1 files changed, 147 insertions, 0 deletions
diff --git a/examples/opengl/overlay_x11/utilities/glxvisuals/glxvisuals.c b/examples/opengl/overlay_x11/utilities/glxvisuals/glxvisuals.c
new file mode 100644
index 000000000..3c1a21e68
--- /dev/null
+++ b/examples/opengl/overlay_x11/utilities/glxvisuals/glxvisuals.c
@@ -0,0 +1,147 @@
+
+/* Copyright (c) Mark J. Kilgard, 1996. */
+
+/* This program is freely distributable without licensing fees 
+   and is provided without guarantee or warrantee expressed or 
+   implied. This program is -not- in the public domain. */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <X11/Xlib.h>
+#include <GL/glx.h>
+
+static char *ClassOf(int c);
+static char *Format(int n, int w);
+
+void
+main(int argc, char *argv[])
+{
+  Display *dpy;
+  XVisualInfo match, *visualList, *vi, *visualToTry;
+  int errorBase, eventBase, major, minor, found;
+  int glxCapable, bufferSize, level, renderType, doubleBuffer, stereo,
+    auxBuffers, redSize, greenSize, blueSize, alphaSize, depthSize,
+    stencilSize, acRedSize, acGreenSize, acBlueSize, acAlphaSize;
+
+  dpy = XOpenDisplay(NULL);
+  if (!dpy) {
+    fprintf(stderr, "Could not connect to %s.\n", XDisplayName(NULL));
+    exit(1);
+  }
+  if (glXQueryExtension(dpy, &errorBase, &eventBase) == False) {
+    fprintf(stderr, "OpenGL not supported by X server.\n");
+    exit(1);
+  }
+
+  glXQueryVersion(dpy, &major, &minor);
+  printf("display: %s\n", XDisplayName(NULL));
+  printf("using GLX version: %d.%d\n\n", major, minor);
+
+  match.screen = DefaultScreen(dpy);
+  visualList = XGetVisualInfo(dpy, VisualScreenMask, &match, &found);
+
+  printf("   visual     bf lv rg d st  r  g  b a   ax dp st accum buffs\n");
+  printf(" id dep cl    sz l  ci b ro sz sz sz sz  bf th cl  r  g  b  a\n");
+  printf("-------------------------------------------------------------\n");
+
+  visualToTry = NULL;
+  for(vi = visualList; found > 0; found--, vi++) {
+    glXGetConfig(dpy, vi, GLX_USE_GL, &glxCapable);
+    if (glxCapable) {
+      printf("0x%x %2d %s", vi->visualid, vi->depth, ClassOf(vi->class));
+      glXGetConfig(dpy, vi, GLX_BUFFER_SIZE, &bufferSize);
+      glXGetConfig(dpy, vi, GLX_LEVEL, &level);
+      glXGetConfig(dpy, vi, GLX_RGBA, &renderType);
+      glXGetConfig(dpy, vi, GLX_DOUBLEBUFFER, &doubleBuffer);
+      glXGetConfig(dpy, vi, GLX_STEREO, &stereo);
+      glXGetConfig(dpy, vi, GLX_AUX_BUFFERS, &auxBuffers);
+      glXGetConfig(dpy, vi, GLX_RED_SIZE, &redSize);
+      glXGetConfig(dpy, vi, GLX_GREEN_SIZE, &greenSize);
+      glXGetConfig(dpy, vi, GLX_BLUE_SIZE, &blueSize);
+      glXGetConfig(dpy, vi, GLX_ALPHA_SIZE, &alphaSize);
+      glXGetConfig(dpy, vi, GLX_DEPTH_SIZE, &depthSize);
+      glXGetConfig(dpy, vi, GLX_STENCIL_SIZE, &stencilSize);
+      glXGetConfig(dpy, vi, GLX_ACCUM_RED_SIZE, &acRedSize);
+      glXGetConfig(dpy, vi, GLX_ACCUM_GREEN_SIZE, &acGreenSize);
+      glXGetConfig(dpy, vi, GLX_ACCUM_BLUE_SIZE, &acBlueSize);
+      glXGetConfig(dpy, vi, GLX_ACCUM_ALPHA_SIZE, &acAlphaSize);
+      printf("    %2s %2s %1s  %1s  %1s ",
+        Format(bufferSize, 2), Format(level, 2),
+        renderType ? "r" : "c",
+	doubleBuffer ? "y" : ".", 
+	stereo ? "y" : ".");
+      printf("%2s %2s %2s %2s ",
+        Format(redSize, 2), Format(greenSize, 2),
+	Format(blueSize, 2), Format(alphaSize, 2));
+      printf("%2s %2s %2s %2s %2s %2s %2s",
+        Format(auxBuffers, 2), Format(depthSize, 2), Format(stencilSize, 2),
+        Format(acRedSize, 2), Format(acGreenSize, 2),
+        Format(acBlueSize, 2), Format(acAlphaSize, 2));
+      printf("\n");
+      visualToTry = vi;
+    }
+  }
+
+  if (visualToTry) {
+    GLXContext context;
+    Window window;
+    Colormap colormap;
+    XSetWindowAttributes swa;
+
+    context = glXCreateContext(dpy, visualToTry, 0, GL_TRUE);
+    colormap = XCreateColormap(dpy,
+      RootWindow(dpy, visualToTry->screen),
+      visualToTry->visual, AllocNone);
+    swa.colormap = colormap;
+    swa.border_pixel = 0;
+    window = XCreateWindow(dpy, RootWindow(dpy, visualToTry->screen), 0, 0, 100, 100,
+      0, visualToTry->depth, InputOutput, visualToTry->visual,
+      CWBorderPixel | CWColormap, &swa);
+    glXMakeCurrent(dpy, window, context);
+    printf("\n");
+    printf("OpenGL vendor string: %s\n", glGetString(GL_VENDOR));
+    printf("OpenGL renderer string: %s\n", glGetString(GL_RENDERER));
+    printf("OpenGL version string: %s\n", glGetString(GL_VERSION));
+    if (glXIsDirect(dpy, context))
+      printf("direct rendering: supported\n");
+    printf( "GL extensions: '%s'\n\n", glGetString(GL_EXTENSIONS) );
+#if defined(GLX_VERSION_1_1)
+    printf( "GLX extensions: '%s'\n\n", glXQueryExtensionsString( dpy, visualToTry->screen ) );
+#endif
+
+  } else
+    printf("No GLX-capable visuals!\n");
+  XFree(visualList);
+}
+
+static char *
+ClassOf(int c)
+{
+  switch (c) {
+  case StaticGray:   return "sg";
+  case GrayScale:    return "gs";
+  case StaticColor:  return "sc";
+  case PseudoColor:  return "pc";
+  case TrueColor:    return "tc";
+  case DirectColor:  return "dc";
+  default:           return "??";
+  }
+}
+
+static char *
+Format(int n, int w)
+{
+  static char buffer[256];
+  static int bufptr;
+  char *buf;
+
+  if (bufptr >= sizeof(buffer) - w)
+    bufptr = 0;
+  buf = buffer + bufptr;
+  if (n == 0)
+    sprintf(buf, "%*s", w, ".");
+  else
+    sprintf(buf, "%*d", w, n);
+  bufptr += w + 1;
+  return buf;
+}