1

这是一个大问题：首先，虽然我对 XLib API有所了解，但我想测试并确保在我做任何事情之前我实际上可以创建一个 OpenGL 渲染上下文（3.0），因此我只是复制并粘贴一些测试代码并运行它。

当我运行代码时，我的输出如下：

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_multithread_makecurrent GLX_MESA_swap_control 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 
Getting framebuffer config
Getting XVisualInfo
Creating colormap
Creating window
Mapping window
Creating context
X Error of failed request:  BadRequest (invalid request code or no such operation)
  Major opcode of failed request:  152 (GLX)
  Minor opcode of failed request:  34 ()
  Serial number of failed request:  27
  Current serial number in output stream:  26

此外，随后调用glxinfo生产 

name of display: :0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
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_swap_control, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
    GLX_INTEL_swap_event
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_framebuffer_sRGB, 
    GLX_EXT_create_context_es2_profile, GLX_MESA_copy_sub_buffer, 
    GLX_MESA_multithread_makecurrent, GLX_MESA_swap_control, 
    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_INTEL_swap_event
GLX version: 1.4
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_multithread_makecurrent, GLX_MESA_swap_control, 
    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
OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Mobile 
OpenGL version string: 3.0 Mesa 8.0
OpenGL shading language version string: 1.30
OpenGL 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_framebuffer_sRGB, GL_ARB_multitexture, 
    GL_EXT_framebuffer_sRGB, 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_SUN_multi_draw_arrays, GL_ARB_texture_border_clamp, 
    GL_ARB_texture_compression, GL_EXT_framebuffer_object, 
    GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3, GL_MESA_window_pos, 
    GL_NV_packed_depth_stencil, GL_NV_texture_rectangle, GL_NV_vertex_program, 
    GL_ARB_depth_texture, GL_ARB_occlusion_query, 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_ATI_envmap_bumpmap, GL_EXT_stencil_two_side, 
    GL_EXT_texture_cube_map, GL_NV_depth_clamp, GL_NV_vertex_program1_1, 
    GL_APPLE_packed_pixels, GL_APPLE_vertex_array_object, 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_ATI_texture_float, GL_EXT_shadow_funcs, 
    GL_EXT_stencil_wrap, GL_MESA_pack_invert, GL_MESA_ycbcr_texture, 
    GL_ARB_depth_clamp, GL_ARB_fragment_program_shadow, 
    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_color_buffer_float, GL_ARB_pixel_buffer_object, 
    GL_ARB_texture_compression_rgtc, GL_ARB_texture_float, 
    GL_ARB_texture_rectangle, GL_EXT_packed_float, GL_EXT_pixel_buffer_object, 
    GL_EXT_texture_compression_rgtc, GL_EXT_texture_rectangle, 
    GL_EXT_texture_sRGB, GL_EXT_texture_shared_exponent, 
    GL_ARB_framebuffer_object, GL_EXT_framebuffer_blit, 
    GL_EXT_framebuffer_multisample, GL_EXT_packed_depth_stencil, 
    GL_APPLE_object_purgeable, GL_ARB_vertex_array_object, 
    GL_ATI_separate_stencil, GL_EXT_draw_buffers2, 
    GL_EXT_gpu_program_parameters, GL_EXT_texture_array, 
    GL_EXT_texture_integer, GL_EXT_texture_sRGB_decode, GL_EXT_timer_query, 
    GL_OES_EGL_image, GL_MESA_texture_array, GL_ARB_copy_buffer, 
    GL_ARB_depth_buffer_float, GL_ARB_half_float_vertex, 
    GL_ARB_map_buffer_range, GL_ARB_texture_rg, GL_ARB_texture_swizzle, 
    GL_ARB_vertex_array_bgra, GL_EXT_separate_shader_objects, 
    GL_EXT_texture_swizzle, GL_EXT_vertex_array_bgra, 
    GL_NV_conditional_render, GL_ARB_ES2_compatibility, 
    GL_ARB_draw_elements_base_vertex, GL_ARB_explicit_attrib_location, 
    GL_ARB_fragment_coord_conventions, GL_ARB_provoking_vertex, 
    GL_ARB_sampler_objects, GL_ARB_seamless_cube_map, 
    GL_ARB_shader_texture_lod, GL_EXT_provoking_vertex, GL_EXT_texture_snorm, 
    GL_MESA_texture_signed_rgba, GL_ARB_robustness, GL_EXT_transform_feedback

