source/main.c

   1 #define GL_GLEXT_PROTOTYPES
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <signal.h>
   6 #include <math.h>
   7 #include <X11/Xlib.h>
   8 #include <X11/Xatom.h>
   9 #include <X11/extensions/Xcomposite.h>
  10 #include <X11/extensions/Xdamage.h>
  11 #include <X11/extensions/shape.h>
  12 #include <X11/extensions/Xrandr.h>
  13 #include <GL/gl.h>
  14 #include <GL/glx.h>
  15
  16 typedef struct CompositedWindow
  17 {
  18         Window window;
  19         int x;
  20         int y;
  21         unsigned width;
  22         unsigned height;
  23         unsigned border;
  24         int map_state;
  25         Damage damage;
  26         Pixmap pixmap;
  27         GLXPixmap glx_pixmap;
  28         int recreate_pixmap;
  29         unsigned texture;
  30         unsigned mask_texture;
  31         int use_mask;
  32         int recreate_mask;
  33 } CompositedWindow;
  34
  35 typedef struct CompositedMonitor
  36 {
  37         char *name;
  38         int enabled;
  39         int x;
  40         int y;
  41         unsigned width;
  42         unsigned height;
  43         float keystone_vertical;
  44         float cylinder_depth;
  45         float vertical_center;
  46         float perspective;
  47         unsigned vertex_buffer;
  48         unsigned index_buffer;
  49         unsigned vertex_array;
  50         unsigned tessellation;
  51         unsigned nelements;
  52         short *geometry_data;
  53         unsigned geometry_data_size;
  54 } CompositedMonitor;
  55
  56 typedef struct CompositedScreen
  57 {
  58         int number;
  59         Window root;
  60         unsigned width;
  61         unsigned height;
  62         Window overlay;
  63         Window render_window;
  64         GLXFBConfig fbconfig;
  65         GLXWindow glx_window;
  66         GLXContext glx_context;
  67         unsigned shaders[3];
  68         unsigned program;
  69         int geometry_loc;
  70         unsigned masked_program;
  71         int masked_geometry_loc;
  72         unsigned window_vertex_buffer;
  73         unsigned window_vertex_array;
  74         unsigned framebuffer;
  75         unsigned fb_texture;
  76         Pixmap root_pixmap;
  77         GLXPixmap root_glx_pixmap;
  78         unsigned root_texture;
  79         CompositedWindow *windows;
  80         unsigned nwindows;
  81         unsigned windows_capacity;
  82         CompositedMonitor *monitors;
  83         unsigned nmonitors;
  84         int dirty;
  85 } CompositedScreen;
  86
  87 typedef struct Compositor
  88 {
  89         Display *display;
  90         CompositedScreen *screens;
  91         unsigned nscreens;
  92         int damage_event;
  93         int shape_event;
  94         PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB;
  95         PFNGLXBINDTEXIMAGEEXTPROC glXBindTexImageEXT;
  96         PFNGLXRELEASETEXIMAGEEXTPROC glXReleaseTexImageEXT;
  97         Atom root_pmap_atom;
  98         Atom correction_atom;
  99         Atom monitors_atom;
 100         Atom geometry_data_atom;
 101         Window selection_window;
 102         int dirty;
 103 } Compositor;
 104
 105 static const char *vshader_src =
 106         "#version 150\n"
 107         "uniform vec4 geometry;\n"
 108         "in vec2 vertex;\n"
 109         "in vec2 texture_coord;\n"
 110         "out vec2 texcoord;\n"
 111         "void main()\n"
 112         "{\n"
 113         "  gl_Position = vec4((geometry.xy+vertex*geometry.zw)*2.0-1.0, 0.0, 1.0);\n"
 114         "  texcoord = texture_coord;\n"
 115         "}\n";
 116
 117 static const char *fshader_src =
 118         "#version 150\n"
 119         "uniform sampler2D image;\n"
 120         "in vec2 texcoord;\n"
 121         "out vec4 frag_color;\n"
 122         "void main()\n"
 123         "{\n"
 124         "  frag_color = texture(image, texcoord);\n"
 125         "}\n";
 126
 127 static const char *masked_fshader_src =
 128         "#version 150\n"
 129         "uniform sampler2D image;\n"
 130         "uniform sampler2D mask;\n"
 131         "in vec2 texcoord;\n"
 132         "out vec4 frag_color;\n"
 133         "void main()\n"
 134         "{\n"
 135         "  if(texture(mask, texcoord).r==0.0)\n"
 136         "    discard;\n"
 137         "  frag_color = texture(image, texcoord);\n"
 138         "}\n";
 139
 140 static const float window_vertices[] =
 141 {
 142         /* vertex    texcoord */
 143         0.0f, 1.0f,  0.0f, 0.0f,
 144         0.0f, 0.0f,  0.0f, 1.0f,
 145         1.0f, 1.0f,  1.0f, 0.0f,
 146         1.0f, 0.0f,  1.0f, 1.0f
 147 };
 148
 149 int terminate_requested = 0;
 150
 151 int x_error_handler(Display *display, XErrorEvent *event)
 152 {
 153         printf("Ignoring X error %d on resource %lx\n", event->error_code, event->resourceid);
 154         (void)display;
 155         return 0;
 156 }
 157
 158 int with_error(const char *message)
 159 {
 160         fprintf(stderr, "%s\n", message);
 161         return 0;
 162 }
 163
 164 int initialize_gl(Compositor *compositor, CompositedScreen *screen)
 165 {
 166         int attribs[9];
 167         unsigned i;
 168         GLXFBConfig *configs;
 169         int nconfigs;
 170         XVisualInfo *vi;
 171         XSetWindowAttributes win_attr;
 172
 173         i = 0;
 174         attribs[i++] = GLX_DRAWABLE_TYPE;
 175         attribs[i++] = GLX_WINDOW_BIT;
 176         attribs[i++] = GLX_RENDER_TYPE;
 177         attribs[i++] = GLX_RGBA_BIT;
 178         attribs[i++] = GLX_DOUBLEBUFFER;
 179         attribs[i++] = True;
 180         attribs[i++] = GLX_BIND_TO_TEXTURE_RGBA_EXT;
 181         attribs[i++] = True;
 182         attribs[i] = None;
 183
 184         configs = glXChooseFBConfig(compositor->display, screen->number, attribs, &nconfigs);
 185         if(!configs || !nconfigs)
 186                 return with_error("Could not find a suitable FBConfig");
 187         screen->fbconfig = configs[0];
 188         XFree(configs);
 189
 190         vi = glXGetVisualFromFBConfig(compositor->display, screen->fbconfig);
 191         win_attr.colormap = XCreateColormap(compositor->display, screen->root, vi->visual, AllocNone);
 192         screen->render_window = XCreateWindow(compositor->display, screen->overlay, 0, 0, screen->width, screen->height, 0, vi->depth, InputOutput, vi->visual, CWColormap, &win_attr);
 193         XMapWindow(compositor->display, screen->render_window);
 194
 195         screen->glx_window = glXCreateWindow(compositor->display, screen->fbconfig, screen->render_window, NULL);
 196
 197         i = 0;
 198         attribs[i++] = GLX_CONTEXT_FLAGS_ARB;
 199         attribs[i++] = GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
 200         attribs[i++] = GLX_CONTEXT_MAJOR_VERSION_ARB;
 201         attribs[i++] = 3;
 202         attribs[i++] = GLX_CONTEXT_MINOR_VERSION_ARB;
 203         attribs[i++] = 1;
 204         attribs[i] = None;
 205
 206         screen->glx_context = compositor->glXCreateContextAttribsARB(compositor->display, screen->fbconfig, NULL, True, attribs);
 207
 208         XFree(vi);
 209
 210         return 1;
 211 }
 212
 213 void use_gl(Compositor *compositor, CompositedScreen *screen)
 214 {
 215         glXMakeContextCurrent(compositor->display, screen->glx_window, screen->glx_window, screen->glx_context);
 216 }
 217
