dom/canvas/WebGLTransformFeedback.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 WEBGL_TRANSFORM_FEEDBACK_H_
   7 #define WEBGL_TRANSFORM_FEEDBACK_H_
   8
   9 #include "WebGLContext.h"
  10 #include "WebGLObjectModel.h"
  11
  12 namespace mozilla {
  13 namespace webgl {
  14 struct CachedDrawFetchLimits;
  15 }
  16
  17 class WebGLTransformFeedback final : public WebGLContextBoundObject {
  18   friend class ScopedDrawWithTransformFeedback;
  19   friend class WebGLContext;
  20   friend class WebGL2Context;
  21   friend class WebGLProgram;
  22
  23   MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(WebGLTransformFeedback, override)
  24
  25   friend const webgl::CachedDrawFetchLimits* ValidateDraw(WebGLContext*, GLenum,
  26                                                           uint32_t);
  27
  28  public:
  29   const GLuint mGLName;
  30   bool mHasBeenBound = false;
  31
  32  private:
  33   // GLES 3.0.4 p267, Table 6.24 "Transform Feedback State"
  34   // It's not yet in the ES3 spec, but the generic TF buffer bind point has been
  35   // moved to context state, instead of TFO state.
  36   std::vector<IndexedBufferBinding> mIndexedBindings;
  37   bool mIsPaused;
  38   bool mIsActive;
  39   // Not in state tables:
  40   RefPtr<WebGLProgram> mActive_Program;
  41   MOZ_INIT_OUTSIDE_CTOR GLenum mActive_PrimMode;
  42   MOZ_INIT_OUTSIDE_CTOR size_t mActive_VertPosition;
  43   MOZ_INIT_OUTSIDE_CTOR size_t mActive_VertCapacity;
  44
  45  public:
  46   WebGLTransformFeedback(WebGLContext* webgl, GLuint tf);
  47
  48  private:
  49   ~WebGLTransformFeedback() override;
  50
  51  public:
  52   bool IsActiveAndNotPaused() const { return mIsActive && !mIsPaused; }
  53
  54   // GL Funcs
  55   void BeginTransformFeedback(GLenum primMode);
  56   void EndTransformFeedback();
  57   void PauseTransformFeedback();
  58   void ResumeTransformFeedback();
  59 };
  60
  61 }  // namespace mozilla
  62
  63 #endif  // WEBGL_TRANSFORM_FEEDBACK_H_