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/*
* Copyright 2010, The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER OR
* 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.
*/
#ifndef SharedTexture_h
#define SharedTexture_h
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <utils/threads.h>
namespace WebCore {
static const GLuint GL_NO_TEXTURE = 0;
/**
* TextureInfo is a class that stores both the texture and metadata about the
* texture.
*/
class TextureInfo {
public:
TextureInfo();
bool equalsAttributes(const TextureInfo* otherTexture);
void copyAttributes(const TextureInfo* sourceTexture);
bool operator==(const TextureInfo& otherTexture);
GLuint m_textureId;
int32_t m_width;
int32_t m_height;
GLenum m_internalFormat;
};
/**
* SharedTexture is a class that encapsulates all the necessary variables
* needed to share a single texture across threads. In the case that threads
* communicate using EGL's sharedContext mechanism or do not support the proper
* EGLImage extensions the targetTexture, eglImage, and isNewImage variables are
* not used.
*/
class SharedTexture {
public:
// consumer thread functions
SharedTexture();
~SharedTexture();
TextureInfo* lockSource();
void releaseSource();
TextureInfo* lockTarget();
void releaseTarget();
// these locks are only used for the methods below
void lock() { m_lock.lock(); }
void unlock() { m_lock.unlock(); }
void initSourceTexture(); // producer thread only
GLuint getSourceTextureId() { return m_sourceTexture.m_textureId; }
GLuint getTargetTextureId() { return m_targetTexture.m_textureId; }
EGLImageKHR getEGLImage() { return m_eglImage; }
private:
/**
* The mutex is used to ensure that the contents of the struct are current across
* threads and that only one thread is manipulating the texture at a given time.
*/
android::Mutex m_lock;
/**
* The texture and its associated metadata that is used by the producer. The
* texture is created in the producer's thread and can only be read by the
* consumer when the consumer shares the same context as the producer. The
* metadata is used to track changes to the texture that would orphan the
* target texture and require a new EGLImage to be constructed.
*/
TextureInfo m_sourceTexture;
/**
* The target texture stores the id and metadata of the texture that is to be
* used by the consumer. In the case where EGLImages are supported this hold
* the current eglImage target.
*/
TextureInfo m_targetTexture;
/**
* The EGLImage is used to share the texture between EGLContexts on two
* different threads. This serves as an alternative to sharing the contexts
* but is only used if GL and EGL support the required extensions.
*/
EGLImageKHR m_eglImage;
/**
* This flag is used to determine if the eglImage has been updated. This
* signals the consumer thread to rebind the targetTexture to the new image.
*/
bool m_isNewImage;
/**
* The sync allows the consumer to release the lock prior to the commands
* executing on the GPU. Prior to releasing the lock the consumer creates
* a sync object and stores it here. After locking the texture the client
* must check that the sync has completed prior to manipulating the texture.
* This value is only used if the proper EGL extensions are supported.
*/
EGLSyncKHR m_syncObject;
EGLDisplay m_display;
bool m_supportsEGLImage;
bool m_supportsEGLFenceSyncKHR;
};
} // namespace WebCore
#endif // SharedTexture_h
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