Problems with simple openGL app

Paul Ledbetter III ledbetter.paul at gmail.com
Fri Apr 1 13:43:26 PST 2005


Hello,
   I am having troubles running this simple openGL application on
FreeBSD 5.3.  The object of the code is simply to create a window and
clear it with the black color.  The code compiles fine, but when I run
the application, the outside of the window appears, but contains
whatever was on the screen before the window appears, and carries this
around if I move the window.   I am at a loss as to why this is
occuring.The program is this:

/* simple.c 

   Compiled with 
cc -I/usr/X11R6/include -c simple.c -o simple.o
cc  -L/usr/X11R6/lib  -lglut -lGLU -lGL -lXmu -lX11 simple.o -o simple

*/

#include <GL/glut.h>

void display(void)
{
     glClear(GL_COLOR_BUFFER_BIT);
    
     glFlush();
}

int main(int argc, char** argv)
{
     float box = 2.0;

     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
     glutCreateWindow("simple");

     glClearColor(0.0, 0.0, 0.0, 0.0);
     gluOrtho2D(-box, box, -box, box);



     glutDisplayFunc(display);
     glutMainLoop();

}


My glxinfo output is :
> glxinfo
name of display: :0.0
display: :0  screen: 0
direct rendering: No
server glx vendor string: SGI
server glx version string: 1.2
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_visual_info, GLX_EXT_visual_rating,
    GLX_EXT_import_context, GLX_SGI_make_current_read, GLX_SGIS_multisample
client glx vendor string: SGI
client glx version string: 1.2
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_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_visual_select_group
GLX extensions:
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGI_make_current_read,
    GLX_SGIS_multisample
OpenGL vendor string: Mesa project: www.mesa3d.org
OpenGL renderer string: Mesa GLX Indirect
OpenGL version string: 1.2 (1.4 Mesa 5.0.2)
OpenGL extensions:
    GL_ARB_depth_texture, GL_ARB_imaging, GL_ARB_multitexture,
    GL_ARB_point_parameters, GL_ARB_shadow, GL_ARB_shadow_ambient,
    GL_ARB_texture_border_clamp, 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_ARB_texture_mirrored_repeat, GL_ARB_transpose_matrix,
    GL_ARB_window_pos, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color,
    GL_EXT_blend_func_separate, GL_EXT_blend_logic_op, GL_EXT_blend_minmax,
    GL_EXT_blend_subtract, GL_EXT_clip_volume_hint, GL_EXT_copy_texture,
    GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_multi_draw_arrays,
    GL_EXT_packed_pixels, 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_lod_bias, GL_EXT_texture_object, GL_EXT_texture_rectangle,
    GL_EXT_vertex_array, GL_APPLE_packed_pixels, GL_ATI_texture_mirror_once,
    GL_ATI_texture_env_combine3, GL_IBM_texture_mirrored_repeat,
    GL_MESA_pack_invert, GL_MESA_ycbcr_texture, GL_NV_blend_square,
    GL_NV_point_sprite, GL_NV_texgen_reflection, GL_NV_texture_rectangle,
    GL_SGIS_generate_mipmap, GL_SGIS_texture_border_clamp,
    GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod, GL_SGIX_depth_texture,
    GL_SGIX_shadow, GL_SGIX_shadow_ambient
glu version: 1.3
glu extensions:
    GLU_EXT_nurbs_tessellator, GLU_EXT_object_space_tess

   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
----------------------------------------------------------------------
0x23 16 tc  0 16  0 r  y  .  5  6  5  0  0 16  0  0  0  0  0  0 0 None
0x24 16 tc  0 16  0 r  y  .  5  6  5  0  0 16  8 16 16 16  0  0 0 None
0x25 16 tc  0 24  0 r  y  .  5  6  5  8  0 16  8 16 16 16 16  0 0 None
0x26 16 tc  0 24  0 r  .  .  5  6  5  8  0 16  8 16 16 16 16  0 0 None
0x27 16 dc  0 16  0 r  y  .  5  6  5  0  0 16  0  0  0  0  0  0 0 None
0x28 16 dc  0 16  0 r  y  .  5  6  5  0  0 16  8 16 16 16  0  0 0 None
0x29 16 dc  0 24  0 r  y  .  5  6  5  8  0 16  8 16 16 16 16  0 0 None
0x2a 16 dc  0 24  0 r  .  .  5  6  5  8  0 16  8 16 16 16 16  0 0 None


My video card is a radeon mobility.  I think the glx module is not
configured to use it, but I hope that is another issue.

Paul Ledbetter


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