gpu/command_buffer/service/feature_info.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gpu/command_buffer/service/feature_info.h"
   6
   7 #include <set>
   8
   9 #include "base/command_line.h"
  10 #include "base/macros.h"
  11 #include "base/metrics/histogram.h"
  12 #include "base/strings/string_number_conversions.h"
  13 #include "base/strings/string_split.h"
  14 #include "base/strings/string_util.h"
  15 #include "gpu/command_buffer/service/gl_utils.h"
  16 #include "gpu/command_buffer/service/gpu_switches.h"
  17 #include "ui/gl/gl_fence.h"
  18 #include "ui/gl/gl_implementation.h"
  19
  20 namespace gpu {
  21 namespace gles2 {
  22
  23 namespace {
  24
  25 struct FormatInfo {
  26   GLenum format;
  27   const GLenum* types;
  28   size_t count;
  29 };
  30
  31 class StringSet {
  32  public:
  33   StringSet() {}
  34
  35   StringSet(const char* s) {
  36     Init(s);
  37   }
  38
  39   StringSet(const std::string& str) {
  40     Init(str);
  41   }
  42
  43   void Init(const char* s) {
  44     std::string str(s ? s : "");
  45     Init(str);
  46   }
  47
  48   void Init(const std::string& str) {
  49     std::vector<std::string> tokens;
  50     Tokenize(str, " ", &tokens);
  51     string_set_.insert(tokens.begin(), tokens.end());
  52   }
  53
  54   bool Contains(const char* s) {
  55     return string_set_.find(s) != string_set_.end();
  56   }
  57
  58   bool Contains(const std::string& s) {
  59     return string_set_.find(s) != string_set_.end();
  60   }
  61
  62  private:
  63   std::set<std::string> string_set_;
  64 };
  65
  66 // Process a string of wordaround type IDs (seperated by ',') and set up
  67 // the corresponding Workaround flags.
  68 void StringToWorkarounds(
  69     const std::string& types, FeatureInfo::Workarounds* workarounds) {
  70   DCHECK(workarounds);
  71   std::vector<std::string> pieces;
  72   base::SplitString(types, ',', &pieces);
  73   for (size_t i = 0; i < pieces.size(); ++i) {
  74     int number = 0;
  75     bool succeed = base::StringToInt(pieces[i], &number);
  76     DCHECK(succeed);
  77     switch (number) {
  78 #define GPU_OP(type, name)    \
  79   case gpu::type:             \
  80     workarounds->name = true; \
  81     break;
  82       GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
  83 #undef GPU_OP
  84       default:
  85         NOTIMPLEMENTED();
  86     }
  87   }
  88   if (workarounds->max_texture_size_limit_4096)
  89     workarounds->max_texture_size = 4096;
  90   if (workarounds->max_cube_map_texture_size_limit_4096)
  91     workarounds->max_cube_map_texture_size = 4096;
  92   if (workarounds->max_cube_map_texture_size_limit_1024)
  93     workarounds->max_cube_map_texture_size = 1024;
  94   if (workarounds->max_cube_map_texture_size_limit_512)
  95     workarounds->max_cube_map_texture_size = 512;
  96
  97   if (workarounds->max_fragment_uniform_vectors_32)
  98     workarounds->max_fragment_uniform_vectors = 32;
  99   if (workarounds->max_varying_vectors_16)
 100     workarounds->max_varying_vectors = 16;
 101   if (workarounds->max_vertex_uniform_vectors_256)
 102     workarounds->max_vertex_uniform_vectors = 256;
 103 }
 104
 105 }  // anonymous namespace.
 106
 107 FeatureInfo::FeatureFlags::FeatureFlags()
 108     : chromium_color_buffer_float_rgba(false),
 109       chromium_color_buffer_float_rgb(false),
 110       chromium_framebuffer_multisample(false),
 111       chromium_sync_query(false),
 112       use_core_framebuffer_multisample(false),
 113       multisampled_render_to_texture(false),
 114       use_img_for_multisampled_render_to_texture(false),
 115       oes_standard_derivatives(false),
 116       oes_egl_image_external(false),
 117       oes_depth24(false),
 118       oes_compressed_etc1_rgb8_texture(false),
 119       packed_depth24_stencil8(false),
 120       npot_ok(false),
 121       enable_texture_float_linear(false),
 122       enable_texture_half_float_linear(false),
 123       angle_translated_shader_source(false),
 124       angle_pack_reverse_row_order(false),
 125       arb_texture_rectangle(false),
 126       angle_instanced_arrays(false),
 127       occlusion_query_boolean(false),
 128       use_arb_occlusion_query2_for_occlusion_query_boolean(false),
 129       use_arb_occlusion_query_for_occlusion_query_boolean(false),
 130       native_vertex_array_object(false),
 131       ext_texture_format_bgra8888(false),
 132       enable_shader_name_hashing(false),
 133       enable_samplers(false),
 134       ext_draw_buffers(false),
 135       ext_frag_depth(false),
 136       ext_shader_texture_lod(false),
 137       use_async_readpixels(false),
 138       map_buffer_range(false),
 139       ext_discard_framebuffer(false),
 140       angle_depth_texture(false),
