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
30 unsigned mask_texture;
41 typedef struct CompositedMonitor
49 float keystone_vertical;
51 float curvature_depth;
52 float vertical_center;
54 unsigned vertex_buffer;
55 unsigned index_buffer;
56 unsigned vertex_array;
57 unsigned tessellation;
60 unsigned geometry_data_size;
63 typedef struct CompositedScreen
73 GLXContext glx_context;
77 unsigned masked_program;
78 int masked_geometry_loc;
79 unsigned window_vertex_buffer;
80 unsigned window_vertex_array;
84 GLXPixmap root_glx_pixmap;
85 unsigned root_texture;
86 CompositedWindow *windows;
88 unsigned windows_capacity;
89 CompositedMonitor *monitors;
94 typedef struct Compositor
97 CompositedScreen *screens;
101 PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB;
102 PFNGLXBINDTEXIMAGEEXTPROC glXBindTexImageEXT;
103 PFNGLXRELEASETEXIMAGEEXTPROC glXReleaseTexImageEXT;
105 Atom correction_atom;
107 Atom geometry_data_atom;
108 Window selection_window;
112 static const char *vshader_src =
114 "uniform vec4 geometry;\n"
116 "in vec2 texture_coord;\n"
117 "out vec2 texcoord;\n"
120 " gl_Position = vec4((geometry.xy+vertex*geometry.zw)*2.0-1.0, 0.0, 1.0);\n"
121 " texcoord = texture_coord;\n"
124 static const char *fshader_src =
126 "uniform sampler2D image;\n"
127 "in vec2 texcoord;\n"
128 "out vec4 frag_color;\n"
131 " frag_color = texture(image, texcoord);\n"
134 static const char *masked_fshader_src =
136 "uniform sampler2D image;\n"
137 "uniform sampler2D mask;\n"
138 "in vec2 texcoord;\n"
139 "out vec4 frag_color;\n"
142 " if(texture(mask, texcoord).r==0.0)\n"
144 " frag_color = texture(image, texcoord);\n"
147 static const float window_vertices[] =
149 /* vertex texcoord */
150 0.0f, 1.0f, 0.0f, 0.0f,
151 0.0f, 0.0f, 0.0f, 1.0f,
152 1.0f, 1.0f, 1.0f, 0.0f,
153 1.0f, 0.0f, 1.0f, 1.0f
156 int terminate_requested = 0;
158 int x_error_handler(Display *display, XErrorEvent *event)
160 printf("Ignoring X error %d on resource %lx\n", event->error_code, event->resourceid);
165 int with_error(const char *message)
167 fprintf(stderr, "%s\n", message);
171 int initialize_gl(Compositor *compositor, CompositedScreen *screen)
175 GLXFBConfig *configs;
178 XSetWindowAttributes win_attr;
181 attribs[i++] = GLX_DRAWABLE_TYPE;
182 attribs[i++] = GLX_WINDOW_BIT;
183 attribs[i++] = GLX_RENDER_TYPE;
184 attribs[i++] = GLX_RGBA_BIT;
185 attribs[i++] = GLX_DOUBLEBUFFER;
187 attribs[i++] = GLX_BIND_TO_TEXTURE_RGBA_EXT;
191 configs = glXChooseFBConfig(compositor->display, screen->number, attribs, &nconfigs);
192 if(!configs || !nconfigs)
193 return with_error("Could not find a suitable FBConfig");
194 screen->fbconfig = configs[0];
197 vi = glXGetVisualFromFBConfig(compositor->display, screen->fbconfig);
198 win_attr.colormap = XCreateColormap(compositor->display, screen->root, vi->visual, AllocNone);
199 screen->render_window = XCreateWindow(compositor->display, screen->overlay, 0, 0, screen->width, screen->height, 0, vi->depth, InputOutput, vi->visual, CWColormap, &win_attr);
200 XMapWindow(compositor->display, screen->render_window);
202 screen->glx_window = glXCreateWindow(compositor->display, screen->fbconfig, screen->render_window, NULL);
205 attribs[i++] = GLX_CONTEXT_FLAGS_ARB;
206 attribs[i++] = GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
207 attribs[i++] = GLX_CONTEXT_MAJOR_VERSION_ARB;
209 attribs[i++] = GLX_CONTEXT_MINOR_VERSION_ARB;
213 screen->glx_context = compositor->glXCreateContextAttribsARB(compositor->display, screen->fbconfig, NULL, True, attribs);
220 void use_gl(Compositor *compositor, CompositedScreen *screen)
222 glXMakeContextCurrent(compositor->display, screen->glx_window, screen->glx_window, screen->glx_context);
225 unsigned compile_shader(GLenum type, const char *source)
232 shader = glCreateShader(type);
233 glShaderSource(shader, 1, &source, NULL);
234 glCompileShader(shader);
235 glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
236 glGetShaderInfoLog(shader, sizeof(info_log), &length, info_log);
239 fprintf(stderr, "Shader compilation failed:\n%s\n", info_log);
240 glDeleteShader(shader);
244 printf("Shader info log:\n%s\n", info_log);
249 unsigned link_program(unsigned vshader, unsigned fshader)
256 program = glCreateProgram();
257 glAttachShader(program, vshader);
258 glAttachShader(program, fshader);
259 glBindAttribLocation(program, 0, "vertex");
260 glBindAttribLocation(program, 1, "texture_coord");
261 glBindFragDataLocation(program, 0, "frag_color");
262 glLinkProgram(program);
264 glGetProgramiv(program, GL_LINK_STATUS, &status);
265 glGetProgramInfoLog(program, sizeof(info_log), &length, info_log);
268 fprintf(stderr, "Program link failed:\n%s\n", info_log);
269 glDeleteProgram(program);
273 printf("Program info log:\n%s\n", info_log);
278 unsigned create_2d_texture()
281 glGenTextures(1, &texture);
282 glBindTexture(GL_TEXTURE_2D, texture);
283 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
284 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
285 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
289 int create_gl_resources(CompositedScreen *screen)
294 screen->shaders[0] = compile_shader(GL_VERTEX_SHADER, vshader_src);
295 screen->shaders[1] = compile_shader(GL_FRAGMENT_SHADER, fshader_src);
296 screen->shaders[2] = compile_shader(GL_FRAGMENT_SHADER, masked_fshader_src);
297 if(!screen->shaders[0] || !screen->shaders[1] || !screen->shaders[2])
300 screen->program = link_program(screen->shaders[0], screen->shaders[1]);
304 screen->masked_program = link_program(screen->shaders[0], screen->shaders[2]);
305 if(!screen->masked_program)
308 screen->geometry_loc = glGetUniformLocation(screen->program, "geometry");
309 screen->masked_geometry_loc = glGetUniformLocation(screen->masked_program, "geometry");
311 loc = glGetUniformLocation(screen->masked_program, "mask");
314 glUseProgram(screen->masked_program);
318 glGenBuffers(1, &screen->window_vertex_buffer);
319 glBindBuffer(GL_ARRAY_BUFFER, screen->window_vertex_buffer);
320 glBufferData(GL_ARRAY_BUFFER, sizeof(window_vertices), window_vertices, GL_STATIC_DRAW);
322 stride = 4*sizeof(float);
323 glGenVertexArrays(1, &screen->window_vertex_array);
324 glBindVertexArray(screen->window_vertex_array);
325 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, NULL);
326 glEnableVertexAttribArray(0);
327 glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void *)(2*sizeof(float)));
328 glEnableVertexAttribArray(1);
329 glBindVertexArray(0);
331 glBindBuffer(GL_ARRAY_BUFFER, 0);
333 screen->fb_texture = create_2d_texture();
334 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, screen->width, screen->height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
335 glBindTexture(GL_TEXTURE_2D, 0);
337 glGenFramebuffers(1, &screen->framebuffer);
338 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, screen->framebuffer);
339 glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, screen->fb_texture, 0);
340 glDepthMask(GL_FALSE);
341 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
343 screen->root_texture = create_2d_texture();
348 CompositedWindow *find_window(CompositedScreen *screen, Window w)
352 for(i=0; i<screen->nwindows; ++i)
353 if(screen->windows[i].window==w)
354 return &screen->windows[i];
359 CompositedWindow *find_window_global(Compositor *compositor, Window w, CompositedScreen **screen)
363 for(i=0; i<compositor->nscreens; ++i)
364 for(j=0; j<compositor->screens[i].nwindows; ++j)
365 if(compositor->screens[i].windows[j].window==w)
368 *screen = &compositor->screens[i];
369 return &compositor->screens[i].windows[j];
377 GLXPixmap pixmap_to_glx_pixmap(Compositor *compositor, CompositedScreen *screen, Pixmap pixmap)
383 attribs[i++] = GLX_TEXTURE_TARGET_EXT;
384 attribs[i++] = GLX_TEXTURE_2D_EXT;
385 attribs[i++] = GLX_TEXTURE_FORMAT_EXT;
386 attribs[i++] = GLX_TEXTURE_FORMAT_RGBA_EXT;
389 return glXCreatePixmap(compositor->display, screen->fbconfig, pixmap, attribs);
392 void create_window_pixmap(Compositor *compositor, CompositedScreen *screen, CompositedWindow *window)
396 glXDestroyPixmap(compositor->display, window->glx_pixmap);
397 XFreePixmap(compositor->display, window->pixmap);
400 window->pixmap = XCompositeNameWindowPixmap(compositor->display, window->window);
401 window->glx_pixmap = pixmap_to_glx_pixmap(compositor, screen, window->pixmap);
402 window->recreate_pixmap = 0;
405 void update_window_mask(Compositor *compositor, CompositedWindow *window)
407 Bool bounding_shaped;
419 XShapeQueryExtents(compositor->display, window->window, &bounding_shaped, &xi, &yi, &width, &height, &clip_shaped, &xi, &yi, &width, &height);
420 window->use_mask = bounding_shaped;
421 if(!window->use_mask)
424 rects = XShapeGetRectangles(compositor->display, window->window, ShapeBounding, &rect_count, &rect_order);
426 width = window->width+2*window->border;
427 height = window->height+2*window->border;
428 data = (unsigned char *)malloc(width*height);
429 memset(data, 0, width*height);
430 for(i=0; i<rect_count; ++i)
432 rects[i].x += window->border;
433 rects[i].y += window->border;
434 if(rects[i].x>=(int)width || rects[i].y>=(int)height)
439 if(-rects[i].x>rects[i].width)
441 rects[i].width += rects[i].x;
447 if(-rects[i].y>rects[i].height)
449 rects[i].height += rects[i].y;
453 if(rects[i].x+rects[i].width>(int)width)
