SurfaceTexture.cpp revision d369dc42506ec003f1839bb9e27edada411324b5 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "SurfaceTexture"
18//#define LOG_NDEBUG 0
19
20#define GL_GLEXT_PROTOTYPES
21#define EGL_EGLEXT_PROTOTYPES
22
23#include <EGL/egl.h>
24#include <EGL/eglext.h>
25#include <GLES2/gl2.h>
26#include <GLES2/gl2ext.h>
27
28#include <gui/SurfaceTexture.h>
29
30#include <surfaceflinger/ISurfaceComposer.h>
31#include <surfaceflinger/SurfaceComposerClient.h>
32
33#include <utils/Log.h>
34
35namespace android {
36
37SurfaceTexture::SurfaceTexture(GLuint tex) :
38    mBufferCount(MIN_BUFFER_SLOTS), mCurrentTexture(INVALID_BUFFER_SLOT),
39    mLastQueued(INVALID_BUFFER_SLOT), mTexName(tex) {
40    LOGV("SurfaceTexture::SurfaceTexture");
41    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
42        mSlots[i].mEglImage = EGL_NO_IMAGE_KHR;
43        mSlots[i].mEglDisplay = EGL_NO_DISPLAY;
44        mSlots[i].mOwnedByClient = false;
45    }
46}
47
48SurfaceTexture::~SurfaceTexture() {
49    LOGV("SurfaceTexture::~SurfaceTexture");
50    freeAllBuffers();
51}
52
53status_t SurfaceTexture::setBufferCount(int bufferCount) {
54    LOGV("SurfaceTexture::setBufferCount");
55    Mutex::Autolock lock(mMutex);
56    freeAllBuffers();
57    mBufferCount = bufferCount;
58    mCurrentTexture = INVALID_BUFFER_SLOT;
59    mLastQueued = INVALID_BUFFER_SLOT;
60    return OK;
61}
62
63sp<GraphicBuffer> SurfaceTexture::requestBuffer(int buf,
64        uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
65    LOGV("SurfaceTexture::requestBuffer");
66    Mutex::Autolock lock(mMutex);
67    if (buf < 0 || mBufferCount <= buf) {
68        LOGE("requestBuffer: slot index out of range [0, %d]: %d",
69                mBufferCount, buf);
70        return 0;
71    }
72    usage |= GraphicBuffer::USAGE_HW_TEXTURE;
73    sp<ISurfaceComposer> composer(ComposerService::getComposerService());
74    sp<GraphicBuffer> graphicBuffer(composer->createGraphicBuffer(w, h,
75            format, usage));
76    if (graphicBuffer == 0) {
77        LOGE("requestBuffer: SurfaceComposer::createGraphicBuffer failed");
78    } else {
79        mSlots[buf].mGraphicBuffer = graphicBuffer;
80        if (mSlots[buf].mEglImage != EGL_NO_IMAGE_KHR) {
81            eglDestroyImageKHR(mSlots[buf].mEglDisplay, mSlots[buf].mEglImage);
82            mSlots[buf].mEglImage = EGL_NO_IMAGE_KHR;
83            mSlots[buf].mEglDisplay = EGL_NO_DISPLAY;
84        }
85    }
86    return graphicBuffer;
87}
88
89status_t SurfaceTexture::dequeueBuffer(int *buf) {
90    LOGV("SurfaceTexture::dequeueBuffer");
91    Mutex::Autolock lock(mMutex);
92    int found = INVALID_BUFFER_SLOT;
93    for (int i = 0; i < mBufferCount; i++) {
94        if (!mSlots[i].mOwnedByClient && i != mCurrentTexture) {
95            mSlots[i].mOwnedByClient = true;
96            found = i;
97            break;
98        }
99    }
100    if (found == INVALID_BUFFER_SLOT) {
101        return -EBUSY;
102    }
103    *buf = found;
104    return OK;
105}
106
107status_t SurfaceTexture::queueBuffer(int buf) {
108    LOGV("SurfaceTexture::queueBuffer");
109    Mutex::Autolock lock(mMutex);
110    if (buf < 0 || mBufferCount <= buf) {
111        LOGE("queueBuffer: slot index out of range [0, %d]: %d",
112                mBufferCount, buf);
113        return -EINVAL;
114    } else if (!mSlots[buf].mOwnedByClient) {
115        LOGE("queueBuffer: slot %d is not owned by the client", buf);
116        return -EINVAL;
117    } else if (mSlots[buf].mGraphicBuffer == 0) {
118        LOGE("queueBuffer: slot %d was enqueued without requesting a buffer",
119                buf);
120        return -EINVAL;
121    }
122    mSlots[buf].mOwnedByClient = false;
123    mLastQueued = buf;
124    return OK;
125}
126
127void SurfaceTexture::cancelBuffer(int buf) {
128    LOGV("SurfaceTexture::cancelBuffer");
129    Mutex::Autolock lock(mMutex);
130    if (buf < 0 || mBufferCount <= buf) {
131        LOGE("cancelBuffer: slot index out of range [0, %d]: %d", mBufferCount,
132                buf);
133        return;
134    } else if (!mSlots[buf].mOwnedByClient) {
135        LOGE("cancelBuffer: slot %d is not owned by the client", buf);
136        return;
137    }
138    mSlots[buf].mOwnedByClient = false;
139}
140
141status_t SurfaceTexture::setCrop(const Rect& reg) {
142    LOGV("SurfaceTexture::setCrop");
143    Mutex::Autolock lock(mMutex);
144    // XXX: How should we handle crops?