 141       is_angle(false),
 142       is_swiftshader(false),
 143       angle_texture_usage(false),
 144       ext_texture_storage(false) {
 145 }
 146
 147 FeatureInfo::Workarounds::Workarounds() :
 148 #define GPU_OP(type, name) name(false),
 149     GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
 150 #undef GPU_OP
 151     max_texture_size(0),
 152     max_cube_map_texture_size(0),
 153     max_fragment_uniform_vectors(0),
 154     max_varying_vectors(0),
 155     max_vertex_uniform_vectors(0) {
 156 }
 157
 158 FeatureInfo::FeatureInfo() {
 159   InitializeBasicState(*CommandLine::ForCurrentProcess());
 160 }
 161
 162 FeatureInfo::FeatureInfo(const CommandLine& command_line) {
 163   InitializeBasicState(command_line);
 164 }
 165
 166 void FeatureInfo::InitializeBasicState(const CommandLine& command_line) {
 167   if (command_line.HasSwitch(switches::kGpuDriverBugWorkarounds)) {
 168     std::string types = command_line.GetSwitchValueASCII(
 169         switches::kGpuDriverBugWorkarounds);
 170     StringToWorkarounds(types, &workarounds_);
 171   }
 172   feature_flags_.enable_shader_name_hashing =
 173       !command_line.HasSwitch(switches::kDisableShaderNameHashing);
 174
 175   feature_flags_.is_swiftshader =
 176       (command_line.GetSwitchValueASCII(switches::kUseGL) == "swiftshader");
 177
 178   static const GLenum kAlphaTypes[] = {
 179       GL_UNSIGNED_BYTE,
 180   };
 181   static const GLenum kRGBTypes[] = {
 182       GL_UNSIGNED_BYTE,
 183       GL_UNSIGNED_SHORT_5_6_5,
 184   };
 185   static const GLenum kRGBATypes[] = {
 186       GL_UNSIGNED_BYTE,
 187       GL_UNSIGNED_SHORT_4_4_4_4,
 188       GL_UNSIGNED_SHORT_5_5_5_1,
 189   };
 190   static const GLenum kLuminanceTypes[] = {
 191       GL_UNSIGNED_BYTE,
 192   };
 193   static const GLenum kLuminanceAlphaTypes[] = {
 194       GL_UNSIGNED_BYTE,
 195   };
 196   static const FormatInfo kFormatTypes[] = {
 197     { GL_ALPHA, kAlphaTypes, arraysize(kAlphaTypes), },
 198     { GL_RGB, kRGBTypes, arraysize(kRGBTypes), },
 199     { GL_RGBA, kRGBATypes, arraysize(kRGBATypes), },
 200     { GL_LUMINANCE, kLuminanceTypes, arraysize(kLuminanceTypes), },
 201     { GL_LUMINANCE_ALPHA, kLuminanceAlphaTypes,
 202       arraysize(kLuminanceAlphaTypes), } ,
 203   };
 204   for (size_t ii = 0; ii < arraysize(kFormatTypes); ++ii) {
 205     const FormatInfo& info = kFormatTypes[ii];
 206     ValueValidator<GLenum>& validator = texture_format_validators_[info.format];
 207     for (size_t jj = 0; jj < info.count; ++jj) {
 208       validator.AddValue(info.types[jj]);
 209     }
 210   }
 211 }
 212
 213 bool FeatureInfo::Initialize() {
 214   disallowed_features_ = DisallowedFeatures();
 215   InitializeFeatures();
 216   return true;
 217 }
 218
 219 bool FeatureInfo::Initialize(const DisallowedFeatures& disallowed_features) {
 220   disallowed_features_ = disallowed_features;
 221   InitializeFeatures();
 222   return true;
 223 }
 224
 225 void FeatureInfo::InitializeFeatures() {
 226   // Figure out what extensions to turn on.
 227   StringSet extensions(
 228       reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS)));
 229
 230   bool npot_ok = false;
 231
 232   const char* renderer_str =
 233       reinterpret_cast<const char*>(glGetString(GL_RENDERER));
 234   if (renderer_str) {
 235     feature_flags_.is_angle = StartsWithASCII(renderer_str, "ANGLE", true);
 236   }
 237
 238   bool is_es3 = false;
 239   const char* version_str =
 240       reinterpret_cast<const char*>(glGetString(GL_VERSION));
 241   if (version_str) {
 242     std::string lstr(StringToLowerASCII(std::string(version_str)));
 243     is_es3 = (lstr.substr(0, 12) == "opengl es 3.");
 244   }
 245
 246   AddExtensionString("GL_ANGLE_translated_shader_source");
 247   AddExtensionString("GL_CHROMIUM_async_pixel_transfers");
 248   AddExtensionString("GL_CHROMIUM_bind_uniform_location");
 249   AddExtensionString("GL_CHROMIUM_command_buffer_query");
 250   AddExtensionString("GL_CHROMIUM_command_buffer_latency_query");
 251   AddExtensionString("GL_CHROMIUM_copy_texture");
 252   AddExtensionString("GL_CHROMIUM_get_error_query");
 253   AddExtensionString("GL_CHROMIUM_lose_context");
 254   AddExtensionString("GL_CHROMIUM_pixel_transfer_buffer_object");
 255   AddExtensionString("GL_CHROMIUM_rate_limit_offscreen_context");
 256   AddExtensionString("GL_CHROMIUM_resize");
 257   AddExtensionString("GL_CHROMIUM_resource_safe");
 258   AddExtensionString("GL_CHROMIUM_strict_attribs");
 259   AddExtensionString("GL_CHROMIUM_texture_mailbox");
 260   AddExtensionString("GL_EXT_debug_marker");
 261
 262   // OES_vertex_array_object is emulated if not present natively,
 263   // so the extension string is always exposed.
