Attachment 20665 Details for Bug 18754 – glxinfo that queries the GLX_BIND_TO_MIPMAP_TEXTURE_EXT fbconfig attribute

glxinfo that queries the GLX_BIND_TO_MIPMAP_TEXTURE_EXT fbconfig attribute

glxinfo.c (text/plain), 38.15 KB, created by bob@o-hand.com on 2008-11-28 06:33:08 UTC

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Creator: bob@o-hand.com

Created: 2008-11-28 06:33:08 UTC

Size: 38.15 KB

patch

obsolete

>/*
> * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
> * 
> * Permission is hereby granted, free of charge, to any person obtaining a
> * copy of this software and associated documentation files (the "Software"),
> * to deal in the Software without restriction, including without limitation
> * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> * and/or sell copies of the Software, and to permit persons to whom the
> * Software is furnished to do so, subject to the following conditions:
> * 
> * The above copyright notice and this permission notice shall be included
> * in all copies or substantial portions of the Software.
> * 
> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
> * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
> * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
> * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
> */
>
>
>/*
> * This program is a work-alike of the IRIX glxinfo program.
> * Command line options:
> *  -t                     print wide table
> *  -v                     print verbose information
> *  -display DisplayName   specify the X display to interogate
> *  -b                     only print ID of "best" visual on screen 0
> *  -i                     use indirect rendering connection only
> *  -l                     print interesting OpenGL limits (added 5 Sep 2002)
> *
> * Brian Paul  26 January 2000
> */
>
>#define GLX_GLXEXT_PROTOTYPES
>
>#include <X11/Xlib.h>
>#include <X11/Xutil.h>
>#include <GL/gl.h>
>#include <GL/glx.h>
>#include <stdio.h>
>#include <string.h>
>#include <stdlib.h>
>
>
>#ifndef GLX_NONE_EXT
>#define GLX_NONE_EXT  0x8000
>#endif
>
>#ifndef GLX_TRANSPARENT_RGB
>#define GLX_TRANSPARENT_RGB 0x8008
>#endif
>
>#ifndef GLX_RGBA_BIT
>#define GLX_RGBA_BIT			0x00000001
>#endif
>
>#ifndef GLX_COLOR_INDEX_BIT
>#define GLX_COLOR_INDEX_BIT		0x00000002
>#endif
>
>typedef enum
>{
>   Normal,
>   Wide,
>   Verbose
>} InfoMode;
>
>
>struct visual_attribs
>{
>   /* X visual attribs */
>   int id;
>   int klass;
>   int depth;
>   int redMask, greenMask, blueMask;
>   int colormapSize;
>   int bitsPerRGB;
>
>   /* GL visual attribs */
>   int supportsGL;
>   int transparentType;
>   int transparentRedValue;
>   int transparentGreenValue;
>   int transparentBlueValue;
>   int transparentAlphaValue;
>   int transparentIndexValue;
>   int bufferSize;
>   int level;
>   int render_type;
>   int doubleBuffer;
>   int stereo;
>   int auxBuffers;
>   int redSize, greenSize, blueSize, alphaSize;
>   int depthSize;
>   int stencilSize;
>   int accumRedSize, accumGreenSize, accumBlueSize, accumAlphaSize;
>   int numSamples, numMultisample;
>   int visualCaveat;
>   int tfp_mipmap;
>};
>
>   
>/*
> * Print a list of extensions, with word-wrapping.
> */
>static void
>print_extension_list(const char *ext)
>{
>   const char *indentString = "    ";
>   const int indent = 4;
>   const int max = 79;
>   int width, i, j;
>
>   if (!ext || !ext[0])
>      return;
>
>   width = indent;
>   printf(indentString);
>   i = j = 0;
>   while (1) {
>      if (ext[j] == ' ' || ext[j] == 0) {
>         /* found end of an extension name */
>         const int len = j - i;
>         if (width + len > max) {
>            /* start a new line */
>            printf("\n");
>            width = indent;
>            printf(indentString);
>         }
>         /* print the extension name between ext[i] and ext[j] */
>         while (i < j) {
>            printf("%c", ext[i]);
>            i++;
>         }
>         /* either we're all done, or we'll continue with next extension */
>         width += len + 1;
>         if (ext[j] == 0) {
>            break;
>         }
>         else {
>            i++;
>            j++;
>            if (ext[j] == 0)
>               break;
>            printf(", ");
>            width += 2;
>         }
>      }
>      j++;
>   }
>   printf("\n");
>}
>
>
>static void
>print_display_info(Display *dpy)
>{
>   printf("name of display: %s\n", DisplayString(dpy));
>}
>
>
>/**
> * Print interesting limits for vertex/fragment programs.
