+void update_monitor_vertices(CompositedScreen *screen, CompositedMonitor *monitor)
+{
+ unsigned t;
+ unsigned data_size;
+ float *vertex_data;
+ unsigned short *index_data;
+ unsigned x, y;
+ unsigned i;
+ float aspect;
+ float cyl_radius;
+ float cyl_arc;
+ float sin_ksv;
+ float cos_ksv;
+ float distance;
+ float eye[3];
+ float look[3];
+
+ t = monitor->tessellation;
+
+ data_size = (t+1)*(t+1)*4*sizeof(float);
+ vertex_data = (float *)malloc(data_size);
+
+ aspect = (float)monitor->width/monitor->height;
+
+ if(monitor->cylinder_depth)
+ {
+ cyl_radius = (monitor->cylinder_depth*monitor->cylinder_depth+0.25f)/(2.0f*monitor->cylinder_depth);
+ cyl_arc = 2.0f*asin(0.5f/cyl_radius);
+ }
+
+ sin_ksv = monitor->keystone_vertical/sqrt(1.0f+monitor->keystone_vertical*monitor->keystone_vertical);
+ cos_ksv = sqrt(1.0f-sin_ksv*sin_ksv);
+ distance = monitor->perspective+sin_ksv*((sin_ksv>0)-monitor->vertical_center)/aspect;
+
+ eye[0] = 0.0f;
+ eye[1] = (monitor->vertical_center-0.5f)/aspect+sin_ksv*distance;
+ eye[2] = cos_ksv*distance;
+
+ look[0] = 0.0f;
+ look[1] = -sin_ksv;
+ look[2] = -cos_ksv;
+
+ for(y=0; y<=t; ++y)
+ for(x=0; x<=t; ++x)
+ {
+ float *v;
+
+ v = vertex_data+(y*(t+1)+x)*3;
+ v[0] = (float)x/t-0.5f;
+ v[1] = ((float)y/t-0.5f)/aspect;
+ v[2] = 0;
+ if(monitor->cylinder_depth)
+ {
+ v[2] = (1.0f-cos(v[0]*cyl_arc))*cyl_radius-monitor->cylinder_depth;
+ v[0] = sin(v[0]*cyl_arc)*cyl_radius;
+ }
+ }
+
+ monitor->geometry_data[0] = t;
+ for(i=0; i<3; ++i)
+ monitor->geometry_data[1+i] = eye[i]*10000;
+ for(y=0; y<2; ++y)
+ for(x=0; x<2; ++x)
+ {
+ i = 1+(1+y*2+x)*3;
+ monitor->geometry_data[i] = ((x-0.5f)*distance/monitor->perspective)*10000;
+ monitor->geometry_data[i+1] = (eye[1]+look[1]*distance-(y-monitor->vertical_center)*look[2]*distance/monitor->perspective/aspect)*10000;
+ monitor->geometry_data[i+2] = (eye[2]+look[2]*distance+(y-monitor->vertical_center)*look[1]*distance/monitor->perspective/aspect)*10000;
+ }
+ for(i=0; i<(t+1)*(t+1)*3; ++i)
+ monitor->geometry_data[16+i] = vertex_data[i]*10000;
+
+ for(y=t; y<=t; --y)
+ for(x=t; x<=t; --x)
+ {
+ float *v;
+ float px, py, pz;
+ float scale;
+
+ v = vertex_data+(y*(t+1)+x)*3;
+ px = v[0]-eye[0];
+ py = (v[0]-eye[0])*look[0] - (v[1]-eye[1])*look[2] + (v[2]-eye[2])*look[1];
+ pz = (v[0]-eye[0])*look[0] + (v[1]-eye[1])*look[1] + (v[2]-eye[2])*look[2];
+ scale = monitor->perspective/pz;
+
+ v = vertex_data+(y*(t+1)+x)*4;
+ v[0] = px*scale+0.5f;
+ v[1] = py*aspect*scale+monitor->vertical_center;
+ v[2] = (monitor->x+(float)x*monitor->width/t)/screen->width;
+ v[3] = 1.0f-(monitor->y+(1.0f-(float)y/t)*monitor->height)/screen->height;
+ }
+
+ glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
+ glBufferData(GL_ARRAY_BUFFER, data_size, vertex_data, GL_STATIC_DRAW);
+ glBindBuffer(GL_ARRAY_BUFFER, 0);
