dom/canvas/WebGLContext.h

   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 #ifndef WEBGLCONTEXT_H_
   7 #define WEBGLCONTEXT_H_
   8
   9 #include <bitset>
  10 #include <memory>
  11 #include <stdarg.h>
  12
  13 #include "GLContextTypes.h"
  14 #include "GLDefs.h"
  15 #include "GLScreenBuffer.h"
  16 #include "js/ScalarType.h"  // js::Scalar::Type
  17 #include "mozilla/Attributes.h"
  18 #include "mozilla/Atomics.h"
  19 #include "mozilla/CheckedInt.h"
  20 #include "mozilla/dom/BindingDeclarations.h"
  21 #include "mozilla/dom/HTMLCanvasElement.h"
  22 #include "mozilla/dom/Nullable.h"
  23 #include "mozilla/dom/TypedArray.h"
  24 #include "mozilla/EnumeratedArray.h"
  25 #include "mozilla/gfx/2D.h"
  26 #include "mozilla/Mutex.h"
  27 #include "mozilla/StaticMutex.h"
  28 #include "mozilla/UniquePtr.h"
  29 #include "mozilla/WeakPtr.h"
  30 #include "nsICanvasRenderingContextInternal.h"
  31 #include "nsTArray.h"
  32 #include "SurfaceTypes.h"
  33 #include "ScopedGLHelpers.h"
  34 #include "TexUnpackBlob.h"
  35
  36 // Local
  37 #include "CacheInvalidator.h"
  38 #include "WebGLContextLossHandler.h"
  39 #include "WebGLExtensions.h"
  40 #include "WebGLObjectModel.h"
  41 #include "WebGLStrongTypes.h"
  42 #include "WebGLTypes.h"
  43
  44 // Generated
  45 #include "mozilla/dom/WebGLRenderingContextBinding.h"
  46 #include "mozilla/dom/WebGL2RenderingContextBinding.h"
  47
  48 #include <list>
  49
  50 class nsIDocShell;
  51
  52 // WebGL-only GLenums
  53 // clang-format off
  54 #define LOCAL_GL_BROWSER_DEFAULT_WEBGL              0x9244
  55 #define LOCAL_GL_CONTEXT_LOST_WEBGL                 0x9242
  56 #define LOCAL_GL_MAX_CLIENT_WAIT_TIMEOUT_WEBGL      0x9247
  57 #define LOCAL_GL_UNPACK_COLORSPACE_CONVERSION_WEBGL 0x9243
  58 #define LOCAL_GL_UNPACK_FLIP_Y_WEBGL                0x9240
  59 #define LOCAL_GL_UNPACK_PREMULTIPLY_ALPHA_WEBGL     0x9241
  60 // clang-format on
  61
  62 namespace mozilla {
  63 class HostWebGLContext;
  64 class ScopedCopyTexImageSource;
  65 class ScopedDrawCallWrapper;
  66 class ScopedResolveTexturesForDraw;
  67 class WebGLBuffer;
  68 class WebGLExtensionBase;
  69 class WebGLFramebuffer;
  70 class WebGLProgram;
  71 class WebGLQuery;
  72 class WebGLRenderbuffer;
  73 class WebGLSampler;
  74 class WebGLShader;
  75 class WebGLSync;
  76 class WebGLTexture;
  77 class WebGLTransformFeedback;
  78 class WebGLVertexArray;
  79
  80 namespace dom {
  81 class Document;
  82 class Element;
  83 class ImageData;
  84 class OwningHTMLCanvasElementOrOffscreenCanvas;
  85 struct WebGLContextAttributes;
  86 }  // namespace dom
  87
  88 namespace gfx {
  89 class SourceSurface;
  90 class VRLayerChild;
  91 }  // namespace gfx
  92
  93 namespace gl {
  94 class GLScreenBuffer;
  95 class MozFramebuffer;
  96 class SharedSurface;
  97 class Texture;
  98 }  // namespace gl
  99
 100 namespace layers {
 101 class CompositableHost;
 102 class RemoteTextureOwnerClient;
 103 class SurfaceDescriptor;
 104 }  // namespace layers
 105
 106 namespace webgl {
 107 class AvailabilityRunnable;
 108 struct CachedDrawFetchLimits;
 109 struct FbAttachInfo;
 110 struct FormatInfo;
 111 class FormatUsageAuthority;
 112 struct FormatUsageInfo;
 113 struct ImageInfo;
 114 struct LinkedProgramInfo;
 115 struct SamplerUniformInfo;
 116 struct SamplingState;
 117 class ScopedPrepForResourceClear;
 118 class ShaderValidator;
 119 class TexUnpackBlob;
 120 struct UniformInfo;
 121 struct UniformBlockInfo;
 122 struct VertAttribPointerDesc;
 123 }  // namespace webgl
 124
 125 struct WebGLTexImageData {
 126   TexImageTarget mTarget;
 127   int32_t mRowLength;
 128   uint32_t mWidth;
 129   uint32_t mHeight;
 130   uint32_t mDepth;
 131   gfxAlphaType mSrcAlphaType;
 132 };
 133
 134 struct WebGLTexPboOffset {
 135   TexImageTarget mTarget;
 136   uint32_t mWidth;
 137   uint32_t mHeight;
 138   uint32_t mDepth;
 139   WebGLsizeiptr mPboOffset;
 140   bool mHasExpectedImageSize;
 141   GLsizei mExpectedImageSize;
 142 };
 143
 144 WebGLTexelFormat GetWebGLTexelFormat(TexInternalFormat format);
 145
 146 void AssertUintParamCorrect(gl::GLContext* gl, GLenum pname, GLuint shadow);
 147
 148 // From WebGLContextUtils
 149 TexTarget TexImageTargetToTexTarget(TexImageTarget texImageTarget);
 150
 151 struct WebGLIntOrFloat {
 152   const enum { Int, Float, Uint } mType;
 153
 154   union {
 155     GLint i;
 156     GLfloat f;
 157     GLuint u;
 158   } mValue;
 159
 160   explicit WebGLIntOrFloat(GLint i) : mType(Int) { mValue.i = i; }
 161   explicit WebGLIntOrFloat(GLfloat f) : mType(Float) { mValue.f = f; }
 162
 163   GLint AsInt() const {
 164     return (mType == Int) ? mValue.i : NS_lroundf(mValue.f);
 165   }
 166   GLfloat AsFloat() const {
 167     return (mType == Float) ? mValue.f : GLfloat(mValue.i);
 168   }
 169 };
 170
 171 struct IndexedBufferBinding {
 172   RefPtr<WebGLBuffer> mBufferBinding;
 173   uint64_t mRangeStart;
 174   uint64_t mRangeSize;
 175
 176   IndexedBufferBinding();
 177
 178   uint64_t ByteCount() const;
 179 };
 180
 181 ////////////////////////////////////
 182
 183 namespace webgl {
 184
 185 class AvailabilityRunnable final : public DiscardableRunnable {
 186  public:
 187   const WeakPtr<const ClientWebGLContext> mWebGL;
 188   std::vector<WeakPtr<WebGLQueryJS>> mQueries;
 189   std::vector<WeakPtr<WebGLSyncJS>> mSyncs;
 190
 191   explicit AvailabilityRunnable(const ClientWebGLContext* webgl);
 192   ~AvailabilityRunnable();
 193
 194   NS_IMETHOD Run() override;
 195 };
 196
 197 struct BufferAndIndex final {
 198   const WebGLBuffer* buffer = nullptr;
 199   uint32_t id = -1;
 200 };
 201
 202 }  // namespace webgl
 203
 204 ////////////////////////////////////////////////////////////////////////////////
 205
 206 class WebGLContext : public VRefCounted, public SupportsWeakPtr {
 207   friend class ScopedDrawCallWrapper;
 208   friend class ScopedDrawWithTransformFeedback;
 209   friend class ScopedFakeVertexAttrib0;
 210   friend class ScopedFBRebinder;
 211   friend class WebGL2Context;
 212   friend class WebGLContextUserData;
 213   friend class WebGLExtensionCompressedTextureASTC;
 214   friend class WebGLExtensionCompressedTextureBPTC;
 215   friend class WebGLExtensionCompressedTextureES3;
 216   friend class WebGLExtensionCompressedTextureETC1;
 217   friend class WebGLExtensionCompressedTexturePVRTC;
 218   friend class WebGLExtensionCompressedTextureRGTC;
 219   friend class WebGLExtensionCompressedTextureS3TC;
 220   friend class WebGLExtensionCompressedTextureS3TC_SRGB;
 221   friend class WebGLExtensionDepthTexture;
 222   friend class WebGLExtensionDisjointTimerQuery;
 223   friend class WebGLExtensionDrawBuffers;
 224   friend class WebGLExtensionLoseContext;
 225   friend class WebGLExtensionMOZDebug;
 226   friend class WebGLExtensionVertexArray;
 227   friend class WebGLMemoryTracker;
 228   friend class webgl::AvailabilityRunnable;
 229   friend struct webgl::LinkedProgramInfo;
 230   friend struct webgl::SamplerUniformInfo;
 231   friend class webgl::ScopedPrepForResourceClear;
 232   friend struct webgl::UniformBlockInfo;
 233
 234   friend const webgl::CachedDrawFetchLimits* ValidateDraw(WebGLContext*, GLenum,
 235                                                           uint32_t);
 236   friend RefPtr<const webgl::LinkedProgramInfo> QueryProgramInfo(
 237       WebGLProgram* prog, gl::GLContext* gl);
 238
 239   MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(WebGLContext, override)
 240
 241   enum {
 242     UNPACK_FLIP_Y_WEBGL = 0x9240,
 243     UNPACK_PREMULTIPLY_ALPHA_WEBGL = 0x9241,
 244     // We throw InvalidOperation in TexImage if we fail to use GPU fast-path
 245     // for texture copy when it is set to true, only for debug purpose.
