Merge branch 'linuxvr'

Author: malytomas

sources/libengine/virtualReality/platforms.cpp

@@ -5,8 +5,23 @@
 	#include <Windows.h>
 	#pragma comment(lib, "opengl32") // wglGetCurrentDC
 	#define XR_USE_PLATFORM_WIN32
+	#define GLFW_EXPOSE_NATIVE_WIN32
 #endif // CAGE_SYSTEM_WINDOWS
 
+#ifdef CAGE_SYSTEM_LINUX
+	#if defined(_GLFW_X11)
+		#define XR_USE_PLATFORM_XLIB
+		#define GLFW_EXPOSE_NATIVE_X11
+	#endif
+	#if defined(_GLFW_WAYLAND)
+		#define XR_USE_PLATFORM_WAYLAND
+		#define GLFW_EXPOSE_NATIVE_WAYLAND
+	#endif
+#endif // CAGE_SYSTEM_LINUX
+
+#include <GLFW/glfw3.h>
+#include <GLFW/glfw3native.h>
+
 #define XR_USE_GRAPHICS_API_OPENGL
 #include <openxr/openxr_platform.h>
 
@@ -45,22 +60,38 @@ namespace cage
 
 #ifdef CAGE_SYSTEM_WINDOWS
 
+			CAGE_ASSERT(glfwGetPlatform() == GLFW_PLATFORM_WIN32);
 			XrGraphicsBindingOpenGLWin32KHR binding;
 			init(binding, XR_TYPE_GRAPHICS_BINDING_OPENGL_WIN32_KHR);
 			binding.hDC = wglGetCurrentDC();
 			binding.hGLRC = wglGetCurrentContext();
 
-#else
+#elif defined(XR_USE_PLATFORM_XLIB)
 
-			CAGE_THROW_CRITICAL(Exception, "cage openxr currently works on windows only");
+			if (glfwGetPlatform() != GLFW_PLATFORM_X11)
+				CAGE_THROW_ERROR(Exception, "cannot initialize OpenXR for x11, glfw platform differs");
+			XrGraphicsBindingOpenGLXlibKHR binding;
+			init(binding, XR_TYPE_GRAPHICS_BINDING_OPENGL_XLIB_KHR);
+			binding.xDisplay = glfwGetX11Display();
+			// binding.visualid
+			// binding.glxFBConfig
+			binding.glxDrawable = glXGetCurrentDrawable();
+			binding.glxContext = glXGetCurrentContext();
 
-			char binding[100] = {}; // dummy structure to allow compiling
-			//XrGraphicsBindingOpenGLXlibKHR binding;
-			//init(binding, XR_TYPE_GRAPHICS_BINDING_OPENGL_XLIB_KHR);
+#elif defined(XR_USE_PLATFORM_WAYLAND)
 
-			// todo some platform specific magic
+			if (glfwGetPlatform() != GLFW_PLATFORM_WAYLAND)
+				CAGE_THROW_ERROR(Exception, "cannot initialize OpenXR for wayland, glfw platform differs");
+			XrGraphicsBindingOpenGLWaylandKHR binding;
+			init(binding, XR_TYPE_GRAPHICS_BINDING_OPENGL_WAYLAND_KHR);
+			binding.Display = glfwGetWaylandDisplay();
 
-#endif // CAGE_SYSTEM_WINDOWS
+#else
+
+			CAGE_THROW_ERROR(Exception, "unsupported platform for OpenXR in cage");
+			char binding[100] = {}; // dummy structure to allow compiling
+
+#endif
 
 			XrSessionCreateInfo info;
 			init(info, XR_TYPE_SESSION_CREATE_INFO);