glGenBuffers與分段故障崩潰

Question

我想不通爲什麼它不斷glGenBuffers

崩潰

GDB回溯給了我這個

#0 0x00000000 in ??() 
#1 0x0808701d in setupBuffers() at main_scene.cc:250 
#2 0x08088cf8 in main (argc=1, argv=0xbffff3c4) at main_scene.cc:694 

這裏是我的main（）

int main(int argc, char **argv) { 

    glutInit(&argc, argv); 
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); 
    glutInitWindowSize(WINDOW_WIDTH, WINDOW_HEIGHT); 
    glutInitWindowPosition(20, 20); 

    glutCreateWindow("New Window"); 

    GLenum err = glewInit(); 
    if (GLEW_OK != err) 
    { 
     /* glewInit failed, something is seriously wrong */ 
     fprintf(stderr, "Error: %s\n", glewGetErrorString(err)); 
    } 
    setupBuffers(); 

    ... 

    /* set callback functions */ 
    glutReshapeFunc (reshape); 
    glutDisplayFunc (display); 
    glutKeyboardFunc(input); 
    glutIdleFunc (idle); 

    glutMainLoop(); 
    return 0; 
} 

這裏是我的setupBuffers（）方法

void setupBuffers() { 
    GLenum errorCode = 0; 

    // Normal 
    size_t normal_buffer_size = 0; // Calc buffer size needed 
    for (size_t i = 0; i < shapes.size(); i++) { 
     normal_buffer_size += sizeof(float) * shapes[i].mesh.normals.size(); 
    } 

    glGenBuffers(1, &normal_buffer); 
    glBindBuffer(GL_ARRAY_BUFFER, normal_buffer); 
    glBufferData(GL_ARRAY_BUFFER, normal_buffer_size, NULL, GL_STATIC_DRAW); 
    normal_buffer_size = 0; 
    for (size_t i = 0; i < shapes.size(); i++) { 
     glBufferSubData(GL_ARRAY_BUFFER, normal_buffer_size, sizeof(float) * shapes[i].mesh.normals.size(), &shapes[i].mesh.normals[0]); // Add the buffer data 
     normal_buffer_size += sizeof(float) * shapes[i].mesh.normals.size(); 
    } 
    glBindBuffer(GL_ARRAY_BUFFER, 0); 

    ... 

    // draw multiple objects with one draw call 
    glGenVertexArrays(1, &vertex_array_object); 
    glBindVertexArray(vertex_array_object); 
    glBindBuffer(GL_ARRAY_BUFFER, normal_buffer); 
    glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer); 
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer); 
    glBindVertexArray(0); 

    errorCode = glGetError(); 
    if (errorCode != 0) { 
     fprintf(stderr, "Error data: %s, code %d\n", glewGetErrorString(errorCode), errorCode); 
    } 
} 

繼承人的全局變量我使用

GLuint vertex_buffer; 
GLuint index_buffer; 
GLuint normal_buffer; 
GLuint texture_buffer; 
GLuint vertex_array_object; 

