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libglfork.cpp
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libglfork.cpp
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#include <dlfcn.h>
#include <pthread.h>
#include <semaphore.h>
#include <time.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <cassert>
#include <map>
#include <string>
#include <X11/Xatom.h>
#pragma GCC visibility push(default)
#define GLX_GLXEXT_PROTOTYPES
#define GL_GLEXT_PROTOTYPES
#include <GL/glx.h>
#pragma GCC visibility pop
#define primus_print(c, ...) do { if (c) fprintf(stderr, "primus: " __VA_ARGS__); } while (0)
#define die_if(cond, ...) do {if (cond) {primus_print(true, "fatal: " __VA_ARGS__); exit(1);} } while (0)
#define primus_warn(...) primus_print(primus.loglevel >= 1, "warning: " __VA_ARGS__)
#define primus_perf(...) primus_print(primus.loglevel >= 2, "profiling: " __VA_ARGS__)
// Try to load any of the colon-separated libraries
static void *mdlopen(const char *paths, int flag)
{
char *p = strdupa(paths);
char errors[1024], *errors_ptr = errors, *errors_end = errors + 1024;
for (char *c = p; c; p = c + 1)
{
if ((c = strchr(p, ':')))
*c = 0;
die_if(p[0] != '/', "need absolute library path: %s\n", p);
void *handle = dlopen(p, flag);
if (handle)
return handle;
errors_ptr += snprintf(errors_ptr, errors_end - errors_ptr, "%s\n", dlerror());
}
die_if(true, "failed to load any of the libraries: %s\n%s", paths, errors);
}
static void *real_dlsym(void *handle, const char *symbol)
{
typedef void* (*dlsym_fn)(void *, const char*);
static dlsym_fn pdlsym = (dlsym_fn) dlsym(dlopen("libdl.so.2", RTLD_LAZY), "dlsym");
return pdlsym(handle, symbol);
}
// Pointers to implemented/forwarded GLX and OpenGL functions
struct CapturedFns {
void *handle;
// Declare functions as fields of the struct
#define DEF_GLX_PROTO(ret, name, args, ...) ret (*name) args;
#include "glx-reimpl.def"
#include "glx-dpyredir.def"
#include "glxext-reimpl.def"
#include "gl-passthru.def"
#include "gl-needed.def"
#undef DEF_GLX_PROTO
CapturedFns(const char *lib)
{
handle = mdlopen(lib, RTLD_LAZY);
#define DEF_GLX_PROTO(ret, name, args, ...) name = (ret (*) args)real_dlsym(handle, #name);
#include "glx-reimpl.def"
#include "glx-dpyredir.def"
#undef DEF_GLX_PROTO
#define DEF_GLX_PROTO(ret, name, args, ...) name = (ret (*) args)this->glXGetProcAddress((GLubyte*)#name);
#include "glxext-reimpl.def"
#include "gl-passthru.def"
#include "gl-needed.def"
#undef DEF_GLX_PROTO
}
~CapturedFns()
{
dlclose(handle);
}
};
// Drawable tracking info
struct DrawableInfo {
// Only XWindow is not explicitely created via GLX
enum {XWindow, Window, Pixmap, Pbuffer} kind;
GLXFBConfig fbconfig;
GLXPbuffer pbuffer;
Drawable window;
int width, height;
enum ReinitTodo {NONE, RESIZE, SHUTDOWN} reinit;
GLvoid *pixeldata;
GLsync sync;
GLXContext actx;
struct {
pthread_t worker;
sem_t acqsem, relsem;
ReinitTodo reinit;
void spawn_worker(GLXDrawable draw, void* (*work)(void*))
{
reinit = RESIZE;
sem_init(&acqsem, 0, 0);
sem_init(&relsem, 0, 0);
pthread_create(&worker, NULL, work, (void*)draw);
}
void reap_worker()
{
//pthread_cancel(worker);
pthread_join(worker, NULL);
sem_destroy(&relsem);
sem_destroy(&acqsem);
worker = 0;
