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diff --git a/source/blender/windowmanager/xr/intern/wm_xr_intern.h b/source/blender/windowmanager/xr/intern/wm_xr_intern.h
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+++ b/source/blender/windowmanager/xr/intern/wm_xr_intern.h
@@ -0,0 +1,91 @@
+/*
+ * 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.
+ */
+
+/** \file
+ * \ingroup wm
+ */
+
+#ifndef __WM_XR_INTERN_H__
+#define __WM_XR_INTERN_H__
+
+#include "CLG_log.h"
+
+#include "wm_xr.h"
+
+typedef struct wmXrSessionState {
+  bool is_started;
+
+  /** Last known viewer pose (centroid of eyes, in world space) stored for queries. */
+  GHOST_XrPose viewer_pose;
+  /** The last known view matrix, calculated from above's viewer pose. */
+  float viewer_viewmat[4][4];
+  float focal_len;
+
+  /** Copy of XrSessionSettings.flag created on the last draw call, stored to detect changes. */
+  int prev_settings_flag;
+  /** Copy of wmXrDrawData.eye_position_ofs. */
+  float prev_eye_position_ofs[3];
+
+  bool is_view_data_set;
+} wmXrSessionState;
+
+typedef struct wmXrRuntimeData {
+  GHOST_XrContextHandle context;
+
+  /* Although this struct is internal, RNA gets a handle to this for state information queries. */
+  wmXrSessionState session_state;
+  wmXrSessionExitFn exit_fn;
+} wmXrRuntimeData;
+
+typedef struct {
+  struct GPUOffScreen *offscreen;
+  struct GPUViewport *viewport;
+} wmXrSurfaceData;
+
+typedef struct wmXrDrawData {
+  struct Scene *scene;
+  struct Depsgraph *depsgraph;
+
+  wmXrData *xr_data;
+  wmXrSurfaceData *surface_data;
+
+  /** The pose (location + rotation) to which eye deltas will be applied to when drawing (world
+   * space). With positional tracking enabled, it should be the same as the base pose, when
+   * disabled it also contains a location delta from the moment the option was toggled. */
+  GHOST_XrPose base_pose;
+  float eye_position_ofs[3]; /* Local/view space. */
+} wmXrDrawData;
+
+wmXrRuntimeData *wm_xr_runtime_data_create(void);
+void wm_xr_runtime_data_free(wmXrRuntimeData **runtime);
+
+void wm_xr_session_draw_data_update(const wmXrSessionState *state,
+                                    const XrSessionSettings *settings,
+                                    const GHOST_XrDrawViewInfo *draw_view,
+                                    wmXrDrawData *draw_data);
+void wm_xr_session_state_update(const XrSessionSettings *settings,
+                                const wmXrDrawData *draw_data,
+                                const GHOST_XrDrawViewInfo *draw_view,
+                                wmXrSessionState *state);
+bool wm_xr_session_surface_offscreen_ensure(wmXrSurfaceData *surface_data,
+                                            const GHOST_XrDrawViewInfo *draw_view);
+void *wm_xr_session_gpu_binding_context_create(void);
+void wm_xr_session_gpu_binding_context_destroy(GHOST_ContextHandle context);
+
+void wm_xr_pose_to_viewmat(const GHOST_XrPose *pose, float r_viewmat[4][4]);
+void wm_xr_draw_view(const GHOST_XrDrawViewInfo *draw_view, void *customdata);
+
+#endif