glworker.cpp

   1 /*
   2  * Copyright (C) 2015 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 ATRACE_TAG ATRACE_TAG_GRAPHICS
  18 #define LOG_TAG "hwc-gl-worker"
  19
  20 #include <algorithm>
  21 #include <string>
  22 #include <sstream>
  23
  24 #include <sys/resource.h>
  25
  26 #include <cutils/properties.h>
  27
  28 #include <hardware/hardware.h>
  29 #include <hardware/hwcomposer.h>
  30
  31 #include <ui/GraphicBuffer.h>
  32 #include <ui/PixelFormat.h>
  33
  34 #include <utils/Trace.h>
  35
  36 #include "glworker.h"
  37
  38 #include "seperate_rects.h"
  39
  40 // TODO(zachr): use hwc_drm_bo to turn buffer handles into textures
  41 #ifndef EGL_NATIVE_HANDLE_ANDROID_NVX
  42 #define EGL_NATIVE_HANDLE_ANDROID_NVX 0x322A
  43 #endif
  44
  45 #define MAX_OVERLAPPING_LAYERS 64
  46
  47 namespace android {
  48
  49 typedef seperate_rects::Rect<float> FRect;
  50 typedef seperate_rects::RectSet<uint64_t, float> FRectSet;
  51
  52 // clang-format off
  53 // Column-major order:
  54 // float mat[4] = { 1, 2, 3, 4 } ===
  55 // [ 1 3 ]
  56 // [ 2 4 ]
  57 float kTextureTransformMatrices[] = {
  58    1.0f,  0.0f,  0.0f,  1.0f, // identity matrix
  59    0.0f,  1.0f,  1.0f,  0.0f, // swap x and y
  60 };
  61 // clang-format on
  62
  63 static const char *GetGLError(void) {
  64   switch (glGetError()) {
  65     case GL_NO_ERROR:
  66       return "GL_NO_ERROR";
  67     case GL_INVALID_ENUM:
  68       return "GL_INVALID_ENUM";
  69     case GL_INVALID_VALUE:
  70       return "GL_INVALID_VALUE";
  71     case GL_INVALID_OPERATION:
  72       return "GL_INVALID_OPERATION";
  73     case GL_INVALID_FRAMEBUFFER_OPERATION:
  74       return "GL_INVALID_FRAMEBUFFER_OPERATION";
  75     case GL_OUT_OF_MEMORY:
  76       return "GL_OUT_OF_MEMORY";
  77     default:
  78       return "Unknown error";
  79   }
  80 }
  81
  82 static const char *GetGLFramebufferError(void) {
  83   switch (glCheckFramebufferStatus(GL_FRAMEBUFFER)) {
  84     case GL_FRAMEBUFFER_COMPLETE:
  85       return "GL_FRAMEBUFFER_COMPLETE";
  86     case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
  87       return "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT";
  88     case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
  89       return "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT";
  90     case GL_FRAMEBUFFER_UNSUPPORTED:
  91       return "GL_FRAMEBUFFER_UNSUPPORTED";
  92     case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
  93       return "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS";
  94     default:
  95       return "Unknown error";
  96   }
  97 }
  98
  99 static const char *GetEGLError(void) {
 100   switch (eglGetError()) {
 101     case EGL_SUCCESS:
 102       return "EGL_SUCCESS";
 103     case EGL_NOT_INITIALIZED:
 104       return "EGL_NOT_INITIALIZED";
 105     case EGL_BAD_ACCESS:
 106       return "EGL_BAD_ACCESS";
 107     case EGL_BAD_ALLOC:
 108       return "EGL_BAD_ALLOC";
 109     case EGL_BAD_ATTRIBUTE:
 110       return "EGL_BAD_ATTRIBUTE";
 111     case EGL_BAD_CONTEXT:
 112       return "EGL_BAD_CONTEXT";
 113     case EGL_BAD_CONFIG:
 114       return "EGL_BAD_CONFIG";
 115     case EGL_BAD_CURRENT_SURFACE:
 116       return "EGL_BAD_CURRENT_SURFACE";
 117     case EGL_BAD_DISPLAY:
 118       return "EGL_BAD_DISPLAY";
 119     case EGL_BAD_SURFACE:
 120       return "EGL_BAD_SURFACE";
 121     case EGL_BAD_MATCH:
 122       return "EGL_BAD_MATCH";
 123     case EGL_BAD_PARAMETER:
 124       return "EGL_BAD_PARAMETER";
 125     case EGL_BAD_NATIVE_PIXMAP:
 126       return "EGL_BAD_NATIVE_PIXMAP";
 127     case EGL_BAD_NATIVE_WINDOW:
 128       return "EGL_BAD_NATIVE_WINDOW";
 129     case EGL_CONTEXT_LOST:
 130       return "EGL_CONTEXT_LOST";
 131     default:
 132       return "Unknown error";
 133   }
 134 }
 135
 136 static bool HasExtension(const char *extension, const char *extensions) {