32 GLX Visuals
    visual  x   bf lv rg d st  colorbuffer  sr ax dp st accumbuffer  ms  cav
  id dep cl sp  sz l  ci b ro  r  g  b  a F gb bf th cl  r  g  b  a ns b eat

根据这个规范，我的可能应该工作 - 对吗？如果没有，我能做些什么来改变它？我读过的任何有关此类问题的论坛帖子通常都是由于人们在尝试初始化上下文时缺乏正确的 OpenGL 3.x 实现，这导致他们的输出与我测试过的代码相似.

我还为我的发行版搜索了各种 X11 包，以查看我是否可能会或可能不会错过一些偶然的东西。当然，这是徒劳的，因为我最终安装/更改的任何东西要么让事情变得更糟，要么根本不起作用。

xorg.conf

Section "Module"
    SubSection  "extmod"
       Option    "omit xfree86-dga"
    EndSubSection
    Load    "i2c"
    Load    "ddc"
    Load    "vbe"
    Load    "dri"
    Load    "glx"
    Load    "synaptics"
    Load    "drm"
EndSection

Section "ServerFlags"
     Option    "AllowMouseOpenFail"    "true"
EndSection

Section "Monitor"
    Identifier    "Generic Monitor"
    VertRefresh    43 - 60
    HorizSync      28 - 80
EndSection


Section "Device"

    Identifier  "SabayonVga0"
    Driver      "intel"
    #BusID    "PCI:00:02"
    #Option "RenderAccel" "on"
    #Option "XAANoOffscreenPixmaps"
    #Option "BusType" "PCI"
    #Option "ColorTiling" "on"
    #Option "EnablePageFlip" "on"
    # UseEvents is causing segmentation faults with
    # NVIDIA 6xxx, 7xxx and >=275.xx.xx drivers
    #Option "UseEvents" "True"
    Option "LogoPath" "/usr/share/backgrounds/sabayonlinux-nvidia.png"

EndSection



Section "Screen"

    Identifier    "Screen 0"
    Device        "SabayonVga0"
    Monitor       "Generic Monitor"
    Option       "AddARGBGLXVisuals" "true"

    DefaultDepth 24

    SubSection "Display"
        Depth       8
        ViewPort    0 0
        #Modes      "1024x768" "800x600" "640x480"
    EndSubsection

    SubSection "Display"
        Depth           16
        ViewPort        0 0
        #Modes      "1024x768" "800x600" "640x480"
    EndSubsection

    SubSection "Display"
        Depth           24
        ViewPort        0 0
        #Modes      "1024x768" "800x600" "640x480"
    EndSubsection

EndSection


Section "DRI"
    Mode 0666
EndSection

Section "ServerLayout"
    Identifier   "Main Layout"
    Screen 0    "Screen 0"
EndSection

