SceneRenderingSystem.ixx File

System for rendering scenes through their associated viewports. More...

Included Headers

#include <cassert> #include <vector> #include <helios.engine.modules.scene.components.SceneNodeComponent> #include <helios.engine.modules.scene.types.SceneToViewportMap> #include <helios.rendering.RenderPassFactory> #include <helios.engine.runtime.world.UpdateContext> #include <helios.engine.mechanics.lifecycle.components.Active> #include <helios.engine.ecs.System> #include <helios.engine.modules.spatial.transform.components.ComposeTransformComponent> #include <helios.engine.runtime.world.GameWorld> #include <helios.rendering.RenderingDevice> #include <helios.engine.runtime.world.Session> #include <helios.scene.Scene>

Namespaces Index

namespace	helios
namespace	engine
	Main engine module aggregating core infrastructure and game systems. More...
namespace	modules
	Domain-specific components and systems. More...
namespace	scene
	Scene graph integration for game entities. More...
namespace	systems
	Scene graph synchronization and rendering systems. More...

Classes Index

class	SceneRenderingSystem
	Renders scenes through their configured viewports. More...

Description

System for rendering scenes through their associated viewports.

File Listing

The file content with the documentation metadata removed is:

1/**

2 * @file SceneRenderingSystem.ixx

3 * @brief System for rendering scenes through their associated viewports.

4 */

5module;

6

7

8#include <cassert>

9#include <vector>

10

11export module helios.engine.modules.scene.systems.SceneRenderingSystem;

12

13import helios.scene.Scene;

14

15import helios.rendering.RenderingDevice;

16

17import helios.engine.runtime.world.Session;

18

19import helios.engine.runtime.world.GameWorld;

20import helios.engine.ecs.System;

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

22

23import helios.engine.mechanics.lifecycle.components.Active;

24

25import helios.rendering.RenderPassFactory;

26

27import helios.engine.modules.scene.types.SceneToViewportMap;

28

29import helios.engine.modules.scene.components.SceneNodeComponent;

30import helios.engine.modules.spatial.transform.components.ComposeTransformComponent;

31

32export namespace helios::engine::modules::scene::systems {

33

34 using namespace helios::engine::modules::scene::types;

35

36 /**

37 * @brief Renders scenes through their configured viewports.

38 *

39 * @details This system iterates over all active viewport IDs from the session,

40 * resolves the associated scene and viewport via SceneToViewportMap, creates

41 * a scene snapshot, and submits it to the rendering device.

42 *

43 * The system runs in the Post phase after all gameplay updates are complete,

44 * ensuring the scene graph reflects the final state for this frame.

45 *

46 * @see SceneToViewportMap

47 * @see RenderingDevice

48 * @see RenderPassFactory

49 */

50 class SceneRenderingSystem : public helios::engine::ecs::System {

51

52 /**

53 * @brief Reference to the rendering device for draw call submission.

54 */

55 helios::rendering::RenderingDevice& renderingDevice_;

56

57 /**

58 * @brief Reference to the scene-to-viewport mapping.

59 */

60 helios::engine::modules::scene::types::SceneToViewportMap& sceneToViewportMap_;

61

62 public:

63

64 /**

65 * @brief Constructs the system with required dependencies.

66 *

67 * @param renderingDevice The rendering device for submitting draw calls.

68 * @param sceneToViewportMap Mapping from scenes to their viewports.

69 */

70 explicit SceneRenderingSystem(

71 helios::rendering::RenderingDevice& renderingDevice,

72 helios::engine::modules::scene::types::SceneToViewportMap& sceneToViewportMap

73 )

74 : renderingDevice_(renderingDevice), sceneToViewportMap_(sceneToViewportMap) {}

75

76 /**

77 * @brief Renders all active viewports for this frame.

78 *

79 * @details Iterates over the session's active viewport IDs, resolves each

80 * to its scene and viewport, creates a snapshot, builds a RenderPass, and

81 * submits it to the rendering device.

82 *

83 * @param updateContext The current frame's update context.

84 */

85 void update(helios::engine::runtime::world::UpdateContext& updateContext) noexcept override {

86

87

88 auto& session = updateContext.session();

89

90 auto viewportIds = session.viewportIds();

91

92 for (auto viewportId : viewportIds) {

93

94 auto scene = sceneToViewportMap_.scene(viewportId);

95 if (!scene) {

96 continue;

97 }

98

99 auto viewport = sceneToViewportMap_.viewport(scene->sceneId(), viewportId);

100 if (!viewport) {

101 continue;

102 }

103

104 const auto& snapshot = scene->createSnapshot(*viewport);

105 if (snapshot.has_value()) {

106 auto renderPass = helios::rendering::RenderPassFactory::getInstance()

107 .buildRenderPass(*snapshot);

108 renderingDevice_.render(renderPass);

109 }

110

111 }

112

113 }

114

115 };

116

117}

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