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;
102 PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB;
103 PFNGLXBINDTEXIMAGEEXTPROC glXBindTexImageEXT;
104 PFNGLXRELEASETEXIMAGEEXTPROC glXReleaseTexImageEXT;
106 Atom correction_atom;
108 Atom geometry_data_atom;
109 Window selection_window;
113 static const char *vshader_src =
115 "uniform vec4 geometry;\n"
117 "in vec2 texture_coord;\n"
118 "out vec2 texcoord;\n"
121 " gl_Position = vec4((geometry.xy+vertex*geometry.zw)*2.0-1.0, 0.0, 1.0);\n"
122 " texcoord = texture_coord;\n"
125 static const char *fshader_src =
127 "uniform sampler2D image;\n"
128 "in vec2 texcoord;\n"
129 "out vec4 frag_color;\n"
132 " frag_color = texture(image, texcoord);\n"
135 static const char *masked_fshader_src =
137 "uniform sampler2D image;\n"
138 "uniform sampler2D mask;\n"
139 "in vec2 texcoord;\n"
140 "out vec4 frag_color;\n"
143 " if(texture(mask, texcoord).r==0.0)\n"
145 " frag_color = texture(image, texcoord);\n"
148 static const float window_vertices[] =
150 /* vertex texcoord */
151 0.0f, 1.0f, 0.0f, 0.0f,
152 0.0f, 0.0f, 0.0f, 1.0f,
153 1.0f, 1.0f, 1.0f, 0.0f,
154 1.0f, 0.0f, 1.0f, 1.0f
157 int terminate_requested = 0;
159 int x_error_handler(Display *display, XErrorEvent *event)
161 printf("Ignoring X error %d on resource %lx\n", event->error_code, event->resourceid);
166 int with_error(const char *message)
168 fprintf(stderr, "%s\n", message);
172 int initialize_gl(Compositor *compositor, CompositedScreen *screen)
176 GLXFBConfig *configs;
179 XSetWindowAttributes win_attr;
182 attribs[i++] = GLX_DRAWABLE_TYPE;
183 attribs[i++] = GLX_WINDOW_BIT;
184 attribs[i++] = GLX_RENDER_TYPE;
185 attribs[i++] = GLX_RGBA_BIT;
186 attribs[i++] = GLX_DOUBLEBUFFER;
188 attribs[i++] = GLX_BIND_TO_TEXTURE_RGBA_EXT;
192 configs = glXChooseFBConfig(compositor->display, screen->number, attribs, &nconfigs);
193 if(!configs || !nconfigs)
194 return with_error("Could not find a suitable FBConfig");
195 screen->fbconfig = configs[0];
198 vi = glXGetVisualFromFBConfig(compositor->display, screen->fbconfig);
199 win_attr.colormap = XCreateColormap(compositor->display, screen->root, vi->visual, AllocNone);
200 screen->render_window = XCreateWindow(compositor->display, screen->overlay, 0, 0, screen->width, screen->height, 0, vi->depth, InputOutput, vi->visual, CWColormap, &win_attr);
201 XMapWindow(compositor->display, screen->render_window);
203 screen->glx_window = glXCreateWindow(compositor->display, screen->fbconfig, screen->render_window, NULL);
206 attribs[i++] = GLX_CONTEXT_FLAGS_ARB;
207 attribs[i++] = GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
208 attribs[i++] = GLX_CONTEXT_MAJOR_VERSION_ARB;
210 attribs[i++] = GLX_CONTEXT_MINOR_VERSION_ARB;
214 screen->glx_context = compositor->glXCreateContextAttribsARB(compositor->display, screen->fbconfig, NULL, True, attribs);
221 void use_gl(Compositor *compositor, CompositedScreen *screen)
223 glXMakeContextCurrent(compositor->display, screen->glx_window, screen->glx_window, screen->glx_context);
226 unsigned compile_shader(GLenum type, const char *source)
233 shader = glCreateShader(type);
234 glShaderSource(shader, 1, &source, NULL);
235 glCompileShader(shader);
236 glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
237 glGetShaderInfoLog(shader, sizeof(info_log), &length, info_log);
240 fprintf(stderr, "Shader compilation failed:\n%s\n", info_log);
241 glDeleteShader(shader);
245 printf("Shader info log:\n%s\n", info_log);
250 unsigned link_program(unsigned vshader, unsigned fshader)
257 program = glCreateProgram();
258 glAttachShader(program, vshader);
259 glAttachShader(program, fshader);
260 glBindAttribLocation(program, 0, "vertex");
261 glBindAttribLocation(program, 1, "texture_coord");
262 glBindFragDataLocation(program, 0, "frag_color");
263 glLinkProgram(program);
265 glGetProgramiv(program, GL_LINK_STATUS, &status);
266 glGetProgramInfoLog(program, sizeof(info_log), &length, info_log);
269 fprintf(stderr, "Program link failed:\n%s\n", info_log);
270 glDeleteProgram(program);
274 printf("Program info log:\n%s\n", info_log);
279 unsigned create_2d_texture()
282 glGenTextures(1, &texture);
283 glBindTexture(GL_TEXTURE_2D, texture);
284 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
285 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
286 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
290 int create_gl_resources(CompositedScreen *screen)
295 screen->shaders[0] = compile_shader(GL_VERTEX_SHADER, vshader_src);
296 screen->shaders[1] = compile_shader(GL_FRAGMENT_SHADER, fshader_src);
297 screen->shaders[2] = compile_shader(GL_FRAGMENT_SHADER, masked_fshader_src);
298 if(!screen->shaders[0] || !screen->shaders[1] || !screen->shaders[2])
301 screen->program = link_program(screen->shaders[0], screen->shaders[1]);
305 screen->masked_program = link_program(screen->shaders[0], screen->shaders[2]);
