diff options
Diffstat (limited to 'src/glut/glx/glut_overlay.c')
| -rw-r--r-- | src/glut/glx/glut_overlay.c | 608 |
1 files changed, 0 insertions, 608 deletions
diff --git a/src/glut/glx/glut_overlay.c b/src/glut/glx/glut_overlay.c deleted file mode 100644 index ce8e68d..0000000 --- a/src/glut/glx/glut_overlay.c +++ /dev/null @@ -1,608 +0,0 @@ - -/* Copyright (c) Mark J. Kilgard, 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. */ - -#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/Xutil.h> -#if defined (__vms) -#include <Xmu/StdCmap.h> /* for XmuLookupStandardColormap */ -#else -#include <X11/Xmu/StdCmap.h> /* for XmuLookupStandardColormap */ -#endif -#endif /* !_WIN32 */ - -#include "glutint.h" -#include "layerutil.h" - -static Criterion requiredOverlayCriteria[] = -{ - {LEVEL, EQ, 1}, /* This entry gets poked in - determineOverlayVisual. */ - {TRANSPARENT, EQ, 1}, - {XPSEUDOCOLOR, EQ, 1}, - {RGBA, EQ, 0}, - {BUFFER_SIZE, GTE, 1} -}; -static int numRequiredOverlayCriteria = sizeof(requiredOverlayCriteria) / sizeof(Criterion); -static int requiredOverlayCriteriaMask = -(1 << LEVEL) | (1 << TRANSPARENT) | (1 << XSTATICGRAY) | (1 << RGBA) | (1 << CI_MODE); - -#if !defined(_WIN32) -static int -checkOverlayAcceptability(XVisualInfo * vi, unsigned int mode) -{ - int value; - - /* Must support OpenGL. */ - glXGetConfig(__glutDisplay, vi, GLX_USE_GL, &value); - if (!value) - return 1; - - /* Must be color index. */ - glXGetConfig(__glutDisplay, vi, GLX_RGBA, &value); - if (value) - return 1; - - /* Must match single/double buffering request. */ - glXGetConfig(__glutDisplay, vi, GLX_DOUBLEBUFFER, &value); - if (GLUT_WIND_IS_DOUBLE(mode) != (value != 0)) - return 1; - - /* Must match mono/stereo request. */ - glXGetConfig(__glutDisplay, vi, GLX_STEREO, &value); - if (GLUT_WIND_IS_STEREO(mode) != (value != 0)) - return 1; - - /* Alpha and accumulation buffers incompatible with color - index. */ - if (GLUT_WIND_HAS_ALPHA(mode) || GLUT_WIND_HAS_ACCUM(mode)) - return 1; - - /* Look for depth buffer if requested. */ - glXGetConfig(__glutDisplay, vi, GLX_DEPTH_SIZE, &value); - if (GLUT_WIND_HAS_DEPTH(mode) && (value <= 0)) - return 1; - - /* Look for stencil buffer if requested. */ - glXGetConfig(__glutDisplay, vi, GLX_STENCIL_SIZE, &value); - if (GLUT_WIND_HAS_STENCIL(mode) && (value <= 0)) - return 1; - -#if defined(GLX_VERSION_1_1) && (defined(GLX_SGIS_multisample) || defined(GLX_ARB_multisample)) - /* XXX Multisampled overlay color index?? Pretty unlikely. */ - /* Look for multisampling if requested. */ - if (__glutIsSupportedByGLX("GLX_SGIS_multisample") || - __glutIsSupportedByGLX("GLX_ARB_multisample")) - glXGetConfig(__glutDisplay, vi, GLX_SAMPLES_SGIS, &value); - else - value = 0; - if (GLUT_WIND_IS_MULTISAMPLE(mode) && (value <= 0)) - return 1; -#endif - - return 0; -} -#endif - -static XVisualInfo * -getOverlayVisualInfoCI(unsigned int mode) -{ -#if !defined(_WIN32) - XLayerVisualInfo *vi; - XLayerVisualInfo template; - XVisualInfo *goodVisual, *returnVisual; - int nitems, i, j, bad; - - /* The GLX 1.0 glXChooseVisual is does not permit queries - based on pixel transparency (and GLX_BUFFER_SIZE uses - "smallest that meets" its requirement instead of "largest - that meets" that GLUT wants. So, GLUT implements its own - visual selection routine for color index overlays. */ - - /* Try three overlay layers. */ - for (i = 1; i <= 3; i++) { - template.vinfo.screen = __glutScreen; - template.vinfo.class = PseudoColor; - template.layer = i; - template.type = TransparentPixel; - vi = __glutXGetLayerVisualInfo(__glutDisplay, - VisualTransparentType | VisualScreenMask | VisualClassMask | VisualLayerMask, - &template, &nitems); - if (vi) { - /* Check list for acceptable visual meeting requirements - of requested display mode. */ - for (j = 0; j < nitems; j++) { - bad = checkOverlayAcceptability(&vi[j].vinfo, mode); - if (bad) { - /* Set vi[j].vinfo.visual to mark it unacceptable. */ - vi[j].vinfo.visual = NULL; - } - } - - /* Look through list to find deepest acceptable visual. */ - goodVisual = NULL; - for (j = 0; j < nitems; j++) { - if (vi[j].vinfo.visual) { - if (goodVisual == NULL) { - goodVisual = &vi[j].vinfo; - } else { - if (goodVisual->depth < vi[j].vinfo.depth) { - goodVisual = &vi[j].vinfo; - } - } - } - } - - /* If a visual is found, clean up and return the visual. */ - if (goodVisual) { - returnVisual = (XVisualInfo *) malloc(sizeof(XVisualInfo)); - if (returnVisual) { - *returnVisual = *goodVisual; - } - XFree(vi); - return returnVisual; - } - XFree(vi); - } - } -#endif /* !_WIN32 */ - return NULL; -} - -/* ARGSUSED */ -static XVisualInfo * -getOverlayVisualInfoRGB(unsigned int mode) -{ - - /* XXX For now, transparent RGBA overlays are not supported - by GLUT. RGBA overlays raise difficult questions about - what the transparent pixel (really color) value should be. - - Color index overlay transparency is "easy" because the - transparent pixel value does not affect displayable colors - (except for stealing one color cell) since colors are - determined by indirection through a colormap, and because - it is uncommon for arbitrary pixel values in color index to - be "calculated" (as can occur with a host of RGBA operations - like lighting, blending, etc) so it is easy to avoid the - transparent pixel value. - - Since it is typically easy to avoid the transparent pixel - value in color index mode, if GLUT tells the programmer what - pixel is transparent, then most program can easily avoid - generating that pixel value except when they intend - transparency. GLUT returns whatever transparent pixel value - is provided by the system through glutGet( - GLUT_TRANSPARENT_INDEX). - - Theory versus practice for RGBA overlay transparency: In - theory, the reasonable thing is enabling overlay transparency - when an overlay pixel's destination alpha is 0 because this - allows overlay transparency to be controlled via alpha and all - visibile colors are permited, but no hardware I am aware of - supports this practice (and it requires destination alpha which - is typically optional and quite uncommon for overlay windows!). - - In practice, the choice of transparent pixel value is typically - "hardwired" into most graphics hardware to a single pixel value. - SGI hardware uses true black (0,0,0) without regard for the - destination alpha. This is far from ideal because true black (a - common color that is easy to accidently generate) can not be - generated in an RGBA overlay. I am not sure what other vendors - do. - - Pragmatically, most of the typical things you want to do in the - overlays can be done in color index (rubber banding, pop-up - menus, etc.). One solution for GLUT would be to simply - "advertise" what RGB triple (or possibly RGBA quadruple or simply - A alone) generates transparency. The problem with this approach - is that it forces programmers to avoid whatever arbitrary color - various systems decide is transparent. This is a difficult - burden to place on programmers that want to portably make use of - overlays. - - To actually support transparent RGBA overlays, there are really - two reaonsable options. ONE: Simply mandate that true black is - the RGBA overlay transparent color (what IRIS GL did). This is - nice for programmers since only one option, nice for existing SGI - hardware, bad for anyone (including SGI) who wants to improve - upon "true black" RGB transparency. - - Or TWO: Provide a set of queriable "transparency types" (like - "true black" or "alpha == 0" or "true white" or even a queriable - transparent color). This is harder for programmers, OK for - existing SGI hardware, and it leaves open the issue of what other - modes are reasonable. - - Option TWO seems the more general approach, but since hardware - designers will likely only implement a single mode (this is a - scan out issue where bandwidth is pressing issue), codifying - multiple speculative approaches nobody may ever implement seems - silly. And option ONE fiats a suboptimal solution. - - Therefore, I defer any decision of how GLUT should support RGBA - overlay transparency and leave support for it unimplemented. - Nobody has been pressing me for RGBA overlay transparency (though - people have requested color index overlay transparency - repeatedly). Geez, if you read this far you are either really - bored or maybe actually interested in this topic. Anyway, if - you have ideas (particularly if you plan on implementing a - hardware scheme for RGBA overlay transparency), I'd be - interested. - - For the record, SGI's expiremental Framebufer Configuration - experimental GLX extension uses option TWO. Transparency modes - for "none" and "RGB" are defined (others could be defined later). - What RGB value is the transparent one must be queried. - - I was hoping GLUT could have something that required less work - from the programmer to use portably. -mjk */ - - __glutWarning("RGBA overlays are not supported by GLUT (for now)."); - return NULL; -} - -static XVisualInfo * -getOverlayVisualInfo(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 getOverlayVisualInfoRGB(mode); - else - return getOverlayVisualInfoCI(mode); -} - -#if !defined(_WIN32) - -/* The GLUT overlay can come and go, and the overlay window has - a distinct X window ID. Logically though, GLUT treats the - normal and overlay windows as a unified window. In - particular, X input events typically go to the overlay window - since it is "on top of" the normal window. When an overlay - window ID is destroyed (due to glutRemoveOverlay or a call to - glutEstablishOverlay when an overlay already exists), we - still keep track of the overlay window ID until we get back a - DestroyNotify event for the overlay window. Otherwise, we - could lose track of X input events sent to a destroyed - overlay. To avoid this, we keep the destroyed overlay window - ID on a "stale window" list. This lets us properly route X - input events generated on destroyed overlay windows to the - proper GLUT window. */ -static void -addStaleWindow(GLUTwindow * window, Window win) -{ - GLUTstale *entry; - - entry = (GLUTstale *) malloc(sizeof(GLUTstale)); - if (!entry) - __glutFatalError("out of memory"); - entry->window = window; - entry->win = win; - entry->next = __glutStaleWindowList; - __glutStaleWindowList = entry; -} - -#endif - -void -__glutFreeOverlay(GLUToverlay * overlay) -{ - if (overlay->visAlloced) - XFree(overlay->vis); - XDestroyWindow(__glutDisplay, overlay->win); - glXDestroyContext(__glutDisplay, overlay->ctx); - if (overlay->colormap) { - /* Only color index overlays have colormap data structure. */ - __glutFreeColormap(overlay->colormap); - } - free(overlay); -} - -static XVisualInfo * -determineOverlayVisual(int *treatAsSingle, Bool * visAlloced, void **fbc) -{ - if (__glutDisplayString) { - XVisualInfo *vi; - int i; - - /* __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); - - /* Try