1 files changed, 395 insertions, 0 deletions

diff --git a/src/glut/glx/glut_cmap.c b/src/glut/glx/glut_cmap.c
new file mode 100644
index 0000000000..a9d004003f
--- /dev/null
+++ b/src/glut/glx/glut_cmap.c
@@ -0,0 +1,395 @@
+
+/* Copyright (c) Mark J. Kilgard, 1994, 1996, 1997.  */
+
+/* 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 <string.h>
+#include <stdio.h>  /* SunOS multithreaded assert() needs <stdio.h>.  Lame. */
+#include <assert.h>
+#if !defined(_WIN32)
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xatom.h>  /* for XA_RGB_DEFAULT_MAP atom */
+#if defined(__vms)
+#include <Xmu/StdCmap.h>  /* for XmuLookupStandardColormap */
+#else
+#include <X11/Xmu/StdCmap.h>  /* for XmuLookupStandardColormap */
+#endif
+#endif
+
+/* SGI optimization introduced in IRIX 6.3 to avoid X server
+   round trips for interning common X atoms. */
+#if defined(_SGI_EXTRA_PREDEFINES) && !defined(NO_FAST_ATOMS)
+#include <X11/SGIFastAtom.h>
+#else
+#define XSGIFastInternAtom(dpy,string,fast_name,how) XInternAtom(dpy,string,how)
+#endif
+
+#include "glutint.h"
+#include "layerutil.h"
+
+GLUTcolormap *__glutColormapList = NULL;
+
+GLUTcolormap *
+__glutAssociateNewColormap(XVisualInfo * vis)
+{
+  GLUTcolormap *cmap;
+  int transparentPixel, i;
+  unsigned long pixels[255];
+
+  cmap = (GLUTcolormap *) malloc(sizeof(GLUTcolormap));
+  if (!cmap)
+    __glutFatalError("out of memory.");
+#if defined(_WIN32)
+  pixels[0] = 0;        /* avoid compilation warnings on win32 */
+  cmap->visual = 0;
+  cmap->size = 256;     /* always assume 256 on Win32 */
+#else
+  cmap->visual = vis->visual;
+  cmap->size = vis->visual->map_entries;
+#endif
+  cmap->refcnt = 1;
+  cmap->cells = (GLUTcolorcell *)
+    malloc(sizeof(GLUTcolorcell) * cmap->size);
+  if (!cmap->cells)
+    __glutFatalError("out of memory.");
+  /* make all color cell entries be invalid */
+  for (i = cmap->size - 1; i >= 0; i--) {
+    cmap->cells[i].component[GLUT_RED] = -1.0;
+    cmap->cells[i].component[GLUT_GREEN] = -1.0;
+    cmap->cells[i].component[GLUT_BLUE] = -1.0;
+  }
+  transparentPixel = __glutGetTransparentPixel(__glutDisplay, vis);
+  if (transparentPixel == -1 || transparentPixel >= cmap->size) {
+
+    /* If there is no transparent pixel or if the transparent
+       pixel is outside the range of valid colormap cells (HP
+       can implement their overlays this smart way since their
+       transparent pixel is 255), we can AllocAll the colormap.
+       See note below.  */
+
+    cmap->cmap = XCreateColormap(__glutDisplay,
+      __glutRoot, cmap->visual, AllocAll);
+  } else {
+
+    /* On machines where zero (or some other value in the range
+       of 0 through map_entries-1), BadAlloc may be generated
+       when an AllocAll overlay colormap is allocated since the
+       transparent pixel precludes all the cells in the colormap
+       being allocated (the transparent pixel is pre-allocated).