 264   AddExtensionString("GL_OES_vertex_array_object");
 265
 266   if (!disallowed_features_.gpu_memory_manager)
 267     AddExtensionString("GL_CHROMIUM_gpu_memory_manager");
 268
 269   if (extensions.Contains("GL_ANGLE_translated_shader_source")) {
 270     feature_flags_.angle_translated_shader_source = true;
 271   }
 272
 273   // Check if we should allow GL_EXT_texture_compression_dxt1 and
 274   // GL_EXT_texture_compression_s3tc.
 275   bool enable_dxt1 = false;
 276   bool enable_dxt3 = false;
 277   bool enable_dxt5 = false;
 278   bool have_s3tc = extensions.Contains("GL_EXT_texture_compression_s3tc");
 279   bool have_dxt3 =
 280       have_s3tc || extensions.Contains("GL_ANGLE_texture_compression_dxt3");
 281   bool have_dxt5 =
 282       have_s3tc || extensions.Contains("GL_ANGLE_texture_compression_dxt5");
 283
 284   if (extensions.Contains("GL_EXT_texture_compression_dxt1") || have_s3tc) {
 285     enable_dxt1 = true;
 286   }
 287   if (have_dxt3) {
 288     enable_dxt3 = true;
 289   }
 290   if (have_dxt5) {
 291     enable_dxt5 = true;
 292   }
 293
 294   if (enable_dxt1) {
 295     AddExtensionString("GL_EXT_texture_compression_dxt1");
 296     validators_.compressed_texture_format.AddValue(
 297         GL_COMPRESSED_RGB_S3TC_DXT1_EXT);
 298     validators_.compressed_texture_format.AddValue(
 299         GL_COMPRESSED_RGBA_S3TC_DXT1_EXT);
 300   }
 301
 302   if (enable_dxt3) {
 303     // The difference between GL_EXT_texture_compression_s3tc and
 304     // GL_CHROMIUM_texture_compression_dxt3 is that the former
 305     // requires on the fly compression. The latter does not.
 306     AddExtensionString("GL_CHROMIUM_texture_compression_dxt3");
 307     validators_.compressed_texture_format.AddValue(
 308         GL_COMPRESSED_RGBA_S3TC_DXT3_EXT);
 309   }
 310
 311   if (enable_dxt5) {
 312     // The difference between GL_EXT_texture_compression_s3tc and
 313     // GL_CHROMIUM_texture_compression_dxt5 is that the former
 314     // requires on the fly compression. The latter does not.
 315     AddExtensionString("GL_CHROMIUM_texture_compression_dxt5");
 316     validators_.compressed_texture_format.AddValue(
 317         GL_COMPRESSED_RGBA_S3TC_DXT5_EXT);
 318   }
 319
 320   // Check if we should enable GL_EXT_texture_filter_anisotropic.
 321   if (extensions.Contains("GL_EXT_texture_filter_anisotropic")) {
 322     AddExtensionString("GL_EXT_texture_filter_anisotropic");
 323     validators_.texture_parameter.AddValue(
 324         GL_TEXTURE_MAX_ANISOTROPY_EXT);
 325     validators_.g_l_state.AddValue(
 326         GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT);
 327   }
 328
 329   // Check if we should support GL_OES_packed_depth_stencil and/or
 330   // GL_GOOGLE_depth_texture / GL_CHROMIUM_depth_texture.
 331   //
 332   // NOTE: GL_OES_depth_texture requires support for depth cubemaps.
 333   // GL_ARB_depth_texture requires other features that
 334   // GL_OES_packed_depth_stencil does not provide.
 335   //
 336   // Therefore we made up GL_GOOGLE_depth_texture / GL_CHROMIUM_depth_texture.
 337   //
 338   // GL_GOOGLE_depth_texture is legacy. As we exposed it into NaCl we can't
 339   // get rid of it.
