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   static EnumeratedArray<WebGLExtensionID, WebGLExtensionID::Max, const char*>
  21       sExtensionNamesEnumeratedArray;
  22   static bool initialized = false;
  23
  24   if (!initialized) {
  25     initialized = true;
  26
  27 #define WEBGL_EXTENSION_IDENTIFIER(x) \
  28   sExtensionNamesEnumeratedArray[WebGLExtensionID::x] = #x;
  29
  30     WEBGL_EXTENSION_IDENTIFIER(ANGLE_instanced_arrays)
  31     WEBGL_EXTENSION_IDENTIFIER(EXT_blend_minmax)
  32     WEBGL_EXTENSION_IDENTIFIER(EXT_color_buffer_float)
  33     WEBGL_EXTENSION_IDENTIFIER(EXT_color_buffer_half_float)
  34     WEBGL_EXTENSION_IDENTIFIER(EXT_disjoint_timer_query)
  35     WEBGL_EXTENSION_IDENTIFIER(EXT_float_blend)
  36     WEBGL_EXTENSION_IDENTIFIER(EXT_frag_depth)
  37     WEBGL_EXTENSION_IDENTIFIER(EXT_shader_texture_lod)
  38     WEBGL_EXTENSION_IDENTIFIER(EXT_sRGB)
  39     WEBGL_EXTENSION_IDENTIFIER(EXT_texture_compression_bptc)
  40     WEBGL_EXTENSION_IDENTIFIER(EXT_texture_compression_rgtc)
  41     WEBGL_EXTENSION_IDENTIFIER(EXT_texture_filter_anisotropic)
  42     WEBGL_EXTENSION_IDENTIFIER(EXT_texture_norm16)
  43     WEBGL_EXTENSION_IDENTIFIER(MOZ_debug)
  44     WEBGL_EXTENSION_IDENTIFIER(OES_draw_buffers_indexed)
  45     WEBGL_EXTENSION_IDENTIFIER(OES_element_index_uint)
  46     WEBGL_EXTENSION_IDENTIFIER(OES_fbo_render_mipmap)
  47     WEBGL_EXTENSION_IDENTIFIER(OES_standard_derivatives)
  48     WEBGL_EXTENSION_IDENTIFIER(OES_texture_float)
  49     WEBGL_EXTENSION_IDENTIFIER(OES_texture_float_linear)
  50     WEBGL_EXTENSION_IDENTIFIER(OES_texture_half_float)
  51     WEBGL_EXTENSION_IDENTIFIER(OES_texture_half_float_linear)
  52     WEBGL_EXTENSION_IDENTIFIER(OES_vertex_array_object)
  53     WEBGL_EXTENSION_IDENTIFIER(OVR_multiview2)
  54     WEBGL_EXTENSION_IDENTIFIER(WEBGL_color_buffer_float)
  55     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_astc)
  56     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_etc)
  57     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_etc1)
  58     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_pvrtc)
  59     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_s3tc)
  60     WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_s3tc_srgb)
  61     WEBGL_EXTENSION_IDENTIFIER(WEBGL_debug_renderer_info)
  62     WEBGL_EXTENSION_IDENTIFIER(WEBGL_debug_shaders)
  63     WEBGL_EXTENSION_IDENTIFIER(WEBGL_depth_texture)
  64     WEBGL_EXTENSION_IDENTIFIER(WEBGL_draw_buffers)
  65     WEBGL_EXTENSION_IDENTIFIER(WEBGL_explicit_present)
  66     WEBGL_EXTENSION_IDENTIFIER(WEBGL_lose_context)
  67     WEBGL_EXTENSION_IDENTIFIER(WEBGL_provoking_vertex)
  68
  69 #undef WEBGL_EXTENSION_IDENTIFIER
  70   }
  71
  72   return sExtensionNamesEnumeratedArray[ext];
  73 }
  74
  75 // ----------------------------
  76 // ClientWebGLContext
  77
  78 void ClientWebGLContext::GetExtension(JSContext* cx, const nsAString& wideName,
  79                                       JS::MutableHandle<JSObject*> retval,
  80                                       dom::CallerType callerType,
  81                                       ErrorResult& rv) {
  82   retval.set(nullptr);
  83   const FuncScope funcScope(*this, "getExtension");
  84   if (IsContextLost()) return;
  85
  86   const auto name = NS_ConvertUTF16toUTF8(wideName);
  87
  88   auto ext = WebGLExtensionID::Max;
  89
  90   // step 1: figure what extension is wanted
  91   for (const auto extension : MakeEnumeratedRange(WebGLExtensionID::Max)) {
  92     const auto& curName = GetExtensionName(extension);
  93     if (name.Equals(curName, nsCaseInsensitiveCStringComparator)) {
  94       ext = extension;
  95       break;
  96     }
  97   }
  98
  99   if (ext == WebGLExtensionID::Max) return;
 100
 101   RefPtr<ClientWebGLExtensionBase> extObj;
 102   if (ext == WebGLExtensionID::WEBGL_lose_context) {
 103     extObj = mExtLoseContext;
 104   } else {
 105     extObj = GetExtension(ext, callerType);
 106   }
 107   if (!extObj) return;
 108
 109   // Ugh, this would be easier returning `any` than `object`.