 218 unsigned compile_shader(GLenum type, const char *source)
 219 {
 220         unsigned shader;
 221         int status;
 222         char info_log[1024];
 223         GLsizei length;
 224
 225         shader = glCreateShader(type);
 226         glShaderSource(shader, 1, &source, NULL);
 227         glCompileShader(shader);
 228         glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
 229         glGetShaderInfoLog(shader, sizeof(info_log), &length, info_log);
 230         if(!status)
 231         {
 232                 fprintf(stderr, "Shader compilation failed:\n%s\n", info_log);
 233                 glDeleteShader(shader);
 234                 return 0;
 235         }
 236         else if(length)
 237                 printf("Shader info log:\n%s\n", info_log);
 238
 239         return shader;
 240 }
 241
 242 unsigned link_program(unsigned vshader, unsigned fshader)
 243 {
 244         unsigned program;
 245         int status;
 246         char info_log[1024];
 247         GLsizei length;
 248
 249         program = glCreateProgram();
 250         glAttachShader(program, vshader);
 251         glAttachShader(program, fshader);
 252         glBindAttribLocation(program, 0, "vertex");
 253         glBindAttribLocation(program, 1, "texture_coord");
 254         glBindFragDataLocation(program, 0, "frag_color");
 255         glLinkProgram(program);
 256
 257         glGetProgramiv(program, GL_LINK_STATUS, &status);
 258         glGetProgramInfoLog(program, sizeof(info_log), &length, info_log);
 259         if(!status)
 260         {
 261                 fprintf(stderr, "Program link failed:\n%s\n", info_log);
 262                 glDeleteProgram(program);
 263                 return 0;
 264         }
 265         else if(length)
 266                 printf("Program info log:\n%s\n", info_log);
 267
 268         return program;
 269 }
 270
 271 unsigned create_2d_texture()
 272 {
 273         unsigned texture;
 274         glGenTextures(1, &texture);
 275         glBindTexture(GL_TEXTURE_2D, texture);
 276         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 277         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 278         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 279         return texture;
 280 }
 281
 282 int create_gl_resources(CompositedScreen *screen)
 283 {
 284         unsigned stride;
 285         int loc;
 286
 287         screen->shaders[0] = compile_shader(GL_VERTEX_SHADER, vshader_src);
 288         screen->shaders[1] = compile_shader(GL_FRAGMENT_SHADER, fshader_src);
 289         screen->shaders[2] = compile_shader(GL_FRAGMENT_SHADER, masked_fshader_src);
 290         if(!screen->shaders[0] || !screen->shaders[1] || !screen->shaders[2])
 291                 return 0;
 292
 293         screen->program = link_program(screen->shaders[0], screen->shaders[1]);
 294         if(!screen->program)
 295                 return 0;
 296
 297         screen->masked_program = link_program(screen->shaders[0], screen->shaders[2]);
 298         if(!screen->masked_program)
 299                 return 0;
 300
 301         screen->geometry_loc = glGetUniformLocation(screen->program, "geometry");
 302         screen->masked_geometry_loc = glGetUniformLocation(screen->masked_program, "geometry");
 303
 304         loc = glGetUniformLocation(screen->masked_program, "mask");
 305         if(loc>=0)
 306         {
 307                 glUseProgram(screen->masked_program);
 308                 glUniform1i(loc, 1);
 309         }
 310
 311         glGenBuffers(1, &screen->window_vertex_buffer);
 312         glBindBuffer(GL_ARRAY_BUFFER, screen->window_vertex_buffer);
 313         glBufferData(GL_ARRAY_BUFFER, sizeof(window_vertices), window_vertices, GL_STATIC_DRAW);
 314
 315         stride = 4*sizeof(float);
 316         glGenVertexArrays(1, &screen->window_vertex_array);
 317         glBindVertexArray(screen->window_vertex_array);
 318         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, NULL);
 319         glEnableVertexAttribArray(0);
 320         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void *)(2*sizeof(float)));
 321         glEnableVertexAttribArray(1);
 322         glBindVertexArray(0);
 323
 324         glBindBuffer(GL_ARRAY_BUFFER, 0);
 325
 326         screen->fb_texture = create_2d_texture();
 327         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, screen->width, screen->height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
 328         glBindTexture(GL_TEXTURE_2D, 0);
 329
 330         glGenFramebuffers(1, &screen->framebuffer);
 331         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, screen->framebuffer);
 332         glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, screen->fb_texture, 0);
 333         glDepthMask(GL_FALSE);
 334         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 335
 336         screen->root_texture = create_2d_texture();
 337
 338         return 1;
 339 }
 340
 341 CompositedWindow *find_window(CompositedScreen *screen, Window w)
 342 {
 343         unsigned i;
 344
 345         for(i=0; i<screen->nwindows; ++i)
 346                 if(screen->windows[i].window==w)
 347                         return &screen->windows[i];
 348
 349         return NULL;
 350 }
 351
 352 CompositedWindow *find_window_global(Compositor *compositor, Window w, CompositedScreen **screen)
 353 {
 354         unsigned i, j;
 355
 356         for(i=0; i<compositor->nscreens; ++i)
 357                 for(j=0; j<compositor->screens[i].nwindows; ++j)
 358                         if(compositor->screens[i].windows[j].window==w)
 359                         {
 360                                 if(screen)
 361                                         *screen = &compositor->screens[i];
 362                                 return &compositor->screens[i].windows[j];
 363                         }
 364
 365         if(screen)
 366                 *screen = NULL;
 367         return NULL;
 368 }
 369
 370 GLXPixmap pixmap_to_glx_pixmap(Compositor *compositor, CompositedScreen *screen, Pixmap pixmap)
 371 {
 372         int attribs[5];
 373         unsigned i;
 374
 375         i = 0;
 376         attribs[i++] = GLX_TEXTURE_TARGET_EXT;
 377         attribs[i++] = GLX_TEXTURE_2D_EXT;
 378         attribs[i++] = GLX_TEXTURE_FORMAT_EXT;
 379         attribs[i++] = GLX_TEXTURE_FORMAT_RGBA_EXT;
 380         attribs[i++] = None;
 381
 382         return glXCreatePixmap(compositor->display, screen->fbconfig, pixmap, attribs);
 383 }
 384
 385 void create_window_pixmap(Compositor *compositor, CompositedScreen *screen, CompositedWindow *window)
 386 {
 387         if(window->pixmap)
 388         {
 389                 glXDestroyPixmap(compositor->display, window->glx_pixmap);
 390                 XFreePixmap(compositor->display, window->pixmap);
 391         }
 392
 393         window->pixmap = XCompositeNameWindowPixmap(compositor->display, window->window);
 394         window->glx_pixmap = pixmap_to_glx_pixmap(compositor, screen, window->pixmap);
 395         window->recreate_pixmap = 0;
 396 }
 397
 398 void update_window_mask(Compositor *compositor, CompositedWindow *window)
 399 {
 400         Bool bounding_shaped;
 401         Bool clip_shaped;
 402         int xi, yi;
 403         XRectangle *rects;
 404         int rect_count;