 137   const char *start, *where, *terminator;
 138   start = extensions;
 139   for (;;) {
 140     where = (char *)strstr((const char *)start, extension);
 141     if (!where)
 142       break;
 143     terminator = where + strlen(extension);
 144     if (where == start || *(where - 1) == ' ')
 145       if (*terminator == ' ' || *terminator == '\0')
 146         return true;
 147     start = terminator;
 148   }
 149   return false;
 150 }
 151
 152 static AutoGLShader CompileAndCheckShader(GLenum type, unsigned source_count,
 153                                           const GLchar **sources,
 154                                           std::string *shader_log) {
 155   GLint status;
 156   AutoGLShader shader(glCreateShader(type));
 157   if (shader.get() == 0) {
 158     *shader_log = "glCreateShader failed";
 159     return 0;
 160   }
 161   glShaderSource(shader.get(), source_count, sources, NULL);
 162   glCompileShader(shader.get());
 163   glGetShaderiv(shader.get(), GL_COMPILE_STATUS, &status);
 164   if (!status) {
 165     if (shader_log) {
 166       GLint log_length;
 167       glGetShaderiv(shader.get(), GL_INFO_LOG_LENGTH, &log_length);
 168       shader_log->resize(log_length);
 169       glGetShaderInfoLog(shader.get(), log_length, NULL, &(*shader_log)[0]);
 170     }
 171     return 0;
 172   }
 173
 174   return shader;
 175 }
 176
 177 static int GenerateShaders(std::vector<AutoGLProgram> *blend_programs) {
 178   // Limits: GL_MAX_VARYING_COMPONENTS, GL_MAX_TEXTURE_IMAGE_UNITS,
 179   // GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
 180   // clang-format off
 181   const GLchar *shader_preamble = "#version 300 es\n#define LAYER_COUNT ";
 182
 183   const GLchar *vertex_shader_source =
 184 "\n"
 185 "precision mediump int;                                                     \n"
 186 "uniform vec4 uViewport;                                                    \n"
 187 "uniform sampler2D uLayerTextures[LAYER_COUNT];                             \n"
 188 "uniform vec4 uLayerCrop[LAYER_COUNT];                                      \n"
 189 "uniform mat2 uTexMatrix[LAYER_COUNT];                                      \n"
 190 "in vec2 vPosition;                                                         \n"
 191 "in vec2 vTexCoords;                                                        \n"
 192 "out vec2 fTexCoords[LAYER_COUNT];                                          \n"
 193 "void main() {                                                              \n"
 194 "  for (int i = 0; i < LAYER_COUNT; i++) {                                  \n"
 195 "    vec2 tempCoords = vTexCoords * uTexMatrix[i];                          \n"
 196 "    fTexCoords[i] = (uLayerCrop[i].xy + tempCoords * uLayerCrop[i].zw) /   \n"
 197 "                     vec2(textureSize(uLayerTextures[i], 0));              \n"
 198 "  }                                                                        \n"
 199 "  vec2 scaledPosition = uViewport.xy + vPosition * uViewport.zw;           \n"
 200 "  gl_Position = vec4(scaledPosition * vec2(2.0) - vec2(1.0), 0.0, 1.0);    \n"
 201 "}                                                                          \n";
 202
 203   const GLchar *fragment_shader_source =
 204 "\n"
 205 "precision mediump float;                                                   \n"
 206 "uniform sampler2D uLayerTextures[LAYER_COUNT];                             \n"
 207 "uniform float uLayerAlpha[LAYER_COUNT];                                    \n"
 208 "in vec2 fTexCoords[LAYER_COUNT];                                           \n"
 209 "out vec4 oFragColor;                                                       \n"
 210 "void main() {                                                              \n"
 211 "  vec3 color = vec3(0.0, 0.0, 0.0);                                        \n"
 212 "  float alphaCover = 1.0;                                                  \n"