454 rects[i].width = width-rects[i].x;
455 if(rects[i].y+rects[i].height>(int)height)
456 rects[i].height = height-rects[i].y;
458 for(y=0; y<rects[i].height; ++y)
460 unsigned char *row = data+(rects[i].y+y)*width+rects[i].x;
461 memset(row, 255, rects[i].width);
467 glBindTexture(GL_TEXTURE_2D, window->mask_texture);
468 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
469 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, data);
473 window->recreate_mask = 0;
476 CompositedWindow *add_window(Compositor *compositor, CompositedScreen *screen, Window w)
478 CompositedWindow *window;
479 XWindowAttributes win_attr;
481 if(w==screen->root || w==screen->overlay)
484 if(!XGetWindowAttributes(compositor->display, w, &win_attr))
486 printf("XGetWindowAttributes failed; probably the window was already destroyed\n");
489 if(win_attr.class==InputOnly)
492 if(find_window(screen, w))
495 if(screen->nwindows==screen->windows_capacity)
497 screen->windows = (CompositedWindow *)realloc(screen->windows, (screen->windows_capacity+1)*sizeof(CompositedWindow));
498 ++screen->windows_capacity;
501 window = &screen->windows[screen->nwindows++];
504 window->x = win_attr.x;
505 window->y = win_attr.y;
506 window->width = win_attr.width;
507 window->height = win_attr.height;
508 window->border = win_attr.border_width;
509 window->map_state = win_attr.map_state;
511 window->damage = XDamageCreate(compositor->display, window->window, XDamageReportNonEmpty);
512 window->pixmap = None;
513 window->glx_pixmap = None;
515 XCompositeRedirectWindow(compositor->display, window->window, CompositeRedirectManual);
516 window->recreate_pixmap = (window->map_state==IsViewable);
518 window->texture = create_2d_texture();
519 window->mask_texture = create_2d_texture();
520 window->use_mask = 0;
521 window->recreate_mask = (window->map_state==IsViewable);
523 XShapeSelectInput(compositor->display, window->window, ShapeNotifyMask);
528 void remove_window(Compositor *compositor, CompositedScreen *screen, CompositedWindow *window, int destroyed)
532 glDeleteTextures(1, &window->texture);
535 XDamageDestroy(compositor->display, window->damage);
538 glXDestroyPixmap(compositor->display, window->glx_pixmap);
539 XFreePixmap(compositor->display, window->pixmap);
541 XCompositeUnredirectWindow(compositor->display, window->window, CompositeRedirectManual);
545 for(i=window-screen->windows; i<screen->nwindows; ++i)
546 screen->windows[i] = screen->windows[i+1];
549 CompositedWindow *reorder_window(CompositedScreen *screen, CompositedWindow *window, Window above)
552 CompositedWindow hold;
554 i = window-screen->windows;
557 for(j=0; j<screen->nwindows; ++j)
558 if(screen->windows[j].window==above)
561 if(j>=screen->nwindows || i==j+1)
574 screen->windows[i] = screen->windows[i+1];
579 screen->windows[i] = screen->windows[i-1];
581 screen->windows[j] = hold;
583 return &screen->windows[j];
586 CompositedScreen *find_screen_by_root(Compositor *compositor, Window root)
590 for(i=0; i<compositor->nscreens; ++i)
591 if(compositor->screens[i].root==root)
592 return &compositor->screens[i];
597 void update_monitor_vertices(CompositedScreen *screen, CompositedMonitor *monitor)
602 unsigned short *index_data;
614 t = monitor->tessellation;
616 data_size = (t+1)*(t+1)*4*sizeof(float);
617 vertex_data = (float *)malloc(data_size);
619 aspect = (float)monitor->width/monitor->height;
621 if(monitor->curvature_depth)
623 curve_radius = (monitor->curvature_depth*monitor->curvature_depth+0.25f)/(2.0f*monitor->curvature_depth);
624 curve_arc = 2.0f*asin(0.5f/curve_radius);
627 sin_ksv = monitor->keystone_vertical/sqrt(1.0f+monitor->keystone_vertical*monitor->keystone_vertical);
628 cos_ksv = sqrt(1.0f-sin_ksv*sin_ksv);
629 distance = monitor->perspective+sin_ksv*((sin_ksv>0)-monitor->vertical_center)/aspect;
630 if(monitor->curvature_depth<0)
631 distance += -monitor->curvature_depth;
634 eye[1] = (monitor->vertical_center-0.5f)/aspect+sin_ksv*distance;
635 eye[2] = cos_ksv*distance;
646 v = vertex_data+(y*(t+1)+x)*3;
647 v[0] = (float)x/t-0.5f;
648 v[1] = ((float)y/t-0.5f)/aspect;
650 if(monitor->curvature_depth)
652 if(monitor->curvature_type==CYLINDRICAL)
654 v[2] = (1.0f-cos(v[0]*curve_arc))*curve_radius-monitor->curvature_depth;
655 v[0] = sin(v[0]*curve_arc)*curve_radius;
657 else if(monitor->curvature_type==SPHERICAL)
661 v[0] = tan(v[0]*curve_arc)*curve_radius;
662 v[1] = tan(v[1]*curve_arc)*curve_radius;
663 r = sqrt(v[0]*v[0]+v[1]*v[1]+curve_radius*curve_radius)/fabs(curve_radius);
666 v[2] = curve_radius-curve_radius/r-monitor->curvature_depth;
671 monitor->geometry_data[0] = t;