 340   //
 341   bool enable_depth_texture = false;
 342   if (!workarounds_.disable_depth_texture &&
 343       (extensions.Contains("GL_ARB_depth_texture") ||
 344        extensions.Contains("GL_OES_depth_texture") ||
 345        extensions.Contains("GL_ANGLE_depth_texture") || is_es3)) {
 346     enable_depth_texture = true;
 347     feature_flags_.angle_depth_texture =
 348         extensions.Contains("GL_ANGLE_depth_texture");
 349   }
 350
 351   if (enable_depth_texture) {
 352     AddExtensionString("GL_CHROMIUM_depth_texture");
 353     AddExtensionString("GL_GOOGLE_depth_texture");
 354     texture_format_validators_[GL_DEPTH_COMPONENT].AddValue(GL_UNSIGNED_SHORT);
 355     texture_format_validators_[GL_DEPTH_COMPONENT].AddValue(GL_UNSIGNED_INT);
 356     validators_.texture_internal_format.AddValue(GL_DEPTH_COMPONENT);
 357     validators_.texture_format.AddValue(GL_DEPTH_COMPONENT);
 358     validators_.pixel_type.AddValue(GL_UNSIGNED_SHORT);
 359     validators_.pixel_type.AddValue(GL_UNSIGNED_INT);
 360   }
 361
 362   if (extensions.Contains("GL_EXT_packed_depth_stencil") ||
 363       extensions.Contains("GL_OES_packed_depth_stencil") || is_es3) {
 364     AddExtensionString("GL_OES_packed_depth_stencil");
 365     feature_flags_.packed_depth24_stencil8 = true;
 366     if (enable_depth_texture) {
 367       texture_format_validators_[GL_DEPTH_STENCIL]
 368           .AddValue(GL_UNSIGNED_INT_24_8);
 369       validators_.texture_internal_format.AddValue(GL_DEPTH_STENCIL);
 370       validators_.texture_format.AddValue(GL_DEPTH_STENCIL);
 371       validators_.pixel_type.AddValue(GL_UNSIGNED_INT_24_8);
 372     }
 373     validators_.render_buffer_format.AddValue(GL_DEPTH24_STENCIL8);
 374   }
 375
 376   if (extensions.Contains("GL_OES_vertex_array_object") ||
 377       extensions.Contains("GL_ARB_vertex_array_object") ||
 378       extensions.Contains("GL_APPLE_vertex_array_object")) {
 379     feature_flags_.native_vertex_array_object = true;
 380   }
 381
 382   // If we're using client_side_arrays we have to emulate
 383   // vertex array objects since vertex array objects do not work
 384   // with client side arrays.
 385   if (workarounds_.use_client_side_arrays_for_stream_buffers) {
 386     feature_flags_.native_vertex_array_object = false;
 387   }
 388
 389   if (extensions.Contains("GL_OES_element_index_uint") ||
 390       gfx::HasDesktopGLFeatures()) {
 391     AddExtensionString("GL_OES_element_index_uint");
 392     validators_.index_type.AddValue(GL_UNSIGNED_INT);
 393   }
 394
 395   bool enable_texture_format_bgra8888 = false;
 396   bool enable_read_format_bgra = false;
 397   bool enable_render_buffer_bgra = false;
 398
 399   // Check if we should allow GL_EXT_texture_format_BGRA8888
 400   if (extensions.Contains("GL_EXT_texture_format_BGRA8888") ||
 401       extensions.Contains("GL_APPLE_texture_format_BGRA8888") ||
 402       extensions.Contains("GL_EXT_bgra")) {
 403     enable_texture_format_bgra8888 = true;
 404   }
 405
 406   if (extensions.Contains("GL_EXT_bgra")) {
 407     enable_render_buffer_bgra = true;
 408   }
 409
 410   if (extensions.Contains("GL_EXT_read_format_bgra") ||
 411       extensions.Contains("GL_EXT_bgra")) {
 412     enable_read_format_bgra = true;
 413   }
 414
 415   if (enable_texture_format_bgra8888) {
 416     feature_flags_.ext_texture_format_bgra8888 = true;
 417     AddExtensionString("GL_EXT_texture_format_BGRA8888");
 418     texture_format_validators_[GL_BGRA_EXT].AddValue(GL_UNSIGNED_BYTE);
 419     validators_.texture_internal_format.AddValue(GL_BGRA_EXT);
 420     validators_.texture_format.AddValue(GL_BGRA_EXT);
 421   }
 422
 423   if (enable_read_format_bgra) {
 424     AddExtensionString("GL_EXT_read_format_bgra");
 425     validators_.read_pixel_format.AddValue(GL_BGRA_EXT);
 426   }
 427
 428   if (enable_render_buffer_bgra) {
 429     AddExtensionString("GL_CHROMIUM_renderbuffer_format_BGRA8888");
 430     validators_.render_buffer_format.AddValue(GL_BGRA8_EXT);
 431   }
 432
 433   if (extensions.Contains("GL_OES_rgb8_rgba8") || gfx::HasDesktopGLFeatures()) {
 434     AddExtensionString("GL_OES_rgb8_rgba8");
 435     validators_.render_buffer_format.AddValue(GL_RGB8_OES);
 436     validators_.render_buffer_format.AddValue(GL_RGBA8_OES);
 437   }
 438
 439   // Check if we should allow GL_OES_texture_npot
 440   if (extensions.Contains("GL_ARB_texture_non_power_of_two") ||
