[Octave-bug-tracker] [bug #53478] Default linewidth is too thin, can also make legend inaccurate

[Mayeul Cantan]

Follow-up Comment #4, bug #53478 (project octave):

Thank you for your answer, I didn't realize this could be an OpenGL problem.
This is indeed an old computer with OpenGL 1.4/GLSL 1.20

Launching Octave with this works around the problem:

LIBGL_ALWAYS_SOFTWARE=true octave


Otherwise, both of your options help a bit, I am not yet sure which is best,
but I'll probably use the software renderer when working on this computer, as
long as the performance is satisfying.

In case anyone has the same problem, here is some more detailed information
about the CPU/GPU:


% cat /proc/cpuinfo
[...] model name      : Intel(R) Atom(TM) CPU N270   @ 1.60GHz
% glinfo
GL_VERSION: 1.4 Mesa 17.3.6
GL_RENDERER: Mesa DRI Intel(R) 945GME x86/MMX/SSE2
GL_VENDOR: Intel Open Source Technology Center
GL_EXTENSIONS: GL_ARB_multisample GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color
GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_copy_texture
GL_EXT_polygon_offset GL_EXT_subtexture GL_EXT_texture_object
GL_EXT_vertex_array GL_EXT_compiled_vertex_array GL_EXT_texture
GL_EXT_texture3D GL_IBM_rasterpos_clip GL_ARB_point_parameters
GL_EXT_draw_range_elements GL_EXT_packed_pixels GL_EXT_point_parameters
GL_EXT_rescale_normal GL_EXT_separate_specular_color GL_EXT_texture_edge_clamp
GL_SGIS_generate_mipmap GL_SGIS_texture_border_clamp
GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod GL_ARB_multitexture
GL_IBM_multimode_draw_arrays GL_IBM_texture_mirrored_repeat
GL_3DFX_texture_compression_FXT1 GL_ARB_texture_cube_map
GL_ARB_texture_env_add GL_ARB_transpose_matrix GL_EXT_blend_func_separate
GL_EXT_fog_coord GL_EXT_multi_draw_arrays GL_EXT_secondary_color
GL_EXT_texture_env_add GL_EXT_texture_filter_anisotropic
GL_EXT_texture_lod_bias GL_INGR_blend_func_separate GL_NV_blend_square
GL_NV_light_max_exponent GL_NV_texgen_reflection GL_NV_texture_env_combine4
GL_S3_s3tc GL_SUN_multi_draw_arrays GL_ARB_texture_border_clamp
GL_ARB_texture_compression GL_EXT_framebuffer_object
GL_EXT_texture_compression_s3tc GL_EXT_texture_env_combine
GL_EXT_texture_env_dot3 GL_MESA_window_pos GL_NV_packed_depth_stencil
GL_NV_texture_rectangle GL_ARB_depth_texture GL_ARB_shadow
GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3
GL_ARB_texture_mirrored_repeat GL_ARB_window_pos GL_EXT_stencil_two_side
GL_EXT_texture_cube_map GL_APPLE_packed_pixels GL_ARB_draw_buffers
GL_ARB_fragment_program GL_ARB_fragment_shader GL_ARB_shader_objects
GL_ARB_vertex_program GL_ARB_vertex_shader GL_ATI_draw_buffers
GL_ATI_texture_env_combine3 GL_EXT_shadow_funcs GL_EXT_stencil_wrap
GL_MESA_pack_invert GL_MESA_ycbcr_texture GL_ARB_half_float_pixel
GL_ARB_point_sprite GL_ARB_shading_language_100 GL_ARB_sync
GL_ARB_texture_non_power_of_two GL_ARB_vertex_buffer_object
GL_ATI_blend_equation_separate GL_EXT_blend_equation_separate
GL_OES_read_format GL_ARB_pixel_buffer_object GL_ARB_texture_rectangle
GL_EXT_pixel_buffer_object GL_EXT_texture_compression_dxt1
GL_EXT_texture_rectangle GL_EXT_texture_sRGB GL_ARB_framebuffer_object
GL_EXT_framebuffer_blit GL_EXT_packed_depth_stencil GL_APPLE_object_purgeable
GL_ARB_vertex_array_object GL_ATI_separate_stencil
GL_EXT_gpu_program_parameters GL_EXT_texture_sRGB_decode GL_OES_EGL_image
GL_ARB_copy_buffer GL_ARB_map_buffer_range GL_ARB_ES2_compatibility
GL_ARB_debug_output GL_ARB_draw_elements_base_vertex
GL_ARB_explicit_attrib_location GL_ARB_provoking_vertex GL_ARB_sampler_objects
GL_EXT_provoking_vertex GL_ARB_get_program_binary GL_ARB_robustness
GL_ARB_separate_shader_objects GL_ANGLE_texture_compression_dxt3
GL_ANGLE_texture_compression_dxt5 GL_ARB_compressed_texture_pixel_storage
GL_ARB_internalformat_query GL_ARB_map_buffer_alignment GL_ARB_texture_storage
GL_AMD_shader_trinary_minmax GL_ARB_clear_buffer_object
GL_ARB_explicit_uniform_location GL_ARB_invalidate_subdata
GL_ARB_program_interface_query GL_ARB_vertex_attrib_binding GL_KHR_debug
GL_ARB_multi_bind GL_ARB_get_texture_sub_image GL_KHR_context_flush_control
GL_KHR_no_error 
GL_SHADING_LANGUAGE_VERSION = 1.20
GLU_VERSION: 1.3
GLU_EXTENSIONS: GLU_EXT_nurbs_tessellator GLU_EXT_object_space_tess 
GLUT_API_VERSION: 4
GLUT_XLIB_IMPLEMENTATION: 13


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