Marissa Wall | 713b63f | 2018-10-17 15:42:43 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018 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 | #include <gui/BufferItemConsumer.h> |
| 18 | #include <gui/Surface.h> |
| 19 | |
| 20 | #include <GLES3/gl3.h> |
| 21 | #include <math/vec2.h> |
| 22 | #include <math/vec3.h> |
| 23 | #include <math/vec4.h> |
| 24 | |
| 25 | #include "BufferGenerator.h" |
| 26 | #include "BufferGeneratorShader.h" |
| 27 | |
| 28 | namespace android { |
| 29 | |
| 30 | /* Used to receive the surfaces and fences from egl. The egl buffers are thrown |
| 31 | * away. The fences are sent to the requester via a callback */ |
| 32 | class SurfaceManager { |
| 33 | public: |
| 34 | /* Returns a fence from egl */ |
| 35 | using BufferCallback = std::function<void(const sp<GraphicBuffer>& buffer, int32_t fence)>; |
| 36 | |
| 37 | /* Listens for a new frame, detaches the buffer and returns the fence |
| 38 | * through saved callback. */ |
| 39 | class BufferListener : public ConsumerBase::FrameAvailableListener { |
| 40 | public: |
| 41 | BufferListener(sp<IGraphicBufferConsumer> consumer, BufferCallback callback) |
| 42 | : mConsumer(consumer), mCallback(callback) {} |
| 43 | |
| 44 | void onFrameAvailable(const BufferItem& /*item*/) { |
| 45 | BufferItem item; |
| 46 | |
| 47 | if (mConsumer->acquireBuffer(&item, 0)) return; |
| 48 | if (mConsumer->detachBuffer(item.mSlot)) return; |
| 49 | |
| 50 | mCallback(item.mGraphicBuffer, item.mFence->dup()); |
| 51 | } |
| 52 | |
| 53 | private: |
| 54 | sp<IGraphicBufferConsumer> mConsumer; |
| 55 | BufferCallback mCallback; |
| 56 | }; |
| 57 | |
| 58 | /* Creates a buffer listener that waits on a new frame from the buffer |
| 59 | * queue. */ |
| 60 | void initialize(uint32_t width, uint32_t height, android_pixel_format_t format, |
| 61 | BufferCallback callback) { |
| 62 | sp<IGraphicBufferProducer> producer; |
| 63 | sp<IGraphicBufferConsumer> consumer; |
| 64 | BufferQueue::createBufferQueue(&producer, &consumer); |
| 65 | |
| 66 | consumer->setDefaultBufferSize(width, height); |
| 67 | consumer->setDefaultBufferFormat(format); |
| 68 | |
| 69 | mBufferItemConsumer = new BufferItemConsumer(consumer, 0); |
| 70 | |
| 71 | mListener = new BufferListener(consumer, callback); |
| 72 | mBufferItemConsumer->setFrameAvailableListener(mListener); |
| 73 | |
| 74 | mSurface = new Surface(producer, true); |
| 75 | } |
| 76 | |
| 77 | /* Used by Egl manager. The surface is never displayed. */ |
| 78 | sp<Surface> getSurface() const { return mSurface; } |
| 79 | |
| 80 | private: |
| 81 | sp<BufferItemConsumer> mBufferItemConsumer; |
| 82 | sp<BufferListener> mListener; |
| 83 | /* Used by Egl manager. The surface is never displayed */ |
| 84 | sp<Surface> mSurface; |
| 85 | }; |
| 86 | |
| 87 | /* Used to generate valid fences. It is not possible to create a dummy sync |
| 88 | * fence for testing. Egl can generate buffers along with a valid fence. |
| 89 | * The buffer cannot be guaranteed to be the same format across all devices so |
| 90 | * a CPU filled buffer is used instead. The Egl fence is used along with the |
| 91 | * CPU filled buffer. */ |
| 92 | class EglManager { |
| 93 | public: |
| 94 | EglManager() |