輸出glxinfo的（如果你需要它）

name of display: localhost:11.0 
display: localhost:11 screen: 0 
direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose) 
server glx vendor string: SGI 
server glx version string: 1.4 
server glx extensions: 
GLX_ARB_multisample, GLX_EXT_import_context, 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_pbuffer 
client glx vendor string: ATI 
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_swap_control, 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_NV_swap_group, 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_pbuffer, 
GLX_SGIX_swap_barrier, GLX_SGIX_swap_group, GLX_SGIX_visual_select_group, 
GLX_EXT_texture_from_pixmap, GLX_EXT_framebuffer_sRGB, 
GLX_ARB_fbconfig_float, GLX_AMD_gpu_association, GLX_EXT_buffer_age 
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_OML_swap_method, GLX_SGI_make_current_read, GLX_SGI_swap_control, 
GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer 
OpenGL vendor string: ATI Technologies Inc. 
OpenGL renderer string: AMD Radeon HD 7800 Series 
OpenGL version string: 1.4 (4.4.12967 Compatibility Profile Context 14.200.1004.0) 
OpenGL extensions: 
GL_ARB_depth_texture, GL_ARB_draw_buffers, GL_ARB_fragment_program, 
GL_ARB_fragment_program_shadow, GL_ARB_imaging, GL_ARB_multisample, 
GL_ARB_multitexture, GL_ARB_occlusion_query, GL_ARB_point_parameters, 
GL_ARB_point_sprite, 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_ARB_texture_mirrored_repeat, 
GL_ARB_texture_non_power_of_two, GL_ARB_texture_rectangle, 
GL_ARB_transpose_matrix, GL_ARB_vertex_buffer_object, 
GL_ARB_vertex_program, GL_ARB_window_pos, GL_ARB_shader_objects, 
GL_ARB_vertex_shader, GL_ARB_fragment_shader, GL_ARB_framebuffer_object, 
GL_ARB_geometry_shader4, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color, 
GL_EXT_blend_equation_separate, GL_EXT_blend_func_separate, 
GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_copy_texture, 
GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_object, 
GL_EXT_multi_draw_arrays, GL_EXT_packed_pixels, GL_EXT_point_parameters, 
GL_EXT_rescale_normal, GL_EXT_secondary_color, 
GL_EXT_separate_specular_color, GL_EXT_shadow_funcs, GL_EXT_stencil_wrap, 
GL_EXT_subtexture, GL_EXT_texture3D, GL_EXT_texture_compression_s3tc, 
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, 
GL_EXT_texture_lod_bias, GL_EXT_texture_mirror_clamp, 
GL_EXT_texture_object, GL_EXT_texture_rectangle, GL_EXT_vertex_array, 
GL_EXT_histogram, GL_EXT_framebuffer_blit, GL_EXT_framebuffer_multisample, 
GL_EXT_geometry_shader4, GL_EXT_gpu_shader4, GL_ATI_draw_buffers, 
GL_ATI_texture_env_combine3, GL_ATI_texture_float, 
GL_ATI_texture_mirror_once, GL_ATIX_texture_env_combine3, 
GL_IBM_texture_mirrored_repeat, GL_INGR_blend_func_separate, 
GL_SGIS_generate_mipmap, GL_SGIS_texture_border_clamp, 
GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod, GL_SGIX_shadow_ambient, 
GL_SUN_multi_draw_arrays, GL_ARB_texture_float 

哦，順便說一句，我使用的是靜態GLEW庫。

Answer 1

從你的問題來看，你不太清楚你正在使用哪個操作系統進行開發，但是基於gdb的用法，我會猜測你使用的是Linux。

當您獲得OpenGL 1.4兼容模式（可能是軟件渲染堆棧）時，您的視頻卡硬件支持OpenGL 4.2。這通常發生在未安裝視頻卡驅動程序的情況下（在Linux中，您可能使用開源驅動程序而不是供應商提供的閉源驅動程序），但如果您嘗試在遠程會話中運行OpenGL程序，也會發生這種情況。如果您嘗試這樣做，安裝VirtualGL可能會有所幫助（http://www.virtualgl.org/）。

Answer 2

您沒有正確處理GLEW未初始化的情況。打印完一條消息之後，您就可以繼續使用您的程序，該程序可能會在崩潰時運行。

但更糟糕的是：您不檢查您要使用的特定功能或擴展是否實際可用。 glGenBuffers實際上是OpenGL-1-5的函數，而你只能得到OpenGL-1.4上下文，至少這就是版本字符串所說的（這很奇怪，因爲顯然你的GPU可以做OpenGL-4）。 您必須在使用前檢查分機的可用性。毫無疑問，你不能使用超出OpenGL實現爲上下文提供的OpenGL版本配置文件的函數。 GL_ARB_vertex_buffer_object由OpenGL實現支持，但如果您想使用它，則必須使用glGenBuffersARB。

更新我認爲系統中的驅動程序未安裝正常運行。服務器字符串報告「供應商SGI」，與您的GPU驅動程序不匹配。