EglManager.cpp revision 1d4774233304c484673e2af2c1de2ab41021c979 
1/*
2 * Copyright (C) 2014 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 "EglContext"
18
19#include "EglManager.h"
20
21#include <cutils/log.h>
22#include <cutils/properties.h>
23
24#include "../RenderState.h"
25#include "RenderThread.h"
26
27#define PROPERTY_RENDER_DIRTY_REGIONS "debug.hwui.render_dirty_regions"
28#define GLES_VERSION 2
29
30// Android-specific addition that is used to show when frames began in systrace
31EGLAPI void EGLAPIENTRY eglBeginFrame(EGLDisplay dpy, EGLSurface surface);
32
33namespace android {
34namespace uirenderer {
35namespace renderthread {
36
37#define ERROR_CASE(x) case x: return #x;
38static const char* egl_error_str(EGLint error) {
39    switch (error) {
40        ERROR_CASE(EGL_SUCCESS)
41        ERROR_CASE(EGL_NOT_INITIALIZED)
42        ERROR_CASE(EGL_BAD_ACCESS)
43        ERROR_CASE(EGL_BAD_ALLOC)
44        ERROR_CASE(EGL_BAD_ATTRIBUTE)
45        ERROR_CASE(EGL_BAD_CONFIG)
46        ERROR_CASE(EGL_BAD_CONTEXT)
47        ERROR_CASE(EGL_BAD_CURRENT_SURFACE)
48        ERROR_CASE(EGL_BAD_DISPLAY)
49        ERROR_CASE(EGL_BAD_MATCH)
50        ERROR_CASE(EGL_BAD_NATIVE_PIXMAP)
51        ERROR_CASE(EGL_BAD_NATIVE_WINDOW)
52        ERROR_CASE(EGL_BAD_PARAMETER)
53        ERROR_CASE(EGL_BAD_SURFACE)
54        ERROR_CASE(EGL_CONTEXT_LOST)
55    default:
56        return "Unknown error";
57    }
58}
59static const char* egl_error_str() {
60    return egl_error_str(eglGetError());
61}
62
63static bool load_dirty_regions_property() {
64    char buf[PROPERTY_VALUE_MAX];
65    int len = property_get(PROPERTY_RENDER_DIRTY_REGIONS, buf, "true");
66    return !strncasecmp("true", buf, len);
67}
68
69EglManager::EglManager(RenderThread& thread)
70        : mRenderThread(thread)
71        , mEglDisplay(EGL_NO_DISPLAY)
72        , mEglConfig(0)
73        , mEglContext(EGL_NO_CONTEXT)
74        , mPBufferSurface(EGL_NO_SURFACE)
75        , mRequestDirtyRegions(load_dirty_regions_property())
76        , mCurrentSurface(EGL_NO_SURFACE)
77        , mAtlasMap(NULL)
78        , mAtlasMapSize(0) {
79    mCanSetDirtyRegions = mRequestDirtyRegions;
80    ALOGD("Render dirty regions requested: %s", mRequestDirtyRegions ? "true" : "false");
81}
82
83void EglManager::initialize() {
84    if (hasEglContext()) return;
85
86    mEglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
87    LOG_ALWAYS_FATAL_IF(mEglDisplay == EGL_NO_DISPLAY,
88            "Failed to get EGL_DEFAULT_DISPLAY! err=%s", egl_error_str());
89
90    EGLint major, minor;
91    LOG_ALWAYS_FATAL_IF(eglInitialize(mEglDisplay, &major, &minor) == EGL_FALSE,
92            "Failed to initialize display %p! err=%s", mEglDisplay, egl_error_str());
93
94    ALOGI("Initialized EGL, version %d.%d", (int)major, (int)minor);
95
96    loadConfig();
97    createContext();
98    usePBufferSurface();
99    mRenderThread.renderState().onGLContextCreated();
100    initAtlas();
101}
102
103bool EglManager::hasEglContext() {
104    return mEglDisplay != EGL_NO_DISPLAY;
105}
106
107void EglManager::requireGlContext() {
108    LOG_ALWAYS_FATAL_IF(mEglDisplay == EGL_NO_DISPLAY, "No EGL context");
109
110    // We don't care *WHAT* surface is active, just that one is active to give
111    // us access to the GL context
112    if (mCurrentSurface == EGL_NO_SURFACE) {
113        usePBufferSurface();
114    }
115}
116
117void EglManager::loadConfig() {
118    EGLint swapBehavior = mCanSetDirtyRegions ? EGL_SWAP_BEHAVIOR_PRESERVED_BIT : 0;
119    EGLint attribs[] = {
120            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
121            EGL_RED_SIZE, 8,
122            EGL_GREEN_SIZE, 8,
123            EGL_BLUE_SIZE, 8,
124            EGL_ALPHA_SIZE, 8,
125            EGL_DEPTH_SIZE, 0,
126            EGL_CONFIG_CAVEAT, EGL_NONE,
127            EGL_STENCIL_SIZE, Stencil::getStencilSize(),
128            EGL_SURFACE_TYPE, EGL_WINDOW_BIT | swapBehavior,
129            EGL_NONE
130    };
131
132    EGLint num_configs = 1;
133    if (!eglChooseConfig(mEglDisplay, attribs, &mEglConfig, num_configs, &num_configs)
134            || num_configs != 1) {
135        // Failed to get a valid config
136        if (mCanSetDirtyRegions) {
137            ALOGW("Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...");
138            // Try again without dirty regions enabled
139            mCanSetDirtyRegions = false;
140            loadConfig();
141        } else {
142            LOG_ALWAYS_FATAL("Failed to choose config, error = %s", egl_error_str());
143        }
144    }
145}
146
147void EglManager::createContext() {
148    EGLint attribs[] = { EGL_CONTEXT_CLIENT_VERSION, GLES_VERSION, EGL_NONE };
149    mEglContext = eglCreateContext(mEglDisplay, mEglConfig, EGL_NO_CONTEXT, attribs);
150    LOG_ALWAYS_FATAL_IF(mEglContext == EGL_NO_CONTEXT,
151        "Failed to create context, error = %s", egl_error_str());
152}
153
154void EglManager::setTextureAtlas(const sp<GraphicBuffer>& buffer,
155        int64_t* map, size_t mapSize) {
156
157    // Already initialized
158    if (mAtlasBuffer.get()) {
159        ALOGW("Multiple calls to setTextureAtlas!");
160        delete map;
161        return;
162    }
163
164    mAtlasBuffer = buffer;
165    mAtlasMap = map;
166    mAtlasMapSize = mapSize;
167
168    if (hasEglContext()) {
169        usePBufferSurface();
170        initAtlas();
171    }
172}
173
174void EglManager::initAtlas() {
175    if (mAtlasBuffer.get()) {
176        Caches::getInstance().assetAtlas.init(mAtlasBuffer, mAtlasMap, mAtlasMapSize);
177    }
178}
179
180void EglManager::usePBufferSurface() {
181    LOG_ALWAYS_FATAL_IF(mEglDisplay == EGL_NO_DISPLAY,
182            "usePBufferSurface() called on uninitialized GlobalContext!");
183
184    if (mPBufferSurface == EGL_NO_SURFACE) {
185        EGLint attribs[] = { EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE };
186        mPBufferSurface = eglCreatePbufferSurface(mEglDisplay, mEglConfig, attribs);
187    }
188    makeCurrent(mPBufferSurface);
189}
190
191EGLSurface EglManager::createSurface(EGLNativeWindowType window) {
192    initialize();
193    EGLSurface surface = eglCreateWindowSurface(mEglDisplay, mEglConfig, window, NULL);
194    LOG_ALWAYS_FATAL_IF(surface == EGL_NO_SURFACE,
195            "Failed to create EGLSurface for window %p, eglErr = %s",
196            (void*) window, egl_error_str());
197    return surface;
198}
199
200void EglManager::destroySurface(EGLSurface surface) {
201    if (isCurrent(surface)) {
202        makeCurrent(EGL_NO_SURFACE);