+ free(vertex_data);
+
+ monitor->nelements = t*((t+1)*2+1)-1;
+ data_size = monitor->nelements*sizeof(unsigned short);
+ index_data = (unsigned short *)malloc(data_size);
+ i = 0;
+ for(y=0; y<t; ++y)
+ {
+ if(y>0)
+ index_data[i++] = 0xFFFF;
+ for(x=0; x<=t; ++x)
+ {
+ index_data[i++] = (y+1)*(t+1)+x;
+ index_data[i++] = y*(t+1)+x;
+ }
+ }
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
+ glBufferData(GL_ELEMENT_ARRAY_BUFFER, data_size, index_data, GL_STATIC_DRAW);
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+ free(index_data);
+}
+
+int initialize_monitor(Compositor *compositor, CompositedScreen *screen, XRRScreenResources *xrr_res, unsigned index)
+{
+ CompositedMonitor *monitor;
+ XRROutputInfo *output;
+ int namelen;
+ XRRCrtcInfo *crtc;
+ unsigned buffers[2];
+ unsigned stride;
+
+ monitor = &screen->monitors[index];
+
+ output = XRRGetOutputInfo(compositor->display, xrr_res, xrr_res->outputs[index]);
+ namelen = strlen(output->name);
+ monitor->name = (char *)malloc(namelen+1);
+ strcpy(monitor->name, output->name);
+ monitor->enabled = !!output->crtc;
+ if(!monitor->enabled)
+ {
+ XRRFreeOutputInfo(output);
+ monitor->geometry_data = NULL;
+ return 1;
+ }
+
+ crtc = XRRGetCrtcInfo(compositor->display, xrr_res, output->crtc);
+ monitor->x = crtc->x;
+ monitor->y = crtc->y;
+ monitor->width = crtc->width;
+ monitor->height = crtc->height;
+ XRRFreeCrtcInfo(crtc);
+ XRRFreeOutputInfo(output);
+
+ monitor->keystone_vertical = 0.0f;
+ monitor->cylinder_depth = 0.0f;
+ monitor->vertical_center = 0.5f;
+ monitor->perspective = 1.0f;
+
+ glGenBuffers(2, buffers);
+ monitor->vertex_buffer = buffers[0];
+ monitor->index_buffer = buffers[1];
+
+ monitor->tessellation = 50;
+ monitor->geometry_data_size = (monitor->tessellation+1)*(monitor->tessellation+1)*3+16;
+ monitor->geometry_data = (short *)malloc(monitor->geometry_data_size*sizeof(short));
+ update_monitor_vertices(screen, monitor);
+ stride = 4*sizeof(float);
+
+ glGenVertexArrays(1, &monitor->vertex_array);
+ glBindVertexArray(monitor->vertex_array);
+ glBindBuffer(GL_ARRAY_BUFFER, monitor->vertex_buffer);
+ glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, NULL);
+ glEnableVertexAttribArray(0);
+ glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void *)(2*sizeof(float)));
+ glEnableVertexAttribArray(1);
+ glBindBuffer(GL_ARRAY_BUFFER, 0);
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, monitor->index_buffer);
+ glBindVertexArray(0);
+
+ return 1;
+}
+
+CompositedMonitor *find_monitor_by_name(CompositedScreen *screen, char *name)
+{
+ unsigned i;
+
+ for(i=0; i<screen->nmonitors; ++i)
+ if(!strcmp(screen->monitors[i].name, name))
+ return &screen->monitors[i];
+
+ return NULL;
+}
+
+CompositedMonitor *find_monitor_by_name_global(Compositor *compositor, char *name, CompositedScreen **screen)