opengl es - How to draw a texture using glDrawTexiOES? -


i try following code, without success :

i create texture :

glactivetexture(gl_texture0); glgentextures(1, @tex); glbindtexture(gl_texture_2d, tex); gltexparameteri(gl_texture_2d, gl_texture_wrap_s, gl_clamp_to_edge); gltexparameteri(gl_texture_2d, gl_texture_wrap_t, gl_clamp_to_edge); gltexparameteri(gl_texture_2d, gl_texture_mag_filter, gl_nearest); gltexparameteri(gl_texture_2d, gl_texture_min_filter, gl_nearest); tjglutils.javaclass.teximage2d(gl_texture_2d, // target: integer;                                      0, // level: integer;                                      abitmap, // bitmap: jbitmap;                                      0); // border: integer  =>  glteximage2d(gl_texture_2d, 0, gl_rgba, 100, 100, 0, gl_rgba, gl_unsigned_byte, nil); glbindtexture(gl_texture_2d, 0);

then later in main render loop try draw texture gldrawtexioes :

eglmakecurrent(eglgetcurrentdisplay, sharedsurface, sharedsurface,   sharedcontext);  glviewport(round(fcontentrect.left * fscale), round(fcontentrect.top * fscale), round(fcontentrect.width * fscale),  round(fcontentrect.height * fscale));  gldepthmask(1); glcleardepthf(1); glclearstencil(0); glclearcolor(0, 0, 0, 0); glclear(gl_depth_buffer_bit or gl_stencil_buffer_bit or gl_color_buffer_bit);  glbindtexture(gl_texture_2d, tex);  aparams[0] := 0; aparams[1] := 0; aparams[2] := 100; aparams[3] := 100; gltexparameteriv(gl_texture_2d, gl_texture_crop_rect_oes, @aparams[0]);  gldrawtexioes(0, 0, 0, 100, 100);  eglswapbuffers(shareddisplay, sharedsurface);

but it's not work :( did miss ?

note: function crash on line: gltexparameteriv(gl_texture_2d, gl_texture_crop_rect_oes, @aparams[0]); error 1280

have tried read specification , error code? it's pretty clear problem ...

that error code gl_invalid_enum, doesn't platform support extension needed gl_texture_crop_rect_oes trying use.


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