 405         int rect_order;
 406         unsigned width;
 407         unsigned height;
 408         unsigned char *data;
 409         int i;
 410         unsigned y;
 411
 412         XShapeQueryExtents(compositor->display, window->window, &bounding_shaped, &xi, &yi, &width, &height, &clip_shaped, &xi, &yi, &width, &height);
 413         window->use_mask = bounding_shaped;
 414         if(!window->use_mask)
 415                 return;
 416
 417         rects = XShapeGetRectangles(compositor->display, window->window, ShapeBounding, &rect_count, &rect_order);
 418
 419         width = window->width+2*window->border;
 420         height = window->height+2*window->border;
 421         data = (unsigned char *)malloc(width*height);
 422         memset(data, 0, width*height);
 423         for(i=0; i<rect_count; ++i)
 424         {
 425                 rects[i].x += window->border;
 426                 rects[i].y += window->border;
 427                 if(rects[i].x>=(int)width || rects[i].y>=(int)height)
 428                         continue;
 429
 430                 if(rects[i].x<0)
 431                 {
 432                         if(-rects[i].x>rects[i].width)
 433                                 continue;
 434                         rects[i].width += rects[i].x;
 435                         rects[i].x = 0;
 436                 }
 437
 438                 if(rects[i].y<0)
 439                 {
 440                         if(-rects[i].y>rects[i].height)
 441                                 continue;
 442                         rects[i].height += rects[i].y;
 443                         rects[i].y = 0;
 444                 }
 445
 446                 if(rects[i].x+rects[i].width>(int)width)
 447                         rects[i].width = width-rects[i].x;
 448                 if(rects[i].y+rects[i].height>(int)height)
 449                         rects[i].height = height-rects[i].y;
 450
 451                 for(y=0; y<rects[i].height; ++y)
 452                 {
 453                         unsigned char *row = data+(rects[i].y+y)*width+rects[i].x;
 454                         memset(row, 255, rects[i].width);
 455                 }
 456         }
 457
 458         XFree(rects);
 459
 460         glBindTexture(GL_TEXTURE_2D, window->mask_texture);
 461         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 462         glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, data);
 463
 464         free(data);
 465
 466         window->recreate_mask = 0;
 467 }
 468
 469 CompositedWindow *add_window(Compositor *compositor, CompositedScreen *screen, Window w)
 470 {
 471         CompositedWindow *window;
 472         XWindowAttributes win_attr;
 473
 474         if(w==screen->root || w==screen->overlay)
 475                 return NULL;
 476
 477         if(!XGetWindowAttributes(compositor->display, w, &win_attr))
 478         {
 479                 printf("XGetWindowAttributes failed; probably the window was already destroyed\n");
 480                 return NULL;
 481         }
 482         if(win_attr.class==InputOnly)
 483                 return NULL;
 484
 485         if(find_window(screen, w))
 486                 return NULL;
 487
 488         if(screen->nwindows==screen->windows_capacity)
 489         {
 490                 screen->windows = (CompositedWindow *)realloc(screen->windows, (screen->windows_capacity+1)*sizeof(CompositedWindow));
 491                 ++screen->windows_capacity;
 492         }
 493
 494         window = &screen->windows[screen->nwindows++];
 495
 496         window->window = w;
 497         window->x = win_attr.x;
 498         window->y = win_attr.y;
 499         window->width = win_attr.width;
 500         window->height = win_attr.height;
 501         window->border = win_attr.border_width;
 502         window->map_state = win_attr.map_state;
 503
 504         window->damage = XDamageCreate(compositor->display, window->window, XDamageReportNonEmpty);
 505         window->pixmap = None;
 506         window->glx_pixmap = None;
 507
 508         XCompositeRedirectWindow(compositor->display, window->window, CompositeRedirectManual);
 509         window->recreate_pixmap = (window->map_state==IsViewable);
 510
 511         window->texture = create_2d_texture();
 512         window->mask_texture = create_2d_texture();
 513         window->use_mask = 0;
 514         window->recreate_mask = (window->map_state==IsViewable);
 515
 516         XShapeSelectInput(compositor->display, window->window, ShapeNotifyMask);
 517
 518         return window;
 519 }
 520
 521 void remove_window(Compositor *compositor, CompositedScreen *screen, CompositedWindow *window, int destroyed)
 522 {
 523         unsigned i;
 524
 525         glDeleteTextures(1, &window->texture);
 526         if(!destroyed)
 527         {
 528                 XDamageDestroy(compositor->display, window->damage);
 529                 if(window->pixmap)
 530                 {
 531                         glXDestroyPixmap(compositor->display, window->glx_pixmap);
 532                         XFreePixmap(compositor->display, window->pixmap);
 533                 }
 534                 XCompositeUnredirectWindow(compositor->display, window->window, CompositeRedirectManual);
 535         }
 536
 537         --screen->nwindows;
 538         for(i=window-screen->windows; i<screen->nwindows; ++i)
 539                 screen->windows[i] = screen->windows[i+1];
 540 }
 541
 542 CompositedWindow *reorder_window(CompositedScreen *screen, CompositedWindow *window, Window above)
 543 {
 544         unsigned i, j;
 545         CompositedWindow hold;
 546
 547         i = window-screen->windows;
 548         if(above)
 549         {
 550                 for(j=0; j<screen->nwindows; ++j)
 551                         if(screen->windows[j].window==above)
 552                                 break;
 553
 554                 if(j>=screen->nwindows || i==j+1)
 555                         return window;
 556
 557                 if(j<i)
 558                         ++j;
 559         }
 560         else
 561                 j = 0;
 562
 563         hold = *window;
 564         if(i<j)
 565         {
 566                 for(; i<j; ++i)
 567                         screen->windows[i] = screen->windows[i+1];
 568         }
 569         else
 570         {
 571                 for(; i>j; --i)
 572                         screen->windows[i] = screen->windows[i-1];
 573         }
 574         screen->windows[j] = hold;
 575
 576         return &screen->windows[j];
 577 }
 578
 579 CompositedScreen *find_screen_by_root(Compositor *compositor, Window root)
 580 {
 581         unsigned i;
 582
 583         for(i=0; i<compositor->nscreens; ++i)
 584                 if(compositor->screens[i].root==root)
 585                         return &compositor->screens[i];
 586
 587         return NULL;
 588 }
 589
 590 void update_monitor_vertices(CompositedScreen *screen, CompositedMonitor *monitor)
 591 {
 592         unsigned t;
 593         unsigned data_size;
 594         float *vertex_data;
 595         unsigned short *index_data;
 596         unsigned x, y;
 597         unsigned i;
 598         float aspect;
 599         float cyl_radius;
 600         float cyl_arc;
 601         float sin_ksv;
 602         float cos_ksv;
 603         float distance;
 604         float eye[3];
 605         float look[3];
 606
 607         t = monitor->tessellation;
 608
 609         data_size = (t+1)*(t+1)*4*sizeof(float);
 610         vertex_data = (float *)malloc(data_size);
 611
 612         aspect = (float)monitor->width/monitor->height;
 613
 614         if(monitor->cylinder_depth)
 615         {
 616                 cyl_radius = (monitor->cylinder_depth*monitor->cylinder_depth+0.25f)/(2.0f*monitor->cylinder_depth);
 617                 cyl_arc = 2.0f*asin(0.5f/cyl_radius);
 618         }
 619
 620         sin_ksv = monitor->keystone_vertical/sqrt(1.0f+monitor->keystone_vertical*monitor->keystone_vertical);
 621         cos_ksv = sqrt(1.0f-sin_ksv*sin_ksv);
 622         distance = monitor->perspective+sin_ksv*((sin_ksv>0)-monitor->vertical_center)/aspect;
 623
 624         eye[0] = 0.0f;
 625         eye[1] = (monitor->vertical_center-0.5f)/aspect+sin_ksv*distance;
 626         eye[2] = cos_ksv*distance;
 627
 628         look[0] = 0.0f;
 629         look[1] = -sin_ksv;
 630         look[2] = -cos_ksv;
 631
 632         for(y=0; y<=t; ++y)
 633                 for(x=0; x<=t; ++x)
 634                 {
 635                         float *v;
 636
 637                         v = vertex_data+(y*(t+1)+x)*3;
 638                         v[0] = (float)x/t-0.5f;
 639                         v[1] = ((float)y/t-0.5f)/aspect;
 640                         v[2] = 0;
 641                         if(monitor->cylinder_depth)
 642                         {
 643                                 v[2] = (1.0f-cos(v[0]*cyl_arc))*cyl_radius-monitor->cylinder_depth;
 644                                 v[0] = sin(v[0]*cyl_arc)*cyl_radius;
 645                         }
 646                 }
 647
 648         monitor->geometry_data[0] = t;
 649         for(i=0; i<3; ++i)
 650                 monitor->geometry_data[1+i] = eye[i]*10000;
 651         for(y=0; y<2; ++y)
 652                 for(x=0; x<2; ++x)
 653                 {
 654                         i = 1+(1+y*2+x)*3;
 655                         monitor->geometry_data[i] = ((x-0.5f)*distance/monitor->perspective)*10000;
 656                         monitor->geometry_data[i+1] = (eye[1]+look[1]*distance-(y-0.5f)*look[2]*distance/monitor->perspective/aspect)*10000;
 657                         monitor->geometry_data[i+2] = (eye[2]+look[2]*distance+(y-0.5f)*look[1]*distance/monitor->perspective/aspect)*10000;
 658                 }
 659         for(i=0; i<(t+1)*(t+1)*3; ++i)
 660                 monitor->geometry_data[16+i] = vertex_data[i]*10000;
 661
 662         for(y=t; y<=t; --y)
 663                 for(x=t; x<=t; --x)
 664                 {
 665                         float *v;
 666                         float px, py, pz;
 667                         float scale;
 668
 669                         v = vertex_data+(y*(t+1)+x)*3;
 670                         px = v[0]-eye[0];
 671                         py = (v[0]-eye[0])*look[0] - (v[1]-eye[1])*look[2] + (v[2]-eye[2])*look[1];
 672                         pz = (v[0]-eye[0])*look[0] + (v[1]-eye[1])*look[1] + (v[2]-eye[2])*look[2];
 673                         scale = monitor->perspective/pz;
 674
 675                         v = vertex_data+(y*(t+1)+x)*4;
 676                         v[0] = px*scale+0.5f;
 677                         v[1] = py*aspect*scale+monitor->vertical_center;
 678                         v[2] = (monitor->x+(float)x*monitor->width/t)/screen->width;
 679                         v[3] = 1.0f-(monitor->y+(1.0f-(float)y/t)*monitor->height)/screen->height;
 680                 }
 681
 682         glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
 683         glBufferData(GL_ARRAY_BUFFER, data_size, vertex_data, GL_STATIC_DRAW);
 684         glBindBuffer(GL_ARRAY_BUFFER, 0);
 685         free(vertex_data);
 686
 687         monitor->nelements = t*((t+1)*2+1)-1;
 688         data_size = monitor->nelements*sizeof(unsigned short);
 689         index_data = (unsigned short *)malloc(data_size);
 690         i = 0;
 691         for(y=0; y<t; ++y)
 692         {
 693                 if(y>0)
 694                         index_data[i++] = 0xFFFF;
 695                 for(x=0; x<=t; ++x)
 696                 {
 697                         index_data[i++] = (y+1)*(t+1)+x;
 698                         index_data[i++] = y*(t+1)+x;
 699                 }
 700         }
 701         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
 702         glBufferData(GL_ELEMENT_ARRAY_BUFFER, data_size, index_data, GL_STATIC_DRAW);
 703         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 704         free(index_data);
 705 }
 706
 707 int initialize_monitor(Compositor *compositor, CompositedScreen *screen, XRRScreenResources *xrr_res, unsigned index)
 708 {
 709         CompositedMonitor *monitor;
 710         XRROutputInfo *output;
 711         int namelen;
 712         XRRCrtcInfo *crtc;
 713         unsigned buffers[2];
 714         unsigned stride;
 715
 716         monitor = &screen->monitors[index];
 717
 718         output = XRRGetOutputInfo(compositor->display, xrr_res, xrr_res->outputs[index]);
 719         namelen = strlen(output->name);
 720         monitor->name = (char *)malloc(namelen+1);
 721         strcpy(monitor->name, output->name);
 722         monitor->enabled = !!output->crtc;
 723         if(!monitor->enabled)
 724         {
 725                 XRRFreeOutputInfo(output);
 726                 monitor->geometry_data = NULL;
 727                 return 1;
 728         }
 729
 730         crtc = XRRGetCrtcInfo(compositor->display, xrr_res, output->crtc);
 731         monitor->x = crtc->x;
 732         monitor->y = crtc->y;
 733         monitor->width = crtc->width;
 734         monitor->height = crtc->height;
 735         XRRFreeCrtcInfo(crtc);
 736         XRRFreeOutputInfo(output);
 737
 738         monitor->keystone_vertical = 0.0f;
 739         monitor->cylinder_depth = 0.0f;
 740         monitor->vertical_center = 0.5f;
 741         monitor->perspective = 1.0f;
 742
 743         glGenBuffers(2, buffers);
 744         monitor->vertex_buffer = buffers[0];
 745         monitor->index_buffer = buffers[1];
 746
 747         monitor->tessellation = 50;
 748         monitor->geometry_data_size = (monitor->tessellation+1)*(monitor->tessellation+1)*3+16;
 749         monitor->geometry_data = (short *)malloc(monitor->geometry_data_size*sizeof(short));
 750         update_monitor_vertices(screen, monitor);
 751         stride = 4*sizeof(float);
 752
 753         glGenVertexArrays(1, &monitor->vertex_array);
 754         glBindVertexArray(monitor->vertex_array);
 755         glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
 756         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, NULL);
 757         glEnableVertexAttribArray(0);
 758         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void *)(2*sizeof(float)));
 759         glEnableVertexAttribArray(1);
 760         glBindBuffer(GL_ARRAY_BUFFER, 0);
 761         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
 762         glBindVertexArray(0);
 763
 764         return 1;
 765 }
 766
 767 CompositedMonitor *find_monitor_by_name(CompositedScreen *screen, char *name)
 768 {
 769         unsigned i;
 770
 771         for(i=0; i<screen->nmonitors; ++i)