203    }
204    if (!eglDestroySurface(mEglDisplay, surface)) {
205        ALOGW("Failed to destroy surface %p, error=%s", (void*)surface, egl_error_str());
206    }
207}
208
209void EglManager::destroy() {
210    if (mEglDisplay == EGL_NO_DISPLAY) return;
211
212    usePBufferSurface();
213    if (Caches::hasInstance()) {
214        Caches::getInstance().terminate();
215    }
216
217    mRenderThread.renderState().onGLContextDestroyed();
218    eglDestroyContext(mEglDisplay, mEglContext);
219    eglDestroySurface(mEglDisplay, mPBufferSurface);
220    eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
221    eglTerminate(mEglDisplay);
222    eglReleaseThread();
223
224    mEglDisplay = EGL_NO_DISPLAY;
225    mEglContext = EGL_NO_CONTEXT;
226    mPBufferSurface = EGL_NO_SURFACE;
227    mCurrentSurface = EGL_NO_SURFACE;
228}
229
230bool EglManager::makeCurrent(EGLSurface surface) {
231    if (isCurrent(surface)) return false;
232
233    if (surface == EGL_NO_SURFACE) {
234        // If we are setting EGL_NO_SURFACE we don't care about any of the potential
235        // return errors, which would only happen if mEglDisplay had already been
236        // destroyed in which case the current context is already NO_CONTEXT
237        eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
238    } else if (!eglMakeCurrent(mEglDisplay, surface, surface, mEglContext)) {
239        LOG_ALWAYS_FATAL("Failed to make current on surface %p, error=%s",
240                (void*)surface, egl_error_str());
241    }
242    mCurrentSurface = surface;
243    return true;
244}
245
246void EglManager::beginFrame(EGLSurface surface, EGLint* width, EGLint* height) {
247    LOG_ALWAYS_FATAL_IF(surface == EGL_NO_SURFACE,
248            "Tried to beginFrame on EGL_NO_SURFACE!");
249    makeCurrent(surface);
250    if (width) {
251        eglQuerySurface(mEglDisplay, surface, EGL_WIDTH, width);
252    }
253    if (height) {
254        eglQuerySurface(mEglDisplay, surface, EGL_HEIGHT, height);
255    }
256    eglBeginFrame(mEglDisplay, surface);
257}
258
259void EglManager::swapBuffers(EGLSurface surface) {
260    eglSwapBuffers(mEglDisplay, surface);
261    EGLint err = eglGetError();
262    LOG_ALWAYS_FATAL_IF(err != EGL_SUCCESS,
263            "Encountered EGL error %d %s during rendering", err, egl_error_str(err));
264}
265
266bool EglManager::enableDirtyRegions(EGLSurface surface) {
267    if (!mRequestDirtyRegions) return false;
268
269    if (mCanSetDirtyRegions) {
270        if (!eglSurfaceAttrib(mEglDisplay, surface, EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED)) {
271            ALOGW("Failed to set EGL_SWAP_BEHAVIOR on surface %p, error=%s",
272                    (void*) surface, egl_error_str());
273            return false;
274        }
275        return true;
276    }
277    // Perhaps it is already enabled?
278    EGLint value;
279    if (!eglQuerySurface(mEglDisplay, surface, EGL_SWAP_BEHAVIOR, &value)) {
280        ALOGW("Failed to query EGL_SWAP_BEHAVIOR on surface %p, error=%p",
281                (void*) surface, egl_error_str());
282        return false;
283    }
284    return value == EGL_BUFFER_PRESERVED;
285}
286
287} /* namespace renderthread */
288} /* namespace uirenderer */
289} /* namespace android */
290