Import Mesa 6.5.1 (MesaLib, MesaDemos, MesaGLUT).

1 files changed, 956 insertions, 0 deletions

diff --git a/progs/xdemos/glxinfo.c b/progs/xdemos/glxinfo.c
new file mode 100644
index 00000000000..fdd1c0523f6
--- /dev/null
+++ b/progs/xdemos/glxinfo.c
@@ -0,0 +1,956 @@
+/*
+ * 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
+
+
+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 rgba;
+   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;
+};
+
+   
+/*
+ * 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;
+   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) {
+         fprintf(stderr, "Error: couldn't find RGB GLX visual\n");
+         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);
+
+   ctx = glXCreateContext( dpy, visinfo, NULL, allowDirect );
+   if (!ctx) {
+      fprintf(stderr, "Error: glXCreateContext failed\n");
+      XFree(visinfo);
+      XDestroyWindow(dpy, win);
+      return;
+   }
+
+   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: %s\n", glXIsDirect(dpy, ctx) ? "Yes" : "No");
+      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);
+      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 void
+get_visual_attribs(Display *dpy, XVisualInfo *vInfo,
+                   struct visual_attribs *attribs)
+{
+   const char *ext = glXQueryExtensionsString(dpy, vInfo->screen);
+
+   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)
+      return;
+   glXGetConfig(dpy, vInfo, GLX_BUFFER_SIZE, &attribs->bufferSize);
+   glXGetConfig(dpy, vInfo, GLX_LEVEL, &attribs->level);
+   glXGetConfig(dpy, vInfo, GLX_RGBA, &attribs->rgba);
+   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") == 0) {
+      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
+}
+
+
+static void
+print_visual_attribs_verbose(const struct visual_attribs *attribs)
+{
+   printf("Visual ID: %x  depth=%d  class=%s\n",
+          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, attribs->rgba ? "rgba" : "ci",
+          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);
+   }
+}
+
+
+static void
+print_visual_attribs_short_header(void)
+{
+ printf("   visual  x  bf lv rg d st colorbuffer ax dp st accumbuffer  ms  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 eat\n");
+ printf("----------------------------------------------------------------------\n");
+}
+
+
+static void
+print_visual_attribs_short(const struct visual_attribs *attribs)
+{
+   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%2x %2d %2s %2d %2d %2d %1s %2s %2s %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->rgba ? "r" : "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 %s\n",
+          attribs->accumRedSize, attribs->accumGreenSize,
+          attribs->accumBlueSize, attribs->accumAlphaSize,
+          attribs->numSamples, attribs->numMultisample,
+          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\n");
+ printf(" ID Depth   Type  parent size el   type     reo sz  sz  sz  sz  buf th  ncl  r   g   b   a  num bufs\n");
+ printf("----------------------------------------------------------------------------------------------------\n");
+}
+
+
+static void
+print_visual_attribs_long(const struct visual_attribs *attribs)
+{
+   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,
+          attribs->rgba ? "rgba" : "ci  ",
+          attribs->doubleBuffer,
+          attribs->stereo,
+          attribs->redSize, attribs->greenSize,
+          attribs->blueSize, attribs->alphaSize
+          );
+
+   printf(" %3d %4d %2d %3d %3d %3d %3d  %2d  %2d\n",
+          attribs->auxBuffers,
+          attribs->depthSize,
+          attribs->stencilSize,
+          attribs->accumRedSize, attribs->accumGreenSize,
+          attribs->accumBlueSize, attribs->accumAlphaSize,
+          attribs->numSamples, attribs->numMultisample
+          );
+}
+
+
+static void
+print_visual_info(Display *dpy, int scrnum, InfoMode mode)
+{
+   XVisualInfo theTemplate;
+   XVisualInfo *visuals;
+   int numVisuals;
+   long mask;
+   int i;
+
+   /* get list of all visuals on this screen */
+   theTemplate.screen = scrnum;
+   mask = VisualScreenMask;
+   visuals = XGetVisualInfo(dpy, mask, &theTemplate, &numVisuals);
+
+   if (mode == Verbose) {
+      for (i = 0; i < numVisuals; i++) {
+         struct visual_attribs attribs;
+         get_visual_attribs(dpy, &visuals[i], &attribs);
+         print_visual_attribs_verbose(&attribs);
+      }
+   }
+   else if (mode == Normal) {
+      print_visual_attribs_short_header();
+      for (i = 0; i < numVisuals; i++) {
+         struct visual_attribs attribs;
+         get_visual_attribs(dpy, &visuals[i], &attribs);
+         print_visual_attribs_short(&attribs);
+      }
+   }
+   else if (mode == Wide) {
+      print_visual_attribs_long_header();
+      for (i = 0; i < numVisuals; i++) {
+         struct visual_attribs attribs;
+         get_visual_attribs(dpy, &visuals[i], &attribs);
+         print_visual_attribs_long(&attribs);
+      }
+   }
+
+   XFree(visuals);
+}
+
+
+/*
+ * 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.rgba && vis.rgba) ||
+          (!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", 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);
+         if (scrnum + 1 < numScreens)
+            printf("\n\n");
+      }
+   }
+
+   XCloseDisplay(dpy);
+
+   return 0;
+}