673 monitor->geometry_data[1+i] = eye[i]*4096;
678 monitor->geometry_data[i] = ((x-0.5f)*distance/monitor->perspective)*4096;
679 monitor->geometry_data[i+1] = (eye[1]+look[1]*distance-(y-monitor->vertical_center)*look[2]*distance/monitor->perspective/aspect)*4096;
680 monitor->geometry_data[i+2] = (eye[2]+look[2]*distance+(y-monitor->vertical_center)*look[1]*distance/monitor->perspective/aspect)*4096;
682 for(i=0; i<(t+1)*(t+1)*3; ++i)
683 monitor->geometry_data[16+i] = vertex_data[i]*4096;
692 v = vertex_data+(y*(t+1)+x)*3;
694 py = (v[0]-eye[0])*look[0] - (v[1]-eye[1])*look[2] + (v[2]-eye[2])*look[1];
695 pz = (v[0]-eye[0])*look[0] + (v[1]-eye[1])*look[1] + (v[2]-eye[2])*look[2];
696 scale = monitor->perspective/pz;
698 v = vertex_data+(y*(t+1)+x)*4;
699 v[0] = px*scale+0.5f;
700 v[1] = py*aspect*scale+monitor->vertical_center;
701 v[2] = (monitor->x+(float)x*monitor->width/t)/screen->width;
702 v[3] = 1.0f-(monitor->y+(1.0f-(float)y/t)*monitor->height)/screen->height;
705 glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
706 glBufferData(GL_ARRAY_BUFFER, data_size, vertex_data, GL_STATIC_DRAW);
707 glBindBuffer(GL_ARRAY_BUFFER, 0);
710 monitor->nelements = t*((t+1)*2+1)-1;
711 data_size = monitor->nelements*sizeof(unsigned short);
712 index_data = (unsigned short *)malloc(data_size);
717 index_data[i++] = 0xFFFF;
720 index_data[i++] = (y+1)*(t+1)+x;
721 index_data[i++] = y*(t+1)+x;
724 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
725 glBufferData(GL_ELEMENT_ARRAY_BUFFER, data_size, index_data, GL_STATIC_DRAW);
726 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
730 int initialize_monitor(Compositor *compositor, CompositedScreen *screen, XRRScreenResources *xrr_res, unsigned index)
732 CompositedMonitor *monitor;
733 XRROutputInfo *output;
739 monitor = &screen->monitors[index];
741 output = XRRGetOutputInfo(compositor->display, xrr_res, xrr_res->outputs[index]);
742 namelen = strlen(output->name);
743 monitor->name = (char *)malloc(namelen+1);
744 strcpy(monitor->name, output->name);
745 monitor->enabled = !!output->crtc;
746 if(!monitor->enabled)
748 XRRFreeOutputInfo(output);
749 monitor->geometry_data = NULL;
753 crtc = XRRGetCrtcInfo(compositor->display, xrr_res, output->crtc);
754 monitor->x = crtc->x;
755 monitor->y = crtc->y;
756 monitor->width = crtc->width;
757 monitor->height = crtc->height;
758 XRRFreeCrtcInfo(crtc);
759 XRRFreeOutputInfo(output);
761 monitor->keystone_vertical = 0.0f;
762 monitor->curvature_type = CYLINDRICAL;
763 monitor->curvature_depth = 0.0f;
764 monitor->vertical_center = 0.5f;
765 monitor->perspective = 1.0f;
767 glGenBuffers(2, buffers);
768 monitor->vertex_buffer = buffers[0];
769 monitor->index_buffer = buffers[1];
771 monitor->tessellation = 50;
772 monitor->geometry_data_size = (monitor->tessellation+1)*(monitor->tessellation+1)*3+16;
773 monitor->geometry_data = (short *)malloc(monitor->geometry_data_size*sizeof(short));
774 update_monitor_vertices(screen, monitor);
775 stride = 4*sizeof(float);
777 glGenVertexArrays(1, &monitor->vertex_array);
778 glBindVertexArray(monitor->vertex_array);
779 glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
780 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, NULL);
781 glEnableVertexAttribArray(0);
782 glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void *)(2*sizeof(float)));
783 glEnableVertexAttribArray(1);
784 glBindBuffer(GL_ARRAY_BUFFER, 0);
785 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
786 glBindVertexArray(0);
791 CompositedMonitor *find_monitor_by_name(CompositedScreen *screen, char *name)
795 for(i=0; i<screen->nmonitors; ++i)
796 if(!strcmp(screen->monitors[i].name, name))
797 return &screen->monitors[i];
802 CompositedMonitor *find_monitor_by_name_global(Compositor *compositor, char *name, CompositedScreen **screen)
806 for(i=0; i<compositor->nscreens; ++i)
807 for(j=0; j<compositor->screens[i].nmonitors; ++j)
808 if(!strcmp(compositor->screens[i].monitors[j].name, name))
811 *screen = &compositor->screens[i];
812 return &compositor->screens[i].monitors[j];
820 void update_geometry_correction(Compositor *compositor, CompositedScreen *screen)
824 unsigned long overflow;
825 unsigned long names_length;
827 unsigned long values_length;
832 XGetWindowProperty(compositor->display, screen->root, compositor->monitors_atom, 0, 64, False, XA_STRING,
833 &prop_type, &prop_format, &names_length, &overflow, (unsigned char **)&names);
834 if(prop_type!=XA_STRING || prop_format!=8)
837 XGetWindowProperty(compositor->display, screen->root, compositor->correction_atom, 0, 64, False, XA_INTEGER,
838 &prop_type, &prop_format, &values_length, &overflow, (unsigned char **)&values);