 441       extensions.Contains("GL_OES_texture_npot")) {
 442     AddExtensionString("GL_OES_texture_npot");
 443     npot_ok = true;
 444   }
 445
 446   // Check if we should allow GL_OES_texture_float, GL_OES_texture_half_float,
 447   // GL_OES_texture_float_linear, GL_OES_texture_half_float_linear
 448   bool enable_texture_float = false;
 449   bool enable_texture_float_linear = false;
 450   bool enable_texture_half_float = false;
 451   bool enable_texture_half_float_linear = false;
 452
 453   bool may_enable_chromium_color_buffer_float = false;
 454
 455   if (extensions.Contains("GL_ARB_texture_float")) {
 456     enable_texture_float = true;
 457     enable_texture_float_linear = true;
 458     enable_texture_half_float = true;
 459     enable_texture_half_float_linear = true;
 460     may_enable_chromium_color_buffer_float = true;
 461   } else {
 462     if (extensions.Contains("GL_OES_texture_float")) {
 463       enable_texture_float = true;
 464       if (extensions.Contains("GL_OES_texture_float_linear")) {
 465         enable_texture_float_linear = true;
 466       }
 467       if ((is_es3 && extensions.Contains("GL_EXT_color_buffer_float")) ||
 468           feature_flags_.is_angle) {
 469         may_enable_chromium_color_buffer_float = true;
 470       }
 471     }
 472     if (extensions.Contains("GL_OES_texture_half_float")) {
 473       enable_texture_half_float = true;
 474       if (extensions.Contains("GL_OES_texture_half_float_linear")) {
 475         enable_texture_half_float_linear = true;
 476       }
 477     }
 478   }
 479
 480   if (enable_texture_float) {
 481     texture_format_validators_[GL_ALPHA].AddValue(GL_FLOAT);
 482     texture_format_validators_[GL_RGB].AddValue(GL_FLOAT);
 483     texture_format_validators_[GL_RGBA].AddValue(GL_FLOAT);
 484     texture_format_validators_[GL_LUMINANCE].AddValue(GL_FLOAT);
 485     texture_format_validators_[GL_LUMINANCE_ALPHA].AddValue(GL_FLOAT);
 486     validators_.pixel_type.AddValue(GL_FLOAT);
 487     validators_.read_pixel_type.AddValue(GL_FLOAT);
 488     AddExtensionString("GL_OES_texture_float");
 489     if (enable_texture_float_linear) {
 490       AddExtensionString("GL_OES_texture_float_linear");
 491     }
 492   }
 493
 494   if (enable_texture_half_float) {
 495     texture_format_validators_[GL_ALPHA].AddValue(GL_HALF_FLOAT_OES);
 496     texture_format_validators_[GL_RGB].AddValue(GL_HALF_FLOAT_OES);
 497     texture_format_validators_[GL_RGBA].AddValue(GL_HALF_FLOAT_OES);
 498     texture_format_validators_[GL_LUMINANCE].AddValue(GL_HALF_FLOAT_OES);
 499     texture_format_validators_[GL_LUMINANCE_ALPHA].AddValue(GL_HALF_FLOAT_OES);
 500     validators_.pixel_type.AddValue(GL_HALF_FLOAT_OES);
 501     validators_.read_pixel_type.AddValue(GL_HALF_FLOAT_OES);
 502     AddExtensionString("GL_OES_texture_half_float");
 503     if (enable_texture_half_float_linear) {
 504       AddExtensionString("GL_OES_texture_half_float_linear");
 505     }
 506   }
 507
 508   if (may_enable_chromium_color_buffer_float) {
 509     COMPILE_ASSERT(GL_RGBA32F_ARB == GL_RGBA32F &&
 510                    GL_RGBA32F_EXT == GL_RGBA32F &&
 511                    GL_RGB32F_ARB == GL_RGB32F &&
 512                    GL_RGB32F_EXT == GL_RGB32F,
 513                    sized_float_internal_format_variations_must_match);
 514     // We don't check extension support beyond ARB_texture_float on desktop GL,
 515     // and format support varies between GL configurations. For example, spec
 516     // prior to OpenGL 3.0 mandates framebuffer support only for one
 517     // implementation-chosen format, and ES3.0 EXT_color_buffer_float does not
 518     // support rendering to RGB32F. Check for framebuffer completeness with
 519     // formats that the extensions expose, and only enable an extension when a
 520     // framebuffer created with its texture format is reported as complete.
 521     GLint fb_binding = 0;
 522     GLint tex_binding = 0;
 523     glGetIntegerv(GL_FRAMEBUFFER_BINDING, &fb_binding);
 524     glGetIntegerv(GL_TEXTURE_BINDING_2D, &tex_binding);
 525
 526     GLuint tex_id = 0;
 527     GLuint fb_id = 0;
 528     GLsizei width = 16;
 529
 530     glGenTextures(1, &tex_id);
 531     glGenFramebuffersEXT(1, &fb_id);
 532     glBindTexture(GL_TEXTURE_2D, tex_id);
 533     // Nearest filter needed for framebuffer completeness on some drivers.