> */
>static void
>print_program_limits(GLenum target)
>{
>#if defined(GL_ARB_vertex_program) || defined(GL_ARB_fragment_program)
>   struct token_name {
>      GLenum token;
>      const char *name;
>   };
>   static const struct token_name limits[] = {
>      { GL_MAX_PROGRAM_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_INSTRUCTIONS_ARB" },
>      { GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB" },
>      { GL_MAX_PROGRAM_TEMPORARIES_ARB, "GL_MAX_PROGRAM_TEMPORARIES_ARB" },
>      { GL_MAX_PROGRAM_NATIVE_TEMPORARIES_ARB, "GL_MAX_PROGRAM_NATIVE_TEMPORARIES_ARB" },
>      { GL_MAX_PROGRAM_PARAMETERS_ARB, "GL_MAX_PROGRAM_PARAMETERS_ARB" },
>      { GL_MAX_PROGRAM_NATIVE_PARAMETERS_ARB, "GL_MAX_PROGRAM_NATIVE_PARAMETERS_ARB" },
>      { GL_MAX_PROGRAM_ATTRIBS_ARB, "GL_MAX_PROGRAM_ATTRIBS_ARB" },
>      { GL_MAX_PROGRAM_NATIVE_ATTRIBS_ARB, "GL_MAX_PROGRAM_NATIVE_ATTRIBS_ARB" },
>      { GL_MAX_PROGRAM_ADDRESS_REGISTERS_ARB, "GL_MAX_PROGRAM_ADDRESS_REGISTERS_ARB" },
>      { GL_MAX_PROGRAM_NATIVE_ADDRESS_REGISTERS_ARB, "GL_MAX_PROGRAM_NATIVE_ADDRESS_REGISTERS_ARB" },
>      { GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB, "GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB" },
>      { GL_MAX_PROGRAM_ENV_PARAMETERS_ARB, "GL_MAX_PROGRAM_ENV_PARAMETERS_ARB" },
>      { GL_MAX_PROGRAM_ALU_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_ALU_INSTRUCTIONS_ARB" },
>      { GL_MAX_PROGRAM_TEX_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_TEX_INSTRUCTIONS_ARB" },
>      { GL_MAX_PROGRAM_TEX_INDIRECTIONS_ARB, "GL_MAX_PROGRAM_TEX_INDIRECTIONS_ARB" },
>      { GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB" },
>      { GL_MAX_PROGRAM_NATIVE_TEX_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_NATIVE_TEX_INSTRUCTIONS_ARB" },
>      { GL_MAX_PROGRAM_NATIVE_TEX_INDIRECTIONS_ARB, "GL_MAX_PROGRAM_NATIVE_TEX_INDIRECTIONS_ARB" },
>      { (GLenum) 0, NULL }
>   };
>   PFNGLGETPROGRAMIVARBPROC GetProgramivARB_func = (PFNGLGETPROGRAMIVARBPROC)
>      glXGetProcAddressARB((GLubyte *) "glGetProgramivARB");
>   GLint max[1];
>   int i;
>
>   if (target == GL_VERTEX_PROGRAM_ARB) {
>      printf("    GL_VERTEX_PROGRAM_ARB:\n");
>   }
>   else if (target == GL_FRAGMENT_PROGRAM_ARB) {
>      printf("    GL_FRAGMENT_PROGRAM_ARB:\n");
>   }
>   else {
>      return; /* something's wrong */
>   }
>
>   for (i = 0; limits[i].token; i++) {
>      GetProgramivARB_func(target, limits[i].token, max);
>      if (glGetError() == GL_NO_ERROR) {
>         printf("        %s = %d\n", limits[i].name, max[0]);
>      }
>   }
>#endif /* GL_ARB_vertex_program / GL_ARB_fragment_program */
>}
>
>
>/**
> * Print interesting limits for vertex/fragment shaders.
> */
>static void
>print_shader_limits(GLenum target)
>{
>   struct token_name {
>      GLenum token;
>      const char *name;
>   };
>#if defined(GL_ARB_vertex_shader)
>   static const struct token_name vertex_limits[] = {
>      { GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB, "GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB" },
>      { GL_MAX_VARYING_FLOATS_ARB, "GL_MAX_VARYING_FLOATS_ARB" },
>      { GL_MAX_VERTEX_ATTRIBS_ARB, "GL_MAX_VERTEX_ATTRIBS_ARB" },
>      { GL_MAX_TEXTURE_IMAGE_UNITS_ARB, "GL_MAX_TEXTURE_IMAGE_UNITS_ARB" },
>      { GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB, "GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB" },
>      { GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS_ARB, "GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS_ARB" },
>      { GL_MAX_TEXTURE_COORDS_ARB, "GL_MAX_TEXTURE_COORDS_ARB" },
>      { (GLenum) 0, NULL }
>   };
>#endif
>#if defined(GL_ARB_fragment_shader)
>   static const struct token_name fragment_limits[] = {
>      { GL_MAX_FRAGMENT_UNIFORM_COMPONENTS_ARB, "GL_MAX_FRAGMENT_UNIFORM_COMPONENTS_ARB" },
>      { GL_MAX_TEXTURE_COORDS_ARB, "GL_MAX_TEXTURE_COORDS_ARB" },
>      { GL_MAX_TEXTURE_IMAGE_UNITS_ARB, "GL_MAX_TEXTURE_IMAGE_UNITS_ARB" },
>      { (GLenum) 0, NULL }
>   };
>#endif
>   GLint max[1];
>   int i;
>
>#if defined(GL_ARB_vertex_shader)
>   if (target == GL_VERTEX_SHADER_ARB) {
>      printf("    GL_VERTEX_SHADER_ARB:\n");
>      for (i = 0; vertex_limits[i].token; i++) {
>         glGetIntegerv(vertex_limits[i].token, max);
>         if (glGetError() == GL_NO_ERROR) {
>            printf("        %s = %d\n", vertex_limits[i].name, max[0]);
>         }
>      }
>   }
>#endif
>#if defined(GL_ARB_fragment_shader)
>   if (target == GL_FRAGMENT_SHADER_ARB) {
>      printf("    GL_FRAGMENT_SHADER_ARB:\n");
>      for (i = 0; fragment_limits[i].token; i++) {
>         glGetIntegerv(fragment_limits[i].token, max);
>         if (glGetError() == GL_NO_ERROR) {
>            printf("        %s = %d\n", fragment_limits[i].name, max[0]);
>         }
>      }
>   }
>#endif
>}
>
>
>/**
> * Print interesting OpenGL implementation limits.
