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 "GLWorker"
  19
  20 #include <algorithm>
  21 #include <string>
  22 #include <sstream>
  23
  24 #include <sys/resource.h>
  25
  26 #include <hardware/hardware.h>
  27 #include <hardware/hwcomposer.h>
  28
  29 #include <ui/GraphicBuffer.h>
  30 #include <ui/PixelFormat.h>
  31
  32 #include <utils/Trace.h>
  33
  34 #include "glworker.h"
  35
  36 #include "seperate_rects.h"
  37
  38 // TODO(zachr): use hwc_drm_bo to turn buffer handles into textures
  39 #ifndef EGL_NATIVE_HANDLE_ANDROID_NVX
  40 #define EGL_NATIVE_HANDLE_ANDROID_NVX 0x322A
  41 #endif
  42
  43 #define MAX_OVERLAPPING_LAYERS 64
  44
  45 namespace android {
  46
  47 typedef seperate_rects::Rect<float> FRect;
  48 typedef seperate_rects::RectSet<uint64_t, float> FRectSet;
  49
  50 // clang-format off
  51 // Column-major order:
  52 // float mat[4] = { 1, 2, 3, 4 } ===
  53 // [ 1 3 ]
  54 // [ 2 4 ]
  55 float kTextureTransformMatrices[] = {
  56    1.0f,  0.0f,  0.0f,  1.0f, // identity matrix
  57   -1.0f,  0.0f,  0.0f,  1.0f, // HWC_TRANSFORM_FLIP_H;
  58    1.0f,  0.0f,  0.0f, -1.0f, // HWC_TRANSFORM_FLIP_V;
  59    0.0f,  1.0f, -1.0f,  0.0f, // HWC_TRANSFORM_ROT_90;
  60   -1.0f,  0.0f,  0.0f, -1.0f, // HWC_TRANSFORM_ROT_180;
  61    0.0f, -1.0f,  1.0f,  0.0f, // HWC_TRANSFORM_ROT_270;
  62 };
  63 // clang-format on
  64
  65 static const char *GetGLError(void) {
  66   switch (glGetError()) {
  67     case GL_NO_ERROR:
  68       return "GL_NO_ERROR";
  69     case GL_INVALID_ENUM:
  70       return "GL_INVALID_ENUM";
  71     case GL_INVALID_VALUE:
  72       return "GL_INVALID_VALUE";
  73     case GL_INVALID_OPERATION:
  74       return "GL_INVALID_OPERATION";
  75     case GL_INVALID_FRAMEBUFFER_OPERATION:
  76       return "GL_INVALID_FRAMEBUFFER_OPERATION";
  77     case GL_OUT_OF_MEMORY:
  78       return "GL_OUT_OF_MEMORY";
  79     default:
  80       return "Unknown error";
  81   }
  82 }
  83
  84 static const char *GetGLFramebufferError(void) {
  85   switch (glCheckFramebufferStatus(GL_FRAMEBUFFER)) {
  86     case GL_FRAMEBUFFER_COMPLETE:
  87       return "GL_FRAMEBUFFER_COMPLETE";
  88     case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
  89       return "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT";
  90     case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
  91       return "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT";
  92     case GL_FRAMEBUFFER_UNSUPPORTED:
  93       return "GL_FRAMEBUFFER_UNSUPPORTED";
  94     case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
  95       return "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS";
  96     default:
  97       return "Unknown error";
  98   }
  99 }
 100
 101 static const char *GetEGLError(void) {
 102   switch (eglGetError()) {
 103     case EGL_SUCCESS:
 104       return "EGL_SUCCESS";
 105     case EGL_NOT_INITIALIZED:
 106       return "EGL_NOT_INITIALIZED";
 107     case EGL_BAD_ACCESS:
 108       return "EGL_BAD_ACCESS";
 109     case EGL_BAD_ALLOC:
 110       return "EGL_BAD_ALLOC";
 111     case EGL_BAD_ATTRIBUTE:
 112       return "EGL_BAD_ATTRIBUTE";
 113     case EGL_BAD_CONTEXT:
 114       return "EGL_BAD_CONTEXT";
 115     case EGL_BAD_CONFIG:
 116       return "EGL_BAD_CONFIG";
 117     case EGL_BAD_CURRENT_SURFACE:
 118       return "EGL_BAD_CURRENT_SURFACE";
 119     case EGL_BAD_DISPLAY:
 120       return "EGL_BAD_DISPLAY";
 121     case EGL_BAD_SURFACE:
 122       return "EGL_BAD_SURFACE";
 123     case EGL_BAD_MATCH:
 124       return "EGL_BAD_MATCH";
 125     case EGL_BAD_PARAMETER:
 126       return "EGL_BAD_PARAMETER";
 127     case EGL_BAD_NATIVE_PIXMAP:
 128       return "EGL_BAD_NATIVE_PIXMAP";
 129     case EGL_BAD_NATIVE_WINDOW:
 130       return "EGL_BAD_NATIVE_WINDOW";
 131     case EGL_CONTEXT_LOST:
