Build Tags and Configuration

1. unsafe vs. Safe Mode#

The unsafe build tag has significant effects across the Bappa ecosystem:

In Warehouse:

• Directly affects how entities and components are accessed
• Uses direct memory access for component data retrieval via table.Accessor
• GetFromCursor operations become more efficient
• Critical for high-performance games with many entities

In Coldbrew Client Systems:

• Systems processing many entities (like physics or collision) gain significant performance
• Input systems and rendering pipelines can handle more entities per frame
• More suitable for games with large numbers of active entities

// Performance differences are most noticeable in tight loops:
cursor := scene.NewCursor(query)
for cursor.Next() {
    // Component access is faster in unsafe mode
    position := blueprintspatial.Components.Position.GetFromCursor(cursor)
    // ...
}

Mask Size and Component Limits#

The mask size build tags (m256, m512, m1024) determine the maximum number of unique component types you can use per storage:

Default (no tag): 64 component types
m256: 256 component types
m512: 512 component types
m1024: 1024 component types

Impact on Warehouse:

• Directly limits how many component types can exist in a single Storage
• Affects archetype creation and entity queries
• Larger games with many component types require larger masks

Practical Considerations:

• Most small to medium games work fine with 64 component types
• Complex simulations or RPGs might need 256+ component types
• Using larger masks than necessary adds a small performance overhead

Coldbrew Asset Loading Configuration#

Coldbrew has special configuration for asset loading that changes between development and production:

Development Mode#

• Assets are loaded directly from the filesystem at assets/
• Changes to assets can be seen immediately without recompilation
• Set by default when BAPPA_ENV environment variable is not “production”

Production Mode#

• Assets are loaded from embedded filesystem (using Go’s embed feature)
• More efficient and ensures assets are included in the binary
• Set when BAPPA_ENV="production"

// To enable production mode:
export BAPPA_ENV=production
go build

Cross-Package Configuration Considerations#

When setting up a Bappa-based game, there are important cross-package considerations:

1. Consistent Build Tags: Build tags should be consistent across all packages in the ecosystem

   go build -tags="unsafe m256"

2. Performance vs. Safety:

   • unsafe mode provides the best performance but with fewer safety checks
   • Safe mode is recommended during development for better error messages

3. Memory Footprint:

   • Larger mask sizes increase memory usage slightly
   • WASM targets may benefit from smaller mask sizes

4. Hot Reloading:

   • Development mode in Coldbrew enables asset hot reloading
   • Production mode embeds assets for distribution

WASM#

At its core, a Bappa game is a ebiten game. For WASM please see: https://ebitengine.org/en/documents/webassembly.html

Conclusion#

Understanding these configuration options allows you to optimize the Bappa ecosystem for your specific game requirements, whether you’re building a simple platformer or a complex simulation with thousands of entities.