lib/openxr/session.rb in openxr-0.3.0 vs lib/openxr/session.rb in openxr-0.4.0

@@ -1,12 +1,60 @@
 # This is free and unencumbered software released into the public domain.
 
 require_relative 'api'
 require_relative 'handle'
+require_relative 'result'
 
 ##
 # An OpenXR session handle.
 #
 # @see https://www.khronos.org/registry/OpenXR/specs/1.0/html/xrspec.html#session
 class OpenXR::Session < OpenXR::Handle
-  # TODO
+  extend OpenXR::API
+  include OpenXR::API
+
+  # @return [Instance]
+  attr_reader :instance
+
+  # @return [System]
+  attr_reader :system
+
+  ##
+  # @param  [System]
+  # @param  [XrGraphicsBinding] graphics_binding
+  # @raise  [Result::Error] if `xrCreateSession` failed
+  def initialize(system, graphics_binding = nil)
+    @instance = system.instance
+    @system   = system
+    @struct   = XrSession.new
+
+    # https://www.khronos.org/registry/OpenXR/specs/1.0/man/html/openxr.html#_xrsessioncreateinfo3
+    request = XrSessionCreateInfo.new
+    request[:base][:next] = graphics_binding
+    request[:createFlags] = 0
+    request[:systemId] = system.id
+
+    # https://www.khronos.org/registry/OpenXR/specs/1.0/man/html/openxr.html#_xrcreatesession3
+    case result = xrCreateSession(instance.handle, request, @struct)
+      when XR_SUCCESS
+      else raise OpenXR::Result.for(result).new(:xrCreateSession)
+    end
+  end
+
+  #
+  # @return [FFI::Pointer]
+  def handle
+    @struct[:handle]
+  end
+
+  ##
+  # @return [void]
+  # @raise  [Result::Error] if `xrDestroySession` failed
+  def destroy!
+    return if @struct.nil?
+    # https://www.khronos.org/registry/OpenXR/specs/1.0/man/html/openxr.html#_xrdestroysession3
+    case result = xrDestroySession(@struct[:handle])
+      when XR_SUCCESS then @struct = nil
+      else raise OpenXR::Result.for(result).new(:xrDestroySession) # unreachable
+    end
+  end
 end # OpenXR::Session