}
} r, d;
void reap_workers()
{
if (r.worker)
{
r.reinit = SHUTDOWN;
sem_post(&r.acqsem);
sem_wait(&r.relsem);
r.reap_worker();
d.reap_worker();
}
}
void update_geometry(int width, int height)
{
if (this->width == width && this->height == height)
return;
this->width = width; this->height = height;
__sync_synchronize();
reinit = RESIZE;
}
~DrawableInfo();
};
struct DrawablesInfo: public std::map<GLXDrawable, DrawableInfo> {
bool known(GLXDrawable draw)
{
return this->find(draw) != this->end();
}
};
struct ContextInfo {
GLXFBConfig fbconfig;
int sharegroup;
};
struct ContextsInfo: public std::map<GLXContext, ContextInfo> {
void record(GLXContext ctx, GLXFBConfig config, GLXContext share)
{
static int nsharegroups;
int sharegroup = share ? (*this)[share].sharegroup : nsharegroups++;
(*this)[ctx] = (ContextInfo){config, sharegroup};
}
};
// Shorthand for obtaining compile-time configurable value that can be
// overridden by environment
#define getconf(V) (getenv(#V) ? getenv(#V) : V)
// Runs before all other initialization takes place
struct EarlyInitializer {
EarlyInitializer(const char **adpy_strp, const char **libgla_strp)
{
#ifdef BUMBLEBEE_SOCKET
// Signal the Bumblebee daemon to bring up secondary X
errno = 0;
int sock = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, getconf(BUMBLEBEE_SOCKET), sizeof(addr.sun_path));
connect(sock, (struct sockaddr *)&addr, sizeof(addr));
die_if(errno, "failed to connect to Bumblebee daemon: %s\n", strerror(errno));
static char c[256];
if (!getenv("PRIMUS_DISPLAY"))
{
send(sock, "Q VirtualDisplay", strlen("Q VirtualDisplay") + 1, 0);
recv(sock, &c, 255, 0);
die_if(memcmp(c, "Value: ", strlen("Value: ")), "unexpected query response\n");
*strchrnul(c, '\n') = 0;
*adpy_strp = strdup(c + 7);
}
if (!getenv("PRIMUS_libGLa"))
{
send(sock, "Q LibraryPath", strlen("Q LibraryPath") + 1, 0);
recv(sock, &c, 255, 0);
die_if(memcmp(c, "Value: ", strlen("Value: ")), "unexpected query response\n");
*strchrnul(c, '\n') = 0;
int npaths = 0;
for (char *p = c + 7; *p; npaths++, p = strchrnul(p + 1, ':'));
if (npaths)
{
char *bblibs = new char[strlen(c + 7) + npaths * strlen("/libGL.so.1") + 1], *b = bblibs, *n, *p;
for (p = c + 7; *p; p = n)
{
n = strchrnul(p + 1, ':');
b += sprintf(b, "%.*s/libGL.so.1", (int)(n - p), p);
}
*libgla_strp = bblibs;
}
}
send(sock, "C", 1, 0);
recv(sock, &c, 255, 0);
die_if(c[0] == 'N', "Bumblebee daemon reported: %s\n", c + 5);
die_if(c[0] != 'Y', "failure contacting Bumblebee daemon\n");
// the socket will be closed when the application quits, then bumblebee will shut down the secondary X
#else
#warning Building without Bumblebee daemon support
#endif
}
};
// Process-wide data
static struct PrimusInfo {
const char *adpy_str, *libgla_str;
EarlyInitializer ei;
// Readback-display synchronization method
// 0: no sync, 1: D lags behind one frame, 2: fully synced
int sync;
// 0: only errors, 1: warnings, 2: profiling
int loglevel;
// 0: autodetect, 1: texture, 2: PBO glDrawPixels
int dispmethod;
// sleep ratio in readback thread, percent
int autosleep;
// The "accelerating" X display
Display *adpy;
// The "displaying" X display. The same as the application is using, but
// primus opens its own connection.