 213 "  for (int i = 0; i < LAYER_COUNT; i++) {                                  \n"
 214 "    vec4 texSample = texture(uLayerTextures[i], fTexCoords[i]);            \n"
 215 "    float a = texSample.a * uLayerAlpha[i];                                \n"
 216 "    color += a * alphaCover * texSample.rgb;                               \n"
 217 "    alphaCover *= 1.0 - a;                                                 \n"
 218 "    if (alphaCover <= 0.5/255.0)                                           \n"
 219 "      break;                                                               \n"
 220 "  }                                                                        \n"
 221 "  oFragColor = vec4(color, 1.0 - alphaCover);                              \n"
 222 "}                                                                          \n";
 223   // clang-format on
 224
 225   int i, ret = 1;
 226   GLint max_texture_images, status;
 227   AutoGLShader vertex_shader, fragment_shader;
 228   AutoGLProgram program;
 229   std::string shader_log;
 230
 231   glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &max_texture_images);
 232
 233   for (i = 1; i <= max_texture_images; i++) {
 234     std::ostringstream layer_count_formatter;
 235     layer_count_formatter << i;
 236     std::string layer_count(layer_count_formatter.str());
 237     const GLchar *shader_sources[3] = {shader_preamble, layer_count.c_str(),
 238                                        NULL};
 239
 240     shader_sources[2] = vertex_shader_source;
 241     vertex_shader = CompileAndCheckShader(GL_VERTEX_SHADER, 3, shader_sources,
 242                                           ret ? &shader_log : NULL);
 243     if (!vertex_shader.get()) {
 244       if (ret)
 245         ALOGE("Failed to make vertex shader:\n%s", shader_log.c_str());
 246       break;
 247     }
 248
 249     shader_sources[2] = fragment_shader_source;
 250     fragment_shader = CompileAndCheckShader(
 251         GL_FRAGMENT_SHADER, 3, shader_sources, ret ? &shader_log : NULL);
 252     if (!fragment_shader.get()) {
 253       if (ret)
 254         ALOGE("Failed to make fragment shader:\n%s", shader_log.c_str());
 255       break;
 256     }
 257
 258     program = AutoGLProgram(glCreateProgram());
 259     if (!program.get()) {
 260       if (ret)
 261         ALOGE("Failed to create program %s", GetGLError());
 262       break;
 263     }
 264
 265     glAttachShader(program.get(), vertex_shader.get());
 266     glAttachShader(program.get(), fragment_shader.get());
 267     glBindAttribLocation(program.get(), 0, "vPosition");
 268     glBindAttribLocation(program.get(), 1, "vTexCoords");
 269     glLinkProgram(program.get());
 270     glDetachShader(program.get(), vertex_shader.get());
 271     glDetachShader(program.get(), fragment_shader.get());
 272
 273     glGetProgramiv(program.get(), GL_LINK_STATUS, &status);
 274     if (!status) {
 275       if (ret) {
 276         GLint log_length;
 277         glGetProgramiv(program.get(), GL_INFO_LOG_LENGTH, &log_length);
 278         std::string program_log(log_length, ' ');
 279         glGetProgramInfoLog(program.get(), log_length, NULL, &program_log[0]);
 280         ALOGE("Failed to link program: \n%s", program_log.c_str());
 281       }
 282       break;
 283     }
 284
 285     ret = 0;
 286     blend_programs->emplace_back(std::move(program));
 287   }
 288
 289   return ret;
 290 }
 291
 292 struct RenderingCommand {
 293   struct TextureSource {
 294     unsigned texture_index;
 295     float crop_bounds[4];
 296     float alpha;
 297     float texture_matrix[4];
 298   };
 299
 300   float bounds[4];
 301   unsigned texture_count;
 302   TextureSource textures[MAX_OVERLAPPING_LAYERS];
 303
 304   RenderingCommand() : texture_count(0) {
 305   }
 306 };
 307
 308 static void ConstructCommands(const hwc_layer_1 *layers, size_t num_layers,
 309                               std::vector<RenderingCommand> *commands) {
