Chapter 3: Resource Manager, Layers and Sprites

Technical requirements

The resource manager and asset loading

What changed in ch03 (before we start)

ResourceManager structure

What embed.FS is, and why this project uses it

Constructor and UseEmbeddedFS

Wiring embedded sprites: //go:embed, path constants, and loadTextures

Loading and retrieving textures

The layer structure

What are layers?

Implementing layers: we need a stack first

The stack, LIFO and Go generics

The layers implementation, ensureLayer, AddDraw, DrawAll

The layers system: queue then draw

Layer roots in the World

Structural layers vs GetLayer() on sprites

The World, drawNodes and draw flow

Recursion and DrawAll: two phases

The Engine, World and ResourceManager

Settings and overall flow

Load textures and create sprites

Load textures

Create sprites from textures

Draw order, floor first, player centered

Floor sprite, full screen

Player node, centered

Result

Running the chapter

Summary