Native Development

[hungcotac]

Hi

I deploy my application on both simulator and Dev Alpha A but some large image cannot display on Dev Alpha but still work smoothly on simulator. 

Any one tell my why???? 

[peter9477]

Any idea what size is too large? Is it around 2048 pixels in either direction?

[hungcotac]

Yes. but why have different between simulator and dev alpha ??

[peter9477]

Probably because the simulator doesn't support hardware acceleration for OpenGL stuff (partly guessing here) whereas the hardware has to. There's a limit to bitmaps of 2048x2048 in some places, so if you're dealing with larger images you'll need to chop them up and tile them (if that's helpful) or scale them, as I understand it...

[hungcotac]

But it work on Simulator and doesn't work on real Device

[peter9477]

My point was that the hardware OpenGL has limitations (2048x2048) which the simulator may not be subject to. This is speculation on my part.

[dishooom · Accepted solution]

Seems true...

The max texture size for Dev Alpha simulator has been specified to be 8192 pixels by 8192 pixels.

See this http://developer.blackberry.com/native/documentation/bb10/understand_the_blackberry_dev_alpha_simula...

This may not be the case with actual hardware.

- Dishooom

[peter9477]

Last time I queried it, OpenGL ES 2.0 responded with this data for the Dev Alpha A:

0x0d33 GL_MAX_TEXTURE_SIZE: [2048]

[borceg]

As Peter said, it's hardware limitation imposed by the GPU chip. PowerVR SGX540 which is present in PlayBook and Dev Alpha A limits GL_MAX_TEXTURE_SIZE for both ES 1.1 and ES 2.0 to 2048 pixels by 2048 pixels. Dev Alpha B uses OMAP 4470 with SGX544 GPU, which should allow up to 4096x4096 pixels (at least that is written in cpu's whitepaper)