 132       return "EGL_CONTEXT_LOST";
 133     default:
 134       return "Unknown error";
 135   }
 136 }
 137
 138 static bool HasExtension(const char *extension, const char *extensions) {
 139   const char *start, *where, *terminator;
 140   start = extensions;
 141   for (;;) {
 142     where = (char *)strstr((const char *)start, extension);
 143     if (!where)
 144       break;
 145     terminator = where + strlen(extension);
 146     if (where == start || *(where - 1) == ' ')
 147       if (*terminator == ' ' || *terminator == '\0')
 148         return true;
 149     start = terminator;
 150   }
 151   return false;
 152 }
 153
 154 static AutoGLShader CompileAndCheckShader(GLenum type, unsigned source_count,
 155                                           const GLchar **sources,
 156                                           std::string *shader_log) {
 157   GLint status;
 158   AutoGLShader shader(glCreateShader(type));
 159   if (shader.get() == 0) {
 160     *shader_log = "glCreateShader failed";
 161     return 0;
 162   }
 163   glShaderSource(shader.get(), source_count, sources, NULL);
 164   glCompileShader(shader.get());
 165   glGetShaderiv(shader.get(), GL_COMPILE_STATUS, &status);
 166   if (!status) {
 167     if (shader_log) {
 168       GLint log_length;
 169       glGetShaderiv(shader.get(), GL_INFO_LOG_LENGTH, &log_length);
 170       shader_log->resize(log_length);
 171       glGetShaderInfoLog(shader.get(), log_length, NULL, &(*shader_log)[0]);
 172     }
 173     return 0;
 174   }
 175
 176   return shader;
 177 }
 178
 179 static int GenerateShaders(std::vector<AutoGLProgram> *blend_programs) {
 180   // Limits: GL_MAX_VARYING_COMPONENTS, GL_MAX_TEXTURE_IMAGE_UNITS,
 181   // GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
 182   // clang-format off
 183   const GLchar *shader_preamble = "#version 300 es\n#define LAYER_COUNT ";
 184
 185   const GLchar *vertex_shader_source =
 186 "\n"
 187 "precision mediump int;                                                     \n"
 188 "uniform vec4 uViewport;                                                    \n"
 189 "uniform sampler2D uLayerTextures[LAYER_COUNT];                             \n"
 190 "uniform vec4 uLayerCrop[LAYER_COUNT];                                      \n"
 191 "uniform mat2 uTexMatrix[LAYER_COUNT];                                      \n"
 192 "in vec2 vPosition;                                                         \n"
 193 "in vec2 vTexCoords;                                                        \n"
 194 "out vec2 fTexCoords[LAYER_COUNT];                                          \n"
 195 "void main() {                                                              \n"
 196 "  for (int i = 0; i < LAYER_COUNT; i++) {                                  \n"
 197 "    fTexCoords[i] = (uLayerCrop[i].xy + vTexCoords * uLayerCrop[i].zw) /   \n"
 198 "                     vec2(textureSize(uLayerTextures[i], 0));              \n"
 199 "    fTexCoords[i] *= uTexMatrix[i];                                        \n"
 200 "  }                                                                        \n"
 201 "  vec2 scaledPosition = uViewport.xy + vPosition * uViewport.zw;           \n"
 202 "  gl_Position = vec4(scaledPosition * vec2(2.0) - vec2(1.0), 0.0, 1.0);    \n"
 203 "}                                                                          \n";
 204
 205   const GLchar *fragment_shader_source =
 206 "\n"
 207 "precision mediump float;                                                   \n"
 208 "uniform sampler2D uLayerTextures[LAYER_COUNT];                             \n"
 209 "uniform float uLayerAlpha[LAYER_COUNT];                                    \n"
 210 "in vec2 fTexCoords[LAYER_COUNT];                                           \n"
 211 "out vec4 oFragColor;                                                       \n"