 772                 if(!strcmp(screen->monitors[i].name, name))
 773                         return &screen->monitors[i];
 774
 775         return NULL;
 776 }
 777
 778 CompositedMonitor *find_monitor_by_name_global(Compositor *compositor, char *name, CompositedScreen **screen)
 779 {
 780         unsigned i, j;
 781
 782         for(i=0; i<compositor->nscreens; ++i)
 783                 for(j=0; j<compositor->screens[i].nmonitors; ++j)
 784                         if(!strcmp(compositor->screens[i].monitors[j].name, name))
 785                         {
 786                                 if(screen)
 787                                         *screen = &compositor->screens[i];
 788                                 return &compositor->screens[i].monitors[j];
 789                         }
 790
 791         if(screen)
 792                 *screen = NULL;
 793         return NULL;
 794 }
 795
 796 void update_geometry_correction(Compositor *compositor, CompositedScreen *screen)
 797 {
 798         Atom prop_type;
 799         int prop_format;
 800         unsigned long overflow;
 801         unsigned long names_length;
 802         char *names;
 803         unsigned long values_length;
 804         short *values;
 805         char *name_ptr;
 806         unsigned i;
 807
 808         XGetWindowProperty(compositor->display, screen->root, compositor->monitors_atom, 0, 64, False, XA_STRING,
 809                 &prop_type, &prop_format, &names_length, &overflow, (unsigned char **)&names);
 810         if(prop_type!=XA_STRING || prop_format!=8)
 811                 return;
 812
 813         XGetWindowProperty(compositor->display, screen->root, compositor->correction_atom, 0, 64, False, XA_INTEGER,
 814                 &prop_type, &prop_format, &values_length, &overflow, (unsigned char **)&values);
 815         if(prop_type!=XA_INTEGER || prop_format!=16)
 816         {
 817                 XFree(names);
 818                 return;
 819         }
 820
 821         use_gl(compositor, screen);
 822
 823         name_ptr = names;
 824         for(i=0; i*4<values_length; ++i)
 825         {
 826                 CompositedMonitor *monitor;
 827
 828                 if(name_ptr>=names+names_length)
 829                         break;
 830
 831                 monitor = find_monitor_by_name(screen, name_ptr);
 832                 if(monitor)
 833                 {
 834                         monitor->keystone_vertical = values[i*4]/10000.0f;
 835                         monitor->cylinder_depth = values[i*4+1]/10000.0f;
 836                         monitor->vertical_center = values[i*4+2]/10000.0f;
 837                         monitor->perspective = values[i*4+3]/10000.0f;
 838
 839                         if(monitor->enabled)
 840                                 update_monitor_vertices(screen, monitor);
 841                 }
 842
 843                 name_ptr += strlen(name_ptr)+1;
 844         }
 845
 846         XFree(names);
 847         XFree(values);
 848 }
 849
 850 void update_root_pixmap(Compositor *compositor, CompositedScreen *screen)
 851 {
 852         Atom prop_type;
 853         int prop_format;
 854         unsigned long overflow;
 855         unsigned long length;
 856         long *pixmap;
 857         Window root;
 858         int x, y;
 859         unsigned width;
 860         unsigned height;
 861         unsigned border;
 862         unsigned depth;
 863
 864         use_gl(compositor, screen);
 865
 866         if(screen->root_glx_pixmap)
 867         {
 868                 glXDestroyPixmap(compositor->display, screen->root_glx_pixmap);
 869                 screen->root_glx_pixmap = None;
 870         }
 871
 872         XGetWindowProperty(compositor->display, screen->root, compositor->root_pmap_atom, 0, 1, False, XA_PIXMAP,
 873                 &prop_type, &prop_format, &length, &overflow, (unsigned char **)&pixmap);
 874         if(prop_type!=XA_PIXMAP || prop_format!=32)
 875         {
 876                 screen->root_pixmap = None;
 877                 return;
 878         }
 879
 880         screen->root_pixmap = pixmap[0];
 881         if(XGetGeometry(compositor->display, screen->root_pixmap, &root, &x, &y, &width, &height, &border, &depth))
 882                 screen->root_glx_pixmap = pixmap_to_glx_pixmap(compositor, screen, screen->root_pixmap);
 883         else
 884                 screen->root_pixmap = None;
 885
 886         XFree(pixmap);
 887 }
 888
 889 int initialize_screen(Compositor *compositor, unsigned number)
 890 {
 891         CompositedScreen *screen;
 892         const char *extensions;
 893         Window dummy_root;
 894         int x, y;
 895         unsigned border;
 896         unsigned depth;
 897         XRRScreenResources *xrr_res;
 898         Window dummy_parent;
 899         Window *children;
 900         unsigned nchildren;
 901         unsigned i;
 902
 903         screen = &compositor->screens[number];
 904         screen->number = number;
 905
 906         extensions = glXQueryExtensionsString(compositor->display, screen->number);
 907         if(!strstr(extensions, "GLX_ARB_create_context"))
 908                 return with_error("GLX_ARB_create_context is required");
 909         if(!strstr(extensions, "GLX_EXT_texture_from_pixmap"))
 910                 return with_error("GLX_EXT_texture_from_pixmap is required");
 911
 912         screen->root = RootWindow(compositor->display, screen->number);
 913         XSelectInput(compositor->display, screen->root, SubstructureNotifyMask|PropertyChangeMask);
 914         screen->overlay = XCompositeGetOverlayWindow(compositor->display, screen->root);
 915         XGetGeometry(compositor->display, screen->overlay, &dummy_root, &x, &y, &screen->width, &screen->height, &border, &depth);
 916         XShapeCombineRectangles(compositor->display, screen->overlay, ShapeInput, 0, 0, NULL, 0, ShapeSet, Unsorted);
 917
 918         if(!initialize_gl(compositor, screen))
 919                 return 0;
 920
 921         use_gl(compositor, screen);
 922
 923         if(!create_gl_resources(screen))
 924                 return 0;
 925
 926         xrr_res = XRRGetScreenResources(compositor->display, screen->root);
 927         screen->nmonitors = xrr_res->noutput;
 928         screen->monitors = (CompositedMonitor *)malloc(screen->nmonitors*sizeof(CompositedMonitor));
 929         for(i=0; i<screen->nmonitors; ++i)
 930                 if(!initialize_monitor(compositor, screen, xrr_res, i))
 931                         return 0;
 932         XRRFreeScreenResources(xrr_res);
 933
 934         screen->root_pixmap = None;
 935         screen->root_glx_pixmap = None;
 936
 937         update_geometry_correction(compositor, screen);
 938         update_root_pixmap(compositor, screen);
 939
 940         XQueryTree(compositor->display, screen->root, &dummy_root, &dummy_parent, &children, &nchildren);
 941
 942         screen->windows = (CompositedWindow *)malloc(nchildren*sizeof(CompositedWindow));
 943         screen->nwindows = 0;
 944         screen->windows_capacity = nchildren;
 945
 946         for(i=0; i<nchildren; ++i)
 947                 add_window(compositor, screen, children[i]);
 948
 949         XFree(children);
 950
 951         screen->dirty = 1;
 952
 953         return 1;
 954 }
 955
 956 int initialize_compositor(Compositor *compositor)