306 if(!screen->masked_program)
309 screen->geometry_loc = glGetUniformLocation(screen->program, "geometry");
310 screen->masked_geometry_loc = glGetUniformLocation(screen->masked_program, "geometry");
312 loc = glGetUniformLocation(screen->masked_program, "mask");
315 glUseProgram(screen->masked_program);
319 glGenBuffers(1, &screen->window_vertex_buffer);
320 glBindBuffer(GL_ARRAY_BUFFER, screen->window_vertex_buffer);
321 glBufferData(GL_ARRAY_BUFFER, sizeof(window_vertices), window_vertices, GL_STATIC_DRAW);
323 stride = 4*sizeof(float);
324 glGenVertexArrays(1, &screen->window_vertex_array);
325 glBindVertexArray(screen->window_vertex_array);
326 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, NULL);
327 glEnableVertexAttribArray(0);
328 glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void *)(2*sizeof(float)));
329 glEnableVertexAttribArray(1);
330 glBindVertexArray(0);
332 glBindBuffer(GL_ARRAY_BUFFER, 0);
334 screen->fb_texture = create_2d_texture();
335 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, screen->width, screen->height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
336 glBindTexture(GL_TEXTURE_2D, 0);
338 glGenFramebuffers(1, &screen->framebuffer);
339 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, screen->framebuffer);
340 glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, screen->fb_texture, 0);
341 glDepthMask(GL_FALSE);
342 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
344 screen->root_texture = create_2d_texture();
349 CompositedWindow *find_window(CompositedScreen *screen, Window w)
353 for(i=0; i<screen->nwindows; ++i)
354 if(screen->windows[i].window==w)
355 return &screen->windows[i];
360 CompositedWindow *find_window_global(Compositor *compositor, Window w, CompositedScreen **screen)
364 for(i=0; i<compositor->nscreens; ++i)
365 for(j=0; j<compositor->screens[i].nwindows; ++j)
366 if(compositor->screens[i].windows[j].window==w)
369 *screen = &compositor->screens[i];
370 return &compositor->screens[i].windows[j];
378 GLXPixmap pixmap_to_glx_pixmap(Compositor *compositor, CompositedScreen *screen, Pixmap pixmap)
384 attribs[i++] = GLX_TEXTURE_TARGET_EXT;
385 attribs[i++] = GLX_TEXTURE_2D_EXT;
386 attribs[i++] = GLX_TEXTURE_FORMAT_EXT;
387 attribs[i++] = GLX_TEXTURE_FORMAT_RGBA_EXT;
390 return glXCreatePixmap(compositor->display, screen->fbconfig, pixmap, attribs);
393 void create_window_pixmap(Compositor *compositor, CompositedScreen *screen, CompositedWindow *window)
397 glXDestroyPixmap(compositor->display, window->glx_pixmap);
398 XFreePixmap(compositor->display, window->pixmap);
401 window->pixmap = XCompositeNameWindowPixmap(compositor->display, window->window);
402 window->glx_pixmap = pixmap_to_glx_pixmap(compositor, screen, window->pixmap);
403 window->recreate_pixmap = 0;
406 void update_window_mask(Compositor *compositor, CompositedWindow *window)
408 Bool bounding_shaped;
420 XShapeQueryExtents(compositor->display, window->window, &bounding_shaped, &xi, &yi, &width, &height, &clip_shaped, &xi, &yi, &width, &height);
421 window->use_mask = bounding_shaped;
422 if(!window->use_mask)
425 rects = XShapeGetRectangles(compositor->display, window->window, ShapeBounding, &rect_count, &rect_order);
429 width = window->width+2*window->border;
430 height = window->height+2*window->border;
431 data = (unsigned char *)malloc(width*height);
432 memset(data, 0, width*height);
433 for(i=0; i<rect_count; ++i)
435 rects[i].x += window->border;
436 rects[i].y += window->border;
437 if(rects[i].x>=(int)width || rects[i].y>=(int)height)
442 if(-rects[i].x>rects[i].width)
444 rects[i].width += rects[i].x;
450 if(-rects[i].y>rects[i].height)
452 rects[i].height += rects[i].y;
456 if(rects[i].x+rects[i].width>(int)width)
457 rects[i].width = width-rects[i].x;
458 if(rects[i].y+rects[i].height>(int)height)
459 rects[i].height = height-rects[i].y;
461 for(y=0; y<rects[i].height; ++y)
463 unsigned char *row = data+(rects[i].y+y)*width+rects[i].x;
464 memset(row, 255, rects[i].width);
470 glBindTexture(GL_TEXTURE_2D, window->mask_texture);
471 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
472 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, data);
476 window->recreate_mask = 0;
479 CompositedWindow *add_window(Compositor *compositor, CompositedScreen *screen, Window w)
481 CompositedWindow *window;
482 XWindowAttributes win_attr;
484 if(w==screen->root || w==screen->overlay)
487 if(!XGetWindowAttributes(compositor->display, w, &win_attr))
489 printf("XGetWindowAttributes failed; probably the window was already destroyed\n");
492 if(win_attr.class==InputOnly)
495 if(find_window(screen, w))
498 if(screen->nwindows==screen->windows_capacity)
500 screen->windows = (CompositedWindow *)realloc(screen->windows, (screen->windows_capacity+1)*sizeof(CompositedWindow));