Section "Extensions"
   #Option "Composite" "Enable"
EndSection

执行代码

#include <GL/glx.h>
#include <GL/gl.h>
#include <unistd.h>
#include <iostream>

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#define GLX_CONTEXT_MAJOR_VERSION_ARB       0x2091
#define GLX_CONTEXT_MINOR_VERSION_ARB       0x2092
typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*);

int main (int argc, char ** argv)
{
    Display *display = XOpenDisplay(0);

    glXCreateContextAttribsARBProc glXCreateContextAttribsARB = NULL;

    const char *extensions = glXQueryExtensionsString(display, DefaultScreen(display));
    std::cout << extensions << std::endl;

    static int visual_attribs[] =
    {
        GLX_RENDER_TYPE, GLX_RGBA_BIT,
        GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
        GLX_DOUBLEBUFFER, true,
        GLX_RED_SIZE, 1,
        GLX_GREEN_SIZE, 1,
        GLX_BLUE_SIZE, 1,
        None
     };

    std::cout << "Getting framebuffer config" << std::endl;
    int fbcount;
    GLXFBConfig *fbc = glXChooseFBConfig(display, DefaultScreen(display), visual_attribs, &fbcount);
    if (!fbc)
    {
        std::cout << "Failed to retrieve a framebuffer config" << std::endl;
        return 1;
    }

    std::cout << "Getting XVisualInfo" << std::endl;
    XVisualInfo *vi = glXGetVisualFromFBConfig(display, fbc[0]);

    XSetWindowAttributes swa;
    std::cout << "Creating colormap" << std::endl;
    swa.colormap = XCreateColormap(display, RootWindow(display, vi->screen), vi->visual, AllocNone);
    swa.border_pixel = 0;
    swa.event_mask = StructureNotifyMask;

    std::cout << "Creating window" << std::endl;
    Window win = XCreateWindow(display, RootWindow(display, vi->screen), 0, 0, 100, 100, 0, vi->depth, InputOutput, vi->visual, CWBorderPixel|CWColormap|CWEventMask, &swa);
    if (!win)
    {
        std::cout << "Failed to create window." << std::endl;
        return 1;
    }

    std::cout << "Mapping window" << std::endl;
    XMapWindow(display, win);

    // Create an oldstyle context first, to get the correct function pointer for glXCreateContextAttribsARB
    GLXContext ctx_old = glXCreateContext(display, vi, 0, GL_TRUE);
    glXCreateContextAttribsARB =  (glXCreateContextAttribsARBProc)glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB");
    glXMakeCurrent(display, 0, 0);
    glXDestroyContext(display, ctx_old);

    if (glXCreateContextAttribsARB == NULL)
    {
        std::cout << "glXCreateContextAttribsARB entry point not found. Aborting." << std::endl;
        return false;
    }

    static int context_attribs[] =
    {
        GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
        GLX_CONTEXT_MINOR_VERSION_ARB, 0,
        None
    };

    std::cout << "Creating context" << std::endl;
    GLXContext ctx = glXCreateContextAttribsARB(display, fbc[0], NULL, true, context_attribs);
    if (!ctx)
    {
        std::cout << "Failed to create GL3 context." << std::endl;
        return 1;
    }

    std::cout << "Making context current" << std::endl;
    glXMakeCurrent(display, win, ctx);

        glClearColor (0, 0.5, 1, 1);
        glClear (GL_COLOR_BUFFER_BIT);
        glXSwapBuffers (display, win);

        sleep(1);

        glClearColor (1, 0.5, 0, 1);
        glClear (GL_COLOR_BUFFER_BIT);
        glXSwapBuffers (display, win);

        sleep(1);

    ctx = glXGetCurrentContext();
    glXMakeCurrent(display, 0, 0);
    glXDestroyContext(display, ctx);
}

我很困惑这是怎么发生的。有人可以为这个问题提供一些见解和/或解决方案吗？

4

1 回答 1

1

该程序在我的系统上运行没有错误。

猜测一下，被 ld.so 链接到可执行文件的库对于 X11 服务器来说是错误的。

尝试ldd <your program>查找 libGL.so 的行，例如：

    libGL.so.1 => /usr/lib/nvidia-current/libGL.so.1 (0x00007f9d4bdf5000)

如果该库不是您系统的正确库，则任何事情都可能发生。X11“无效操作码”错误的可能性更大。

另外，使用GLEW。它负责定位 GL 调用等细节。

于 2012-04-08T07:43:16.120 回答