 212 "void main() {                                                              \n"
 213 "  vec3 color = vec3(0.0, 0.0, 0.0);                                        \n"
 214 "  float alphaCover = 1.0;                                                  \n"
 215 "  for (int i = 0; i < LAYER_COUNT; i++) {                                  \n"
 216 "    vec4 texSample = texture(uLayerTextures[i], fTexCoords[i]);            \n"
 217 "    float a = texSample.a * uLayerAlpha[i];                                \n"
 218 "    color += a * alphaCover * texSample.rgb;                               \n"
 219 "    alphaCover *= 1.0 - a;                                                 \n"
 220 "    if (alphaCover <= 0.5/255.0)                                           \n"
 221 "      break;                                                               \n"
 222 "  }                                                                        \n"
 223 "  oFragColor = vec4(color, 1.0 - alphaCover);                              \n"
 224 "}                                                                          \n";
 225   // clang-format on
 226
 227   int i, ret = 1;
 228   GLint max_texture_images, status;
 229   AutoGLShader vertex_shader, fragment_shader;
 230   AutoGLProgram program;
 231   std::string shader_log;
 232
 233   glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &max_texture_images);
 234
 235   for (i = 1; i <= max_texture_images; i++) {
 236     std::ostringstream layer_count_formatter;
 237     layer_count_formatter << i;
 238     std::string layer_count(layer_count_formatter.str());
 239     const GLchar *shader_sources[3] = {shader_preamble, layer_count.c_str(),
 240                                        NULL};
 241
 242     shader_sources[2] = vertex_shader_source;
 243     vertex_shader = CompileAndCheckShader(GL_VERTEX_SHADER, 3, shader_sources,
 244                                           ret ? &shader_log : NULL);
 245     if (!vertex_shader.get()) {
 246       if (ret)
 247         ALOGE("Failed to make vertex shader:\n%s", shader_log.c_str());
 248       break;
 249     }
 250
 251     shader_sources[2] = fragment_shader_source;
 252     fragment_shader = CompileAndCheckShader(
 253         GL_FRAGMENT_SHADER, 3, shader_sources, ret ? &shader_log : NULL);
 254     if (!fragment_shader.get()) {
 255       if (ret)
 256         ALOGE("Failed to make fragment shader:\n%s", shader_log.c_str());
 257       break;
 258     }
 259
 260     program = AutoGLProgram(glCreateProgram());
 261     if (!program.get()) {
 262       if (ret)
 263         ALOGE("Failed to create program %s", GetGLError());
 264       break;
 265     }
 266
 267     glAttachShader(program.get(), vertex_shader.get());
 268     glAttachShader(program.get(), fragment_shader.get());
 269     glBindAttribLocation(program.get(), 0, "vPosition");
 270     glBindAttribLocation(program.get(), 1, "vTexCoords");
 271     glLinkProgram(program.get());
 272     glDetachShader(program.get(), vertex_shader.get());
 273     glDetachShader(program.get(), fragment_shader.get());
 274
 275     glGetProgramiv(program.get(), GL_LINK_STATUS, &status);
 276     if (!status) {
 277       if (ret) {
 278         GLint log_length;
 279         glGetProgramiv(program.get(), GL_INFO_LOG_LENGTH, &log_length);
 280         std::string program_log(log_length, ' ');
 281         glGetProgramInfoLog(program.get(), log_length, NULL, &program_log[0]);
 282         ALOGE("Failed to link program: \n%s", program_log.c_str());
 283       }
 284       break;
 285     }
 286
 287     ret = 0;
 288     blend_programs->emplace_back(std::move(program));
 289   }
 290
 291   return ret;
 292 }
 293
 294 struct RenderingCommand {
 295   struct TextureSource {
 296     unsigned texture_index;
 297     float crop_bounds[4];
 298     float alpha;
 299     float texture_matrix[4];