501 ++screen->windows_capacity;
504 window = &screen->windows[screen->nwindows++];
507 window->x = win_attr.x;
508 window->y = win_attr.y;
509 window->width = win_attr.width;
510 window->height = win_attr.height;
511 window->border = win_attr.border_width;
512 window->map_state = win_attr.map_state;
514 window->damage = XDamageCreate(compositor->display, window->window, XDamageReportNonEmpty);
515 window->pixmap = None;
516 window->glx_pixmap = None;
518 XCompositeRedirectWindow(compositor->display, window->window, CompositeRedirectManual);
519 window->recreate_pixmap = (window->map_state==IsViewable);
521 window->texture = create_2d_texture();
522 window->mask_texture = create_2d_texture();
523 window->use_mask = 0;
524 window->recreate_mask = (window->map_state==IsViewable);
526 XShapeSelectInput(compositor->display, window->window, ShapeNotifyMask);
531 void remove_window(Compositor *compositor, CompositedScreen *screen, CompositedWindow *window, int destroyed)
535 glDeleteTextures(1, &window->texture);
538 XDamageDestroy(compositor->display, window->damage);
541 glXDestroyPixmap(compositor->display, window->glx_pixmap);
542 XFreePixmap(compositor->display, window->pixmap);
544 XCompositeUnredirectWindow(compositor->display, window->window, CompositeRedirectManual);
548 for(i=window-screen->windows; i<screen->nwindows; ++i)
549 screen->windows[i] = screen->windows[i+1];
552 CompositedWindow *reorder_window(CompositedScreen *screen, CompositedWindow *window, Window above)
555 CompositedWindow hold;
557 i = window-screen->windows;
560 for(j=0; j<screen->nwindows; ++j)
561 if(screen->windows[j].window==above)
564 if(j>=screen->nwindows || i==j+1)
577 screen->windows[i] = screen->windows[i+1];
582 screen->windows[i] = screen->windows[i-1];
584 screen->windows[j] = hold;
586 return &screen->windows[j];
589 CompositedScreen *find_screen_by_root(Compositor *compositor, Window root)
593 for(i=0; i<compositor->nscreens; ++i)
594 if(compositor->screens[i].root==root)
595 return &compositor->screens[i];
600 void create_geometry_correction(CompositedMonitor *monitor)
605 glGenBuffers(2, buffers);
606 monitor->vertex_buffer = buffers[0];
607 monitor->index_buffer = buffers[1];
609 monitor->tessellation = 50;
610 monitor->geometry_data_size = (monitor->tessellation+1)*(monitor->tessellation+1)*3+16;
611 monitor->geometry_data = (short *)malloc(monitor->geometry_data_size*sizeof(short));
612 stride = 4*sizeof(float);
614 glGenVertexArrays(1, &monitor->vertex_array);
615 glBindVertexArray(monitor->vertex_array);
616 glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
617 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, NULL);
618 glEnableVertexAttribArray(0);
619 glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void *)(2*sizeof(float)));
620 glEnableVertexAttribArray(1);
621 glBindBuffer(GL_ARRAY_BUFFER, 0);
622 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
623 glBindVertexArray(0);
626 void free_geometry_correction(CompositedMonitor *monitor)
630 buffers[0] = monitor->vertex_buffer;
631 buffers[1] = monitor->index_buffer;
632 glDeleteBuffers(2, buffers);
633 monitor->vertex_buffer = 0;
634 monitor->index_buffer = 0;
636 glDeleteVertexArrays(1, &monitor->vertex_array);
638 free(monitor->geometry_data);
639 monitor->geometry_data = 0;
642 void update_monitor_vertices(CompositedScreen *screen, CompositedMonitor *monitor)
647 unsigned short *index_data;
659 t = monitor->tessellation;
661 data_size = (t+1)*(t+1)*4*sizeof(float);
662 vertex_data = (float *)malloc(data_size);
664 aspect = (float)monitor->width/monitor->height;
666 if(monitor->curvature_depth)
668 curve_radius = (monitor->curvature_depth*monitor->curvature_depth+0.25f)/(2.0f*monitor->curvature_depth);
669 curve_arc = 2.0f*asin(0.5f/curve_radius);
672 sin_ksv = monitor->keystone_vertical/sqrt(1.0f+monitor->keystone_vertical*monitor->keystone_vertical);
673 cos_ksv = sqrt(1.0f-sin_ksv*sin_ksv);
674 distance = monitor->perspective+sin_ksv*((sin_ksv>0)-monitor->vertical_center)/aspect;
675 if(monitor->curvature_depth<0)
676 distance += -monitor->curvature_depth;
679 eye[1] = (monitor->vertical_center-0.5f)/aspect+sin_ksv*distance;
680 eye[2] = cos_ksv*distance;
691 v = vertex_data+(y*(t+1)+x)*3;
692 v[0] = (float)x/t-0.5f;
693 v[1] = ((float)y/t-0.5f)/aspect;
695 if(monitor->curvature_depth)
697 if(monitor->curvature_type==CYLINDRICAL)
699 v[2] = (1.0f-cos(v[0]*curve_arc))*curve_radius-monitor->curvature_depth;
700 v[0] = sin(v[0]*curve_arc)*curve_radius;
702 else if(monitor->curvature_type==SPHERICAL)
706 v[0] = tan(v[0]*curve_arc)*curve_radius;
707 v[1] = tan(v[1]*curve_arc)*curve_radius;
708 r = sqrt(v[0]*v[0]+v[1]*v[1]+curve_radius*curve_radius)/fabs(curve_radius);
711 v[2] = curve_radius-curve_radius/r-monitor->curvature_depth;
716 monitor->geometry_data[0] = t;
718 monitor->geometry_data[1+i] = eye[i]*4096;
723 monitor->geometry_data[i] = ((x-0.5f)*distance/monitor->perspective)*4096;
724 monitor->geometry_data[i+1] = (eye[1]+look[1]*distance-(y-monitor->vertical_center)*look[2]*distance/monitor->perspective/aspect)*4096;
725 monitor->geometry_data[i+2] = (eye[2]+look[2]*distance+(y-monitor->vertical_center)*look[1]*distance/monitor->perspective/aspect)*4096;
727 for(i=0; i<(t+1)*(t+1)*3; ++i)
728 monitor->geometry_data[16+i] = vertex_data[i]*4096;
737 v = vertex_data+(y*(t+1)+x)*3;
739 py = (v[0]-eye[0])*look[0] - (v[1]-eye[1])*look[2] + (v[2]-eye[2])*look[1];
740 pz = (v[0]-eye[0])*look[0] + (v[1]-eye[1])*look[1] + (v[2]-eye[2])*look[2];
741 scale = monitor->perspective/pz;
743 v = vertex_data+(y*(t+1)+x)*4;
744 v[0] = px*scale+0.5f;
745 v[1] = py*aspect*scale+monitor->vertical_center;
746 v[2] = (monitor->x+(float)x*monitor->width/t)/screen->width;
747 v[3] = 1.0f-(monitor->y+(1.0f-(float)y/t)*monitor->height)/screen->height;
750 glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
751 glBufferData(GL_ARRAY_BUFFER, data_size, vertex_data, GL_STATIC_DRAW);
752 glBindBuffer(GL_ARRAY_BUFFER, 0);
755 monitor->nelements = t*((t+1)*2+1)-1;
756 data_size = monitor->nelements*sizeof(unsigned short);
757 index_data = (unsigned short *)malloc(data_size);
762 index_data[i++] = 0xFFFF;
765 index_data[i++] = (y+1)*(t+1)+x;
766 index_data[i++] = y*(t+1)+x;
769 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
770 glBufferData(GL_ELEMENT_ARRAY_BUFFER, data_size, index_data, GL_STATIC_DRAW);
771 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
775 int initialize_monitor(Compositor *compositor, CompositedScreen *screen, XRRScreenResources *xrr_res, unsigned index)
777 CompositedMonitor *monitor;
778 XRROutputInfo *output;
782 monitor = &screen->monitors[index];
784 output = XRRGetOutputInfo(compositor->display, xrr_res, xrr_res->outputs[index]);
785 namelen = strlen(output->name);
786 monitor->name = (char *)malloc(namelen+1);
787 strcpy(monitor->name, output->name);
788 monitor->enabled = !!output->crtc;
789 if(!monitor->enabled)
791 XRRFreeOutputInfo(output);
792 monitor->vertex_buffer = 0;
793 monitor->index_buffer = 0;
794 monitor->vertex_array = 0;
795 monitor->geometry_data = NULL;
799 crtc = XRRGetCrtcInfo(compositor->display, xrr_res, output->crtc);
800 monitor->x = crtc->x;
801 monitor->y = crtc->y;
802 monitor->width = crtc->width;
803 monitor->height = crtc->height;
804 XRRFreeCrtcInfo(crtc);
805 XRRFreeOutputInfo(output);
807 monitor->keystone_vertical = 0.0f;
808 monitor->curvature_type = CYLINDRICAL;
809 monitor->curvature_depth = 0.0f;
810 monitor->vertical_center = 0.5f;
811 monitor->perspective = 1.0f;
813 create_geometry_correction(monitor);
814 update_monitor_vertices(screen, monitor);
819 CompositedMonitor *find_monitor_by_name(CompositedScreen *screen, char *name)
823 for(i=0; i<screen->nmonitors; ++i)
824 if(!strcmp(screen->monitors[i].name, name))
825 return &screen->monitors[i];
830 CompositedMonitor *find_monitor_by_name_global(Compositor *compositor, char *name, CompositedScreen **screen)
834 for(i=0; i<compositor->nscreens; ++i)
835 for(j=0; j<compositor->screens[i].nmonitors; ++j)
836 if(!strcmp(compositor->screens[i].monitors[j].name, name))
839 *screen = &compositor->screens[i];
840 return &compositor->screens[i].monitors[j];
848 void update_monitors(Compositor *compositor, CompositedScreen *screen)
850 XRRScreenResources *xrr_res;
853 xrr_res = XRRGetScreenResources(compositor->display, screen->root);
854 for(i=0; i<xrr_res->noutput; ++i)
856 XRROutputInfo *output;
857 CompositedMonitor *monitor;
861 output = XRRGetOutputInfo(compositor->display, xrr_res, xrr_res->outputs[i]);
862 monitor = find_monitor_by_name(screen, output->name);
866 was_enabled = monitor->enabled;
867 monitor->enabled = !!output->crtc;
868 if(!monitor->enabled)
870 XRRFreeOutputInfo(output);
872 free_geometry_correction(monitor);
876 crtc = XRRGetCrtcInfo(compositor->display, xrr_res, output->crtc);
877 monitor->x = crtc->x;
878 monitor->y = crtc->y;
879 monitor->width = crtc->width;
880 monitor->height = crtc->height;
881 XRRFreeCrtcInfo(crtc);
882 XRRFreeOutputInfo(output);
885 create_geometry_correction(monitor);
887 update_monitor_vertices(screen, monitor);
889 XRRFreeScreenResources(xrr_res);
892 void update_geometry_correction(Compositor *compositor, CompositedScreen *screen)
896 unsigned long overflow;
897 unsigned long names_length;
899 unsigned long values_length;
904 XGetWindowProperty(compositor->display, screen->root, compositor->monitors_atom, 0, 64, False, XA_STRING,
905 &prop_type, &prop_format, &names_length, &overflow, (unsigned char **)&names);
906 if(prop_type!=XA_STRING || prop_format!=8)
909 XGetWindowProperty(compositor->display, screen->root, compositor->correction_atom, 0, 64, False, XA_INTEGER,
910 &prop_type, &prop_format, &values_length, &overflow, (unsigned char **)&values);
