retval retained wgl ARB_buffer_region ARB_extensions_string ARB_pixel_format ARB_make_current_read ARB_pbuffer ARB_render_texture ARB_pixel_format_float EXT_display_color_table EXT_extensions_string EXT_make_current_read EXT_pbuffer EXT_pixel_format EXT_swap_control OML_sync_control I3D_digital_video_control I3D_gamma I3D_genlock I3D_image_buffer I3D_swap_frame_lock I3D_swap_frame_usage NV_vertex_array_range 3DL_stereo_control NV_swap_group NV_video_output NV_present_video ARB_create_context NV_gpu_affinity AMD_gpu_association NV_video_capture NV_copy_image ARB_framebuffer_sRGB NV_DX_interop