1 files changed, 114 insertions, 0 deletions
diff --git a/gfx/gl/WGLLibrary.h b/gfx/gl/WGLLibrary.h
new file mode 100644
index 0000000000..82c764b3db
--- /dev/null
+++ b/gfx/gl/WGLLibrary.h
@@ -0,0 +1,114 @@
+/* -*- Mode: C++; tab-width: 20; 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/. */
+
+#include "GLContextTypes.h"
+#include "GLLibraryLoader.h"
+#include "mozilla/UniquePtr.h"
+#include <windows.h>
+
+struct PRLibrary;
+
+namespace mozilla {
+namespace gl {
+/*
+struct ScopedDC
+{
+    const HDC mDC;
+
+    ScopedDC() = delete;
+    virtual ~ScopedDC() = 0;
+};
+
+struct WindowDC final : public ScopedDC
+{
+    const HWND mWindow;
+
+    WindowDC() = delete;
+    ~WindowDC();
+};
+
+struct PBufferDC final : public ScopedDC
+{
+    const HWND mWindow;
+
+    PBufferDC() = delete;
+    ~PBufferDC();
+};
+*/
+class WGLLibrary {
+ public:
+  ~WGLLibrary() { Reset(); }
+
+ private:
+  void Reset();
+
+ public:
+  struct {
+    HGLRC(GLAPIENTRY* fCreateContext)(HDC);
+    BOOL(GLAPIENTRY* fDeleteContext)(HGLRC);
+    BOOL(GLAPIENTRY* fMakeCurrent)(HDC, HGLRC);
+    PROC(GLAPIENTRY* fGetProcAddress)(LPCSTR);
+    HGLRC(GLAPIENTRY* fGetCurrentContext)(void);
+    HDC(GLAPIENTRY* fGetCurrentDC)(void);
+    // BOOL   (GLAPIENTRY * fShareLists) (HGLRC oldContext, HGLRC newContext);
+    HANDLE(GLAPIENTRY* fCreatePbuffer)
+    (HDC hDC, int iPixelFormat, int iWidth, int iHeight,
+     const int* piAttribList);
+    BOOL(GLAPIENTRY* fDestroyPbuffer)(HANDLE hPbuffer);
+    HDC(GLAPIENTRY* fGetPbufferDC)(HANDLE hPbuffer);
+    int(GLAPIENTRY* fReleasePbufferDC)(HANDLE hPbuffer, HDC dc);
+    // BOOL (GLAPIENTRY * fBindTexImage) (HANDLE hPbuffer, int iBuffer);
+    // BOOL (GLAPIENTRY * fReleaseTexImage) (HANDLE hPbuffer, int iBuffer);
+    BOOL(GLAPIENTRY* fChoosePixelFormat)
+    (HDC hdc, const int* piAttribIList, const FLOAT* pfAttribFList,
+     UINT nMaxFormats, int* piFormats, UINT* nNumFormats);
+    // BOOL (GLAPIENTRY * fGetPixelFormatAttribiv) (HDC hdc,
+    //                                             int iPixelFormat,
+    //                                             int iLayerPlane,
+    //                                             UINT nAttributes,
+    //                                             int* piAttributes,
+    //                                             int* piValues);
+    const char*(GLAPIENTRY* fGetExtensionsStringARB)(HDC hdc);
+    HGLRC(GLAPIENTRY* fCreateContextAttribsARB)
+    (HDC hdc, HGLRC hShareContext, const int* attribList);
+    // WGL_NV_DX_interop:
+    BOOL(GLAPIENTRY* fDXSetResourceShareHandleNV)
+    (void* dxObject, HANDLE shareHandle);
+    HANDLE(GLAPIENTRY* fDXOpenDeviceNV)(void* dxDevice);
+    BOOL(GLAPIENTRY* fDXCloseDeviceNV)(HANDLE hDevice);
+    HANDLE(GLAPIENTRY* fDXRegisterObjectNV)
+    (HANDLE hDevice, void* dxObject, GLuint name, GLenum type, GLenum access);
+    BOOL(GLAPIENTRY* fDXUnregisterObjectNV)(HANDLE hDevice, HANDLE hObject);
+    BOOL(GLAPIENTRY* fDXObjectAccessNV)(HANDLE hObject, GLenum access);
+    BOOL(GLAPIENTRY* fDXLockObjectsNV)
+    (HANDLE hDevice, GLint count, HANDLE* hObjects);
+    BOOL(GLAPIENTRY* fDXUnlockObjectsNV)
+    (HANDLE hDevice, GLint count, HANDLE* hObjects);
+  } mSymbols = {};
+
+  bool EnsureInitialized();
+  // UniquePtr<WindowDC> CreateDummyWindow();
+  HGLRC CreateContextWithFallback(HDC dc, bool tryRobustBuffers) const;
+
+  bool HasDXInterop2() const { return bool(mSymbols.fDXOpenDeviceNV); }
+  bool IsInitialized() const { return mInitialized; }
+  auto GetOGLLibrary() const { return mOGLLibrary; }
+  auto RootDc() const { return mRootDc; }
+  SymbolLoader GetSymbolLoader() const;
+
+ private:
+  bool mInitialized = false;
+  PRLibrary* mOGLLibrary;
+  bool mHasRobustness;
+  HWND mDummyWindow;
+  HDC mRootDc;
+  HGLRC mDummyGlrc;
+};
+
+// a global WGLLibrary instance
+extern WGLLibrary sWGLLib;
+
+} /* namespace gl */
+} /* namespace mozilla */