PerspectiveCameraUpdateSystem Class Template

Updates camera transforms for active perspective cameras. More...

Declaration

template <typename TMemberHandle> class helios::engine::scene::systems::PerspectiveCameraUpdateSystem<TMemberHandle> { ... }

Public Member Typedefs Index

template <typename TMemberHandle>
using	EngineRoleTag = TypedSystemRole
	Role tag used for runtime registration as a system. More...

Public Member Functions Index

template <typename TMemberHandle>
void	update (UpdateContext &updateContext) noexcept
	Executes the camera update pass for all active camera entities. More...

Description

Updates camera transforms for active perspective cameras.

Recomputes LookAt and Perspective matrices only when the respective target components are marked as dirty.

Template Parameters

TMemberHandle

Camera entity handle type.

info

Although this system could be separated into to concurrently running systems, the regular use case for this system is that it only has to consider few camera entities per frames.

Definition at line 40 of file PerspectiveCameraUpdateSystem.ixx.

Public Member Typedefs

EngineRoleTag

template <typename TMemberHandle>

using helios::engine::scene::systems::PerspectiveCameraUpdateSystem< TMemberHandle >::EngineRoleTag = TypedSystemRole

Role tag used for runtime registration as a system.

Definition at line 47 of file PerspectiveCameraUpdateSystem.ixx.

47 using EngineRoleTag = TypedSystemRole;

Public Member Functions

update()

template <typename TMemberHandle>

void helios::engine::scene::systems::PerspectiveCameraUpdateSystem< TMemberHandle >::update (UpdateContext & updateContext)

inline noexcept

Executes the camera update pass for all active camera entities.

Parameters

updateContext

Frame-local update context with ECS access.

Definition at line 54 of file PerspectiveCameraUpdateSystem.ixx.

54 void update(UpdateContext& updateContext) noexcept {

55

56

57 for (auto [entity, tcw, vmc] : updateContext.view<

58 TMemberHandle,

59 TransformComponent<TMemberHandle, World>,

60 ViewMatrixComponent<TMemberHandle>

61 >().withActive()

62

63 .template whereAnyDirty<

64 TransformComponent<TMemberHandle, World>,

65 Active<TMemberHandle>

66 >()) {

67

68 const auto mat = tcw->value();

69

70 const auto eye = tcw->value().translation();

71 const auto center = eye + mat.column(2).toVec3().normalize();

72 const auto up = mat.column(1).toVec3().normalize();

73

74 entity.setTrackedValue(vmc, helios::math::lookAt(eye, center, up));

75 }

76

77 for (auto [entity, pcc, pmc] : updateContext.view<

78 TMemberHandle,

79 PerspectiveCameraComponent<TMemberHandle>,

80 ProjectionMatrixComponent<TMemberHandle>

81 >().withActive()

82 .template whereAnyDirty<

83 PerspectiveCameraComponent<TMemberHandle>,

84 Active<TMemberHandle>

85 >()) {

86

87 entity.setTrackedValue(pmc, helios::math::perspective(

88 pcc->fovY(),

89 pcc->aspectRatio(),

90 pcc->zNear(),

91 pcc->zFar()

92 ));

93 }

94

95

96 }

Reference helios::engine::scene::registerComponents.

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The documentation for this class was generated from the following file:

• PerspectiveCameraUpdateSystem.ixx

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