 310   std::vector<FRect> in_rects;
 311   std::vector<FRectSet> out_rects;
 312   int i;
 313
 314   for (unsigned rect_index = 0; rect_index < num_layers; rect_index++) {
 315     const hwc_layer_1 &layer = layers[rect_index];
 316     FRect rect;
 317     in_rects.push_back(FRect(layer.displayFrame.left, layer.displayFrame.top,
 318                              layer.displayFrame.right,
 319                              layer.displayFrame.bottom));
 320   }
 321
 322   seperate_frects_64(in_rects, &out_rects);
 323
 324   for (unsigned rect_index = 0; rect_index < out_rects.size(); rect_index++) {
 325     const FRectSet &out_rect = out_rects[rect_index];
 326     commands->push_back(RenderingCommand());
 327     RenderingCommand &cmd = commands->back();
 328
 329     memcpy(cmd.bounds, out_rect.rect.bounds, sizeof(cmd.bounds));
 330
 331     uint64_t tex_set = out_rect.id_set.getBits();
 332     for (unsigned i = num_layers - 1; tex_set != 0x0; i--) {
 333       if (tex_set & (0x1 << i)) {
 334         tex_set &= ~(0x1 << i);
 335
 336         const hwc_layer_1 &layer = layers[i];
 337
 338         FRect display_rect(layer.displayFrame.left, layer.displayFrame.top,
 339                            layer.displayFrame.right, layer.displayFrame.bottom);
 340         float display_size[2] = {
 341             display_rect.bounds[2] - display_rect.bounds[0],
 342             display_rect.bounds[3] - display_rect.bounds[1]};
 343
 344         FRect crop_rect(layer.sourceCropf.left, layer.sourceCropf.top,
 345                         layer.sourceCropf.right, layer.sourceCropf.bottom);
 346         float crop_size[2] = {crop_rect.bounds[2] - crop_rect.bounds[0],
 347                               crop_rect.bounds[3] - crop_rect.bounds[1]};
 348
 349         RenderingCommand::TextureSource &src = cmd.textures[cmd.texture_count];
 350         cmd.texture_count++;
 351         src.texture_index = i;
 352
 353         bool swap_xy, flip_xy[2];
 354         switch (layer.transform) {
 355           case HWC_TRANSFORM_FLIP_H:
 356             swap_xy = false; flip_xy[0] = true; flip_xy[1] = false;
 357             break;
 358           case HWC_TRANSFORM_FLIP_V:
 359             swap_xy = false; flip_xy[0] = false; flip_xy[1] = true;
 360             break;
 361           case HWC_TRANSFORM_ROT_90:
 362             swap_xy = true; flip_xy[0] = false; flip_xy[1] = true;
 363             break;
 364           case HWC_TRANSFORM_ROT_180:
 365             swap_xy = false; flip_xy[0] = true; flip_xy[1] = true;
 366             break;
 367           case HWC_TRANSFORM_ROT_270:
 368             swap_xy = true; flip_xy[0] = true; flip_xy[1] = false;
 369             break;
 370           default:
 371             ALOGE(
 372                 "Unknown transform for layer: defaulting to identity "
 373                 "transform");
 374           case 0:
 375             swap_xy = false; flip_xy[0] = false; flip_xy[1] = false;
 376             break;
 377         }
 378
 379         if (swap_xy)
 380           std::copy_n(&kTextureTransformMatrices[4], 4, src.texture_matrix);
 381         else
 382           std::copy_n(&kTextureTransformMatrices[0], 4, src.texture_matrix);
 383
 384         for (int j = 0; j < 4; j++) {
 385           int b = j ^ (swap_xy ? 1 : 0);
 386           float bound_percent = (cmd.bounds[b] - display_rect.bounds[b % 2]) /
 387                                 display_size[b % 2];
 388           if (flip_xy[j % 2]) {
 389             src.crop_bounds[j] =
 390                 crop_rect.bounds[j % 2 + 2] - bound_percent * crop_size[j % 2];
 391           } else {
 392             src.crop_bounds[j] =
 393                 crop_rect.bounds[j % 2] + bound_percent * crop_size[j % 2];
 394           }
 395         }
 396
 397         if (layer.blending == HWC_BLENDING_NONE) {
 398           src.alpha = 1.0f;
 399           // This layer is opaque. There is no point in using layers below this
 400           // one.
