Merge pull request fyne-io#3305 from Jacalz/shadersource

internal/painter/gl/painter.go

@@ -10,11 +10,19 @@ import (
 	"fyne.io/fyne/v2/theme"
 )
 
-var shaderSources = map[string][2][]byte{
-	"line":      {shaderLineVert.StaticContent, shaderLineFrag.StaticContent},
-	"line_es":   {shaderLineesVert.StaticContent, shaderLineesFrag.StaticContent},
-	"simple":    {shaderSimpleVert.StaticContent, shaderSimpleFrag.StaticContent},
-	"simple_es": {shaderSimpleesVert.StaticContent, shaderSimpleesFrag.StaticContent},
+func shaderSourceNamed(name string) ([]byte, []byte) {
+	switch name {
+	case "line":
+		return shaderLineVert.StaticContent, shaderLineFrag.StaticContent
+	case "line_es":
+		return shaderLineesVert.StaticContent, shaderLineesFrag.StaticContent
+	case "simple":
+		return shaderSimpleVert.StaticContent, shaderSimpleFrag.StaticContent
+	case "simple_es":
+		return shaderSimpleesVert.StaticContent, shaderSimpleesFrag.StaticContent
+	}
+
+	return nil, nil
 }
 
 // Painter defines the functionality of our OpenGL based renderer
@@ -128,8 +136,7 @@ func (p *painter) createProgram(shaderFilename string) Program {
 	// Why a switch over a filename?
 	// Because this allows for a minimal change, once we reach Go 1.16 and use go:embed instead of
 	// fyne bundle.
-	sources := shaderSources[shaderFilename]
-	vertexSrc, fragmentSrc := sources[0], sources[1]
+	vertexSrc, fragmentSrc := shaderSourceNamed(shaderFilename)
 	if vertexSrc == nil {
 		panic("shader not found: " + shaderFilename)
 	}