EngineFlowSystem.ixx File

System that drives the high-level game state flow. More...

Included Headers

#include <helios.engine.runtime.world.tags.SystemRole> #include <helios.engine.runtime.world.Session> #include <helios.ecs> #include <helios.engine.runtime.enginestate.types> #include <helios.engine.runtime.enginestate.EngineStateBindings> #include <helios.engine.state.types.StateTransitionId> #include <helios.engine.runtime.world.UpdateContext> #include <helios.engine.state.types.StateTransitionRequest> #include <helios.engine.state.commands> #include <helios.engine.runtime.messaging.command.concepts>

Namespaces Index

namespace	helios
namespace	engine
namespace	runtime
namespace	enginestate
namespace	systems

Classes Index

class	EngineFlowSystem<TCommandBuffer>
	System that drives automatic game state transitions. More...

Description

System that drives the high-level game state flow.

File Listing

The file content with the documentation metadata removed is:

1

5module;

6

7export module helios.engine.runtime.enginestate.systems.EngineFlowSystem;

8

9import helios.engine.runtime.enginestate.types;

10

11import helios.engine.runtime.messaging.command.concepts;

12

13import helios.engine.state.commands;

14import helios.engine.state.types.StateTransitionRequest;

15import helios.engine.state.types.StateTransitionId;

16import helios.engine.runtime.enginestate.EngineStateBindings;

17

18import helios.engine.runtime.enginestate.types;

19

20import helios.ecs;

21import helios.engine.runtime.world.UpdateContext;

22import helios.engine.runtime.world.Session;

23

24import helios.engine.runtime.world.tags.SystemRole;

25

26using namespace helios::engine::state::commands;

27using namespace helios::engine::runtime::messaging::command::concepts;

28using namespace helios::engine::state::types;

29using namespace helios::engine::runtime::enginestate;

30using namespace helios::engine::runtime::enginestate::types;

31export namespace helios::engine::runtime::enginestate::systems {

32

46 template<typename TCommandBuffer>

47 requires IsCommandBufferLike<TCommandBuffer>

48 class EngineFlowSystem {

49

53 EngineState prevMatchState_ = EngineState::Undefined;

54

58 StateTransitionIdType<EngineState> prevEngineStateTransitionId_ = StateTransitionIdType<EngineState>::Undefined;

59

60 public:

61

62 using EngineRoleTag = helios::engine::runtime::world::tags::SystemRole;

63

64 using CommandBuffer_type = TCommandBuffer;

65

75 void update(helios::engine::runtime::world::UpdateContext& updateContext, TCommandBuffer& buffer) noexcept {

76

77 auto& session = updateContext.session();

78

79 const auto engineState = session.state<EngineState>();

80 auto engineStateTransitionId = session.stateTransitionId<EngineState>();

81

82 // only return if the state is undefined.

83 // in any other case, we allow to drive the state forward, even if

84 // the previous state is the same as the current one, in case any guard

85 // did veto the next state

86 if (engineState == EngineState::Undefined) {// && prevMatchState_ == engineState && prevEngineStateTransitionId_ == engineStateTransitionId) {

87 return;

88 }

89

90 prevMatchState_= engineState;

91 prevEngineStateTransitionId_ = engineStateTransitionId;

92

93 switch (engineState) {

94 case EngineState::Booting: {

95 buffer.template add<StateCommand<EngineState>>(

96 StateTransitionRequest<EngineState>(engineState, EngineStateTransitionId::BootRequest)

97 );

98 break;

99 }

100

101 case EngineState::Booted: {

102 buffer.template add<StateCommand<EngineState>>(

103 StateTransitionRequest<EngineState>(engineState, EngineStateTransitionId::WarmupRequest)

104 );

105 break;

106 }

107

108

109 default:

110 break;

111 }

112 }

113 };

114}

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