#473 Clipping/ Z-buffer error

Rendering Error
open
ATI OpenGL (71)
5
2003-05-12
2003-04-30
No

I have a very starange problem. I was using Red Hat
8.0, mesa 4 i think, and it was fine.

With RedHat 9.0 mesa 4.0.4, when playing Quake3 or
other OpenGL games, the shadows beneath the characters
and the decals such as blood show thorough the walls.
The shadows seem to be drawn even when they should not
be visible, thus I get an unfair advantage as I can see
players around the corner before they know I am there,
via the shadow.

It may be a Z/W-buffer problem, as the depth may not be
correctly calculated, not sure.

Has anyone ever had this problem before?? Any help is
appreciated. Is it the driver?

Look at the attached picture, RTCW shows the blood of a
dead soldier through the wall i am standing against.

Thanks.

Here is the output of GLXInfo:

direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.2
server glx extensions:
GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_EXT_import_context
client glx vendor string: SGI
client glx version string: 1.2
client glx extensions:
GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_EXT_import_context
GLX extensions:
GLX_EXT_visual_info, GLX_EXT_visual_rating,
GLX_EXT_import_context
OpenGL vendor string: VA Linux Systems, Inc.
OpenGL renderer string: Mesa DRI Rage128 20020221 M3
AGP 2x x86/MMX/SSE
OpenGL version string: 1.2 Mesa 4.0.4
OpenGL extensions:
GL_ARB_imaging, GL_ARB_multitexture,
GL_ARB_texture_env_add,
GL_ARB_transpose_matrix, GL_EXT_abgr, GL_EXT_bgra,
GL_EXT_blend_color,
GL_EXT_blend_minmax, GL_EXT_blend_subtract,
GL_EXT_clip_volume_hint,
GL_EXT_convolution, GL_EXT_compiled_vertex_array,
GL_EXT_histogram,
GL_EXT_packed_pixels, GL_EXT_polygon_offset,
GL_EXT_rescale_normal,
GL_EXT_texture3D, GL_EXT_texture_env_add,
GL_EXT_texture_object,
GL_EXT_vertex_array, GL_IBM_rasterpos_clip,
GL_MESA_window_pos,
GL_NV_texgen_reflection, GL_SGI_color_matrix,
GL_SGI_color_table
glu version: 1.3
glu extensions:
GLU_EXT_nurbs_tessellator, GLU_EXT_object_space_tess

Discussion

  • Avtar Raikmo

    Avtar Raikmo - 2003-05-12

    Logged In: YES
    user_id=768084

    I have taken the latest drivers from dri.sourceforge.net but
    they still do not solve the problem.

    The old drivers for red hat 8.0 worked perfectly, so i don't
    know where this problem has arisen from.

    Help appreciated.

     
  • Avtar Raikmo

    Avtar Raikmo - 2003-05-12
    • assigned_to: nobody --> idr
     
  • Avtar Raikmo

    Avtar Raikmo - 2003-05-13

    Logged In: YES
    user_id=768084

    OpenGL renderer string: Mesa DRI Rage128 20010405 M3 AGP 1x
    x86/MMX/SSE
    OpenGL version string: 1.2 Mesa 3.4.2

    From Red Hat 8.0, this works perfectly.

     

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