Prev: How to modify a text value in a xml?
Next: Recommended Reading (also: Arrays/Hashes)
From: Andrea Fazzi on 13 Jan 2010 10:45
Marc-antoine Kruzik wrote:
>
> I remember I have had this kind of problems, trying to use OpenGL.
> Maybe I don't have the right version of one library, or I don't install
> a SDK.

Marc-antoine,

if you're interested in using ffi-opengl, please redirect this bug
report in the proper place, the github issue tracker

http://github.com/remogatto/ffi-opengl/issues

In this way things don't get scattered throughout the net and we can
continue our discussion in the proper place :)

Thank you,
Andrea
--
Posted via http://www.ruby-forum.com/.

From: Phillip Gawlowski on 13 Jan 2010 14:41
On 13.01.2010 10:50, Marc-antoine Kruzik wrote:
> Michael Brooks wrote:
>> I used the the gears.rb as the basis for a OpenGL programmable shader
>> (i.e.
>> GLSL) version of the gears program. The intro to it and download can be
>> found through here:
>>
>> http://osdir.com/ml/ruby-talk/2009-03/msg00749.html
>
> The shaders are nice. Is OpenGL able to use shaders ? Or you made it to
> use shaders your own way ?

OpenGL Shading Language <http://www.opengl.org/documentation/glsl/> at
least allows you to use shaders. In which way, I don't know, however,
you'd have to read teh doc yourself to find out. ;)

--
Phillip Gawlowski

From: Michael Brooks on 13 Jan 2010 14:50
Hello Marc-antoine:

> Michael Brooks wrote:
>> I used the the gears.rb as the basis for a OpenGL programmable shader
>> (i.e.
>> GLSL) version of the gears program. The intro to it and download can be
>> found through here:
>>
>> http://osdir.com/ml/ruby-talk/2009-03/msg00749.html
>
> The shaders are nice. Is OpenGL able to use shaders ? Or you made it to
> use shaders your own way ?

OpenGL has had shaders for quite a while:

http://en.wikipedia.org/wiki/GLSL
http://www.opengl.org/documentation/glsl/

All you need to do is write the shaders and load them into the GPU via
OpenGL's GLSL API.

OpenGL and Microsoft DirectX/3D have been leapfrogging each other for the
past 10 years and the shader capabilities of each are pretty comparable.
Because of OpenGLs extension mechanism OpenGL will sometimes get a feature
before DirectX/3D but unfortunately the acquiring the Pixel Format /
Rendering Context (roughly equivalent to the capability-bits in DirectX/3D)
in OpenGL has gotten really ugly because of that.

Michael




From: Michal Suchanek on 14 Jan 2010 15:50
2010/1/12 Michael Brooks <michael.brooks(a)shaw.ca>:
> Hello Marc-antoine and Brian:
>
>> Marc-antoine Kruzik wrote:
>>>
>>> Hello, I'm french, sorry for my mistakes.
>>> So, I'm looking for the easiest way to use a 3D library with Ruby.
>>> Not especially Ogre.rb, because I just want to do 3D with Ruby. Any 3D
>>> library will be ok. :)
>>
>> Brian Candler wrote:
>> The GL gears example exists for ruby (gears.rb). I have a copy lying
>> around, and it still runs. You should be able to find it through Google.
>
> I used the the gears.rb as the basis for a OpenGL programmable shader (i.e.
> GLSL) version of the gears program.  The intro to it and download can be
> found through here:
>
> http://osdir.com/ml/ruby-talk/2009-03/msg00749.html
>

FWIW this does nt work for me on Linux.

