Description of problem:
I want to draw a line, but it displays nothing.

Version-Release number of selected component (if applicable):
Name        : SDL2
Version     : 2.0.0
Release     : 3.fc19
Architecture: x86_64
Install Date: Sat 28 Sep 2013 05:42:57 PM CST
Group       : System Environment/Libraries
Size        : 912449
License     : zlib and MIT
Signature   : RSA/SHA256, Sat 24 Aug 2013 11:47:14 PM CST, Key ID 07477e65fb4b18e6
Source RPM  : SDL2-2.0.0-3.fc19.src.rpm
Build Date  : Sat 24 Aug 2013 05:32:24 PM CST
Build Host  : buildvm-22.phx2.fedoraproject.org
Relocations : (not relocatable)
Packager    : Fedora Project
Vendor      : Fedora Project
URL         : http://www.libsdl.org/
Summary     : A cross-platform multimedia library

How reproducible:
Compile my code, then run it 


Steps to Reproduce:
1. please save the following code to test.cpp
----------------------------------------------
#include <iostream>
#include <SDL.h>
#include <stdio.h>
#include <stdexcept>

class SDL {
public:
  SDL(Uint32 flags = 0);
  virtual ~SDL();
};

SDL::SDL(Uint32 flags) {
  if (SDL_Init(flags) != 0)
    throw std::runtime_error(SDL_GetError());
}

SDL::~SDL() {
  SDL_Quit();
}

int main(){
  //SDL_SetHint(SDL_HINT_RENDER_DRIVER,"software");
  SDL_LogSetAllPriority(SDL_LOG_PRIORITY_INFO);
  SDL sdl(SDL_INIT_EVERYTHING);

  //create window
  SDL_Window *win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN);
  if(!win){
    std::cout << "SDL_CreateWindow Error: " << SDL_GetError() << std::endl;
    return -1;
  }
  printf("debug %d\n",(int)__LINE__);  
  //create render
  SDL_Renderer *ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
  //SDL_Renderer *ren = SDL_CreateRenderer(win, -1, 0);
  if (!ren){
    std::cout << "SDL_CreateRenderer Error: " << SDL_GetError() << std::endl;
    return 1;
  }
  printf("debug %d\n",(int)__LINE__);  

  //clear the render
  SDL_SetRenderDrawColor(ren, 255, 255, 0, 255);
  SDL_RenderClear(ren);
  //render our texture to render
  SDL_SetRenderDrawColor(ren, 0xFF, 0xFF, 0xFF, 0xFF);
  int ret=SDL_RenderDrawLine(ren,0,0,500,500);
  if(ret){
    std::cout << "SDL_CreateTextureFromSurface Error: " << SDL_GetError() << std::endl;
    return -1;
  }
  //update the screen
  SDL_RenderPresent(ren);

  SDL_Delay(4000);
  
  SDL_DestroyRenderer(ren);
  SDL_DestroyWindow(win);
  return 0;
}
------------------------------------------------------------------
2. compile the code
 Before compile, you need SDL2-devel and g++ installed.
 g++ -Wall -Wextra -D_REENTRANT -I/usr/include/SDL2 test.cpp -o t -lSDL2 -lpthread  

3. run it
./t


Actual results:
Yes, no lines.
And the debug output told us:
------------------------------------
debug 32
ERROR: glxSwapIntervalMESA failed
INFO: OpenGL shaders: ENABLED
INFO: Created renderer: opengl
debug 40
------------------------------------


Expected results:
There should be a line inside the window.

Additional info:
If we change the render driver from opengl to software (add this line to the beginning of main function) 
SDL_SetHint(SDL_HINT_RENDER_DRIVER,"software");

All things are right.

So, this is a problem of SDL2's opengl driver.

