android - How do I draw a wireframe mesh with hidden lines removed in OpenGL ES? -

the cube want draw:

the above cube pretty easy created in opengl function glpolygonmode(gl_front_and_back, gl_line), known opengl es not include function want use. in word, don't want draw cube this:

i thank people provide help.

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the edge little thinner front edge. there have solution solve problem?

current code:

    gles20.glenable(gles20.gl_depth_test);     gles20.gldisable(gles20.gl_polygon_offset_fill);     // draw edge     gles20.gldrawelements(gles20.gl_lines, lineindices.length,             gles20.gl_unsigned_short, lineindexbuffer);      gles20.glenable(gles20.gl_polygon_offset_fill);     gles20.glpolygonoffset(1.0f, 1.0f);     // apply background color , draw faces     gles20.gluniform4fv(mcolorhandle, 1, facecolor, 0);     gles20.gldrawelements(gles20.gl_triangles, triangleindices.length,             gles20.gl_unsigned_short, triangleindexbuffer); 

here standard trick (assumes depth buffer enabled):

1. draw mesh edges (lines)
2. fill mesh polygons background color (to cover hidden lines)

since mesh edges , mesh faces have same z-values meet need solve z-fighting problem. simplest way use polygon offset edges "hover" "above" polygon faces:

gl.disable(gl.polygon_offset_fill) /* draw polygon edges */ gl.enable(gl.polygon_offset_fill); gl.polygonoffset(1.0, 1.0); /* fill polygons in background color */ 

here wireframe wineglass illustrates z-fighting problem:

here solved z-fighting problem using polygon offset: