Improving performance of opengl sphere generator -


i trying @ least 120fps application, sits around 30fps. if remove sphere creating method, fps goes 120.

my sphere method checks every sphere see if out of bounds. using struct did not improve performance.

 xc = x coord  yc = y coord  zc = y coord  xd = x direction  yd = y direction  zd = z direction

is there way drastically improve efficiency?

this code called each frame.

void createspheres() {      for(int = 0; < spheres.size(); i+=6)     {          xc = spheres[i];          yc = spheres[i+1];          zc = spheres[i+2];          xd = spheres[i+3];          yd = spheres[i+4];          zd = spheres[i+5];                    if((xc+xd)>= 45 || (xc+xd)<= -45)                  {                               xd = 0-xd;                  }                  if((yc+yd)>= 9.5 || (yc+yd)<= -9.5)                  {                               yd = 0-yd;                  }                  if((zc+zd)>= 45 || (zc+zd)<= -45)                  {                               zd = 0-zd;                  }                  glenable(gl_texture_2d);                  glbindtexture ( gl_texture_2d, texture_id[6] );                  glpushmatrix();                  gltranslatef( xc+(xd/10), yc+(yd/10), zc+(zd/10));                     glrotatef( -80,1,0,0);                   glscalef( 0.10f, 0.10f, 0.10f);                   gluquadrictexture(quadric,1);                  glusphere(quadric,10.0,72,72);                   glpopmatrix();                  gldisable(gl_texture_2d);                  spheres[i] = xc+(xd/10);                  spheres[i+1] = yc+(yd/10);                  spheres[i+2] = zc+(zd/10);                  spheres[i+3] = xd;                  spheres[i+4] = yd;                  spheres[i+5] = zd;        } }

don't use old fixed-function pipeline, create vaos , vbos(http://www.opengl.org/wiki/vertex_specification) vertex attributes of each sphere.

edit: (added more basics vbos , vaos) when rendering without vbos, geometry data send each time render frame. using vbos allows send model data graphics card , render without cpu-gpu bottleneck.

glgenbuffers(1, &vbohandle);            // create vbo glbindbuffer(target, vbohandle);        // bind vbo glbufferdata(target, size, data, usage); // send vertex data (position, normals, ..)

then have establish connection between vbo data , shader attributes

// location of in-attribute of shader program vertexlocation = glgetattriblocation(programhandle,"vertex"); // activate desired vbo glbindbuffer(gl_array_buffer, vbohandle); // set attribute-pointer glvertexattribpointer(vertexlocation, 4, gl_float, gl_false, 0, 0); // enable attribute-array glenablevertexattribarray(vertexlocation);

vaos used organize vbos - end following problem:

enable vertex attrib1 enable vertex attrib2 enable vertex attrib3  rendermodel  disable vertex attrib1 disable vertex attrib2 disable vertex attrib3

with vaos reduce code effort to

enable vao  rendermodel  disable vao

so combined code fragment may like:

// create , bind vao glgenvertexarrays(1, &vaoid);  glbindvertexarray(vaoid);  // create , bind vbo glgenbuffers(1, &vboid);  glbindbuffer(gl_array_buffer, vboid); glbufferdata(gl_array_buffer, size, data, gl_static_draw);  glint loc = glgetattriblocation(programhandle, "attrib1"); glenablevertexattribarray(loc); glvertexattribpointer(loc, 3, gl_float, gl_false, 0, 0); // other vbos, attrib pointers ... // unbindvao glbindvertexarray(0); glbindbuffer(gl_array_buffer, 0);

that's minimal amount of information you'll need, recommend read chapters 8 , 12 of opengl superbible 5th edition.


Comments

Post a Comment

Popular posts from this blog

php - Why I am getting the Error "Commands out of sync; you can't run this command now" -

the documentation of error mentioned in title says if commands out of sync; can't run command now in client code, calling client functions in wrong order. this can happen, example, if using mysql_use_result() , try execute new query before have called mysql_free_result(). can happen if try execute 2 queries return data without calling mysql_use_result() or mysql_store_result() in between. from here: http://dev.mysql.com/doc/refman/5.0/en/commands-out-of-sync.html but in first query not fetching data mysql database, inserting. , in second query getting data database. here code $connection = mysqli_connect("localhost","username","password","tbl_msgs"); if(mysqli_connect_errno($connection)) { die("failed connect mysql: " . mysqli_connect_error()); } $query = "insert users (total_comments, total_views) values ({$total_comments}, {$total_views});"; $query .= "insert msgs (no...
Read more

linux - Does gcc have any options to add version info in ELF binary file? -

i mean whether gcc can insert source code version infor elf binary section or similar. not want change source file, add info gcc option in makefile. you can emit version info text file, turn text file object file statically link executable. the first step simple have write code: script or write version info in format plain text file. write makefile rule produce version.o version.txt, using objcopy . you'll have object file 2 useful symbols defined in it: beginning , end of textual version info. add generated object executable, , you'll able access version 2 ways: running strings on binary, or writing code in application print version string (you'll need declare start , end symbols variables in header file).
Read more

java - Are there any classes that implement javax.persistence.Parameter<T>? -

i'm using named queries fetch entities database using jpa , hibernate , came across puzzling me: how come there no default implementations of javax.persistence.parameter interface? i rather impressed how @staticmetamodel used criteriabuilder in jpa2 meaning type safety , don't have mess around setting string names. wanted apply similar of jpa1 ejb's i'm working on: dealergroup_.class: public dealergroup_ { public parameter<integer> id = new parameterimpl<integer>("id"); /// etc... } dealergroupfacade.class: // ... public dealergroup fetch(integer id) { typedquery<dealergroup> query = em.createnamedquery("dealergroup.fetchbyid", dealergroup.class); query.setparameter(dealergroup_.id, query); return query.getsingleresult(); } // ... i surprised find there no implementations of parameter interface - of course, implement myself absence makes me suspicious may mistake using in way? should implementing parameter...
Read more