Sparrow Forum

1. 

   catshow
   Member

   I am using the simulator and it is showing 80% CPU usage, with just one image being displayed on the screen.

   Here is the code:

   SPRenderTexture *renderTexture = [[SPRenderTexture alloc] initWithWidth:width height:height];

   // load an arbitrary image
   SPImage *image = [SPImage imageWithContentsOfFile:@"ent-bg.jpg"];

   // row 1
   [renderTexture draw:image];

   image.x += image.width;
   [renderTexture draw:image];

   // row 2
   image.y = image.height;
   [renderTexture draw:image];

   image.x = 0;
   [renderTexture draw:image];

   // row 3
   image.y = 2 * image.height;
   [renderTexture draw:image];

   image.x += image.width;
   [renderTexture draw:image];

   // display the rendered texture in an image
   SPImage *renderImage = [SPImage imageWithTexture:renderTexture];
   [self addChild:renderImage];

   [renderTexture release];

   Posted 1 year ago #
2. 

   Daniel
   Primary Feather

   Are you creating a new rendertexture each frame, or are you just displaying it once it has been created?

   If you're creating it only once, then the performance / CPU usage should be just the same as when you load a texture from the disk and display it! Could you check this? Otherwise, I will have a look at it!

   If, however, you are creating this render texture once per frame, I recommend you create the texture once and then use the "clearWithColor" method to clear it. This will definitely be faster.

   Anyway, keep in mind that the CPU usage of the simulator does not have to correspond with the CPU usage on the actual device. One would think that the simulator is always faster (since it's running on a desktop CPU), but since some stuff has to be emulated, it can even be slower in some situations.

   Posted 1 year ago #
3. 

   catshow
   Member

   That code was in my - (id)initWithWidth:(float)width height:(float)height method of the Game class. I think that it does not just happen with your RenderTexture class. Even with the base template it was using about 40% cpu.

   Posted 1 year ago #

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