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   1 /*
   2 This file is part of 3dengfx, realtime visualization system.
   3 Copyright (C) 2004, 2005, 2006 John Tsiombikas <nuclear@siggraph.org>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18 */
  19
  20 /* OpenGL through GLX (X Window System)
  21  *
  22  * Author: John Tsiombikas 2005
  23  */
  24
  25 #include "3dengfx_config.h"
  26
  27 #if GFX_LIBRARY == NATIVE && NATIVE_LIB == NATIVE_X11
  28
  29 #include <stdlib.h>
  30 #include "init.hpp"
  31 #include "gfx_library.h"
  32 #include "3dengfx/3denginefx.hpp"
  33 #include "common/err_msg.h"
  34
  35 #ifdef USE_XF86VIDMODE
  36 #include <X11/extensions/xf86vmode.h>
  37
  38 static XF86VidModeModeInfo orig_mode;
  39 #endif  // USE_XF86VIDMODE
  40
  41 Display *fxwt_x_dpy;
  42 Window fxwt_x_win;
  43 static GLXContext glx_ctx;
  44 static bool fullscreen = false;
  45
  46 bool fxwt::init_graphics(GraphicsInitParameters *gparams) {
  47         Display *dpy;
  48         Window win;
  49         info("Initializing GLX");
  50
  51         if(!(dpy = XOpenDisplay(0))) {
  52                 error("Could not connect to the X server");
  53                 return false;
  54         }
  55
  56         int screen = DefaultScreen(dpy);
  57         Window root_win = RootWindow(dpy, screen);
  58
  59         info("Trying to set video mode %dx%dx%d, d:%d s:%d %s", gparams->x, gparams->y, gparams->bpp, gparams->depth_bits, gparams->stencil_bits, gparams->fullscreen ? "fullscreen" : "windowed");
  60
  61         // determine color bits
  62         int color_bits = 1;
  63         if(!(gparams->dont_care_flags & DONT_CARE_BPP)) {
  64                 switch(gparams->bpp) {
  65                 case 32:
  66                 case 24:
  67                         color_bits = 8;
  68                         break;
  69
  70                 case 16:
  71                 case 15:
  72                         color_bits = 5;
  73                         break;
  74
  75                 case 12:
  76                         color_bits = 4;
  77                         break;
  78
  79                 default:
  80                         error("%s: Tried to set unsupported pixel format: %d bpp", __func__, gparams->bpp);
  81                 }
  82         }
  83
  84         // determine stencil bits
  85         int stencil_bits = gparams->stencil_bits;
  86         if(gparams->dont_care_flags & DONT_CARE_STENCIL) {
  87                 stencil_bits = 1;
  88         }
  89
  90         // determine zbuffer bits
  91         int zbits = gparams->depth_bits == 32 ? 24 : gparams->depth_bits;
  92         if(gparams->dont_care_flags & DONT_CARE_BPP) {
  93                 zbits = 1;
  94         }
  95
  96         int glx_attrib[] = {
  97                 GLX_RGBA, GLX_DOUBLEBUFFER,
  98                 GLX_RED_SIZE, color_bits,
  99                 GLX_GREEN_SIZE, color_bits,
 100                 GLX_BLUE_SIZE, color_bits,
 101                 GLX_DEPTH_SIZE, zbits,
 102                 GLX_STENCIL_SIZE, stencil_bits,
 103                 None
 104         };
 105
 106         XVisualInfo *vis_info;
 107         if(!(vis_info = glXChooseVisual(dpy, screen, glx_attrib))) {
 108                 error("%s: Could not set requested video mode", __func__);
 109                 XCloseDisplay(dpy);
 110                 return false;
 111         }
 112
 113         // check the video mode we got
 114         int arbits, agbits, abbits, azbits, astencilbits;
 115         glXGetConfig(dpy, vis_info, GLX_RED_SIZE, &arbits);
 116         glXGetConfig(dpy, vis_info, GLX_GREEN_SIZE, &agbits);
 117         glXGetConfig(dpy, vis_info, GLX_BLUE_SIZE, &abbits);
 118         glXGetConfig(dpy, vis_info, GLX_DEPTH_SIZE, &azbits);
 119         glXGetConfig(dpy, vis_info, GLX_STENCIL_SIZE, &astencilbits);
 120
 121         info("Initialized video mode:");
 122         info("    bpp: %d (%d%d%d)", arbits + agbits + abbits, arbits, agbits, abbits);
 123         info("zbuffer: %d", azbits);
 124         info("stencil: %d", astencilbits);
 125
 126         /* if the dont_care_flags does not contain DONT_CARE_BPP and our color bits
 127          * does not match, we should return failure, however we test against
 128          * the difference allowing a +/-1 difference in order to allow for 16bpp
 129          * formats of either 565 or 555 and consider them equal.
