1 #define GL_GLEXT_PROTOTYPES
9 #include <X11/extensions/Xcomposite.h>
10 #include <X11/extensions/Xdamage.h>
11 #include <X11/extensions/shape.h>
12 #include <X11/extensions/Xrandr.h>
16 typedef struct CompositedWindow
31 typedef struct CompositedMonitor
39 float keystone_vertical;
41 float vertical_center;
43 unsigned vertex_buffer;
44 unsigned index_buffer;
45 unsigned vertex_array;
46 unsigned tessellation;
50 typedef struct CompositedScreen
60 GLXContext glx_context;
63 unsigned geometry_loc;
64 unsigned window_vertex_buffer;
65 unsigned window_vertex_array;
68 CompositedWindow *windows;
70 unsigned windows_capacity;
71 CompositedMonitor *monitors;
76 typedef struct Compositor
79 CompositedScreen *screens;
82 PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB;
83 PFNGLXBINDTEXIMAGEEXTPROC glXBindTexImageEXT;
84 PFNGLXRELEASETEXIMAGEEXTPROC glXReleaseTexImageEXT;
90 static const char *vshader =
92 "uniform vec4 geometry;\n"
94 "in vec2 texture_coord;\n"
95 "out vec2 texcoord;\n"
98 " gl_Position = vec4((geometry.xy+vertex*geometry.zw)*2.0-1.0, 0.0, 1.0);\n"
99 " texcoord = texture_coord;\n"
102 static const char *fshader =
104 "uniform sampler2D image;\n"
105 "in vec2 texcoord;\n"
106 "out vec4 frag_color;\n"
109 " frag_color = texture(image, texcoord);\n"
112 static const float window_vertices[] =
114 /* vertex texcoord */
115 0.0f, 1.0f, 0.0f, 0.0f,
116 0.0f, 0.0f, 0.0f, 1.0f,
117 1.0f, 1.0f, 1.0f, 0.0f,
118 1.0f, 0.0f, 1.0f, 1.0f
121 int terminate_requested = 0;
123 int x_error_handler(Display *display, XErrorEvent *event)
125 printf("Ignoring X error %d on resource %lx\n", event->error_code, event->resourceid);
130 int with_error(const char *message)
132 fprintf(stderr, "%s\n", message);
136 int initialize_gl(Compositor *compositor, CompositedScreen *screen)
140 GLXFBConfig *configs;
143 XSetWindowAttributes win_attr;
146 attribs[i++] = GLX_DRAWABLE_TYPE;
147 attribs[i++] = GLX_WINDOW_BIT;
148 attribs[i++] = GLX_RENDER_TYPE;
149 attribs[i++] = GLX_RGBA_BIT;
150 attribs[i++] = GLX_DOUBLEBUFFER;
152 attribs[i++] = GLX_BIND_TO_TEXTURE_RGBA_EXT;
156 configs = glXChooseFBConfig(compositor->display, screen->number, attribs, &nconfigs);
157 if(!configs || !nconfigs)
158 return with_error("Could not find a suitable FBConfig");
159 screen->fbconfig = configs[0];
162 vi = glXGetVisualFromFBConfig(compositor->display, screen->fbconfig);
163 win_attr.colormap = XCreateColormap(compositor->display, screen->root, vi->visual, AllocNone);
164 screen->render_window = XCreateWindow(compositor->display, screen->overlay, 0, 0, screen->width, screen->height, 0, vi->depth, InputOutput, vi->visual, CWColormap, &win_attr);
165 XMapWindow(compositor->display, screen->render_window);
167 screen->glx_window = glXCreateWindow(compositor->display, screen->fbconfig, screen->render_window, NULL);
170 attribs[i++] = GLX_CONTEXT_FLAGS_ARB;
171 attribs[i++] = GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
172 attribs[i++] = GLX_CONTEXT_MAJOR_VERSION_ARB;
174 attribs[i++] = GLX_CONTEXT_MINOR_VERSION_ARB;
178 screen->glx_context = compositor->glXCreateContextAttribsARB(compositor->display, screen->fbconfig, NULL, True, attribs);
185 void use_gl(Compositor *compositor, CompositedScreen *screen)
187 glXMakeContextCurrent(compositor->display, screen->glx_window, screen->glx_window, screen->glx_context);
190 unsigned compile_shader(GLenum type, const char *source)
197 shader = glCreateShader(type);
198 glShaderSource(shader, 1, &source, NULL);
199 glCompileShader(shader);
200 glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
201 glGetShaderInfoLog(shader, sizeof(info_log), &length, info_log);
204 fprintf(stderr, "Shader compilation failed:\n%s\n", info_log);
205 glDeleteShader(shader);
209 printf("Shader info log:\n%s\n", info_log);
214 unsigned link_program(unsigned *shaders, unsigned nshaders)
222 program = glCreateProgram();
223 for(i=0; i<nshaders; ++i)
224 glAttachShader(program, shaders[i]);
225 glBindAttribLocation(program, 0, "vertex");
226 glBindAttribLocation(program, 1, "texture_coord");
227 glBindFragDataLocation(program, 0, "frag_color");
228 glLinkProgram(program);
230 glGetProgramiv(program, GL_LINK_STATUS, &status);
231 glGetProgramInfoLog(program, sizeof(info_log), &length, info_log);
234 fprintf(stderr, "Program link failed:\n%s\n", info_log);
235 glDeleteProgram(program);
239 printf("Program info log:\n%s\n", info_log);
244 unsigned create_2d_texture()
247 glGenTextures(1, &texture);
248 glBindTexture(GL_TEXTURE_2D, texture);
249 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
250 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
251 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
255 int create_gl_resources(Compositor *compositor, CompositedScreen *screen)
259 use_gl(compositor, screen);
261 screen->shaders[0] = compile_shader(GL_VERTEX_SHADER, vshader);
262 screen->shaders[1] = compile_shader(GL_FRAGMENT_SHADER, fshader);
263 if(!screen->shaders[0] || !screen->shaders[1])
266 screen->program = link_program(screen->shaders, 2);
270 screen->geometry_loc = glGetUniformLocation(screen->program, "geometry");
272 glGenBuffers(1, &screen->window_vertex_buffer);
273 glBindBuffer(GL_ARRAY_BUFFER, screen->window_vertex_buffer);
274 glBufferData(GL_ARRAY_BUFFER, sizeof(window_vertices), window_vertices, GL_STATIC_DRAW);
276 stride = 4*sizeof(float);
277 glGenVertexArrays(1, &screen->window_vertex_array);
278 glBindVertexArray(screen->window_vertex_array);
279 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, NULL);
280 glEnableVertexAttribArray(0);
281 glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void *)(2*sizeof(float)));
282 glEnableVertexAttribArray(1);
283 glBindVertexArray(0);
285 glBindBuffer(GL_ARRAY_BUFFER, 0);
287 screen->fb_texture = create_2d_texture();
288 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, screen->width, screen->height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
289 glBindTexture(GL_TEXTURE_2D, 0);
291 glGenFramebuffers(1, &screen->framebuffer);
292 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, screen->framebuffer);
293 glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, screen->fb_texture, 0);
294 glDepthMask(GL_FALSE);
295 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
300 CompositedWindow *find_window(CompositedScreen *screen, Window w)
304 for(i=0; i<screen->nwindows; ++i)
305 if(screen->windows[i].window==w)
306 return &screen->windows[i];
311 void create_window_pixmap(Compositor *compositor, CompositedScreen *screen, CompositedWindow *window)
318 glXDestroyPixmap(compositor->display, window->glx_pixmap);
319 XFreePixmap(compositor->display, window->pixmap);
323 attribs[i++] = GLX_TEXTURE_TARGET_EXT;
324 attribs[i++] = GLX_TEXTURE_2D_EXT;
325 attribs[i++] = GLX_TEXTURE_FORMAT_EXT;
326 attribs[i++] = GLX_TEXTURE_FORMAT_RGBA_EXT;
329 window->pixmap = XCompositeNameWindowPixmap(compositor->display, window->window);
330 window->glx_pixmap = glXCreatePixmap(compositor->display, screen->fbconfig, window->pixmap, attribs);
333 CompositedWindow *add_window(Compositor *compositor, CompositedScreen *screen, Window w)
335 CompositedWindow *window;
336 XWindowAttributes win_attr;
338 if(w==screen->root || w==screen->overlay)
341 if(!XGetWindowAttributes(compositor->display, w, &win_attr))
343 printf("XGetWindowAttributes failed; probably the window was already destroyed\n");
346 if(win_attr.class==InputOnly)
349 if(find_window(screen, w))
352 if(screen->nwindows==screen->windows_capacity)
354 screen->windows = (CompositedWindow *)realloc(screen->windows, (screen->windows_capacity+1)*sizeof(CompositedWindow));
355 ++screen->windows_capacity;
358 window = &screen->windows[screen->nwindows++];
361 window->x = win_attr.x;
362 window->y = win_attr.y;
363 window->width = win_attr.width;
364 window->height = win_attr.height;
365 window->border = win_attr.border_width;
366 window->map_state = win_attr.map_state;
368 window->damage = XDamageCreate(compositor->display, window->window, XDamageReportNonEmpty);
369 window->pixmap = None;
370 window->glx_pixmap = None;
372 XCompositeRedirectWindow(compositor->display, window->window, CompositeRedirectManual);
373 if(window->map_state==IsViewable)
374 create_window_pixmap(compositor, screen, window);
376 window->texture = create_2d_texture();
381 void remove_window(Compositor *compositor, CompositedScreen *screen, CompositedWindow *window, int destroyed)
385 glDeleteTextures(1, &window->texture);
388 XDamageDestroy(compositor->display, window->damage);
391 glXDestroyPixmap(compositor->display, window->glx_pixmap);
392 XFreePixmap(compositor->display, window->pixmap);
394 XCompositeUnredirectWindow(compositor->display, window->window, CompositeRedirectManual);
398 for(i=window-screen->windows; i<screen->nwindows; ++i)
399 screen->windows[i] = screen->windows[i+1];
402 CompositedWindow *reorder_window(CompositedScreen *screen, CompositedWindow *window, Window above)
405 CompositedWindow hold;
407 i = window-screen->windows;
410 for(j=0; j<screen->nwindows; ++j)
411 if(screen->windows[j].window==above)
414 if(j>=screen->nwindows || i==j+1)
427 screen->windows[i] = screen->windows[i+1];
432 screen->windows[i] = screen->windows[i-1];
434 screen->windows[j] = hold;
436 return &screen->windows[j];
439 CompositedScreen *find_screen_by_root(Compositor *compositor, Window root)
443 for(i=0; i<compositor->nscreens; ++i)
444 if(compositor->screens[i].root==root)
445 return &compositor->screens[i];
450 CompositedScreen *find_screen_by_window(Compositor *compositor, Window w)
454 for(i=0; i<compositor->nscreens; ++i)
455 for(j=0; j<compositor->screens[i].nwindows; ++j)
456 if(compositor->screens[i].windows[j].window==w)
457 return &compositor->screens[i];
462 void update_monitor_vertices(CompositedScreen *screen, CompositedMonitor *monitor)
467 unsigned short *index_data;
479 t = monitor->tessellation;
481 data_size = (t+1)*(t+1)*4*sizeof(float);
482 vertex_data = (float *)malloc(data_size);
484 aspect = (float)monitor->width/monitor->height;
486 if(monitor->cylinder_depth)
488 cyl_radius = (monitor->cylinder_depth*monitor->cylinder_depth+0.25f)/(2.0f*monitor->cylinder_depth);
489 cyl_arc = 2.0f*asin(0.5f/cyl_radius);
492 sin_ksv = monitor->keystone_vertical/sqrt(1.0f+monitor->keystone_vertical*monitor->keystone_vertical);
493 cos_ksv = sqrt(1.0f-sin_ksv*sin_ksv);
494 distance = monitor->perspective+sin_ksv*((sin_ksv>0)-monitor->vertical_center)/aspect;
497 eye[1] = (monitor->vertical_center-0.5f)/aspect+sin_ksv*distance;
498 eye[2] = cos_ksv*distance;
509 v = vertex_data+(y*(t+1)+x)*3;
510 v[0] = (float)x/t-0.5f;
511 v[1] = ((float)y/t-0.5f)/aspect;
513 if(monitor->cylinder_depth)
515 v[2] = (1.0f-cos(v[0]*cyl_arc))*cyl_radius-monitor->cylinder_depth;
516 v[0] = sin(v[0]*cyl_arc)*cyl_radius;
527 v = vertex_data+(y*(t+1)+x)*3;
529 py = (v[0]-eye[0])*look[0] - (v[1]-eye[1])*look[2] + (v[2]-eye[2])*look[1];
530 pz = (v[0]-eye[0])*look[0] + (v[1]-eye[1])*look[1] + (v[2]-eye[2])*look[2];
531 scale = monitor->perspective/pz;
533 v = vertex_data+(y*(t+1)+x)*4;
534 v[0] = px*scale+0.5f;
535 v[1] = py*aspect*scale+monitor->vertical_center;
536 v[2] = (monitor->x+(float)x*monitor->width/t)/screen->width;
537 v[3] = 1.0f-(monitor->y+(1.0f-(float)y/t)*monitor->height)/screen->height;
540 glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
541 glBufferData(GL_ARRAY_BUFFER, data_size, vertex_data, GL_STATIC_DRAW);
542 glBindBuffer(GL_ARRAY_BUFFER, 0);
545 monitor->nelements = t*((t+1)*2+1)-1;
546 data_size = monitor->nelements*sizeof(unsigned short);
547 index_data = (unsigned short *)malloc(data_size);
552 index_data[i++] = 0xFFFF;
555 index_data[i++] = (y+1)*(t+1)+x;
556 index_data[i++] = y*(t+1)+x;
559 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
560 glBufferData(GL_ELEMENT_ARRAY_BUFFER, data_size, index_data, GL_STATIC_DRAW);
561 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
565 int initialize_monitor(Compositor *compositor, CompositedScreen *screen, XRRScreenResources *xrr_res, unsigned index)
567 CompositedMonitor *monitor;
568 XRROutputInfo *output;
574 monitor = &screen->monitors[index];
576 output = XRRGetOutputInfo(compositor->display, xrr_res, xrr_res->outputs[index]);
577 namelen = strlen(output->name);
578 monitor->name = (char *)malloc(namelen+1);
579 strcpy(monitor->name, output->name);
580 monitor->enabled = !!output->crtc;
581 if(!monitor->enabled)
583 XRRFreeOutputInfo(output);
587 crtc = XRRGetCrtcInfo(compositor->display, xrr_res, output->crtc);
588 monitor->x = crtc->x;
589 monitor->y = crtc->y;
590 monitor->width = crtc->width;
591 monitor->height = crtc->height;
592 XRRFreeCrtcInfo(crtc);
593 XRRFreeOutputInfo(output);
595 monitor->keystone_vertical = 0.0f;
596 monitor->cylinder_depth = 0.0f;
597 monitor->vertical_center = 0.5f;
598 monitor->perspective = 1.0f;
600 glGenBuffers(2, buffers);
601 monitor->vertex_buffer = buffers[0];
602 monitor->index_buffer = buffers[1];
604 monitor->tessellation = 50;
605 update_monitor_vertices(screen, monitor);
606 stride = 4*sizeof(float);
608 glGenVertexArrays(1, &monitor->vertex_array);
609 glBindVertexArray(monitor->vertex_array);
610 glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
611 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, NULL);
612 glEnableVertexAttribArray(0);
613 glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void *)(2*sizeof(float)));
614 glEnableVertexAttribArray(1);
615 glBindBuffer(GL_ARRAY_BUFFER, 0);
616 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
617 glBindVertexArray(0);
622 CompositedMonitor *find_monitor_by_name(CompositedScreen *screen, char *name)
626 for(i=0; i<screen->nmonitors; ++i)
627 if(!strcmp(screen->monitors[i].name, name))
628 return &screen->monitors[i];
633 void update_geometry_correction(Compositor *compositor, CompositedScreen *screen)
637 unsigned long overflow;
638 unsigned long names_length;
640 unsigned long values_length;
645 XGetWindowProperty(compositor->display, screen->root, compositor->monitors_atom, 0, 64, False, XA_STRING,
646 &prop_type, &prop_format, &names_length, &overflow, (unsigned char **)&names);
647 if(prop_type!=XA_STRING || prop_format!=8)
650 XGetWindowProperty(compositor->display, screen->root, compositor->correction_atom, 0, 64, False, XA_INTEGER,
651 &prop_type, &prop_format, &values_length, &overflow, (unsigned char **)&values);
652 if(prop_type!=XA_INTEGER || prop_format!=16)
658 use_gl(compositor, screen);
661 for(i=0; i*4<values_length; ++i)
663 CompositedMonitor *monitor;
665 if(name_ptr>=names+names_length)
668 monitor = find_monitor_by_name(screen, name_ptr);
671 monitor->keystone_vertical = values[i*4]/10000.0f;
672 monitor->cylinder_depth = values[i*4+1]/10000.0f;
673 monitor->vertical_center = values[i*4+2]/10000.0f;
674 monitor->perspective = values[i*4+3]/10000.0f;
677 update_monitor_vertices(screen, monitor);
680 name_ptr += strlen(name_ptr)+1;
687 int initialize_screen(Compositor *compositor, unsigned number)
689 CompositedScreen *screen;
690 const char *extensions;
695 XRRScreenResources *xrr_res;
701 screen = &compositor->screens[number];
702 screen->number = number;
704 extensions = glXQueryExtensionsString(compositor->display, screen->number);
705 if(!strstr(extensions, "GLX_ARB_create_context"))
706 return with_error("GLX_ARB_create_context is required");
707 if(!strstr(extensions, "GLX_EXT_texture_from_pixmap"))
708 return with_error("GLX_EXT_texture_from_pixmap is required");
710 screen->root = RootWindow(compositor->display, screen->number);
711 XSelectInput(compositor->display, screen->root, SubstructureNotifyMask|PropertyChangeMask);
712 screen->overlay = XCompositeGetOverlayWindow(compositor->display, screen->root);
713 XGetGeometry(compositor->display, screen->overlay, &dummy_root, &x, &y, &screen->width, &screen->height, &border, &depth);
714 XShapeCombineRectangles(compositor->display, screen->overlay, ShapeInput, 0, 0, NULL, 0, ShapeSet, Unsorted);
716 if(!initialize_gl(compositor, screen))
719 if(!create_gl_resources(compositor, screen))
722 xrr_res = XRRGetScreenResources(compositor->display, screen->root);
723 screen->nmonitors = xrr_res->noutput;
724 screen->monitors = (CompositedMonitor *)malloc(screen->nmonitors*sizeof(CompositedMonitor));
725 for(i=0; i<screen->nmonitors; ++i)
726 if(!initialize_monitor(compositor, screen, xrr_res, i))
728 XRRFreeScreenResources(xrr_res);
730 update_geometry_correction(compositor, screen);
732 XQueryTree(compositor->display, screen->root, &dummy_root, &dummy_parent, &children, &nchildren);
734 screen->windows = (CompositedWindow *)malloc(nchildren*sizeof(CompositedWindow));
735 screen->nwindows = 0;
736 screen->windows_capacity = nchildren;
738 for(i=0; i<nchildren; ++i)
739 add_window(compositor, screen, children[i]);
748 int initialize_compositor(Compositor *compositor)
756 compositor->display = XOpenDisplay(NULL);
757 if(!compositor->display)
758 return with_error("Could not open X display");
760 XSetErrorHandler(&x_error_handler);
762 if(!XCompositeQueryExtension(compositor->display, &event_base, &error_base))
763 return with_error("XComposite is required but was not found");
764 else if(!XCompositeQueryVersion(compositor->display, &major_ver, &minor_ver))
765 return with_error("Cannot determine XComposite version");
766 else if(major_ver==0 && minor_ver<3)
767 return with_error("XComposite 0.3 or later is required");
769 if(!glXQueryExtension(compositor->display, &event_base, &error_base))
770 return with_error("GLX is required but was not found");
771 else if(!glXQueryVersion(compositor->display, &major_ver, &minor_ver))
772 return with_error("Cannot determine GLX version");
773 else if(major_ver<1 || (major_ver==1 && minor_ver<4))
774 return with_error("GLX 1.4 or later is required");
776 if(!XDamageQueryExtension(compositor->display, &compositor->damage_event, &error_base))
777 return with_error("XDamage is required but was not found");
778 else if(!XDamageQueryVersion(compositor->display, &major_ver, &minor_ver))
779 return with_error("Cannot determine XDamage version");
781 return with_error("XDamage 1.0 or later is required");
783 if(!XShapeQueryExtension(compositor->display, &event_base, &error_base))
784 return with_error("XShape is required but was not found");
785 else if(!XShapeQueryVersion(compositor->display, &major_ver, &minor_ver))
786 return with_error("Cannot determine XShape version");
787 else if(major_ver<1 || (major_ver==1 && minor_ver<1))
788 return with_error("XShape 1.1 or later is required");
790 if(!XRRQueryExtension(compositor->display, &event_base, &error_base))
791 return with_error("XRandR is required but was not found");
792 else if(!XRRQueryVersion(compositor->display, &major_ver, &minor_ver))
793 return with_error("Cannot determine XRandR version");
794 else if(major_ver<1 || (major_ver==1 && minor_ver<2))
795 return with_error("XRandR 1.2 or later is required");
797 compositor->glXCreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)glXGetProcAddress((unsigned char *)"glXCreateContextAttribsARB");
798 compositor->glXBindTexImageEXT = (PFNGLXBINDTEXIMAGEEXTPROC)glXGetProcAddress((unsigned char *)"glXBindTexImageEXT");
799 compositor->glXReleaseTexImageEXT = (PFNGLXRELEASETEXIMAGEEXTPROC)glXGetProcAddress((unsigned char *)"glXReleaseTexImageEXT");
801 compositor->correction_atom = XInternAtom(compositor->display, "GEOMETRY_CORRECTION", False);
802 compositor->monitors_atom = XInternAtom(compositor->display, "GEOMETRY_CORRECTION_MONITORS", False);
804 compositor->nscreens = ScreenCount(compositor->display);
805 compositor->screens = (CompositedScreen *)malloc(compositor->nscreens*sizeof(CompositedScreen));
806 for(i=0; i<compositor->nscreens; ++i)
807 if(!initialize_screen(compositor, i))
810 compositor->dirty = 1;
815 void shutdown_screen(Compositor *compositor, CompositedScreen *screen)
819 use_gl(compositor, screen);
821 for(i=0; i<screen->nwindows; ++i)
823 glDeleteTextures(1, &screen->windows[i].texture);
824 if(screen->windows[i].pixmap)
826 glXDestroyPixmap(compositor->display, screen->windows[i].glx_pixmap);
827 XFreePixmap(compositor->display, screen->windows[i].pixmap);
828 XDamageDestroy(compositor->display, screen->windows[i].damage);
832 for(i=0; i<screen->nmonitors; ++i)
834 free(screen->monitors[i].name);
835 if(screen->monitors[i].enabled)
837 glDeleteBuffers(1, &screen->monitors[i].vertex_buffer);
838 glDeleteBuffers(1, &screen->monitors[i].index_buffer);
839 glDeleteVertexArrays(1, &screen->monitors[i].vertex_array);
843 glDeleteBuffers(1, &screen->window_vertex_buffer);
844 glDeleteVertexArrays(1, &screen->window_vertex_array);
845 glDeleteFramebuffers(1, &screen->framebuffer);
846 glDeleteTextures(1, &screen->fb_texture);
847 glDeleteProgram(screen->program);
848 glDeleteShader(screen->shaders[0]);
849 glDeleteShader(screen->shaders[1]);
851 glXMakeContextCurrent(compositor->display, 0, 0, NULL);
852 glXDestroyContext(compositor->display, screen->glx_context);
853 glXDestroyWindow(compositor->display, screen->glx_window);
854 XDestroyWindow(compositor->display, screen->render_window);
856 XCompositeReleaseOverlayWindow(compositor->display, screen->overlay);
858 free(screen->windows);
859 free(screen->monitors);
862 void shutdown_compositor(Compositor *compositor)
866 for(i=0; i<compositor->nscreens; ++i)
867 shutdown_screen(compositor, &compositor->screens[i]);
868 free(compositor->screens);
870 XCloseDisplay(compositor->display);
873 void mark_dirty(Compositor *compositor, CompositedScreen *screen)
875 compositor->dirty = 1;
879 void process_create_window_event(Compositor *compositor, XCreateWindowEvent *event)
881 CompositedScreen *screen;
883 if((screen = find_screen_by_root(compositor, event->parent)))
884 add_window(compositor, screen, event->window);
887 void process_destroy_window_event(Compositor *compositor, XDestroyWindowEvent *event)
889 CompositedScreen *screen;
890 CompositedWindow *window;
892 if((screen = find_screen_by_root(compositor, event->event)))
893 if((window = find_window(screen, event->window)))
894 remove_window(compositor, screen, window, 1);
897 void process_map_event(Compositor *compositor, XMapEvent *event)
899 CompositedScreen *screen;
900 CompositedWindow *window;
902 screen = find_screen_by_root(compositor, event->event);
906 window = find_window(screen, event->window);
910 window->map_state = IsViewable;
911 create_window_pixmap(compositor, screen, window);
913 mark_dirty(compositor, screen);
916 void process_unmap_event(Compositor *compositor, XUnmapEvent *event)
918 CompositedScreen *screen;
919 CompositedWindow *window;
921 screen = find_screen_by_root(compositor, event->event);
925 window = find_window(screen, event->window);
927 window->map_state = IsUnviewable;
929 mark_dirty(compositor, screen);
932 void process_reparent_event(Compositor *compositor, XReparentEvent *event)
934 CompositedScreen *screen;
935 CompositedWindow *window;
937 screen = find_screen_by_root(compositor, event->event);
941 if(event->parent==screen->root)
942 window = add_window(compositor, screen, event->window);
945 window = find_window(screen, event->window);
949 remove_window(compositor, screen, window, 0);
952 if(window && window->map_state==IsViewable)
953 mark_dirty(compositor, screen);
956 void process_configure_event(Compositor *compositor, XConfigureEvent *event)
958 CompositedScreen *screen;
959 CompositedWindow *window;
961 screen = find_screen_by_root(compositor, event->event);
965 window = find_window(screen, event->window);
969 window->x = event->x;
970 window->y = event->y;
971 if((unsigned)event->width!=window->width || (unsigned)event->height!=window->height || (unsigned)event->border_width!=window->border)
973 window->width = event->width;
974 window->height = event->height;
975 window->border = event->border_width;
976 create_window_pixmap(compositor, screen, window);
978 reorder_window(screen, window, event->above);
980 if(window->map_state==IsViewable)
981 mark_dirty(compositor, screen);
984 void process_property_event(Compositor *compositor, XPropertyEvent *event)
986 CompositedScreen *screen;
988 if(event->atom!=compositor->correction_atom)
991 screen = find_screen_by_root(compositor, event->window);
995 update_geometry_correction(compositor, screen);
998 void process_damage_event(Compositor *compositor, XDamageNotifyEvent *event)
1000 CompositedScreen *screen;
1001 CompositedWindow *window;
1003 screen = find_screen_by_window(compositor, event->drawable);