> */
>static void
>print_limits(const char *extensions)
>{
>   struct token_name {
>      GLuint count;
>      GLenum token;
>      const char *name;
>   };
>   static const struct token_name limits[] = {
>      { 1, GL_MAX_ATTRIB_STACK_DEPTH, "GL_MAX_ATTRIB_STACK_DEPTH" },
>      { 1, GL_MAX_CLIENT_ATTRIB_STACK_DEPTH, "GL_MAX_CLIENT_ATTRIB_STACK_DEPTH" },
>      { 1, GL_MAX_CLIP_PLANES, "GL_MAX_CLIP_PLANES" },
>      { 1, GL_MAX_COLOR_MATRIX_STACK_DEPTH, "GL_MAX_COLOR_MATRIX_STACK_DEPTH" },
>      { 1, GL_MAX_ELEMENTS_VERTICES, "GL_MAX_ELEMENTS_VERTICES" },
>      { 1, GL_MAX_ELEMENTS_INDICES, "GL_MAX_ELEMENTS_INDICES" },
>      { 1, GL_MAX_EVAL_ORDER, "GL_MAX_EVAL_ORDER" },
>      { 1, GL_MAX_LIGHTS, "GL_MAX_LIGHTS" },
>      { 1, GL_MAX_LIST_NESTING, "GL_MAX_LIST_NESTING" },
>      { 1, GL_MAX_MODELVIEW_STACK_DEPTH, "GL_MAX_MODELVIEW_STACK_DEPTH" },
>      { 1, GL_MAX_NAME_STACK_DEPTH, "GL_MAX_NAME_STACK_DEPTH" },
>      { 1, GL_MAX_PIXEL_MAP_TABLE, "GL_MAX_PIXEL_MAP_TABLE" },
>      { 1, GL_MAX_PROJECTION_STACK_DEPTH, "GL_MAX_PROJECTION_STACK_DEPTH" },
>      { 1, GL_MAX_TEXTURE_STACK_DEPTH, "GL_MAX_TEXTURE_STACK_DEPTH" },
>      { 1, GL_MAX_TEXTURE_SIZE, "GL_MAX_TEXTURE_SIZE" },
>      { 1, GL_MAX_3D_TEXTURE_SIZE, "GL_MAX_3D_TEXTURE_SIZE" },
>      { 2, GL_MAX_VIEWPORT_DIMS, "GL_MAX_VIEWPORT_DIMS" },
>      { 2, GL_ALIASED_LINE_WIDTH_RANGE, "GL_ALIASED_LINE_WIDTH_RANGE" },
>      { 2, GL_SMOOTH_LINE_WIDTH_RANGE, "GL_SMOOTH_LINE_WIDTH_RANGE" },
>      { 2, GL_ALIASED_POINT_SIZE_RANGE, "GL_ALIASED_POINT_SIZE_RANGE" },
>      { 2, GL_SMOOTH_POINT_SIZE_RANGE, "GL_SMOOTH_POINT_SIZE_RANGE" },
>#if defined(GL_ARB_texture_cube_map)
>      { 1, GL_MAX_CUBE_MAP_TEXTURE_SIZE_ARB, "GL_MAX_CUBE_MAP_TEXTURE_SIZE_ARB" },
>#endif
>#if defined(GLX_NV_texture_rectangle)
>      { 1, GL_MAX_RECTANGLE_TEXTURE_SIZE_NV, "GL_MAX_RECTANGLE_TEXTURE_SIZE_NV" },
>#endif
>#if defined(GL_ARB_texture_compression)
>      { 1, GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB, "GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB" },
>#endif
>#if defined(GL_ARB_multitexture)
>      { 1, GL_MAX_TEXTURE_UNITS_ARB, "GL_MAX_TEXTURE_UNITS_ARB" },
>#endif
>#if defined(GL_EXT_texture_lod_bias)
>      { 1, GL_MAX_TEXTURE_LOD_BIAS_EXT, "GL_MAX_TEXTURE_LOD_BIAS_EXT" },
>#endif
>#if defined(GL_EXT_texture_filter_anisotropic)
>      { 1, GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, "GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT" },
>#endif
>#if defined(GL_ARB_draw_buffers)
>      { 1, GL_MAX_DRAW_BUFFERS_ARB, "GL_MAX_DRAW_BUFFERS_ARB" },
>#endif
>      { 0, (GLenum) 0, NULL }
>   };
>   GLint i, max[2];
>
>   printf("OpenGL limits:\n");
>   for (i = 0; limits[i].count; i++) {
>      glGetIntegerv(limits[i].token, max);
>      if (glGetError() == GL_NO_ERROR) {
>         if (limits[i].count == 1)
>            printf("    %s = %d\n", limits[i].name, max[0]);
>         else /* XXX fix if we ever query something with more than 2 values */
>            printf("    %s = %d, %d\n", limits[i].name, max[0], max[1]);
>      }
>   }
>
>   /* these don't fit into the above mechanism, unfortunately */
>   glGetConvolutionParameteriv(GL_CONVOLUTION_2D, GL_MAX_CONVOLUTION_WIDTH, max);
>   glGetConvolutionParameteriv(GL_CONVOLUTION_2D, GL_MAX_CONVOLUTION_HEIGHT, max+1);
>   if (glGetError() == GL_NONE) {
>      printf("    GL_MAX_CONVOLUTION_WIDTH/HEIGHT = %d, %d\n", max[0], max[1]);
>   }
>
>#if defined(GL_ARB_vertex_program)
>   if (strstr(extensions, "GL_ARB_vertex_program")) {
>      print_program_limits(GL_VERTEX_PROGRAM_ARB);
>   }
>#endif
>#if defined(GL_ARB_fragment_program)
>   if (strstr(extensions, "GL_ARB_fragment_program")) {
>      print_program_limits(GL_FRAGMENT_PROGRAM_ARB);
>   }
>#endif
>#if defined(GL_ARB_vertex_shader)
>   if (strstr(extensions, "GL_ARB_vertex_shader")) {
>      print_shader_limits(GL_VERTEX_SHADER_ARB);
>   }
>#endif
>#if defined(GL_ARB_fragment_shader)
>   if (strstr(extensions, "GL_ARB_fragment_shader")) {
>      print_shader_limits(GL_FRAGMENT_SHADER_ARB);
>   }
>#endif
>}
>
>
>static void
>print_screen_info(Display *dpy, int scrnum, Bool allowDirect, GLboolean limits)
>{
>   Window win;
>   int attribSingle[] = {
>      GLX_RGBA,
>      GLX_RED_SIZE, 1,
>      GLX_GREEN_SIZE, 1,
>      GLX_BLUE_SIZE, 1,
>      None };
>   int attribDouble[] = {
>      GLX_RGBA,
>      GLX_RED_SIZE, 1,
>      GLX_GREEN_SIZE, 1,
>      GLX_BLUE_SIZE, 1,
>      GLX_DOUBLEBUFFER,
>      None };
>
>   XSetWindowAttributes attr;
>   unsigned long mask;
>   Window root;
>   GLXContext ctx = NULL;
>   XVisualInfo *visinfo;
>   int width = 100, height = 100;
>
>   root = RootWindow(dpy, scrnum);
>
>   visinfo = glXChooseVisual(dpy, scrnum, attribSingle);
>   if (!visinfo)
>      visinfo = glXChooseVisual(dpy, scrnum, attribDouble);
>
>   if (visinfo)
>      ctx = glXCreateContext( dpy, visinfo, NULL, allowDirect );
>
>#ifdef GLX_VERSION_1_3
>   {
>      int fbAttribSingle[] = {
>	 GLX_RENDER_TYPE,   GLX_RGBA_BIT,
>	 GLX_RED_SIZE,      1,
>	 GLX_GREEN_SIZE,    1,
>	 GLX_BLUE_SIZE,     1,
>	 GLX_DOUBLEBUFFER,  GL_TRUE,
>	 None };
>      int fbAttribDouble[] = {
>	 GLX_RENDER_TYPE,   GLX_RGBA_BIT,
>	 GLX_RED_SIZE,      1,
>	 GLX_GREEN_SIZE,    1,
>	 GLX_BLUE_SIZE,     1,
>	 None };
>      GLXFBConfig *configs = NULL;
