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-rw-r--r--src/glut/glx/glut_vidresize.c230
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diff --git a/src/glut/glx/glut_vidresize.c b/src/glut/glx/glut_vidresize.c
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+++ b/src/glut/glx/glut_vidresize.c
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+
+/* 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>
+
+#if !defined(_WIN32)
+#include <GL/glx.h>
+#endif
+
+#ifdef __sgi
+#include <dlfcn.h>
+#endif
+
+#include "glutint.h"
+
+/* Grumble. The IRIX 6.3 and early IRIX 6.4 OpenGL headers
+ support the video resize extension, but failed to define
+ GLX_SGIX_video_resize. */
+#ifdef GLX_SYNC_FRAME_SGIX
+#define GLX_SGIX_video_resize 1
+#endif
+
+#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_video_resize)
+static int canVideoResize = -1;
+static int videoResizeChannel;
+#else
+static int canVideoResize = 0;
+#endif
+static int videoResizeInUse = 0;
+static int dx = -1, dy = -1, dw = -1, dh = -1;
+
+/* XXX Note that IRIX 6.2, 6.3, and some 6.4 versions have a
+ bug where programs seg-fault when they attempt video
+ resizing from an indirect OpenGL context (either local or
+ over a network). */
+
+#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_video_resize)
+
+static volatile int errorCaught;
+
+/* ARGSUSED */
+static
+catchXSGIvcErrors(Display * dpy, XErrorEvent * event)
+{
+ errorCaught = 1;
+ return 0;
+}
+#endif
+
+/* CENTRY */
+int APIENTRY
+glutVideoResizeGet(GLenum param)
+{
+#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_video_resize)
+ if (canVideoResize < 0) {
+ canVideoResize = __glutIsSupportedByGLX("GLX_SGIX_video_resize");
+ if (canVideoResize) {
+#if __sgi
+ /* This is a hack because IRIX 6.2, 6.3, and some 6.4
+ versions were released with GLX_SGIX_video_resize
+ being advertised by the X server though the video
+ resize extension is not actually supported. We try to
+ determine if the libGL.so we are using actually has a
+ video resize entrypoint before we try to use the
+ feature. */
+ void (*func) (void);
+ void *glxDso = dlopen("libGL.so", RTLD_LAZY);
+
+ func = (void (*)(void)) dlsym(glxDso, "glXQueryChannelDeltasSGIX");
+ if (!func) {
+ canVideoResize = 0;
+ } else
+#endif
+ {
+ char *channelString;
+ int (*handler) (Display *, XErrorEvent *);
+
+ channelString = getenv("GLUT_VIDEO_RESIZE_CHANNEL");
+ videoResizeChannel = channelString ? atoi(channelString) : 0;
+
+ /* Work around another annoying problem with SGI's
+ GLX_SGIX_video_resize implementation. Early IRIX
+ 6.4 OpenGL's advertise the extension and have the
+ video resize API, but an XSGIvc X protocol errors
+ result trying to use the API. Set up an error
+ handler to intercept what would otherwise be a fatal
+ error. If an error was recieved, do not report that
+ video resize is possible. */
+ handler = XSetErrorHandler(catchXSGIvcErrors);
+
+ errorCaught = 0;
+
+ glXQueryChannelDeltasSGIX(__glutDisplay, __glutScreen,
+ videoResizeChannel, &dx, &dy, &dw, &dh);
+
+ /* glXQueryChannelDeltasSGIX is an inherent X server
+ round-trip so we know we will have gotten either the
+ correct reply or and error by this time. */
+ XSetErrorHandler(handler);
+
+ /* Still yet another work around. In IRIX 6.4 betas,
+ glXQueryChannelDeltasSGIX will return as if it
+ succeeded, but the values are filled with junk.