 957 {
 958         int event_base;
 959         int error_base;
 960         int major_ver;
 961         int minor_ver;
 962         unsigned i;
 963
 964         compositor->display = XOpenDisplay(NULL);
 965         if(!compositor->display)
 966                 return with_error("Could not open X display");
 967
 968         XSetErrorHandler(&x_error_handler);
 969
 970         if(!XCompositeQueryExtension(compositor->display, &event_base, &error_base))
 971                 return with_error("XComposite is required but was not found");
 972         else if(!XCompositeQueryVersion(compositor->display, &major_ver, &minor_ver))
 973                 return with_error("Cannot determine XComposite version");
 974         else if(major_ver==0 && minor_ver<3)
 975                 return with_error("XComposite 0.3 or later is required");
 976
 977         if(!glXQueryExtension(compositor->display, &event_base, &error_base))
 978                 return with_error("GLX is required but was not found");
 979         else if(!glXQueryVersion(compositor->display, &major_ver, &minor_ver))
 980                 return with_error("Cannot determine GLX version");
 981         else if(major_ver<1 || (major_ver==1 && minor_ver<4))
 982                 return with_error("GLX 1.4 or later is required");
 983
 984         if(!XDamageQueryExtension(compositor->display, &compositor->damage_event, &error_base))
 985                 return with_error("XDamage is required but was not found");
 986         else if(!XDamageQueryVersion(compositor->display, &major_ver, &minor_ver))
 987                 return with_error("Cannot determine XDamage version");
 988         else if(major_ver<1)
 989                 return with_error("XDamage 1.0 or later is required");
 990
 991         if(!XShapeQueryExtension(compositor->display, &compositor->shape_event, &error_base))
 992                 return with_error("XShape is required but was not found");
 993         else if(!XShapeQueryVersion(compositor->display, &major_ver, &minor_ver))
 994                 return with_error("Cannot determine XShape version");
 995         else if(major_ver<1 || (major_ver==1 && minor_ver<1))
 996                 return with_error("XShape 1.1 or later is required");
 997
 998         if(!XRRQueryExtension(compositor->display, &event_base, &error_base))
 999                 return with_error("XRandR is required but was not found");
1000         else if(!XRRQueryVersion(compositor->display, &major_ver, &minor_ver))
1001                 return with_error("Cannot determine XRandR version");
1002         else if(major_ver<1 || (major_ver==1 && minor_ver<2))
1003                 return with_error("XRandR 1.2 or later is required");
1004
1005         compositor->glXCreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)glXGetProcAddress((unsigned char *)"glXCreateContextAttribsARB");
1006         compositor->glXBindTexImageEXT = (PFNGLXBINDTEXIMAGEEXTPROC)glXGetProcAddress((unsigned char *)"glXBindTexImageEXT");
1007         compositor->glXReleaseTexImageEXT = (PFNGLXRELEASETEXIMAGEEXTPROC)glXGetProcAddress((unsigned char *)"glXReleaseTexImageEXT");
1008
1009         compositor->root_pmap_atom = XInternAtom(compositor->display, "_XROOTPMAP_ID", False);
1010         compositor->correction_atom = XInternAtom(compositor->display, "_MSP_GEOMETRY_CORRECTION", False);
1011         compositor->monitors_atom = XInternAtom(compositor->display, "_MSP_GEOMETRY_CORRECTION_MONITORS", False);
1012         compositor->geometry_data_atom = XInternAtom(compositor->display, "_MSP_GEOMETRY_CORRECTION_DATA", False);
1013
1014         compositor->nscreens = ScreenCount(compositor->display);
1015         compositor->screens = (CompositedScreen *)malloc(compositor->nscreens*sizeof(CompositedScreen));
1016         for(i=0; i<compositor->nscreens; ++i)
1017                 if(!initialize_screen(compositor, i))
1018                         return 0;
1019
1020         compositor->selection_window = XCreateWindow(compositor->display, compositor->screens[0].root, 0, 0, 1, 1, 0, CopyFromParent, InputOutput, CopyFromParent, 0, NULL);
1021         XSetSelectionOwner(compositor->display, compositor->geometry_data_atom, compositor->selection_window, CurrentTime);
1022
1023         compositor->dirty = 1;
1024
1025         return 1;
1026 }
1027
1028 void shutdown_screen(Compositor *compositor, CompositedScreen *screen)
1029 {
1030         unsigned i;
1031
1032         use_gl(compositor, screen);
1033
1034         for(i=0; i<screen->nwindows; ++i)
1035         {
1036                 glDeleteTextures(1, &screen->windows[i].texture);
1037                 glDeleteTextures(1, &screen->windows[i].mask_texture);
1038                 if(screen->windows[i].pixmap)
1039                 {
1040                         glXDestroyPixmap(compositor->display, screen->windows[i].glx_pixmap);
1041                         XFreePixmap(compositor->display, screen->windows[i].pixmap);
1042                         XDamageDestroy(compositor->display, screen->windows[i].damage);
1043                 }
1044         }
1045
1046         for(i=0; i<screen->nmonitors; ++i)
1047         {
1048                 free(screen->monitors[i].name);
1049                 if(screen->monitors[i].enabled)
1050                 {
1051                         glDeleteBuffers(1, &screen->monitors[i].vertex_buffer);
1052                         glDeleteBuffers(1, &screen->monitors[i].index_buffer);
1053                         glDeleteVertexArrays(1, &screen->monitors[i].vertex_array);
1054                 }
1055                 if(screen->monitors[i].geometry_data)
1056                         free(screen->monitors[i].geometry_data);
1057         }
1058
1059         glDeleteTextures(1, &screen->root_texture);
1060         glXDestroyPixmap(compositor->display, screen->root_glx_pixmap);
1061
1062         glDeleteBuffers(1, &screen->window_vertex_buffer);
1063         glDeleteVertexArrays(1, &screen->window_vertex_array);
1064         glDeleteFramebuffers(1, &screen->framebuffer);
1065         glDeleteTextures(1, &screen->fb_texture);
1066         glDeleteProgram(screen->program);
1067         glDeleteProgram(screen->masked_program);
1068         for(i=0; i<3; ++i)
1069                 glDeleteShader(screen->shaders[i]);
1070
1071         glXMakeContextCurrent(compositor->display, None, None, NULL);
1072         glXDestroyContext(compositor->display, screen->glx_context);
1073         glXDestroyWindow(compositor->display, screen->glx_window);
1074         XDestroyWindow(compositor->display, screen->render_window);
1075
1076         XCompositeReleaseOverlayWindow(compositor->display, screen->overlay);
1077
1078         free(screen->windows);
1079         free(screen->monitors);
1080 }
1081
1082 void shutdown_compositor(Compositor *compositor)
1083 {
1084         unsigned i;
1085
1086         for(i=0; i<compositor->nscreens; ++i)
1087                 shutdown_screen(compositor, &compositor->screens[i]);
1088         free(compositor->screens);
1089
1090         XDestroyWindow(compositor->display, compositor->selection_window);
1091
1092         XCloseDisplay(compositor->display);
1093 }
1094
1095 void mark_dirty(Compositor *compositor, CompositedScreen *screen)
1096 {
1097         compositor->dirty = 1;
1098         screen->dirty = 1;
1099 }