 246     UNPACK_REQUIRE_FASTPATH = 0x10001,
 247     CONTEXT_LOST_WEBGL = 0x9242,
 248     UNPACK_COLORSPACE_CONVERSION_WEBGL = 0x9243,
 249     BROWSER_DEFAULT_WEBGL = 0x9244,
 250     UNMASKED_VENDOR_WEBGL = 0x9245,
 251     UNMASKED_RENDERER_WEBGL = 0x9246
 252   };
 253
 254  private:
 255   class LruPosition final {
 256     std::list<WebGLContext*>::iterator mItr;
 257
 258     LruPosition(const LruPosition&) = delete;
 259     LruPosition(LruPosition&&) = delete;
 260     LruPosition& operator=(const LruPosition&) = delete;
 261     LruPosition& operator=(LruPosition&&) = delete;
 262
 263    public:
 264     void AssignLocked(WebGLContext& aContext) MOZ_REQUIRES(sLruMutex);
 265     void Reset();
 266     void ResetLocked() MOZ_REQUIRES(sLruMutex);
 267     bool IsInsertedLocked() const MOZ_REQUIRES(sLruMutex);
 268
 269     LruPosition();
 270     explicit LruPosition(WebGLContext&);
 271
 272     ~LruPosition() { Reset(); }
 273   };
 274
 275   mutable LruPosition mLruPosition MOZ_GUARDED_BY(sLruMutex);
 276
 277   void BumpLruLocked() MOZ_REQUIRES(sLruMutex);
 278
 279  public:
 280   void BumpLru();
 281   void LoseLruContextIfLimitExceeded();
 282
 283   // -
 284
 285   // We've had issues in the past with nulling `gl` without actually releasing
 286   // all of our resources. This construction ensures that we are aware that we
 287   // should only null `gl` in DestroyResourcesAndContext.
 288   RefPtr<gl::GLContext> mGL_OnlyClearInDestroyResourcesAndContext;
 289
 290  public:
 291   // Grab a const reference so we can see changes, but can't make changes.
 292   const decltype(mGL_OnlyClearInDestroyResourcesAndContext)& gl;
 293
 294  public:
 295   void CheckForInactivity();
 296
 297  protected:
 298   const WeakPtr<HostWebGLContext> mHost;
 299   const bool mResistFingerprinting;
 300   WebGLContextOptions mOptions;
 301   const uint32_t mPrincipalKey;
 302   Maybe<webgl::Limits> mLimits;
 303
 304   bool mIsContextLost = false;
 305   Atomic<bool> mPendingContextLoss;
 306   webgl::ContextLossReason mPendingContextLossReason =
 307       webgl::ContextLossReason::None;
 308   const uint32_t mMaxPerfWarnings;
 309   mutable uint64_t mNumPerfWarnings = 0;
 310   const uint32_t mMaxAcceptableFBStatusInvals;
 311   bool mWarnOnce_DepthTexCompareFilterable = true;
 312
 313   uint64_t mNextFenceId = 1;
 314   uint64_t mCompletedFenceId = 0;
 315
 316   std::unique_ptr<gl::Texture> mIncompleteTexOverride;
 317
 318  public:
 319   class FuncScope;
 320
 321  private:
 322   mutable FuncScope* mFuncScope = nullptr;
 323
 324  public:
 325   static RefPtr<WebGLContext> Create(HostWebGLContext&,
 326                                      const webgl::InitContextDesc&,
 327                                      webgl::InitContextResult* out);
 328
 329  private:
 330   void FinishInit();
 331
 332  protected:
 333   WebGLContext(HostWebGLContext&, const webgl::InitContextDesc&);
 334   virtual ~WebGLContext();
 335
 336   RefPtr<layers::CompositableHost> mCompositableHost;
 337
 338   layers::LayersBackend mBackend = layers::LayersBackend::LAYERS_NONE;
 339
 340  public:
 341   void Resize(uvec2 size);
 342
 343   void SetCompositableHost(RefPtr<layers::CompositableHost>& aCompositableHost);
 344
 345   /**
 346    * An abstract base class to be implemented by callers wanting to be notified
 347    * that a refresh has occurred. Callers must ensure an observer is removed
 348    * before it is destroyed.