 534     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 535     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, width, width, 0, GL_RGBA,
 536                  GL_FLOAT, NULL);
 537     glBindFramebufferEXT(GL_FRAMEBUFFER, fb_id);
 538     glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 539                               GL_TEXTURE_2D, tex_id, 0);
 540     GLenum statusRGBA = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
 541     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32F, width, width, 0, GL_RGB,
 542                  GL_FLOAT, NULL);
 543     GLenum statusRGB = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
 544     glDeleteFramebuffersEXT(1, &fb_id);
 545     glDeleteTextures(1, &tex_id);
 546
 547     glBindFramebufferEXT(GL_FRAMEBUFFER, static_cast<GLuint>(fb_binding));
 548     glBindTexture(GL_TEXTURE_2D, static_cast<GLuint>(tex_binding));
 549
 550     DCHECK(glGetError() == GL_NO_ERROR);
 551
 552     if (statusRGBA == GL_FRAMEBUFFER_COMPLETE) {
 553       validators_.texture_internal_format.AddValue(GL_RGBA32F);
 554       feature_flags_.chromium_color_buffer_float_rgba = true;
 555       AddExtensionString("GL_CHROMIUM_color_buffer_float_rgba");
 556     }
 557     if (statusRGB == GL_FRAMEBUFFER_COMPLETE) {
 558       validators_.texture_internal_format.AddValue(GL_RGB32F);
 559       feature_flags_.chromium_color_buffer_float_rgb = true;
 560       AddExtensionString("GL_CHROMIUM_color_buffer_float_rgb");
 561     }
 562   }
 563
 564   // Check for multisample support
 565   if (!workarounds_.disable_multisampling) {
 566     bool ext_has_multisample =
 567         extensions.Contains("GL_EXT_framebuffer_multisample") || is_es3;
 568     if (feature_flags_.is_angle) {
 569       ext_has_multisample |=
 570           extensions.Contains("GL_ANGLE_framebuffer_multisample");
 571     }
 572     feature_flags_.use_core_framebuffer_multisample = is_es3;
 573     if (ext_has_multisample) {
 574       feature_flags_.chromium_framebuffer_multisample = true;
 575       validators_.frame_buffer_target.AddValue(GL_READ_FRAMEBUFFER_EXT);
 576       validators_.frame_buffer_target.AddValue(GL_DRAW_FRAMEBUFFER_EXT);
 577       validators_.g_l_state.AddValue(GL_READ_FRAMEBUFFER_BINDING_EXT);
 578       validators_.g_l_state.AddValue(GL_MAX_SAMPLES_EXT);
 579       validators_.render_buffer_parameter.AddValue(GL_RENDERBUFFER_SAMPLES_EXT);
 580       AddExtensionString("GL_CHROMIUM_framebuffer_multisample");
 581     }
 582     if (extensions.Contains("GL_EXT_multisampled_render_to_texture")) {
 583       feature_flags_.multisampled_render_to_texture = true;
 584     } else if (extensions.Contains("GL_IMG_multisampled_render_to_texture")) {
 585       feature_flags_.multisampled_render_to_texture = true;
 586       feature_flags_.use_img_for_multisampled_render_to_texture = true;
 587     }
 588     if (feature_flags_.multisampled_render_to_texture) {
 589       validators_.render_buffer_parameter.AddValue(
 590           GL_RENDERBUFFER_SAMPLES_EXT);
 591       validators_.g_l_state.AddValue(GL_MAX_SAMPLES_EXT);
 592       validators_.frame_buffer_parameter.AddValue(
 593           GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT);
 594       AddExtensionString("GL_EXT_multisampled_render_to_texture");
 595     }
 596   }
 597
 598   if (extensions.Contains("GL_OES_depth24") || gfx::HasDesktopGLFeatures() ||
 599       is_es3) {
 600     AddExtensionString("GL_OES_depth24");
 601     feature_flags_.oes_depth24 = true;
 602     validators_.render_buffer_format.AddValue(GL_DEPTH_COMPONENT24);
 603   }
 604
 605   if (!workarounds_.disable_oes_standard_derivatives &&
 606       (extensions.Contains("GL_OES_standard_derivatives") ||
 607        gfx::HasDesktopGLFeatures())) {
 608     AddExtensionString("GL_OES_standard_derivatives");
 609     feature_flags_.oes_standard_derivatives = true;
 610     validators_.hint_target.AddValue(GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES);
 611     validators_.g_l_state.AddValue(GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES);
 612   }
 613
 614   if (extensions.Contains("GL_OES_EGL_image_external")) {
 615     AddExtensionString("GL_OES_EGL_image_external");
 616     feature_flags_.oes_egl_image_external = true;
 617     validators_.texture_bind_target.AddValue(GL_TEXTURE_EXTERNAL_OES);
 618     validators_.get_tex_param_target.AddValue(GL_TEXTURE_EXTERNAL_OES);
 619     validators_.texture_parameter.AddValue(GL_REQUIRED_TEXTURE_IMAGE_UNITS_OES);
 620     validators_.g_l_state.AddValue(GL_TEXTURE_BINDING_EXTERNAL_OES);
 621   }
 622
 623   if (extensions.Contains("GL_OES_compressed_ETC1_RGB8_texture")) {
 624     AddExtensionString("GL_OES_compressed_ETC1_RGB8_texture");
 625     feature_flags_.oes_compressed_etc1_rgb8_texture = true;
 626     validators_.compressed_texture_format.AddValue(GL_ETC1_RGB8_OES);
 627   }
 628
 629   if (extensions.Contains("GL_AMD_compressed_ATC_texture")) {
 630     AddExtensionString("GL_AMD_compressed_ATC_texture");
 631     validators_.compressed_texture_format.AddValue(
 632         GL_ATC_RGB_AMD);
 633     validators_.compressed_texture_format.AddValue(
 634         GL_ATC_RGBA_EXPLICIT_ALPHA_AMD);
 635     validators_.compressed_texture_format.AddValue(
 636         GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD);
 637   }
 638
 639   if (extensions.Contains("GL_IMG_texture_compression_pvrtc")) {
 640     AddExtensionString("GL_IMG_texture_compression_pvrtc");
 641     validators_.compressed_texture_format.AddValue(
 642         GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG);
 643     validators_.compressed_texture_format.AddValue(
 644         GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG);
 645     validators_.compressed_texture_format.AddValue(
 646         GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG);
 647     validators_.compressed_texture_format.AddValue(
 648         GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG);
 649   }
 650
 651   // Ideally we would only expose this extension on Mac OS X, to
 652   // support GL_CHROMIUM_iosurface and the compositor. We don't want
 653   // applications to start using it; they should use ordinary non-
 654   // power-of-two textures. However, for unit testing purposes we
 655   // expose it on all supported platforms.