 300   };
 301
 302   float bounds[4];
 303   unsigned texture_count;
 304   TextureSource textures[MAX_OVERLAPPING_LAYERS];
 305
 306   RenderingCommand() : texture_count(0) {
 307   }
 308 };
 309
 310 static void ConstructCommands(const hwc_layer_1 *layers, size_t num_layers,
 311                               std::vector<RenderingCommand> *commands) {
 312   std::vector<FRect> in_rects;
 313   std::vector<FRectSet> out_rects;
 314   int i;
 315
 316   for (unsigned rect_index = 0; rect_index < num_layers; rect_index++) {
 317     const hwc_layer_1 &layer = layers[rect_index];
 318     FRect rect;
 319     in_rects.push_back(FRect(layer.displayFrame.left, layer.displayFrame.top,
 320                              layer.displayFrame.right,
 321                              layer.displayFrame.bottom));
 322   }
 323
 324   seperate_frects_64(in_rects, &out_rects);
 325
 326   for (unsigned rect_index = 0; rect_index < out_rects.size(); rect_index++) {
 327     const FRectSet &out_rect = out_rects[rect_index];
 328     commands->push_back(RenderingCommand());
 329     RenderingCommand &cmd = commands->back();
 330
 331     memcpy(cmd.bounds, out_rect.rect.bounds, sizeof(cmd.bounds));
 332
 333     uint64_t tex_set = out_rect.id_set.getBits();
 334     for (unsigned i = num_layers - 1; tex_set != 0x0; i--) {
 335       if (tex_set & (0x1 << i)) {
 336         tex_set &= ~(0x1 << i);
 337
 338         const hwc_layer_1 &layer = layers[i];
 339
 340         FRect display_rect(layer.displayFrame.left, layer.displayFrame.top,
 341                            layer.displayFrame.right, layer.displayFrame.bottom);
 342         float display_size[2] = {
 343             display_rect.bounds[2] - display_rect.bounds[0],
 344             display_rect.bounds[3] - display_rect.bounds[1]};
 345
 346         FRect crop_rect(layer.sourceCropf.left, layer.sourceCropf.top,
 347                         layer.sourceCropf.right, layer.sourceCropf.bottom);
 348         float crop_size[2] = {crop_rect.bounds[2] - crop_rect.bounds[0],
 349                               crop_rect.bounds[3] - crop_rect.bounds[1]};
 350
 351         RenderingCommand::TextureSource &src = cmd.textures[cmd.texture_count];
 352         cmd.texture_count++;
 353         src.texture_index = i;
 354
 355         for (int b = 0; b < 4; b++) {
 356           float bound_percent = (cmd.bounds[b] - display_rect.bounds[b % 2]) /
 357                                 display_size[b % 2];
 358           src.crop_bounds[b] =
 359               crop_rect.bounds[b % 2] + bound_percent * crop_size[b % 2];
 360         }
 361
 362         float *src_tex_mat;
 363         switch (layer.transform) {
 364           case HWC_TRANSFORM_FLIP_H:
 365             src_tex_mat = &kTextureTransformMatrices[4];
 366             break;
 367           case HWC_TRANSFORM_FLIP_V:
 368             src_tex_mat = &kTextureTransformMatrices[8];
 369             break;
 370           case HWC_TRANSFORM_ROT_90:
 371             src_tex_mat = &kTextureTransformMatrices[12];
 372             break;
 373           case HWC_TRANSFORM_ROT_180:
 374             src_tex_mat = &kTextureTransformMatrices[16];
 375             break;
 376           case HWC_TRANSFORM_ROT_270:
 377             src_tex_mat = &kTextureTransformMatrices[20];
 378             break;
 379           default:
 380             ALOGE(
 381                 "Unknown transform for layer: defaulting to identity "
 382                 "transform");
 383           case 0:
 384             src_tex_mat = &kTextureTransformMatrices[0];
 385             break;
 386         }
 387         std::copy_n(src_tex_mat, 4, src.texture_matrix);
 388
 389         if (layer.blending == HWC_BLENDING_NONE) {
 390           src.alpha = 1.0f;
 391           // This layer is opaque. There is no point in using layers below this
 392           // one.
