From 3b22b50a2b9312a27218f2096d6d0a2dae2c115d Mon Sep 17 00:00:00 2001
From: Jeff Carr <jcarr@wit.com>
Date: Thu, 5 Dec 2024 18:49:47 -0600
Subject: using resources so it might run as a plugin

---
 main.go | 42 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

(limited to 'main.go')

diff --git a/main.go b/main.go
index d92b0b4..27e62cd 100644
--- a/main.go
+++ b/main.go
@@ -9,6 +9,8 @@ package main
 
 import (
 	"embed"
+	"io/fs"
+	"os"
 
 	"go.wit.com/dev/alexflint/arg"
 	"go.wit.com/log"
@@ -22,10 +24,14 @@ import (
 var VERSION string
 var BUILDTIME string
 
-//go:embed *.glsl
-var glFile embed.FS
+//go:embed resources/*
+var resources embed.FS
+
 var pp *arg.Parser
 
+// the glsl file
+var glslFile string
+
 func init() {
 	pp = arg.MustParse(&argv)
 
@@ -50,6 +56,7 @@ func init() {
 
 	go simpleStdin()
 
+	glslFile = loadGLSL(argv.Filename)
 	// I think this doesn't work as a goroutine because
 	// opengl closes. This plugin probably has to wait
 	// until there is some sort of protobuf + socket interface
@@ -66,3 +73,34 @@ func main() {
 	// parseConfig()
 	pixelgl.Run(run)
 }
+
+// LoadFileToString loads the contents of a file into a string
+func loadGLSL(filename string) string {
+	var err error
+	var data []byte
+
+	//
+	data, err = os.ReadFile(filename)
+	if err == nil {
+		log.Println("found embedded file:", filename)
+		return string(data)
+	}
+	data, err = fs.ReadFile(resources, filename)
+	if len(data) == 0 {
+		log.Info("still could not find file", filename, err)
+	} else {
+		return string(data)
+	}
+
+	filename = "resources/seascape.glsl"
+	log.Println("did not find  embedded file:", filename, err)
+	data, err = fs.ReadFile(resources, filename)
+	if len(data) == 0 {
+		log.Info("still could not find file", filename)
+		os.Exit(-1)
+	}
+
+	// return a string of the data to feed into
+	// canvas.SetFragmentShader(file)
+	return string(data)
+}
-- 
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