glut_win.c

mesa-6.5-minigui源码

/* Copyright (c) Mark J. Kilgard, 1994, 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. */

#ifdef __VMS
#include <GL/vms_x_fix.h>
#endif

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#if !defined(_WIN32)
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#endif

#include "glutint.h"

GLUTwindow *__glutCurrentWindow = NULL;
GLUTwindow **__glutWindowList = NULL;
int __glutWindowListSize = 0;
#if !defined(_WIN32)
GLUTstale *__glutStaleWindowList = NULL;
#endif
GLUTwindow *__glutMenuWindow = NULL;

void (*__glutFreeOverlayFunc) (GLUToverlay *);
XVisualInfo *(*__glutDetermineVisualFromString) (char *string, Bool * treatAsSingle,
  Criterion * requiredCriteria, int nRequired, int requiredMask, void **fbc) = NULL;

static Criterion requiredWindowCriteria[] =
{
  {LEVEL, EQ, 0},
  {TRANSPARENT, EQ, 0}
};
static int numRequiredWindowCriteria = sizeof(requiredWindowCriteria) / sizeof(Criterion);
static int requiredWindowCriteriaMask = (1 << LEVEL) | (1 << TRANSPARENT);

static void
cleanWindowWorkList(GLUTwindow * window)
{
  GLUTwindow **pEntry = &__glutWindowWorkList;
  GLUTwindow *entry = __glutWindowWorkList;

  /* Tranverse singly-linked window work list look for the
     window. */
  while (entry) {
    if (entry == window) {
      /* Found it; delete it. */
      *pEntry = entry->prevWorkWin;
      return;
    } else {
      pEntry = &entry->prevWorkWin;
      entry = *pEntry;
    }
  }
}

#if !defined(_WIN32)

static void
cleanStaleWindowList(GLUTwindow * window)
{
  GLUTstale **pEntry = &__glutStaleWindowList;
  GLUTstale *entry = __glutStaleWindowList;

  /* Tranverse singly-linked stale window list look for the
     window ID. */
  while (entry) {
    if (entry->window == window) {
      /* Found it; delete it. */
      *pEntry = entry->next;
      free(entry);
      return;
    } else {
      pEntry = &entry->next;
      entry = *pEntry;
    }
  }
}

#endif

static GLUTwindow *__glutWindowCache = NULL;

GLUTwindow *
__glutGetWindow(Window win)
{
  int i;

  /* Does win belong to the last window ID looked up? */
  if (__glutWindowCache && (win == __glutWindowCache->win ||
      (__glutWindowCache->overlay && win ==
        __glutWindowCache->overlay->win))) {
    return
      __glutWindowCache;
  }
  /* Otherwise scan the window list looking for the window ID. */
  for (i = 0; i < __glutWindowListSize; i++) {
    if (__glutWindowList[i]) {
      if (win == __glutWindowList[i]->win) {
        __glutWindowCache = __glutWindowList[i];
        return __glutWindowCache;
      }
      if (__glutWindowList[i]->overlay) {
        if (win == __glutWindowList[i]->overlay->win) {
          __glutWindowCache = __glutWindowList[i];
          return __glutWindowCache;
        }
      }
    }
  }
#if !defined(_WIN32)
  {
    GLUTstale *entry;

    /* Scan through destroyed overlay window IDs for which no
       DestroyNotify has yet been received. */
    for (entry = __glutStaleWindowList; entry; entry = entry->next) {
      if (entry->win == win)
        return entry->window;
    }
  }
#endif
  return NULL;
}

/* CENTRY */
int GLUTAPIENTRY
glutGetWindow(void)
{
  if (__glutCurrentWindow) {
    return __glutCurrentWindow->num + 1;
  } else {
    return 0;
  }
}
/* ENDCENTRY */

void
__glutSetWindow(GLUTwindow * window)
{
  /* It is tempting to try to short-circuit the call to
     glXMakeCurrent if we "know" we are going to make current
     to a window we are already current to.  In fact, this
     assumption breaks when GLUT is expected to integrated with
     other OpenGL windowing APIs that also make current to
     OpenGL contexts.  Since glXMakeCurrent short-circuits the
     "already bound" case, GLUT avoids the temptation to do so
     too. */
  __glutCurrentWindow = window;

