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最近、LinuxでMSAA（マルチサンプルアンチエイリアシング）を使用してみました。結果は驚くべきものでした。Nvidia独自のドライバーではすべてが魅力のように機能しましたが、nouveauドライバーでは機能しません。これについての奇妙なことは、glxingoがGLX_ARB_multisampleがサポートされていると言っており、GLX_SAMPLE_BUFFERSを1に設定し、GLX_SAMPLESを4（または8）に設定して適切なFBConfigを取得できることです。ただし、レンダリングに関しては、アンチエイリアシングが適用されていないため、画像はそのままです。問題は私のプロジェクトとfreeglutの両方に存在するので、問題を実証する小さなglutベースのプログラムを提供します。

/*
 * 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;
}

glxinfoの出力は次のとおりです（ビジュアル情報を除く）。

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は拡張機能が利用可能であることを示し、glGetIntegervはFBConfigの取得時に指定されたサンプル数が4であることを示します。何が起こっているのかわかりません。

編集：ここではglXQueryExtensionsStringの出力は次のとおりです。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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1 に答える 1

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MSAAについて忘れてください。nouveauでは、非常に新鮮なMESA+カーネル+X.orgがない限り。

MSAAは、OpenGL3.0以降の要件です。そのため、最近まで優先リストの上位にはありませんでした。そのためにはMesa9.0が必要です。

（これらの必要なソフトウェアを入手するためのヒントが必要な場合は、ハードウェアとソフトウェア（ディストリビューション、カーネル、メサ、xorg）のバージョンを投稿してください）。

于 2012-11-14T20:10:05.743 に答える