| 95 | : mEglDisplay(EGL_NO_DISPLAY), mEglSurface(EGL_NO_SURFACE), mEglContext(EGL_NO_CONTEXT) {} |
| 96 | |
| 97 | ~EglManager() { cleanup(); } |
| 98 | |
| 99 | int initialize(sp<Surface> surface) { |
| 100 | mSurface = surface; |
| 101 | |
| 102 | mEglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY); |
| 103 | if (mEglDisplay == EGL_NO_DISPLAY) return false; |
| 104 | |
| 105 | EGLint major; |
| 106 | EGLint minor; |
| 107 | if (!eglInitialize(mEglDisplay, &major, &minor)) { |
| 108 | ALOGW("Could not initialize EGL"); |
| 109 | return false; |
| 110 | } |
| 111 | |
| 112 | /* We're going to use a 1x1 pbuffer surface later on |
| 113 | * The configuration distance doesn't really matter for what we're |
| 114 | * trying to do */ |
| 115 | EGLint configAttrs[] = {EGL_RENDERABLE_TYPE, |
| 116 | EGL_OPENGL_ES2_BIT, |
| 117 | EGL_RED_SIZE, |
| 118 | 8, |
| 119 | EGL_GREEN_SIZE, |
| 120 | 8, |
| 121 | EGL_BLUE_SIZE, |
| 122 | 8, |
| 123 | EGL_ALPHA_SIZE, |
| 124 | 0, |
| 125 | EGL_DEPTH_SIZE, |
| 126 | 24, |
| 127 | EGL_STENCIL_SIZE, |
| 128 | 0, |
| 129 | EGL_NONE}; |
| 130 | |
| 131 | EGLConfig configs[1]; |
| 132 | EGLint configCnt; |
| 133 | if (!eglChooseConfig(mEglDisplay, configAttrs, configs, 1, &configCnt)) { |
| 134 | ALOGW("Could not select EGL configuration"); |
| 135 | eglReleaseThread(); |
| 136 | eglTerminate(mEglDisplay); |
| 137 | return false; |
| 138 | } |
| 139 | |
| 140 | if (configCnt <= 0) { |
| 141 | ALOGW("Could not find EGL configuration"); |
| 142 | eglReleaseThread(); |
| 143 | eglTerminate(mEglDisplay); |
| 144 | return false; |
| 145 | } |
| 146 | |
| 147 | /* These objects are initialized below but the default "null" values are |
| 148 | * used to cleanup properly at any point in the initialization sequence */ |
| 149 | EGLint attrs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE}; |
| 150 | mEglContext = eglCreateContext(mEglDisplay, configs[0], EGL_NO_CONTEXT, attrs); |
| 151 | if (mEglContext == EGL_NO_CONTEXT) { |
| 152 | ALOGW("Could not create EGL context"); |
| 153 | cleanup(); |
| 154 | return false; |
| 155 | } |
| 156 | |
| 157 | EGLint majorVersion; |
| 158 | if (!eglQueryContext(mEglDisplay, mEglContext, EGL_CONTEXT_CLIENT_VERSION, &majorVersion)) { |
| 159 | ALOGW("Could not query EGL version"); |
| 160 | cleanup(); |
| 161 | return false; |
| 162 | } |
| 163 | |
| 164 | if (majorVersion != 3) { |
| 165 | ALOGW("Unsupported EGL version"); |
| 166 | cleanup(); |
| 167 | return false; |
| 168 | } |
| 169 | |
| 170 | EGLint surfaceAttrs[] = {EGL_NONE}; |
| 171 | mEglSurface = eglCreateWindowSurface(mEglDisplay, configs[0], mSurface.get(), surfaceAttrs); |
| 172 | if (mEglSurface == EGL_NO_SURFACE) { |
| 173 | ALOGW("Could not create EGL surface"); |
| 174 | cleanup(); |
| 175 | return false; |
| 176 | } |
| 177 | |
| 178 | if (!eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext)) { |
| 179 | ALOGW("Could not change current EGL context"); |
| 180 | cleanup(); |
| 181 | return false; |
| 182 | } |
| 183 | |
| 184 | return true; |
| 185 | } |
| 186 | |
| 187 | void makeCurrent() const { eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext); } |
| 188 | |
| 189 | void present() const { eglSwapBuffers(mEglDisplay, mEglSurface); } |
| 190 | |
| 191 | private: |
| 192 | void cleanup() { |
| 193 | if (mEglDisplay == EGL_NO_DISPLAY) return; |
