dom/canvas/WebGLContextExtensions.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "WebGLContext.h"
   7 #include "ClientWebGLExtensions.h"
   8 #include "GLContext.h"
   9 #include "mozilla/dom/BindingDeclarations.h"
  10 #include "mozilla/dom/ToJSValue.h"
  11 #include "mozilla/EnumeratedRange.h"
  12 #include "mozilla/StaticPrefs_webgl.h"
  13 #include "nsString.h"
  14 #include "WebGLContextUtils.h"
  15 #include "WebGLExtensions.h"
  16
  17 namespace mozilla {
  18
  19 const char* GetExtensionName(const WebGLExtensionID ext) {
  20   switch (ext) {
  21 #define WEBGL_EXTENSION_IDENTIFIER(x) \
  22   case WebGLExtensionID::x:           \
  23     return #x;
  24
  25     WEBGL_EXTENSION_IDENTIFIER(ANGLE_instanced_arrays)
  26     WEBGL_EXTENSION_IDENTIFIER(EXT_blend_minmax)
  27     WEBGL_EXTENSION_IDENTIFIER(EXT_color_buffer_float)
  28     WEBGL_EXTENSION_IDENTIFIER(EXT_color_buffer_half_float)
  29     WEBGL_EXTENSION_IDENTIFIER(EXT_depth_clamp)
  30     WEBGL_EXTENSION_IDENTIFIER(EXT_disjoint_timer_query)
  31     WEBGL_EXTENSION_IDENTIFIER(EXT_float_blend)
  32     WEBGL_EXTENSION_IDENTIFIER(EXT_frag_depth)
  33     WEBGL_EXTENSION_IDENTIFIER(EXT_shader_texture_lod)
  34     WEBGL_EXTENSION_IDENTIFIER(EXT_sRGB)
  35     WEBGL_EXTENSION_IDENTIFIER(EXT_texture_compression_bptc)
  36     WEBGL_EXTENSION_IDENTIFIER(EXT_texture_compression_rgtc)
  37     WEBGL_EXTENSION_IDENTIFIER(EXT_texture_filter_anisotropic)
  38     WEBGL_EXTENSION_IDENTIFIER(EXT_texture_norm16)
  39     WEBGL_EXTENSION_IDENTIFIER(MOZ_debug)
  40     WEBGL_EXTENSION_IDENTIFIER(OES_draw_buffers_indexed)
  41     WEBGL_EXTENSION_IDENTIFIER(OES_element_index_uint)
  42     WEBGL_EXTENSION_IDENTIFIER(OES_fbo_render_mipmap)
  43     WEBGL_EXTENSION_IDENTIFIER(OES_standard_derivatives)
  44     WEBGL_EXTENSION_IDENTIFIER(OES_texture_float)
  45     WEBGL_EXTENSION_IDENTIFIER(OES_texture_float_linear)
  46     WEBGL_EXTENSION_IDENTIFIER(OES_texture_half_float)
  47     WEBGL_EXTENSION_IDENTIFIER(OES_texture_half_float_linear)
  48     WEBGL_EXTENSION_IDENTIFIER(OES_vertex_array_object)
  49     WEBGL_EXTENSION_IDENTIFIER(OVR_multiview2)
  50     WEBGL_EXTENSION_IDENTIFIER(WEBGL_color_buffer_float)
  51     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_astc)
  52     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_etc)
  53     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_etc1)
  54     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_pvrtc)
  55     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_s3tc)
  56     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_s3tc_srgb)
  57     WEBGL_EXTENSION_IDENTIFIER(WEBGL_debug_renderer_info)
  58     WEBGL_EXTENSION_IDENTIFIER(WEBGL_debug_shaders)
  59     WEBGL_EXTENSION_IDENTIFIER(WEBGL_depth_texture)
  60     WEBGL_EXTENSION_IDENTIFIER(WEBGL_draw_buffers)
  61     WEBGL_EXTENSION_IDENTIFIER(WEBGL_explicit_present)
  62     WEBGL_EXTENSION_IDENTIFIER(WEBGL_lose_context)
  63     WEBGL_EXTENSION_IDENTIFIER(WEBGL_provoking_vertex)
  64
  65 #undef WEBGL_EXTENSION_IDENTIFIER
  66
  67     case WebGLExtensionID::Max:
  68       break;
  69   }
  70   MOZ_CRASH("bad WebGLExtensionID");
  71 }
  72
  73 // ----------------------------
  74 // ClientWebGLContext
  75
  76 void ClientWebGLContext::GetExtension(JSContext* cx, const nsAString& wideName,
  77                                       JS::MutableHandle<JSObject*> retval,
  78                                       dom::CallerType callerType,
  79                                       ErrorResult& rv) {
  80   retval.set(nullptr);
  81   const FuncScope funcScope(*this, "getExtension");
  82   if (IsContextLost()) return;
  83
  84   const auto name = NS_ConvertUTF16toUTF8(wideName);
  85
  86   auto ext = WebGLExtensionID::Max;