1007 window = find_window(screen, event->drawable);
1008 if(window->map_state==IsViewable)
1009 mark_dirty(compositor, screen);
1012 int process_event(Compositor *compositor)
1015 if(compositor->dirty)
1017 if(!XCheckMaskEvent(compositor->display, -1, &event))
1021 XNextEvent(compositor->display, &event);
1026 process_create_window_event(compositor, &event.xcreatewindow);
1029 process_destroy_window_event(compositor, &event.xdestroywindow);
1032 process_map_event(compositor, &event.xmap);
1035 process_unmap_event(compositor, &event.xunmap);
1037 case ReparentNotify:
1038 process_reparent_event(compositor, &event.xreparent);
1040 case ConfigureNotify:
1041 process_configure_event(compositor, &event.xconfigure);
1043 case PropertyNotify:
1044 process_property_event(compositor, &event.xproperty);
1047 if(event.type==compositor->damage_event+XDamageNotify)
1048 process_damage_event(compositor, (XDamageNotifyEvent *)&event);
1050 printf("Event %d\n", event.type);
1056 void refresh_screen(Compositor *compositor, CompositedScreen *screen)
1060 use_gl(compositor, screen);
1062 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, screen->framebuffer);
1064 glClearColor(0.5f, 0.5f, 0.5f, 0.0f);
1065 glClear(GL_COLOR_BUFFER_BIT);
1067 glUseProgram(screen->program);
1068 glBindVertexArray(screen->window_vertex_array);
1069 for(i=0; i<screen->nwindows; ++i)
1071 CompositedWindow *window = &screen->windows[i];
1072 if(window->map_state!=IsViewable)
1075 XDamageSubtract(compositor->display, window->damage, None, None);
1077 glBindTexture(GL_TEXTURE_2D, window->texture);
1078 compositor->glXBindTexImageEXT(compositor->display, window->glx_pixmap, GLX_FRONT_LEFT_EXT, NULL);
1079 glUniform4f(screen->geometry_loc,
1080 (float)window->x/screen->width, 1.0f-(float)(window->y+window->height)/screen->height,
1081 (float)(window->width+2*window->border)/screen->width, (float)(window->height+2*window->border)/screen->height);
1082 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1083 compositor->glXReleaseTexImageEXT(compositor->display, window->glx_pixmap, GLX_FRONT_LEFT_EXT);
1086 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
1087 glClearColor(0.5f, 0.0f, 0.5f, 0.0f);
1088 glClear(GL_COLOR_BUFFER_BIT);
1089 glBindTexture(GL_TEXTURE_2D, screen->fb_texture);
1090 glEnable(GL_PRIMITIVE_RESTART);
1091 glPrimitiveRestartIndex(0xFFFF);
1093 for(i=0; i<screen->nmonitors; ++i)
1095 CompositedMonitor *monitor = &screen->monitors[i];
1096 if(!monitor->enabled)
1099 glUniform4f(screen->geometry_loc,
1100 (float)monitor->x/screen->width, 1.0f-(float)(monitor->y+monitor->height)/screen->height,
1101 (float)monitor->width/screen->width, (float)monitor->height/screen->height);
1103 glBindVertexArray(monitor->vertex_array);
1104 glDrawElements(GL_TRIANGLE_STRIP, monitor->nelements, GL_UNSIGNED_SHORT, NULL);
1107 glBindVertexArray(0);
1109 glXSwapBuffers(compositor->display, screen->glx_window);
1114 void refresh_all_screens(Compositor *compositor)
1118 for(i=0; i<compositor->nscreens; ++i)
1120 CompositedScreen *screen = &compositor->screens[i];
1122 refresh_screen(compositor, screen);
1125 compositor->dirty = 0;
1128 void sighandler(int sig)
1130 terminate_requested = 1;
1136 Compositor compositor;
1138 signal(SIGINT, &sighandler);
1139 signal(SIGTERM, &sighandler);
1141 if(!initialize_compositor(&compositor))
1144 while(!terminate_requested)
1146 if(!process_event(&compositor))
1147 refresh_all_screens(&compositor);
1150 shutdown_compositor(&compositor);