+       So in this case, use XAllocColorCells to allocate
+       map_entries-1 pixels (that is, all but the transparent
+       pixel.  */
+
+#if defined(_WIN32)
+    cmap->cmap = XCreateColormap(__glutDisplay,
+      __glutRoot, 0, AllocNone);
+#else
+    cmap->cmap = XCreateColormap(__glutDisplay,
+      __glutRoot, vis->visual, AllocNone);
+    XAllocColorCells(__glutDisplay, cmap->cmap, False, 0, 0,
+      pixels, cmap->size - 1);
+#endif
+  }
+  cmap->next = __glutColormapList;
+  __glutColormapList = cmap;
+  return cmap;
+}
+
+static GLUTcolormap *
+associateColormap(XVisualInfo * vis)
+{
+#if !defined(_WIN32)
+  GLUTcolormap *cmap = __glutColormapList;
+
+  while (cmap != NULL) {
+    /* Play safe: compare visual IDs, not Visual*'s. */
+    if (cmap->visual->visualid == vis->visual->visualid) {
+      /* Already have created colormap for the visual. */
+      cmap->refcnt++;
+      return cmap;
+    }
+    cmap = cmap->next;
+  }
+#endif
+  return __glutAssociateNewColormap(vis);
+}
+
+void
+__glutSetupColormap(XVisualInfo * vi, GLUTcolormap ** colormap, Colormap * cmap)
+{
+#if defined(_WIN32)
+  if (vi->dwFlags & PFD_NEED_PALETTE || vi->iPixelType == PFD_TYPE_COLORINDEX) {
+    *colormap = associateColormap(vi);
+    *cmap = (*colormap)->cmap;
+  } else {
+    *colormap = NULL;
+    *cmap = 0;
+  }
+#else
+  Status status;
+  XStandardColormap *standardCmaps;
+  int i, numCmaps;
+  static Atom hpColorRecoveryAtom = -1;
+  int isRGB, visualClass, rc;
+
+#if defined(__cplusplus) || defined(c_plusplus)
+  visualClass = vi->c_class;
+#else
+  visualClass = vi->class;
+#endif
+  switch (visualClass) {
+  case PseudoColor:
+    /* Mesa might return a PseudoColor visual for RGB mode. */
+    rc = glXGetConfig(__glutDisplay, vi, GLX_RGBA, &isRGB);
+    if (rc == 0 && isRGB) {
+      /* Must be Mesa. */
+      *colormap = NULL;
+      if (MaxCmapsOfScreen(DefaultScreenOfDisplay(__glutDisplay)) == 1
+        && vi->visual == DefaultVisual(__glutDisplay, __glutScreen)) {
+        char *privateCmap = getenv("MESA_PRIVATE_CMAP");
+
+        if (privateCmap) {
+          /* User doesn't want to share colormaps. */
+          *cmap = XCreateColormap(__glutDisplay, __glutRoot,
+            vi->visual, AllocNone);
+        } else {
+          /* Share the root colormap. */
+          *cmap = DefaultColormap(__glutDisplay, __glutScreen);
+        }
+      } else {
+        /* Get our own PseudoColor colormap. */
+        *cmap = XCreateColormap(__glutDisplay, __glutRoot,
+          vi->visual, AllocNone);
+      }
+    } else {
+      /* CI mode, real GLX never returns a PseudoColor visual
+         for RGB mode. */
+      *colormap = associateColormap(vi);
+      *cmap = (*colormap)->cmap;
+    }
+    break;
+  case TrueColor:
+  case DirectColor:
+    *colormap = NULL;   /* NULL if RGBA */
+
+    /* Hewlett-Packard supports a feature called "HP Color
+       Recovery". Mesa has code to use HP Color Recovery.  For
+       Mesa to use this feature, the atom
+       _HP_RGB_SMOOTH_MAP_LIST must be defined on the root
+       window AND the colormap obtainable by XGetRGBColormaps
+       for that atom must be set on the window.  If that
+       colormap is not set, the output will look stripy. */
+
+    if (hpColorRecoveryAtom == -1) {
+      char *xvendor;
+
+#define VENDOR_HP "Hewlett-Packard"
+
+      /* Only makes sense to make XInternAtom round-trip if we
+         know that we are connected to an HP X server. */
+      xvendor = ServerVendor(__glutDisplay);
+      if (!strncmp(xvendor, VENDOR_HP, sizeof(VENDOR_HP) - 1)) {
+        hpColorRecoveryAtom = XInternAtom(__glutDisplay, "_HP_RGB_SMOOTH_MAP_LIST", True);
+      } else {
+        hpColorRecoveryAtom = None;
+      }
+    }
+    if (hpColorRecoveryAtom != None) {
+      status = XGetRGBColormaps(__glutDisplay, __glutRoot,
+        &standardCmaps, &numCmaps, hpColorRecoveryAtom);
+      if (status == 1) {
+        for (i = 0; i < numCmaps; i++) {
+          if (standardCmaps[i].visualid == vi->visualid) {
+            *cmap = standardCmaps[i].colormap;
+            XFree(standardCmaps);
+            return;
+          }
+        }
+        XFree(standardCmaps);
+      }
+    }
+#ifndef SOLARIS_2_4_BUG
+    /* Solaris 2.4 and 2.5 have a bug in their
+       XmuLookupStandardColormap implementations.  Please
+       compile your Solaris 2.4 or 2.5 version of GLUT with
+       -DSOLARIS_2_4_BUG to work around this bug. The symptom
+       of the bug is that programs will get a BadMatch error
+       from X_CreateWindow when creating a GLUT window because
+       Solaris 2.4 and 2.5 create a  corrupted RGB_DEFAULT_MAP
+       property.  Note that this workaround prevents Colormap
+       sharing between applications, perhaps leading
+       unnecessary colormap installations or colormap flashing.