 393           break;
 394         }
 395
 396         src.alpha = layer.planeAlpha / 255.0f;
 397       }
 398     }
 399   }
 400 }
 401
 402 static int EGLFenceWait(EGLDisplay egl_display, int acquireFenceFd) {
 403   int ret = 0;
 404
 405   EGLint attribs[] = {EGL_SYNC_NATIVE_FENCE_FD_ANDROID, acquireFenceFd,
 406                       EGL_NONE};
 407   EGLSyncKHR egl_sync =
 408       eglCreateSyncKHR(egl_display, EGL_SYNC_NATIVE_FENCE_ANDROID, attribs);
 409   if (egl_sync == EGL_NO_SYNC_KHR) {
 410     ALOGE("Failed to make EGLSyncKHR from acquireFenceFd: %s", GetEGLError());
 411     close(acquireFenceFd);
 412     return 1;
 413   }
 414
 415   EGLint success = eglWaitSyncKHR(egl_display, egl_sync, 0);
 416   if (success == EGL_FALSE) {
 417     ALOGE("Failed to wait for acquire: %s", GetEGLError());
 418     ret = 1;
 419   }
 420   eglDestroySyncKHR(egl_display, egl_sync);
 421
 422   return ret;
 423 }
 424
 425 static int CreateTextureFromHandle(EGLDisplay egl_display,
 426                                    buffer_handle_t handle,
 427                                    AutoEGLImageAndGLTexture *out) {
 428   EGLImageKHR image = eglCreateImageKHR(
 429       egl_display, EGL_NO_CONTEXT, EGL_NATIVE_HANDLE_ANDROID_NVX,
 430       (EGLClientBuffer)handle, NULL /* no attribs */);
 431
 432   if (image == EGL_NO_IMAGE_KHR) {
 433     ALOGE("Failed to make image %s %p", GetEGLError(), handle);
 434     return -EINVAL;
 435   }
 436
 437   GLuint texture;
 438   glGenTextures(1, &texture);
 439   glBindTexture(GL_TEXTURE_2D, texture);
 440   glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
 441   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 442   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 443   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 444   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 445   glBindTexture(GL_TEXTURE_2D, 0);
 446
 447   out->image.reset(image);
 448   out->texture.reset(texture);
 449
 450   return 0;
 451 }
 452
 453 GLWorkerCompositor::GLWorkerCompositor()
 454     : egl_display_(EGL_NO_DISPLAY), egl_ctx_(EGL_NO_CONTEXT) {
 455 }
 456
 457 int GLWorkerCompositor::Init() {
 458   int ret = 0;
 459   const char *egl_extensions;
 460   const char *gl_extensions;
 461   EGLint num_configs;
 462   EGLint attribs[] = {EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE, EGL_NONE};
 463   EGLConfig egl_config;
 464
 465   // clang-format off
 466   const GLfloat verts[] = {
 467     0.0f,  0.0f,    0.0f, 0.0f,
 468     0.0f,  2.0f,    0.0f, 2.0f,
 469     2.0f,  0.0f,    2.0f, 0.0f
 470   };
 471   // clang-format on
 472
 473   const EGLint config_attribs[] = {EGL_RENDERABLE_TYPE,
 474                                    EGL_OPENGL_ES2_BIT,
 475                                    EGL_RED_SIZE,
 476                                    8,
 477                                    EGL_GREEN_SIZE,
 478                                    8,
 479                                    EGL_BLUE_SIZE,
 480                                    8,
 481                                    EGL_NONE};
 482
 483   const EGLint context_attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE};
 484
 485   egl_display_ = eglGetDisplay(EGL_DEFAULT_DISPLAY);
 486   if (egl_display_ == EGL_NO_DISPLAY) {
 487     ALOGE("Failed to get egl display");
 488     return 1;
 489   }
 490
 491   if (!eglInitialize(egl_display_, NULL, NULL)) {
 492     ALOGE("Failed to initialize egl: %s", GetEGLError());
 493     return 1;
 494   }
 495
 496   egl_extensions = eglQueryString(egl_display_, EGL_EXTENSIONS);
 497
 498   // These extensions are all technically required but not always reported due
 499   // to meta EGL filtering them out.
