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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.
*/
#include "config.h"
#include "DoubleBufferedTexture.h"
#include "GLUtils.h"
#define LOG_NDEBUG 1
#define LOG_TAG "DoubleBufferedTexture.cpp"
#include <utils/Log.h>
namespace WebCore {
DoubleBufferedTexture::DoubleBufferedTexture(EGLContext sharedContext)
{
// the mutex ensures that the variables are not used in any other thread
// until the constructor has the opportunity to initialize them
android::Mutex::Autolock lock(m_varLock);
m_display = eglGetCurrentDisplay();
m_pContext = EGL_NO_CONTEXT;
m_cContext = sharedContext;
m_writeableTexture = GL_NO_TEXTURE;
m_lockedConsumerTexture = GL_NO_TEXTURE;
m_supportsEGLImage = GLUtils::isEGLImageSupported();
}
SharedTexture* DoubleBufferedTexture::getWriteableTexture()
{
return (m_writeableTexture == &m_textureA) ? &m_textureA : &m_textureB;
}
SharedTexture* DoubleBufferedTexture::getReadableTexture()
{
return (m_writeableTexture != &m_textureA) ? &m_textureA : &m_textureB;
}
EGLContext DoubleBufferedTexture::producerAcquireContext()
{
// ensure that the constructor has completed and all values are initialized
android::Mutex::Autolock lock(m_varLock);
if (m_pContext != EGL_NO_CONTEXT) {
LOGV("AquireContext has previously generated a context.\n");
return m_pContext;
}
// check to see if a context already exists on this thread
EGLContext context = eglGetCurrentContext();
// if no context exists then create one
if (context == EGL_NO_CONTEXT) {
EGLContext sharedContext = m_supportsEGLImage ? EGL_NO_CONTEXT : m_cContext;
context = GLUtils::createBackgroundContext(sharedContext);
}
if (context == EGL_NO_CONTEXT) {
LOGE("eglCreateContext failed");
return EGL_NO_CONTEXT;
}
// initialize the producer's textures
m_textureA.lock();
m_textureB.lock();
m_textureA.initSourceTexture();
m_textureB.initSourceTexture();
LOGV("Initialized Textures A/B (%d:%d)", m_textureA.getSourceTextureId(),
m_textureB.getSourceTextureId());
m_textureA.unlock();
m_textureB.unlock();
// select a front buffer
m_writeableTexture = &m_textureA;
m_pContext = context;
return context;
}
TextureInfo* DoubleBufferedTexture::producerLock()
{
SharedTexture* sharedTex = getWriteableTexture();
LOGV("Acquiring P Lock (%d)", sharedTex->getSourceTextureId());
TextureInfo* texInfo = sharedTex->lockSource();
LOGV("Acquired P Lock");
return texInfo;
}
void DoubleBufferedTexture::producerRelease()
{
// get the front texture and cache the id
SharedTexture* sharedTex = getWriteableTexture();
LOGV("Releasing P Lock (%d)", sharedTex->getSourceTextureId());
sharedTex->releaseSource();
// swap the front and back buffers
m_varLock.lock();
m_writeableTexture = (sharedTex == &m_textureA) ? &m_textureB : &m_textureA;
LOGV("Released P Lock (%d)", sharedTex->getSourceTextureId());
m_varLock.unlock();
}
TextureInfo* DoubleBufferedTexture::consumerLock()
{
m_varLock.lock();
SharedTexture* sharedTex = getReadableTexture();
LOGV("Acquiring C Lock (%d)", sharedTex->getSourceTextureId());
m_lockedConsumerTexture = sharedTex;
m_varLock.unlock();
TextureInfo* texInfo = sharedTex->lockTarget();
LOGV("Acquired C Lock");
if (!texInfo)
LOGV("Released C Lock (Empty)");
return texInfo;
}
void DoubleBufferedTexture::consumerRelease()
{
android::Mutex::Autolock lock(m_varLock);
// we must check to see what texture the consumer had locked since the
// producer may have swapped out the front buffer
SharedTexture* sharedTex = m_lockedConsumerTexture;
sharedTex->releaseTarget();
LOGV("Released C Lock (%d)", sharedTex->getSourceTextureId());
}
} // namespace WebCore
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