 401           break;
 402         }
 403
 404         src.alpha = layer.planeAlpha / 255.0f;
 405       }
 406     }
 407   }
 408 }
 409
 410 static int EGLFenceWait(EGLDisplay egl_display, int acquireFenceFd) {
 411   int ret = 0;
 412
 413   EGLint attribs[] = {EGL_SYNC_NATIVE_FENCE_FD_ANDROID, acquireFenceFd,
 414                       EGL_NONE};
 415   EGLSyncKHR egl_sync =
 416       eglCreateSyncKHR(egl_display, EGL_SYNC_NATIVE_FENCE_ANDROID, attribs);
 417   if (egl_sync == EGL_NO_SYNC_KHR) {
 418     ALOGE("Failed to make EGLSyncKHR from acquireFenceFd: %s", GetEGLError());
 419     close(acquireFenceFd);
 420     return 1;
 421   }
 422
 423   EGLint success = eglWaitSyncKHR(egl_display, egl_sync, 0);
 424   if (success == EGL_FALSE) {
 425     ALOGE("Failed to wait for acquire: %s", GetEGLError());
 426     ret = 1;
 427   }
 428   eglDestroySyncKHR(egl_display, egl_sync);
 429
 430   return ret;
 431 }
 432
 433 static int CreateTextureFromHandle(EGLDisplay egl_display,
 434                                    buffer_handle_t handle,
 435                                    AutoEGLImageAndGLTexture *out) {
 436   EGLImageKHR image = eglCreateImageKHR(
 437       egl_display, EGL_NO_CONTEXT, EGL_NATIVE_HANDLE_ANDROID_NVX,
 438       (EGLClientBuffer)handle, NULL /* no attribs */);
 439
 440   if (image == EGL_NO_IMAGE_KHR) {
 441     ALOGE("Failed to make image %s %p", GetEGLError(), handle);
 442     return -EINVAL;
 443   }
 444
 445   GLuint texture;
 446   glGenTextures(1, &texture);
 447   glBindTexture(GL_TEXTURE_2D, texture);
 448   glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
 449   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 450   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 451   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 452   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 453   glBindTexture(GL_TEXTURE_2D, 0);
 454
 455   out->image.reset(egl_display, image);
 456   out->texture.reset(texture);
 457
 458   return 0;
 459 }
 460
 461 GLWorkerCompositor::GLWorkerCompositor()
 462     : egl_display_(EGL_NO_DISPLAY), egl_ctx_(EGL_NO_CONTEXT) {
 463 }
 464
 465 int GLWorkerCompositor::Init() {
 466   int ret = 0;
 467   const char *egl_extensions;
 468   const char *gl_extensions;
 469   EGLint num_configs;
 470   EGLint attribs[] = {EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE, EGL_NONE};
 471   EGLConfig egl_config;
 472
 473   // clang-format off
 474   const GLfloat verts[] = {
 475     0.0f,  0.0f,    0.0f, 0.0f,
 476     0.0f,  2.0f,    0.0f, 2.0f,
 477     2.0f,  0.0f,    2.0f, 0.0f
 478   };
 479   // clang-format on
 480
 481   const EGLint config_attribs[] = {EGL_RENDERABLE_TYPE,
 482                                    EGL_OPENGL_ES2_BIT,
 483                                    EGL_RED_SIZE,
 484                                    8,
 485                                    EGL_GREEN_SIZE,
 486                                    8,
 487                                    EGL_BLUE_SIZE,
 488                                    8,
 489                                    EGL_NONE};
 490
 491   const EGLint context_attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE};
 492
 493   egl_display_ = eglGetDisplay(EGL_DEFAULT_DISPLAY);
 494   if (egl_display_ == EGL_NO_DISPLAY) {
 495     ALOGE("Failed to get egl display");
 496     return 1;
 497   }
 498
 499   if (!eglInitialize(egl_display_, NULL, NULL)) {
 500     ALOGE("Failed to initialize egl: %s", GetEGLError());
 501     return 1;
 502   }
 503
 504   egl_extensions = eglQueryString(egl_display_, EGL_EXTENSIONS);
 505
 506   // These extensions are all technically required but not always reported due
 507   // to meta EGL filtering them out.
 508   if (!HasExtension("EGL_KHR_image_base", egl_extensions))
 509     ALOGW("EGL_KHR_image_base extension not supported");
 510
 511   if (!HasExtension("EGL_ANDROID_image_native_buffer", egl_extensions))
 512     ALOGW("EGL_ANDROID_image_native_buffer extension not supported");
 513
 514   if (!HasExtension("EGL_ANDROID_native_fence_sync", egl_extensions))
 515     ALOGW("EGL_ANDROID_native_fence_sync extension not supported");
 516
 517   if (!eglChooseConfig(egl_display_, config_attribs, &egl_config, 1,
 518                        &num_configs)) {
 519     ALOGE("eglChooseConfig() failed with error: %s", GetEGLError());
 520     return 1;
 521   }
 522
 523   egl_ctx_ =
 524       eglCreateContext(egl_display_, egl_config,
 525                        EGL_NO_CONTEXT /* No shared context */, context_attribs);
 526
 527   if (egl_ctx_ == EGL_NO_CONTEXT) {
 528     ALOGE("Failed to create OpenGL ES Context: %s", GetEGLError());
 529     return 1;
 530   }
 531
 532   if (!eglMakeCurrent(egl_display_, EGL_NO_SURFACE, EGL_NO_SURFACE, egl_ctx_)) {
 533     ALOGE("Failed to make the OpenGL ES Context current: %s", GetEGLError());
 534     return 1;
 535   }
 536
 537   gl_extensions = (const char *)glGetString(GL_EXTENSIONS);
 538
 539   if (!HasExtension("GL_OES_EGL_image", gl_extensions))
 540     ALOGW("GL_OES_EGL_image extension not supported");
 541
 542   GLuint vertex_buffer;
 543   glGenBuffers(1, &vertex_buffer);
 544   glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
 545   glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
 546   glBindBuffer(GL_ARRAY_BUFFER, 0);
 547   vertex_buffer_.reset(vertex_buffer);
 548
 549   if (GenerateShaders(&blend_programs_)) {
 550     return 1;
 551   }
 552
 553   return 0;
 554 }
 555
 556 GLWorkerCompositor::~GLWorkerCompositor() {
 557   if (egl_display_ != EGL_NO_DISPLAY && egl_ctx_ != EGL_NO_CONTEXT)
 558     if (eglDestroyContext(egl_display_, egl_ctx_) == EGL_FALSE)
 559       ALOGE("Failed to destroy OpenGL ES Context: %s", GetEGLError());
 560 }
 561
 562 int GLWorkerCompositor::Composite(hwc_layer_1 *layers, size_t num_layers,
 563                                   const sp<GraphicBuffer> &framebuffer) {
 564   ATRACE_CALL();
 565   int ret = 0;
 566   size_t i;
 567   std::vector<AutoEGLImageAndGLTexture> layer_textures;
 568   std::vector<RenderingCommand> commands;
 569
 570   if (num_layers == 0) {
 571     return -EALREADY;
 572   }
 573
 574   GLint frame_width = framebuffer->getWidth();
 575   GLint frame_height = framebuffer->getHeight();
 576   CachedFramebuffer *cached_framebuffer =
 577       PrepareAndCacheFramebuffer(framebuffer);
 578   if (cached_framebuffer == NULL) {
 579     ALOGE("Composite failed because of failed framebuffer");
 580     return -EINVAL;
 581   }
 582
 583   for (i = 0; i < num_layers; i++) {
 584     struct hwc_layer_1 *layer = &layers[i];
 585
 586     if (ret) {
 587       if (layer->acquireFenceFd >= 0) {
 588         close(layer->acquireFenceFd);
 589         layer->acquireFenceFd = -1;
 590       }
 591       continue;
 592     }
 593
 594     layer_textures.emplace_back();
 595     ret = CreateTextureFromHandle(egl_display_, layer->handle,
 596                                   &layer_textures.back());
 597
 598     if (!ret) {
 599       ret = EGLFenceWait(egl_display_, layer->acquireFenceFd);
 600       layer->acquireFenceFd = -1;
 601     }
 602     if (ret) {
 603       layer_textures.pop_back();
 604       ret = -EINVAL;
 605     }
 606   }
 607
 608   if (ret)
 609     return ret;
 610
 611   ConstructCommands(layers, num_layers, &commands);
 612
 613   glViewport(0, 0, frame_width, frame_height);
 614
 615   glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 616   glClear(GL_COLOR_BUFFER_BIT);
 617
 618   glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer_.get());
 619   glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, NULL);
 620   glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4,
 621                         (void *)(sizeof(float) * 2));
 622   glEnableVertexAttribArray(0);
 623   glEnableVertexAttribArray(1);
 624   glEnable(GL_SCISSOR_TEST);
 625
 626   for (const RenderingCommand &cmd : commands) {
 627     if (cmd.texture_count <= 0) {
 628       continue;
 629     }
 630
 631     // TODO(zachr): handle the case of too many overlapping textures for one
 632     // area by falling back to rendering as many layers as possible using
 633     // multiple blending passes.
