protected:
virtual void Fence_ContentThread_Impl() {
Fence();
}
virtual bool WaitSync_ContentThread_Impl() {
return WaitSync();
}
virtual bool PollSync_ContentThread_Impl() {
return PollSync();
}
public:
// This function waits until the buffer is no longer being used.
// To optimize the performance, some implementaions recycle SharedSurfaces
// even when its buffer is still being used.
virtual void WaitForBufferOwnership() {}
// For use when AttachType is correct.
virtual GLenum ProdTextureTarget() const {
MOZ_ASSERT(mAttachType == AttachmentType::GLTexture);
return LOCAL_GL_TEXTURE_2D;
}
virtual GLuint ProdTexture() {
MOZ_ASSERT(mAttachType == AttachmentType::GLTexture);
MOZ_CRASH("Did you forget to override this function?");
}
virtual GLuint ProdRenderbuffer() {
MOZ_ASSERT(mAttachType == AttachmentType::GLRenderbuffer);
MOZ_CRASH("Did you forget to override this function?");
}
virtual bool CopyTexImage2D(GLenum target, GLint level, GLenum internalformat, GLint x,
GLint y, GLsizei width, GLsizei height, GLint border)
{
return false;
}
virtual bool ReadPixels(GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
GLvoid* pixels)
{
return false;
}
virtual bool NeedsIndirectReads() const {
return false;
}
};
template<typename T>
class UniquePtrQueue
{
std::queue<T*> mQueue;
public:
~UniquePtrQueue() {
MOZ_ASSERT(Empty());
}
bool Empty() const {
return mQueue.empty();
}
void Push(UniquePtr<T> up) {
T* p = up.release();
mQueue.push(p);
}
UniquePtr<T> Pop() {
UniquePtr<T> ret;
if (!mQueue.empty()) {
ret.reset(mQueue.front());
mQueue.pop();
}
return Move(ret);
}
};
class SurfaceFactory : public SupportsWeakPtr<SurfaceFactory>
{
public:
// Should use the VIRTUAL version, but it's currently incompatible
// with SupportsWeakPtr. (bug 1049278)
MOZ_DECLARE_REFCOUNTED_TYPENAME(SurfaceFactory)
GLContext* const mGL;
const SurfaceCaps mCaps;
const SharedSurfaceType mType;
const GLFormats mFormats;
protected:
SurfaceCaps mDrawCaps;
SurfaceCaps mReadCaps;
SurfaceFactory(GLContext* gl,
SharedSurfaceType type,
const SurfaceCaps& caps);
public:
virtual ~SurfaceFactory();
const SurfaceCaps& DrawCaps() const {
return mDrawCaps;
}
const SurfaceCaps& ReadCaps() const {
return mReadCaps;
}
protected:
virtual UniquePtr<SharedSurface> CreateShared(const gfx::IntSize& size) = 0;
UniquePtrQueue<SharedSurface> mScraps;
public:
UniquePtr<SharedSurface> NewSharedSurface(const gfx::IntSize& size);
TemporaryRef<ShSurfHandle> NewShSurfHandle(const gfx::IntSize& size);
// Auto-deletes surfs of the wrong type.
void Recycle(UniquePtr<SharedSurface> surf);
};
class ShSurfHandle : public RefCounted<ShSurfHandle>
{
public:
MOZ_DECLARE_REFCOUNTED_TYPENAME(ShSurfHandle)
private:
const WeakPtr<SurfaceFactory> mFactory;
UniquePtr<SharedSurface> mSurf;
public:
ShSurfHandle(SurfaceFactory* factory, UniquePtr<SharedSurface> surf)
: mFactory(factory)
, mSurf(Move(surf))
{
MOZ_ASSERT(mFactory);
MOZ_ASSERT(mSurf);
}
~ShSurfHandle() {
if (mFactory) {
mFactory->Recycle(Move(mSurf));
}
}
SharedSurface* Surf() const {
MOZ_ASSERT(mSurf.get());
return mSurf.get();
}
};
class ScopedReadbackFB
{
GLContext* const mGL;
ScopedBindFramebuffer mAutoFB;
GLuint mTempFB;
GLuint mTempTex;
SharedSurface* mSurfToUnlock;
SharedSurface* mSurfToLock;
public:
explicit ScopedReadbackFB(SharedSurface* src);
~ScopedReadbackFB();
};
bool ReadbackSharedSurface(SharedSurface* src, gfx::DrawTarget* dst);
uint32_t ReadPixel(SharedSurface* src);
} // namespace gl
} // namespace mozilla
#endif // SHARED_SURFACE_H_