 349    */
 350   virtual void DidRefresh();
 351
 352   void OnMemoryPressure();
 353
 354   // -
 355
 356   /*
 357
 358   Here are the bind calls that are supposed to be fully-validated client side,
 359   so that client's binding state doesn't diverge:
 360   * AttachShader
 361   * DetachShader
 362   * BindFramebuffer
 363   * FramebufferAttach
 364   * BindBuffer
 365   * BindBufferRange
 366   * BindTexture
 367   * UseProgram
 368   * BindSampler
 369   * BindTransformFeedback
 370   * BindVertexArray
 371   * BeginQuery
 372   * EndQuery
 373   * ActiveTexture
 374
 375   */
 376
 377   const auto& CurFuncScope() const { return *mFuncScope; }
 378   const char* FuncName() const;
 379
 380   class FuncScope final {
 381    public:
 382     const WebGLContext& mWebGL;
 383     const char* const mFuncName;
 384     bool mBindFailureGuard = false;
 385
 386    public:
 387     FuncScope(const WebGLContext& webgl, const char* funcName);
 388     ~FuncScope();
 389   };
 390
 391   void GenerateErrorImpl(const GLenum err, const nsACString& text) const {
 392     GenerateErrorImpl(err, std::string(text.BeginReading()));
 393   }
 394   void GenerateErrorImpl(const GLenum err, const std::string& text) const;
 395
 396   void GenerateError(const webgl::ErrorInfo& err) {
 397     GenerateError(err.type, "%s", err.info.c_str());
 398   }
 399
 400   template <typename... Args>
 401   void GenerateError(const GLenum err, const char* const fmt,
 402                      const Args&... args) const {
 403     MOZ_ASSERT(FuncName());
 404
 405     nsCString text;
 406     text.AppendPrintf("WebGL warning: %s: ", FuncName());
 407
 408 #ifdef __clang__
 409 #  pragma clang diagnostic push
 410 #  pragma clang diagnostic ignored "-Wformat-security"
 411 #elif defined(__GNUC__)
 412 #  pragma GCC diagnostic push
 413 #  pragma GCC diagnostic ignored "-Wformat-security"
 414 #endif
 415     text.AppendPrintf(fmt, args...);
 416 #ifdef __clang__
 417 #  pragma clang diagnostic pop
 418 #elif defined(__GNUC__)
 419 #  pragma GCC diagnostic pop
 420 #endif
 421
 422     GenerateErrorImpl(err, text);
 423   }
 424
 425   template <typename... Args>
 426   void ErrorInvalidEnum(const char* const fmt, const Args&... args) const {
 427     GenerateError(LOCAL_GL_INVALID_ENUM, fmt, args...);
 428   }
 429   template <typename... Args>
 430   void ErrorInvalidOperation(const char* const fmt, const Args&... args) const {
 431     GenerateError(LOCAL_GL_INVALID_OPERATION, fmt, args...);
 432   }
 433   template <typename... Args>
 434   void ErrorInvalidValue(const char* const fmt, const Args&... args) const {
 435     GenerateError(LOCAL_GL_INVALID_VALUE, fmt, args...);
 436   }
 437   template <typename... Args>
 438   void ErrorInvalidFramebufferOperation(const char* const fmt,
 439                                         const Args&... args) const {
 440     GenerateError(LOCAL_GL_INVALID_FRAMEBUFFER_OPERATION, fmt, args...);
 441   }
 442   template <typename... Args>
 443   void ErrorOutOfMemory(const char* const fmt, const Args&... args) const {
 444     GenerateError(LOCAL_GL_OUT_OF_MEMORY, fmt, args...);
 445   }
 446
 447   template <typename... Args>
 448   void ErrorImplementationBug(const char* const fmt,
 449                               const Args&... args) const {
 450     const nsPrintfCString newFmt(
 451         "Implementation bug, please file at %s! %s",
 452         "https://bugzilla.mozilla.org/"
 453         "enter_bug.cgi?product=Core&component=Canvas%3A+WebGL",
 454         fmt);
 455     GenerateError(LOCAL_GL_OUT_OF_MEMORY, newFmt.BeginReading(), args...);
 456     MOZ_ASSERT(false, "WebGLContext::ErrorImplementationBug");
 457     NS_ERROR("WebGLContext::ErrorImplementationBug");
 458   }
 459
 460   void ErrorInvalidEnumInfo(const char* info, GLenum enumValue) const;
 461   void ErrorInvalidEnumArg(const char* argName, GLenum val) const;
 462
 463   static const char* ErrorName(GLenum error);
 464
 465   /**
 466    * Return displayable name for GLenum.
 467    * This version is like gl::GLenumToStr but with out the GL_ prefix to
 468    * keep consistency with how errors are reported from WebGL.
 469    * Returns hex formatted version of glenum if glenum is unknown.
 470    */
 471   static void EnumName(GLenum val, nsCString* out_name);
 472
 473   void DummyReadFramebufferOperation();
 474
 475   WebGLTexture* GetActiveTex(const GLenum texTarget) const;
 476
 477   gl::GLContext* GL() const { return gl; }
 478
 479   bool IsPremultAlpha() const { return mOptions.premultipliedAlpha; }
 480
 481   bool IsPreservingDrawingBuffer() const {
 482     return mOptions.preserveDrawingBuffer;
 483   }
 484
 485   // Present to compositor
 486  private:
 487   bool PresentInto(gl::SwapChain& swapChain);
 488   bool PresentIntoXR(gl::SwapChain& swapChain, const gl::MozFramebuffer& xrFb);
 489
 490  public:
 491   // Present swaps the front and back buffers of the swap chain for compositing.
 492   // This assumes the framebuffer may directly alias with the back buffer,
 493   // dependent on remoting state or other concerns. Framebuffer and swap chain
 494   // surface formats are assumed to be similar to enable this aliasing. As such,
 495   // the back buffer may be invalidated by this swap with the front buffer,
 496   // unless overriden by explicitly setting the preserveDrawingBuffer option,
 497   // which may incur a further copy to preserve the back buffer.
 498   void Present(
 499       WebGLFramebuffer*, layers::TextureType, const bool webvr,
 500       const webgl::SwapChainOptions& options = webgl::SwapChainOptions());
 501   // CopyToSwapChain forces a copy from the supplied framebuffer into the back
 502   // buffer before swapping the front and back buffers of the swap chain for
 503   // compositing. The formats of the framebuffer and the swap chain buffers
 504   // may differ subject to available format conversion options. Since this
 505   // operation uses an explicit copy, it inherently preserves the framebuffer
 506   // without need to set the preserveDrawingBuffer option.
 507   void CopyToSwapChain(
 508       WebGLFramebuffer*, layers::TextureType,
 509       const webgl::SwapChainOptions& options = webgl::SwapChainOptions());
 510   // In use cases where a framebuffer is used as an offscreen framebuffer and
 511   // does not need to be committed to the swap chain, it may still be useful
 512   // for the implementation to delineate distinct frames, such as when sharing
 513   // a single WebGLContext amongst many distinct users. EndOfFrame signals that
 514   // frame rendering is complete so that any implementation side-effects such
 515   // as resetting internal profile counters or resource queues may be handled
 516   // appropriately.
 517   void EndOfFrame();
 518   RefPtr<gfx::DataSourceSurface> GetFrontBufferSnapshot();
 519   Maybe<uvec2> FrontBufferSnapshotInto(
 520       const Maybe<Range<uint8_t>> dest,
 521       const Maybe<size_t> destStride = Nothing());
 522   Maybe<uvec2> FrontBufferSnapshotInto(
 523       const std::shared_ptr<gl::SharedSurface>& front,
 524       const Maybe<Range<uint8_t>> dest,
 525       const Maybe<size_t> destStride = Nothing());
 526   Maybe<uvec2> SnapshotInto(GLuint srcFb, const gfx::IntSize& size,
 527                             const Range<uint8_t>& dest,
 528                             const Maybe<size_t> destStride = Nothing());
 529   gl::SwapChain* GetSwapChain(WebGLFramebuffer*, const bool webvr);
 530   Maybe<layers::SurfaceDescriptor> GetFrontBuffer(WebGLFramebuffer*,
 531                                                   const bool webvr);
 532
 533   void ClearVRSwapChain();
 534
 535   void RunContextLossTimer();
 536   void CheckForContextLoss();
 537   void HandlePendingContextLoss();
 538
 539   bool TryToRestoreContext();
 540
 541   void AssertCachedBindings() const;
 542   void AssertCachedGlobalState() const;
 543
 544   // WebIDL WebGLRenderingContext API
 545   void Commit();
 546
 547   uvec2 DrawingBufferSize();
 548
 549  public:
 550   void GetContextAttributes(dom::Nullable<dom::WebGLContextAttributes>& retval);
 551
 552   // This is the entrypoint. Don't test against it directly.
