opengl - is switching glPixelStorei a slow operation? -

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i have lots of different formats rbg, rbga , alpha , loading textures requires changing gl_unpack_alignment between 1 , 4. worth caching? having variable "alignment" , calling glpixelstorei if state differs vs calling glpixelstorei time.

same idea texture switching.

well, let's consider this.

every time change gl_pack_alignment, call gltexsubimage. function will, at best, provoke dma operation client memory opengl's internal texture memory. if you're not using pbos, means function have copy client memory internal storage dma. , if using pbos, you're going have copy operation memory.

do think changing state of pack alignment mean anything performance-wise next operations you're doing right after? think computing bitmap of glyph or uploading bitmap data texture faster changing piece of state?

don't worry it.


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