| 194 | if (mEglSurface != EGL_NO_SURFACE) eglDestroySurface(mEglDisplay, mEglSurface); |
| 195 | if (mEglContext != EGL_NO_CONTEXT) eglDestroyContext(mEglDisplay, mEglContext); |
| 196 | |
| 197 | eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); |
| 198 | eglReleaseThread(); |
| 199 | eglTerminate(mEglDisplay); |
| 200 | } |
| 201 | |
| 202 | sp<Surface> mSurface; |
| 203 | EGLDisplay mEglDisplay; |
| 204 | EGLSurface mEglSurface; |
| 205 | EGLContext mEglContext; |
| 206 | }; |
| 207 | |
| 208 | class Program { |
| 209 | public: |
| 210 | ~Program() { |
| 211 | if (mInitialized) { |
| 212 | glDetachShader(mProgram, mVertexShader); |
| 213 | glDetachShader(mProgram, mFragmentShader); |
| 214 | |
| 215 | glDeleteShader(mVertexShader); |
| 216 | glDeleteShader(mFragmentShader); |
| 217 | |
| 218 | glDeleteProgram(mProgram); |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | bool initialize(const char* vertex, const char* fragment) { |
| 223 | mVertexShader = buildShader(vertex, GL_VERTEX_SHADER); |
| 224 | if (!mVertexShader) { |
| 225 | return false; |
| 226 | } |
| 227 | |
| 228 | mFragmentShader = buildShader(fragment, GL_FRAGMENT_SHADER); |
| 229 | if (!mFragmentShader) { |
| 230 | return false; |
| 231 | } |
| 232 | |
| 233 | mProgram = glCreateProgram(); |
| 234 | glAttachShader(mProgram, mVertexShader); |
| 235 | glAttachShader(mProgram, mFragmentShader); |
| 236 | |
| 237 | glLinkProgram(mProgram); |
| 238 | |
| 239 | GLint status; |
| 240 | glGetProgramiv(mProgram, GL_LINK_STATUS, &status); |
| 241 | if (status != GL_TRUE) { |
| 242 | GLint length = 0; |
| 243 | glGetProgramiv(mProgram, GL_INFO_LOG_LENGTH, &length); |
| 244 | if (length > 1) { |
| 245 | GLchar log[length]; |
| 246 | glGetProgramInfoLog(mProgram, length, nullptr, &log[0]); |
| 247 | ALOGE("%s", log); |
| 248 | } |
| 249 | ALOGE("Error while linking shaders"); |
| 250 | return false; |
| 251 | } |
| 252 | mInitialized = true; |
| 253 | return true; |
| 254 | } |
| 255 | |
| 256 | void use() const { glUseProgram(mProgram); } |
| 257 | |
| 258 | void bindVec4(GLint location, vec4 v) const { glUniform4f(location, v.x, v.y, v.z, v.w); } |
| 259 | |
| 260 | void bindVec3(GLint location, const vec3* v, uint32_t count) const { |
| 261 | glUniform3fv(location, count, &(v->x)); |
| 262 | } |
| 263 | |
| 264 | void bindFloat(GLint location, float v) { glUniform1f(location, v); } |
| 265 | |
| 266 | private: |
| 267 | GLuint buildShader(const char* source, GLenum type) const { |
| 268 | GLuint shader = glCreateShader(type); |
| 269 | glShaderSource(shader, 1, &source, nullptr); |
| 270 | glCompileShader(shader); |
| 271 | |
| 272 | GLint status; |
| 273 | glGetShaderiv(shader, GL_COMPILE_STATUS, &status); |
| 274 | if (status != GL_TRUE) { |
| 275 | ALOGE("Error while compiling shader of type 0x%x:\n===\n%s\n===", type, source); |
| 276 | // Some drivers return wrong values for GL_INFO_LOG_LENGTH |
| 277 | // use a fixed size instead |
| 278 | GLchar log[512]; |
| 279 | glGetShaderInfoLog(shader, sizeof(log), nullptr, &log[0]); |
| 280 | ALOGE("Shader info log: %s", log); |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | return shader; |
| 285 | } |
| 286 | |
| 287 | GLuint mProgram = 0; |
| 288 | GLuint mVertexShader = 0; |