+       Sun fixed this bug in Solaris 2.6. */
+    status = XmuLookupStandardColormap(__glutDisplay,
+      vi->screen, vi->visualid, vi->depth, XA_RGB_DEFAULT_MAP,
+      /* replace */ False, /* retain */ True);
+    if (status == 1) {
+      status = XGetRGBColormaps(__glutDisplay, __glutRoot,
+        &standardCmaps, &numCmaps, XA_RGB_DEFAULT_MAP);
+      if (status == 1) {
+        for (i = 0; i < numCmaps; i++) {
+          if (standardCmaps[i].visualid == vi->visualid) {
+            *cmap = standardCmaps[i].colormap;
+            XFree(standardCmaps);
+            return;
+          }
+        }
+        XFree(standardCmaps);
+      }
+    }
+#endif
+    /* If no standard colormap but TrueColor, just make a
+       private one. */
+    /* XXX Should do a better job of internal sharing for
+       privately allocated TrueColor colormaps. */
+    /* XXX DirectColor probably needs ramps hand initialized! */
+    *cmap = XCreateColormap(__glutDisplay, __glutRoot,
+      vi->visual, AllocNone);
+    break;
+  case StaticColor:
+  case StaticGray:
+  case GrayScale:
+    /* Mesa supports these visuals */
+    *colormap = NULL;
+    *cmap = XCreateColormap(__glutDisplay, __glutRoot,
+      vi->visual, AllocNone);
+    break;
+  default:
+    __glutFatalError(
+      "could not allocate colormap for visual type: %d.",
+      visualClass);
+  }
+  return;
+#endif
+}
+
+#if !defined(_WIN32)
+static int
+findColormaps(GLUTwindow * window,
+  Window * winlist, Colormap * cmaplist, int num, int max)
+{
+  GLUTwindow *child;
+  int i;
+
+  /* Do not allow more entries that maximum number of
+     colormaps! */
+  if (num >= max)
+    return num;
+  /* Is cmap for this window already on the list? */
+  for (i = 0; i < num; i++) {
+    if (cmaplist[i] == window->cmap)
+      goto normalColormapAlreadyListed;
+  }
+  /* Not found on the list; add colormap and window. */
+  winlist[num] = window->win;
+  cmaplist[num] = window->cmap;
+  num++;
+
+normalColormapAlreadyListed:
+
+  /* Repeat above but for the overlay colormap if there one. */
+  if (window->overlay) {
+    if (num >= max)
+      return num;
+    for (i = 0; i < num; i++) {
+      if (cmaplist[i] == window->overlay->cmap)
+        goto overlayColormapAlreadyListed;
+    }
+    winlist[num] = window->overlay->win;
+    cmaplist[num] = window->overlay->cmap;
+    num++;
+  }
+overlayColormapAlreadyListed:
+
+  /* Recursively search children. */
+  child = window->children;
+  while (child) {
+    num = findColormaps(child, winlist, cmaplist, num, max);
+    child = child->siblings;
+  }
+  return num;
+}
+
+void
+__glutEstablishColormapsProperty(GLUTwindow * window)
+{
+  /* this routine is strictly X.  Win32 doesn't need to do
+     anything of this sort (but has to do other wacky stuff
+     later). */
+  static Atom wmColormapWindows = None;
+  Window *winlist;
+  Colormap *cmaplist;
+  Status status;
+  int maxcmaps, num;
+
+  assert(!window->parent);
+  maxcmaps = MaxCmapsOfScreen(ScreenOfDisplay(__glutDisplay,
+      __glutScreen));
+  /* For portability reasons we don't use alloca for winlist
+     and cmaplist, but we could. */
+  winlist = (Window *) malloc(maxcmaps * sizeof(Window));
+  cmaplist = (Colormap *) malloc(maxcmaps * sizeof(Colormap));
+  num = findColormaps(window, winlist, cmaplist, 0, maxcmaps);
+  if (num < 2) {
+    /* Property no longer needed; remove it. */
+    wmColormapWindows = XSGIFastInternAtom(__glutDisplay,
+      "WM_COLORMAP_WINDOWS", SGI_XA_WM_COLORMAP_WINDOWS, False);
+    if (wmColormapWindows == None) {
+      __glutWarning("Could not intern X atom for WM_COLORMAP_WINDOWS.");
+      return;
+    }
+    XDeleteProperty(__glutDisplay, window->win, wmColormapWindows);
+  } else {
+    status = XSetWMColormapWindows(__glutDisplay, window->win,
+      winlist, num);
+    /* XSetWMColormapWindows should always work unless the
+       WM_COLORMAP_WINDOWS property cannot be intern'ed.  We
+       check to be safe. */
+    if (status == False)
+      __glutFatalError("XSetWMColormapWindows returned False.");
+  }
+  /* For portability reasons we don't use alloca for winlist
+     and cmaplist, but we could. */
+  free(winlist);
+  free(cmaplist);
+}
+
+GLUTwindow *
+__glutToplevelOf(GLUTwindow * window)
+{
+  while (window->parent) {
+    window = window->parent;
+  }
+  return window;
+}
+#endif
+
+void
+__glutFreeColormap(GLUTcolormap * cmap)
+{
+  GLUTcolormap *cur, **prev;
+
+  cmap->refcnt--;
+  if (cmap->refcnt == 0) {
+    /* remove from colormap list */
+    cur = __glutColormapList;
+    prev = &__glutColormapList;
+    while (cur) {
+      if (cur == cmap) {
+        *prev = cmap->next;
+        break;
+      }
+      prev = &(cur->next);
+      cur = cur->next;
+    }
+    /* actually free colormap */
+    XFreeColormap(__glutDisplay, cmap->cmap);
+    free(cmap->cells);
+    free(cmap);
+  }
+}
+