 130          */
 131         if(!(gparams->dont_care_flags & DONT_CARE_BPP) && abs(arbits - color_bits) > 1 && abs(agbits - color_bits) > 1 && abs(abbits - color_bits) > 1) {
 132                 error("%s: Could not set requested exact bpp mode", __func__);
 133                 XFree(vis_info);
 134                 XCloseDisplay(dpy);
 135                 return false;
 136         }
 137
 138         // now if we don't have DONT_CARE_DEPTH in the dont_care_flags check for
 139         // exact depth buffer format, however consider 24 and 32 bit the same
 140         if(!(gparams->dont_care_flags & DONT_CARE_DEPTH) && azbits != zbits) {
 141                 if(!(zbits == 32 && azbits == 24 || zbits == 24 && azbits == 32)) {
 142                         error("%s: Could not set requested exact zbuffer depth", __func__);
 143                         XFree(vis_info);
 144                         XCloseDisplay(dpy);
 145                         return false;
 146                 }
 147         }
 148
 149         // if we don't have DONT_CARE_STENCIL make sure we have the stencil format
 150         // that was asked.
 151         if(!(gparams->dont_care_flags & DONT_CARE_STENCIL) && astencilbits != gparams->stencil_bits) {
 152                 error("%s: Could not set exact stencil format", __func__);
 153                 XFree(vis_info);
 154                 XCloseDisplay(dpy);
 155                 return false;
 156         }
 157
 158         // everything is ok, create the context
 159         if(!(glx_ctx = glXCreateContext(dpy, vis_info, 0, True))) {
 160                 error("%s: Failed to create GLX context", __func__);
 161                 XFree(vis_info);
 162                 XCloseDisplay(dpy);
 163                 return false;
 164         }
 165
 166         XSetWindowAttributes xattr;
 167         xattr.background_pixel = xattr.border_pixel = BlackPixel(dpy, screen);
 168         xattr.colormap = XCreateColormap(dpy, root_win, vis_info->visual, AllocNone);
 169
 170         if(gparams->fullscreen) {
 171                 // TODO: also test for "XFree86-VidModeExtension"
 172 #ifdef USE_XF86VIDMODE
 173                 info("Using XF86VidMode extension for fullscreen resolution switch.");
 174
 175                 XF86VidModeModeInfo **modes;
 176                 XF86VidModeModeInfo *vid_mode = 0;
 177                 int mode_count;
 178
 179                 XF86VidModeGetAllModeLines(dpy, screen, &mode_count, &modes);
 180                 orig_mode = *modes[0];
 181
 182                 for(int i=0; i<mode_count; i++) {
 183                         if(modes[i]->hdisplay == gparams->x && modes[i]->vdisplay == gparams->y) {
 184                                 vid_mode = modes[i];
 185                         }
 186                 }
 187                 if(!vid_mode) {
 188                         error("Could not set requested video mode");
 189                         XFree(modes);
 190                         XFree(vis_info);
 191                         XCloseDisplay(dpy);
 192                         return -1;
 193                 }
 194
 195                 XF86VidModeSwitchToMode(dpy, screen, vid_mode);
 196                 XF86VidModeSetViewPort(dpy, screen, 0, 0);
 197                 XFree(modes);
 198
 199                 xattr.override_redirect = True;
 200                 win = XCreateWindow(dpy, root_win, 0, 0, gparams->x, gparams->y, 0, vis_info->depth,
 201                                 InputOutput, vis_info->visual, CWColormap | CWBackPixel | CWBorderPixel | CWOverrideRedirect, &xattr);
 202
 203                 XWarpPointer(dpy, None, win, 0, 0, 0, 0, 0, 0);
 204                 XMapRaised(dpy, win);
 205         XGrabKeyboard(dpy, win, True, GrabModeAsync, GrabModeAsync, CurrentTime);
 206         XGrabPointer(dpy, win, True, ButtonPressMask, GrabModeAsync, GrabModeAsync, win, None, CurrentTime);
 207 #else
 208                 info("Resolution switching is not compiled or not supported by the X server, using a full-screen window.");