Display *ddpy;
// An artifact: primus needs to make symbols from libglapi.so globally
// visible before loading Mesa
const void *needed_global;
CapturedFns afns;
CapturedFns dfns;
// FIXME: there are race conditions in accesses to these
DrawablesInfo drawables;
ContextsInfo contexts;
GLXFBConfig *dconfigs;
PrimusInfo():
adpy_str(getconf(PRIMUS_DISPLAY)),
libgla_str(getconf(PRIMUS_libGLa)),
ei(&adpy_str, &libgla_str),
sync(atoi(getconf(PRIMUS_SYNC))),
loglevel(atoi(getconf(PRIMUS_VERBOSE))),
dispmethod(atoi(getconf(PRIMUS_UPLOAD))),
autosleep(atoi(getconf(PRIMUS_SLEEP))),
adpy(XOpenDisplay(adpy_str)),
ddpy(XOpenDisplay(NULL)),
needed_global(dlopen(getconf(PRIMUS_LOAD_GLOBAL), RTLD_LAZY | RTLD_GLOBAL)),
afns(libgla_str),
dfns(getconf(PRIMUS_libGLd))
{
die_if(!adpy, "failed to open secondary X display\n");
die_if(!ddpy, "failed to open main X display\n");
die_if(!needed_global, "failed to load PRIMUS_LOAD_GLOBAL\n");
int ncfg, attrs[] = {GLX_DOUBLEBUFFER, GL_TRUE, None};
dconfigs = dfns.glXChooseFBConfig(ddpy, 0, attrs, &ncfg);
die_if(!ncfg, "broken GLX on main X display\n");
}
} primus;
// Thread-specific data
static __thread struct {
Display *dpy;
GLXDrawable drawable, read_drawable;
void make_current(Display *dpy, GLXDrawable draw, GLXDrawable read)
{
this->dpy = dpy;
this->drawable = draw;
this->read_drawable = read;
}
} tsdata;
// Profiler
struct Profiler {
const char *name;
const char * const *state_names;
double state_time[6], prev_timestamp, print_timestamp;
int state, nframes, width, height;
static double get_timestamp()
{
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC, &tp);
return tp.tv_sec + 1e-9 * tp.tv_nsec;
}
Profiler(const char *name, const char * const *state_names):
name(name),
state_names(state_names),
state(0), nframes(0), width(0), height(0)
{
memset(state_time, 0, sizeof(state_time));
prev_timestamp = print_timestamp = get_timestamp();
}
void tick(bool state_reset = false)
{
if (primus.loglevel < 2)
return;
double timestamp = get_timestamp();
assert(state_reset || state_names[state]);
if (state_reset)
state = 0;
assert(state * sizeof(state_time[0]) < sizeof(state_time));
state_time[state++] += timestamp - prev_timestamp;
prev_timestamp = timestamp;
if (state_names[state])
return;
nframes++;
// check if it's time to print again
double period = timestamp - print_timestamp; // time since we printed
if (period < 5)
return;
// construct output
char buf[128], *cbuf = buf, *end = buf+128;
for (int i = 0; i < state; i++)
cbuf += snprintf(cbuf, end - cbuf, ", %.1f%% %s", 100 * state_time[i] / period, state_names[i]);
primus_perf("%s: %dx%d, %.1f fps%s\n", name, width, height, nframes / period, buf);
// start counting again
print_timestamp = timestamp;
nframes = 0;
memset(state_time, 0, sizeof(state_time));
}
};
// Find out the dimensions of the window
static void note_geometry(Display *dpy, Drawable draw, int *width, int *height)
{
Window root;
int x, y;
unsigned bw, d;
XGetGeometry(dpy, draw, &root, &x, &y, (unsigned *)width, (unsigned *)height, &bw, &d);
}
static bool test_drawpixels_fast(Display *dpy, GLXContext ctx)
{
int width = 1920, height = 1080;
int pbattrs[] = {GLX_PBUFFER_WIDTH, width, GLX_PBUFFER_HEIGHT, height, GLX_PRESERVED_CONTENTS, True, None};
GLXPbuffer pbuffer = primus.dfns.glXCreatePbuffer(dpy, primus.dconfigs[0], pbattrs);
primus.dfns.glXMakeCurrent(dpy, pbuffer, ctx);
GLuint pbo;
primus.dfns.glGenBuffers(1, &pbo);