911 if(prop_type!=XA_INTEGER || prop_format!=16)
917 use_gl(compositor, screen);
920 for(i=0; i*5+4<values_length; ++i)
922 CompositedMonitor *monitor;
924 if(name_ptr>=names+names_length)
927 monitor = find_monitor_by_name(screen, name_ptr);
930 monitor->keystone_vertical = values[i*5]/4096.0f;
931 monitor->curvature_type = values[i*5+1];
932 monitor->curvature_depth = values[i*5+2]/4096.0f;
933 monitor->vertical_center = values[i*5+3]/4096.0f;
934 monitor->perspective = values[i*5+4]/4096.0f;
937 update_monitor_vertices(screen, monitor);
940 name_ptr += strlen(name_ptr)+1;
947 void update_root_pixmap(Compositor *compositor, CompositedScreen *screen)
951 unsigned long overflow;
952 unsigned long length;
961 use_gl(compositor, screen);
963 if(screen->root_glx_pixmap)
965 glXDestroyPixmap(compositor->display, screen->root_glx_pixmap);
966 screen->root_glx_pixmap = None;
969 XGetWindowProperty(compositor->display, screen->root, compositor->root_pmap_atom, 0, 1, False, XA_PIXMAP,
970 &prop_type, &prop_format, &length, &overflow, (unsigned char **)&pixmap);
971 if(prop_type!=XA_PIXMAP || prop_format!=32)
973 screen->root_pixmap = None;
977 screen->root_pixmap = pixmap[0];
978 if(XGetGeometry(compositor->display, screen->root_pixmap, &root, &x, &y, &width, &height, &border, &depth))
979 screen->root_glx_pixmap = pixmap_to_glx_pixmap(compositor, screen, screen->root_pixmap);
981 screen->root_pixmap = None;
986 int initialize_screen(Compositor *compositor, unsigned number)
988 CompositedScreen *screen;
989 const char *extensions;
994 XRRScreenResources *xrr_res;
1000 screen = &compositor->screens[number];
1001 screen->number = number;
1003 extensions = glXQueryExtensionsString(compositor->display, screen->number);
1004 if(!strstr(extensions, "GLX_ARB_create_context"))
1005 return with_error("GLX_ARB_create_context is required");
1006 if(!strstr(extensions, "GLX_EXT_texture_from_pixmap"))
1007 return with_error("GLX_EXT_texture_from_pixmap is required");
1009 screen->root = RootWindow(compositor->display, screen->number);
1010 XSelectInput(compositor->display, screen->root, SubstructureNotifyMask|PropertyChangeMask);
1011 screen->overlay = XCompositeGetOverlayWindow(compositor->display, screen->root);
1012 XSelectInput(compositor->display, screen->overlay, StructureNotifyMask);
1013 XGetGeometry(compositor->display, screen->overlay, &dummy_root, &x, &y, &screen->width, &screen->height, &border, &depth);
1014 XShapeCombineRectangles(compositor->display, screen->overlay, ShapeInput, 0, 0, NULL, 0, ShapeSet, Unsorted);
1016 if(!initialize_gl(compositor, screen))
1019 use_gl(compositor, screen);
1021 if(!create_gl_resources(screen))
1024 xrr_res = XRRGetScreenResources(compositor->display, screen->root);
1025 screen->nmonitors = xrr_res->noutput;
1026 screen->monitors = (CompositedMonitor *)malloc(screen->nmonitors*sizeof(CompositedMonitor));
1027 for(i=0; i<screen->nmonitors; ++i)
1028 if(!initialize_monitor(compositor, screen, xrr_res, i))
1030 XRRFreeScreenResources(xrr_res);
1031 XRRSelectInput(compositor->display, screen->root, RRScreenChangeNotifyMask);
1033 screen->root_pixmap = None;
1034 screen->root_glx_pixmap = None;
1036 update_geometry_correction(compositor, screen);
1037 update_root_pixmap(compositor, screen);
1039 XQueryTree(compositor->display, screen->root, &dummy_root, &dummy_parent, &children, &nchildren);
1041 screen->windows = (CompositedWindow *)malloc(nchildren*sizeof(CompositedWindow));
1042 screen->nwindows = 0;
1043 screen->windows_capacity = nchildren;
1045 for(i=0; i<nchildren; ++i)
1046 add_window(compositor, screen, children[i]);
1055 int initialize_compositor(Compositor *compositor)
1063 compositor->display = XOpenDisplay(NULL);
1064 if(!compositor->display)
1065 return with_error("Could not open X display");
1067 XSetErrorHandler(&x_error_handler);
1069 if(!XCompositeQueryExtension(compositor->display, &event_base, &error_base))
1070 return with_error("XComposite is required but was not found");
1071 else if(!XCompositeQueryVersion(compositor->display, &major_ver, &minor_ver))
1072 return with_error("Cannot determine XComposite version");
1073 else if(major_ver==0 && minor_ver<3)
1074 return with_error("XComposite 0.3 or later is required");
1076 if(!glXQueryExtension(compositor->display, &event_base, &error_base))
1077 return with_error("GLX is required but was not found");
1078 else if(!glXQueryVersion(compositor->display, &major_ver, &minor_ver))
1079 return with_error("Cannot determine GLX version");
1080 else if(major_ver<1 || (major_ver==1 && minor_ver<4))
1081 return with_error("GLX 1.4 or later is required");
1083 if(!XDamageQueryExtension(compositor->display, &compositor->damage_event, &error_base))
1084 return with_error("XDamage is required but was not found");
1085 else if(!XDamageQueryVersion(compositor->display, &major_ver, &minor_ver))
