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+/*************************************************************************/
+/* openxr_opengl_extension.h */
+/*************************************************************************/
+/* This file is part of: */
+/* GODOT ENGINE */
+/* https://godotengine.org */
+/*************************************************************************/
+/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
+/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
+/* */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the */
+/* "Software"), to deal in the Software without restriction, including */
+/* without limitation the rights to use, copy, modify, merge, publish, */
+/* distribute, sublicense, and/or sell copies of the Software, and to */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions: */
+/* */
+/* The above copyright notice and this permission notice shall be */
+/* included in all copies or substantial portions of the Software. */
+/* */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+/*************************************************************************/
+
+#ifndef OPENXR_OPENGL_EXTENSION_H
+#define OPENXR_OPENGL_EXTENSION_H
+
+#ifdef GLES3_ENABLED
+
+#include "core/templates/vector.h"
+#include "openxr_extension_wrapper.h"
+
+#include "../openxr_api.h"
+#include "../util.h"
+
+#ifdef ANDROID_ENABLED
+#define XR_USE_GRAPHICS_API_OPENGL_ES
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES3/gl3.h>
+#include <GLES3/gl3ext.h>
+#else
+#define XR_USE_GRAPHICS_API_OPENGL
+#endif
+
+#ifdef WINDOWS_ENABLED
+// Including windows.h here is absolutely evil, we shouldn't be doing this outside of platform
+// however due to the way the openxr headers are put together, we have no choice.
+#include <windows.h>
+#endif
+
+#ifdef X11_ENABLED
+#include OPENGL_INCLUDE_H
+#define GL_GLEXT_PROTOTYPES 1
+#define GL3_PROTOTYPES 1
+#include "thirdparty/glad/glad/gl.h"
+#include "thirdparty/glad/glad/glx.h"
+#include <X11/Xlib.h>
+#endif
+
+#ifdef ANDROID_ENABLED
+// The jobject type from jni.h is used by openxr_platform.h on Android.
+#include <jni.h>
+#endif
+
+// include platform dependent structs
+#include <openxr/openxr_platform.h>
+
+class OpenXROpenGLExtension : public OpenXRGraphicsExtensionWrapper {
+public:
+ OpenXROpenGLExtension(OpenXRAPI *p_openxr_api);
+ virtual ~OpenXROpenGLExtension() override;
+
+ virtual void on_instance_created(const XrInstance p_instance) override;
+ virtual void *set_session_create_and_get_next_pointer(void *p_next_pointer) override;
+
+ virtual void get_usable_swapchain_formats(Vector<int64_t> &p_usable_swap_chains) override;
+ virtual void get_usable_depth_formats(Vector<int64_t> &p_usable_swap_chains) override;
+ virtual String get_swapchain_format_name(int64_t p_swapchain_format) const override;
+ virtual bool get_swapchain_image_data(XrSwapchain p_swapchain, int64_t p_swapchain_format, uint32_t p_width, uint32_t p_height, uint32_t p_sample_count, uint32_t p_array_size, void **r_swapchain_graphics_data) override;
+ virtual void cleanup_swapchain_graphics_data(void **p_swapchain_graphics_data) override;
+ virtual bool create_projection_fov(const XrFovf p_fov, double p_z_near, double p_z_far, Projection &r_camera_matrix) override;
+ virtual RID get_texture(void *p_swapchain_graphics_data, int p_image_index) override;
+
+private:
+ static OpenXROpenGLExtension *singleton;
+
+#ifdef WIN32
+ static XrGraphicsBindingOpenGLWin32KHR graphics_binding_gl;
+#elif ANDROID_ENABLED
+ static XrGraphicsBindingOpenGLESAndroidKHR graphics_binding_gl;
+#else
+ static XrGraphicsBindingOpenGLXlibKHR graphics_binding_gl;
+#endif
+
+ struct SwapchainGraphicsData {
+ bool is_multiview;
+ Vector<RID> texture_rids;
+ };
+
+ bool check_graphics_api_support(XrVersion p_desired_version);
+
+#ifdef ANDROID_ENABLED
+ EXT_PROTO_XRRESULT_FUNC3(xrGetOpenGLESGraphicsRequirementsKHR, (XrInstance), p_instance, (XrSystemId), p_system_id, (XrGraphicsRequirementsOpenGLESKHR *), p_graphics_requirements)
+#else
+ EXT_PROTO_XRRESULT_FUNC3(xrGetOpenGLGraphicsRequirementsKHR, (XrInstance), p_instance, (XrSystemId), p_system_id, (XrGraphicsRequirementsOpenGLKHR *), p_graphics_requirements)
+#endif
+ EXT_PROTO_XRRESULT_FUNC4(xrEnumerateSwapchainImages, (XrSwapchain), p_swapchain, (uint32_t), p_image_capacity_input, (uint32_t *), p_image_count_output, (XrSwapchainImageBaseHeader *), p_images)
+};
+
+#endif // GLES3_ENABLED
+
+#endif // OPENXR_OPENGL_EXTENSION_H