 634     if (cmd.texture_count > blend_programs_.size()) {
 635       ALOGE("Too many layers to render in one area");
 636       continue;
 637     }
 638
 639     GLint program = blend_programs_[cmd.texture_count - 1].get();
 640     glUseProgram(program);
 641     GLint gl_viewport_loc = glGetUniformLocation(program, "uViewport");
 642     GLint gl_tex_loc = glGetUniformLocation(program, "uLayerTextures");
 643     GLint gl_crop_loc = glGetUniformLocation(program, "uLayerCrop");
 644     GLint gl_alpha_loc = glGetUniformLocation(program, "uLayerAlpha");
 645     GLint gl_tex_matrix_loc = glGetUniformLocation(program, "uTexMatrix");
 646     glUniform4f(gl_viewport_loc, cmd.bounds[0] / (float)frame_width,
 647                 cmd.bounds[1] / (float)frame_height,
 648                 (cmd.bounds[2] - cmd.bounds[0]) / (float)frame_width,
 649                 (cmd.bounds[3] - cmd.bounds[1]) / (float)frame_height);
 650
 651     for (unsigned src_index = 0; src_index < cmd.texture_count; src_index++) {
 652       const RenderingCommand::TextureSource &src = cmd.textures[src_index];
 653       glUniform1f(gl_alpha_loc + src_index, src.alpha);
 654       glUniform4f(gl_crop_loc + src_index, src.crop_bounds[0],
 655                   src.crop_bounds[1], src.crop_bounds[2] - src.crop_bounds[0],
 656                   src.crop_bounds[3] - src.crop_bounds[1]);
 657       glUniform1i(gl_tex_loc + src_index, src_index);
 658       glUniformMatrix2fv(gl_tex_matrix_loc + src_index, 1, GL_FALSE,
 659                          src.texture_matrix);
 660       glActiveTexture(GL_TEXTURE0 + src_index);
 661       glBindTexture(GL_TEXTURE_2D,
 662                     layer_textures[src.texture_index].texture.get());
 663     }
 664
 665     glScissor(cmd.bounds[0], cmd.bounds[1], cmd.bounds[2] - cmd.bounds[0],
 666               cmd.bounds[3] - cmd.bounds[1]);
 667     glDrawArrays(GL_TRIANGLES, 0, 3);
 668
 669     for (unsigned src_index = 0; src_index < cmd.texture_count; src_index++) {
 670       glActiveTexture(GL_TEXTURE0 + src_index);
 671       glBindTexture(GL_TEXTURE_2D, 0);
 672     }
 673   }
 674
 675   glDisable(GL_SCISSOR_TEST);
 676   glActiveTexture(GL_TEXTURE0);
 677   glDisableVertexAttribArray(0);
 678   glDisableVertexAttribArray(1);
 679   glBindBuffer(GL_ARRAY_BUFFER, 0);
 680   glUseProgram(0);
 681
 682   glBindFramebuffer(GL_FRAMEBUFFER, 0);
 683
 684   return ret;
 685 }
 686
 687 void GLWorkerCompositor::Finish() {
 688   ATRACE_CALL();
 689   glFinish();
 690
 691   char use_framebuffer_cache_opt[PROPERTY_VALUE_MAX];
 692   property_get("hwc.drm.use_framebuffer_cache", use_framebuffer_cache_opt, "1");
 693   bool use_framebuffer_cache = atoi(use_framebuffer_cache_opt);
 694
 695   if (use_framebuffer_cache) {
 696     for (auto &fb : cached_framebuffers_)
 697       fb.strong_framebuffer.clear();
 698   } else {
 699     cached_framebuffers_.clear();
 700   }
 701 }
 702
 703 GLWorkerCompositor::CachedFramebuffer::CachedFramebuffer(
 704     const sp<GraphicBuffer> &gb, AutoEGLDisplayImage &&image,