 209
 210                 XWindowAttributes root_attr;
 211                 XGetWindowAttributes(dpy, root_win, &root_attr);
 212
 213                 gparams->x = root_attr.width;
 214                 gparams->y = root_attr.height;
 215                 xattr.override_redirect = True;
 216                 win = XCreateWindow(dpy, root_win, 0, 0, gparams->x, gparams->y, 0, vis_info->depth,
 217                                 InputOutput, vis_info->visual, CWColormap | CWBackPixel | CWBorderPixel | CWOverrideRedirect, &xattr);
 218
 219                 XWarpPointer(dpy, None, win, 0, 0, 0, 0, 0, 0);
 220                 XMapRaised(dpy, win);
 221         XGrabKeyboard(dpy, win, True, GrabModeAsync, GrabModeAsync, CurrentTime);
 222         XGrabPointer(dpy, win, True, ButtonPressMask, GrabModeAsync, GrabModeAsync, win, None, CurrentTime);
 223 #endif  // USE_XF86VIDMODE
 224
 225                 fullscreen = true;
 226         } else {
 227                 win = XCreateWindow(dpy, root_win, 0, 0, gparams->x, gparams->y, 0, vis_info->depth,
 228                                 InputOutput, vis_info->visual, CWColormap | CWBackPixel | CWBorderPixel, &xattr);
 229         }
 230
 231         long events = ExposureMask | StructureNotifyMask | KeyPressMask;        // expose and key events
 232         events |= ButtonPressMask | ButtonReleaseMask | PointerMotionMask;      // mouse events
 233         XSelectInput(dpy, win, events);
 234
 235         // set WM cooperation settings
 236         Atom wm_delete = XInternAtom(dpy, "WM_DELETE_WINDOW", True);
 237         XSetWMProtocols(dpy, win, &wm_delete, 1);
 238
 239         XTextProperty tp_wname;
 240         static char *win_title = "3dengfx/X";
 241         XStringListToTextProperty(&win_title, 1, &tp_wname);
 242         XSetWMName(dpy, win, &tp_wname);
 243         XFree(tp_wname.value);
 244
 245         XClassHint class_hint;
 246         class_hint.res_name = "3dengfx";
 247         class_hint.res_class = "3dengfx_graphics";
 248         XSetClassHint(dpy, win, &class_hint);
 249
 250         XFree(vis_info);
 251
 252         if(glXMakeCurrent(dpy, win, glx_ctx) == False) {
 253                 error("%s: Failed to make the GLX context current", __func__);
 254                 glXDestroyContext(dpy, glx_ctx);
 255                 XDestroyWindow(dpy, win);
 256                 XCloseDisplay(dpy);
 257                 return false;
 258         }
 259
 260         if(!glXIsDirect(dpy, glx_ctx)) {
 261                 warning("using indirect rendering, which might be slow...");
 262         }
 263
 264         XMapWindow(dpy, win);
 265         XFlush(dpy);
 266
 267         fxwt_x_dpy = dpy;
 268         fxwt_x_win = win;
 269
 270         return true;
 271 }
 272
 273 void fxwt::destroy_graphics() {
 274         info("Shutting down GLX");
 275         glXDestroyContext(fxwt_x_dpy, glx_ctx);
 276         XDestroyWindow(fxwt_x_dpy, fxwt_x_win);
 277
 278 #ifdef USE_XF86VIDMODE
 279         if(fullscreen) {
 280                 XF86VidModeSwitchToMode(fxwt_x_dpy, DefaultScreen(fxwt_x_dpy), &orig_mode);
 281                 XF86VidModeSetViewPort(fxwt_x_dpy, DefaultScreen(fxwt_x_dpy), 0, 0);
 282         }
 283 #endif  // USE_XF86VIDMODE
 284
 285         XCloseDisplay(fxwt_x_dpy);
 286 }
 287
 288 #ifndef GLX_ARB_get_proc_address
 289 #include <dlfcn.h>
 290
 291 void *glXGetProcAddress(const char *name) {
 292         char *err_str;
 293         void *sym;
 294         void *so = dlopen("libGL.so", RTLD_LAZY);
 295         if(!so) {
 296                 perror("dlopen failed");
 297                 return 0;
 298         }
 299
 300         dlerror();
 301         sym = dlsym(so, name);
 302         if((err_str = dlerror())) {
 303                 fprintf(stderr, "dlsym failed: %s\n", err_str);
 304                 sym = 0;
 305         }
 306
 307         dlclose(so);
 308         return sym;
 309 }
 310 #endif
 311
 312 #endif  // GFX_LIBRARY == NATIVE && NATIVE_LIB == NATIVE_X11