>      int nConfigs;
>
>      if (!visinfo)
>	 configs = glXChooseFBConfig(dpy, scrnum, fbAttribSingle, &nConfigs);
>      if (!visinfo)
>	 configs = glXChooseFBConfig(dpy, scrnum, fbAttribDouble, &nConfigs);
>
>      if (configs) {
>	 visinfo = glXGetVisualFromFBConfig(dpy, configs[0]);
>	 ctx = glXCreateNewContext(dpy, configs[0], GLX_RGBA_TYPE, NULL, allowDirect);
>	 XFree(configs);
>      }
>   }
>#endif
>
>   if (!visinfo) {
>      fprintf(stderr, "Error: couldn't find RGB GLX visual or fbconfig\n");
>      return;
>   }
>
>   if (!ctx) {
>      fprintf(stderr, "Error: glXCreateContext failed\n");
>      XFree(visinfo);
>      return;
>   }
>
>   attr.background_pixel = 0;
>   attr.border_pixel = 0;
>   attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
>   attr.event_mask = StructureNotifyMask | ExposureMask;
>   mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
>   win = XCreateWindow(dpy, root, 0, 0, width, height,
>		       0, visinfo->depth, InputOutput,
>		       visinfo->visual, mask, &attr);
>
>   if (glXMakeCurrent(dpy, win, ctx)) {
>      const char *serverVendor = glXQueryServerString(dpy, scrnum, GLX_VENDOR);
>      const char *serverVersion = glXQueryServerString(dpy, scrnum, GLX_VERSION);
>      const char *serverExtensions = glXQueryServerString(dpy, scrnum, GLX_EXTENSIONS);
>      const char *clientVendor = glXGetClientString(dpy, GLX_VENDOR);
>      const char *clientVersion = glXGetClientString(dpy, GLX_VERSION);
>      const char *clientExtensions = glXGetClientString(dpy, GLX_EXTENSIONS);
>      const char *glxExtensions = glXQueryExtensionsString(dpy, scrnum);
>      const char *glVendor = (const char *) glGetString(GL_VENDOR);
>      const char *glRenderer = (const char *) glGetString(GL_RENDERER);
>      const char *glVersion = (const char *) glGetString(GL_VERSION);
>      const char *glExtensions = (const char *) glGetString(GL_EXTENSIONS);
>      int glxVersionMajor;
>      int glxVersionMinor;
>      char *displayName = NULL;
>      char *colon = NULL, *period = NULL;
>      
>      if (! glXQueryVersion( dpy, & glxVersionMajor, & glxVersionMinor )) {
>         fprintf(stderr, "Error: glXQueryVersion failed\n");
>         exit(1);
>      }
>
>      /* Strip the screen number from the display name, if present. */
>      if (!(displayName = (char *) malloc(strlen(DisplayString(dpy)) + 1))) {
>         fprintf(stderr, "Error: malloc() failed\n");
>         exit(1);
>      }
>      strcpy(displayName, DisplayString(dpy));
>      colon = strrchr(displayName, ':');
>      if (colon) {
>         period = strchr(colon, '.');
>         if (period)
>            *period = '\0';
>      }
>      printf("display: %s  screen: %d\n", displayName, scrnum);
>      free(displayName);
>      printf("direct rendering: ");
>      if (glXIsDirect(dpy, ctx)) {
>         printf("Yes\n");
>      } else {
>         if (!allowDirect) {
>            printf("No (-i specified)\n");
>         } else if (getenv("LIBGL_ALWAYS_INDIRECT")) {
>            printf("No (LIBGL_ALWAYS_INDIRECT set)\n");
>         } else {
>            printf("No (If you want to find out why, try setting "
>                   "LIBGL_DEBUG=verbose)\n");
>         }
>      }
>      printf("server glx vendor string: %s\n", serverVendor);
>      printf("server glx version string: %s\n", serverVersion);
>      printf("server glx extensions:\n");
>      print_extension_list(serverExtensions);
>      printf("client glx vendor string: %s\n", clientVendor);
>      printf("client glx version string: %s\n", clientVersion);
>      printf("client glx extensions:\n");
>      print_extension_list(clientExtensions);
>      printf("GLX version: %u.%u\n", glxVersionMajor, glxVersionMinor);
>      printf("GLX extensions:\n");
>      print_extension_list(glxExtensions);
>      printf("OpenGL vendor string: %s\n", glVendor);
>      printf("OpenGL renderer string: %s\n", glRenderer);
>      printf("OpenGL version string: %s\n", glVersion);
>#ifdef GL_VERSION_2_0
>      if (glVersion[0] >= '2' && glVersion[1] == '.') {
>         char *v = (char *) glGetString(GL_SHADING_LANGUAGE_VERSION);
>         printf("OpenGL shading language version string: %s\n", v);
>      }
>#endif
>
>      printf("OpenGL extensions:\n");
>      print_extension_list(glExtensions);
>      if (limits)
>         print_limits(glExtensions);
>   }
>   else {
>      fprintf(stderr, "Error: glXMakeCurrent failed\n");
>   }
>
>   glXDestroyContext(dpy, ctx);
>   XFree(visinfo);
>   XDestroyWindow(dpy, win);
>}
>
>
>static const char *
>visual_class_name(int cls)
>{
>   switch (cls) {
>      case StaticColor:
>         return "StaticColor";
>      case PseudoColor:
>         return "PseudoColor";
>      case StaticGray:
>         return "StaticGray";
>      case GrayScale:
>         return "GrayScale";
>      case TrueColor:
>         return "TrueColor";
>      case DirectColor:
>         return "DirectColor";
>      default:
>         return "";
>   }
>}
>
>
>static const char *
>visual_class_abbrev(int cls)
>{
>   switch (cls) {
>      case StaticColor:
>         return "sc";
>      case PseudoColor:
>         return "pc";
>      case StaticGray:
>         return "sg";
>      case GrayScale:
>         return "gs";
>      case TrueColor:
>         return "tc";
>      case DirectColor:
>         return "dc";
>      default:
>         return "";
>   }
>}
>
>static const char *
>visual_render_type_name(int type)
>{
>   switch (type) {
>      case GLX_RGBA_BIT:
>         return "rgba";
>      case GLX_COLOR_INDEX_BIT:
>         return "ci";
>      case GLX_RGBA_BIT | GLX_COLOR_INDEX_BIT:
>         return "rgba|ci";
>      default:
>         return "";
>      }
>}
>
>static GLboolean
>get_visual_attribs(Display *dpy, XVisualInfo *vInfo,
>                   struct visual_attribs *attribs)
>{
>   const char *ext = glXQueryExtensionsString(dpy, vInfo->screen);
>   int rgba;
>
>   memset(attribs, 0, sizeof(struct visual_attribs));
>
>   attribs->id = vInfo->visualid;
>#if defined(__cplusplus) || defined(c_plusplus)
>   attribs->klass = vInfo->c_class;
>#else
>   attribs->klass = vInfo->class;
>#endif
>   attribs->depth = vInfo->depth;
>   attribs->redMask = vInfo->red_mask;
>   attribs->greenMask = vInfo->green_mask;
>   attribs->blueMask = vInfo->blue_mask;
>   attribs->colormapSize = vInfo->colormap_size;
>   attribs->bitsPerRGB = vInfo->bits_per_rgb;
>
>   if (glXGetConfig(dpy, vInfo, GLX_USE_GL, &attribs->supportsGL) != 0 ||
>       !attribs->supportsGL)
>      return GL_FALSE;
>   glXGetConfig(dpy, vInfo, GLX_BUFFER_SIZE, &attribs->bufferSize);
>   glXGetConfig(dpy, vInfo, GLX_LEVEL, &attribs->level);
>   glXGetConfig(dpy, vInfo, GLX_RGBA, &rgba);
>   if (rgba)
>      attribs->render_type = GLX_RGBA_BIT;
>   else
>      attribs->render_type = GLX_COLOR_INDEX_BIT;
>   
>   glXGetConfig(dpy, vInfo, GLX_DOUBLEBUFFER, &attribs->doubleBuffer);
>   glXGetConfig(dpy, vInfo, GLX_STEREO, &attribs->stereo);
>   glXGetConfig(dpy, vInfo, GLX_AUX_BUFFERS, &attribs->auxBuffers);
>   glXGetConfig(dpy, vInfo, GLX_RED_SIZE, &attribs->redSize);
>   glXGetConfig(dpy, vInfo, GLX_GREEN_SIZE, &attribs->greenSize);
>   glXGetConfig(dpy, vInfo, GLX_BLUE_SIZE, &attribs->blueSize);
>   glXGetConfig(dpy, vInfo, GLX_ALPHA_SIZE, &attribs->alphaSize);
>   glXGetConfig(dpy, vInfo, GLX_DEPTH_SIZE, &attribs->depthSize);
>   glXGetConfig(dpy, vInfo, GLX_STENCIL_SIZE, &attribs->stencilSize);
>   glXGetConfig(dpy, vInfo, GLX_ACCUM_RED_SIZE, &attribs->accumRedSize);
>   glXGetConfig(dpy, vInfo, GLX_ACCUM_GREEN_SIZE, &attribs->accumGreenSize);
>   glXGetConfig(dpy, vInfo, GLX_ACCUM_BLUE_SIZE, &attribs->accumBlueSize);
>   glXGetConfig(dpy, vInfo, GLX_ACCUM_ALPHA_SIZE, &attribs->accumAlphaSize);
>
>   /* get transparent pixel stuff */
>   glXGetConfig(dpy, vInfo,GLX_TRANSPARENT_TYPE, &attribs->transparentType);
>   if (attribs->transparentType == GLX_TRANSPARENT_RGB) {
>     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_RED_VALUE, &attribs->transparentRedValue);
>     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_GREEN_VALUE, &attribs->transparentGreenValue);
>     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_BLUE_VALUE, &attribs->transparentBlueValue);
>     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_ALPHA_VALUE, &attribs->transparentAlphaValue);
>   }
>   else if (attribs->transparentType == GLX_TRANSPARENT_INDEX) {
>     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_INDEX_VALUE, &attribs->transparentIndexValue);
>   }
>
>   /* multisample attribs */
>#ifdef GLX_ARB_multisample
>   if (ext && strstr(ext, "GLX_ARB_multisample")) {
>      glXGetConfig(dpy, vInfo, GLX_SAMPLE_BUFFERS_ARB, &attribs->numMultisample);
>      glXGetConfig(dpy, vInfo, GLX_SAMPLES_ARB, &attribs->numSamples);
>   }
>#endif
>   else {
>      attribs->numSamples = 0;
>      attribs->numMultisample = 0;
>   }
>
>#if defined(GLX_EXT_visual_rating)
>   if (ext && strstr(ext, "GLX_EXT_visual_rating")) {
>      glXGetConfig(dpy, vInfo, GLX_VISUAL_CAVEAT_EXT, &attribs->visualCaveat);
>   }
>   else {
>      attribs->visualCaveat = GLX_NONE_EXT;
>   }
>#else
>   attribs->visualCaveat = 0;
>#endif
>   attribs->tfp_mipmap = 0;
>
>   return GL_TRUE;
>}
>
>#ifdef GLX_VERSION_1_3
>
>static int
>glx_token_to_visual_class(int visual_type)
>{
>   switch (visual_type) {
>   case GLX_TRUE_COLOR:
>      return TrueColor;
>   case GLX_DIRECT_COLOR:
>      return DirectColor;
>   case GLX_PSEUDO_COLOR:
>      return PseudoColor;
>   case GLX_STATIC_COLOR:
>      return StaticColor;
>   case GLX_GRAY_SCALE:
>      return GrayScale;
>   case GLX_STATIC_GRAY:
>      return StaticGray;
>   case GLX_NONE:
>   default:
>      return None;
>   }
>}
>
>static GLboolean
>get_fbconfig_attribs(Display *dpy, GLXFBConfig fbconfig,
>		     struct visual_attribs *attribs)
>{
>   int visual_type;
>   int ret;
>
>   memset(attribs, 0, sizeof(struct visual_attribs));
>
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_FBCONFIG_ID, &attribs->id);
>
>#if 0
>   attribs->depth = vInfo->depth;
>   attribs->redMask = vInfo->red_mask;
>   attribs->greenMask = vInfo->green_mask;
>   attribs->blueMask = vInfo->blue_mask;
>   attribs->colormapSize = vInfo->colormap_size;
>   attribs->bitsPerRGB = vInfo->bits_per_rgb;
>#endif
>
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_X_VISUAL_TYPE, &visual_type);
>   attribs->klass = glx_token_to_visual_class(visual_type);
>