  MAKE_CURRENT_LAYER(__glutCurrentWindow);

#if !defined(_WIN32)
  /* We should be careful to force a finish between each
     iteration through the GLUT main loop if indirect OpenGL 
     contexts are in use; indirect contexts tend to have  much
     longer latency because lots of OpenGL extension requests
     can queue up in the X protocol stream.  We accomplish this
     by posting GLUT_FINISH_WORK to be done. */
  if (!__glutCurrentWindow->isDirect)
    __glutPutOnWorkList(__glutCurrentWindow, GLUT_FINISH_WORK);
#endif

  /* If debugging is enabled, we'll want to check this window
     for any OpenGL errors every iteration through the GLUT
     main loop.  To accomplish this, we post the
     GLUT_DEBUG_WORK to be done on this window. */
  if (__glutDebug) {
    __glutPutOnWorkList(__glutCurrentWindow, GLUT_DEBUG_WORK);
  }
}

/* CENTRY */
void GLUTAPIENTRY
glutSetWindow(int win)
{
  GLUTwindow *window;

  if (win < 1 || win > __glutWindowListSize) {
    __glutWarning("glutSetWindow attempted on bogus window.");
    return;
  }
  window = __glutWindowList[win - 1];
  if (!window) {
    __glutWarning("glutSetWindow attempted on bogus window.");
    return;
  }
  __glutSetWindow(window);
}
/* ENDCENTRY */

static int
getUnusedWindowSlot(void)
{
  int i;

  /* Look for allocated, unused slot. */
  for (i = 0; i < __glutWindowListSize; i++) {
    if (!__glutWindowList[i]) {
      return i;
    }
  }
  /* Allocate a new slot. */
  __glutWindowListSize++;
  if (__glutWindowList) {
    __glutWindowList = (GLUTwindow **)
      realloc(__glutWindowList,
      __glutWindowListSize * sizeof(GLUTwindow *));
  } else {
    /* XXX Some realloc's do not correctly perform a malloc
       when asked to perform a realloc on a NULL pointer,
       though the ANSI C library spec requires this. */
    __glutWindowList = (GLUTwindow **)
      malloc(sizeof(GLUTwindow *));
  }
  if (!__glutWindowList)
    __glutFatalError("out of memory.");
  __glutWindowList[__glutWindowListSize - 1] = NULL;
  return __glutWindowListSize - 1;
}

static XVisualInfo *
getVisualInfoCI(unsigned int mode)
{
  static int bufSizeList[] =
  {16, 12, 8, 4, 2, 1, 0};
  XVisualInfo *vi;
  int list[32];
  int i, n = 0;

  /* Should not be looking at display mode mask if
     __glutDisplayString is non-NULL. */
  assert(!__glutDisplayString);

  list[n++] = GLX_BUFFER_SIZE;
  list[n++] = 1;
  if (GLUT_WIND_IS_DOUBLE(mode)) {
    list[n++] = GLX_DOUBLEBUFFER;
  }
  if (GLUT_WIND_IS_STEREO(mode)) {
    list[n++] = GLX_STEREO;
  }
  if (GLUT_WIND_HAS_DEPTH(mode)) {
    list[n++] = GLX_DEPTH_SIZE;
    list[n++] = 1;
  }
  if (GLUT_WIND_HAS_STENCIL(mode)) {
    list[n++] = GLX_STENCIL_SIZE;
    list[n++] = 1;
  }
  list[n] = (int) None; /* terminate list */

  /* glXChooseVisual specify GLX_BUFFER_SIZE prefers the
     "smallest index buffer of at least the specified size".
     This would be reasonable if GLUT allowed the user to
     specify the required buffe size, but GLUT's display mode
     is too simplistic (easy to use?). GLUT should try to find
     the "largest".  So start with a large buffer size and
     shrink until we find a matching one that exists. */

  for (i = 0; bufSizeList[i]; i++) {
    /* XXX Assumes list[1] is where GLX_BUFFER_SIZE parameter
       is. */
    list[1] = bufSizeList[i];
    vi = glXChooseVisual(__glutDisplay,
      __glutScreen, list);
    if (vi)
      return vi;
  }
  return NULL;
}

static XVisualInfo *
getVisualInfoRGB(unsigned int mode)
{
  int list[32];
  int n = 0;