primus.dfns.glBindBuffer(GL_PIXEL_UNPACK_BUFFER_EXT, pbo);
primus.dfns.glBufferData(GL_PIXEL_UNPACK_BUFFER_EXT, width*height*4, NULL, GL_STREAM_DRAW);
void *pixeldata = malloc(width*height*4);
double end = 0.2 + Profiler::get_timestamp();
int iters = 0;
do {
primus.dfns.glBufferSubData(GL_PIXEL_UNPACK_BUFFER_EXT, 0, width*height*4, pixeldata);
primus.dfns.glDrawPixels(width, height, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
primus.dfns.glXSwapBuffers(dpy, pbuffer);
iters++;
} while (end > Profiler::get_timestamp());
free(pixeldata);
primus.dfns.glDeleteBuffers(1, &pbo);
primus.dfns.glXDestroyPbuffer(dpy, pbuffer);
bool is_fast = iters >= 12;
primus_perf("upload autodetection: will use %s path (%d iters)\n", is_fast ? "PBO" : "texture", iters);
return is_fast;
}
static void* display_work(void *vd)
{
GLXDrawable drawable = (GLXDrawable)vd;
DrawableInfo &di = primus.drawables[drawable];
int width, height;
static const float quad_vertex_coords[] = {-1, -1, -1, 1, 1, 1, 1, -1};
static const float quad_texture_coords[] = { 0, 0, 0, 1, 1, 1, 1, 0};
GLuint textures[2] = {0}, pbos[2] = {0};
int ctex = 0;
static const char *state_names[] = {"wait", "upload", "draw+swap", NULL};
Profiler profiler("display", state_names);
Display *ddpy = XOpenDisplay(NULL);
assert(di.kind == di.XWindow || di.kind == di.Window);
XSelectInput(ddpy, di.window, StructureNotifyMask);
note_geometry(ddpy, di.window, &width, &height);
di.update_geometry(width, height);
GLXContext context = primus.dfns.glXCreateNewContext(ddpy, primus.dconfigs[0], GLX_RGBA_TYPE, NULL, True);
die_if(!primus.dfns.glXIsDirect(ddpy, context),
"failed to acquire direct rendering context for display thread\n");
if (!primus.dispmethod)
primus.dispmethod = test_drawpixels_fast(ddpy, context) ? 2 : 1;
primus.dfns.glXMakeCurrent(ddpy, di.window, context);
bool use_textures = (primus.dispmethod == 1);
if (use_textures)
{
primus.dfns.glVertexPointer (2, GL_FLOAT, 0, quad_vertex_coords);
primus.dfns.glTexCoordPointer(2, GL_FLOAT, 0, quad_texture_coords);
primus.dfns.glEnableClientState(GL_VERTEX_ARRAY);
primus.dfns.glEnableClientState(GL_TEXTURE_COORD_ARRAY);
primus.dfns.glGenTextures(2, textures);
primus.dfns.glEnable(GL_TEXTURE_2D);
}
else
primus.dfns.glGenBuffers(2, pbos);
for (;;)
{
sem_wait(&di.d.acqsem);
profiler.tick(true);
if (di.d.reinit)
{
if (di.d.reinit == di.SHUTDOWN)
{
if (use_textures)
primus.dfns.glDeleteTextures(2, textures);
else
primus.dfns.glDeleteBuffers(2, pbos);
primus.dfns.glXMakeCurrent(ddpy, 0, NULL);
primus.dfns.glXDestroyContext(ddpy, context);
XCloseDisplay(ddpy);
sem_post(&di.d.relsem);
return NULL;
}
di.d.reinit = di.NONE;
profiler.width = width = di.width;
profiler.height = height = di.height;
primus.dfns.glViewport(0, 0, width, height);
if (use_textures)
{
primus.dfns.glBindTexture(GL_TEXTURE_2D, textures[ctex ^ 1]);
primus.dfns.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
primus.dfns.glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
primus.dfns.glBindTexture(GL_TEXTURE_2D, textures[ctex]);
primus.dfns.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
primus.dfns.glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
}
else
{
primus.dfns.glBindBuffer(GL_PIXEL_UNPACK_BUFFER_EXT, pbos[ctex ^ 1]);
primus.dfns.glBufferData(GL_PIXEL_UNPACK_BUFFER_EXT, width*height*4, NULL, GL_STREAM_DRAW);
primus.dfns.glBindBuffer(GL_PIXEL_UNPACK_BUFFER_EXT, pbos[ctex]);