$ ruby gears_using_shaders.rb
Error - The program has terminated because the environment does not
support OpenGL 2.0 or greater GLSL shaders.
$ glxinfo
name of display: :0.0
display: :0 screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.2
server glx extensions:
GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap,
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_copy_sub_buffer,
GLX_OML_swap_method, GLX_SGI_make_current_read, GLX_SGI_swap_control,
GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_visual_select_group
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_import_context,
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_allocate_memory,
GLX_MESA_copy_sub_buffer, GLX_MESA_swap_control,
GLX_MESA_swap_frame_usage, GLX_OML_swap_method, GLX_OML_sync_control,
GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGI_video_sync,
GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
GLX_SGIX_visual_select_group, GLX_EXT_texture_from_pixmap
GLX version: 1.2
GLX extensions:
GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_MESA_copy_sub_buffer,
GLX_MESA_swap_control, GLX_MESA_swap_frame_usage, GLX_OML_swap_method,
GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGI_video_sync,
GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_visual_select_group
OpenGL vendor string: DRI R300 Project
OpenGL renderer string: Mesa DRI R300 (RV515 7153) 20090101 TCL
OpenGL version string: 1.5 Mesa 7.6.1
OpenGL extensions:
GL_ARB_depth_texture, GL_ARB_draw_buffers, GL_ARB_fragment_program,
GL_ARB_imaging, GL_ARB_multisample, GL_ARB_multitexture,
GL_ARB_occlusion_query, GL_ARB_point_parameters, GL_ARB_shadow,
GL_ARB_shadow_ambient, 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_crossbar, GL_ARB_texture_env_dot3,
GL_MESAX_texture_float, GL_ARB_texture_mirrored_repeat,
GL_ARB_texture_rectangle, GL_ARB_transpose_matrix,
GL_ARB_vertex_array_bgra, 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_equation_separate,
GL_EXT_blend_func_separate, GL_EXT_blend_logic_op, GL_EXT_blend_minmax,
GL_EXT_blend_subtract, GL_EXT_compiled_vertex_array, GL_EXT_convolution,
GL_EXT_copy_texture, GL_EXT_draw_range_elements, GL_EXT_fog_coord,
GL_EXT_gpu_program_parameters, GL_EXT_histogram, GL_EXT_multi_draw_arrays,
GL_EXT_packed_depth_stencil, GL_EXT_packed_pixels,
GL_EXT_point_parameters, GL_EXT_polygon_offset, 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_subtexture, GL_EXT_texture, GL_EXT_texture3D,
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_lod_bias,
GL_EXT_texture_mirror_clamp, GL_EXT_texture_object,
GL_EXT_texture_rectangle, GL_EXT_texture_sRGB, GL_EXT_vertex_array,
GL_EXT_vertex_array_bgra, GL_APPLE_packed_pixels,
GL_ATI_blend_equation_separate, GL_ATI_texture_env_combine3,
GL_ATI_texture_mirror_once, GL_ATI_separate_stencil,
GL_IBM_multimode_draw_arrays, GL_IBM_rasterpos_clip,
GL_IBM_texture_mirrored_repeat, GL_INGR_blend_func_separate,
GL_MESA_pack_invert, GL_MESA_ycbcr_texture, GL_MESA_window_pos,
GL_NV_blend_square, GL_NV_light_max_exponent, GL_NV_texture_rectangle,
GL_NV_texgen_reflection, GL_NV_vertex_program, GL_OES_read_format,
GL_SGI_color_matrix, GL_SGI_color_table, GL_SGIS_generate_mipmap,
GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp,
GL_SGIS_texture_lod, GL_SUN_multi_draw_arrays

visual x bf lv rg d st colorbuffer ax dp st accumbuffer ms cav
id dep cl sp sz l ci b ro r g b a bf th cl r g b a ns b eat
----------------------------------------------------------------------
0x21 24 tc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x22 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x67 24 tc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 0 0 Slow
0x68 24 tc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 Slow
0x69 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 0 0 None
0x6a 24 dc 0 32 0 r . . 8 8 8 8 0 24 8 16 16 16 16 0 0 Slow
0x6b 24 dc 0 32 0 r y . 8 8 8 8 0 24 8 16 16 16 16 0 0 Slow
0x5e 32 tc 0 32 0 r . . 8 8 8 8 0 24 8 0 0 0 0 0 0 Ncon

From: brabuhr on 14 Jan 2010 16:38
>> I used the the gears.rb as the basis for a OpenGL programmable shader (ie.
>> GLSL) version of the gears program.  The intro to it and download can be
>> found through here:
>>
>> http://osdir.com/ml/ruby-talk/2009-03/msg00749.html
>
> FWIW this does nt work for me on Linux.
>
> $ ruby gears_using_shaders.rb
> Error - The program has terminated because the environment does not
> support OpenGL 2.0 or greater GLSL shaders.

"To run GLSL you need the GL_ARB_shading_language_100 extension."[1]

On my system:

$ glxinfo | fgrep shading
GL_ARB_shadow, GL_ARB_shader_objects, GL_ARB_shading_language_100,

[1] http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=253236

First  |  Prev  |  Next  |  Last
Pages: 1 2 3 4 5
Prev: How to modify a text value in a xml?
Next: Recommended Reading (also: Arrays/Hashes)