android - Can I increase performances using glscissor -

i'm working on 2d game android using opengl es 1.1 , know if idea good/bad/useless.

i have screen divided in 3 sections, used scissors avoid object overlapping 1 view other.

i understand low level implementation of scissor , since draws take big part of computation, i'm looking ideas speed up.

my current idea follows:

if put glscissor around each object before draw it, increase speed of application.

the idea if put glscissor, (center+/-sizetexture), opengl pipeline have less tests (since can discard 90~99% of surface glscissors.

so opengl experts, good, bad or have no impact ? , why?

it shouldn't have impact, imho. i'm not expert, thinking follows:

• scissor test saves on gpu's fill rate (the amount of fragments/pixels hardware can put in framebuffer per second),
• if put glscissor around each object, test won't cut off - same number of pixels rendered, no fill rate saved.

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if want have rendering optimized, place start make sure you're doing optimal batching , reduce number of draw calls or complex state switches (texture switches).

of course correct approach optimizations try diagnose why rendering slow, above guess may or may not in particular situation.