primus.dfns.glBufferData(GL_PIXEL_UNPACK_BUFFER_EXT, width*height*4, NULL, GL_STREAM_DRAW);
}
sem_post(&di.d.relsem);
continue;
}
if (use_textures)
primus.dfns.glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_BGRA, GL_UNSIGNED_BYTE, di.pixeldata);
else
primus.dfns.glBufferSubData(GL_PIXEL_UNPACK_BUFFER_EXT, 0, width*height*4, di.pixeldata);
if (!primus.sync)
sem_post(&di.d.relsem); // Unlock as soon as possible
profiler.tick();
if (use_textures)
{
primus.dfns.glDrawArrays(GL_QUADS, 0, 4);
primus.dfns.glBindTexture(GL_TEXTURE_2D, textures[ctex ^= 1]);
}
else
{
primus.dfns.glDrawPixels(width, height, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
primus.dfns.glBindBuffer(GL_PIXEL_UNPACK_BUFFER_EXT, pbos[ctex ^= 1]);
}
primus.dfns.glXSwapBuffers(ddpy, di.window);
for (int pending = XPending(ddpy); pending > 0; pending--)
{
XEvent event;
XNextEvent(ddpy, &event);
if (event.type == ConfigureNotify)
di.update_geometry(event.xconfigure.width, event.xconfigure.height);
}
if (primus.sync)
sem_post(&di.d.relsem); // Unlock only after drawing
profiler.tick();
}
return NULL;
}
static void* readback_work(void *vd)
{
GLXDrawable drawable = (GLXDrawable)vd;
DrawableInfo &di = primus.drawables[drawable];
int width, height;
GLuint pbos[2] = {0};
int cbuf = 0;
unsigned sleep_usec = 0;
static const char *state_names[] = {"app", "sleep", "map", "wait", NULL};
Profiler profiler("readback", state_names);
struct timespec tp;
if (!primus.sync)
sem_post(&di.d.relsem); // No PBO is mapped initially
GLXContext context = primus.afns.glXCreateNewContext(primus.adpy, di.fbconfig, GLX_RGBA_TYPE, di.actx, True);
die_if(!primus.afns.glXIsDirect(primus.adpy, context),
"failed to acquire direct rendering context for readback thread\n");
primus.afns.glXMakeCurrent(primus.adpy, di.pbuffer, context);
primus.afns.glGenBuffers(2, &pbos[0]);
primus.afns.glReadBuffer(GL_FRONT);
for (;;)
{
sem_wait(&di.r.acqsem);
profiler.tick(true);
if (di.r.reinit)
{
clock_gettime(CLOCK_REALTIME, &tp);
tp.tv_sec += 1;
// Wait for D worker, if active
if (!primus.sync && sem_timedwait(&di.d.relsem, &tp))
{
pthread_cancel(di.d.worker);
sem_post(&di.d.relsem); // Pretend that D worker completed reinit
primus_warn("timeout waiting for display worker\n");
die_if(di.r.reinit != di.SHUTDOWN, "killed worker on resize\n");
}
di.d.reinit = di.r.reinit;
sem_post(&di.d.acqsem); // Signal D worker to reinit
sem_wait(&di.d.relsem); // Wait until reinit was completed
if (!primus.sync)
sem_post(&di.d.relsem); // Unlock as no PBO is currently mapped
if (di.r.reinit == di.SHUTDOWN)
{
primus.afns.glBindBuffer(GL_PIXEL_PACK_BUFFER_EXT, pbos[cbuf ^ 1]);
primus.afns.glUnmapBuffer(GL_PIXEL_PACK_BUFFER_EXT);
primus.afns.glDeleteBuffers(2, &pbos[0]);
primus.afns.glXMakeCurrent(primus.adpy, 0, NULL);
primus.afns.glXDestroyContext(primus.adpy, context);
sem_post(&di.r.relsem);
return NULL;
}
di.r.reinit = di.NONE;
profiler.width = width = di.width;
profiler.height = height = di.height;
primus.afns.glXMakeCurrent(primus.adpy, di.pbuffer, context);
primus.afns.glBindBuffer(GL_PIXEL_PACK_BUFFER_EXT, pbos[cbuf ^ 1]);
primus.afns.glBufferData(GL_PIXEL_PACK_BUFFER_EXT, width*height*4, NULL, GL_STREAM_READ);
primus.afns.glBindBuffer(GL_PIXEL_PACK_BUFFER_EXT, pbos[cbuf]);
primus.afns.glBufferData(GL_PIXEL_PACK_BUFFER_EXT, width*height*4, NULL, GL_STREAM_READ);
}
primus.afns.glWaitSync(di.sync, 0, GL_TIMEOUT_IGNORED);
primus.afns.glReadPixels(0, 0, width, height, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
if (!primus.sync)
sem_post(&di.r.relsem); // Unblock main thread as soon as possible
usleep(sleep_usec);
profiler.tick();
if (primus.sync == 1) // Get the previous framebuffer
primus.afns.glBindBuffer(GL_PIXEL_PACK_BUFFER_EXT, pbos[cbuf ^ 1]);
double map_time = Profiler::get_timestamp();
GLvoid *pixeldata = primus.afns.glMapBuffer(GL_PIXEL_PACK_BUFFER_EXT, GL_READ_ONLY);
map_time = Profiler::get_timestamp() - map_time;
sleep_usec = (map_time * 1e6 + sleep_usec) * primus.autosleep / 100;
profiler.tick();
clock_gettime(CLOCK_REALTIME, &tp);
tp.tv_sec += 1;
if (!primus.sync && sem_timedwait(&di.d.relsem, &tp))
primus_warn("dropping a frame to avoid deadlock\n");
else
{
di.pixeldata = pixeldata;
sem_post(&di.d.acqsem);
if (primus.sync)
{
sem_wait(&di.d.relsem);
sem_post(&di.r.relsem); // Unblock main thread only after D::work has completed
}
cbuf ^= 1;
primus.afns.glBindBuffer(GL_PIXEL_PACK_BUFFER_EXT, pbos[cbuf]);
}
primus.afns.glUnmapBuffer(GL_PIXEL_PACK_BUFFER_EXT);
profiler.tick();
}
return NULL;
}
// Find appropriate FBConfigs on adpy for a given Visual on ddpy
static GLXFBConfig* match_fbconfig(XVisualInfo *vis)
{
int ncfg, attrs[] = {
GLX_DOUBLEBUFFER, 0, GLX_STEREO, 0, GLX_AUX_BUFFERS, 0,
GLX_RED_SIZE, 0, GLX_GREEN_SIZE, 0, GLX_BLUE_SIZE, 0,
GLX_ALPHA_SIZE, 0, GLX_DEPTH_SIZE, 0, GLX_STENCIL_SIZE, 0,
GLX_ACCUM_RED_SIZE, 0, GLX_ACCUM_GREEN_SIZE, 0, GLX_ACCUM_BLUE_SIZE, 0, GLX_ACCUM_ALPHA_SIZE, 0,
GLX_SAMPLE_BUFFERS, 0, GLX_SAMPLES, 0, None
};
for (int i = 0; attrs[i] != None; i += 2)
primus.dfns.glXGetConfig(primus.ddpy, vis, attrs[i], &attrs[i+1]);
return primus.afns.glXChooseFBConfig(primus.adpy, 0, attrs, &ncfg);
}
GLXContext glXCreateContext(Display *dpy, XVisualInfo *vis, GLXContext shareList, Bool direct)
{
GLXFBConfig *acfgs = match_fbconfig(vis);
GLXContext actx = primus.afns.glXCreateNewContext(primus.adpy, *acfgs, GLX_RGBA_TYPE, shareList, direct);
primus.contexts.record(actx, *acfgs, shareList);
return actx;
}
GLXContext glXCreateNewContext(Display *dpy, GLXFBConfig config, int renderType, GLXContext shareList, Bool direct)
{
GLXContext actx = primus.afns.glXCreateNewContext(primus.adpy, config, renderType, shareList, direct);
primus.contexts.record(actx, config, shareList);
return actx;
}
GLXContext glXCreateContextAttribsARB(Display *dpy, GLXFBConfig config, GLXContext shareList, Bool direct, const int *attrib_list)
{
GLXContext actx = primus.afns.glXCreateContextAttribsARB(primus.adpy, config, shareList, direct, attrib_list);
primus.contexts.record(actx, config, shareList);
return actx;
}
void glXDestroyContext(Display *dpy, GLXContext ctx)
{
primus.contexts.erase(ctx);
// kludge: reap background tasks when deleting the last context
// otherwise something will deadlock during unloading the library
if (primus.contexts.empty())
for (DrawablesInfo::iterator i = primus.drawables.begin(); i != primus.drawables.end(); i++)
i->second.reap_workers();
primus.afns.glXDestroyContext(primus.adpy, ctx);
}
static GLXPbuffer create_pbuffer(DrawableInfo &di)
{
int pbattrs[] = {GLX_PBUFFER_WIDTH, di.width, GLX_PBUFFER_HEIGHT, di.height, GLX_PRESERVED_CONTENTS, True, None};
return primus.afns.glXCreatePbuffer(primus.adpy, di.fbconfig, pbattrs);
}
// Create or recall backing Pbuffer for the drawable
static GLXPbuffer lookup_pbuffer(Display *dpy, GLXDrawable draw, GLXContext ctx)
{
if (!draw)
