opengl - Black screen in LWJGL -


i'm porting game of code obfuscated due porting c java.

my problem users report black screen , no other problems (sound working fine e.g.), no errors showing problem. on pc runs fine, , makes hell of debugging.

i wondering if can post (list of) reason(s) might occurring. i've read somewhere 1 of issues using 32 bits java on 64 bits system.

my code below, opensourced at: https://code.google.com/p/jake2t/

    private void rendersidebyside() {         glbindtexture(gl_texture_2d, 0);         glbindframebufferext(gl_framebuffer_ext, sbsfboid);          // render side side         glpushattrib(gl_all_attrib_bits);         glpushmatrix();          glmatrixmode(gl_projection);         glloadidentity();         gluortho2d(0, width, 0, height);         glmatrixmode (gl_modelview);         glloadidentity ();          glviewport(0,0,width,height);           glclearcolor(0.0f, 0.0f, 1.0f, 0.0f);         glclear (gl_color_buffer_bit | gl_depth_buffer_bit);          gldisable(gl_depth_test);         gldisable(gl_lighting);         gldisable(gl_blend);         gldisable(gl_alpha_test);         gldisable(gl_cull_face);          int shaderid = sbsshader.getid();         gldisable(gl_texture_2d);          arbshaderobjects.gluseprogramobjectarb(shaderid);          if (postfbotexturelocation[0] < 0) {             postfbotexturelocation[0] = arbshaderobjects.glgetuniformlocationarb(shaderid, "lefttexture");         }         if (postfbotexturelocation[1] < 0) {             postfbotexturelocation[1] = arbshaderobjects.glgetuniformlocationarb(shaderid, "righttexture");         }         if (postfbodepthtexturelocation[0] < 0) {             postfbodepthtexturelocation[0] = arbshaderobjects.glgetuniformlocationarb(shaderid, "leftdepthtexture");         }         if (postfbodepthtexturelocation[1] < 0) {             postfbodepthtexturelocation[1] = arbshaderobjects.glgetuniformlocationarb(shaderid, "rightdepthtexture");         }          // load images colors , depth values         glactivetexture(gl_texture0);         glbindtexture(gl_texture_2d, postfbotextureid[0]);         arbshaderobjects.gluniform1iarb(postfbotexturelocation[0], 0);          glactivetexture(gl_texture1);         glbindtexture(gl_texture_2d, postfbotextureid[1]);         arbshaderobjects.gluniform1iarb(postfbotexturelocation[1], 1);          glactivetexture(gl_texture2);         glbindtexture(gl_texture_2d, postfbodepthtexture[0]);         arbshaderobjects.gluniform1iarb(postfbodepthtexturelocation[0], 2);          glactivetexture(gl_texture3);         glbindtexture(gl_texture_2d, postfbodepthtexture[1]);         arbshaderobjects.gluniform1iarb(postfbodepthtexturelocation[1], 3);           glbegin (gl_quads);         gltexcoord2f(0.0f, 0.0f);         glvertex2i (0, 0);         gltexcoord2f(1.0f, 0.0f);         glvertex2i (width, 0);         gltexcoord2f(1.0f, 1.0f);         glvertex2i (width, height);         gltexcoord2f(0.0f, 1.0f);         glvertex2i (0, height);          glend();                                                              arbshaderobjects.gluseprogramobjectarb(0);          // rendering warping         glpopmatrix();         glpopattrib();          unbindfbo();     }      public void drawpostfbos() {         rendersidebyside();          glpushattrib(gl_all_attrib_bits);         glpushmatrix();          glmatrixmode(gl_projection);         glloadidentity();         gluortho2d(0, width, 0, height);         glmatrixmode (gl_modelview);         glloadidentity ();          glviewport(0,0,width,height);           glclearcolor(0.0f, 0.0f, 1.0f, 0.0f);         glclear (gl_color_buffer_bit);          gldisable(gl_depth_test);         gldisable(gl_lighting);         gldisable(gl_blend);         gldisable(gl_alpha_test);         gldisable(gl_cull_face);         gldisable(gl_texture_2d);          int shaderid = riftshader.getid();          arbshaderobjects.gluseprogramobjectarb(shaderid);          if (sbsfbotexturelocation < 0) {             sbsfbotexturelocation = arbshaderobjects.glgetuniformlocationarb(shaderid, "tex");         }          glactivetexture(gl_texture0);         glbindtexture(gl_texture_2d, sbsfbotextureid);         arbshaderobjects.gluniform1iarb(sbsfbotexturelocation, 0);           glbegin (gl_quads);         gltexcoord2f(0.0f, 0.0f);         glvertex2i (0, 0);         gltexcoord2f(1.0f, 0.0f);         glvertex2i (width, 0);         gltexcoord2f(1.0f, 1.0f);         glvertex2i (width, height);         gltexcoord2f(0.0f, 1.0f);         glvertex2i (0, height);          glend();                                                              arbshaderobjects.gluseprogramobjectarb(0);           glpopmatrix();         glpopattrib();     }

the common problems opengl 3+ programmer doesn't consider when coding are:

opengl extensions

  • use of arb , ext extension.
  • use of correct ogl extension.

  • use multiple implementation of different ogl extensions. here example using c++:

    #ifndef _mesa_invert_     /*** ... codes here ... ***/  #else     /*** ... alt codes here ... ***/  #endif

check if video card support following extension using:

  • glxinfo - linux , macos x based system.
  • glview - windows based system.

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