Test Env: 
vmware workstation 9.0.1 build-894247 (Host OS: windows 7 x86_64)
# glxinfo
name of display: :0.0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_multisample, GLX_EXT_create_context_es2_profile, 
    GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, 
    GLX_EXT_visual_rating, GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer, 
    GLX_OML_swap_method, GLX_SGIS_multisample, GLX_SGIX_fbconfig, 
    GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group
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_create_context_robustness, GLX_ARB_fbconfig_float, 
    GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample, 
    GLX_EXT_create_context_es2_profile, GLX_EXT_fbconfig_packed_float, 
    GLX_EXT_framebuffer_sRGB, GLX_EXT_import_context, 
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating, 
    GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer, 
    GLX_MESA_multithread_makecurrent, GLX_MESA_swap_control, 
    GLX_OML_swap_method, GLX_OML_sync_control, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
    GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGI_video_sync
GLX version: 1.4
GLX extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_get_proc_address, GLX_ARB_multisample, 
    GLX_EXT_create_context_es2_profile, GLX_EXT_import_context, 
    GLX_EXT_texture_from_pixmap, 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_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
    GLX_SGI_make_current_read, GLX_SGI_video_sync
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on SVGA3D; build: RELEASE;  
OpenGL version string: 2.1 Mesa 9.2.0
OpenGL shading language version string: 1.20
OpenGL extensions:
    GL_APPLE_packed_pixels, GL_APPLE_vertex_array_object, 
    GL_ARB_ES2_compatibility, GL_ARB_color_buffer_float, GL_ARB_copy_buffer, 
    GL_ARB_debug_output, GL_ARB_depth_texture, GL_ARB_draw_buffers, 
    GL_ARB_draw_elements_base_vertex, GL_ARB_explicit_attrib_location, 
    GL_ARB_fragment_coord_conventions, GL_ARB_fragment_program, 
    GL_ARB_fragment_program_shadow, GL_ARB_fragment_shader, 
    GL_ARB_framebuffer_object, GL_ARB_framebuffer_sRGB, 
    GL_ARB_get_program_binary, GL_ARB_half_float_pixel, 
    GL_ARB_half_float_vertex, GL_ARB_internalformat_query, 
    GL_ARB_invalidate_subdata, GL_ARB_map_buffer_range, GL_ARB_multisample, 
    GL_ARB_multitexture, GL_ARB_occlusion_query, GL_ARB_occlusion_query2, 
    GL_ARB_pixel_buffer_object, GL_ARB_point_parameters, GL_ARB_point_sprite, 
    GL_ARB_provoking_vertex, GL_ARB_robustness, GL_ARB_sampler_objects, 
    GL_ARB_shader_objects, GL_ARB_shading_language_100, GL_ARB_shadow, 
    GL_ARB_sync, 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_float, 
    GL_ARB_texture_mirrored_repeat, GL_ARB_texture_non_power_of_two, 
    GL_ARB_texture_rectangle, GL_ARB_texture_storage, GL_ARB_texture_swizzle, 
    GL_ARB_transpose_matrix, GL_ARB_vertex_array_bgra, 
    GL_ARB_vertex_array_object, GL_ARB_vertex_buffer_object, 
    GL_ARB_vertex_program, GL_ARB_vertex_shader, GL_ARB_window_pos, 
    GL_ATI_blend_equation_separate, GL_ATI_draw_buffers, 
    GL_ATI_separate_stencil, GL_ATI_texture_env_combine3, 
    GL_ATI_texture_float, 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_compiled_vertex_array, 
    GL_EXT_copy_texture, GL_EXT_draw_range_elements, GL_EXT_fog_coord, 
    GL_EXT_framebuffer_blit, GL_EXT_framebuffer_object, 
    GL_EXT_framebuffer_sRGB, GL_EXT_gpu_program_parameters, 
    GL_EXT_multi_draw_arrays, GL_EXT_packed_depth_stencil, 
    GL_EXT_packed_pixels, GL_EXT_pixel_buffer_object, GL_EXT_point_parameters, 
    GL_EXT_polygon_offset, GL_EXT_provoking_vertex, 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_cube_map, 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_object, GL_EXT_texture_rectangle, 
    GL_EXT_texture_sRGB, GL_EXT_texture_sRGB_decode, GL_EXT_texture_swizzle, 
    GL_EXT_vertex_array, GL_EXT_vertex_array_bgra, 
    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_window_pos, GL_NV_blend_square, 
    GL_NV_fog_distance, GL_NV_light_max_exponent, GL_NV_packed_depth_stencil, 
    GL_NV_primitive_restart, GL_NV_texgen_reflection, 
    GL_NV_texture_env_combine4, GL_NV_texture_rectangle, GL_OES_EGL_image, 
    GL_OES_read_format, GL_SGIS_generate_mipmap, GL_SGIS_texture_border_clamp, 
    GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod, GL_SUN_multi_draw_arrays