> Are you using the GLUT emulation layer?
> What visual mode are you requesting?
>
> Just for debugging, try to print the result of the usual
>
> glGetString(GL_VENDOR);
> GL_RENDERER
> GL_EXTENSIONS
>
> calls in your GL programs, in the old program and in the one using FLTK.
> Outputs should match.
>
I have two version using FLTK. One uses FL/glut and the other doesn't. The
other version I use FL/Fl_Gl_Window to utilize OpenGL functions. FL/glut.h was
not included in the later version.
I'm using RGB, Double Buffer Mode, no Depth_test, orthographic view.
This the code I used in my glut program, the only line on set visual mode:
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB );
Following your advices, I call glGetString() in my program.
Get results as below:
In Single Monitor Mode:
All version results are the same:
GL_VENDOR = Intel
GL_RENDERER = Intel 915GM
EXTENSIONS =
GL_ARB_depth_texture
GL_ARB_fragment_program
GL_ARB_multitexture
GL_ARB_point_parameters
GL_ARB_shadow
GL_ARB_texture_border_clamp
GL_ARB_texture_compression
GL_ARB_texture_cube_map
GL_ARB_texture_env_add
GL_ARB_texture_env_combine
GL_ARB_texture_env_dot3
GL_ARB_texture_env_crossbar
GL_ARB_transpose_matrix
GL_ARB_vertex_buffer_object
GL_ARB_vertex_program
GL_ARB_window_pos
GL_EXT_abgr
GL_EXT_bgra
GL_EXT_blend_color
GL_EXT_blend_func_separate
GL_EXT_blend_minmax
GL_EXT_blend_subtract
GL_EXT_clip_volume_hint
GL_EXT_compiled_vertex_array
GL_EXT_cull_vertex
GL_EXT_draw_range_elements
GL_EXT_fog_coord
GL_EXT_multi_draw_arrays
GL_EXT_packed_pixels
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_compression_s3tc
GL_EXT_texture_env_add
GL_EXT_texture_env_combine
GL_EXT_texture_filter_anisotropic
GL_EXT_texture3D
GL_3DFX_texture_compression_FXT1
GL_IBM_texture_mirrored_repeat
GL_NV_blend_square
GL_NV_texgen_reflection
GL_SGIS_generate_mipmap
GL_WIN_swap_hint
But in Dual Monitor Mode:
My two version using FLTK are the same.
GL_VENDOR = Microsoft Corporation
GL_RENDER = GDI Generic
GL_RENDERER = Intel 915GM
EXTENSIONS =
GL_WIN_swap_hint
GL_EXT_bgra
GL_EXT_paletted_texture
While the origin GLUT one returns the same result as in single monitor mode.
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