1086 return with_error("Cannot determine XDamage version");
1087 else if(major_ver<1)
1088 return with_error("XDamage 1.0 or later is required");
1090 if(!XShapeQueryExtension(compositor->display, &compositor->shape_event, &error_base))
1091 return with_error("XShape is required but was not found");
1092 else if(!XShapeQueryVersion(compositor->display, &major_ver, &minor_ver))
1093 return with_error("Cannot determine XShape version");
1094 else if(major_ver<1 || (major_ver==1 && minor_ver<1))
1095 return with_error("XShape 1.1 or later is required");
1097 if(!XRRQueryExtension(compositor->display, &compositor->randr_event, &error_base))
1098 return with_error("XRandR is required but was not found");
1099 else if(!XRRQueryVersion(compositor->display, &major_ver, &minor_ver))
1100 return with_error("Cannot determine XRandR version");
1101 else if(major_ver<1 || (major_ver==1 && minor_ver<2))
1102 return with_error("XRandR 1.2 or later is required");
1104 compositor->glXCreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)glXGetProcAddress((unsigned char *)"glXCreateContextAttribsARB");
1105 compositor->glXBindTexImageEXT = (PFNGLXBINDTEXIMAGEEXTPROC)glXGetProcAddress((unsigned char *)"glXBindTexImageEXT");
1106 compositor->glXReleaseTexImageEXT = (PFNGLXRELEASETEXIMAGEEXTPROC)glXGetProcAddress((unsigned char *)"glXReleaseTexImageEXT");
1108 compositor->root_pmap_atom = XInternAtom(compositor->display, "_XROOTPMAP_ID", False);
1109 compositor->correction_atom = XInternAtom(compositor->display, "_MSP_GEOMETRY_CORRECTION", False);
1110 compositor->monitors_atom = XInternAtom(compositor->display, "_MSP_GEOMETRY_CORRECTION_MONITORS", False);
1111 compositor->geometry_data_atom = XInternAtom(compositor->display, "_MSP_GEOMETRY_CORRECTION_DATA", False);
1113 compositor->nscreens = ScreenCount(compositor->display);
1114 compositor->screens = (CompositedScreen *)malloc(compositor->nscreens*sizeof(CompositedScreen));
1115 for(i=0; i<compositor->nscreens; ++i)
1116 if(!initialize_screen(compositor, i))
1119 compositor->selection_window = XCreateWindow(compositor->display, compositor->screens[0].root, 0, 0, 1, 1, 0, CopyFromParent, InputOutput, CopyFromParent, 0, NULL);
1120 XSetSelectionOwner(compositor->display, compositor->geometry_data_atom, compositor->selection_window, CurrentTime);
1122 compositor->dirty = 1;
1127 void shutdown_screen(Compositor *compositor, CompositedScreen *screen)
1131 use_gl(compositor, screen);
1133 for(i=0; i<screen->nwindows; ++i)
1135 glDeleteTextures(1, &screen->windows[i].texture);
1136 glDeleteTextures(1, &screen->windows[i].mask_texture);
1137 if(screen->windows[i].pixmap)
1139 glXDestroyPixmap(compositor->display, screen->windows[i].glx_pixmap);
1140 XFreePixmap(compositor->display, screen->windows[i].pixmap);
1141 XDamageDestroy(compositor->display, screen->windows[i].damage);
1145 for(i=0; i<screen->nmonitors; ++i)
1147 free(screen->monitors[i].name);
1148 if(screen->monitors[i].enabled)
1149 free_geometry_correction(&screen->monitors[i]);
1152 glDeleteTextures(1, &screen->root_texture);
1153 glXDestroyPixmap(compositor->display, screen->root_glx_pixmap);
1155 glDeleteBuffers(1, &screen->window_vertex_buffer);
1156 glDeleteVertexArrays(1, &screen->window_vertex_array);
1157 glDeleteFramebuffers(1, &screen->framebuffer);
1158 glDeleteTextures(1, &screen->fb_texture);
1159 glDeleteProgram(screen->program);
1160 glDeleteProgram(screen->masked_program);
1162 glDeleteShader(screen->shaders[i]);
1164 glXMakeContextCurrent(compositor->display, None, None, NULL);
1165 glXDestroyContext(compositor->display, screen->glx_context);
1166 glXDestroyWindow(compositor->display, screen->glx_window);
1167 XDestroyWindow(compositor->display, screen->render_window);
1169 XCompositeReleaseOverlayWindow(compositor->display, screen->overlay);
1171 free(screen->windows);
1172 free(screen->monitors);
1175 void shutdown_compositor(Compositor *compositor)
1179 for(i=0; i<compositor->nscreens; ++i)
1180 shutdown_screen(compositor, &compositor->screens[i]);
1181 free(compositor->screens);
1183 XDestroyWindow(compositor->display, compositor->selection_window);
1185 XCloseDisplay(compositor->display);
1188 void mark_dirty(Compositor *compositor, CompositedScreen *screen)
1190 compositor->dirty = 1;
1194 void process_create_window_event(Compositor *compositor, XCreateWindowEvent *event)
1196 CompositedScreen *screen;
1198 if((screen = find_screen_by_root(compositor, event->parent)))
1199 add_window(compositor, screen, event->window);
1202 void process_destroy_window_event(Compositor *compositor, XDestroyWindowEvent *event)
1204 CompositedScreen *screen;
1205 CompositedWindow *window;
1207 if((screen = find_screen_by_root(compositor, event->event)))
1208 if((window = find_window(screen, event->window)))
1210 use_gl(compositor, screen);
1211 remove_window(compositor, screen, window, 1);
1215 void process_map_event(Compositor *compositor, XMapEvent *event)
1217 CompositedScreen *screen;
1218 CompositedWindow *window;
1220 screen = find_screen_by_root(compositor, event->event);
1224 window = find_window(screen, event->window);
1228 window->map_state = IsViewable;
1229 window->recreate_pixmap = 1;
1230 window->recreate_mask = 1;
1232 mark_dirty(compositor, screen);
1235 void process_unmap_event(Compositor *compositor, XUnmapEvent *event)
1237 CompositedScreen *screen;
1238 CompositedWindow *window;
1240 screen = find_screen_by_root(compositor, event->event);
1244 window = find_window(screen, event->window);
1246 window->map_state = IsUnviewable;
1248 mark_dirty(compositor, screen);
1251 void process_reparent_event(Compositor *compositor, XReparentEvent *event)
1253 CompositedScreen *screen;
1254 CompositedWindow *window;
1256 screen = find_screen_by_root(compositor, event->event);
1260 if(event->parent==screen->root)
1261 window = add_window(compositor, screen, event->window);
1264 window = find_window(screen, event->window);
1268 remove_window(compositor, screen, window, 0);
1271 if(window && window->map_state==IsViewable)
1272 mark_dirty(compositor, screen);
1275 void process_configure_event(Compositor *compositor, XConfigureEvent *event)
1277 CompositedScreen *screen;
1278 CompositedWindow *window;
1280 screen = find_screen_by_root(compositor, event->event);
1284 if(event->window==screen->overlay)
1286 screen->width = event->width;
1287 screen->height = event->height;
1289 XResizeWindow(compositor->display, screen->render_window, screen->width, screen->height);
1290 use_gl(compositor, screen);
1291 glBindTexture(GL_TEXTURE_2D, screen->fb_texture);
1292 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, screen->width, screen->height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
1293 glBindTexture(GL_TEXTURE_2D, 0);
1297 window = find_window(screen, event->window);
1301 window->x = event->x;
1302 window->y = event->y;
1303 if((unsigned)event->width!=window->width || (unsigned)event->height!=window->height || (unsigned)event->border_width!=window->border)
1305 window->width = event->width;
1306 window->height = event->height;
1307 window->border = event->border_width;
1308 window->recreate_pixmap = 1;
1310 reorder_window(screen, window, event->above);
1312 if(window->map_state==IsViewable)
1313 mark_dirty(compositor, screen);
1316 void process_property_event(Compositor *compositor, XPropertyEvent *event)
1318 CompositedScreen *screen;
1320 screen = find_screen_by_root(compositor, event->window);
1324 if(event->atom==compositor->correction_atom)
1325 update_geometry_correction(compositor, screen);
1326 else if(event->atom==compositor->root_pmap_atom)
1327 update_root_pixmap(compositor, screen);
1330 void process_selection_request_event(Compositor *compositor, XSelectionRequestEvent *event)
1334 unsigned long overflow;
1335 unsigned long names_length;
1336 XSelectionEvent notify;
1338 if(event->selection==compositor->geometry_data_atom)
1341 CompositedMonitor *monitor;
1343 XGetWindowProperty(compositor->display, event->requestor, event->property, 0, 64, False, XA_STRING,
1344 &prop_type, &prop_format, &names_length, &overflow, (unsigned char **)&monitor_name);
1345 if(prop_type!=XA_STRING || prop_format!=8)
1348 monitor = find_monitor_by_name_global(compositor, monitor_name, NULL);
1349 if(monitor && monitor->enabled)
1350 XChangeProperty(compositor->display, event->requestor, event->property, XA_INTEGER, 16, PropModeReplace, (unsigned char *)monitor->geometry_data, monitor->geometry_data_size);
1352 notify.type = SelectionNotify;
1353 notify.requestor = event->requestor;
1354 notify.selection = event->selection;
1355 notify.target = event->target;
1356 notify.property = (monitor ? event->property : None);
1357 notify.time = event->time;
1358 XSendEvent(compositor->display, event->requestor, False, 0, (XEvent *)¬ify);
1362 void process_damage_event(Compositor *compositor, XDamageNotifyEvent *event)
1364 CompositedScreen *screen;
1365 CompositedWindow *window;
1367 window = find_window_global(compositor, event->drawable, &screen);
1368 if(window && window->map_state==IsViewable)
1369 mark_dirty(compositor, screen);
1372 void process_shape_event(Compositor *compositor, XShapeEvent *event)
1374 CompositedScreen *screen;
1375 CompositedWindow *window;
1377 if(event->kind!=ShapeBounding)
1380 window = find_window_global(compositor, event->window, &screen);
1381 if(window && window->map_state==IsViewable)
1383 window->recreate_mask = 1;
1384 mark_dirty(compositor, screen);
1388 void process_randr_event(Compositor *compositor, XRRScreenChangeNotifyEvent *event)
1390 CompositedScreen *screen;
1392 if((screen = find_screen_by_root(compositor, event->root)))
1393 update_monitors(compositor, screen);
