GPUBackend: Add new GPUBackend object to manage GL object allocations

This just set a global object responsible for allocating new objects
in a thread safe way without needing any GPUContext bound to this
thread.

This also introduce the GLContext which will contain all the GL related
functions for the current context.

1 files changed, 53 insertions, 0 deletions

diff --git a/source/blender/gpu/opengl/gl_context.cc b/source/blender/gpu/opengl/gl_context.cc
new file mode 100644
index 00000000000..9fe283131fd
--- /dev/null
+++ b/source/blender/gpu/opengl/gl_context.cc
@@ -0,0 +1,53 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright 2020, Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup gpu
+ */
+
+#include "BLI_assert.h"
+#include "BLI_utildefines.h"
+
+#include "GPU_framebuffer.h"
+
+#include "GHOST_C-api.h"
+
+#include "gpu_context_private.h"
+
+#include "gl_context.hh"
+
+// TODO(fclem) this requires too much refactor for now.
+// using namespace blender::gpu;
+
+/* -------------------------------------------------------------------- */
+/** \name Constructor / Destructor
+ * \{ */
+
+GLContext::GLContext(void *ghost_window) : GPUContext()
+{
+  default_framebuffer_ = ghost_window ?
+                             GHOST_GetDefaultOpenGLFramebuffer((GHOST_WindowHandle)ghost_window) :
+                             0;
+}
+
+GLContext::~GLContext()
+{
+}
+
+/** \} */