iphone - iOS OpenGL ES 2.0 MultiTexturing Decal is Semi-Transparent -

i have function adds billboard quads map texture. texture moves around 3d globe rotated. drawinrect looks this:

- (void)glkview:(glkview *)view drawinrect:(cgrect)rect {      // clear buffer , prepare draw     glclearcolor(1.0f, 1.0f, 1.0f, 1.0f);     glclear(gl_color_buffer_bit | gl_depth_buffer_bit);      // enable earth texture     self.effect.texture2d0.name = _earthinfo.name;     self.effect.texture2d0.target = _earthinfo.target;      // bind earth vertex array     glbindvertexarrayoes(_earthvertexarray);      // render object glkit     [self.effect preparetodraw];      // draw elements index array , uv / vertex / normal info     gldrawelements(gl_triangles,earth_polygoncount*3,gl_unsigned_short,0);      // draw skybox -- draw skybox centered on eye position //    _skyboxeffect.center = _eyeposition; //    _skyboxeffect.transform.projectionmatrix = self.effect.transform.projectionmatrix; //    _skyboxeffect.transform.modelviewmatrix = self.effect.transform.modelviewmatrix; //    [_skyboxeffect preparetodraw]; //    [_skyboxeffect draw];      // turn on blending before displaying satellites     // satellite image ( has alpha )     // shows ok     glblendfunc(gl_one, gl_one_minus_src_alpha);     glenable(gl_blend);      // billboard     [self createbillboardatlat:35 andlon:-97];      // billboard     [self createbillboardatlat:0 andlon:0];      // billboard     [self createbillboardatlat:-65 andlon:-137];  } 

in createbillboardat function, draw so:

// create billboard faces camera - (void)createbillboardatlat:(float)lat andlon:(float)lon {      ... stuff ....      // assign new matrix draw - no translation     self.effect.transform.modelviewmatrix = notranslationinfo;      // render object glkit     [self.effect preparetodraw];      // draw elements index array , uv / vertex / normal info     gldrawelements(gl_triangles,billboard_polygoncount*3,gl_unsigned_short,0);      // restore original matrix     self.effect.transform.modelviewmatrix = originalmat;  } 

i turn on blending before adding billboards @ orientations, textures hte satellites blend fine globe not each other. please see screenshot... doing wrong?

i've tried of these options none work - 1 ( foremost ) satellite eclipses 1 of other satellites - not both. please help!

    // turn on blending before displaying satellites     // satellite image ( has alpha )     // shows ok     glblendfunc(gl_src_alpha, gl_one_minus_src_alpha);     glenable(gl_blend);     //glenable(gl_depth_test);     //gldepthfunc(gl_lequal);     //gldepthmask(true);