| 289 | GLuint mFragmentShader = 0; |
| 290 | bool mInitialized = false; |
| 291 | }; |
| 292 | |
| 293 | BufferGenerator::BufferGenerator() |
| 294 | : mSurfaceManager(new SurfaceManager), mEglManager(new EglManager), mProgram(new Program) { |
| 295 | const float width = 1000.0; |
| 296 | const float height = 1000.0; |
| 297 | |
| 298 | auto setBufferWithContext = |
| 299 | std::bind(setBuffer, std::placeholders::_1, std::placeholders::_2, this); |
| 300 | mSurfaceManager->initialize(width, height, HAL_PIXEL_FORMAT_RGBA_8888, setBufferWithContext); |
| 301 | |
| 302 | if (!mEglManager->initialize(mSurfaceManager->getSurface())) return; |
| 303 | |
| 304 | mEglManager->makeCurrent(); |
| 305 | |
| 306 | if (!mProgram->initialize(VERTEX_SHADER, FRAGMENT_SHADER)) return; |
| 307 | mProgram->use(); |
| 308 | mProgram->bindVec4(0, vec4{width, height, 1.0f / width, 1.0f / height}); |
| 309 | mProgram->bindVec3(2, &SPHERICAL_HARMONICS[0], 4); |
| 310 | |
| 311 | glEnableVertexAttribArray(0); |
| 312 | glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, &TRIANGLE[0]); |
| 313 | |
| 314 | mInitialized = true; |
| 315 | } |
| 316 | |
| 317 | BufferGenerator::~BufferGenerator() { |
| 318 | mEglManager->makeCurrent(); |
| 319 | } |
| 320 | |
| 321 | status_t BufferGenerator::get(sp<GraphicBuffer>* outBuffer, sp<Fence>* outFence) { |
| 322 | // mMutex is used to protect get() from getting called by multiple threads at the same time |
| 323 | static std::mutex mMutex; |
| 324 | std::lock_guard lock(mMutex); |
| 325 | |
| 326 | if (!mInitialized) { |
| 327 | if (outBuffer) { |
| 328 | *outBuffer = nullptr; |
| 329 | } |
| 330 | if (*outFence) { |
| 331 | *outFence = nullptr; |
| 332 | } |
| 333 | return -EINVAL; |
| 334 | } |
| 335 | |
| 336 | // Generate a buffer and fence. They will be returned through the setBuffer callback |
| 337 | mEglManager->makeCurrent(); |
| 338 | |
| 339 | glClear(GL_COLOR_BUFFER_BIT); |
| 340 | |
| 341 | const std::chrono::duration<float> time = std::chrono::steady_clock::now() - mEpoch; |
| 342 | mProgram->bindFloat(1, time.count()); |
| 343 | |
| 344 | glDrawArrays(GL_TRIANGLES, 0, 3); |
| 345 | |
| 346 | mPending = true; |
| 347 | mEglManager->present(); |
| 348 | |
| 349 | // Wait for the setBuffer callback |
| 350 | if (!mConditionVariable.wait_for(mMutex, std::chrono::seconds(2), |
| 351 | [this] { return !mPending; })) { |
| 352 | ALOGE("failed to set buffer and fence"); |
| 353 | return -ETIME; |
| 354 | } |
| 355 | |
| 356 | // Return buffer and fence |
| 357 | if (outBuffer) { |
| 358 | *outBuffer = mGraphicBuffer; |
| 359 | } |
| 360 | if (outFence) { |
| 361 | *outFence = new Fence(mFence); |
| 362 | } else { |
| 363 | close(mFence); |
| 364 | } |
| 365 | mGraphicBuffer = nullptr; |
| 366 | mFence = -1; |
| 367 | |
| 368 | return NO_ERROR; |
| 369 | } |
| 370 | |
| 371 | // static |
| 372 | void BufferGenerator::setBuffer(const sp<GraphicBuffer>& buffer, int32_t fence, |
| 373 | void* bufferGenerator) { |
| 374 | BufferGenerator* generator = static_cast<BufferGenerator*>(bufferGenerator); |
| 375 | generator->mGraphicBuffer = buffer; |
| 376 | generator->mFence = fence; |
| 377 | generator->mPending = false; |
| 378 | generator->mConditionVariable.notify_all(); |
| 379 | } |
| 380 | |
| 381 | } // namespace android |