+ Watch to make sure the delta variables really make
+ sense. */
+ if (errorCaught ||
+ dx < 0 || dy < 0 || dw < 0 || dh < 0 ||
+ dx > 2048 || dy > 2048 || dw > 2048 || dh > 2048) {
+ canVideoResize = 0;
+ }
+ }
+ }
+ }
+#endif /* GLX_SGIX_video_resize */
+
+ switch (param) {
+ case GLUT_VIDEO_RESIZE_POSSIBLE:
+ return canVideoResize;
+ case GLUT_VIDEO_RESIZE_IN_USE:
+ return videoResizeInUse;
+ case GLUT_VIDEO_RESIZE_X_DELTA:
+ return dx;
+ case GLUT_VIDEO_RESIZE_Y_DELTA:
+ return dy;
+ case GLUT_VIDEO_RESIZE_WIDTH_DELTA:
+ return dw;
+ case GLUT_VIDEO_RESIZE_HEIGHT_DELTA:
+ return dh;
+ case GLUT_VIDEO_RESIZE_X:
+ case GLUT_VIDEO_RESIZE_Y:
+ case GLUT_VIDEO_RESIZE_WIDTH:
+ case GLUT_VIDEO_RESIZE_HEIGHT:
+#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_video_resize)
+ if (videoResizeInUse) {
+ int x, y, width, height;
+
+ glXQueryChannelRectSGIX(__glutDisplay, __glutScreen,
+ videoResizeChannel, &x, &y, &width, &height);
+ switch (param) {
+ case GLUT_VIDEO_RESIZE_X:
+ return x;
+ case GLUT_VIDEO_RESIZE_Y:
+ return y;
+ case GLUT_VIDEO_RESIZE_WIDTH:
+ return width;
+ case GLUT_VIDEO_RESIZE_HEIGHT:
+ return height;
+ }
+ }
+#endif
+ return -1;
+ default:
+ __glutWarning("invalid glutVideoResizeGet parameter: %d", param);
+ return -1;
+ }
+}
+
+void APIENTRY
+glutSetupVideoResizing(void)
+{
+#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_video_resize)
+ if (glutVideoResizeGet(GLUT_VIDEO_RESIZE_POSSIBLE)) {
+ glXBindChannelToWindowSGIX(__glutDisplay, __glutScreen,
+ videoResizeChannel, __glutCurrentWindow->win);
+ videoResizeInUse = 1;
+ } else
+#endif
+ __glutFatalError("glutEstablishVideoResizing: video resizing not possible.\n");
+}
+
+void APIENTRY
+glutStopVideoResizing(void)
+{
+#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_video_resize)
+ if (glutVideoResizeGet(GLUT_VIDEO_RESIZE_POSSIBLE)) {
+ if (videoResizeInUse) {
+ glXBindChannelToWindowSGIX(__glutDisplay, __glutScreen,
+ videoResizeChannel, None);
+ videoResizeInUse = 0;
+ }
+ }
+#endif
+}
+
+/* ARGSUSED */
+void APIENTRY
+glutVideoResize(int x, int y, int width, int height)
+{
+#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_video_resize)
+ if (videoResizeInUse) {
+#ifdef GLX_SYNC_SWAP_SGIX
+ /* glXChannelRectSyncSGIX introduced in a patch to IRIX
+ 6.2; the original unpatched IRIX 6.2 behavior is always
+ GLX_SYNC_SWAP_SGIX. */
+ glXChannelRectSyncSGIX(__glutDisplay, __glutScreen,
+ videoResizeChannel, GLX_SYNC_SWAP_SGIX);
+#endif
+ glXChannelRectSGIX(__glutDisplay, __glutScreen,
+ videoResizeChannel, x, y, width, height);
+ }
+#endif
+}
+
+/* ARGSUSED */
+void APIENTRY
+glutVideoPan(int x, int y, int width, int height)
+{
+#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_video_resize)
+ if (videoResizeInUse) {
+#ifdef GLX_SYNC_FRAME_SGIX
+ /* glXChannelRectSyncSGIX introduced in a patch to IRIX
+ 6.2; the original unpatched IRIX 6.2 behavior is always
+ GLX_SYNC_SWAP_SGIX. We just ignore that we cannot
+ accomplish GLX_SYNC_FRAME_SGIX on IRIX unpatched 6.2;
+ this means you'd need a glutSwapBuffers to actually
+ realize the video resize. */
+ glXChannelRectSyncSGIX(__glutDisplay, __glutScreen,
+ videoResizeChannel, GLX_SYNC_FRAME_SGIX);
+#endif
+ glXChannelRectSGIX(__glutDisplay, __glutScreen,
+ videoResizeChannel, x, y, width, height);
+ }
+#endif
+}
+
+/* ENDCENTRY */