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Thread: Material (specular and shininess) not working with GL_FRONT_AND_BACK (under Linux)

  1. #1
    Junior Member Newbie
    Join Date
    Mar 2017
    Posts
    5

    Material (specular and shininess) not working with GL_FRONT_AND_BACK (under Linux)

    Hi,

    i try to draw a polygon mesh that has to be visible from both sides. Therefore i have set
    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mat_specular);
    glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mat_shininess);

    With GL_FRONT or GL_BACK it works fine for one side, however with both it doesn't at all (everything looks white without shading or color. When i compile the same code under Windows it looks as it should. Any ideas?

    Here is the complete init function:

    Code cpp:
    void initializeGL()
    {
        //qglClearColor(Qt::black);
        glEnable(GL_DEPTH_TEST);
        glShadeModel(GL_SMOOTH);
        glEnable(GL_POLYGON_SMOOTH);
        glEnable(GL_LINE_SMOOTH);
     
    #ifdef TRANSPARENCY
        glEnable(GL_BLEND); // Transparency
        glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    #endif
     
    #ifdef LIGHTING
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glEnable(GL_RESCALE_NORMAL);
        glEnable(GL_COLOR_MATERIAL);
     
        GLfloat mat_specular[] = {1.0, 1.0, 1.0, 1.0};
        GLfloat mat_shininess[] = {1000.0};
        GLfloat light_position[] = {0, 0.5, 1.0, 0.0};
        //glClearColor (0.0, 0.0, 0.0, 0.0);
     
        glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mat_specular);
        glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mat_shininess);
        glLightfv(GL_LIGHT0, GL_POSITION, light_position);
        GLfloat lmodel_ambient[]={0.2, 0.2, 0.2, 1.0};
        glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
        glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_ambient);
    #endif
     
        glDisable(GL_CULL_FACE);
        //glCullFace(GL_NONE);
    }
    Last edited by Dark Photon; 12-18-2017 at 05:33 PM.

  2. #2
    Senior Member OpenGL Pro
    Join Date
    Jan 2007
    Posts
    1,748
    Quote Originally Posted by gde230 View Post
    With GL_FRONT or GL_BACK it works fine for one side, however with both it doesn't at all (everything looks white without shading or color. When i compile the same code under Windows it looks as it should. Any ideas?
    OS is not relevant. What's your graphics hardware?

  3. #3
    Junior Member Newbie
    Join Date
    Mar 2017
    Posts
    5
    Hardware is a thinkpad T430

    sudo lshw -C display
    *-display
    description: VGA compatible controller
    product: 3rd Gen Core processor Graphics Controller
    vendor: Intel Corporation
    physical id: 2
    bus info: pci@0000:00:02.0
    version: 09
    width: 64 bits
    clock: 33MHz
    capabilities: msi pm vga_controller bus_master cap_list rom
    configuration: driver=i915 latency=0
    resources: irq:27 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:6000(size=64)

  4. #4
    Member Regular Contributor
    Join Date
    Jul 2012
    Posts
    457
    Also give the (relevant part of) output of glxinfo.