  87
  88   // step 1: figure what extension is wanted
  89   for (const auto extension : MakeEnumeratedRange(WebGLExtensionID::Max)) {
  90     const auto& curName = GetExtensionName(extension);
  91     if (name.Equals(curName, nsCaseInsensitiveCStringComparator)) {
  92       ext = extension;
  93       break;
  94     }
  95   }
  96
  97   if (ext == WebGLExtensionID::Max) return;
  98
  99   RefPtr<ClientWebGLExtensionBase> extObj;
 100   if (ext == WebGLExtensionID::WEBGL_lose_context) {
 101     extObj = mExtLoseContext;
 102   } else {
 103     extObj = GetExtension(ext, callerType);
 104   }
 105   if (!extObj) return;
 106
 107   // Ugh, this would be easier returning `any` than `object`.
 108   JS::Rooted<JS::Value> v(cx);
 109   MOZ_ALWAYS_TRUE(dom::ToJSValue(cx, extObj, &v));
 110   if (v.isObject()) {
 111     retval.set(&v.toObject());
 112   }
 113 }
 114
 115 RefPtr<ClientWebGLExtensionBase> ClientWebGLContext::GetExtension(
 116     const WebGLExtensionID ext, const dom::CallerType callerType) {
 117   if (ext == WebGLExtensionID::WEBGL_lose_context) {
 118     // Always the same.
 119     return mExtLoseContext;
 120   }
 121
 122   if (!mNotLost) return nullptr;
 123
 124   if (!IsSupported(ext, callerType)) return nullptr;
 125
 126   auto& extSlot = mNotLost->extensions[UnderlyingValue(ext)];
 127   if (MOZ_UNLIKELY(!extSlot)) {
 128     extSlot = [&]() -> RefPtr<ClientWebGLExtensionBase> {
 129       switch (ext) {
 130         // ANGLE_
 131         case WebGLExtensionID::ANGLE_instanced_arrays:
 132           return new ClientWebGLExtensionInstancedArrays(*this);
 133
 134         // EXT_
 135         case WebGLExtensionID::EXT_blend_minmax:
 136           return new ClientWebGLExtensionBlendMinMax(*this);
 137         case WebGLExtensionID::EXT_color_buffer_float:
 138           return new ClientWebGLExtensionEXTColorBufferFloat(*this);
 139         case WebGLExtensionID::EXT_color_buffer_half_float:
 140           return new ClientWebGLExtensionColorBufferHalfFloat(*this);
 141         case WebGLExtensionID::EXT_depth_clamp:
 142           return new ClientWebGLExtensionDepthClamp(*this);
 143         case WebGLExtensionID::EXT_disjoint_timer_query:
 144           return new ClientWebGLExtensionDisjointTimerQuery(*this);
 145         case WebGLExtensionID::EXT_float_blend:
 146           return new ClientWebGLExtensionFloatBlend(*this);
 147         case WebGLExtensionID::EXT_frag_depth:
 148           return new ClientWebGLExtensionFragDepth(*this);
 149         case WebGLExtensionID::EXT_shader_texture_lod:
 150           return new ClientWebGLExtensionShaderTextureLod(*this);
 151         case WebGLExtensionID::EXT_sRGB:
 152           return new ClientWebGLExtensionSRGB(*this);
 153         case WebGLExtensionID::EXT_texture_compression_bptc:
 154           return new ClientWebGLExtensionCompressedTextureBPTC(*this);
 155         case WebGLExtensionID::EXT_texture_compression_rgtc:
 156           return new ClientWebGLExtensionCompressedTextureRGTC(*this);
 157         case WebGLExtensionID::EXT_texture_filter_anisotropic:
 158           return new ClientWebGLExtensionTextureFilterAnisotropic(*this);
 159         case WebGLExtensionID::EXT_texture_norm16:
 160           return new ClientWebGLExtensionTextureNorm16(*this);
 161
 162         // MOZ_
 163         case WebGLExtensionID::MOZ_debug:
 164           return new ClientWebGLExtensionMOZDebug(*this);
 165
 166         // OES_
 167         case WebGLExtensionID::OES_draw_buffers_indexed:
 168           return new ClientWebGLExtensionDrawBuffersIndexed(*this);
 169         case WebGLExtensionID::OES_element_index_uint:
 170           return new ClientWebGLExtensionElementIndexUint(*this);
 171         case WebGLExtensionID::OES_fbo_render_mipmap:
 172           return new ClientWebGLExtensionFBORenderMipmap(*this);
 173         case WebGLExtensionID::OES_standard_derivatives:
 174           return new ClientWebGLExtensionStandardDerivatives(*this);
 175         case WebGLExtensionID::OES_texture_float:
 176           return new ClientWebGLExtensionTextureFloat(*this);
 177         case WebGLExtensionID::OES_texture_float_linear:
 178           return new ClientWebGLExtensionTextureFloatLinear(*this);
 179         case WebGLExtensionID::OES_texture_half_float:
 180           return new ClientWebGLExtensionTextureHalfFloat(*this);
 181         case WebGLExtensionID::OES_texture_half_float_linear:
 182           return new ClientWebGLExtensionTextureHalfFloatLinear(*this);
 183         case WebGLExtensionID::OES_vertex_array_object:
 184           return new ClientWebGLExtensionVertexArray(*this);
 185
 186         // OVR_
 187         case WebGLExtensionID::OVR_multiview2:
 188           return new ClientWebGLExtensionMultiview(*this);
 189
 190         // WEBGL_
 191         case WebGLExtensionID::WEBGL_color_buffer_float:
 192           return new ClientWebGLExtensionColorBufferFloat(*this);
 193         case WebGLExtensionID::WEBGL_compressed_texture_astc:
 194           return new ClientWebGLExtensionCompressedTextureASTC(*this);
 195         case WebGLExtensionID::WEBGL_compressed_texture_etc:
 196           return new ClientWebGLExtensionCompressedTextureES3(*this);
 197         case WebGLExtensionID::WEBGL_compressed_texture_etc1:
 198           return new ClientWebGLExtensionCompressedTextureETC1(*this);
 199         case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
 200           return new ClientWebGLExtensionCompressedTexturePVRTC(*this);
 201         case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
 202           return new ClientWebGLExtensionCompressedTextureS3TC(*this);
 203         case WebGLExtensionID::WEBGL_compressed_texture_s3tc_srgb:
 204           return new ClientWebGLExtensionCompressedTextureS3TC_SRGB(*this);
 205         case WebGLExtensionID::WEBGL_debug_renderer_info: {
 206           if (callerType != dom::CallerType::System) {
 207             JsWarning(
 208                 "WEBGL_debug_renderer_info is deprecated in Firefox and will "
 209                 "be removed. Please use RENDERER.");
 210           }
 211           return new ClientWebGLExtensionDebugRendererInfo(*this);
 212         }
 213         case WebGLExtensionID::WEBGL_debug_shaders:
 214           return new ClientWebGLExtensionDebugShaders(*this);
 215         case WebGLExtensionID::WEBGL_depth_texture:
 216           return new ClientWebGLExtensionDepthTexture(*this);
 217         case WebGLExtensionID::WEBGL_draw_buffers:
 218           return new ClientWebGLExtensionDrawBuffers(*this);
 219         case WebGLExtensionID::WEBGL_explicit_present:
 220           return new ClientWebGLExtensionExplicitPresent(*this);
 221         case WebGLExtensionID::WEBGL_provoking_vertex:
 222           return new ClientWebGLExtensionProvokingVertex(*this);
 223
 224         case WebGLExtensionID::WEBGL_lose_context:
 225         case WebGLExtensionID::Max:
 226           break;
 227       }
 228       MOZ_CRASH("illegal extension enum");
 229     }();
 230     MOZ_ASSERT(extSlot);
 231     RequestExtension(ext);
 232   }
 233
 234   return extSlot;
 235 }
 236
 237 // ----------------------------
 238 // WebGLContext
 239
 240 bool WebGLContext::IsExtensionSupported(WebGLExtensionID ext) const {
 241   switch (ext) {
 242     case WebGLExtensionID::MOZ_debug:
 243     case WebGLExtensionID::WEBGL_debug_renderer_info:
 244     case WebGLExtensionID::WEBGL_debug_shaders:
 245     case WebGLExtensionID::WEBGL_lose_context:
 246       // Always supported.
 247       return true;
 248
 249     // In alphabetical order
 250     // ANGLE_
 251     case WebGLExtensionID::ANGLE_instanced_arrays:
 252       return WebGLExtensionInstancedArrays::IsSupported(this);
 253
 254     // EXT_
 255     case WebGLExtensionID::EXT_blend_minmax:
 256       return WebGLExtensionBlendMinMax::IsSupported(this);
 257
 258     case WebGLExtensionID::EXT_color_buffer_float:
 259       return WebGLExtensionEXTColorBufferFloat::IsSupported(this);
 260
 261     case WebGLExtensionID::EXT_color_buffer_half_float:
 262       return WebGLExtensionColorBufferHalfFloat::IsSupported(this);
 263
 264     case WebGLExtensionID::EXT_depth_clamp:
 265       return gl->IsSupported(gl::GLFeature::depth_clamp);
 266
 267     case WebGLExtensionID::EXT_disjoint_timer_query:
 268       return WebGLExtensionDisjointTimerQuery::IsSupported(this);
 269
 270     case WebGLExtensionID::EXT_float_blend:
 271       return WebGLExtensionFloatBlend::IsSupported(this);
 272
 273     case WebGLExtensionID::EXT_frag_depth:
 274       return WebGLExtensionFragDepth::IsSupported(this);
 275
 276     case WebGLExtensionID::EXT_shader_texture_lod:
 277       return WebGLExtensionShaderTextureLod::IsSupported(this);
 278
 279     case WebGLExtensionID::EXT_sRGB:
 280       return WebGLExtensionSRGB::IsSupported(this);
 281
 282     case WebGLExtensionID::EXT_texture_compression_bptc:
 283       return WebGLExtensionCompressedTextureBPTC::IsSupported(this);
 284
 285     case WebGLExtensionID::EXT_texture_compression_rgtc:
 286       return WebGLExtensionCompressedTextureRGTC::IsSupported(this);
 287
 288     case WebGLExtensionID::EXT_texture_filter_anisotropic:
 289       return gl->IsExtensionSupported(
 290           gl::GLContext::EXT_texture_filter_anisotropic);
 291
 292     case WebGLExtensionID::EXT_texture_norm16:
 293       return WebGLExtensionTextureNorm16::IsSupported(this);
 294
 295     // OES_
 296     case WebGLExtensionID::OES_draw_buffers_indexed:
 297       if (!IsWebGL2()) return false;
 298       return gl->IsSupported(gl::GLFeature::draw_buffers_indexed) &&
 299              gl->IsSupported(gl::GLFeature::get_integer_indexed);
 300
 301     case WebGLExtensionID::OES_element_index_uint:
 302       if (IsWebGL2()) return false;
 303       return gl->IsSupported(gl::GLFeature::element_index_uint);
 304
 305     case WebGLExtensionID::OES_fbo_render_mipmap:
 306       return WebGLExtensionFBORenderMipmap::IsSupported(this);
 307
 308     case WebGLExtensionID::OES_standard_derivatives:
 309       if (IsWebGL2()) return false;
 310       return gl->IsSupported(gl::GLFeature::standard_derivatives);
 311
 312     case WebGLExtensionID::OES_texture_float:
 313       return WebGLExtensionTextureFloat::IsSupported(this);
 314
 315     case WebGLExtensionID::OES_texture_float_linear:
 316       return gl->IsSupported(gl::GLFeature::texture_float_linear);
 317
 318     case WebGLExtensionID::OES_texture_half_float:
 319       return WebGLExtensionTextureHalfFloat::IsSupported(this);
 320
 321     case WebGLExtensionID::OES_texture_half_float_linear:
 322       if (IsWebGL2()) return false;
 323       return gl->IsSupported(gl::GLFeature::texture_half_float_linear);
 324
 325     case WebGLExtensionID::OES_vertex_array_object:
 326       return !IsWebGL2();  // Always supported in webgl1.