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_BUFFER_SIZE, &attribs->bufferSize);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_LEVEL, &attribs->level);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_RENDER_TYPE, &attribs->render_type);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_DOUBLEBUFFER, &attribs->doubleBuffer);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_STEREO, &attribs->stereo);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_AUX_BUFFERS, &attribs->auxBuffers);
>
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_RED_SIZE, &attribs->redSize);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_GREEN_SIZE, &attribs->greenSize);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_BLUE_SIZE, &attribs->blueSize);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ALPHA_SIZE, &attribs->alphaSize);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_DEPTH_SIZE, &attribs->depthSize);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_STENCIL_SIZE, &attribs->stencilSize);
>
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ACCUM_RED_SIZE, &attribs->accumRedSize);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ACCUM_GREEN_SIZE, &attribs->accumGreenSize);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ACCUM_BLUE_SIZE, &attribs->accumBlueSize);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ACCUM_ALPHA_SIZE, &attribs->accumAlphaSize);
>
>   /* get transparent pixel stuff */
>   glXGetFBConfigAttrib(dpy, fbconfig,GLX_TRANSPARENT_TYPE, &attribs->transparentType);
>   if (attribs->transparentType == GLX_TRANSPARENT_RGB) {
>     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_RED_VALUE, &attribs->transparentRedValue);
>     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_GREEN_VALUE, &attribs->transparentGreenValue);
>     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_BLUE_VALUE, &attribs->transparentBlueValue);
>     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_ALPHA_VALUE, &attribs->transparentAlphaValue);
>   }
>   else if (attribs->transparentType == GLX_TRANSPARENT_INDEX) {
>     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_INDEX_VALUE, &attribs->transparentIndexValue);
>   }
>
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_SAMPLE_BUFFERS, &attribs->numMultisample);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_SAMPLES, &attribs->numSamples);
>   glXGetFBConfigAttrib(dpy, fbconfig, GLX_CONFIG_CAVEAT, &attribs->visualCaveat);
>   
>   ret = glXGetFBConfigAttrib(dpy, fbconfig, GLX_BIND_TO_MIPMAP_TEXTURE_EXT, &attribs->tfp_mipmap);
>   if (ret != Success) {
>      if (ret == GLX_BAD_ATTRIBUTE)
>         printf("DEBUG: GLX returned GLX_BAD_ATTRIBUTE, for GLX_BIND_TO_MIPMAP_TEXTURE_EXT\n");
>      else
>         printf("DEBUG: GLX error for GLX_BIND_TO_MIPMAP_TEXTURE_EXT %d\n", ret);
>   }
>
>   return GL_TRUE;
>}
>
>#endif
>
>
>
>static void
>print_visual_attribs_verbose(const struct visual_attribs *attribs, GLboolean is_fbconfig)
>{
>   printf("%s ID: %x  depth=%d  class=%s\n",
>          is_fbconfig ? "FBConfig" : "Visual",
>          attribs->id, attribs->depth, visual_class_name(attribs->klass));
>   printf("    bufferSize=%d level=%d renderType=%s doubleBuffer=%d stereo=%d\n",
>          attribs->bufferSize, attribs->level,
>	  visual_render_type_name(attribs->render_type),
>          attribs->doubleBuffer, attribs->stereo);
>   printf("    rgba: redSize=%d greenSize=%d blueSize=%d alphaSize=%d\n",
>          attribs->redSize, attribs->greenSize,
>          attribs->blueSize, attribs->alphaSize);
>   printf("    auxBuffers=%d depthSize=%d stencilSize=%d\n",
>          attribs->auxBuffers, attribs->depthSize, attribs->stencilSize);
>   printf("    accum: redSize=%d greenSize=%d blueSize=%d alphaSize=%d\n",
>          attribs->accumRedSize, attribs->accumGreenSize,
>          attribs->accumBlueSize, attribs->accumAlphaSize);
>   printf("    multiSample=%d  multiSampleBuffers=%d\n",
>          attribs->numSamples, attribs->numMultisample);
>#ifdef GLX_EXT_visual_rating
>   if (attribs->visualCaveat == GLX_NONE_EXT || attribs->visualCaveat == 0)
>      printf("    visualCaveat=None\n");
>   else if (attribs->visualCaveat == GLX_SLOW_VISUAL_EXT)
>      printf("    visualCaveat=Slow\n");
>   else if (attribs->visualCaveat == GLX_NON_CONFORMANT_VISUAL_EXT)
>      printf("    visualCaveat=Nonconformant\n");
>#endif
>   if (attribs->transparentType == GLX_NONE) {
>     printf("    Opaque.\n");
>   }
>   else if (attribs->transparentType == GLX_TRANSPARENT_RGB) {
>     printf("    Transparent RGB: Red=%d Green=%d Blue=%d Alpha=%d\n",attribs->transparentRedValue,attribs->transparentGreenValue,attribs->transparentBlueValue,attribs->transparentAlphaValue);
>   }
>   else if (attribs->transparentType == GLX_TRANSPARENT_INDEX) {
>     printf("    Transparent index=%d\n",attribs->transparentIndexValue);
>   }
>   if (is_fbconfig) {
>      if (attribs->tfp_mipmap)
>         printf("    TFP Mipmaps=Yes\n");
>      else
>         printf("    TFP Mipmaps=No\n");
>   }
>}
>
>
>static void
>print_visual_attribs_short_header(void)
>{
> printf("   visual  x  bf lv rg d st colorbuffer ax dp st accumbuffer  ms  tfp cav\n");
> printf(" id dep cl sp sz l  ci b ro  r  g  b  a bf th cl  r  g  b  a ns b mip eat\n");
> printf("-------------------------------------------------------------------------\n");
>}
>
>
>static void
>print_visual_attribs_short(const struct visual_attribs *attribs, GLboolean is_fbconfig)