839 if(prop_type!=XA_INTEGER || prop_format!=16)
845 use_gl(compositor, screen);
848 for(i=0; i*5+4<values_length; ++i)
850 CompositedMonitor *monitor;
852 if(name_ptr>=names+names_length)
855 monitor = find_monitor_by_name(screen, name_ptr);
858 monitor->keystone_vertical = values[i*5]/4096.0f;
859 monitor->curvature_type = values[i*5+1];
860 monitor->curvature_depth = values[i*5+2]/4096.0f;
861 monitor->vertical_center = values[i*5+3]/4096.0f;
862 monitor->perspective = values[i*5+4]/4096.0f;
865 update_monitor_vertices(screen, monitor);
868 name_ptr += strlen(name_ptr)+1;
875 void update_root_pixmap(Compositor *compositor, CompositedScreen *screen)
879 unsigned long overflow;
880 unsigned long length;
889 use_gl(compositor, screen);
891 if(screen->root_glx_pixmap)
893 glXDestroyPixmap(compositor->display, screen->root_glx_pixmap);
894 screen->root_glx_pixmap = None;
897 XGetWindowProperty(compositor->display, screen->root, compositor->root_pmap_atom, 0, 1, False, XA_PIXMAP,
898 &prop_type, &prop_format, &length, &overflow, (unsigned char **)&pixmap);
899 if(prop_type!=XA_PIXMAP || prop_format!=32)
901 screen->root_pixmap = None;
905 screen->root_pixmap = pixmap[0];
906 if(XGetGeometry(compositor->display, screen->root_pixmap, &root, &x, &y, &width, &height, &border, &depth))
907 screen->root_glx_pixmap = pixmap_to_glx_pixmap(compositor, screen, screen->root_pixmap);
909 screen->root_pixmap = None;
914 int initialize_screen(Compositor *compositor, unsigned number)
916 CompositedScreen *screen;
917 const char *extensions;
922 XRRScreenResources *xrr_res;
928 screen = &compositor->screens[number];
929 screen->number = number;
931 extensions = glXQueryExtensionsString(compositor->display, screen->number);
932 if(!strstr(extensions, "GLX_ARB_create_context"))
933 return with_error("GLX_ARB_create_context is required");
934 if(!strstr(extensions, "GLX_EXT_texture_from_pixmap"))
935 return with_error("GLX_EXT_texture_from_pixmap is required");
937 screen->root = RootWindow(compositor->display, screen->number);
938 XSelectInput(compositor->display, screen->root, SubstructureNotifyMask|PropertyChangeMask);
939 screen->overlay = XCompositeGetOverlayWindow(compositor->display, screen->root);
940 XGetGeometry(compositor->display, screen->overlay, &dummy_root, &x, &y, &screen->width, &screen->height, &border, &depth);
941 XShapeCombineRectangles(compositor->display, screen->overlay, ShapeInput, 0, 0, NULL, 0, ShapeSet, Unsorted);
943 if(!initialize_gl(compositor, screen))
946 use_gl(compositor, screen);
948 if(!create_gl_resources(screen))
951 xrr_res = XRRGetScreenResources(compositor->display, screen->root);
952 screen->nmonitors = xrr_res->noutput;
953 screen->monitors = (CompositedMonitor *)malloc(screen->nmonitors*sizeof(CompositedMonitor));
954 for(i=0; i<screen->nmonitors; ++i)
955 if(!initialize_monitor(compositor, screen, xrr_res, i))
957 XRRFreeScreenResources(xrr_res);
959 screen->root_pixmap = None;
960 screen->root_glx_pixmap = None;
962 update_geometry_correction(compositor, screen);
963 update_root_pixmap(compositor, screen);
965 XQueryTree(compositor->display, screen->root, &dummy_root, &dummy_parent, &children, &nchildren);
967 screen->windows = (CompositedWindow *)malloc(nchildren*sizeof(CompositedWindow));
968 screen->nwindows = 0;
969 screen->windows_capacity = nchildren;
971 for(i=0; i<nchildren; ++i)
972 add_window(compositor, screen, children[i]);
981 int initialize_compositor(Compositor *compositor)
989 compositor->display = XOpenDisplay(NULL);
990 if(!compositor->display)
991 return with_error("Could not open X display");
993 XSetErrorHandler(&x_error_handler);
995 if(!XCompositeQueryExtension(compositor->display, &event_base, &error_base))
996 return with_error("XComposite is required but was not found");
997 else if(!XCompositeQueryVersion(compositor->display, &major_ver, &minor_ver))
998 return with_error("Cannot determine XComposite version");
999 else if(major_ver==0 && minor_ver<3)
1000 return with_error("XComposite 0.3 or later is required");
1002 if(!glXQueryExtension(compositor->display, &event_base, &error_base))
1003 return with_error("GLX is required but was not found");
1004 else if(!glXQueryVersion(compositor->display, &major_ver, &minor_ver))
1005 return with_error("Cannot determine GLX version");
1006 else if(major_ver<1 || (major_ver==1 && minor_ver<4))
1007 return with_error("GLX 1.4 or later is required");
1009 if(!XDamageQueryExtension(compositor->display, &compositor->damage_event, &error_base))
1010 return with_error("XDamage is required but was not found");