1100
1101 void process_create_window_event(Compositor *compositor, XCreateWindowEvent *event)
1102 {
1103         CompositedScreen *screen;
1104
1105         if((screen = find_screen_by_root(compositor, event->parent)))
1106                 add_window(compositor, screen, event->window);
1107 }
1108
1109 void process_destroy_window_event(Compositor *compositor, XDestroyWindowEvent *event)
1110 {
1111         CompositedScreen *screen;
1112         CompositedWindow *window;
1113
1114         if((screen = find_screen_by_root(compositor, event->event)))
1115                 if((window = find_window(screen, event->window)))
1116                 {
1117                         use_gl(compositor, screen);
1118                         remove_window(compositor, screen, window, 1);
1119                 }
1120 }
1121
1122 void process_map_event(Compositor *compositor, XMapEvent *event)
1123 {
1124         CompositedScreen *screen;
1125         CompositedWindow *window;
1126
1127         screen = find_screen_by_root(compositor, event->event);
1128         if(!screen)
1129                 return;
1130
1131         window = find_window(screen, event->window);
1132         if(!window)
1133                 return;
1134
1135         window->map_state = IsViewable;
1136         window->recreate_pixmap = 1;
1137         window->recreate_mask = 1;
1138
1139         mark_dirty(compositor, screen);
1140 }
1141
1142 void process_unmap_event(Compositor *compositor, XUnmapEvent *event)
1143 {
1144         CompositedScreen *screen;
1145         CompositedWindow *window;
1146
1147         screen = find_screen_by_root(compositor, event->event);
1148         if(!screen)
1149                 return;
1150
1151         window = find_window(screen, event->window);
1152         if(window)
1153                 window->map_state = IsUnviewable;
1154
1155         mark_dirty(compositor, screen);
1156 }
1157
1158 void process_reparent_event(Compositor *compositor, XReparentEvent *event)
1159 {
1160         CompositedScreen *screen;
1161         CompositedWindow *window;
1162
1163         screen = find_screen_by_root(compositor, event->event);
1164         if(!screen)
1165                 return;
1166
1167         if(event->parent==screen->root)
1168                 window = add_window(compositor, screen, event->window);
1169         else
1170         {
1171                 window = find_window(screen, event->window);
1172                 if(!window)
1173                         return;
1174
1175                 remove_window(compositor, screen, window, 0);
1176         }
1177
1178         if(window && window->map_state==IsViewable)
1179                 mark_dirty(compositor, screen);
1180 }
1181
1182 void process_configure_event(Compositor *compositor, XConfigureEvent *event)
1183 {
1184         CompositedScreen *screen;
1185         CompositedWindow *window;
1186
1187         screen = find_screen_by_root(compositor, event->event);
1188         if(!screen)
1189                 return;
1190
1191         window = find_window(screen, event->window);
1192         if(!window)
1193                 return;
1194
1195         window->x = event->x;
1196         window->y = event->y;
1197         if((unsigned)event->width!=window->width || (unsigned)event->height!=window->height || (unsigned)event->border_width!=window->border)
1198         {
1199                 window->width = event->width;
1200                 window->height = event->height;
1201                 window->border = event->border_width;
1202                 window->recreate_pixmap = 1;
1203         }
1204         reorder_window(screen, window, event->above);
1205
1206         if(window->map_state==IsViewable)
1207                 mark_dirty(compositor, screen);
1208 }
1209
1210 void process_property_event(Compositor *compositor, XPropertyEvent *event)
1211 {
1212         CompositedScreen *screen;
1213
1214         screen = find_screen_by_root(compositor, event->window);
1215         if(!screen)
1216                 return;
1217
1218         if(event->atom==compositor->correction_atom)
1219                 update_geometry_correction(compositor, screen);
1220         else if(event->atom==compositor->root_pmap_atom)
1221                 update_root_pixmap(compositor, screen);
1222 }
1223
1224 void process_selection_request_event(Compositor *compositor, XSelectionRequestEvent *event)
1225 {
1226         Atom prop_type;
1227         int prop_format;
1228         unsigned long overflow;
1229         unsigned long names_length;
1230         XSelectionEvent notify;
1231
1232         if(event->selection==compositor->geometry_data_atom)
1233         {
1234                 char *monitor_name;
1235                 CompositedMonitor *monitor;
1236
1237                 XGetWindowProperty(compositor->display, event->requestor, event->property, 0, 64, False, XA_STRING,
1238                         &prop_type, &prop_format, &names_length, &overflow, (unsigned char **)&monitor_name);
1239                 if(prop_type!=XA_STRING || prop_format!=8)
1240                         return;
1241
1242                 monitor = find_monitor_by_name_global(compositor, monitor_name, NULL);
1243                 if(monitor && monitor->enabled)
1244                         XChangeProperty(compositor->display, event->requestor, event->property, XA_INTEGER, 16, PropModeReplace, (unsigned char *)monitor->geometry_data, monitor->geometry_data_size);
1245
1246                 notify.type = SelectionNotify;
1247                 notify.requestor = event->requestor;
1248                 notify.selection = event->selection;
1249                 notify.target = event->target;
1250                 notify.property = (monitor ? event->property : None);
1251                 notify.time = event->time;
1252                 XSendEvent(compositor->display, event->requestor, False, 0, (XEvent *)&notify);
1253         }
1254 }
1255
1256 void process_damage_event(Compositor *compositor, XDamageNotifyEvent *event)
1257 {
1258         CompositedScreen *screen;
1259         CompositedWindow *window;
1260
1261         window = find_window_global(compositor, event->drawable, &screen);
1262         if(window && window->map_state==IsViewable)
1263                 mark_dirty(compositor, screen);
1264 }
1265
1266 void process_shape_event(Compositor *compositor, XShapeEvent *event)
1267 {
1268         CompositedScreen *screen;
1269         CompositedWindow *window;
1270
1271         if(event->kind!=ShapeBounding)
1272                 return;
1273
1274         window = find_window_global(compositor, event->window, &screen);
1275         if(window && window->map_state==IsViewable)
1276         {
1277                 window->recreate_mask = 1;
1278                 mark_dirty(compositor, screen);
1279         }
1280 }
1281
1282 void process_events(Compositor *compositor)
1283 {
1284         int pending;
1285         XEvent event;
1286
1287         pending = 0;
1288         while((pending || !compositor->dirty) && !terminate_requested)
1289         {
1290                 if(!pending)
1291                         pending = XPending(compositor->display);
1292
1293                 XNextEvent(compositor->display, &event);
1294                 if(pending)
1295                         --pending;
1296
1297                 switch(event.type)
1298                 {