>{
>   char *caveat = NULL;
>#ifdef GLX_EXT_visual_rating
>   if (attribs->visualCaveat == GLX_NONE_EXT || attribs->visualCaveat == 0)
>      caveat = "None";
>   else if (attribs->visualCaveat == GLX_SLOW_VISUAL_EXT)
>      caveat = "Slow";
>   else if (attribs->visualCaveat == GLX_NON_CONFORMANT_VISUAL_EXT)
>      caveat = "Ncon";
>   else
>      caveat = "None";
>#else
>   caveat = "None";
>#endif 
>
>   printf("0x%02x %2d %2s %2d %2d %2d %c%c %c  %c %2d %2d %2d %2d %2d %2d %2d",
>          attribs->id,
>          attribs->depth,
>          visual_class_abbrev(attribs->klass),
>          attribs->transparentType != GLX_NONE,
>          attribs->bufferSize,
>          attribs->level,
>          (attribs->render_type & GLX_RGBA_BIT) ? 'r' : ' ',
>          (attribs->render_type & GLX_COLOR_INDEX_BIT) ? 'c' : ' ',
>          attribs->doubleBuffer ? 'y' : '.',
>          attribs->stereo ? 'y' : '.',
>          attribs->redSize, attribs->greenSize,
>          attribs->blueSize, attribs->alphaSize,
>          attribs->auxBuffers,
>          attribs->depthSize,
>          attribs->stencilSize
>          );
>
>   printf(" %2d %2d %2d %2d %2d %1d",
>          attribs->accumRedSize, attribs->accumGreenSize,
>          attribs->accumBlueSize, attribs->accumAlphaSize,
>          attribs->numSamples, attribs->numMultisample
>          );
>
>   if(is_fbconfig) {
>      printf("  %1d", attribs->tfp_mipmap);
>   }
>
>   printf("  %s\n", caveat);
>}
>
>
>static void
>print_visual_attribs_long_header(void)
>{
> printf("Vis  Vis   Visual Trans  buff lev render DB ste  r   g   b   a  aux dep ste  accum buffers  MS   MS   tfp\n");
> printf(" ID Depth   Type  parent size el   type     reo sz  sz  sz  sz  buf th  ncl  r   g   b   a  num bufs mipmap\n");
> printf("-----------------------------------------------------------------------------------------------------------\n");
>}
>
>
>static void
>print_visual_attribs_long(const struct visual_attribs *attribs, GLboolean is_fbconfig)
>{
>   printf("0x%2x %2d %-11s %2d     %2d %2d  %4s %3d %3d %3d %3d %3d %3d",
>          attribs->id,
>          attribs->depth,
>          visual_class_name(attribs->klass),
>          attribs->transparentType != GLX_NONE,
>          attribs->bufferSize,
>          attribs->level,
>          visual_render_type_name(attribs->render_type),
>          attribs->doubleBuffer,
>          attribs->stereo,
>          attribs->redSize, attribs->greenSize,
>          attribs->blueSize, attribs->alphaSize
>          );
>
>   printf(" %3d %4d %2d %3d %3d %3d %3d  %2d  %2d",
>          attribs->auxBuffers,
>          attribs->depthSize,
>          attribs->stencilSize,
>          attribs->accumRedSize, attribs->accumGreenSize,
>          attribs->accumBlueSize, attribs->accumAlphaSize,
>          attribs->numSamples, attribs->numMultisample
>          );
>
>   if(is_fbconfig)
>      printf("    %2d", attribs->tfp_mipmap);
>
>   printf("\n");
>}
>
>
>static void
>print_visual_info(Display *dpy, int scrnum, InfoMode mode)
>{
>   XVisualInfo theTemplate;
>   XVisualInfo *visuals;
>   int numVisuals, numGlxVisuals;
>   long mask;
>   int i;
>   struct visual_attribs attribs;
>
>   /* get list of all visuals on this screen */
>   theTemplate.screen = scrnum;
>   mask = VisualScreenMask;
>   visuals = XGetVisualInfo(dpy, mask, &theTemplate, &numVisuals);
>
>   numGlxVisuals = 0;
>   for (i = 0; i < numVisuals; i++) {
>      if (get_visual_attribs(dpy, &visuals[i], &attribs))
>	 numGlxVisuals++;
>   }
>
>   if (numGlxVisuals == 0)
>      return;
>
>   printf("%d GLX Visuals\n", numGlxVisuals);
>
>   if (mode == Normal)
>      print_visual_attribs_short_header();
>   else if (mode == Wide)
>      print_visual_attribs_long_header();
>
>   for (i = 0; i < numVisuals; i++) {
>      if (!get_visual_attribs(dpy, &visuals[i], &attribs))
>	 continue;
>
>      if (mode == Verbose)
>	 print_visual_attribs_verbose(&attribs, GL_FALSE);
>      else if (mode == Normal)
>         print_visual_attribs_short(&attribs, GL_FALSE);
>      else if (mode == Wide) 
>         print_visual_attribs_long(&attribs, GL_FALSE);
>   }
>   printf("\n");
>
>   XFree(visuals);
>}
>
>#ifdef GLX_VERSION_1_3
>
>static void
>print_fbconfig_info(Display *dpy, int scrnum, InfoMode mode)
>{
>   int numFBConfigs;
>   struct visual_attribs attribs;
>   GLXFBConfig *fbconfigs;
>   int i;
>
>   /* get list of all fbconfigs on this screen */
>   fbconfigs = glXGetFBConfigs(dpy, scrnum, &numFBConfigs);
>
>   if (numFBConfigs == 0)
>      return;
>
>   printf("%d GLXFBConfigs:\n", numFBConfigs);
>   if (mode == Normal)
>      print_visual_attribs_short_header();
>   else if (mode == Wide)
>      print_visual_attribs_long_header();
>
>   for (i = 0; i < numFBConfigs; i++) {
>      get_fbconfig_attribs(dpy, fbconfigs[i], &attribs);
>
>      if (mode == Verbose) 
>         print_visual_attribs_verbose(&attribs, GL_TRUE);
>      else if (mode == Normal)
>	 print_visual_attribs_short(&attribs, GL_TRUE);
>      else if (mode == Wide)
>         print_visual_attribs_long(&attribs, GL_TRUE);
>   }
>   printf("\n");
>
>   XFree(fbconfigs);
>}
>
>#endif
>
>/*
> * Stand-alone Mesa doesn't really implement the GLX protocol so it
> * doesn't really know the GLX attributes associated with an X visual.
