1 files changed, 63 insertions, 0 deletions
diff --git a/dom/canvas/WebGLTransformFeedback.h b/dom/canvas/WebGLTransformFeedback.h
new file mode 100644
index 0000000000..a718c84f34
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+++ b/dom/canvas/WebGLTransformFeedback.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef WEBGL_TRANSFORM_FEEDBACK_H_
+#define WEBGL_TRANSFORM_FEEDBACK_H_
+
+#include "WebGLObjectModel.h"
+#include "WebGLTypes.h"
+
+namespace mozilla {
+namespace webgl {
+struct CachedDrawFetchLimits;
+}
+
+class WebGLTransformFeedback final : public WebGLContextBoundObject {
+  friend class ScopedDrawWithTransformFeedback;
+  friend class WebGLContext;
+  friend class WebGL2Context;
+  friend class WebGLProgram;
+
+  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(WebGLTransformFeedback, override)
+
+  friend const webgl::CachedDrawFetchLimits* ValidateDraw(WebGLContext*, GLenum,
+                                                          uint32_t);
+
+ public:
+  const GLuint mGLName;
+  bool mHasBeenBound = false;
+
+ private:
+  // GLES 3.0.4 p267, Table 6.24 "Transform Feedback State"
+  // It's not yet in the ES3 spec, but the generic TF buffer bind point has been
+  // moved to context state, instead of TFO state.
+  std::vector<IndexedBufferBinding> mIndexedBindings;
+  bool mIsPaused;
+  bool mIsActive;
+  // Not in state tables:
+  RefPtr<WebGLProgram> mActive_Program;
+  MOZ_INIT_OUTSIDE_CTOR GLenum mActive_PrimMode;
+  MOZ_INIT_OUTSIDE_CTOR size_t mActive_VertPosition;
+  MOZ_INIT_OUTSIDE_CTOR size_t mActive_VertCapacity;
+
+ public:
+  WebGLTransformFeedback(WebGLContext* webgl, GLuint tf);
+
+ private:
+  ~WebGLTransformFeedback() override;
+
+ public:
+  bool IsActiveAndNotPaused() const { return mIsActive && !mIsPaused; }
+
+  // GL Funcs
+  void BeginTransformFeedback(GLenum primMode);
+  void EndTransformFeedback();
+  void PauseTransformFeedback();
+  void ResumeTransformFeedback();
+};
+
+}  // namespace mozilla
+
+#endif  // WEBGL_TRANSFORM_FEEDBACK_H_