GLConsumer.cpp revision e70d8b43938e17beebcc0c97a9373a1906f6f2bf 
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    return OK;
59}
60
61sp<GraphicBuffer> SurfaceTexture::requestBuffer(int buf,
62        uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
63    LOGV("SurfaceTexture::requestBuffer");
64    Mutex::Autolock lock(mMutex);
65    if (buf < 0 || mBufferCount <= buf) {
66        LOGE("requestBuffer: slot index out of range [0, %d]: %d",
67                mBufferCount, buf);
68        return 0;
69    }
70    usage |= GraphicBuffer::USAGE_HW_TEXTURE;
71    sp<ISurfaceComposer> composer(ComposerService::getComposerService());
72    sp<GraphicBuffer> graphicBuffer(composer->createGraphicBuffer(w, h,
73            format, usage));
74    if (graphicBuffer == 0) {
75        LOGE("requestBuffer: SurfaceComposer::createGraphicBuffer failed");
76    } else {
77        mSlots[buf].mGraphicBuffer = graphicBuffer;
78        if (mSlots[buf].mEglImage != EGL_NO_IMAGE_KHR) {
79            eglDestroyImageKHR(mSlots[buf].mEglDisplay, mSlots[buf].mEglImage);
80            mSlots[buf].mEglImage = EGL_NO_IMAGE_KHR;
81            mSlots[buf].mEglDisplay = EGL_NO_DISPLAY;
82        }
83    }
84    return graphicBuffer;
85}
86
87status_t SurfaceTexture::dequeueBuffer(int *buf) {
88    LOGV("SurfaceTexture::dequeueBuffer");
89    Mutex::Autolock lock(mMutex);
90    int found = INVALID_BUFFER_SLOT;
91    for (int i = 0; i < mBufferCount; i++) {
92        if (!mSlots[i].mOwnedByClient && i != mCurrentTexture) {
93            mSlots[i].mOwnedByClient = true;
94            found = i;
95            break;
96        }
97    }
98    if (found == INVALID_BUFFER_SLOT) {
99        return -EBUSY;
100    }
101    *buf = found;
102    return OK;
103}
104
105status_t SurfaceTexture::queueBuffer(int buf) {
106    LOGV("SurfaceTexture::queueBuffer");
107    Mutex::Autolock lock(mMutex);
108    if (buf < 0 || mBufferCount <= buf) {
109        LOGE("queueBuffer: slot index out of range [0, %d]: %d",
110                mBufferCount, buf);
111        return -EINVAL;
112    } else if (!mSlots[buf].mOwnedByClient) {
113        LOGE("queueBuffer: slot %d is not owned by the client", buf);
114        return -EINVAL;
115    } else if (mSlots[buf].mGraphicBuffer == 0) {
116        LOGE("queueBuffer: slot %d was enqueued without requesting a buffer",
117                buf);
118        return -EINVAL;
119    }
120    mSlots[buf].mOwnedByClient = false;
121    mLastQueued = buf;
122    return OK;
123}
124
125void SurfaceTexture::cancelBuffer(int buf) {
126    LOGV("SurfaceTexture::cancelBuffer");
127    Mutex::Autolock lock(mMutex);
128    if (buf < 0 || mBufferCount <= buf) {
129        LOGE("cancelBuffer: slot index out of range [0, %d]: %d", mBufferCount,
130                buf);
131        return;
132    } else if (!mSlots[buf].mOwnedByClient) {
133        LOGE("cancelBuffer: slot %d is not owned by the client", buf);
134        return;
135    }
136    mSlots[buf].mOwnedByClient = false;
137}
138
139status_t SurfaceTexture::setCrop(const Rect& reg) {
140    LOGV("SurfaceTexture::setCrop");
141    Mutex::Autolock lock(mMutex);
142    // XXX: How should we handle crops?
143    return OK;
144}
145
146status_t SurfaceTexture::setTransform(uint32_t transform) {
147    LOGV("SurfaceTexture::setTransform");
148    Mutex::Autolock lock(mMutex);
149    // XXX: How should we handle transforms?
150    return OK;
151}
152
153status_t SurfaceTexture::updateTexImage() {
154    LOGV("SurfaceTexture::updateTexImage");
155    Mutex::Autolock lock(mMutex);
156
157    // We always bind the texture even if we don't update its contents.
158    glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTexName);
159
160    // Initially both mCurrentTexture and mLastQueued are INVALID_BUFFER_SLOT,
161    // so this check will fail until a buffer gets queued.
162    if (mCurrentTexture != mLastQueued) {
163        // XXX: Figure out the right target.
164        mCurrentTexture = mLastQueued;
165        EGLImageKHR image = mSlots[mCurrentTexture].mEglImage;
166        if (image == EGL_NO_IMAGE_KHR) {
167            EGLDisplay dpy = eglGetCurrentDisplay();
168            sp<GraphicBuffer> graphicBuffer = mSlots[mCurrentTexture].mGraphicBuffer;
169            image = createImage(dpy, graphicBuffer);
170            mSlots[mCurrentTexture].mEglImage = image;
171            mSlots[mCurrentTexture].mEglDisplay = dpy;
172        }
173        glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, (GLeglImageOES)image);
174        GLint error = glGetError();
175        if (error != GL_NO_ERROR) {
176            LOGE("error binding external texture image %p (slot %d): %#04x",
177                    image, mCurrentTexture, error);
178            return -EINVAL;
179        }
180    }
181    return OK;
182}
183
184void SurfaceTexture::freeAllBuffers() {
185    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
186        mSlots[i].mGraphicBuffer = 0;
187        mSlots[i].mOwnedByClient = false;
188        if (mSlots[i].mEglImage != EGL_NO_IMAGE_KHR) {
189            eglDestroyImageKHR(mSlots[i].mEglDisplay, mSlots[i].mEglImage);
190            mSlots[i].mEglImage = EGL_NO_IMAGE_KHR;
191            mSlots[i].mEglDisplay = EGL_NO_DISPLAY;
192        }
193    }
194}
195
196EGLImageKHR SurfaceTexture::createImage(EGLDisplay dpy,
197        const sp<GraphicBuffer>& graphicBuffer) {
198    EGLClientBuffer cbuf = (EGLClientBuffer)graphicBuffer->getNativeBuffer();
199    EGLint attrs[] = {
200        EGL_IMAGE_PRESERVED_KHR,    EGL_TRUE,
201        EGL_NONE,
202    };
203    EGLImageKHR image = eglCreateImageKHR(dpy, EGL_NO_CONTEXT,
204            EGL_NATIVE_BUFFER_ANDROID, cbuf, attrs);
205    EGLint error = eglGetError();
206    if (error != EGL_SUCCESS) {
207        LOGE("error creating EGLImage: %#x", error);
208    } else if (image == EGL_NO_IMAGE_KHR) {
209        LOGE("no error reported, but no image was returned by "
210                "eglCreateImageKHR");
211    }
212    return image;
213}
214
215}; // namespace android
216