I am running a native application on Android. In the app I am querying GL extensions to dynamically detect if an Android phone supports ATITC pre-compressed textures. I'm looking for the string 'GL_ATI_texture_compression_atitc' in the extensions string reported by the phone. I have two questions regarding this:
1. Is 'GL_ATI_texture_compression_atitc' the right extension to look for if I want to use pre-compressed textures (ATITC)? Or should I be looking for 'GL_ATI_compressed_texture_atitc' instead?
2. Does the HTC Hero support ATITC pre-compressed texures? Both the HTC G1 and HTC Hero report 'GL_ATI_texture_compression_atitc' in the GL extensions. However, only the G1 seems to be supporting ATITC pre-compressed textures. The same build (with pre-compressed ATITC textures) works on the G1 but not on the Hero (on the Hero I see rectangular blocks instead of the textures indicating that the handset did not understand the glType).
Hi Anagha,
I'm much more familiar with the OpenGL ES 1.1 and 2.0 drivers on the newer Adreno 200+ hardware, but I'll try and help out.
The HTC Hero hardware and driver should support ATITC textures. I looked at the glBenchmark results for this phone and the extension name there is GL_ATI_texture_compression_atitc. This extension should use the same token numbers as the AMD_compressed_ATC_texture extension. Meaning you want to use these tokens:
ATC_RGB_AMD 0x8C92
ATC_RGBA_EXPLICIT_ALPHA_AMD 0x8C93
ATC_RGBA_INTERPOLATED_ALPHA_AMD 0x87EE
If you have problems with black textures try using glGetError() to narrow down which API calls are failing.