diff options
Diffstat (limited to 'src/glut/glx/glut_vidresize.c')
| -rw-r--r-- | src/glut/glx/glut_vidresize.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/glut/glx/glut_vidresize.c b/src/glut/glx/glut_vidresize.c new file mode 100644 index 0000000000..5b82573478 --- /dev/null +++ b/src/glut/glx/glut_vidresize.c @@ -0,0 +1,230 @@ + +/* 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 */ |