 553   bool IsContextLost() const {
 554     auto* self = const_cast<WebGLContext*>(this);
 555     if (self->mPendingContextLoss.exchange(false)) {
 556       self->HandlePendingContextLoss();
 557     }
 558     return mIsContextLost;
 559   }
 560
 561   // -
 562
 563   RefPtr<WebGLBuffer> CreateBuffer();
 564   RefPtr<WebGLFramebuffer> CreateFramebuffer();
 565   RefPtr<WebGLFramebuffer> CreateOpaqueFramebuffer(
 566       const webgl::OpaqueFramebufferOptions& options);
 567   RefPtr<WebGLProgram> CreateProgram();
 568   RefPtr<WebGLQuery> CreateQuery();
 569   RefPtr<WebGLRenderbuffer> CreateRenderbuffer();
 570   RefPtr<WebGLShader> CreateShader(GLenum type);
 571   RefPtr<WebGLTexture> CreateTexture();
 572   RefPtr<WebGLVertexArray> CreateVertexArray();
 573
 574   // -
 575
 576   void AttachShader(WebGLProgram& prog, WebGLShader& shader);
 577   void BindAttribLocation(WebGLProgram& prog, GLuint location,
 578                           const std::string& name) const;
 579   void BindFramebuffer(GLenum target, WebGLFramebuffer* fb);
 580   void BindRenderbuffer(GLenum target, WebGLRenderbuffer* fb);
 581   void BindVertexArray(WebGLVertexArray* vao);
 582   void BlendColor(GLclampf r, GLclampf g, GLclampf b, GLclampf a);
 583   void BlendEquationSeparate(Maybe<GLuint> i, GLenum modeRGB, GLenum modeAlpha);
 584   void BlendFuncSeparate(Maybe<GLuint> i, GLenum srcRGB, GLenum dstRGB,
 585                          GLenum srcAlpha, GLenum dstAlpha);
 586   GLenum CheckFramebufferStatus(GLenum target);
 587   void Clear(GLbitfield mask);
 588   void ClearColor(GLclampf r, GLclampf g, GLclampf b, GLclampf a);
 589   void ClearDepth(GLclampf v);
 590   void ClearStencil(GLint v);
 591   void ColorMask(Maybe<GLuint> i, uint8_t mask);
 592   void CompileShader(WebGLShader& shader);
 593
 594  private:
 595   void CompileShaderANGLE(WebGLShader* shader);
 596   void CompileShaderBypass(WebGLShader* shader, const nsCString& shaderSource);
 597
 598  public:
 599   void CullFace(GLenum face);
 600   void DepthFunc(GLenum func);
 601   void DepthMask(WebGLboolean b);
 602   void DepthRange(GLclampf zNear, GLclampf zFar);
 603   void DetachShader(WebGLProgram& prog, const WebGLShader& shader);
 604   void DrawBuffers(const std::vector<GLenum>& buffers);
 605   void Flush();
 606   void Finish();
 607
 608   void FramebufferAttach(GLenum target, GLenum attachSlot,
 609                          GLenum bindImageTarget,
 610                          const webgl::FbAttachInfo& toAttach);
 611
 612   void FrontFace(GLenum mode);
 613
 614   Maybe<double> GetBufferParameter(GLenum target, GLenum pname);
 615   webgl::CompileResult GetCompileResult(const WebGLShader&) const;
 616   GLenum GetError();
 617   GLint GetFragDataLocation(const WebGLProgram&, const std::string& name) const;
 618
 619   Maybe<double> GetFramebufferAttachmentParameter(WebGLFramebuffer*,
 620                                                   GLenum attachment,
 621                                                   GLenum pname) const;
 622
 623   Maybe<double> GetRenderbufferParameter(const WebGLRenderbuffer&,
 624                                          GLenum pname) const;
 625   webgl::LinkResult GetLinkResult(const WebGLProgram&) const;
 626
 627   Maybe<webgl::ShaderPrecisionFormat> GetShaderPrecisionFormat(
 628       GLenum shadertype, GLenum precisiontype) const;
 629
 630   webgl::GetUniformData GetUniform(const WebGLProgram&, uint32_t loc) const;
 631
 632   void Hint(GLenum target, GLenum mode);
 633
 634   void LineWidth(GLfloat width);
 635   void LinkProgram(WebGLProgram& prog);
 636   void PolygonOffset(GLfloat factor, GLfloat units);
 637   void ProvokingVertex(webgl::ProvokingVertex) const;
 638
 639   ////
 640
 641   webgl::PackingInfo ValidImplementationColorReadPI(
 642       const webgl::FormatUsageInfo* usage) const;
 643
 644  protected:
 645   webgl::ReadPixelsResult ReadPixelsImpl(const webgl::ReadPixelsDesc&,
 646                                          uintptr_t dest, uint64_t availBytes);
 647   bool DoReadPixelsAndConvert(const webgl::FormatInfo* srcFormat,
 648                               const webgl::ReadPixelsDesc&, uintptr_t dest,
 649                               uint64_t dataLen, uint32_t rowStride);
 650
 651  public:
 652   void ReadPixelsPbo(const webgl::ReadPixelsDesc&, uint64_t offset);
 653   webgl::ReadPixelsResult ReadPixelsInto(const webgl::ReadPixelsDesc&,
 654                                          const Range<uint8_t>& dest);
 655
 656   ////
 657
 658   void RenderbufferStorageMultisample(WebGLRenderbuffer&, uint32_t samples,
 659                                       GLenum internalformat, uint32_t width,
 660                                       uint32_t height) const;
 661
 662  public:
 663   void SampleCoverage(GLclampf value, WebGLboolean invert);
 664   void Scissor(GLint x, GLint y, GLsizei width, GLsizei height);
 665   void ShaderSource(WebGLShader& shader, const std::string& source) const;
 666   void StencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask);
 667   void StencilMaskSeparate(GLenum face, GLuint mask);
 668   void StencilOpSeparate(GLenum face, GLenum sfail, GLenum dpfail,
 669                          GLenum dppass);
 670
 671   //////////////////////////
 672
 673   void UniformData(uint32_t loc, bool transpose,
 674                    const Range<const webgl::UniformDataVal>& data) const;
 675
 676   ////////////////////////////////////
 677
 678   void UseProgram(WebGLProgram* prog);
 679
 680   bool ValidateAttribArraySetter(uint32_t count, uint32_t arrayLength);
 681   bool ValidateProgram(const WebGLProgram& prog) const;
 682   void Viewport(GLint x, GLint y, GLsizei width, GLsizei height);
 683
 684   // -----------------------------------------------------------------------------
 685   // Buffer Objects (WebGLContextBuffers.cpp)
 686   void BindBuffer(GLenum target, WebGLBuffer* buffer);
 687   void BindBufferRange(GLenum target, GLuint index, WebGLBuffer* buf,
 688                        uint64_t offset, uint64_t size);
 689
 690   void BufferData(GLenum target, uint64_t dataLen, const uint8_t* data,
 691                   GLenum usage) const;
 692   // The unsynchronized flag may allow for better performance when
 693   // interleaving buffer updates with draw calls. However, care must
 694   // be taken. This has similar semantics to glMapBufferRange's
 695   // GL_MAP_UNSYNCHRONIZED_BIT: the results of any pending operations
 696   // that reference the region of the buffer being updated are
 697   // undefined.
