main: backport gl02 goodies

internal/io/config.go

@@ -0,0 +1,20 @@
+package io
+
+import "edgaru089.ml/go/gl01/internal/util"
+
+var (
+	MainConfig struct {
+		WindowWidth, WindowHeight int
+		FramerateLimit            int // 0: vsync, -1: unlimited
+	}
+)
+
+func LoadConfig() (err error) {
+
+	err = util.LoadJSON("main.cfg.json", &MainConfig)
+	if err != nil {
+		return
+	}
+
+	return
+}