  5. #5
    Junior Member Newbie
    Join Date
    Mar 2017
    Posts
    5
    here you go
    Code :
    name of display: :0
    display: :0  screen: 0
    direct rendering: Yes
    server glx vendor string: SGI
    server glx version string: 1.4
    server glx extensions:
        GLX_ARB_create_context, GLX_ARB_create_context_profile, 
        GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float, 
        GLX_ARB_framebuffer_sRGB, GLX_ARB_multisample, 
        GLX_EXT_create_context_es2_profile, GLX_EXT_create_context_es_profile, 
        GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB, 
        GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, 
        GLX_EXT_visual_rating, GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer, 
        GLX_OML_swap_method, GLX_SGIS_multisample, GLX_SGIX_fbconfig, 
        GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, GLX_SGI_swap_control
    client glx vendor string: Mesa Project and SGI
    client glx version string: 1.4
    client glx extensions:
        GLX_ARB_create_context, GLX_ARB_create_context_profile, 
        GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float, 
        GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample, 
        GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile, 
        GLX_EXT_create_context_es_profile, GLX_EXT_fbconfig_packed_float, 
        GLX_EXT_framebuffer_sRGB, GLX_EXT_import_context, 
        GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating, 
        GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer, 
        GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer, 
        GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control, 
        GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, 
        GLX_SGIX_visual_select_group, GLX_SGI_make_current_read, 
        GLX_SGI_swap_control, GLX_SGI_video_sync
    GLX version: 1.4
    GLX extensions:
        GLX_ARB_create_context, GLX_ARB_create_context_profile, 
        GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float, 
        GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample, 
        GLX_EXT_create_context_es2_profile, GLX_EXT_create_context_es_profile,                                                                                                                 
        GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB,                                                                                                                               
        GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info,                                                                                                              
        GLX_EXT_visual_rating, GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer,                                                                                                                 
        GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,                                                                                                                             
        GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control,                                                                                                                      
        GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,                                                                                                                             
        GLX_SGIX_visual_select_group, GLX_SGI_make_current_read,                                                                                                                               
        GLX_SGI_swap_control, GLX_SGI_video_sync                                                                                                                                               
    Extended renderer info (GLX_MESA_query_renderer):                                                                                                                                          
        Vendor: Intel Open Source Technology Center (0x8086)                                                                                                                                   
        Device: Mesa DRI Intel(R) Ivybridge Mobile  (0x166)                                                                                                                                    
        Version: 17.0.7                                                                                                                                                                        
        Accelerated: yes                                                                                                                                                                       
        Video memory: 1536MB                                                                                                                                                                   
        Unified memory: yes
        Preferred profile: core (0x1)
        Max core profile version: 3.3
        Max compat profile version: 3.0
        Max GLES1 profile version: 1.1
        Max GLES[23] profile version: 3.0
    OpenGL vendor string: Intel Open Source Technology Center
    OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Mobile 
    OpenGL core profile version string: 3.3 (Core Profile) Mesa 17.0.7
    OpenGL core profile shading language version string: 3.30
    OpenGL core profile context flags: (none)
    OpenGL core profile profile mask: core profile
    OpenGL core profile extensions:
        GL_3DFX_texture_compression_FXT1, GL_AMD_conservative_depth, 
        GL_AMD_draw_buffers_blend, GL_AMD_seamless_cubemap_per_texture, 
        GL_AMD_shader_trinary_minmax, GL_AMD_vertex_shader_layer, 
        GL_AMD_vertex_shader_viewport_index, GL_ANGLE_texture_compression_dxt3, 
        GL_ANGLE_texture_compression_dxt5, GL_APPLE_object_purgeable, 
        GL_ARB_ES2_compatibility, GL_ARB_ES3_compatibility, 
        GL_ARB_arrays_of_arrays, GL_ARB_base_instance, GL_ARB_blend_func_extended, 
        GL_ARB_buffer_storage, GL_ARB_clear_buffer_object, GL_ARB_clear_texture, 
        GL_ARB_clip_control, GL_ARB_compressed_texture_pixel_storage, 
        GL_ARB_compute_shader, GL_ARB_conditional_render_inverted, 
        GL_ARB_conservative_depth, GL_ARB_copy_buffer, GL_ARB_copy_image, 
        GL_ARB_cull_distance, GL_ARB_debug_output, GL_ARB_depth_buffer_float, 
        GL_ARB_depth_clamp, GL_ARB_derivative_control, GL_ARB_direct_state_access, 
        GL_ARB_draw_buffers, GL_ARB_draw_buffers_blend, 
        GL_ARB_draw_elements_base_vertex, GL_ARB_draw_indirect, 
        GL_ARB_draw_instanced, GL_ARB_enhanced_layouts, 
        GL_ARB_explicit_attrib_location, GL_ARB_explicit_uniform_location, 
        GL_ARB_fragment_coord_conventions, GL_ARB_fragment_layer_viewport, 
        GL_ARB_fragment_shader, GL_ARB_framebuffer_no_attachments, 
        GL_ARB_framebuffer_object, GL_ARB_framebuffer_sRGB, 
        GL_ARB_get_program_binary, GL_ARB_get_texture_sub_image, 
        GL_ARB_gpu_shader5, GL_ARB_half_float_pixel, GL_ARB_half_float_vertex, 
        GL_ARB_instanced_arrays, GL_ARB_internalformat_query, 
        GL_ARB_internalformat_query2, GL_ARB_invalidate_subdata, 
        GL_ARB_map_buffer_alignment, GL_ARB_map_buffer_range, GL_ARB_multi_bind, 
        GL_ARB_multi_draw_indirect, GL_ARB_occlusion_query2, 
        GL_ARB_pipeline_statistics_query, GL_ARB_pixel_buffer_object, 
        GL_ARB_point_sprite, GL_ARB_program_interface_query, 
        GL_ARB_provoking_vertex, GL_ARB_robustness, GL_ARB_sample_shading, 
        GL_ARB_sampler_objects, GL_ARB_seamless_cube_map, 
        GL_ARB_seamless_cubemap_per_texture, GL_ARB_separate_shader_objects, 
        GL_ARB_shader_atomic_counter_ops, GL_ARB_shader_atomic_counters, 
        GL_ARB_shader_bit_encoding, GL_ARB_shader_clock, 
        GL_ARB_shader_draw_parameters, GL_ARB_shader_image_load_store, 
        GL_ARB_shader_image_size, GL_ARB_shader_objects, 
        GL_ARB_shader_storage_buffer_object, GL_ARB_shader_subroutine, 
        GL_ARB_shader_texture_image_samples, GL_ARB_shader_texture_lod, 
        GL_ARB_shader_viewport_layer_array, GL_ARB_shading_language_420pack, 
        GL_ARB_shading_language_packing, GL_ARB_sync, GL_ARB_tessellation_shader, 
        GL_ARB_texture_barrier, GL_ARB_texture_buffer_object, 
        GL_ARB_texture_buffer_object_rgb32, GL_ARB_texture_buffer_range, 
        GL_ARB_texture_compression_bptc, GL_ARB_texture_compression_rgtc, 
        GL_ARB_texture_cube_map_array, GL_ARB_texture_float, 
        GL_ARB_texture_gather, GL_ARB_texture_mirror_clamp_to_edge, 
        GL_ARB_texture_multisample, GL_ARB_texture_non_power_of_two, 
        GL_ARB_texture_query_levels, GL_ARB_texture_query_lod, 
        GL_ARB_texture_rectangle, GL_ARB_texture_rg, GL_ARB_texture_rgb10_a2ui, 
        GL_ARB_texture_storage, GL_ARB_texture_storage_multisample, 
        GL_ARB_texture_swizzle, GL_ARB_texture_view, GL_ARB_timer_query, 
        GL_ARB_transform_feedback2, GL_ARB_transform_feedback3, 
        GL_ARB_transform_feedback_instanced, GL_ARB_uniform_buffer_object, 
        GL_ARB_vertex_array_bgra, GL_ARB_vertex_array_object, 
        GL_ARB_vertex_attrib_binding, GL_ARB_vertex_shader, 
        GL_ARB_vertex_type_10f_11f_11f_rev, GL_ARB_vertex_type_2_10_10_10_rev, 
        GL_ARB_viewport_array, GL_ATI_blend_equation_separate, 
        GL_ATI_texture_float, GL_EXT_abgr, GL_EXT_blend_equation_separate, 
        GL_EXT_draw_buffers2, GL_EXT_draw_instanced, GL_EXT_framebuffer_blit, 
        GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_multisample_blit_scaled, 
        GL_EXT_framebuffer_sRGB, GL_EXT_packed_depth_stencil, GL_EXT_packed_float, 
        GL_EXT_pixel_buffer_object, GL_EXT_polygon_offset_clamp, 
        GL_EXT_provoking_vertex, GL_EXT_shader_integer_mix, 
        GL_EXT_shader_samples_identical, GL_EXT_texture_array, 
        GL_EXT_texture_compression_dxt1, GL_EXT_texture_compression_rgtc, 
        GL_EXT_texture_compression_s3tc, GL_EXT_texture_filter_anisotropic, 
        GL_EXT_texture_integer, GL_EXT_texture_sRGB, GL_EXT_texture_sRGB_decode, 
        GL_EXT_texture_shared_exponent, GL_EXT_texture_snorm, 
        GL_EXT_texture_swizzle, GL_EXT_timer_query, GL_EXT_transform_feedback, 
        GL_EXT_vertex_array_bgra, GL_IBM_multimode_draw_arrays, 
        GL_KHR_blend_equation_advanced, GL_KHR_context_flush_control, 
        GL_KHR_debug, GL_KHR_robustness, GL_MESA_pack_invert, 
        GL_MESA_shader_integer_functions, GL_MESA_texture_signed_rgba, 
        GL_NV_conditional_render, GL_NV_depth_clamp, GL_NV_packed_depth_stencil, 
        GL_NV_texture_barrier, GL_OES_EGL_image, GL_S3_s3tc
     
    OpenGL version string: 3.0 Mesa 17.0.7
    OpenGL shading language version string: 1.30
    OpenGL context flags: (none)
    OpenGL extensions:
        GL_3DFX_texture_compression_FXT1, GL_AMD_conservative_depth, 
        GL_AMD_draw_buffers_blend, GL_AMD_seamless_cubemap_per_texture, 
        GL_AMD_shader_trinary_minmax, GL_ANGLE_texture_compression_dxt3, 
        GL_ANGLE_texture_compression_dxt5, GL_APPLE_object_purgeable, 
        GL_APPLE_packed_pixels, GL_APPLE_vertex_array_object, 
        GL_ARB_ES2_compatibility, GL_ARB_ES3_compatibility, 
        GL_ARB_arrays_of_arrays, GL_ARB_blend_func_extended, 
        GL_ARB_buffer_storage, GL_ARB_clear_buffer_object, GL_ARB_clear_texture, 
        GL_ARB_clip_control, GL_ARB_color_buffer_float, 
        GL_ARB_compressed_texture_pixel_storage, GL_ARB_compute_shader, 
        GL_ARB_conditional_render_inverted, GL_ARB_conservative_depth, 
        GL_ARB_copy_buffer, GL_ARB_copy_image, GL_ARB_cull_distance, 
        GL_ARB_debug_output, GL_ARB_depth_buffer_float, GL_ARB_depth_clamp, 
        GL_ARB_depth_texture, GL_ARB_derivative_control, GL_ARB_draw_buffers, 
        GL_ARB_draw_buffers_blend, GL_ARB_draw_elements_base_vertex, 
        GL_ARB_draw_instanced, GL_ARB_explicit_attrib_location, 
        GL_ARB_explicit_uniform_location, GL_ARB_fragment_coord_conventions, 
        GL_ARB_fragment_program, GL_ARB_fragment_program_shadow, 
        GL_ARB_fragment_shader, GL_ARB_framebuffer_no_attachments, 
        GL_ARB_framebuffer_object, GL_ARB_framebuffer_sRGB, 
        GL_ARB_get_program_binary, GL_ARB_get_texture_sub_image, 
        GL_ARB_half_float_pixel, GL_ARB_half_float_vertex, 
        GL_ARB_instanced_arrays, GL_ARB_internalformat_query, 
        GL_ARB_internalformat_query2, GL_ARB_invalidate_subdata, 
        GL_ARB_map_buffer_alignment, GL_ARB_map_buffer_range, GL_ARB_multi_bind, 
        GL_ARB_multisample, GL_ARB_multitexture, GL_ARB_occlusion_query, 
        GL_ARB_occlusion_query2, GL_ARB_pipeline_statistics_query, 
        GL_ARB_pixel_buffer_object, GL_ARB_point_parameters, GL_ARB_point_sprite, 
        GL_ARB_program_interface_query, GL_ARB_provoking_vertex, 
        GL_ARB_robustness, GL_ARB_sample_shading, GL_ARB_sampler_objects, 
        GL_ARB_seamless_cube_map, GL_ARB_seamless_cubemap_per_texture, 
        GL_ARB_separate_shader_objects, GL_ARB_shader_atomic_counter_ops, 
        GL_ARB_shader_atomic_counters, GL_ARB_shader_bit_encoding, 
        GL_ARB_shader_clock, GL_ARB_shader_draw_parameters, 
        GL_ARB_shader_image_load_store, GL_ARB_shader_image_size, 
        GL_ARB_shader_objects, GL_ARB_shader_storage_buffer_object, 
        GL_ARB_shader_texture_image_samples, GL_ARB_shader_texture_lod, 
        GL_ARB_shading_language_100, GL_ARB_shading_language_420pack, 
        GL_ARB_shading_language_packing, GL_ARB_shadow, GL_ARB_sync, 
        GL_ARB_texture_barrier, GL_ARB_texture_border_clamp, 
        GL_ARB_texture_compression, GL_ARB_texture_compression_bptc, 
        GL_ARB_texture_compression_rgtc, GL_ARB_texture_cube_map, 
        GL_ARB_texture_cube_map_array, GL_ARB_texture_env_add, 
        GL_ARB_texture_env_combine, GL_ARB_texture_env_crossbar, 
        GL_ARB_texture_env_dot3, GL_ARB_texture_float, GL_ARB_texture_gather, 
        GL_ARB_texture_mirror_clamp_to_edge, GL_ARB_texture_mirrored_repeat, 
        GL_ARB_texture_multisample, GL_ARB_texture_non_power_of_two, 
        GL_ARB_texture_query_levels, GL_ARB_texture_query_lod, 
        GL_ARB_texture_rectangle, GL_ARB_texture_rg, GL_ARB_texture_rgb10_a2ui, 
        GL_ARB_texture_storage, GL_ARB_texture_storage_multisample, 
        GL_ARB_texture_swizzle, GL_ARB_texture_view, GL_ARB_timer_query, 
        GL_ARB_transform_feedback2, GL_ARB_transform_feedback3, 
        GL_ARB_transform_feedback_instanced, GL_ARB_transpose_matrix, 
        GL_ARB_uniform_buffer_object, GL_ARB_vertex_array_bgra, 
        GL_ARB_vertex_array_object, GL_ARB_vertex_attrib_binding, 
        GL_ARB_vertex_buffer_object, GL_ARB_vertex_program, GL_ARB_vertex_shader, 
        GL_ARB_vertex_type_10f_11f_11f_rev, GL_ARB_vertex_type_2_10_10_10_rev, 
        GL_ARB_window_pos, GL_ATI_blend_equation_separate, GL_ATI_draw_buffers, 
        GL_ATI_separate_stencil, GL_ATI_texture_env_combine3, 
        GL_ATI_texture_float, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color, 
        GL_EXT_blend_equation_separate, GL_EXT_blend_func_separate, 
        GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_compiled_vertex_array, 
        GL_EXT_copy_texture, GL_EXT_draw_buffers2, GL_EXT_draw_instanced, 
        GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_blit, 
        GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_multisample_blit_scaled, 
        GL_EXT_framebuffer_object, GL_EXT_framebuffer_sRGB, 
        GL_EXT_gpu_program_parameters, GL_EXT_multi_draw_arrays, 
        GL_EXT_packed_depth_stencil, GL_EXT_packed_float, GL_EXT_packed_pixels, 
        GL_EXT_pixel_buffer_object, GL_EXT_point_parameters, 
        GL_EXT_polygon_offset, GL_EXT_polygon_offset_clamp, 
        GL_EXT_provoking_vertex, GL_EXT_rescale_normal, GL_EXT_secondary_color, 
        GL_EXT_separate_specular_color, GL_EXT_shader_integer_mix, 
        GL_EXT_shader_samples_identical, GL_EXT_shadow_funcs, 
        GL_EXT_stencil_two_side, GL_EXT_stencil_wrap, GL_EXT_subtexture, 
        GL_EXT_texture, GL_EXT_texture3D, GL_EXT_texture_array, 
        GL_EXT_texture_compression_dxt1, GL_EXT_texture_compression_rgtc, 
        GL_EXT_texture_compression_s3tc, GL_EXT_texture_cube_map, 
        GL_EXT_texture_edge_clamp, GL_EXT_texture_env_add, 
        GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3, 
        GL_EXT_texture_filter_anisotropic, GL_EXT_texture_integer, 
        GL_EXT_texture_lod_bias, GL_EXT_texture_object, GL_EXT_texture_rectangle, 
        GL_EXT_texture_sRGB, GL_EXT_texture_sRGB_decode, 
        GL_EXT_texture_shared_exponent, GL_EXT_texture_snorm, 
        GL_EXT_texture_swizzle, GL_EXT_timer_query, GL_EXT_transform_feedback, 
        GL_EXT_vertex_array, GL_EXT_vertex_array_bgra, 
        GL_IBM_multimode_draw_arrays, GL_IBM_rasterpos_clip, 
        GL_IBM_texture_mirrored_repeat, GL_INGR_blend_func_separate, 
        GL_KHR_blend_equation_advanced, GL_KHR_context_flush_control, 
        GL_KHR_debug, GL_KHR_robustness, GL_MESA_pack_invert, 
        GL_MESA_shader_integer_functions, GL_MESA_texture_signed_rgba, 
        GL_MESA_window_pos, GL_NV_blend_square, GL_NV_conditional_render, 
        GL_NV_depth_clamp, GL_NV_light_max_exponent, GL_NV_packed_depth_stencil, 
        GL_NV_primitive_restart, GL_NV_texgen_reflection, GL_NV_texture_barrier, 
        GL_NV_texture_env_combine4, GL_NV_texture_rectangle, GL_OES_EGL_image, 
        GL_OES_read_format, GL_S3_s3tc, GL_SGIS_generate_mipmap, 
        GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp, 
        GL_SGIS_texture_lod, GL_SUN_multi_draw_arrays
     
    OpenGL ES profile version string: OpenGL ES 3.0 Mesa 17.0.7
    OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
    OpenGL ES profile extensions:
        GL_ANGLE_texture_compression_dxt3, GL_ANGLE_texture_compression_dxt5, 
        GL_APPLE_texture_max_level, GL_EXT_blend_func_extended, 
        GL_EXT_blend_minmax, GL_EXT_clip_cull_distance, GL_EXT_color_buffer_float, 
        GL_EXT_discard_framebuffer, GL_EXT_draw_buffers, 
        GL_EXT_draw_buffers_indexed, GL_EXT_draw_elements_base_vertex, 
        GL_EXT_map_buffer_range, GL_EXT_multi_draw_arrays, 
        GL_EXT_polygon_offset_clamp, GL_EXT_read_format_bgra, GL_EXT_robustness, 
        GL_EXT_separate_shader_objects, GL_EXT_shader_integer_mix, 
        GL_EXT_texture_border_clamp, GL_EXT_texture_compression_dxt1, 
        GL_EXT_texture_filter_anisotropic, GL_EXT_texture_format_BGRA8888, 
        GL_EXT_texture_rg, GL_EXT_texture_sRGB_decode, 
        GL_EXT_texture_type_2_10_10_10_REV, GL_EXT_unpack_subimage, 
        GL_KHR_blend_equation_advanced, GL_KHR_context_flush_control, 
        GL_KHR_debug, GL_KHR_robustness, GL_MESA_shader_integer_functions, 
        GL_NV_draw_buffers, GL_NV_fbo_color_attachments, GL_NV_read_buffer, 
        GL_NV_read_depth, GL_NV_read_depth_stencil, GL_NV_read_stencil, 
        GL_OES_EGL_image, GL_OES_EGL_image_external, GL_OES_EGL_sync, 
        GL_OES_compressed_ETC1_RGB8_texture, GL_OES_depth24, GL_OES_depth_texture, 
        GL_OES_depth_texture_cube_map, GL_OES_draw_buffers_indexed, 
        GL_OES_draw_elements_base_vertex, GL_OES_element_index_uint, 
        GL_OES_fbo_render_mipmap, GL_OES_get_program_binary, GL_OES_mapbuffer, 
        GL_OES_packed_depth_stencil, GL_OES_rgb8_rgba8, GL_OES_sample_shading, 
        GL_OES_sample_variables, GL_OES_shader_multisample_interpolation, 
        GL_OES_standard_derivatives, GL_OES_stencil8, GL_OES_surfaceless_context, 
        GL_OES_texture_3D, GL_OES_texture_border_clamp, GL_OES_texture_float, 
        GL_OES_texture_float_linear, GL_OES_texture_half_float, 
        GL_OES_texture_half_float_linear, GL_OES_texture_npot, 
        GL_OES_vertex_array_object, GL_OES_vertex_half_float

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