 327
 328     // OVR_
 329     case WebGLExtensionID::OVR_multiview2:
 330       return WebGLExtensionMultiview::IsSupported(this);
 331
 332     // WEBGL_
 333     case WebGLExtensionID::WEBGL_color_buffer_float:
 334       return WebGLExtensionColorBufferFloat::IsSupported(this);
 335
 336     case WebGLExtensionID::WEBGL_compressed_texture_astc:
 337       return WebGLExtensionCompressedTextureASTC::IsSupported(this);
 338
 339     case WebGLExtensionID::WEBGL_compressed_texture_etc:
 340       return gl->IsSupported(gl::GLFeature::ES3_compatibility) &&
 341              !gl->IsANGLE();
 342
 343     case WebGLExtensionID::WEBGL_compressed_texture_etc1:
 344       return gl->IsExtensionSupported(
 345                  gl::GLContext::OES_compressed_ETC1_RGB8_texture) &&
 346              !gl->IsANGLE();
 347
 348     case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
 349       return gl->IsExtensionSupported(
 350           gl::GLContext::IMG_texture_compression_pvrtc);
 351
 352     case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
 353       return WebGLExtensionCompressedTextureS3TC::IsSupported(this);
 354
 355     case WebGLExtensionID::WEBGL_compressed_texture_s3tc_srgb:
 356       return WebGLExtensionCompressedTextureS3TC_SRGB::IsSupported(this);
 357
 358     case WebGLExtensionID::WEBGL_depth_texture:
 359       return WebGLExtensionDepthTexture::IsSupported(this);
 360
 361     case WebGLExtensionID::WEBGL_draw_buffers:
 362       return WebGLExtensionDrawBuffers::IsSupported(this);
 363
 364     case WebGLExtensionID::WEBGL_explicit_present:
 365       return WebGLExtensionExplicitPresent::IsSupported(this);
 366
 367     case WebGLExtensionID::WEBGL_provoking_vertex:
 368       if (!gl->IsSupported(gl::GLFeature::provoking_vertex)) return false;
 369
 370       // > Implementations SHOULD only expose this extension when
 371       // > FIRST_VERTEX_CONVENTION is more efficient than the default behavior
 372       // > of LAST_VERTEX_CONVENTION.
 373       if (gl->IsANGLE()) return true;  // Better on D3D.
 374       if (kIsMacOS) {
 375         // Better on Metal, so probably Mac in general.
 376         return true;
 377       }
 378       return false;  // Probably not better for Win+GL, Linux, or Android.