145    return OK;
146}
147
148status_t SurfaceTexture::setTransform(uint32_t transform) {
149    LOGV("SurfaceTexture::setTransform");
150    Mutex::Autolock lock(mMutex);
151    // XXX: How should we handle transforms?
152    return OK;
153}
154
155status_t SurfaceTexture::updateTexImage() {
156    LOGV("SurfaceTexture::updateTexImage");
157    Mutex::Autolock lock(mMutex);
158
159    // We always bind the texture even if we don't update its contents.
160    glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTexName);
161
162    // Initially both mCurrentTexture and mLastQueued are INVALID_BUFFER_SLOT,
163    // so this check will fail until a buffer gets queued.
164    if (mCurrentTexture != mLastQueued) {
165        // XXX: Figure out the right target.
166        mCurrentTexture = mLastQueued;
167        EGLImageKHR image = mSlots[mCurrentTexture].mEglImage;
168        if (image == EGL_NO_IMAGE_KHR) {
169            EGLDisplay dpy = eglGetCurrentDisplay();
170            sp<GraphicBuffer> graphicBuffer = mSlots[mCurrentTexture].mGraphicBuffer;
171            image = createImage(dpy, graphicBuffer);
172            mSlots[mCurrentTexture].mEglImage = image;
173            mSlots[mCurrentTexture].mEglDisplay = dpy;
174        }
175        glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, (GLeglImageOES)image);
176        GLint error = glGetError();
177        if (error != GL_NO_ERROR) {
178            LOGE("error binding external texture image %p (slot %d): %#04x",
179                    image, mCurrentTexture, error);
180            return -EINVAL;
181        }
182    }
183    return OK;
184}
185
186void SurfaceTexture::freeAllBuffers() {
187    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
188        mSlots[i].mGraphicBuffer = 0;
189        mSlots[i].mOwnedByClient = false;
190        if (mSlots[i].mEglImage != EGL_NO_IMAGE_KHR) {
191            eglDestroyImageKHR(mSlots[i].mEglDisplay, mSlots[i].mEglImage);
192            mSlots[i].mEglImage = EGL_NO_IMAGE_KHR;
193            mSlots[i].mEglDisplay = EGL_NO_DISPLAY;
194        }
195    }
196}
197
198EGLImageKHR SurfaceTexture::createImage(EGLDisplay dpy,
199        const sp<GraphicBuffer>& graphicBuffer) {
200    EGLClientBuffer cbuf = (EGLClientBuffer)graphicBuffer->getNativeBuffer();
201    EGLint attrs[] = {
202        EGL_IMAGE_PRESERVED_KHR,    EGL_TRUE,
203        EGL_NONE,
204    };
205    EGLImageKHR image = eglCreateImageKHR(dpy, EGL_NO_CONTEXT,
206            EGL_NATIVE_BUFFER_ANDROID, cbuf, attrs);
207    EGLint error = eglGetError();
208    if (error != EGL_SUCCESS) {
209        LOGE("error creating EGLImage: %#x", error);
210    } else if (image == EGL_NO_IMAGE_KHR) {
211        LOGE("no error reported, but no image was returned by "
212                "eglCreateImageKHR");
213    }
214    return image;
215}
216
217}; // namespace android
218