1011 else if(!XDamageQueryVersion(compositor->display, &major_ver, &minor_ver))
1012 return with_error("Cannot determine XDamage version");
1013 else if(major_ver<1)
1014 return with_error("XDamage 1.0 or later is required");
1016 if(!XShapeQueryExtension(compositor->display, &compositor->shape_event, &error_base))
1017 return with_error("XShape is required but was not found");
1018 else if(!XShapeQueryVersion(compositor->display, &major_ver, &minor_ver))
1019 return with_error("Cannot determine XShape version");
1020 else if(major_ver<1 || (major_ver==1 && minor_ver<1))
1021 return with_error("XShape 1.1 or later is required");
1023 if(!XRRQueryExtension(compositor->display, &event_base, &error_base))
1024 return with_error("XRandR is required but was not found");
1025 else if(!XRRQueryVersion(compositor->display, &major_ver, &minor_ver))
1026 return with_error("Cannot determine XRandR version");
1027 else if(major_ver<1 || (major_ver==1 && minor_ver<2))
1028 return with_error("XRandR 1.2 or later is required");
1030 compositor->glXCreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)glXGetProcAddress((unsigned char *)"glXCreateContextAttribsARB");
1031 compositor->glXBindTexImageEXT = (PFNGLXBINDTEXIMAGEEXTPROC)glXGetProcAddress((unsigned char *)"glXBindTexImageEXT");
1032 compositor->glXReleaseTexImageEXT = (PFNGLXRELEASETEXIMAGEEXTPROC)glXGetProcAddress((unsigned char *)"glXReleaseTexImageEXT");
1034 compositor->root_pmap_atom = XInternAtom(compositor->display, "_XROOTPMAP_ID", False);
1035 compositor->correction_atom = XInternAtom(compositor->display, "_MSP_GEOMETRY_CORRECTION", False);
1036 compositor->monitors_atom = XInternAtom(compositor->display, "_MSP_GEOMETRY_CORRECTION_MONITORS", False);
1037 compositor->geometry_data_atom = XInternAtom(compositor->display, "_MSP_GEOMETRY_CORRECTION_DATA", False);
1039 compositor->nscreens = ScreenCount(compositor->display);
1040 compositor->screens = (CompositedScreen *)malloc(compositor->nscreens*sizeof(CompositedScreen));
1041 for(i=0; i<compositor->nscreens; ++i)
1042 if(!initialize_screen(compositor, i))
1045 compositor->selection_window = XCreateWindow(compositor->display, compositor->screens[0].root, 0, 0, 1, 1, 0, CopyFromParent, InputOutput, CopyFromParent, 0, NULL);
1046 XSetSelectionOwner(compositor->display, compositor->geometry_data_atom, compositor->selection_window, CurrentTime);
1048 compositor->dirty = 1;
1053 void shutdown_screen(Compositor *compositor, CompositedScreen *screen)
1057 use_gl(compositor, screen);
1059 for(i=0; i<screen->nwindows; ++i)
1061 glDeleteTextures(1, &screen->windows[i].texture);
1062 glDeleteTextures(1, &screen->windows[i].mask_texture);
1063 if(screen->windows[i].pixmap)
1065 glXDestroyPixmap(compositor->display, screen->windows[i].glx_pixmap);
1066 XFreePixmap(compositor->display, screen->windows[i].pixmap);
1067 XDamageDestroy(compositor->display, screen->windows[i].damage);
1071 for(i=0; i<screen->nmonitors; ++i)
1073 free(screen->monitors[i].name);
1074 if(screen->monitors[i].enabled)
1076 glDeleteBuffers(1, &screen->monitors[i].vertex_buffer);
1077 glDeleteBuffers(1, &screen->monitors[i].index_buffer);
1078 glDeleteVertexArrays(1, &screen->monitors[i].vertex_array);
1080 if(screen->monitors[i].geometry_data)
1081 free(screen->monitors[i].geometry_data);
1084 glDeleteTextures(1, &screen->root_texture);
1085 glXDestroyPixmap(compositor->display, screen->root_glx_pixmap);
1087 glDeleteBuffers(1, &screen->window_vertex_buffer);
1088 glDeleteVertexArrays(1, &screen->window_vertex_array);
1089 glDeleteFramebuffers(1, &screen->framebuffer);
1090 glDeleteTextures(1, &screen->fb_texture);
1091 glDeleteProgram(screen->program);
1092 glDeleteProgram(screen->masked_program);
1094 glDeleteShader(screen->shaders[i]);
1096 glXMakeContextCurrent(compositor->display, None, None, NULL);
1097 glXDestroyContext(compositor->display, screen->glx_context);
1098 glXDestroyWindow(compositor->display, screen->glx_window);
1099 XDestroyWindow(compositor->display, screen->render_window);
1101 XCompositeReleaseOverlayWindow(compositor->display, screen->overlay);
1103 free(screen->windows);
1104 free(screen->monitors);
1107 void shutdown_compositor(Compositor *compositor)
1111 for(i=0; i<compositor->nscreens; ++i)
1112 shutdown_screen(compositor, &compositor->screens[i]);
1113 free(compositor->screens);
1115 XDestroyWindow(compositor->display, compositor->selection_window);
1117 XCloseDisplay(compositor->display);
1120 void mark_dirty(Compositor *compositor, CompositedScreen *screen)
1122 compositor->dirty = 1;
1126 void process_create_window_event(Compositor *compositor, XCreateWindowEvent *event)
1128 CompositedScreen *screen;