1299                 case CreateNotify:
1300                         process_create_window_event(compositor, &event.xcreatewindow);
1301                         break;
1302                 case DestroyNotify:
1303                         process_destroy_window_event(compositor, &event.xdestroywindow);
1304                         break;
1305                 case MapNotify:
1306                         process_map_event(compositor, &event.xmap);
1307                         break;
1308                 case UnmapNotify:
1309                         process_unmap_event(compositor, &event.xunmap);
1310                         break;
1311                 case ReparentNotify:
1312                         process_reparent_event(compositor, &event.xreparent);
1313                         break;
1314                 case ConfigureNotify:
1315                         process_configure_event(compositor, &event.xconfigure);
1316                         break;
1317                 case PropertyNotify:
1318                         process_property_event(compositor, &event.xproperty);
1319                         break;
1320                 case SelectionRequest:
1321                         process_selection_request_event(compositor, &event.xselectionrequest);
1322                         break;
1323                 default:
1324                         if(event.type==compositor->damage_event+XDamageNotify)
1325                                 process_damage_event(compositor, (XDamageNotifyEvent *)&event);
1326                         else if(event.type==compositor->shape_event+ShapeNotify)
1327                                 process_shape_event(compositor, (XShapeEvent *)&event);
1328                         else
1329                                 printf("Event %d\n", event.type);
1330                 }
1331         }
1332 }
1333
1334 void refresh_screen(Compositor *compositor, CompositedScreen *screen)
1335 {
1336         unsigned i;
1337         int use_mask;
1338
1339         for(i=0; i<screen->nwindows; ++i)
1340                 if(screen->windows[i].map_state==IsViewable)
1341                         XDamageSubtract(compositor->display, screen->windows[i].damage, None, None);
1342         glXWaitX();
1343
1344         use_gl(compositor, screen);
1345
1346         glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
1347         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, screen->framebuffer);
1348
1349         use_mask = -1;
1350         glBindVertexArray(screen->window_vertex_array);
1351
1352         if(screen->root_pixmap)
1353         {
1354                 use_mask = 0;
1355                 glUseProgram(screen->program);
1356                 glBindTexture(GL_TEXTURE_2D, screen->root_texture);
1357                 compositor->glXBindTexImageEXT(compositor->display, screen->root_glx_pixmap, GLX_FRONT_LEFT_EXT, NULL);
1358                 glUniform4f(screen->geometry_loc, 0.0f, 0.0f, 1.0f, 1.0f);
1359                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1360                 compositor->glXReleaseTexImageEXT(compositor->display, screen->root_glx_pixmap, GLX_FRONT_LEFT_EXT);
1361         }
1362         else
1363                 glClear(GL_COLOR_BUFFER_BIT);
1364
1365         for(i=0; i<screen->nwindows; ++i)
1366         {
1367                 CompositedWindow *window;
1368
1369                 window = &screen->windows[i];
1370                 if(window->map_state!=IsViewable)
1371                         continue;
1372
1373                 if(window->use_mask!=use_mask)
1374                 {
1375                         use_mask = window->use_mask;
1376                         glUseProgram(use_mask ? screen->masked_program : screen->program);
1377                 }
1378
1379                 if(window->use_mask)
1380                 {
1381                         glActiveTexture(GL_TEXTURE1);
1382                         glBindTexture(GL_TEXTURE_2D, window->mask_texture);
1383                         glActiveTexture(GL_TEXTURE0);
1384                 }
1385
1386                 if(window->recreate_pixmap)
1387                         create_window_pixmap(compositor, screen, window);
1388                 if(window->recreate_mask)
1389                         update_window_mask(compositor, window);
1390
1391                 glBindTexture(GL_TEXTURE_2D, window->texture);
1392                 compositor->glXBindTexImageEXT(compositor->display, window->glx_pixmap, GLX_FRONT_LEFT_EXT, NULL);
1393                 glUniform4f((use_mask ? screen->masked_geometry_loc : screen->geometry_loc),
1394                         (float)window->x/screen->width, 1.0f-(float)(window->y+window->height)/screen->height,
1395                         (float)(window->width+2*window->border)/screen->width, (float)(window->height+2*window->border)/screen->height);
1396                 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1397                 compositor->glXReleaseTexImageEXT(compositor->display, window->glx_pixmap, GLX_FRONT_LEFT_EXT);
1398         }
1399
1400         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
1401         glClear(GL_COLOR_BUFFER_BIT);
1402         glBindTexture(GL_TEXTURE_2D, screen->fb_texture);
1403         glEnable(GL_PRIMITIVE_RESTART);
1404         glPrimitiveRestartIndex(0xFFFF);
1405         if(use_mask)
1406                 glUseProgram(screen->program);
1407
1408         for(i=0; i<screen->nmonitors; ++i)
1409         {
1410                 CompositedMonitor *monitor = &screen->monitors[i];
1411                 if(!monitor->enabled)
1412                         continue;
1413
1414                 glUniform4f(screen->geometry_loc,
1415                         (float)monitor->x/screen->width, 1.0f-(float)(monitor->y+monitor->height)/screen->height,
1416                         (float)monitor->width/screen->width, (float)monitor->height/screen->height);
1417
1418                 glBindVertexArray(monitor->vertex_array);
1419                 glDrawElements(GL_TRIANGLE_STRIP, monitor->nelements, GL_UNSIGNED_SHORT, NULL);
1420         }
1421
1422         glBindVertexArray(0);
1423
1424         glXSwapBuffers(compositor->display, screen->glx_window);
1425
1426         screen->dirty = 0;
1427 }
1428
1429 void refresh_all_screens(Compositor *compositor)
1430 {
1431         unsigned i;
1432
1433         for(i=0; i<compositor->nscreens; ++i)
1434         {
1435                 CompositedScreen *screen = &compositor->screens[i];
1436                 if(screen->dirty)
1437                         refresh_screen(compositor, screen);
1438         }
1439
1440         compositor->dirty = 0;
1441 }
1442
1443 void sighandler(int sig)
1444 {
1445         terminate_requested = 1;
1446         (void)sig;
1447 }
1448
1449 int main()
1450 {
1451         Compositor compositor;
1452
1453         signal(SIGINT, &sighandler);
1454         signal(SIGTERM, &sighandler);
1455
1456         if(!initialize_compositor(&compositor))
1457                 return 1;
1458
1459         while(!terminate_requested)
1460         {
1461                 process_events(&compositor);
1462                 if(compositor.dirty && !terminate_requested)
1463                         refresh_all_screens(&compositor);
1464         }
1465
1466         shutdown_compositor(&compositor);
1467
1468         return 0;
1469 }