 110   JS::Rooted<JS::Value> v(cx);
 111   MOZ_ALWAYS_TRUE(dom::ToJSValue(cx, extObj, &v));
 112   if (v.isObject()) {
 113     retval.set(&v.toObject());
 114   }
 115 }
 116
 117 RefPtr<ClientWebGLExtensionBase> ClientWebGLContext::GetExtension(
 118     const WebGLExtensionID ext, const dom::CallerType callerType) {
 119   if (ext == WebGLExtensionID::WEBGL_lose_context) {
 120     // Always the same.
 121     return mExtLoseContext;
 122   }
 123
 124   if (!mNotLost) return nullptr;
 125
 126   if (!IsSupported(ext, callerType)) return nullptr;
 127
 128   auto& extSlot = mNotLost->extensions[UnderlyingValue(ext)];
 129   if (MOZ_UNLIKELY(!extSlot)) {
 130     extSlot = [&]() -> RefPtr<ClientWebGLExtensionBase> {
 131       switch (ext) {
 132         // ANGLE_
 133         case WebGLExtensionID::ANGLE_instanced_arrays:
 134           return new ClientWebGLExtensionInstancedArrays(*this);
 135
 136         // EXT_
 137         case WebGLExtensionID::EXT_blend_minmax:
 138           return new ClientWebGLExtensionBlendMinMax(*this);
 139         case WebGLExtensionID::EXT_color_buffer_float:
 140           return new ClientWebGLExtensionEXTColorBufferFloat(*this);
 141         case WebGLExtensionID::EXT_color_buffer_half_float:
 142           return new ClientWebGLExtensionColorBufferHalfFloat(*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_disjoint_timer_query:
 265       return WebGLExtensionDisjointTimerQuery::IsSupported(this);
 266
 267     case WebGLExtensionID::EXT_float_blend:
 268       return WebGLExtensionFloatBlend::IsSupported(this);
 269
 270     case WebGLExtensionID::EXT_frag_depth:
 271       return WebGLExtensionFragDepth::IsSupported(this);
 272
 273     case WebGLExtensionID::EXT_shader_texture_lod:
 274       return WebGLExtensionShaderTextureLod::IsSupported(this);
 275
 276     case WebGLExtensionID::EXT_sRGB:
 277       return WebGLExtensionSRGB::IsSupported(this);
 278
 279     case WebGLExtensionID::EXT_texture_compression_bptc:
 280       return WebGLExtensionCompressedTextureBPTC::IsSupported(this);
 281
 282     case WebGLExtensionID::EXT_texture_compression_rgtc:
 283       return WebGLExtensionCompressedTextureRGTC::IsSupported(this);
 284
 285     case WebGLExtensionID::EXT_texture_filter_anisotropic:
 286       return gl->IsExtensionSupported(
 287           gl::GLContext::EXT_texture_filter_anisotropic);
 288
 289     case WebGLExtensionID::EXT_texture_norm16:
 290       return WebGLExtensionTextureNorm16::IsSupported(this);
 291
 292     // OES_
 293     case WebGLExtensionID::OES_draw_buffers_indexed:
 294       if (!IsWebGL2()) return false;
 295       return gl->IsSupported(gl::GLFeature::draw_buffers_indexed) &&
 296              gl->IsSupported(gl::GLFeature::get_integer_indexed);
 297
 298     case WebGLExtensionID::OES_element_index_uint:
 299       if (IsWebGL2()) return false;
 300       return gl->IsSupported(gl::GLFeature::element_index_uint);
 301
 302     case WebGLExtensionID::OES_fbo_render_mipmap:
 303       return WebGLExtensionFBORenderMipmap::IsSupported(this);
 304
 305     case WebGLExtensionID::OES_standard_derivatives:
