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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "SurfaceTexture"
#define GL_GLEXT_PROTOTYPES
#define EGL_EGLEXT_PROTOTYPES
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <gui/SurfaceTexture.h>
#include <surfaceflinger/ISurfaceComposer.h>
#include <surfaceflinger/SurfaceComposerClient.h>
#include <utils/Log.h>
namespace android {
SurfaceTexture::SurfaceTexture(GLuint tex) :
mBufferCount(MIN_BUFFER_SLOTS), mCurrentTexture(INVALID_BUFFER_SLOT),
mLastQueued(INVALID_BUFFER_SLOT), mTexName(tex) {
for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
mSlots[i].mEglImage = EGL_NO_IMAGE_KHR;
mSlots[i].mEglDisplay = EGL_NO_DISPLAY;
mSlots[i].mOwnedByClient = false;
}
}
SurfaceTexture::~SurfaceTexture() {
freeAllBuffers();
}
status_t SurfaceTexture::setBufferCount(int bufferCount) {
Mutex::Autolock lock(mMutex);
freeAllBuffers();
mBufferCount = bufferCount;
return OK;
}
sp<GraphicBuffer> SurfaceTexture::requestBuffer(int buf,
uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
Mutex::Autolock lock(mMutex);
if (buf < 0 || mBufferCount <= buf) {
LOGE("requestBuffer: slot index out of range [0, %d]: %d",
mBufferCount, buf);
return 0;
}
usage |= GraphicBuffer::USAGE_HW_TEXTURE;
sp<ISurfaceComposer> composer(ComposerService::getComposerService());
sp<GraphicBuffer> graphicBuffer(composer->createGraphicBuffer(w, h,
format, usage));
if (graphicBuffer == 0) {
LOGE("requestBuffer: SurfaceComposer::createGraphicBuffer failed");
} else {
mSlots[buf].mGraphicBuffer = graphicBuffer;
if (mSlots[buf].mEglImage != EGL_NO_IMAGE_KHR) {
eglDestroyImageKHR(mSlots[buf].mEglDisplay, mSlots[buf].mEglImage);
mSlots[buf].mEglImage = EGL_NO_IMAGE_KHR;
mSlots[buf].mEglDisplay = EGL_NO_DISPLAY;
}
}
return graphicBuffer;
}
status_t SurfaceTexture::dequeueBuffer(int *buf) {
Mutex::Autolock lock(mMutex);
int found = INVALID_BUFFER_SLOT;
for (int i = 0; i < mBufferCount; i++) {
if (!mSlots[i].mOwnedByClient && i != mCurrentTexture) {
mSlots[i].mOwnedByClient = true;
found = i;
break;
}
}
if (found == INVALID_BUFFER_SLOT) {
return -EBUSY;
}
*buf = found;
return OK;
}
status_t SurfaceTexture::queueBuffer(int buf) {
Mutex::Autolock lock(mMutex);
if (buf < 0 || mBufferCount <= buf) {
LOGE("queueBuffer: slot index out of range [0, %d]: %d",
mBufferCount, buf);
return -EINVAL;
} else if (!mSlots[buf].mOwnedByClient) {
LOGE("queueBuffer: slot %d is not owned by the client", buf);
return -EINVAL;
} else if (mSlots[buf].mGraphicBuffer == 0) {
LOGE("queueBuffer: slot %d was enqueued without requesting a buffer",
buf);
return -EINVAL;
}
mSlots[buf].mOwnedByClient = false;
mLastQueued = buf;
return OK;
}
void SurfaceTexture::cancelBuffer(int buf) {
Mutex::Autolock lock(mMutex);
if (buf < 0 || mBufferCount <= buf) {
LOGE("cancelBuffer: slot index out of range [0, %d]: %d", mBufferCount,
buf);
return;
} else if (!mSlots[buf].mOwnedByClient) {
LOGE("cancelBuffer: slot %d is not owned by the client", buf);
return;
}
mSlots[buf].mOwnedByClient = false;
}
status_t SurfaceTexture::setCrop(const Rect& reg) {
Mutex::Autolock lock(mMutex);
// XXX: How should we handle crops?
return OK;
}
status_t SurfaceTexture::setTransform(uint32_t transform) {
Mutex::Autolock lock(mMutex);
// XXX: How should we handle transforms?
return OK;
}
status_t SurfaceTexture::updateTexImage() {
Mutex::Autolock lock(mMutex);
// We always bind the texture even if we don't update its contents.
glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTexName);
// Initially both mCurrentTexture and mLastQueued are INVALID_BUFFER_SLOT,
// so this check will fail until a buffer gets queued.
if (mCurrentTexture != mLastQueued) {
// XXX: Figure out the right target.
mCurrentTexture = mLastQueued;
EGLImageKHR image = mSlots[mCurrentTexture].mEglImage;
if (image == EGL_NO_IMAGE_KHR) {
EGLDisplay dpy = eglGetCurrentDisplay();
sp<GraphicBuffer> graphicBuffer = mSlots[mCurrentTexture].mGraphicBuffer;
image = createImage(dpy, graphicBuffer);
mSlots[mCurrentTexture].mEglImage = image;
mSlots[mCurrentTexture].mEglDisplay = dpy;
}
glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, (GLeglImageOES)image);
GLint error = glGetError();
if (error != GL_NO_ERROR) {
LOGE("error binding external texture image %p (slot %d): %#04x",
image, mCurrentTexture, error);
return -EINVAL;
}
}
return OK;
}
void SurfaceTexture::freeAllBuffers() {
for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
mSlots[i].mGraphicBuffer = 0;
mSlots[i].mOwnedByClient = false;
if (mSlots[i].mEglImage != EGL_NO_IMAGE_KHR) {
eglDestroyImageKHR(mSlots[i].mEglDisplay, mSlots[i].mEglImage);
mSlots[i].mEglImage = EGL_NO_IMAGE_KHR;
mSlots[i].mEglDisplay = EGL_NO_DISPLAY;
}
}
}
EGLImageKHR SurfaceTexture::createImage(EGLDisplay dpy,
const sp<GraphicBuffer>& graphicBuffer) {
EGLClientBuffer cbuf = (EGLClientBuffer)graphicBuffer->getNativeBuffer();
EGLint attrs[] = {
EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
EGL_NONE,
};
EGLImageKHR image = eglCreateImageKHR(dpy, EGL_NO_CONTEXT,
EGL_NATIVE_BUFFER_ANDROID, cbuf, attrs);
EGLint error = eglGetError();
if (error != EGL_SUCCESS) {
LOGE("error creating EGLImage: %#x", error);
} else if (image == EGL_NO_IMAGE_KHR) {
LOGE("no error reported, but no image was returned by "
"eglCreateImageKHR");
}
return image;
}
}; // namespace android
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