three overlay layers. */ - *visAlloced = False; - *fbc = NULL; - for (i = 1; i <= 3; i++) { - requiredOverlayCriteria[0].value = i; - vi = __glutDetermineVisualFromString(__glutDisplayString, treatAsSingle, - requiredOverlayCriteria, numRequiredOverlayCriteria, - requiredOverlayCriteriaMask, fbc); - if (vi) { - return vi; - } - } - return NULL; - } else { - *visAlloced = True; - *fbc = NULL; - return __glutDetermineVisual(__glutDisplayMode, - treatAsSingle, getOverlayVisualInfo); - } -} - -/* CENTRY */ -void GLUTAPIENTRY -glutEstablishOverlay(void) -{ - GLUToverlay *overlay; - GLUTwindow *window; - XSetWindowAttributes wa; - void *fbc; - - /* Register a routine to free an overlay with glut_win.c; - this keeps glut_win.c from pulling in all of - glut_overlay.c when no overlay functionality is used by - the application. */ - __glutFreeOverlayFunc = __glutFreeOverlay; - - window = __glutCurrentWindow; - - /* Allow for an existant overlay to be re-established perhaps - if you wanted a different display mode. */ - if (window->overlay) { -#if !defined(_WIN32) - addStaleWindow(window, window->overlay->win); -#endif - __glutFreeOverlay(window->overlay); - } - overlay = (GLUToverlay *) malloc(sizeof(GLUToverlay)); - if (!overlay) - __glutFatalError("out of memory."); - - overlay->vis = determineOverlayVisual(&overlay->treatAsSingle, - &overlay->visAlloced, &fbc); - if (!overlay->vis) { - __glutFatalError("lacks overlay support."); - } - overlay->ctx = NULL; -#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_fbconfig) - if (fbc) { - window->ctx = __glut_glXCreateContextWithConfigSGIX(__glutDisplay, fbc, - GLX_RGBA_TYPE_SGIX, None, __glutTryDirect); - } else -#endif - { - overlay->ctx = glXCreateContext(__glutDisplay, overlay->vis, - None, __glutTryDirect); - } - if (!overlay->ctx) { - __glutFatalError( - "failed to create overlay OpenGL rendering context."); - } -#if !defined(_WIN32) - overlay->isDirect = glXIsDirect(__glutDisplay, overlay->ctx); - if (__glutForceDirect) { - if (!overlay->isDirect) { - __glutFatalError("direct rendering not possible."); - } - } -#endif - __glutSetupColormap(overlay->vis, &overlay->colormap, &overlay->cmap); - overlay->transparentPixel = __glutGetTransparentPixel(__glutDisplay, - overlay->vis); - wa.colormap = overlay->cmap; - wa.background_pixel = overlay->transparentPixel; - wa.event_mask = window->eventMask & GLUT_OVERLAY_EVENT_FILTER_MASK; - wa.border_pixel = 0; -#if defined(_WIN32) - /* XXX Overlays not supported in Win32 yet. */ -#else - overlay->win = XCreateWindow(__glutDisplay, - window->win, - 0, 0, window->width, window->height, 0, - overlay->vis->depth, InputOutput, overlay->vis->visual, - CWBackPixel | CWBorderPixel | CWEventMask | CWColormap, - &wa); -#endif - if (window->children) { - /* Overlay window must be lowered below any GLUT - subwindows. */ - XLowerWindow(__glutDisplay, overlay->win); - } - XMapWindow(__glutDisplay, overlay->win); - overlay->shownState = 1; - - overlay->display = NULL; - - /* Make sure a reshape gets delivered. */ - window->forceReshape = True; - -#if !defined(_WIN32) - __glutPutOnWorkList(__glutToplevelOf(window), GLUT_COLORMAP_WORK); -#endif - - window->overlay = overlay; - glutUseLayer(GLUT_OVERLAY); - - if (overlay->treatAsSingle) { - glDrawBuffer(GL_FRONT); - glReadBuffer(GL_FRONT); - } -} - -void GLUTAPIENTRY -glutRemoveOverlay(void) -{ - GLUTwindow *window = __glutCurrentWindow; - GLUToverlay *overlay = __glutCurrentWindow->overlay; - - if (!window->overlay) - return; - - /* If using overlay, switch to the normal layer. */ - if (window->renderWin == overlay->win) { - glutUseLayer(GLUT_NORMAL); - } -#if !defined(_WIN32) - addStaleWindow(window, overlay->win); -#endif - __glutFreeOverlay(overlay); - window->overlay = NULL; -#if !defined(_WIN32) - __glutPutOnWorkList(__glutToplevelOf(window), GLUT_COLORMAP_WORK); -#endif -} - -void GLUTAPIENTRY -glutUseLayer(GLenum layer) -{ - GLUTwindow *window = __glutCurrentWindow; - - switch (layer) { - case GLUT_NORMAL: -#ifdef _WIN32 - window->renderDc = window->hdc; -#endif - window->renderWin = window->win; - window->renderCtx = window->ctx; - break; - case GLUT_OVERLAY: - /* Did you crash here? Calling glutUseLayer(GLUT_OVERLAY) - without an overlay established is erroneous. Fix your - code. */ -#ifdef _WIN32 - window->renderDc = window->overlay->hdc; -#endif - window->renderWin = window->overlay->win; - window->renderCtx = window->overlay->ctx; - break; - default: - __glutWarning("glutUseLayer: unknown layer, %d.", layer); - break; - } - __glutSetWindow(window); -} - -void GLUTAPIENTRY -glutPostOverlayRedisplay(void) -{ - __glutPostRedisplay(__glutCurrentWindow, GLUT_OVERLAY_REDISPLAY_WORK); -} - -/* The advantage of this routine is that it saves the cost of a - glutSetWindow call (entailing an expensive OpenGL context - switch), particularly useful when multiple windows need - redisplays posted at the same times. */ -void GLUTAPIENTRY -glutPostWindowOverlayRedisplay(int win) -{ - __glutPostRedisplay(__glutWindowList[win - 1], GLUT_OVERLAY_REDISPLAY_WORK); -} - -void GLUTAPIENTRY -glutOverlayDisplayFunc(GLUTdisplayCB displayFunc) -{ - if (!__glutCurrentWindow->overlay) { - __glutWarning("glutOverlayDisplayFunc: window has no overlay established"); - return; - } - __glutCurrentWindow->overlay->display = displayFunc; -} - -void GLUTAPIENTRY -glutHideOverlay(void) -{ - if (!__glutCurrentWindow->overlay) { - __glutWarning("glutHideOverlay: window has no overlay established"); - return; - } - XUnmapWindow(__glutDisplay, __glutCurrentWindow->overlay->win); - __glutCurrentWindow->overlay->shownState = 0; -} - -void GLUTAPIENTRY -glutShowOverlay(void) -{ - if (!__glutCurrentWindow->overlay) { - __glutWarning("glutShowOverlay: window has no overlay established"); - return; - } - XMapWindow(__glutDisplay, __glutCurrentWindow->overlay->win); - __glutCurrentWindow->overlay->shownState = 1; -} - -int GLUTAPIENTRY -glutLayerGet(GLenum param) -{ - switch (param) { - case GLUT_OVERLAY_POSSIBLE: - { - XVisualInfo *vi; - Bool dummy, visAlloced; - void *fbc; - - vi = determineOverlayVisual(&dummy, &visAlloced, &fbc); - if (vi) { - if (visAlloced) - XFree(vi); - return 1; - } - return 0; - } - case GLUT_LAYER_IN_USE: - return __glutCurrentWindow->renderWin != __glutCurrentWindow->win; - case GLUT_HAS_OVERLAY: - return __glutCurrentWindow->overlay != NULL; - case GLUT_TRANSPARENT_INDEX: - if (__glutCurrentWindow->overlay) { - return __glutCurrentWindow->overlay->transparentPixel; - } else { - return -1; - } - case GLUT_NORMAL_DAMAGED: - /* __glutWindowDamaged is used so the damage state within - the window (or overlay belwo) can be cleared before - calling a display callback so on return, the state does - not have to be cleared (since upon return from the - callback the window could be destroyed (or layer - removed). */ - return (__glutCurrentWindow->workMask & GLUT_REPAIR_WORK) - || __glutWindowDamaged; - case GLUT_OVERLAY_DAMAGED: - if (__glutCurrentWindow->overlay) { - return (__glutCurrentWindow->workMask & GLUT_OVERLAY_REPAIR_WORK) - || __glutWindowDamaged; - } else { - return -1; - } - default: - __glutWarning("invalid glutLayerGet param: %d", param); - return -1; - } -} -/* ENDCENTRY */ |