 698   void BufferSubData(GLenum target, uint64_t dstByteOffset, uint64_t srcDataLen,
 699                      const uint8_t* srcData, bool unsynchronized = false) const;
 700
 701  protected:
 702   // bound buffer state
 703   RefPtr<WebGLBuffer> mBoundArrayBuffer;
 704   RefPtr<WebGLBuffer> mBoundCopyReadBuffer;
 705   RefPtr<WebGLBuffer> mBoundCopyWriteBuffer;
 706   RefPtr<WebGLBuffer> mBoundPixelPackBuffer;
 707   RefPtr<WebGLBuffer> mBoundPixelUnpackBuffer;
 708   RefPtr<WebGLBuffer> mBoundTransformFeedbackBuffer;
 709   RefPtr<WebGLBuffer> mBoundUniformBuffer;
 710
 711   std::vector<IndexedBufferBinding> mIndexedUniformBufferBindings;
 712
 713   RefPtr<WebGLBuffer>& GetBufferSlotByTarget(GLenum target);
 714   RefPtr<WebGLBuffer>& GetBufferSlotByTargetIndexed(GLenum target,
 715                                                     GLuint index);
 716
 717   // -
 718
 719   void GenErrorIllegalUse(GLenum useTarget, uint32_t useId, GLenum boundTarget,
 720                           uint32_t boundId) const;
 721
 722   bool ValidateBufferForNonTf(const WebGLBuffer&, GLenum nonTfTarget,
 723                               uint32_t nonTfId) const;
 724
 725   bool ValidateBufferForNonTf(const WebGLBuffer* const nonTfBuffer,
 726                               const GLenum nonTfTarget,
 727                               const uint32_t nonTfId = -1) const {
 728     if (!nonTfBuffer) return true;
 729     return ValidateBufferForNonTf(*nonTfBuffer, nonTfTarget, nonTfId);
 730   }
 731
 732   bool ValidateBuffersForTf(const WebGLTransformFeedback&,
 733                             const webgl::LinkedProgramInfo&) const;
 734   bool ValidateBuffersForTf(
 735       const std::vector<webgl::BufferAndIndex>& tfBuffers) const;
 736
 737   // -----------------------------------------------------------------------------
 738   // Queries (WebGL2ContextQueries.cpp)
 739  protected:
 740   RefPtr<WebGLQuery> mQuerySlot_SamplesPassed;
 741   RefPtr<WebGLQuery> mQuerySlot_TFPrimsWritten;
 742   RefPtr<WebGLQuery> mQuerySlot_TimeElapsed;
 743
 744   RefPtr<WebGLQuery>* ValidateQuerySlotByTarget(GLenum target);
 745
 746  public:
 747   void BeginQuery(GLenum target, WebGLQuery& query);
 748   void EndQuery(GLenum target);
 749   Maybe<double> GetQueryParameter(const WebGLQuery& query, GLenum pname) const;
 750   void QueryCounter(WebGLQuery&) const;
 751
 752   // -----------------------------------------------------------------------------
 753   // State and State Requests (WebGLContextState.cpp)
 754   void SetEnabled(GLenum cap, Maybe<GLuint> i, bool enabled);
 755   bool GetStencilBits(GLint* const out_stencilBits) const;
 756
 757   virtual Maybe<double> GetParameter(GLenum pname);
 758   Maybe<std::string> GetString(GLenum pname) const;
 759
 760   bool IsEnabled(GLenum cap);
 761
 762  private:
 763   static StaticMutex sLruMutex;
 764   static std::list<WebGLContext*> sLru MOZ_GUARDED_BY(sLruMutex);
 765
 766   // State tracking slots
 767   bool mDitherEnabled = true;
 768   bool mRasterizerDiscardEnabled = false;
 769   bool mScissorTestEnabled = false;
 770   bool mDepthTestEnabled = false;
 771   bool mStencilTestEnabled = false;
 772   GLenum mGenerateMipmapHint = LOCAL_GL_DONT_CARE;
 773
 774   struct ScissorRect final {
 775     GLint x;
 776     GLint y;
 777     GLsizei w;
 778     GLsizei h;
 779
 780     void Apply(gl::GLContext&) const;
 781   };
 782   ScissorRect mScissorRect = {};
 783
 784   bool ValidateCapabilityEnum(GLenum cap);
 785   bool* GetStateTrackingSlot(GLenum cap, GLuint i);
 786
 787   // Allocation debugging variables
 788   mutable uint64_t mDataAllocGLCallCount = 0;
 789
 790   void OnDataAllocCall() const { mDataAllocGLCallCount++; }
 791
 792   uint64_t GetNumGLDataAllocCalls() const { return mDataAllocGLCallCount; }
 793
 794   void OnEndOfFrame();
 795
 796   // -----------------------------------------------------------------------------
 797   // Texture funcions (WebGLContextTextures.cpp)
 798  public:
 799   void ActiveTexture(uint32_t texUnit);
 800   void BindTexture(GLenum texTarget, WebGLTexture* tex);
 801   void GenerateMipmap(GLenum texTarget);
 802
 803   Maybe<double> GetTexParameter(const WebGLTexture&, GLenum pname) const;
 804   void TexParameter_base(GLenum texTarget, GLenum pname,
 805                          const FloatOrInt& param);
 806
 807   virtual bool IsTexParamValid(GLenum pname) const;
 808
 809   ////////////////////////////////////
 810   // Uploads
 811
 812   // CompressedTexSubImage if `sub`
 813   void CompressedTexImage(bool sub, GLenum imageTarget, uint32_t level,
 814                           GLenum format, uvec3 offset, uvec3 size,
 815                           const Range<const uint8_t>& src,
 816                           const uint32_t pboImageSize,
 817                           const Maybe<uint64_t>& pboOffset) const;
 818
 819   // CopyTexSubImage if `!respectFormat`
 820   void CopyTexImage(GLenum imageTarget, uint32_t level, GLenum respecFormat,
 821                     uvec3 dstOffset, const ivec2& srcOffset,
 822                     const uvec2& size) const;
 823
 824   // TexSubImage if `!respectFormat`
 825   void TexImage(uint32_t level, GLenum respecFormat, uvec3 offset,
 826                 const webgl::PackingInfo& pi,
 827                 const webgl::TexUnpackBlobDesc&) const;
 828
 829   void TexStorage(GLenum texTarget, uint32_t levels, GLenum sizedFormat,
 830                   uvec3 size) const;
 831
 832   UniquePtr<webgl::TexUnpackBlob> ToTexUnpackBytes(
 833       const WebGLTexImageData& imageData);
 834
 835   UniquePtr<webgl::TexUnpackBytes> ToTexUnpackBytes(WebGLTexPboOffset& aPbo);
 836
 837   ////////////////////////////////////
 838   // WebGLTextureUpload.cpp
 839  protected:
 840   bool ValidateTexImageSpecification(uint8_t funcDims, GLenum texImageTarget,
 841                                      GLint level, GLsizei width, GLsizei height,
 842                                      GLsizei depth, GLint border,
 843                                      TexImageTarget* const out_target,
 844                                      WebGLTexture** const out_texture,
 845                                      webgl::ImageInfo** const out_imageInfo);
 846   bool ValidateTexImageSelection(uint8_t funcDims, GLenum texImageTarget,
 847                                  GLint level, GLint xOffset, GLint yOffset,
 848                                  GLint zOffset, GLsizei width, GLsizei height,
 849                                  GLsizei depth,
 850                                  TexImageTarget* const out_target,
 851                                  WebGLTexture** const out_texture,
 852                                  webgl::ImageInfo** const out_imageInfo);
 853   bool ValidateUnpackInfo(bool usePBOs, GLenum format, GLenum type,
 854                           webgl::PackingInfo* const out);
 855
 856   // -----------------------------------------------------------------------------
 857   // Vertices Feature (WebGLContextVertices.cpp)
 858   GLenum mPrimRestartTypeBytes = 0;
 859
 860  public:
 861   void DrawArraysInstanced(GLenum mode, GLint first, GLsizei vertexCount,
 862                            GLsizei instanceCount);
 863   void DrawElementsInstanced(GLenum mode, GLsizei vertexCount, GLenum type,
 864                              WebGLintptr byteOffset, GLsizei instanceCount);
 865
