// Load a texture, display the texture, display its alpha channel and
// show a preview of the inverted texture

class EditorGUITextures extends EditorWindow {

var texture : Texture2D;
var invertedTexture : Texture2D;
var showInverted = false;

@MenuItem("Examples/Texture Previewer")
static function Init() {
var window = GetWindow(EditorGUITextures);
window.position = Rect(0,0,400, 200);
window.Show();
}

function OnGUI() {
texture = EditorGUI.ObjectField(Rect(3,3,200,20),
"Add a Texture:",
texture,
Texture);
if(GUI.Button(Rect(208,3, position.width - 210, 20),"Process Inverted")) {
if(invertedTexture)
DestroyImmediate(invertedTexture);
//Copy the new texture
invertedTexture = new Texture2D(texture.width,
texture.height,
texture.format,
(texture.mipmapCount != 0));
for (var m : int = 0; m < texture.mipmapCount; m++)
invertedTexture.SetPixels(texture.GetPixels(m), m);
InvertColors();
showInverted = true;
}
if(texture) {
EditorGUI.PrefixLabel(Rect(25,45,100,15),0,GUIContent("Preview:"));
EditorGUI.DrawPreviewTexture(Rect(25,60,100,100),texture);
EditorGUI.PrefixLabel(Rect(150,45,100,15),0,GUIContent("Alpha:"));
EditorGUI.DrawTextureAlpha(Rect(150,60,100,100),texture);
EditorGUI.PrefixLabel(Rect(275,45,100,15),0,GUIContent("Inverted:"));
if(showInverted)
EditorGUI.DrawPreviewTexture(Rect(275,60,100,100),invertedTexture);
if(GUI.Button(Rect(3,position.height - 25, position.width-6,20),"Clear texture")) {
texture = EditorGUIUtility.whiteTexture;
showInverted = false;
}
} else {
EditorGUI.PrefixLabel(
Rect(3,position.height - 25,position.width - 6, 20),
0,
GUIContent("No texture found"));
}
}

function InvertColors() {
for (var m : int = 0; m < invertedTexture.mipmapCount; m++) {
var c : Color[] = invertedTexture.GetPixels(m);
for (var i : int = 0 ;i < c.Length; i++) {
c[i].r = 1 - c[i].r;
c[i].g = 1 - c[i].g;
c[i].b = 1 - c[i].b;
}
invertedTexture.SetPixels(c, m);
}
invertedTexture.Apply();
}
function OnInspectorUpdate() {
Repaint();
}
}