 656   if (extensions.Contains("GL_ARB_texture_rectangle")) {
 657     AddExtensionString("GL_ARB_texture_rectangle");
 658     feature_flags_.arb_texture_rectangle = true;
 659     validators_.texture_bind_target.AddValue(GL_TEXTURE_RECTANGLE_ARB);
 660     // For the moment we don't add this enum to the texture_target
 661     // validator. This implies that the only way to get image data into a
 662     // rectangular texture is via glTexImageIOSurface2DCHROMIUM, which is
 663     // just fine since again we don't want applications depending on this
 664     // extension.
 665     validators_.get_tex_param_target.AddValue(GL_TEXTURE_RECTANGLE_ARB);
 666     validators_.g_l_state.AddValue(GL_TEXTURE_BINDING_RECTANGLE_ARB);
 667   }
 668
 669 #if defined(OS_MACOSX)
 670   AddExtensionString("GL_CHROMIUM_iosurface");
 671 #endif
 672
 673   // TODO(gman): Add support for these extensions.
 674   //     GL_OES_depth32
 675
 676   feature_flags_.enable_texture_float_linear |= enable_texture_float_linear;
 677   feature_flags_.enable_texture_half_float_linear |=
 678       enable_texture_half_float_linear;
 679   feature_flags_.npot_ok |= npot_ok;
 680
 681   if (extensions.Contains("GL_ANGLE_pack_reverse_row_order")) {
 682     AddExtensionString("GL_ANGLE_pack_reverse_row_order");
 683     feature_flags_.angle_pack_reverse_row_order = true;
 684     validators_.pixel_store.AddValue(GL_PACK_REVERSE_ROW_ORDER_ANGLE);
 685     validators_.g_l_state.AddValue(GL_PACK_REVERSE_ROW_ORDER_ANGLE);
 686   }
 687
 688   if (extensions.Contains("GL_ANGLE_texture_usage")) {
 689     feature_flags_.angle_texture_usage = true;
 690     AddExtensionString("GL_ANGLE_texture_usage");
 691     validators_.texture_parameter.AddValue(GL_TEXTURE_USAGE_ANGLE);
 692   }
 693
 694   if (extensions.Contains("GL_EXT_texture_storage")) {
 695     feature_flags_.ext_texture_storage = true;
 696     AddExtensionString("GL_EXT_texture_storage");
 697     validators_.texture_parameter.AddValue(GL_TEXTURE_IMMUTABLE_FORMAT_EXT);
 698     if (enable_texture_format_bgra8888)
 699         validators_.texture_internal_format_storage.AddValue(GL_BGRA8_EXT);
 700     if (enable_texture_float) {
 701         validators_.texture_internal_format_storage.AddValue(GL_RGBA32F_EXT);
 702         validators_.texture_internal_format_storage.AddValue(GL_RGB32F_EXT);
 703         validators_.texture_internal_format_storage.AddValue(GL_ALPHA32F_EXT);
 704         validators_.texture_internal_format_storage.AddValue(
 705             GL_LUMINANCE32F_EXT);
 706         validators_.texture_internal_format_storage.AddValue(
 707             GL_LUMINANCE_ALPHA32F_EXT);
 708     }
 709     if (enable_texture_half_float) {
 710         validators_.texture_internal_format_storage.AddValue(GL_RGBA16F_EXT);
 711         validators_.texture_internal_format_storage.AddValue(GL_RGB16F_EXT);
 712         validators_.texture_internal_format_storage.AddValue(GL_ALPHA16F_EXT);
 713         validators_.texture_internal_format_storage.AddValue(
 714             GL_LUMINANCE16F_EXT);
 715         validators_.texture_internal_format_storage.AddValue(
 716             GL_LUMINANCE_ALPHA16F_EXT);
 717     }
 718   }
 719
 720   bool have_ext_occlusion_query_boolean =
 721       extensions.Contains("GL_EXT_occlusion_query_boolean");
 722   bool have_arb_occlusion_query2 =
 723       extensions.Contains("GL_ARB_occlusion_query2");
 724   bool have_arb_occlusion_query =
 725       extensions.Contains("GL_ARB_occlusion_query");
 726
 727   if (!workarounds_.disable_ext_occlusion_query &&
 728       (have_ext_occlusion_query_boolean ||
 729        have_arb_occlusion_query2 ||
 730        have_arb_occlusion_query)) {
 731     AddExtensionString("GL_EXT_occlusion_query_boolean");
 732     feature_flags_.occlusion_query_boolean = true;
 733     feature_flags_.use_arb_occlusion_query2_for_occlusion_query_boolean =
 734         !have_ext_occlusion_query_boolean && have_arb_occlusion_query2;
 735     feature_flags_.use_arb_occlusion_query_for_occlusion_query_boolean =
 736         !have_ext_occlusion_query_boolean && have_arb_occlusion_query &&
 737         !have_arb_occlusion_query2;
 738   }
 739
 740   if (!workarounds_.disable_angle_instanced_arrays &&
 741       (extensions.Contains("GL_ANGLE_instanced_arrays") ||
 742        (extensions.Contains("GL_ARB_instanced_arrays") &&
 743         extensions.Contains("GL_ARB_draw_instanced")) ||
