Set options from defaults on first start

Data/GenericData.dat specifies what the default values for some options
should be. Respect them on startup if the options in config are unset.

internal/assetstore/data.go

@@ -0,0 +1,62 @@
+package assetstore
+
+import (
+	"code.ur.gs/lupine/ordoor/internal/config"
+	"code.ur.gs/lupine/ordoor/internal/data"
+)
+
+// Generic returns a struct containing a grab-bag of otherwise-unrelated data
+// TODO: it would be nice if this could be cleaner
+func (a *AssetStore) Generic() (*data.Generic, error) {
+	if a.generic != nil {
+		return a.generic, nil
+	}
+
+	filename, err := a.lookup("GenericData", "dat", "Data")
+	if err != nil {
+		return nil, err
+	}
+
+	generic, err := data.LoadGeneric(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	a.generic = generic
+
+	return generic, nil
+}
+
+func (a *AssetStore) DefaultOptions() (*config.Options, error) {
+	cfg := &config.Options{}
+	g, err := a.Generic()
+	if err != nil {
+		return nil, err
+	}
+
+	cfg.PlayMovies = intToBool(g.Options[data.OptionMovies])
+	cfg.PlayMusic = intToBool(g.Options[data.OptionMusic])
+	cfg.CombatVoices = intToBool(g.Options[data.OptionCombatVoices])
+	cfg.ShowGrid = intToBool(g.Options[data.OptionGrid])
+	cfg.ShowPaths = intToBool(g.Options[data.OptionShowPaths])
+	cfg.PointSaving = intToBool(g.Options[data.OptionPointSave])
+	cfg.AutoCutLevel = intToBool(g.Options[data.OptionAutoCutLevel])
+	cfg.Animations = intToBool(g.Options[data.OptionShowUnitAnimations])
+
+	// These are overrides of data.OptionCombatResolution. *This* default from
+	// 1998 is no good at all!
+	cfg.XRes = 1280
+	cfg.YRes = 1024
+
+	cfg.MusicVolume = g.Options[data.OptionMusicVolume]
+	cfg.SFXVolume = g.Options[data.OptionSoundEffectsVolume]
+
+	cfg.UnitSpeed = g.Options[data.OptionUnitAnimationSpeed]
+	cfg.AnimSpeed = g.Options[data.OptionEffectAnimationSpeed]
+
+	return cfg, nil
+}
+
+func intToBool(i int) bool {
+	return i > 0
+}