 500   if (!HasExtension("EGL_KHR_image_base", egl_extensions))
 501     ALOGW("EGL_KHR_image_base extension not supported");
 502
 503   if (!HasExtension("EGL_ANDROID_image_native_buffer", egl_extensions))
 504     ALOGW("EGL_ANDROID_image_native_buffer extension not supported");
 505
 506   if (!HasExtension("EGL_ANDROID_native_fence_sync", egl_extensions))
 507     ALOGW("EGL_ANDROID_native_fence_sync extension not supported");
 508
 509   if (!eglChooseConfig(egl_display_, config_attribs, &egl_config, 1,
 510                        &num_configs)) {
 511     ALOGE("eglChooseConfig() failed with error: %s", GetEGLError());
 512     return 1;
 513   }
 514
 515   egl_ctx_ =
 516       eglCreateContext(egl_display_, egl_config,
 517                        EGL_NO_CONTEXT /* No shared context */, context_attribs);
 518
 519   if (egl_ctx_ == EGL_NO_CONTEXT) {
 520     ALOGE("Failed to create OpenGL ES Context: %s", GetEGLError());
 521     return 1;
 522   }
 523
 524   if (!eglMakeCurrent(egl_display_, EGL_NO_SURFACE, EGL_NO_SURFACE, egl_ctx_)) {
 525     ALOGE("Failed to make the OpenGL ES Context current: %s", GetEGLError());
 526     return 1;
 527   }
 528
 529   gl_extensions = (const char *)glGetString(GL_EXTENSIONS);
 530
 531   if (!HasExtension("GL_OES_EGL_image", gl_extensions))
 532     ALOGW("GL_OES_EGL_image extension not supported");
 533
 534   GLuint vertex_buffer;
 535   glGenBuffers(1, &vertex_buffer);
 536   glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
 537   glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
 538   glBindBuffer(GL_ARRAY_BUFFER, 0);
 539   vertex_buffer_.reset(vertex_buffer);
 540
 541   if (GenerateShaders(&blend_programs_)) {
 542     return 1;
 543   }
 544
 545   return 0;
 546 }
 547
 548 GLWorkerCompositor::~GLWorkerCompositor() {
 549   if (egl_display_ != EGL_NO_DISPLAY && egl_ctx_ != EGL_NO_CONTEXT)
 550     if (eglDestroyContext(egl_display_, egl_ctx_) == EGL_FALSE)
 551       ALOGE("Failed to destroy OpenGL ES Context: %s", GetEGLError());
 552 }
 553
 554 int GLWorkerCompositor::Composite(hwc_layer_1 *layers, size_t num_layers,
 555                                   sp<GraphicBuffer> framebuffer) {
 556   ATRACE_CALL();
 557   int ret = 0;
 558   size_t i;
 559   std::vector<AutoEGLImageAndGLTexture> layer_textures;
 560   std::vector<RenderingCommand> commands;
 561
 562   if (num_layers == 0) {
 563     return -EALREADY;
 564   }
 565
 566   GLint frame_width = framebuffer->getWidth();
 567   GLint frame_height = framebuffer->getHeight();
 568   EGLSyncKHR finished_sync;
 569
 570   AutoEGLImageKHR egl_fb_image(
 571       eglCreateImageKHR(egl_display_, EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID,
 572                         (EGLClientBuffer)framebuffer->getNativeBuffer(),
 573                         NULL /* no attribs */),
 574       EGLImageDeleter(egl_display_));
 575
 576   if (egl_fb_image.get() == EGL_NO_IMAGE_KHR) {
 577     ALOGE("Failed to make image from target buffer: %s", GetEGLError());
 578     return -EINVAL;
 579   }
 580
 581   GLuint gl_fb_tex;
 582   glGenTextures(1, &gl_fb_tex);
 583   AutoGLTexture gl_fb_tex_auto(gl_fb_tex);
 584   glBindTexture(GL_TEXTURE_2D, gl_fb_tex);
 585   glEGLImageTargetTexture2DOES(GL_TEXTURE_2D,
 586                                (GLeglImageOES)egl_fb_image.get());
 587   glBindTexture(GL_TEXTURE_2D, 0);
 588
 589   GLuint gl_fb;
 590   glGenFramebuffers(1, &gl_fb);
 591   AutoGLFramebuffer gl_fb_auto(gl_fb);
 592   glBindFramebuffer(GL_FRAMEBUFFER, gl_fb);
 593   glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
 594                          gl_fb_tex, 0);
 595
 596   if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
 597     ALOGE("Failed framebuffer check for created target buffer: %s",
 598           GetGLFramebufferError());
 599     return -EINVAL;
 600   }
 601
 602   for (i = 0; i < num_layers; i++) {
 603     const struct hwc_layer_1 *layer = &layers[i];
 604
 605     if (ret) {
 606       if (layer->acquireFenceFd >= 0)
 607         close(layer->acquireFenceFd);
 608       continue;
 609     }
 610
 611     layer_textures.emplace_back(egl_display_);
 612     ret = CreateTextureFromHandle(egl_display_, layer->handle,
 613                                   &layer_textures.back());
 614     if (!ret) {
 615       ret = EGLFenceWait(egl_display_, layer->acquireFenceFd);
 616     }
 617     if (ret) {
 618       layer_textures.pop_back();
 619       ret = -EINVAL;
 620     }
 621   }
 622
 623   if (ret)
 624     return ret;
 625
 626   ConstructCommands(layers, num_layers, &commands);
 627
 628   glViewport(0, 0, frame_width, frame_height);
 629
 630   glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 631   glClear(GL_COLOR_BUFFER_BIT);
 632
 633   glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer_.get());
 634   glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, NULL);
 635   glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4,
 636                         (void *)(sizeof(float) * 2));
 637   glEnableVertexAttribArray(0);
 638   glEnableVertexAttribArray(1);
 639   glEnable(GL_SCISSOR_TEST);
 640
 641   for (const RenderingCommand &cmd : commands) {
 642     if (cmd.texture_count <= 0) {
 643       continue;
 644     }
 645
 646     // TODO(zachr): handle the case of too many overlapping textures for one
 647     // area by falling back to rendering as many layers as possible using
 648     // multiple blending passes.
