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.

# Conflicts:
#	source/blender/gpu/intern/gpu_context.cc

1 files changed, 22 insertions, 1 deletions

diff --git a/source/blender/gpu/opengl/gl_backend.hh b/source/blender/gpu/opengl/gl_backend.hh
index 25400a55394..f7c01b2f184 100644
--- a/source/blender/gpu/opengl/gl_backend.hh
+++ b/source/blender/gpu/opengl/gl_backend.hh
@@ -25,12 +25,33 @@
 
 #include "gpu_backend.hh"
 
+#include "BLI_vector.hh"
+
 #include "gl_context.hh"
 
+namespace blender {
+namespace gpu {
+
 class GLBackend : public GPUBackend {
+ private:
+  GLSharedOrphanLists shared_orphan_list_;
+
  public:
   GPUContext *context_alloc(void *ghost_window)
   {
-    return new GLContext(ghost_window);
+    return new GLContext(ghost_window, shared_orphan_list_);
   };
+
+  /* TODO remove */
+  void buf_free(GLuint buf_id);
+  void tex_free(GLuint tex_id);
+  void orphans_add(Vector<GLuint> &orphan_list, std::mutex &list_mutex, unsigned int id)
+  {
+    list_mutex.lock();
+    orphan_list.append(id);
+    list_mutex.unlock();
+  }
 };
+
+}  // namespace gpu
+}  // namespace blender