Revert "BGL: Workaround broken bgl usage caused by GPU refactor"

This reverts commit f12b0373f3.

source/blender/gpu/intern/gpu_state.cc

@@ -317,39 +317,10 @@ void GPU_apply_state(void)
   Context::get()->state_manager->apply_state();
 }
 
-/** \} */
-
-/* -------------------------------------------------------------------- */
-/** \name BGL workaround
- *
- * bgl makes direct GL calls that makes our state tracking out of date.
- * This flag make it so that the pyGPU calls will not override the state set by
- * bgl functions.
- * \{ */
-
-void GPU_bgl_start(void)
+/* Will set all the states regardless of the current ones. */
+void GPU_force_state(void)
 {
-  StateManager &state_manager = *(Context::get()->state_manager);
-  if (state_manager.use_bgl == false) {
-    /* Expected by many addons (see T80169, T81289).
-     * This will reset the blend function. */
-    GPU_blend(GPU_BLEND_NONE);
-    state_manager.apply_state();
-    state_manager.use_bgl = true;
-  }
-}
-
-void GPU_bgl_end(void)
-{
-  StateManager &state_manager = *(Context::get()->state_manager);
-  state_manager.use_bgl = false;
-  /* Resync state tracking. */
-  state_manager.force_state();
-}
-
-bool GPU_bgl_get(void)
-{
-  return Context::get()->state_manager->use_bgl;
+  Context::get()->state_manager->force_state();
 }
 
 /** \} */

source/blender/gpu/intern/gpu_state_private.hh

@@ -153,7 +153,6 @@ class StateManager {
  public:
   GPUState state;
   GPUStateMutable mutable_state;
-  bool use_bgl = false;
 
  public:
   StateManager();