 306       if (IsWebGL2()) return false;
 307       return gl->IsSupported(gl::GLFeature::standard_derivatives);
 308
 309     case WebGLExtensionID::OES_texture_float:
 310       return WebGLExtensionTextureFloat::IsSupported(this);
 311
 312     case WebGLExtensionID::OES_texture_float_linear:
 313       return gl->IsSupported(gl::GLFeature::texture_float_linear);
 314
 315     case WebGLExtensionID::OES_texture_half_float:
 316       return WebGLExtensionTextureHalfFloat::IsSupported(this);
 317
 318     case WebGLExtensionID::OES_texture_half_float_linear:
 319       if (IsWebGL2()) return false;
 320       return gl->IsSupported(gl::GLFeature::texture_half_float_linear);
 321
 322     case WebGLExtensionID::OES_vertex_array_object:
 323       return !IsWebGL2();  // Always supported in webgl1.
 324
 325     // OVR_
 326     case WebGLExtensionID::OVR_multiview2:
 327       return WebGLExtensionMultiview::IsSupported(this);
 328
 329     // WEBGL_
 330     case WebGLExtensionID::WEBGL_color_buffer_float:
 331       return WebGLExtensionColorBufferFloat::IsSupported(this);
 332
 333     case WebGLExtensionID::WEBGL_compressed_texture_astc:
 334       return WebGLExtensionCompressedTextureASTC::IsSupported(this);
 335
 336     case WebGLExtensionID::WEBGL_compressed_texture_etc:
 337       return gl->IsSupported(gl::GLFeature::ES3_compatibility) &&
 338              !gl->IsANGLE();
 339
 340     case WebGLExtensionID::WEBGL_compressed_texture_etc1:
 341       return gl->IsExtensionSupported(
 342                  gl::GLContext::OES_compressed_ETC1_RGB8_texture) &&
 343              !gl->IsANGLE();
 344
 345     case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
 346       return gl->IsExtensionSupported(
 347           gl::GLContext::IMG_texture_compression_pvrtc);
 348
 349     case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
 350       return WebGLExtensionCompressedTextureS3TC::IsSupported(this);
 351
 352     case WebGLExtensionID::WEBGL_compressed_texture_s3tc_srgb:
 353       return WebGLExtensionCompressedTextureS3TC_SRGB::IsSupported(this);
 354
 355     case WebGLExtensionID::WEBGL_depth_texture:
 356       return WebGLExtensionDepthTexture::IsSupported(this);
 357
 358     case WebGLExtensionID::WEBGL_draw_buffers:
 359       return WebGLExtensionDrawBuffers::IsSupported(this);
 360
 361     case WebGLExtensionID::WEBGL_explicit_present:
 362       return WebGLExtensionExplicitPresent::IsSupported(this);
 363
 364     case WebGLExtensionID::WEBGL_provoking_vertex:
 365       if (!gl->IsSupported(gl::GLFeature::provoking_vertex)) return false;
 366
 367       // > Implementations SHOULD only expose this extension when
 368       // > FIRST_VERTEX_CONVENTION is more efficient than the default behavior
 369       // > of LAST_VERTEX_CONVENTION.
 370       if (gl->IsANGLE()) return true;  // Better on D3D.
 371       if (kIsMacOS) {
 372         // Better on Metal, so probably Mac in general.
 373         return true;
 374       }
 375       return false;  // Probably not better for Win+GL, Linux, or Android.
