Images and textures best practices

The required memory bandwidth that rendering of large textures and images use can slow down your application. Use these tips to improve the performance of your application by creating and using optimal images and textures:

• The easiest way to optimize the performance of your application is to reduce the amount of detail in your images by using smaller data sizes. See Adjusting the data size.
• Kanzi supports AMD Texture Compression (ATC), Ericsson Texture Compression (ETC), and PowerVR Texture Compression (PVRTC) for compressing images used in textures. See Compressing textures.
  
• When users run your Kanzi application in an environment with a multi-core processor, Kanzi automatically uses multiple CPU cores to load the GPU resources in the .kzb files to RAM. Kanzi enables you to configure how many cores you want your application to use. See Loading resources in parallel.
• Use mipmaps to create a set of downscaled sublevels from a large texture. Mipmaps increase the GPU memory use by one third, but improve the performance when the full texture does not have to be sampled. Use mimaps to improve the performance whenever you scale a textured node. See Using mipmaps.
• Apply texture filtering to increase either quality or performance. This method can be very effective if you are familiar with the application behavior in advance. See Filtering textures.
• OpenGL ES 2 specification does not require filtering or mipmaps for textures whose size is not power-of-two. For Kanzi to correctly render your textures, make sure that:
  • Your target device supports GL_OES_texture_npot extension.
  or
  • Size of the textures is power-of-two.
  or
  • Textures have Mipmap Mode property set to Base and Wrap Mode property set to Clamp.
  or
  • In Project > Properties enable the Round Images to Nearest Power of 2 property.
• For all textures set the Format property to RGBA (8-bit), because GLES is not required to render three-channel texture formats.
  
• Make sure that all textures have the Mipmap Mode property set to at least Nearest. Use the Mipmap Mode value Base only very small textures (for example, 4 by 4 pixels and smaller).
• Make the textures which contain only flat color no larger than 4 by 4 pixels and set the Texture Settings properties:
  • Minification Filter to Nearest
  • Magnification Filter to Nearest
  • Mipmap Mode to Base
  
• When you use a Text BlockKanzi creates a glyph cache texture for every font and font size combination. You can set the height and width of glyph cache textures to adjust the size of the glyph cache texture either when it gets full, or to optimize the performance of your Kanzi application. See Size of the glyph cache texture.

See also

Adjusting the data size

Loading resources in parallel

Using mipmaps

Compressing textures

Filtering textures

Measuring the performance of your application

Best practices

Textures

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