 866   void EnableVertexAttribArray(GLuint index);
 867   void DisableVertexAttribArray(GLuint index);
 868
 869   Maybe<double> GetVertexAttrib(GLuint index, GLenum pname);
 870
 871   ////
 872
 873   void VertexAttrib4T(GLuint index, const webgl::TypedQuad&);
 874
 875   ////
 876
 877   void VertexAttribPointer(uint32_t index, const webgl::VertAttribPointerDesc&);
 878
 879   void VertexAttribDivisor(GLuint index, GLuint divisor);
 880
 881  private:
 882   WebGLBuffer* DrawElements_check(GLsizei indexCount, GLenum type,
 883                                   WebGLintptr byteOffset,
 884                                   GLsizei instanceCount);
 885   void Draw_cleanup();
 886
 887   void VertexAttrib1fv_base(GLuint index, uint32_t arrayLength,
 888                             const GLfloat* ptr);
 889   void VertexAttrib2fv_base(GLuint index, uint32_t arrayLength,
 890                             const GLfloat* ptr);
 891   void VertexAttrib3fv_base(GLuint index, uint32_t arrayLength,
 892                             const GLfloat* ptr);
 893   void VertexAttrib4fv_base(GLuint index, uint32_t arrayLength,
 894                             const GLfloat* ptr);
 895
 896   bool BindArrayAttribToLocation0(WebGLProgram* prog);
 897
 898   // -----------------------------------------------------------------------------
 899   // PROTECTED
 900  protected:
 901   WebGLVertexAttrib0Status WhatDoesVertexAttrib0Need() const;
 902   bool DoFakeVertexAttrib0(uint64_t fakeVertexCount,
 903                            WebGLVertexAttrib0Status whatDoesAttrib0Need);
 904   void UndoFakeVertexAttrib0();
 905
 906   bool mResetLayer = true;
 907   bool mOptionsFrozen = false;
 908   bool mIsMesa = false;
 909   bool mLoseContextOnMemoryPressure = false;
 910   bool mCanLoseContextInForeground = true;
 911   bool mShouldPresent = false;
 912   bool mDisableFragHighP = false;
 913   bool mForceResizeOnPresent = false;
 914   bool mVRReady = false;
 915
 916   template <typename WebGLObjectType>
 917   void DeleteWebGLObjectsArray(nsTArray<WebGLObjectType>& array);
 918
 919   GLuint mActiveTexture = 0;
 920   GLenum mDefaultFB_DrawBuffer0 = LOCAL_GL_BACK;
 921   GLenum mDefaultFB_ReadBuffer = LOCAL_GL_BACK;
 922
 923   mutable GLenum mWebGLError = 0;
 924
 925   std::unique_ptr<webgl::ShaderValidator> CreateShaderValidator(
 926       GLenum shaderType) const;
 927
 928   // some GL constants
 929   uint32_t mGLMaxFragmentUniformVectors = 0;
 930   uint32_t mGLMaxVertexUniformVectors = 0;
 931   uint32_t mGLMaxVertexOutputVectors = 0;
 932   uint32_t mGLMaxFragmentInputVectors = 0;
 933
 934   uint32_t mGLMaxVertexTextureImageUnits = 0;
 935   uint32_t mGLMaxFragmentTextureImageUnits = 0;
 936   uint32_t mGLMaxCombinedTextureImageUnits = 0;
 937
 938   // ES3:
 939   uint32_t mGLMinProgramTexelOffset = 0;
 940   uint32_t mGLMaxProgramTexelOffset = 0;
 941
 942  public:
 943   auto GLMaxDrawBuffers() const { return mLimits->maxColorDrawBuffers; }
 944
 945   uint32_t MaxValidDrawBuffers() const {
 946     if (IsWebGL2() ||
 947         IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers)) {
 948       return GLMaxDrawBuffers();
 949     }
 950     return 1;
 951   }
 952
 953   GLenum LastColorAttachmentEnum() const {
 954     return LOCAL_GL_COLOR_ATTACHMENT0 + MaxValidDrawBuffers() - 1;
 955   }
 956
 957   const auto& Options() const { return mOptions; }
 958
 959  protected:
 960   uint32_t mGLMaxRenderbufferSize = 0;
 961
 962  public:
 963   const auto& Limits() const { return *mLimits; }
 964   auto MaxVertexAttribs() const { return mLimits->maxVertexAttribs; }
 965   auto GLMaxTextureUnits() const { return mLimits->maxTexUnits; }
 966
 967   bool IsFormatValidForFB(TexInternalFormat format) const;
 968
 969  protected:
 970   // -------------------------------------------------------------------------
 971   // WebGL extensions (implemented in WebGLContextExtensions.cpp)
 972
 973   EnumeratedArray<WebGLExtensionID, WebGLExtensionID::Max,
 974                   std::unique_ptr<WebGLExtensionBase>>
 975       mExtensions;
 976
 977  public:
 978   void RequestExtension(WebGLExtensionID, bool explicitly = true);
 979
 980   // returns true if the extension has been enabled by calling getExtension.
 981   bool IsExtensionEnabled(const WebGLExtensionID id) const {
 982     return bool(mExtensions[id]);
 983   }
 984
 985   bool IsExtensionExplicit(WebGLExtensionID) const;
 986   void WarnIfImplicit(WebGLExtensionID) const;
 987
 988   bool IsExtensionSupported(WebGLExtensionID) const;
 989
 990   // -------------------------------------------------------------------------
 991   // WebGL 2 specifics (implemented in WebGL2Context.cpp)
 992  public:
 993   virtual bool IsWebGL2() const { return false; }
 994
 995   struct FailureReason {
 996     nsCString key;  // For reporting.
 997     nsCString info;
 998
 999     FailureReason() = default;
1000
1001     template <typename A, typename B>
1002     FailureReason(const A& _key, const B& _info)
1003         : key(nsCString(_key)), info(nsCString(_info)) {}
1004   };
1005
1006  protected:
1007   bool InitWebGL2(FailureReason* const out_failReason);
1008
1009   bool CreateAndInitGL(bool forceEnabled,
1010                        std::vector<FailureReason>* const out_failReasons);
1011
1012   // -------------------------------------------------------------------------
1013   // Validation functions (implemented in WebGLContextValidate.cpp)
1014   bool InitAndValidateGL(FailureReason* const out_failReason);
1015
1016   bool ValidateBlendEquationEnum(GLenum cap, const char* info);
1017   bool ValidateBlendFuncEnumsCompatibility(GLenum sfactor, GLenum dfactor,
1018                                            const char* info);
1019   bool ValidateStencilOpEnum(GLenum action, const char* info);
1020   bool ValidateFaceEnum(GLenum face);
1021   bool ValidateTexInputData(GLenum type, js::Scalar::Type jsArrayType,
1022                             WebGLTexImageFunc func, WebGLTexDimensions dims);
1023   bool ValidateAttribPointer(bool integerMode, GLuint index, GLint size,
1024                              GLenum type, WebGLboolean normalized,
1025                              GLsizei stride, WebGLintptr byteOffset,
1026                              const char* info);
1027   bool ValidateStencilParamsForDrawCall() const;
1028
1029   bool ValidateCopyTexImage(TexInternalFormat srcFormat,
1030                             TexInternalFormat dstformat, WebGLTexImageFunc func,
1031                             WebGLTexDimensions dims);
1032
1033   bool ValidateTexImage(TexImageTarget texImageTarget, GLint level,
1034                         GLenum internalFormat, GLint xoffset, GLint yoffset,
1035                         GLint zoffset, GLint width, GLint height, GLint depth,
1036                         GLint border, GLenum format, GLenum type,
1037                         WebGLTexImageFunc func, WebGLTexDimensions dims);
1038   bool ValidateTexImageFormat(GLenum internalFormat, WebGLTexImageFunc func,
1039                               WebGLTexDimensions dims);
1040   bool ValidateTexImageType(GLenum type, WebGLTexImageFunc func,
1041                             WebGLTexDimensions dims);
1042   bool ValidateTexImageFormatAndType(GLenum format, GLenum type,
1043                                      WebGLTexImageFunc func,
1044                                      WebGLTexDimensions dims);
1045   bool ValidateCompTexImageInternalFormat(GLenum format, WebGLTexImageFunc func,
1046                                           WebGLTexDimensions dims);
1047   bool ValidateCopyTexImageInternalFormat(GLenum format, WebGLTexImageFunc func,
1048                                           WebGLTexDimensions dims);
1049   bool ValidateTexImageSize(TexImageTarget texImageTarget, GLint level,
1050                             GLint width, GLint height, GLint depth,
1051                             WebGLTexImageFunc func, WebGLTexDimensions dims);
1052   bool ValidateTexSubImageSize(GLint x, GLint y, GLint z, GLsizei width,
1053                                GLsizei height, GLsizei depth, GLsizei baseWidth,
1054                                GLsizei baseHeight, GLsizei baseDepth,
1055                                WebGLTexImageFunc func, WebGLTexDimensions dims);
1056   bool ValidateCompTexImageSize(GLint level, GLenum internalFormat,
1057                                 GLint xoffset, GLint yoffset, GLsizei width,
1058                                 GLsizei height, GLsizei levelWidth,
1059                                 GLsizei levelHeight, WebGLTexImageFunc func,
1060                                 WebGLTexDimensions dims);
1061   bool ValidateCompTexImageDataSize(GLint level, GLenum internalFormat,
1062                                     GLsizei width, GLsizei height,
1063                                     uint32_t byteLength, WebGLTexImageFunc func,
1064                                     WebGLTexDimensions dims);
1065
1066   bool HasDrawBuffers() const {
1067     return IsWebGL2() ||
1068            IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers);
1069   }
1070
1071   RefPtr<WebGLBuffer>* ValidateBufferSlot(GLenum target);
1072
1073  public:
1074   WebGLBuffer* ValidateBufferSelection(GLenum target) const;
1075
1076  protected:
1077   IndexedBufferBinding* ValidateIndexedBufferSlot(GLenum target, GLuint index);
1078
1079   bool ValidateIndexedBufferBinding(
1080       GLenum target, GLuint index,
1081       RefPtr<WebGLBuffer>** const out_genericBinding,
1082       IndexedBufferBinding** const out_indexedBinding);
1083
1084  public:
1085   bool ValidateNonNegative(const char* argName, int64_t val) const {
1086     if (MOZ_UNLIKELY(val < 0)) {
1087       ErrorInvalidValue("`%s` must be non-negative.", argName);
1088       return false;
1089     }
1090     return true;
1091   }
1092
1093   template <typename T>
1094   bool ValidateNonNull(const char* const argName,
1095                        const dom::Nullable<T>& maybe) const {
1096     if (maybe.IsNull()) {
1097       ErrorInvalidValue("%s: Cannot be null.", argName);
1098       return false;
1099     }
1100     return true;
1101   }
1102
1103   ////
1104
1105  protected:
1106   void DestroyResourcesAndContext();
1107
1108   // helpers
1109
1110   bool ConvertImage(size_t width, size_t height, size_t srcStride,
1111                     size_t dstStride, const uint8_t* src, uint8_t* dst,
1112                     WebGLTexelFormat srcFormat, bool srcPremultiplied,
1113                     WebGLTexelFormat dstFormat, bool dstPremultiplied,
1114                     size_t dstTexelSize);
1115
1116   //////
1117  public:
1118   template <typename T>
1119   bool ValidateObject(const char* const argName, const T& object) const {
1120     // Todo: Remove all callers.
1121     return true;
1122   }
1123
1124   template <typename T>
1125   bool ValidateObject(const char* const argName, const T* const object) const {
1126     // Todo: Remove most (all?) callers.
1127     if (!object) {
1128       ErrorInvalidOperation(
1129           "%s: Object argument cannot have been marked for"
1130           " deletion.",
1131           argName);
1132       return false;
1133     }
1134     return true;
1135   }
1136
1137   ////
1138
1139  private:
1140   void LoseContextLruLocked(webgl::ContextLossReason reason)
1141       MOZ_REQUIRES(sLruMutex);
1142
1143  public:
1144   void LoseContext(
1145       webgl::ContextLossReason reason = webgl::ContextLossReason::None);
1146
1147  protected:
1148   nsTArray<RefPtr<WebGLTexture>> mBound2DTextures;
1149   nsTArray<RefPtr<WebGLTexture>> mBoundCubeMapTextures;
1150   nsTArray<RefPtr<WebGLTexture>> mBound3DTextures;
1151   nsTArray<RefPtr<WebGLTexture>> mBound2DArrayTextures;
1152   nsTArray<RefPtr<WebGLSampler>> mBoundSamplers;
1153
1154   void ResolveTexturesForDraw() const;
1155
1156   RefPtr<WebGLProgram> mCurrentProgram;
1157   RefPtr<const webgl::LinkedProgramInfo> mActiveProgramLinkInfo;
1158
1159   bool ValidateFramebufferTarget(GLenum target) const;
1160   bool ValidateInvalidateFramebuffer(GLenum target,
1161                                      const Range<const GLenum>& attachments,
1162                                      std::vector<GLenum>* const scopedVector,
1163                                      GLsizei* const out_glNumAttachments,
1164                                      const GLenum** const out_glAttachments);
1165
1166   RefPtr<WebGLFramebuffer> mBoundDrawFramebuffer;
1167   RefPtr<WebGLFramebuffer> mBoundReadFramebuffer;
1168   RefPtr<WebGLTransformFeedback> mBoundTransformFeedback;
1169   RefPtr<WebGLVertexArray> mBoundVertexArray;
1170
1171  public:
1172   const auto& BoundReadFb() const { return mBoundReadFramebuffer; }
1173
1174  protected:
1175   RefPtr<WebGLTransformFeedback> mDefaultTransformFeedback;
1176   RefPtr<WebGLVertexArray> mDefaultVertexArray;
1177
1178   ////////////////////////////////////
1179
1180  protected:
1181   GLuint mEmptyTFO = 0;
1182
1183   // Generic Vertex Attributes
1184   // Though CURRENT_VERTEX_ATTRIB is listed under "Vertex Shader State" in the
1185   // spec state tables, this isn't vertex shader /object/ state. This array is
1186   // merely state useful to vertex shaders, but is global state.
1187   std::vector<webgl::AttribBaseType> mGenericVertexAttribTypes;
1188   CacheInvalidator mGenericVertexAttribTypeInvalidator;
1189
1190   GLuint mFakeVertexAttrib0BufferObject = 0;
1191   intptr_t mFakeVertexAttrib0BufferObjectSize = 0;
1192   bool mFakeVertexAttrib0DataDefined = false;
1193   alignas(alignof(float)) uint8_t
1194       mGenericVertexAttrib0Data[sizeof(float) * 4] = {};
1195   alignas(alignof(float)) uint8_t
1196       mFakeVertexAttrib0Data[sizeof(float) * 4] = {};
1197
1198   GLint mStencilRefFront = 0;
1199   GLint mStencilRefBack = 0;
1200   GLuint mStencilValueMaskFront = 0;
1201   GLuint mStencilValueMaskBack = 0;
1202   GLuint mStencilWriteMaskFront = 0;
1203   GLuint mStencilWriteMaskBack = 0;
1204   uint8_t mColorWriteMask0 = 0xf;  // bitmask
1205   mutable uint8_t mDriverColorMask0 = 0xf;
1206   bool mDepthWriteMask = true;
1207   GLfloat mColorClearValue[4] = {0, 0, 0, 0};
1208   GLint mStencilClearValue = 0;
1209   GLfloat mDepthClearValue = 1.0f;
1210
1211   std::bitset<webgl::kMaxDrawBuffers> mColorWriteMaskNonzero = -1;
1212   std::bitset<webgl::kMaxDrawBuffers> mBlendEnabled = 0;
1213
1214   GLint mViewportX = 0;
1215   GLint mViewportY = 0;
1216   GLsizei mViewportWidth = 0;
1217   GLsizei mViewportHeight = 0;
1218   bool mAlreadyWarnedAboutViewportLargerThanDest = false;
1219
1220   GLfloat mLineWidth = 1.0;
1221
1222   WebGLContextLossHandler mContextLossHandler;
1223
1224   // Used for some hardware (particularly Tegra 2 and 4) that likes to
1225   // be Flushed while doing hundreds of draw calls.
