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