使用nouveau驱动程序openGL MSAA不能在Linux上工作

最近我尝试在Linux下使用MSAA（多重采样抗锯齿）。 结果令人惊讶：一切都像Nvidia专有驱动程序的魅力一样，然而使用nouveau驱动程序却无法正常工作。 奇怪的是，glxingo说支持GLX_ARB_multisample，我能够得到GLX_SAMPLE_BUFFERS设置为1，GLX_SAMPLES设置为4（或8）的合适的FBConfig。 但是在渲染方面，图片没有采用抗锯齿。 我的项目和Freeglut都存在这个问题，所以我将提供一个小型的基于过剩的程序来说明问题：

/* * Test multisampling and polygon smoothing. * * Brian Paul * 4 November 2002 */ #include <stdio.h> #include <stdlib.h> #include <math.h> #include <GL/glut.h> static GLfloat Zrot = 0; static GLboolean Anim = GL_TRUE; static GLboolean HaveMultisample = GL_TRUE; static GLboolean DoMultisample = GL_TRUE; static void PrintString(const char *s) { while (*s) { glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s); s++; } } static void Polygon( GLint verts, GLfloat radius, GLfloat z ) { int i; for (i = 0; i < verts; i++) { float a = (i * 2.0 * 3.14159) / verts; float x = radius * cos(a); float y = radius * sin(a); glVertex3f(x, y, z); } } static void DrawObject( void ) { glLineWidth(3.0); glColor3f(1, 1, 1); glBegin(GL_LINE_LOOP); Polygon(12, 1.2, 0); glEnd(); glLineWidth(1.0); glColor3f(1, 1, 1); glBegin(GL_LINE_LOOP); Polygon(12, 1.1, 0); glEnd(); glColor3f(1, 0, 0); glBegin(GL_POLYGON); Polygon(12, 0.4, 0.3); glEnd(); glColor3f(0, 1, 0); glBegin(GL_POLYGON); Polygon(12, 0.6, 0.2); glEnd(); glColor3f(0, 0, 1); glBegin(GL_POLYGON); Polygon(12, 0.8, 0.1); glEnd(); glColor3f(1, 1, 1); glBegin(GL_POLYGON); Polygon(12, 1.0, 0); glEnd(); } static void Display( void ) { glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glColor3f(1, 1, 1); if (HaveMultisample) { glRasterPos2f(-3.1, -1.6); if (DoMultisample) PrintString("MULTISAMPLE"); else PrintString("MULTISAMPLE (off)"); } glRasterPos2f(-0.8, -1.6); PrintString("No antialiasing"); glRasterPos2f(1.6, -1.6); PrintString("GL_POLYGON_SMOOTH"); /* multisample */ if (HaveMultisample) { glEnable(GL_DEPTH_TEST); if (DoMultisample) glEnable(GL_MULTISAMPLE_ARB); glPushMatrix(); glTranslatef(-2.5, 0, 0); glPushMatrix(); glRotatef(Zrot, 0, 0, 1); DrawObject(); glPopMatrix(); glPopMatrix(); glDisable(GL_MULTISAMPLE_ARB); glDisable(GL_DEPTH_TEST); } /* non-aa */ glEnable(GL_DEPTH_TEST); glPushMatrix(); glTranslatef(0, 0, 0); glPushMatrix(); glRotatef(Zrot, 0, 0, 1); DrawObject(); glPopMatrix(); glPopMatrix(); glDisable(GL_DEPTH_TEST); /* polygon smooth */ glEnable(GL_POLYGON_SMOOTH); glEnable(GL_LINE_SMOOTH); glEnable(GL_BLEND); glPushMatrix(); glTranslatef(2.5, 0, 0); glPushMatrix(); glRotatef(Zrot, 0, 0, 1); DrawObject(); glPopMatrix(); glPopMatrix(); glDisable(GL_LINE_SMOOTH); glDisable(GL_POLYGON_SMOOTH); glDisable(GL_BLEND); glutSwapBuffers(); } static void Reshape( int width, int height ) { GLfloat ar = (float) width / (float) height; glViewport( 0, 0, width, height ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); glOrtho(-2.0*ar, 2.0*ar, -2.0, 2.0, -1.0, 1.0); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); } static void Idle( void ) { Zrot = 0.01 * glutGet(GLUT_ELAPSED_TIME); glutPostRedisplay(); } static void Key( unsigned char key, int x, int y ) { const GLfloat step = 1.0; (void) x; (void) y; switch (key) { case 'a': Anim = !Anim; if (Anim) glutIdleFunc(Idle); else glutIdleFunc(NULL); break; case 'm': DoMultisample = !DoMultisample; break; case 'z': Zrot = (int) (Zrot - step); break; case 'Z': Zrot = (int) (Zrot + step); break; case 27: exit(0); break; } glutPostRedisplay(); } static void Init( void ) { /* GLUT imposes the four samples/pixel requirement */ int s; glGetIntegerv(GL_SAMPLES_ARB, &s); if (!glutExtensionSupported("GL_ARB_multisample") || s < 1) { printf("Warning: multisample antialiasing not supported.\n"); HaveMultisample = GL_FALSE; } printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); printf("GL_SAMPLES_ARB = %d\n", s); glBlendFunc(GL_SRC_ALPHA, GL_ONE); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glBlendFunc(GL_SRC_ALPHA_SATURATE, GL_ONE); glGetIntegerv(GL_MULTISAMPLE_ARB, &s); printf("GL_MULTISAMPLE_ARB = %d\n", s); } int main( int argc, char *argv[] ) { glutInit( &argc, argv ); glutInitWindowPosition( 0, 0 ); glutInitWindowSize( 600, 300 ); glutInitDisplayMode( GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE | GLUT_DEPTH | GLUT_MULTISAMPLE ); glutCreateWindow(argv[0]); glutReshapeFunc( Reshape ); glutKeyboardFunc( Key ); glutDisplayFunc( Display ); if (Anim) glutIdleFunc( Idle ); Init(); glutMainLoop(); return 0; } 

这里是glxinfo输出（不包括视觉信息）：

 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_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: nouveau OpenGL renderer string: Gallium 0.4 on NVC1 OpenGL version string: 2.1 Mesa 8.0.4 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_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_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_EXT_stencil_two_side, GL_EXT_texture_cube_map, GL_NV_depth_clamp, GL_NV_fog_distance, 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_EXT_shadow_funcs, GL_EXT_stencil_wrap, GL_MESA_pack_invert, GL_NV_primitive_restart, GL_ARB_depth_clamp, GL_ARB_fragment_program_shadow, GL_ARB_half_float_pixel, GL_ARB_occlusion_query2, 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_rectangle, GL_ATI_texture_compression_3dc, GL_EXT_packed_float, GL_EXT_pixel_buffer_object, GL_EXT_texture_compression_rgtc, GL_EXT_texture_mirror_clamp, 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_ARB_vertex_array_object, GL_ATI_separate_stencil, GL_ATI_texture_mirror_once, GL_EXT_draw_buffers2, GL_EXT_draw_instanced, GL_EXT_gpu_program_parameters, GL_EXT_texture_array, GL_EXT_texture_compression_latc, 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_draw_instanced, GL_ARB_half_float_vertex, GL_ARB_instanced_arrays, 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_AMD_conservative_depth, GL_AMD_draw_buffers_blend, GL_ARB_ES2_compatibility, GL_ARB_draw_buffers_blend, 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_NV_texture_barrier, GL_ARB_robustness, GL_ARB_transform_feedback2, GL_ARB_conservative_depth, GL_ARB_texture_storage, GL_EXT_transform_feedback 

glewIsSupported说扩展是可用的，glGetIntegerv表示样本的数量是4，得到FBConfig时指定。 我不知道发生了什么事。

编辑：这是glXQueryExtensionsString的输出：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

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