1226   mutable uint64_t mDrawCallsSinceLastFlush = 0;
1227
1228   mutable uint64_t mWarningCount = 0;
1229   const uint64_t mMaxWarnings;
1230   bool mAlreadyWarnedAboutFakeVertexAttrib0 = false;
1231
1232   bool ShouldGenerateWarnings() const { return mWarningCount < mMaxWarnings; }
1233
1234   bool ShouldGeneratePerfWarnings() const {
1235     return mNumPerfWarnings < mMaxPerfWarnings;
1236   }
1237
1238   bool mNeedsFakeNoAlpha = false;
1239   bool mNeedsFakeNoDepth = false;
1240   bool mNeedsFakeNoStencil = false;
1241
1242   bool mDriverDepthTest = false;
1243   bool mDriverStencilTest = false;
1244
1245   bool mNeedsLegacyVertexAttrib0Handling = false;
1246   bool mMaybeNeedsLegacyVertexAttrib0Handling = false;
1247   bool mNeedsIndexValidation = false;
1248   bool mBug_DrawArraysInstancedUserAttribFetchAffectedByFirst = false;
1249
1250   const bool mAllowFBInvalidation;
1251
1252   bool Has64BitTimestamps() const;
1253
1254   // --
1255
1256   const uint8_t mMsaaSamples;
1257   mutable uvec2 mRequestedSize;
1258   mutable UniquePtr<gl::MozFramebuffer> mDefaultFB;
1259   mutable bool mDefaultFB_IsInvalid = false;
1260   mutable UniquePtr<gl::MozFramebuffer> mResolvedDefaultFB;
1261
1262   gl::SwapChain mSwapChain;
1263   gl::SwapChain mWebVRSwapChain;
1264
1265   RefPtr<layers::RemoteTextureOwnerClient> mRemoteTextureOwner;
1266
1267   bool PushRemoteTexture(WebGLFramebuffer*, gl::SwapChain&,
1268                          std::shared_ptr<gl::SharedSurface>,
1269                          const webgl::SwapChainOptions& options);
1270
1271   // --
1272
1273   bool EnsureDefaultFB();
1274   bool ValidateAndInitFB(
1275       const WebGLFramebuffer* fb,
1276       GLenum incompleteFbError = LOCAL_GL_INVALID_FRAMEBUFFER_OPERATION);
1277   void DoBindFB(const WebGLFramebuffer* fb,
1278                 GLenum target = LOCAL_GL_FRAMEBUFFER) const;
1279
1280   bool BindCurFBForDraw();
1281   bool BindCurFBForColorRead(
1282       const webgl::FormatUsageInfo** out_format, uint32_t* out_width,
1283       uint32_t* out_height,
1284       GLenum incompleteFbError = LOCAL_GL_INVALID_FRAMEBUFFER_OPERATION);
1285   void DoColorMask(Maybe<GLuint> i, uint8_t bitmask) const;
1286   void BlitBackbufferToCurDriverFB(
1287       WebGLFramebuffer* const srcAsWebglFb = nullptr,
1288       const gl::MozFramebuffer* const srcAsMozFb = nullptr,
1289       bool srcIsBGRA = false) const;
1290   bool BindDefaultFBForRead();
1291
1292   // --
1293
1294  public:
1295   // console logging helpers
1296   template <typename... Args>
1297   void GenerateWarning(const char* const fmt, const Args&... args) const {
1298     GenerateError(0, fmt, args...);
1299   }
1300
1301   template <typename... Args>
1302   void GeneratePerfWarning(const char* const fmt, const Args&... args) const {
1303     GenerateError(webgl::kErrorPerfWarning, fmt, args...);
1304   }
1305
1306  public:
1307   UniquePtr<webgl::FormatUsageAuthority> mFormatUsage;
1308
1309   virtual UniquePtr<webgl::FormatUsageAuthority> CreateFormatUsage(
1310       gl::GLContext* gl) const;
1311
1312   const decltype(mBound2DTextures)* TexListForElemType(GLenum elemType) const;
1313
1314   // Friend list
1315   friend class ScopedCopyTexImageSource;
1316   friend class ScopedResolveTexturesForDraw;
1317   friend class webgl::TexUnpackBlob;
1318   friend class webgl::TexUnpackBytes;
1319   friend class webgl::TexUnpackImage;
1320   friend class webgl::TexUnpackSurface;
1321   friend struct webgl::UniformInfo;
1322   friend class WebGLTexture;
1323   friend class WebGLFBAttachPoint;
1324   friend class WebGLFramebuffer;
1325   friend class WebGLRenderbuffer;
1326   friend class WebGLProgram;
1327   friend class WebGLQuery;
1328   friend class WebGLBuffer;
1329   friend class WebGLSampler;
1330   friend class WebGLShader;
1331   friend class WebGLSync;
1332   friend class WebGLTransformFeedback;
1333   friend class WebGLVertexArray;
1334   friend class WebGLVertexArrayFake;
1335   friend class WebGLVertexArrayGL;
1336 };
1337
1338 // Returns `value` rounded to the next highest multiple of `multiple`.
1339 // AKA PadToAlignment, StrideForAlignment.
1340 template <typename V, typename M>
1341 V RoundUpToMultipleOf(const V& value, const M& multiple) {
1342   return ((value + multiple - 1) / multiple) * multiple;
1343 }
1344
1345 class ScopedFBRebinder final {
1346  private:
1347   const WebGLContext* const mWebGL;
1348
1349  public:
1350   explicit ScopedFBRebinder(const WebGLContext* const webgl) : mWebGL(webgl) {}
1351   ~ScopedFBRebinder();
1352 };
1353
1354 // -
1355
1356 constexpr inline bool IsBufferTargetLazilyBound(const GLenum target) {
1357   return target != LOCAL_GL_ELEMENT_ARRAY_BUFFER;
1358 }
1359
1360 void DoBindBuffer(gl::GLContext&, GLenum target, const WebGLBuffer*);
1361
1362 class ScopedLazyBind final {
1363  private:
1364   gl::GLContext& mGL;
1365   const GLenum mTarget;
1366
1367  public:
1368   ScopedLazyBind(gl::GLContext* const gl, const GLenum target,
1369                  const WebGLBuffer* const buf)
1370       : mGL(*gl), mTarget(IsBufferTargetLazilyBound(target) ? target : 0) {
1371     if (mTarget) {
1372       DoBindBuffer(mGL, mTarget, buf);
1373     }
1374   }
1375
1376   ~ScopedLazyBind() {
1377     if (mTarget) {
1378       DoBindBuffer(mGL, mTarget, nullptr);
1379     }
1380   }
1381 };
1382
1383 ////
1384
1385 bool Intersect(int32_t srcSize, int32_t read0, int32_t readSize,
1386                int32_t* out_intRead0, int32_t* out_intWrite0,
1387                int32_t* out_intSize);
1388
1389 uint64_t AvailGroups(uint64_t totalAvailItems, uint64_t firstItemOffset,
1390                      uint32_t groupSize, uint32_t groupStride);
1391
1392 ////
1393
1394 class ScopedDrawCallWrapper final {
1395  public:
1396   WebGLContext& mWebGL;
1397
1398   explicit ScopedDrawCallWrapper(WebGLContext& webgl);
1399   ~ScopedDrawCallWrapper();
1400 };
1401
1402 namespace webgl {
1403
1404 class ScopedPrepForResourceClear final {
1405   const WebGLContext& webgl;
1406
1407  public:
1408   explicit ScopedPrepForResourceClear(const WebGLContext&);
1409   ~ScopedPrepForResourceClear();
1410 };
1411
1412 struct IndexedName final {
1413   std::string name;
1414   uint64_t index;
1415 };
1416 Maybe<IndexedName> ParseIndexed(const std::string& str);
1417
1418 }  // namespace webgl
1419
1420 webgl::LinkActiveInfo GetLinkActiveInfo(
1421     gl::GLContext& gl, const GLuint prog, const bool webgl2,
1422     const std::unordered_map<std::string, std::string>& nameUnmap);
1423
1424 }  // namespace mozilla
1425
1426 #endif