 649     if (cmd.texture_count > blend_programs_.size()) {
 650       ALOGE("Too many layers to render in one area");
 651       continue;
 652     }
 653
 654     GLint program = blend_programs_[cmd.texture_count - 1].get();
 655     glUseProgram(program);
 656     GLint gl_viewport_loc = glGetUniformLocation(program, "uViewport");
 657     GLint gl_tex_loc = glGetUniformLocation(program, "uLayerTextures");
 658     GLint gl_crop_loc = glGetUniformLocation(program, "uLayerCrop");
 659     GLint gl_alpha_loc = glGetUniformLocation(program, "uLayerAlpha");
 660     GLint gl_tex_matrix_loc = glGetUniformLocation(program, "uTexMatrix");
 661     glUniform4f(gl_viewport_loc, cmd.bounds[0] / (float)frame_width,
 662                 cmd.bounds[1] / (float)frame_height,
 663                 (cmd.bounds[2] - cmd.bounds[0]) / (float)frame_width,
 664                 (cmd.bounds[3] - cmd.bounds[1]) / (float)frame_height);
 665
 666     for (unsigned src_index = 0; src_index < cmd.texture_count; src_index++) {
 667       const RenderingCommand::TextureSource &src = cmd.textures[src_index];
 668       glUniform1f(gl_alpha_loc + src_index, src.alpha);
 669       glUniform4f(gl_crop_loc + src_index, src.crop_bounds[0],
 670                   src.crop_bounds[1], src.crop_bounds[2] - src.crop_bounds[0],
 671                   src.crop_bounds[3] - src.crop_bounds[1]);
 672       glUniform1i(gl_tex_loc + src_index, src_index);
 673       glUniformMatrix2fv(gl_tex_matrix_loc + src_index, 1, GL_FALSE,
 674                          src.texture_matrix);
 675       glActiveTexture(GL_TEXTURE0 + src_index);
 676       glBindTexture(GL_TEXTURE_2D,
 677                     layer_textures[src.texture_index].texture.get());
 678     }
 679
 680     glScissor(cmd.bounds[0], cmd.bounds[1], cmd.bounds[2] - cmd.bounds[0],
 681               cmd.bounds[3] - cmd.bounds[1]);
 682     glDrawArrays(GL_TRIANGLES, 0, 3);
 683
 684     for (unsigned src_index = 0; src_index < cmd.texture_count; src_index++) {
 685       glActiveTexture(GL_TEXTURE0 + src_index);
 686       glBindTexture(GL_TEXTURE_2D, 0);
 687     }
 688   }
 689
 690   glDisable(GL_SCISSOR_TEST);
 691   glActiveTexture(GL_TEXTURE0);
 692   glDisableVertexAttribArray(0);
 693   glDisableVertexAttribArray(1);
 694   glBindBuffer(GL_ARRAY_BUFFER, 0);
 695   glUseProgram(0);
 696
 697   glBindFramebuffer(GL_FRAMEBUFFER, 0);
 698
 699   return ret;
 700 }
 701
 702 int GLWorkerCompositor::CompositeAndFinish(hwc_layer_1 *layers,
 703                                            size_t num_layers,
 704                                            sp<GraphicBuffer> framebuffer) {
 705   int ret = Composite(layers, num_layers, framebuffer);
 706   glFinish();
 707   return ret;
 708 }
 709
 710 }  // namespace android