 379
 380     case WebGLExtensionID::Max:
 381       break;
 382   }
 383
 384   MOZ_CRASH();
 385 }
 386
 387 bool WebGLContext::IsExtensionExplicit(const WebGLExtensionID ext) const {
 388   return mExtensions[ext] && mExtensions[ext]->IsExplicit();
 389 }
 390
 391 void WebGLContext::WarnIfImplicit(const WebGLExtensionID ext) const {
 392   const auto& extension = mExtensions[ext];
 393   if (!extension || extension->IsExplicit()) return;
 394
 395   GenerateWarning(
 396       "Using format enabled by implicitly enabled extension: %s. "
 397       "For maximal portability enable it explicitly.",
 398       GetExtensionName(ext));
 399 }
 400
 401 void WebGLContext::RequestExtension(const WebGLExtensionID ext,
 402                                     const bool explicitly) {
 403   const auto& limits = Limits();
 404   if (!limits.supportedExtensions[ext]) return;
 405
 406   auto& slot = mExtensions[ext];
 407   switch (ext) {
 408     // ANGLE_
 409     case WebGLExtensionID::ANGLE_instanced_arrays:
 410       slot.reset(new WebGLExtensionInstancedArrays(this));
 411       break;
 412
 413     // EXT_
 414     case WebGLExtensionID::EXT_blend_minmax:
 415       slot.reset(new WebGLExtensionBlendMinMax(this));
 416       break;
 417     case WebGLExtensionID::EXT_color_buffer_float:
 418       slot.reset(new WebGLExtensionEXTColorBufferFloat(this));
 419       break;
 420     case WebGLExtensionID::EXT_color_buffer_half_float:
 421       slot.reset(new WebGLExtensionColorBufferHalfFloat(this));
 422       break;
 423     case WebGLExtensionID::EXT_depth_clamp:
 424       slot.reset(new WebGLExtensionDepthClamp(this));
 425       break;
 426     case WebGLExtensionID::EXT_disjoint_timer_query:
 427       slot.reset(new WebGLExtensionDisjointTimerQuery(this));
 428       break;
 429     case WebGLExtensionID::EXT_float_blend:
 430       slot.reset(new WebGLExtensionFloatBlend(this));
 431       break;
 432     case WebGLExtensionID::EXT_frag_depth:
 433       slot.reset(new WebGLExtensionFragDepth(this));
 434       break;
 435     case WebGLExtensionID::EXT_shader_texture_lod:
 436       slot.reset(new WebGLExtensionShaderTextureLod(this));
 437       break;
 438     case WebGLExtensionID::EXT_sRGB:
 439       slot.reset(new WebGLExtensionSRGB(this));
 440       break;
 441     case WebGLExtensionID::EXT_texture_compression_bptc:
 442       slot.reset(new WebGLExtensionCompressedTextureBPTC(this));
 443       break;
 444     case WebGLExtensionID::EXT_texture_compression_rgtc:
 445       slot.reset(new WebGLExtensionCompressedTextureRGTC(this));
 446       break;
 447     case WebGLExtensionID::EXT_texture_filter_anisotropic:
 448       slot.reset(new WebGLExtensionTextureFilterAnisotropic(this));
 449       break;
 450     case WebGLExtensionID::EXT_texture_norm16:
 451       slot.reset(new WebGLExtensionTextureNorm16(this));
 452       break;
 453
 454     // MOZ_
 455     case WebGLExtensionID::MOZ_debug:
 456       slot.reset(new WebGLExtensionMOZDebug(this));
 457       break;
 458
 459     // OES_
 460     case WebGLExtensionID::OES_draw_buffers_indexed:
 461       slot.reset(new WebGLExtensionDrawBuffersIndexed(this));
 462       break;
 463     case WebGLExtensionID::OES_element_index_uint:
 464       slot.reset(new WebGLExtensionElementIndexUint(this));
 465       break;
 466     case WebGLExtensionID::OES_fbo_render_mipmap:
 467       slot.reset(new WebGLExtensionFBORenderMipmap(this));
 468       break;
 469     case WebGLExtensionID::OES_standard_derivatives:
 470       slot.reset(new WebGLExtensionStandardDerivatives(this));
 471       break;
 472     case WebGLExtensionID::OES_texture_float:
 473       slot.reset(new WebGLExtensionTextureFloat(this));
 474       break;
