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Parallax System

Source: client/engine/systems/SystemsFunctions/ParallaxSystem.cpp

Purpose: Scroll parallax background layers.

Components used:

  • ParrallaxLayer (scroll_speed)
  • Transform
  • Drawable (for texture size)

Behavior​

  • Advance the layer X position by scroll_speed * dt.
  • Reset X position when it exceeds the negative texture width to create a loop.

Main signature​

void ParallaxSystem(Eng::registry &reg, const GameWorld &game_world,
    Eng::sparse_array<Com::Transform> &transforms,
    Eng::sparse_array<Com::ParrallaxLayer> const &parallax_layers,
    Eng::sparse_array<Com::Drawable> const &drawables);

Notes​

  • Relies on game_world.window_size_ and game_world.last_delta_.
  • Checks drawable.isLoaded before using texture size.