aego/engine/config.go

package engine

import (
	"os"
	"path/filepath"

	"aego/core/clock"
	"aego/core/errs"
	"aego/core/log"
	"aego/platform"
)

const Version = "0.10.0"

type Config struct {
	Title             string
	Width             int
	Height            int
	Fullscreen        bool
	FixedSize         bool
	Hidden            bool
	VSync             platform.VSyncMode
	Headless          bool
	HeadlessFrameTime float64
	Debug             bool
	LogLevel          log.Level
	FixedHz           float64
	MaxFrameDelta     float64
	MaxFixedSteps     int
	Workers           int
	ResRoot           string
	UserRoot          string
	AppID             string
	Seed              uint64
	LoopScope         SystemScope
	Trace             bool
}

func (c Config) withDefaults() Config {
	if c.Title == "" {
		c.Title = "aego"
	}
	if c.Width <= 0 {
		c.Width = 1280
	}
	if c.Height <= 0 {
		c.Height = 720
	}
	if c.FixedHz <= 0 {
		c.FixedHz = 60
	}
	if c.MaxFrameDelta <= 0 {
		c.MaxFrameDelta = clock.DefaultMaxFrameDelta
	}
	if c.MaxFixedSteps <= 0 {
		c.MaxFixedSteps = clock.DefaultMaxSteps
	}
	if c.ResRoot == "" {
		c.ResRoot = "res"
	}
	if c.AppID == "" {
		c.AppID = "aego"
	}
	if c.LogLevel == 0 && !c.Debug {
		c.LogLevel = log.Info
	} else if c.Debug && c.LogLevel == 0 {
		c.LogLevel = log.Debug
	}
	if c.LoopScope == 0 {
		c.LoopScope = ScopePlay
	}
	return c
}

func (c Config) validate() error {
	if c.FixedHz <= 0 || c.FixedHz > 1000 {
		return errs.New(errs.EngineConfig, "FixedHz out of range", log.F("value", c.FixedHz))
	}
	if c.Width <= 0 || c.Height <= 0 {
		return errs.New(errs.EngineConfig, "window size must be positive")
	}
	return nil
}

func (c Config) userRoot() string {
	if c.UserRoot != "" {
		return c.UserRoot
	}
	base, err := os.UserConfigDir()
	if err != nil {
		base = os.TempDir()
	}
	return filepath.Join(base, "aego", c.AppID)
}