1130 if((screen = find_screen_by_root(compositor, event->parent)))
1131 add_window(compositor, screen, event->window);
1134 void process_destroy_window_event(Compositor *compositor, XDestroyWindowEvent *event)
1136 CompositedScreen *screen;
1137 CompositedWindow *window;
1139 if((screen = find_screen_by_root(compositor, event->event)))
1140 if((window = find_window(screen, event->window)))
1142 use_gl(compositor, screen);
1143 remove_window(compositor, screen, window, 1);
1147 void process_map_event(Compositor *compositor, XMapEvent *event)
1149 CompositedScreen *screen;
1150 CompositedWindow *window;
1152 screen = find_screen_by_root(compositor, event->event);
1156 window = find_window(screen, event->window);
1160 window->map_state = IsViewable;
1161 window->recreate_pixmap = 1;
1162 window->recreate_mask = 1;
1164 mark_dirty(compositor, screen);
1167 void process_unmap_event(Compositor *compositor, XUnmapEvent *event)
1169 CompositedScreen *screen;
1170 CompositedWindow *window;
1172 screen = find_screen_by_root(compositor, event->event);
1176 window = find_window(screen, event->window);
1178 window->map_state = IsUnviewable;
1180 mark_dirty(compositor, screen);
1183 void process_reparent_event(Compositor *compositor, XReparentEvent *event)
1185 CompositedScreen *screen;
1186 CompositedWindow *window;
1188 screen = find_screen_by_root(compositor, event->event);
1192 if(event->parent==screen->root)
1193 window = add_window(compositor, screen, event->window);
1196 window = find_window(screen, event->window);
1200 remove_window(compositor, screen, window, 0);
1203 if(window && window->map_state==IsViewable)
1204 mark_dirty(compositor, screen);
1207 void process_configure_event(Compositor *compositor, XConfigureEvent *event)
1209 CompositedScreen *screen;
1210 CompositedWindow *window;
1212 screen = find_screen_by_root(compositor, event->event);
1216 window = find_window(screen, event->window);
1220 window->x = event->x;
1221 window->y = event->y;
1222 if((unsigned)event->width!=window->width || (unsigned)event->height!=window->height || (unsigned)event->border_width!=window->border)
1224 window->width = event->width;
1225 window->height = event->height;
1226 window->border = event->border_width;
1227 window->recreate_pixmap = 1;
1229 reorder_window(screen, window, event->above);
1231 if(window->map_state==IsViewable)
1232 mark_dirty(compositor, screen);
1235 void process_property_event(Compositor *compositor, XPropertyEvent *event)
1237 CompositedScreen *screen;
1239 screen = find_screen_by_root(compositor, event->window);
1243 if(event->atom==compositor->correction_atom)
1244 update_geometry_correction(compositor, screen);
1245 else if(event->atom==compositor->root_pmap_atom)
1246 update_root_pixmap(compositor, screen);
1249 void process_selection_request_event(Compositor *compositor, XSelectionRequestEvent *event)
1253 unsigned long overflow;
1254 unsigned long names_length;
1255 XSelectionEvent notify;
1257 if(event->selection==compositor->geometry_data_atom)
1260 CompositedMonitor *monitor;
1262 XGetWindowProperty(compositor->display, event->requestor, event->property, 0, 64, False, XA_STRING,
1263 &prop_type, &prop_format, &names_length, &overflow, (unsigned char **)&monitor_name);
1264 if(prop_type!=XA_STRING || prop_format!=8)
1267 monitor = find_monitor_by_name_global(compositor, monitor_name, NULL);
1268 if(monitor && monitor->enabled)
1269 XChangeProperty(compositor->display, event->requestor, event->property, XA_INTEGER, 16, PropModeReplace, (unsigned char *)monitor->geometry_data, monitor->geometry_data_size);
1271 notify.type = SelectionNotify;
1272 notify.requestor = event->requestor;
1273 notify.selection = event->selection;
1274 notify.target = event->target;
1275 notify.property = (monitor ? event->property : None);
1276 notify.time = event->time;
1277 XSendEvent(compositor->display, event->requestor, False, 0, (XEvent *)¬ify);
1281 void process_damage_event(Compositor *compositor, XDamageNotifyEvent *event)
1283 CompositedScreen *screen;
1284 CompositedWindow *window;
1286 window = find_window_global(compositor, event->drawable, &screen);
1287 if(window && window->map_state==IsViewable)
1288 mark_dirty(compositor, screen);
1291 void process_shape_event(Compositor *compositor, XShapeEvent *event)
1293 CompositedScreen *screen;
1294 CompositedWindow *window;
1296 if(event->kind!=ShapeBounding)
1299 window = find_window_global(compositor, event->window, &screen);
1300 if(window && window->map_state==IsViewable)
1302 window->recreate_mask = 1;
1303 mark_dirty(compositor, screen);
1307 void process_events(Compositor *compositor)
