Introduce indirect file access (simple shim currently, .pak support etc soon)

component_animator.go

@@ -9,7 +9,6 @@ package GoRetro
 
 import (
 	"encoding/json"
-	"os"
 	"time"
 
 	"github.com/veandco/go-sdl2/sdl"
@@ -32,8 +31,6 @@ func NewAnimator(
 	renderer *sdl.Renderer) (*animator, error) {
 	var an animator
 
-	imagepath = Config.DataDir + imagepath
-
 	tex, err := loadTextureFromBMP(imagepath, renderer)
 	if err != nil {
 		return nil, err
@@ -122,17 +119,9 @@ func NewSequence(
 
 	var seq Sequence
 
-	indexpath = Config.DataDir + indexpath
+	jsonFile := GetFile(indexpath)
 
-	jsonFile, err := os.Open(indexpath)
-	if err != nil {
-		return nil, err
-	}
-	jsonParser := json.NewDecoder(jsonFile)
-	if err = jsonParser.Decode(&seq.frames); err != nil {
-		return nil, err
-	}
-	defer jsonFile.Close()
+	json.Unmarshal(jsonFile.Data, &seq.frames)
 
 	seq.frame = 0
 	seq.sampleRate = sampleRate

component_sprite_renderer.go

@@ -23,7 +23,6 @@ func NewSpriteRenderer(container *Element, renderer *sdl.Renderer, filename stri
 	sr := &spriteRenderer{}
 	var err error
 
-	filename = Config.DataDir + filename
 	sr.tex, err = loadTextureFromBMP(filename, renderer)
 	if err != nil {
 		panic(err)

component_spritesheet_renderer.go

@@ -21,7 +21,6 @@ func NewSpriteSheetRenderer(container *Element, renderer *sdl.Renderer, filename
 	sr := &spriteSheetRenderer{}
 	var err error
 
-	filename = Config.DataDir + filename
 	sr.tex, err = loadTextureFromBMP(filename, renderer)
 	if err != nil {
 		panic(err)

utils_file.go

@@ -0,0 +1,25 @@
+package GoRetro
+
+/*
+ * --------------------
+ * File Handler
+ * --------------------
+ * All IO should pass through this rather than direct file access to allow
+ * the use of archive files etc in future.
+ */
+
+import "os"
+
+type vFile struct {
+	Data []byte
+	Size int
+}
+
+func GetFile(filename string) *vFile {
+	Data, _ := os.ReadFile(Config.DataDir + filename)
+	vf := vFile{
+		Size: len(Data),
+		Data: Data,
+	}
+	return &vf
+}

utils_texture.go

@@ -47,7 +47,10 @@ func loadTextureFromBMP(filename string, renderer *sdl.Renderer) (*sdl.Texture,
 		return val, nil
 	}
 
-	img, err := sdl.LoadBMP(filename)
+	vFile := GetFile(filename)
+	file, _ := sdl.RWFromMem(vFile.Data)
+
+	img, err := sdl.LoadBMPRW(file, true)
 	if err != nil {
 		return nil, fmt.Errorf("loading %v: %v", filename, err)
 	}