2 textures in onGUI drops fps to 30

Questions & Answers
1

i have a standard 60fps on my iphone 4 when rendering a scene. i then draw 2 textures in onGUI like this:

void OnGUI() 
	{
	GUI.DrawTexture(new Rect(0,0,Screen.width,Screen.height),textureBack);
        GUI.DrawTexture(new Rect(0,0,Screen.width,Screen.height),textureFront);
        }

and the FPS drops to ~30fps. The front image needs to have alpha so i set it to be overriden to RGBA 2bits, this image apparently has now 3 mb, the back image is 1.5mb, both have a resolution of 1024x768.

Is there a way to better handle this problem? i want the images to take max 10fps because… 30fps is absurde!

3

You can’t cover the screen with transparent textures and expect to get any kind of decent framerate on an iPhone 4. The hardware simply is not fast enough.

2

Never use OnGUI to draw Texture !
Don’t use this if you want display textures in Unity :).

Use GUITexture ( http://docs.unity3d.com/Documentation/Components/class-GuiTexture.html ) instead of OnGUI with GUI.DrawTexture( … );

One tutorial here if this can help you : - YouTube

If you need more explanations, I can give you more later :wink: