[Interest] multiple displaying backends on OS X?

Mon Jan 26 00:23:28 CET 2015

On Sunday January 25 2015 20:54:29 Thiago Macieira wrote:

> No, it's the other way around. libX11 is implemented using libxcb.

Indeed. Heh, did I mention technological progress? I've been using X11 since 1990 or so, and never ran into xcb until recently, so it didn't even occur to me that xcb could *not* be built atop X11 :)

> 
> The glX* functions are in libGL. Make sure your platform provides GLX support 
> in the OpenGL libraries.

As I said, there is OpenGL support in X11 on OS X. It's a near complete XOrg.org implementation, and Qt 4 works just fine with it up to 4.4.3 or so.

#> glxinfo
> name of display: :0.0
> 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_multisample, GLX_EXT_import_context, GLX_EXT_visual_info,
>     GLX_EXT_visual_rating, GLX_OML_swap_method, GLX_SGIS_multisample,
>     GLX_SGIX_fbconfig
> 
> client glx vendor string: Mesa Project and SGI
> client glx version string: 1.4
> 
> client glx extensions:
>     GLX_ARB_get_proc_address, GLX_ARB_multisample, 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_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_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
>     GLX_EXT_visual_info, GLX_EXT_visual_rating,
>     GLX_MESA_multithread_makecurrent, GLX_OML_swap_method,
>     GLX_SGIS_multisample, GLX_SGIX_fbconfig
> 
> OpenGL vendor string: Intel Inc.
> OpenGL renderer string: Intel HD Graphics 3000 OpenGL Engine
> OpenGL version string: 2.1 INTEL-8.24.16
> OpenGL shading language version string: 1.20
> 
> OpenGL extensions:
>     GL_APPLE_aux_depth_stencil, GL_APPLE_client_storage,
>     GL_APPLE_element_array, GL_APPLE_fence, GL_APPLE_float_pixels,
>     GL_APPLE_flush_buffer_range, GL_APPLE_flush_render,
>     GL_APPLE_object_purgeable, GL_APPLE_packed_pixels,
>     GL_APPLE_pixel_buffer,
>     GL_APPLE_rgb_422, GL_APPLE_row_bytes, GL_APPLE_specular_vector,
>     GL_APPLE_texture_range, GL_APPLE_transform_hint,
>     GL_APPLE_vertex_array_object, GL_APPLE_vertex_array_range,
>     GL_APPLE_vertex_point_size, GL_APPLE_vertex_program_evaluators,
>     GL_APPLE_ycbcr_422, GL_ARB_color_buffer_float,
>     GL_ARB_depth_buffer_float,
>     GL_ARB_depth_clamp, GL_ARB_depth_texture, GL_ARB_draw_buffers,
>     GL_ARB_draw_elements_base_vertex, GL_ARB_draw_instanced,
>     GL_ARB_fragment_program, GL_ARB_fragment_program_shadow,
>     GL_ARB_fragment_shader, GL_ARB_framebuffer_object,
>     GL_ARB_framebuffer_sRGB, GL_ARB_half_float_pixel,
>     GL_ARB_half_float_vertex, GL_ARB_instanced_arrays, GL_ARB_multisample,
>     GL_ARB_multitexture, GL_ARB_occlusion_query, GL_ARB_pixel_buffer_object,
>     GL_ARB_point_parameters, GL_ARB_point_sprite, GL_ARB_provoking_vertex,
>     GL_ARB_seamless_cube_map, GL_ARB_shader_objects,
>     GL_ARB_shader_texture_lod, GL_ARB_shading_language_100, GL_ARB_shadow,
>     GL_ARB_sync, GL_ARB_texture_border_clamp, GL_ARB_texture_compression,
>     GL_ARB_texture_compression_rgtc, GL_ARB_texture_cube_map,
>     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_mirrored_repeat,
>     GL_ARB_texture_non_power_of_two, GL_ARB_texture_rectangle,
>     GL_ARB_texture_rg, GL_ARB_transpose_matrix, GL_ARB_vertex_array_bgra,
>     GL_ARB_vertex_blend, GL_ARB_vertex_buffer_object, GL_ARB_vertex_program,
>     GL_ARB_vertex_shader, GL_ARB_window_pos, GL_ATI_separate_stencil,
>     GL_ATI_texture_env_combine3, GL_ATI_texture_float,
>     GL_ATI_texture_mirror_once, 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_clip_volume_hint,
>     GL_EXT_debug_label, GL_EXT_debug_marker, GL_EXT_draw_buffers2,
>     GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_blit,
>     GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_object,
>     GL_EXT_framebuffer_sRGB, GL_EXT_geometry_shader4,
>     GL_EXT_gpu_program_parameters, GL_EXT_gpu_shader4,
>     GL_EXT_multi_draw_arrays, GL_EXT_packed_depth_stencil,
>     GL_EXT_packed_float, GL_EXT_provoking_vertex, GL_EXT_rescale_normal,
>     GL_EXT_secondary_color, GL_EXT_separate_specular_color,
>     GL_EXT_shadow_funcs, GL_EXT_stencil_two_side, GL_EXT_stencil_wrap,
>     GL_EXT_texture_array, GL_EXT_texture_compression_dxt1,
>     GL_EXT_texture_compression_s3tc, GL_EXT_texture_env_add,
>     GL_EXT_texture_filter_anisotropic, GL_EXT_texture_integer,
>     GL_EXT_texture_lod_bias, GL_EXT_texture_rectangle, GL_EXT_texture_sRGB,
>     GL_EXT_texture_sRGB_decode, GL_EXT_texture_shared_exponent,
>     GL_EXT_timer_query, GL_EXT_transform_feedback, GL_EXT_vertex_array_bgra,
>     GL_IBM_rasterpos_clip, GL_NV_blend_square, GL_NV_conditional_render,
>     GL_NV_depth_clamp, GL_NV_fog_distance, GL_NV_light_max_exponent,
>     GL_NV_texgen_reflection, GL_NV_texture_barrier, GL_SGIS_generate_mipmap,
>     GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod
> 
> 80 GLX Visuals

R.