android - java opengl: glDrawElements() with >32767 vertices -


this must simple, i'm missing it.

i have complex model has >32767 vertices. now, indices can passed opengl type gl_unsigned_byte or gl_unsigned_short. java has no concept of unsigned, unsigned short option maps (signed) short, 16 bits, or +32767. when specify vertices, need pass opengl short[], values in array point vertex in vertice array. however, if there >32767 vertices, value won't fit in short[].

is there way specify indices? code snippet below, thanks.

    short[] shorts = ... read indices ...;     ...     shortbuffer indicesbuffer = null;     bytebuffer ibb = bytebuffer.allocatedirect(indices.length * short.size / 8);     ibb.order(byteorder.nativeorder());     indicesbuffer = ibb.asshortbuffer();     indicesbuffer.put(indices);     indicesbuffer.position(0);     ...     gl.gldrawelements(gl10.gl_triangles, numofindices, gl10.gl_unsigned_short, indicesbuffer);     ...

i haven't used opengl java i'm speculating here, there's chance can use negative numbers binary reprentation same unsigned positive numbers want. you're giving gl byte pairs , telling interpret them unsigned, , long have right value when interpreted way, should work. doesn't matter if java thought meant different when stored bits in memory.

if you're iterating, ignore wraparound , keep on incrementing. when -1, you're done.

if you're calculating index numbers ints (which don't have range problem) , casting short, subtract 65536 number that's greater 32767.


Comments

Post a Comment

Popular posts from this blog

asp.net - repeatedly call AddImageUrl(url) to assemble pdf document -

i'm using abcpdf , i'm curious if can recursively call addimageurl() function assemble pdf document compile multiple urls? something like: int pagecount = 0; int theid = thedoc.addimageurl("http://stackoverflow.com/search?q=abcpdf+footer+page+x+out+of+", true, 0, true); //assemble document while (thedoc.chainable(theid)) { thedoc.page = thedoc.addpage(); theid = thedoc.addimagetochain(theid); } pagecount = thedoc.pagecount; console.writeline("1 document page count:" + pagecount); //flatten document (int = 1; <= pagecount; i++) { thedoc.pagenumber = i; thedoc.flatten(); } //now try again theid = thedoc.addimageurl("http://stackoverflow.com/questions/1980890/pdf-report-generation", true, 0, true); //assemble document while (thedoc.chainable(theid)) { thedoc.page = thedoc.addpage(); theid = thedoc.addimagetoc
Read more

java - Android recognize cell phone with keyboard or not? -

in android app, want detect user's device if device has keyboard(like motorola milestone) , show corresponding user interface. guys know how that? ! regards justicepenny http://developer.android.com/reference/android/content/res/configuration.html public int keyboard the kind of keyboard attached device. 1 of: keyboard_nokeys, keyboard_qwerty, keyboard_12key. that's it!
Read more

iphone - How would you achieve a LED Scrolling effect? -

how achieve led scrolling effect example below? led sign - led ticker emulator iphone , ipad http://img.skitch.com/20101201-rsfh4p1bajb1wp94k466pdpiuj.preview.jpg sometimes remunerates comment in other posts :) have put code you, should implement font '8pin matrix' realistic feeling. uilabel *label; - (void)viewdidload { [super viewdidload]; label = [[uilabel alloc]initwithframe:cgrectmake(10, 50, 300, 20)]; label.font = [uifont fontwithname:@"courier-bold" size:16.0]; label.backgroundcolor = [uicolor blackcolor]; label.textcolor = [uicolor greencolor]; label.linebreakmode = uilinebreakmodecharacterwrap; // otherwise "…" label.text = @"this led text scrolled "; // blanks space between [self.view addsubview:label]; [nstimer scheduledtimerwithtimeinterval:0.12f target:self selector:@selector(scrolllabel) use
Read more