  /* Should not be looking at display mode mask if
     __glutDisplayString is non-NULL. */
  assert(!__glutDisplayString);

  /* XXX Would a caching mechanism to minize the calls to
     glXChooseVisual? You'd have to reference count
     XVisualInfo* pointers.  Would also have to properly
     interact with glutInitDisplayString. */

  list[n++] = GLX_RGBA;
  list[n++] = GLX_RED_SIZE;
  list[n++] = 1;
  list[n++] = GLX_GREEN_SIZE;
  list[n++] = 1;
  list[n++] = GLX_BLUE_SIZE;
  list[n++] = 1;
  if (GLUT_WIND_HAS_ALPHA(mode)) {
    list[n++] = GLX_ALPHA_SIZE;
    list[n++] = 1;
  }
  if (GLUT_WIND_IS_DOUBLE(mode)) {
    list[n++] = GLX_DOUBLEBUFFER;
  }
  if (GLUT_WIND_IS_STEREO(mode)) {
    list[n++] = GLX_STEREO;
  }
  if (GLUT_WIND_HAS_DEPTH(mode)) {
    list[n++] = GLX_DEPTH_SIZE;
    list[n++] = 1;
  }
  if (GLUT_WIND_HAS_STENCIL(mode)) {
    list[n++] = GLX_STENCIL_SIZE;
    list[n++] = 1;
  }
  if (GLUT_WIND_HAS_ACCUM(mode)) {
    list[n++] = GLX_ACCUM_RED_SIZE;
    list[n++] = 1;
    list[n++] = GLX_ACCUM_GREEN_SIZE;
    list[n++] = 1;
    list[n++] = GLX_ACCUM_BLUE_SIZE;
    list[n++] = 1;
    if (GLUT_WIND_HAS_ALPHA(mode)) {
      list[n++] = GLX_ACCUM_ALPHA_SIZE;
      list[n++] = 1;
    }
  }
#if defined(GLX_VERSION_1_1) && (defined(GLX_SGIS_multisample) || defined(GLX_ARB_multisample))
  if (GLUT_WIND_IS_MULTISAMPLE(mode)) {
    if (!__glutIsSupportedByGLX("GLX_SGIS_multisample") &&
        !__glutIsSupportedByGLX("GLX_ARB_multisample"))
      return NULL;
#if defined(GLX_ARB_multisample)
    list[n++] = GLX_SAMPLES_ARB;
#elif defined(GLX_SGIS_multisample)
    list[n++] = GLX_SAMPLES_SGIS;
#endif
    /* XXX Is 4 a reasonable minimum acceptable number of
       samples? */
    list[n++] = 4;
  }
#endif
  list[n] = (int) None; /* terminate list */

  return glXChooseVisual(__glutDisplay,
    __glutScreen, list);
}

XVisualInfo *
__glutGetVisualInfo(unsigned int mode)
{
  /* XXX GLUT_LUMINANCE not implemented for GLUT 3.0. */
  if (GLUT_WIND_IS_LUMINANCE(mode))
    return NULL;

  if (GLUT_WIND_IS_RGB(mode))
    return getVisualInfoRGB(mode);
  else
    return getVisualInfoCI(mode);
}

XVisualInfo *
__glutDetermineVisual(
  unsigned int displayMode,
  Bool * treatAsSingle,
  XVisualInfo * (getVisualInfo) (unsigned int))
{
  XVisualInfo *vis;

  /* Should not be looking at display mode mask if
     __glutDisplayString is non-NULL. */
  assert(!__glutDisplayString);