> * The first time a visual is presented to Mesa's pseudo-GLX it
> * attaches ancilliary buffers to it (like depth and stencil).
> * But that usually only works if glXChooseVisual is used.
> * This function calls glXChooseVisual() to sort of "prime the pump"
> * for Mesa's GLX so that the visuals that get reported actually
> * reflect what applications will see.
> * This has no effect when using true GLX.
> */
>static void
>mesa_hack(Display *dpy, int scrnum)
>{
>   static int attribs[] = {
>      GLX_RGBA,
>      GLX_RED_SIZE, 1,
>      GLX_GREEN_SIZE, 1,
>      GLX_BLUE_SIZE, 1,
>      GLX_DEPTH_SIZE, 1,
>      GLX_STENCIL_SIZE, 1,
>      GLX_ACCUM_RED_SIZE, 1,
>      GLX_ACCUM_GREEN_SIZE, 1,
>      GLX_ACCUM_BLUE_SIZE, 1,
>      GLX_ACCUM_ALPHA_SIZE, 1,
>      GLX_DOUBLEBUFFER,
>      None
>   };
>   XVisualInfo *visinfo;
>
>   visinfo = glXChooseVisual(dpy, scrnum, attribs);
>   if (visinfo)
>      XFree(visinfo);
>}
>
>
>/*
> * Examine all visuals to find the so-called best one.
> * We prefer deepest RGBA buffer with depth, stencil and accum
> * that has no caveats.
> */
>static int
>find_best_visual(Display *dpy, int scrnum)
>{
>   XVisualInfo theTemplate;
>   XVisualInfo *visuals;
>   int numVisuals;
>   long mask;
>   int i;
>   struct visual_attribs bestVis;
>
>   /* get list of all visuals on this screen */
>   theTemplate.screen = scrnum;
>   mask = VisualScreenMask;
>   visuals = XGetVisualInfo(dpy, mask, &theTemplate, &numVisuals);
>
>   /* init bestVis with first visual info */
>   get_visual_attribs(dpy, &visuals[0], &bestVis);
>
>   /* try to find a "better" visual */
>   for (i = 1; i < numVisuals; i++) {
>      struct visual_attribs vis;
>
>      get_visual_attribs(dpy, &visuals[i], &vis);
>
>      /* always skip visuals with caveats */
>      if (vis.visualCaveat != GLX_NONE_EXT)
>         continue;
>
>      /* see if this vis is better than bestVis */
>      if ((!bestVis.supportsGL && vis.supportsGL) ||
>          (bestVis.visualCaveat != GLX_NONE_EXT) ||
>          (!(bestVis.render_type & GLX_RGBA_BIT) && (vis.render_type & GLX_RGBA_BIT)) ||
>          (!bestVis.doubleBuffer && vis.doubleBuffer) ||
>          (bestVis.redSize < vis.redSize) ||
>          (bestVis.greenSize < vis.greenSize) ||
>          (bestVis.blueSize < vis.blueSize) ||
>          (bestVis.alphaSize < vis.alphaSize) ||
>          (bestVis.depthSize < vis.depthSize) ||
>          (bestVis.stencilSize < vis.stencilSize) ||
>          (bestVis.accumRedSize < vis.accumRedSize)) {
>         /* found a better visual */
>         bestVis = vis;
>      }
>   }
>
>   XFree(visuals);
>
>   return bestVis.id;
>}
>
>
>static void
>usage(void)
>{
>   printf("Usage: glxinfo [-v] [-t] [-h] [-i] [-b] [-display <dname>]\n");
>   printf("\t-v: Print visuals info in verbose form.\n");
>   printf("\t-t: Print verbose table.\n");
>   printf("\t-display <dname>: Print GLX visuals on specified server.\n");
>   printf("\t-h: This information.\n");
>   printf("\t-i: Force an indirect rendering context.\n");
>   printf("\t-b: Find the 'best' visual and print it's number.\n");
>   printf("\t-l: Print interesting OpenGL limits.\n");
>}
>
>
>int
>main(int argc, char *argv[])
>{
>   char *displayName = NULL;
>   Display *dpy;
>   int numScreens, scrnum;
>   InfoMode mode = Normal;
>   GLboolean findBest = GL_FALSE;
>   GLboolean limits = GL_FALSE;
>   Bool allowDirect = True;
>   int i;
>
>   for (i = 1; i < argc; i++) {
>      if (strcmp(argv[i], "-display") == 0 && i + 1 < argc) {
>         displayName = argv[i + 1];
>         i++;
>      }
>      else if (strcmp(argv[i], "-t") == 0) {
>         mode = Wide;
>      }
>      else if (strcmp(argv[i], "-v") == 0) {
>         mode = Verbose;
>      }
>      else if (strcmp(argv[i], "-b") == 0) {
>         findBest = GL_TRUE;
>      }
>      else if (strcmp(argv[i], "-i") == 0) {
>         allowDirect = False;
>      }
>      else if (strcmp(argv[i], "-l") == 0) {
>         limits = GL_TRUE;
>      }
>      else if (strcmp(argv[i], "-h") == 0) {
>         usage();
>         return 0;
>      }
>      else {
>         printf("Unknown option `%s'\n", argv[i]);
>         usage();
>         return 0;
>      }
>   }
>
>   dpy = XOpenDisplay(displayName);
>   if (!dpy) {
>      fprintf(stderr, "Error: unable to open display %s\n", XDisplayName(displayName));
>      return -1;
>   }
>
>   if (findBest) {
>      int b;
>      mesa_hack(dpy, 0);
>      b = find_best_visual(dpy, 0);
>      printf("%d\n", b);
>   }
>   else {
>      numScreens = ScreenCount(dpy);
>      print_display_info(dpy);
>      for (scrnum = 0; scrnum < numScreens; scrnum++) {
>         mesa_hack(dpy, scrnum);
>         print_screen_info(dpy, scrnum, allowDirect, limits);
>         printf("\n");
>         print_visual_info(dpy, scrnum, mode);
>#ifdef GLX_VERSION_1_3
>         print_fbconfig_info(dpy, scrnum, mode);
>#endif
>         if (scrnum + 1 < numScreens)
>            printf("\n\n");
>      }
>   }
>
>   XCloseDisplay(dpy);
>
>   return 0;
>}

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Attachments on bug 18754: 20665

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