/**************************************************************************/
/*  openxr_fb_update_swapchain_extension.cpp                              */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "openxr_fb_update_swapchain_extension.h"

// always include this as late as possible
#include "../openxr_platform_inc.h"

OpenXRFBUpdateSwapchainExtension *OpenXRFBUpdateSwapchainExtension::singleton = nullptr;

OpenXRFBUpdateSwapchainExtension *OpenXRFBUpdateSwapchainExtension::get_singleton() {
	return singleton;
}

OpenXRFBUpdateSwapchainExtension::OpenXRFBUpdateSwapchainExtension(const String &p_rendering_driver) {
	singleton = this;
	rendering_driver = p_rendering_driver;
}

OpenXRFBUpdateSwapchainExtension::~OpenXRFBUpdateSwapchainExtension() {
	singleton = nullptr;
}

HashMap<String, bool *> OpenXRFBUpdateSwapchainExtension::get_requested_extensions() {
	HashMap<String, bool *> request_extensions;

	request_extensions[XR_FB_SWAPCHAIN_UPDATE_STATE_EXTENSION_NAME] = &fb_swapchain_update_state_ext;

	if (rendering_driver == "vulkan") {
#ifdef XR_USE_GRAPHICS_API_VULKAN
		request_extensions[XR_FB_SWAPCHAIN_UPDATE_STATE_VULKAN_EXTENSION_NAME] = &fb_swapchain_update_state_vulkan_ext;
#endif
	} else if (rendering_driver == "opengl3") {
#ifdef XR_USE_GRAPHICS_API_OPENGL_ES
		request_extensions[XR_FB_SWAPCHAIN_UPDATE_STATE_OPENGL_ES_EXTENSION_NAME] = &fb_swapchain_update_state_opengles_ext;
#endif
	}

	return request_extensions;
}

void OpenXRFBUpdateSwapchainExtension::on_instance_created(const XrInstance p_instance) {
	if (fb_swapchain_update_state_ext) {
		EXT_INIT_XR_FUNC(xrUpdateSwapchainFB);
		EXT_INIT_XR_FUNC(xrGetSwapchainStateFB);
	}

	if (fb_swapchain_update_state_vulkan_ext) {
		// nothing to register here...
	}

	if (fb_swapchain_update_state_opengles_ext) {
		// nothing to register here...
	}
}

void OpenXRFBUpdateSwapchainExtension::on_instance_destroyed() {
	fb_swapchain_update_state_ext = false;
	fb_swapchain_update_state_vulkan_ext = false;
	fb_swapchain_update_state_opengles_ext = false;
}

bool OpenXRFBUpdateSwapchainExtension::is_enabled() const {
	if (rendering_driver == "vulkan") {
		return fb_swapchain_update_state_ext && fb_swapchain_update_state_vulkan_ext;
	} else if (rendering_driver == "opengl3") {
#ifdef XR_USE_GRAPHICS_API_OPENGL_ES
		return fb_swapchain_update_state_ext && fb_swapchain_update_state_opengles_ext;
#else
		return fb_swapchain_update_state_ext;
#endif
	}

	return false;
}