 744        is_es3)) {
 745     AddExtensionString("GL_ANGLE_instanced_arrays");
 746     feature_flags_.angle_instanced_arrays = true;
 747     validators_.vertex_attribute.AddValue(GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE);
 748   }
 749
 750   if (!workarounds_.disable_ext_draw_buffers &&
 751       (extensions.Contains("GL_ARB_draw_buffers") ||
 752        extensions.Contains("GL_EXT_draw_buffers"))) {
 753     AddExtensionString("GL_EXT_draw_buffers");
 754     feature_flags_.ext_draw_buffers = true;
 755
 756     GLint max_color_attachments = 0;
 757     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &max_color_attachments);
 758     for (GLenum i = GL_COLOR_ATTACHMENT1_EXT;
 759          i < static_cast<GLenum>(GL_COLOR_ATTACHMENT0 + max_color_attachments);
 760          ++i) {
 761       validators_.attachment.AddValue(i);
 762     }
 763
 764     validators_.g_l_state.AddValue(GL_MAX_COLOR_ATTACHMENTS_EXT);
 765     validators_.g_l_state.AddValue(GL_MAX_DRAW_BUFFERS_ARB);
 766     GLint max_draw_buffers = 0;
 767     glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_draw_buffers);
 768     for (GLenum i = GL_DRAW_BUFFER0_ARB;
 769          i < static_cast<GLenum>(GL_DRAW_BUFFER0_ARB + max_draw_buffers);
 770          ++i) {
 771       validators_.g_l_state.AddValue(i);
 772     }
 773   }
 774
 775   if (extensions.Contains("GL_EXT_blend_minmax") ||
 776       gfx::HasDesktopGLFeatures()) {
 777     AddExtensionString("GL_EXT_blend_minmax");
 778     validators_.equation.AddValue(GL_MIN_EXT);
 779     validators_.equation.AddValue(GL_MAX_EXT);
 780   }
 781
 782   if (extensions.Contains("GL_EXT_frag_depth") || gfx::HasDesktopGLFeatures()) {
 783     AddExtensionString("GL_EXT_frag_depth");
 784     feature_flags_.ext_frag_depth = true;
 785   }
 786
 787   if (extensions.Contains("GL_EXT_shader_texture_lod") ||
 788       gfx::HasDesktopGLFeatures()) {
 789     AddExtensionString("GL_EXT_shader_texture_lod");
 790     feature_flags_.ext_shader_texture_lod = true;
 791   }
 792
 793 #if !defined(OS_MACOSX)
 794   if (workarounds_.disable_egl_khr_fence_sync) {
 795     gfx::g_driver_egl.ext.b_EGL_KHR_fence_sync = false;
 796   }
 797 #endif
 798   if (workarounds_.disable_arb_sync)
 799     gfx::g_driver_gl.ext.b_GL_ARB_sync = false;
 800   bool ui_gl_fence_works = gfx::GLFence::IsSupported();
 801   UMA_HISTOGRAM_BOOLEAN("GPU.FenceSupport", ui_gl_fence_works);
 802
 803   feature_flags_.map_buffer_range =
 804       is_es3 || extensions.Contains("GL_ARB_map_buffer_range");
 805
 806   // Really it's part of core OpenGL 2.1 and up, but let's assume the
 807   // extension is still advertised.
 808   bool has_pixel_buffers =
 809       is_es3 || extensions.Contains("GL_ARB_pixel_buffer_object");
 810
 811   // We will use either glMapBuffer() or glMapBufferRange() for async readbacks.
 812   if (has_pixel_buffers && ui_gl_fence_works &&
 813       !workarounds_.disable_async_readpixels) {
 814     feature_flags_.use_async_readpixels = true;
 815   }
 816
 817   if (is_es3 || extensions.Contains("GL_ARB_sampler_objects")) {
 818     feature_flags_.enable_samplers = true;
 819     // TODO(dsinclair): Add AddExtensionString("GL_CHROMIUM_sampler_objects")
 820     // when available.
 821   }
 822
 823   if ((is_es3 || extensions.Contains("GL_EXT_discard_framebuffer")) &&
 824       !workarounds_.disable_ext_discard_framebuffer) {
 825     // DiscardFramebufferEXT is automatically bound to InvalidateFramebuffer.
 826     AddExtensionString("GL_EXT_discard_framebuffer");
 827     feature_flags_.ext_discard_framebuffer = true;
 828   }
 829
 830   if (ui_gl_fence_works) {
 831     AddExtensionString("GL_CHROMIUM_sync_query");
 832     feature_flags_.chromium_sync_query = true;
 833   }
 834 }
 835
 836 void FeatureInfo::AddExtensionString(const std::string& str) {
 837   size_t pos = extensions_.find(str);
 838   while (pos != std::string::npos &&
 839          pos + str.length() < extensions_.length() &&
 840          extensions_.substr(pos + str.length(), 1) != " ") {
 841     // This extension name is a substring of another.
 842     pos = extensions_.find(str, pos + str.length());
 843   }
 844   if (pos == std::string::npos) {
 845     extensions_ += (extensions_.empty() ? "" : " ") + str;
 846   }
 847 }
 848
 849 FeatureInfo::~FeatureInfo() {
 850 }
 851
 852 }  // namespace gles2
 853 }  // namespace gpu