  *treatAsSingle = GLUT_WIND_IS_SINGLE(displayMode);
  vis = getVisualInfo(displayMode);
  if (!vis) {
    /* Fallback cases when can't get exactly what was asked
       for... */
    if (GLUT_WIND_IS_SINGLE(displayMode)) {
      /* If we can't find a single buffered visual, try looking
         for a double buffered visual.  We can treat a double
         buffered visual as a single buffer visual by changing
         the draw buffer to GL_FRONT and treating any swap
         buffers as no-ops. */
      displayMode |= GLUT_DOUBLE;
      vis = getVisualInfo(displayMode);
      *treatAsSingle = True;
    }
    if (!vis && GLUT_WIND_IS_MULTISAMPLE(displayMode)) {
      /* If we can't seem to get multisampling (ie, not Reality
         Engine class graphics!), go without multisampling.  It
         is up to the application to query how many multisamples
         were allocated (0 equals no multisampling) if the
         application is going to use multisampling for more than
         just antialiasing. */
      displayMode &= ~GLUT_MULTISAMPLE;
      vis = getVisualInfo(displayMode);
    }
  }
  return vis;
}

static void GLUTCALLBACK
__glutDefaultDisplay(void)
{
  /* XXX Remove the warning after GLUT 3.0. */
  __glutWarning("The following is a new check for GLUT 3.0; update your code.");
  __glutFatalError(
    "redisplay needed for window %d, but no display callback.",
    __glutCurrentWindow->num + 1);
}

void GLUTCALLBACK
__glutDefaultReshape(int width, int height)
{
  GLUToverlay *overlay;

  /* Adjust the viewport of the window (and overlay if one
     exists). */
  MAKE_CURRENT_WINDOW(__glutCurrentWindow);
  glViewport(0, 0, (GLsizei) width, (GLsizei) height);
  overlay = __glutCurrentWindow->overlay;
  if (overlay) {
    MAKE_CURRENT_OVERLAY(overlay);
    glViewport(0, 0, (GLsizei) width, (GLsizei) height);
  }
  /* Make sure we are current to the current layer (application
     should be able to count on the current layer not changing
     unless the application explicitly calls glutUseLayer). */
  MAKE_CURRENT_LAYER(__glutCurrentWindow);
}

XVisualInfo *
__glutDetermineWindowVisual(Bool * treatAsSingle, Bool * visAlloced, void **fbc)
{
  if (__glutDisplayString) {

    /* __glutDisplayString should be NULL except if
       glutInitDisplayString has been called to register a
       different display string.  Calling glutInitDisplayString
       means using a string instead of an integer mask determine
       the visual to use. Using the function pointer variable
       __glutDetermineVisualFromString below avoids linking in
       the code for implementing glutInitDisplayString (ie,
       glut_dstr.o) unless glutInitDisplayString gets called by
       the application. */

    assert(__glutDetermineVisualFromString);
    *visAlloced = False;
    *fbc = NULL;
    return __glutDetermineVisualFromString(__glutDisplayString, treatAsSingle,
      requiredWindowCriteria, numRequiredWindowCriteria, requiredWindowCriteriaMask, fbc);
  } else {
    *visAlloced = True;
    *fbc = NULL;
    return __glutDetermineVisual(__glutDisplayMode,
      treatAsSingle, __glutGetVisualInfo);
  }
}

/* ARGSUSED5 */  /* Only Win32 uses gameMode parameter. */
GLUTwindow *
__glutCreateWindow(GLUTwindow * parent,
  int x, int y, int width, int height, int gameMode)
{
  GLUTwindow *window;
  XSetWindowAttributes wa;
  unsigned long attribMask;
  int winnum;
  int i;
  void *fbc;

#if defined(_WIN32)
  WNDCLASS wc;
  int style;

  if (!GetClassInfo(GetModuleHandle(NULL), "GLUT", &wc)) {
    __glutOpenWin32Connection(NULL);
  }
#else
  if (!__glutDisplay) {
    __glutOpenXConnection(NULL);
  }
#endif
  if (__glutGameModeWindow) {
    __glutFatalError("cannot create windows in game mode.");
  }
  winnum = getUnusedWindowSlot();
  window = (GLUTwindow *) malloc(sizeof(GLUTwindow));
  if (!window) {
    __glutFatalError("out of memory.");
  }
  window->num = winnum;

#if !defined(_WIN32)
  window->vis = __glutDetermineWindowVisual(&window->treatAsSingle,
    &window->visAlloced, &fbc);
  if (!window->vis) {
    __glutFatalError(
      "visual with necessary capabilities not found.");
  }
  __glutSetupColormap(window->vis, &window->colormap, &window->cmap);
#endif
  window->eventMask = StructureNotifyMask | ExposureMask;