 475     case WebGLExtensionID::OES_texture_float_linear:
 476       slot.reset(new WebGLExtensionTextureFloatLinear(this));
 477       break;
 478     case WebGLExtensionID::OES_texture_half_float:
 479       slot.reset(new WebGLExtensionTextureHalfFloat(this));
 480       break;
 481     case WebGLExtensionID::OES_texture_half_float_linear:
 482       slot.reset(new WebGLExtensionTextureHalfFloatLinear(this));
 483       break;
 484     case WebGLExtensionID::OES_vertex_array_object:
 485       slot.reset(new WebGLExtensionVertexArray(this));
 486       break;
 487
 488     // WEBGL_
 489     case WebGLExtensionID::OVR_multiview2:
 490       slot.reset(new WebGLExtensionMultiview(this));
 491       break;
 492
 493     // WEBGL_
 494     case WebGLExtensionID::WEBGL_color_buffer_float:
 495       slot.reset(new WebGLExtensionColorBufferFloat(this));
 496       break;
 497     case WebGLExtensionID::WEBGL_compressed_texture_astc:
 498       slot.reset(new WebGLExtensionCompressedTextureASTC(this));
 499       break;
 500     case WebGLExtensionID::WEBGL_compressed_texture_etc:
 501       slot.reset(new WebGLExtensionCompressedTextureES3(this));
 502       break;
 503     case WebGLExtensionID::WEBGL_compressed_texture_etc1:
 504       slot.reset(new WebGLExtensionCompressedTextureETC1(this));
 505       break;
 506     case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
 507       slot.reset(new WebGLExtensionCompressedTexturePVRTC(this));
 508       break;
 509     case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
 510       slot.reset(new WebGLExtensionCompressedTextureS3TC(this));
 511       break;
 512     case WebGLExtensionID::WEBGL_compressed_texture_s3tc_srgb:
 513       slot.reset(new WebGLExtensionCompressedTextureS3TC_SRGB(this));
 514       break;
 515     case WebGLExtensionID::WEBGL_debug_renderer_info:
 516       slot.reset(new WebGLExtensionDebugRendererInfo(this));
 517       break;
 518     case WebGLExtensionID::WEBGL_debug_shaders:
 519       slot.reset(new WebGLExtensionDebugShaders(this));
 520       break;
 521     case WebGLExtensionID::WEBGL_depth_texture:
 522       slot.reset(new WebGLExtensionDepthTexture(this));
 523       break;
 524     case WebGLExtensionID::WEBGL_draw_buffers:
 525       slot.reset(new WebGLExtensionDrawBuffers(this));
 526       break;
 527     case WebGLExtensionID::WEBGL_explicit_present:
 528       slot.reset(new WebGLExtensionExplicitPresent(this));
 529       break;
 530     case WebGLExtensionID::WEBGL_lose_context:
 531       slot.reset(new WebGLExtensionLoseContext(this));
 532       break;
 533     case WebGLExtensionID::WEBGL_provoking_vertex:
 534       slot.reset(new WebGLExtensionProvokingVertex(this));
 535       break;
 536
 537     case WebGLExtensionID::Max:
 538       MOZ_CRASH();
 539   }
 540   MOZ_ASSERT(slot);
 541   const auto& obj = slot;
 542
 543   if (explicitly && !obj->IsExplicit()) {
 544     obj->SetExplicit();
 545   }
 546
 547   // Also enable implied extensions.
 548   switch (ext) {
 549     case WebGLExtensionID::EXT_color_buffer_float:
 550       RequestExtension(WebGLExtensionID::EXT_float_blend, false);
 551       break;
 552
 553     case WebGLExtensionID::OES_texture_float:
 554       RequestExtension(WebGLExtensionID::EXT_float_blend, false);
 555       RequestExtension(WebGLExtensionID::WEBGL_color_buffer_float, false);
 556       break;
 557
 558     case WebGLExtensionID::OES_texture_half_float:
 559       RequestExtension(WebGLExtensionID::EXT_color_buffer_half_float, false);
 560       break;
 561
 562     case WebGLExtensionID::WEBGL_color_buffer_float:
 563       RequestExtension(WebGLExtensionID::EXT_float_blend, false);
 564       break;
 565
 566     default:
 567       break;
 568   }
 569 }
 570
 571 }  // namespace mozilla