 376
 377     case WebGLExtensionID::Max:
 378       break;
 379   }
 380
 381   MOZ_CRASH();
 382 }
 383
 384 bool WebGLContext::IsExtensionExplicit(const WebGLExtensionID ext) const {
 385   return mExtensions[ext] && mExtensions[ext]->IsExplicit();
 386 }
 387
 388 void WebGLContext::WarnIfImplicit(const WebGLExtensionID ext) const {
 389   const auto& extension = mExtensions[ext];
 390   if (!extension || extension->IsExplicit()) return;
 391
 392   GenerateWarning(
 393       "Using format enabled by implicitly enabled extension: %s. "
 394       "For maximal portability enable it explicitly.",
 395       GetExtensionName(ext));
 396 }
 397
 398 void WebGLContext::RequestExtension(const WebGLExtensionID ext,
 399                                     const bool explicitly) {
 400   const auto& limits = Limits();
 401   if (!limits.supportedExtensions[ext]) return;
 402
 403   auto& slot = mExtensions[ext];
 404   switch (ext) {
 405     // ANGLE_
 406     case WebGLExtensionID::ANGLE_instanced_arrays:
 407       slot.reset(new WebGLExtensionInstancedArrays(this));
 408       break;
 409
 410     // EXT_
 411     case WebGLExtensionID::EXT_blend_minmax:
 412       slot.reset(new WebGLExtensionBlendMinMax(this));
 413       break;
 414     case WebGLExtensionID::EXT_color_buffer_float:
 415       slot.reset(new WebGLExtensionEXTColorBufferFloat(this));
 416       break;
 417     case WebGLExtensionID::EXT_color_buffer_half_float:
 418       slot.reset(new WebGLExtensionColorBufferHalfFloat(this));
 419       break;
 420     case WebGLExtensionID::EXT_disjoint_timer_query:
 421       slot.reset(new WebGLExtensionDisjointTimerQuery(this));
 422       break;
 423     case WebGLExtensionID::EXT_float_blend:
 424       slot.reset(new WebGLExtensionFloatBlend(this));
 425       break;
 426     case WebGLExtensionID::EXT_frag_depth:
 427       slot.reset(new WebGLExtensionFragDepth(this));
 428       break;
 429     case WebGLExtensionID::EXT_shader_texture_lod:
 430       slot.reset(new WebGLExtensionShaderTextureLod(this));
 431       break;
 432     case WebGLExtensionID::EXT_sRGB:
 433       slot.reset(new WebGLExtensionSRGB(this));
 434       break;
 435     case WebGLExtensionID::EXT_texture_compression_bptc:
 436       slot.reset(new WebGLExtensionCompressedTextureBPTC(this));
 437       break;
 438     case WebGLExtensionID::EXT_texture_compression_rgtc:
 439       slot.reset(new WebGLExtensionCompressedTextureRGTC(this));
 440       break;
 441     case WebGLExtensionID::EXT_texture_filter_anisotropic:
 442       slot.reset(new WebGLExtensionTextureFilterAnisotropic(this));
 443       break;
 444     case WebGLExtensionID::EXT_texture_norm16:
 445       slot.reset(new WebGLExtensionTextureNorm16(this));
 446       break;
 447
 448     // MOZ_
 449     case WebGLExtensionID::MOZ_debug:
 450       slot.reset(new WebGLExtensionMOZDebug(this));
 451       break;
 452
 453     // OES_
 454     case WebGLExtensionID::OES_draw_buffers_indexed:
 455       slot.reset(new WebGLExtensionDrawBuffersIndexed(this));
 456       break;
 457     case WebGLExtensionID::OES_element_index_uint:
 458       slot.reset(new WebGLExtensionElementIndexUint(this));
 459       break;
 460     case WebGLExtensionID::OES_fbo_render_mipmap:
 461       slot.reset(new WebGLExtensionFBORenderMipmap(this));
 462       break;
 463     case WebGLExtensionID::OES_standard_derivatives:
 464       slot.reset(new WebGLExtensionStandardDerivatives(this));
 465       break;
 466     case WebGLExtensionID::OES_texture_float:
 467       slot.reset(new WebGLExtensionTextureFloat(this));
 468       break;
 469     case WebGLExtensionID::OES_texture_float_linear:
