Drawable System

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

Purpose: Render entities with Drawable components: load textures, position sprites, and draw them.

Components used:

• Drawable
• Transform
• Shader (optional)

Behavior

• Initialize textures not yet loaded from drawable.spritePath (InitializeDrawable).
• Compute the sprite origin via GetOffsetFromTransform and apply it.
• Sort entities by z_index to honor draw order.
• For each entity, update position, scale, rotation, and opacity, then draw the sprite on game_world.window_.
• If a shader is attached and loaded, apply it and update the time uniform.

Main signature

void DrawableSystem(Eng::registry &reg, GameWorld &game_world,
	Eng::sparse_array<Com::Transform> const &transforms,
	Eng::sparse_array<Com::Drawable> &drawables,
	Eng::sparse_array<Com::Shader> &shaders);

Notes

• Texture load failures are logged to std::cerr.
• Depends on game_world for window_ and total_time_clock_.