 705     AutoGLTexture &&tex, AutoGLFramebuffer &&fb)
 706     : strong_framebuffer(gb),
 707       weak_framebuffer(gb),
 708       egl_fb_image(std::move(image)),
 709       gl_fb_tex(std::move(tex)),
 710       gl_fb(std::move(fb)) {
 711 }
 712
 713 bool GLWorkerCompositor::CachedFramebuffer::Promote() {
 714   if (strong_framebuffer.get() != NULL)
 715     return true;
 716   strong_framebuffer = weak_framebuffer.promote();
 717   return strong_framebuffer.get() != NULL;
 718 }
 719
 720 GLWorkerCompositor::CachedFramebuffer *
 721 GLWorkerCompositor::FindCachedFramebuffer(
 722     const sp<GraphicBuffer> &framebuffer) {
 723   for (auto &fb : cached_framebuffers_)
 724     if (fb.weak_framebuffer == framebuffer)
 725       return &fb;
 726   return NULL;
 727 }
 728
 729 GLWorkerCompositor::CachedFramebuffer *
 730 GLWorkerCompositor::PrepareAndCacheFramebuffer(
 731     const sp<GraphicBuffer> &framebuffer) {
 732   CachedFramebuffer *cached_framebuffer = FindCachedFramebuffer(framebuffer);
 733   if (cached_framebuffer != NULL) {
 734     if (cached_framebuffer->Promote()) {
 735       glBindFramebuffer(GL_FRAMEBUFFER, cached_framebuffer->gl_fb.get());
 736       return cached_framebuffer;
 737     }
 738
 739     for (auto it = cached_framebuffers_.begin();
 740          it != cached_framebuffers_.end(); ++it) {
 741       if (it->weak_framebuffer == framebuffer) {
 742         cached_framebuffers_.erase(it);
 743         break;
 744       }
 745     }
 746   }
 747
 748   AutoEGLDisplayImage egl_fb_image(
 749       egl_display_,
 750       eglCreateImageKHR(egl_display_, EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID,
 751                         (EGLClientBuffer)framebuffer->getNativeBuffer(),
 752                         NULL /* no attribs */));
 753
 754   if (egl_fb_image.image() == EGL_NO_IMAGE_KHR) {
 755     ALOGE("Failed to make image from target buffer: %s", GetEGLError());
 756     return NULL;
 757   }
 758
 759   GLuint gl_fb_tex;
 760   glGenTextures(1, &gl_fb_tex);
 761   AutoGLTexture gl_fb_tex_auto(gl_fb_tex);
 762   glBindTexture(GL_TEXTURE_2D, gl_fb_tex);
 763   glEGLImageTargetTexture2DOES(GL_TEXTURE_2D,
 764                                (GLeglImageOES)egl_fb_image.image());
 765   glBindTexture(GL_TEXTURE_2D, 0);
 766
 767   GLuint gl_fb;
 768   glGenFramebuffers(1, &gl_fb);
 769   AutoGLFramebuffer gl_fb_auto(gl_fb);
 770   glBindFramebuffer(GL_FRAMEBUFFER, gl_fb);
 771   glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
 772                          gl_fb_tex, 0);
 773
 774   if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
 775     ALOGE("Failed framebuffer check for created target buffer: %s",
 776           GetGLFramebufferError());
 777     return NULL;
 778   }
 779
 780   cached_framebuffers_.emplace_back(framebuffer, std::move(egl_fb_image),
 781                                     std::move(gl_fb_tex_auto),
 782                                     std::move(gl_fb_auto));
 783   return &cached_framebuffers_.back();
 784 }
 785
 786 }  // namespace android