1313 while((pending || !compositor->dirty) && !terminate_requested)
1316 pending = XPending(compositor->display);
1318 XNextEvent(compositor->display, &event);
1325 process_create_window_event(compositor, &event.xcreatewindow);
1328 process_destroy_window_event(compositor, &event.xdestroywindow);
1331 process_map_event(compositor, &event.xmap);
1334 process_unmap_event(compositor, &event.xunmap);
1336 case ReparentNotify:
1337 process_reparent_event(compositor, &event.xreparent);
1339 case ConfigureNotify:
1340 process_configure_event(compositor, &event.xconfigure);
1342 case PropertyNotify:
1343 process_property_event(compositor, &event.xproperty);
1345 case SelectionRequest:
1346 process_selection_request_event(compositor, &event.xselectionrequest);
1349 if(event.type==compositor->damage_event+XDamageNotify)
1350 process_damage_event(compositor, (XDamageNotifyEvent *)&event);
1351 else if(event.type==compositor->shape_event+ShapeNotify)
1352 process_shape_event(compositor, (XShapeEvent *)&event);
1354 printf("Event %d\n", event.type);
1359 void refresh_screen(Compositor *compositor, CompositedScreen *screen)
1364 for(i=0; i<screen->nwindows; ++i)
1365 if(screen->windows[i].map_state==IsViewable)
1366 XDamageSubtract(compositor->display, screen->windows[i].damage, None, None);
1369 use_gl(compositor, screen);
1371 glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
1372 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, screen->framebuffer);
1375 glBindVertexArray(screen->window_vertex_array);
1377 if(screen->root_pixmap)
1380 glUseProgram(screen->program);
1381 glBindTexture(GL_TEXTURE_2D, screen->root_texture);
1382 compositor->glXBindTexImageEXT(compositor->display, screen->root_glx_pixmap, GLX_FRONT_LEFT_EXT, NULL);
1383 glUniform4f(screen->geometry_loc, 0.0f, 0.0f, 1.0f, 1.0f);
1384 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1385 compositor->glXReleaseTexImageEXT(compositor->display, screen->root_glx_pixmap, GLX_FRONT_LEFT_EXT);
1388 glClear(GL_COLOR_BUFFER_BIT);
1390 for(i=0; i<screen->nwindows; ++i)
1392 CompositedWindow *window;
1394 window = &screen->windows[i];
1395 if(window->map_state!=IsViewable)
1398 if(window->use_mask!=use_mask)
1400 use_mask = window->use_mask;
1401 glUseProgram(use_mask ? screen->masked_program : screen->program);
1404 if(window->use_mask)
1406 glActiveTexture(GL_TEXTURE1);
1407 glBindTexture(GL_TEXTURE_2D, window->mask_texture);
1408 glActiveTexture(GL_TEXTURE0);
1411 if(window->recreate_pixmap)
1412 create_window_pixmap(compositor, screen, window);
1413 if(window->recreate_mask)
1414 update_window_mask(compositor, window);
1416 glBindTexture(GL_TEXTURE_2D, window->texture);
1417 compositor->glXBindTexImageEXT(compositor->display, window->glx_pixmap, GLX_FRONT_LEFT_EXT, NULL);
1418 glUniform4f((use_mask ? screen->masked_geometry_loc : screen->geometry_loc),
1419 (float)window->x/screen->width, 1.0f-(float)(window->y+window->height)/screen->height,
1420 (float)(window->width+2*window->border)/screen->width, (float)(window->height+2*window->border)/screen->height);
1421 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1422 compositor->glXReleaseTexImageEXT(compositor->display, window->glx_pixmap, GLX_FRONT_LEFT_EXT);
1425 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
1426 glClear(GL_COLOR_BUFFER_BIT);
1427 glBindTexture(GL_TEXTURE_2D, screen->fb_texture);
1428 glEnable(GL_PRIMITIVE_RESTART);
1429 glPrimitiveRestartIndex(0xFFFF);
1431 glUseProgram(screen->program);
1433 for(i=0; i<screen->nmonitors; ++i)
1435 CompositedMonitor *monitor = &screen->monitors[i];
1436 if(!monitor->enabled)
1439 glUniform4f(screen->geometry_loc,
1440 (float)monitor->x/screen->width, 1.0f-(float)(monitor->y+monitor->height)/screen->height,
1441 (float)monitor->width/screen->width, (float)monitor->height/screen->height);
1443 glBindVertexArray(monitor->vertex_array);
1444 glDrawElements(GL_TRIANGLE_STRIP, monitor->nelements, GL_UNSIGNED_SHORT, NULL);
1447 glBindVertexArray(0);
1449 glXSwapBuffers(compositor->display, screen->glx_window);
1454 void refresh_all_screens(Compositor *compositor)
1458 for(i=0; i<compositor->nscreens; ++i)
1460 CompositedScreen *screen = &compositor->screens[i];
1462 refresh_screen(compositor, screen);
1465 compositor->dirty = 0;
1468 void sighandler(int sig)
1470 terminate_requested = 1;
1476 Compositor compositor;
1478 signal(SIGINT, &sighandler);
1479 signal(SIGTERM, &sighandler);
1481 if(!initialize_compositor(&compositor))
1484 while(!terminate_requested)
1486 process_events(&compositor);
1487 if(compositor.dirty && !terminate_requested)
1488 refresh_all_screens(&compositor);
1491 shutdown_compositor(&compositor);