 470       slot.reset(new WebGLExtensionTextureFloatLinear(this));
 471       break;
 472     case WebGLExtensionID::OES_texture_half_float:
 473       slot.reset(new WebGLExtensionTextureHalfFloat(this));
 474       break;
 475     case WebGLExtensionID::OES_texture_half_float_linear:
 476       slot.reset(new WebGLExtensionTextureHalfFloatLinear(this));
 477       break;
 478     case WebGLExtensionID::OES_vertex_array_object:
 479       slot.reset(new WebGLExtensionVertexArray(this));
 480       break;
 481
 482     // WEBGL_
 483     case WebGLExtensionID::OVR_multiview2:
 484       slot.reset(new WebGLExtensionMultiview(this));
 485       break;
 486
 487     // WEBGL_
 488     case WebGLExtensionID::WEBGL_color_buffer_float:
 489       slot.reset(new WebGLExtensionColorBufferFloat(this));
 490       break;
 491     case WebGLExtensionID::WEBGL_compressed_texture_astc:
 492       slot.reset(new WebGLExtensionCompressedTextureASTC(this));
 493       break;
 494     case WebGLExtensionID::WEBGL_compressed_texture_etc:
 495       slot.reset(new WebGLExtensionCompressedTextureES3(this));
 496       break;
 497     case WebGLExtensionID::WEBGL_compressed_texture_etc1:
 498       slot.reset(new WebGLExtensionCompressedTextureETC1(this));
 499       break;
 500     case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
 501       slot.reset(new WebGLExtensionCompressedTexturePVRTC(this));
 502       break;
 503     case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
 504       slot.reset(new WebGLExtensionCompressedTextureS3TC(this));
 505       break;
 506     case WebGLExtensionID::WEBGL_compressed_texture_s3tc_srgb:
 507       slot.reset(new WebGLExtensionCompressedTextureS3TC_SRGB(this));
 508       break;
 509     case WebGLExtensionID::WEBGL_debug_renderer_info:
 510       slot.reset(new WebGLExtensionDebugRendererInfo(this));
 511       break;
 512     case WebGLExtensionID::WEBGL_debug_shaders:
 513       slot.reset(new WebGLExtensionDebugShaders(this));
 514       break;
 515     case WebGLExtensionID::WEBGL_depth_texture:
 516       slot.reset(new WebGLExtensionDepthTexture(this));
 517       break;
 518     case WebGLExtensionID::WEBGL_draw_buffers:
 519       slot.reset(new WebGLExtensionDrawBuffers(this));
 520       break;
 521     case WebGLExtensionID::WEBGL_explicit_present:
 522       slot.reset(new WebGLExtensionExplicitPresent(this));
 523       break;
 524     case WebGLExtensionID::WEBGL_lose_context:
 525       slot.reset(new WebGLExtensionLoseContext(this));
 526       break;
 527     case WebGLExtensionID::WEBGL_provoking_vertex:
 528       slot.reset(new WebGLExtensionProvokingVertex(this));
 529       break;
 530
 531     case WebGLExtensionID::Max:
 532       MOZ_CRASH();
 533   }
 534   MOZ_ASSERT(slot);
 535   const auto& obj = slot;
 536
 537   if (explicitly && !obj->IsExplicit()) {
 538     obj->SetExplicit();
 539   }
 540
 541   // Also enable implied extensions.
 542   switch (ext) {
 543     case WebGLExtensionID::EXT_color_buffer_float:
 544       RequestExtension(WebGLExtensionID::EXT_float_blend, false);
 545       break;
 546
 547     case WebGLExtensionID::OES_texture_float:
 548       RequestExtension(WebGLExtensionID::EXT_float_blend, false);
 549       RequestExtension(WebGLExtensionID::WEBGL_color_buffer_float, false);
 550       break;
 551
 552     case WebGLExtensionID::OES_texture_half_float:
 553       RequestExtension(WebGLExtensionID::EXT_color_buffer_half_float, false);
 554       break;
 555
 556     case WebGLExtensionID::WEBGL_color_buffer_float:
 557       RequestExtension(WebGLExtensionID::EXT_float_blend, false);
 558       break;
 559
 560     default:
 561       break;
 562   }
 563 }
 564
 565 }  // namespace mozilla