1396 void process_events(Compositor *compositor)
1402 while((pending || !compositor->dirty) && !terminate_requested)
1405 pending = XPending(compositor->display);
1407 XNextEvent(compositor->display, &event);
1414 process_create_window_event(compositor, &event.xcreatewindow);
1417 process_destroy_window_event(compositor, &event.xdestroywindow);
1420 process_map_event(compositor, &event.xmap);
1423 process_unmap_event(compositor, &event.xunmap);
1425 case ReparentNotify:
1426 process_reparent_event(compositor, &event.xreparent);
1428 case ConfigureNotify:
1429 process_configure_event(compositor, &event.xconfigure);
1431 case PropertyNotify:
1432 process_property_event(compositor, &event.xproperty);
1434 case SelectionRequest:
1435 process_selection_request_event(compositor, &event.xselectionrequest);
1438 if(event.type==compositor->damage_event+XDamageNotify)
1439 process_damage_event(compositor, (XDamageNotifyEvent *)&event);
1440 else if(event.type==compositor->shape_event+ShapeNotify)
1441 process_shape_event(compositor, (XShapeEvent *)&event);
1442 else if(event.type==compositor->randr_event+RRScreenChangeNotify)
1443 process_randr_event(compositor, (XRRScreenChangeNotifyEvent *)&event);
1448 void refresh_screen(Compositor *compositor, CompositedScreen *screen)
1453 for(i=0; i<screen->nwindows; ++i)
1454 if(screen->windows[i].map_state==IsViewable)
1455 XDamageSubtract(compositor->display, screen->windows[i].damage, None, None);
1458 use_gl(compositor, screen);
1460 glViewport(0, 0, screen->width, screen->height);
1461 glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
1462 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, screen->framebuffer);
1465 glBindVertexArray(screen->window_vertex_array);
1467 if(screen->root_pixmap)
1470 glUseProgram(screen->program);
1471 glBindTexture(GL_TEXTURE_2D, screen->root_texture);
1472 compositor->glXBindTexImageEXT(compositor->display, screen->root_glx_pixmap, GLX_FRONT_LEFT_EXT, NULL);
1473 glUniform4f(screen->geometry_loc, 0.0f, 0.0f, 1.0f, 1.0f);
1474 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1475 compositor->glXReleaseTexImageEXT(compositor->display, screen->root_glx_pixmap, GLX_FRONT_LEFT_EXT);
1478 glClear(GL_COLOR_BUFFER_BIT);
1480 for(i=0; i<screen->nwindows; ++i)
1482 CompositedWindow *window;
1484 window = &screen->windows[i];
1485 if(window->map_state!=IsViewable)
1488 if(window->use_mask!=use_mask)
1490 use_mask = window->use_mask;
1491 glUseProgram(use_mask ? screen->masked_program : screen->program);
1494 if(window->use_mask)
1496 glActiveTexture(GL_TEXTURE1);
1497 glBindTexture(GL_TEXTURE_2D, window->mask_texture);
1498 glActiveTexture(GL_TEXTURE0);
1501 if(window->recreate_pixmap)
1502 create_window_pixmap(compositor, screen, window);
1503 if(window->recreate_mask)
1504 update_window_mask(compositor, window);
1506 glBindTexture(GL_TEXTURE_2D, window->texture);
1507 compositor->glXBindTexImageEXT(compositor->display, window->glx_pixmap, GLX_FRONT_LEFT_EXT, NULL);
1508 glUniform4f((use_mask ? screen->masked_geometry_loc : screen->geometry_loc),
1509 (float)window->x/screen->width, 1.0f-(float)(window->y+window->height)/screen->height,
1510 (float)(window->width+2*window->border)/screen->width, (float)(window->height+2*window->border)/screen->height);
1511 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1512 compositor->glXReleaseTexImageEXT(compositor->display, window->glx_pixmap, GLX_FRONT_LEFT_EXT);
1515 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
1516 glClear(GL_COLOR_BUFFER_BIT);
1517 glBindTexture(GL_TEXTURE_2D, screen->fb_texture);
1518 glEnable(GL_PRIMITIVE_RESTART);
1519 glPrimitiveRestartIndex(0xFFFF);
1521 glUseProgram(screen->program);
1523 for(i=0; i<screen->nmonitors; ++i)
1525 CompositedMonitor *monitor = &screen->monitors[i];
1526 if(!monitor->enabled)
1529 glUniform4f(screen->geometry_loc,
1530 (float)monitor->x/screen->width, 1.0f-(float)(monitor->y+monitor->height)/screen->height,
1531 (float)monitor->width/screen->width, (float)monitor->height/screen->height);
1533 glBindVertexArray(monitor->vertex_array);
1534 glDrawElements(GL_TRIANGLE_STRIP, monitor->nelements, GL_UNSIGNED_SHORT, NULL);
1537 glBindVertexArray(0);
1539 glXSwapBuffers(compositor->display, screen->glx_window);
1544 void refresh_all_screens(Compositor *compositor)
1548 for(i=0; i<compositor->nscreens; ++i)
1550 CompositedScreen *screen = &compositor->screens[i];
1552 refresh_screen(compositor, screen);
1555 compositor->dirty = 0;
1558 void sighandler(int sig)
1560 terminate_requested = 1;
1566 Compositor compositor;
1568 signal(SIGINT, &sighandler);
1569 signal(SIGTERM, &sighandler);
1571 if(!initialize_compositor(&compositor))
1574 while(!terminate_requested)
1576 process_events(&compositor);
1577 if(compositor.dirty && !terminate_requested)
1578 refresh_all_screens(&compositor);
1581 shutdown_compositor(&compositor);