st/oxr: Add dpad state and functions

src/xrt/state_trackers/oxr/CMakeLists.txt

@@ -18,6 +18,7 @@ add_library(
 	oxr_api_verify.h
 	oxr_binding.c
 	oxr_chain.h
+	oxr_dpad.c
 	oxr_event.c
 	oxr_extension_support.h
 	oxr_handle_base.c

src/xrt/state_trackers/oxr/oxr_dpad.c

@@ -0,0 +1,70 @@
+// Copyright 2022, Collabora, Ltd.
+// SPDX-License-Identifier: BSL-1.0
+/*!
+ * @file
+ * @brief  Holds binding related functions.
+ * @author Jakob Bornecrantz <jakob@collabora.com>
+ * @ingroup oxr_main
+ */
+
+#include "oxr_objects.h"
+
+
+/*
+ *
+ * Helper functions.
+ *
+ */
+
+static void
+destroy_callback(void *item, void *priv)
+{
+	free(item);
+}
+
+
+/*
+ *
+ * 'Exported' functions.
+ *
+ */
+
+bool
+oxr_dpad_state_init(struct oxr_dpad_state *state)
+{
+	if (u_hashmap_int_create(&state->uhi) < 0) {
+		return false;
+	}
+
+	return true;
+}
+
+struct oxr_dpad_entry *
+oxr_dpad_state_get(struct oxr_dpad_state *state, uint64_t key)
+{
+	void *ptr = NULL;
+	u_hashmap_int_find(state->uhi, key, &ptr);
+	return (struct oxr_dpad_entry *)ptr;
+}
+
+struct oxr_dpad_entry *
+oxr_dpad_state_get_or_add(struct oxr_dpad_state *state, uint64_t key)
+{
+	struct oxr_dpad_entry *e = oxr_dpad_state_get(state, key);
+	if (e == NULL) {
+		e = U_TYPED_CALLOC(struct oxr_dpad_entry);
+		int ret = u_hashmap_int_insert(state->uhi, key, (void *)e);
+		assert(ret >= 0);
+	}
+
+	return e;
+}
+
+void
+oxr_dpad_state_deinit(struct oxr_dpad_state *state)
+{
+	if (state->uhi != NULL) {
+		u_hashmap_int_clear_and_call_for_each(state->uhi, destroy_callback, NULL);
+		u_hashmap_int_destroy(&state->uhi);
+	}
+}

src/xrt/state_trackers/oxr/oxr_objects.h

@@ -125,6 +125,7 @@ struct oxr_action_attachment;
 struct oxr_action_set_attachment;
 struct oxr_action_input;
 struct oxr_action_output;
+struct oxr_dpad_state;
 struct oxr_binding;
 struct oxr_interaction_profile;
 struct oxr_action_set_ref;
@@ -636,6 +637,54 @@ oxr_action_get_input_source_localized_name(struct oxr_logger *log,
  * @}
  */
 
+
+/*!
+ *
+ * @name oxr_dpad.c
+ * @{
+ *
+ */
+
+/*!
+ * Initialises a dpad state, has to be zero init before a call to this function.
+ *
+ * @public @memberof oxr_dpad_state_get
+ */
+bool
+oxr_dpad_state_init(struct oxr_dpad_state *state);
+
+/*!
+ * Look for a entry in the state for the given action set key,
+ * returns NULL if no entry has been made for that action set.
+ *
+ * @public @memberof oxr_dpad_state_get
+ */
+struct oxr_dpad_entry *
+oxr_dpad_state_get(struct oxr_dpad_state *state, uint64_t key);
+
+/*!
+ * Look for a entry in the state for the given action set key,
+ * allocates a new entry if none was found.
+ *
+ * @public @memberof oxr_dpad_state_get
+ */
+struct oxr_dpad_entry *
+oxr_dpad_state_get_or_add(struct oxr_dpad_state *state, uint64_t key);
+
+/*!
+ * Frees all state and entries attached to this dpad state.
+ *
+ * @public @memberof oxr_dpad_state_get
+ */
+void
+oxr_dpad_state_deinit(struct oxr_dpad_state *state);
+
+
+/*!
+ * @}
+ */
+
+
 /*!
  *
  * @name oxr_session.c
@@ -1802,6 +1851,31 @@ struct oxr_action_attachment
 #undef OXR_CACHE_MEMBER
 };
 
+/*!
+ * A entry in the dpad state for one action set.
+ *
+ * @ingroup oxr_input
+ */
+struct oxr_dpad_entry
+{
+#ifdef XR_EXT_dpad_binding
+	XrInteractionProfileDpadBindingEXT dpads[4];
+	uint32_t dpad_count;
+#endif
+
+	uint64_t key;
+};
+
+/*!
+ * Holds dpad binding state for a single interaction profile.
+ *
+ * @ingroup oxr_input
+ */
+struct oxr_dpad_state
+{
+	struct u_hashmap_int *uhi;
+};
+
 /*!
  * @}
  */