return 0;
bool known = primus.drawables.known(draw);
DrawableInfo &di = primus.drawables[draw];
if (!known)
{
// Drawable is a plain X Window. Get the FBConfig from the context
if (ctx)
di.fbconfig = primus.contexts[ctx].fbconfig;
else
{
XWindowAttributes attrs;
die_if(!XGetWindowAttributes(dpy, draw, &attrs), "failed to query attributes");
int nvis;
XVisualInfo tmpl = {0}, *vis;
tmpl.visualid = XVisualIDFromVisual(attrs.visual);
die_if(!(vis = XGetVisualInfo(dpy, VisualIDMask, &tmpl, &nvis)), "no visuals");
di.fbconfig = *match_fbconfig(vis);
XFree(vis);
}
di.kind = di.XWindow;
di.window = draw;
note_geometry(dpy, draw, &di.width, &di.height);
}
else if (ctx && di.fbconfig != primus.contexts[ctx].fbconfig)
{
if (di.pbuffer)
{
primus_warn("recreating incompatible pbuffer\n");
di.reap_workers();
primus.afns.glXDestroyPbuffer(primus.adpy, di.pbuffer);
di.pbuffer = 0;
}
di.fbconfig = primus.contexts[ctx].fbconfig;
}
if (!di.pbuffer)
di.pbuffer = create_pbuffer(di);
return di.pbuffer;
}
Bool glXMakeCurrent(Display *dpy, GLXDrawable drawable, GLXContext ctx)
{
GLXPbuffer pbuffer = lookup_pbuffer(dpy, drawable, ctx);
tsdata.make_current(dpy, drawable, drawable);
return primus.afns.glXMakeCurrent(primus.adpy, pbuffer, ctx);
}
Bool glXMakeContextCurrent(Display *dpy, GLXDrawable draw, GLXDrawable read, GLXContext ctx)
{
if (draw == read)
return glXMakeCurrent(dpy, draw, ctx);
GLXPbuffer pbuffer = lookup_pbuffer(dpy, draw, ctx);
GLXPbuffer pb_read = lookup_pbuffer(dpy, read, ctx);
tsdata.make_current(dpy, draw, read);
return primus.afns.glXMakeContextCurrent(primus.adpy, pbuffer, pb_read, ctx);
}
void glXSwapBuffers(Display *dpy, GLXDrawable drawable)
{
XFlush(dpy);
assert(primus.drawables.known(drawable));
DrawableInfo &di = primus.drawables[drawable];
primus.afns.glXSwapBuffers(primus.adpy, di.pbuffer);
if (di.kind == di.Pbuffer || di.kind == di.Pixmap)
return;
GLXContext ctx = glXGetCurrentContext();
if (!ctx)
primus_warn("glXSwapBuffers: no current context\n");
else if (drawable != tsdata.drawable)
primus_warn("glXSwapBuffers: drawable not current\n");
if (di.r.worker && ctx && (!di.actx || primus.contexts[di.actx].sharegroup != primus.contexts[ctx].sharegroup))
{
primus_warn("glXSwapBuffers: respawning threads after context change\n");
di.reap_workers();
}
if (!di.r.worker)
{
// Need to create a sharing context to use GL sync objects
di.actx = ctx;
di.d.spawn_worker(drawable, display_work);
di.r.spawn_worker(drawable, readback_work);
}
// Readback thread needs a sync object to avoid reading an incomplete frame
di.sync = primus.afns.glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
sem_post(&di.r.acqsem); // Signal the readback worker thread
sem_wait(&di.r.relsem); // Wait until it has issued glReadBuffer
primus.afns.glDeleteSync(di.sync);
if (di.reinit == di.RESIZE)
{
__sync_synchronize();
primus.afns.glXDestroyPbuffer(primus.adpy, di.pbuffer);
di.pbuffer = create_pbuffer(di);
if (ctx) // FIXME: drawable can be current in other threads
glXMakeContextCurrent(dpy, tsdata.drawable, tsdata.read_drawable, ctx);
di.r.reinit = di.reinit;
di.reinit = di.NONE;
}
}
GLXWindow glXCreateWindow(Display *dpy, GLXFBConfig config, Window win, const int *attribList)
{
GLXWindow glxwin = primus.dfns.glXCreateWindow(dpy, primus.dconfigs[0], win, attribList);
DrawableInfo &di = primus.drawables[glxwin];
di.kind = di.Window;
di.fbconfig = config;
di.window = win;
note_geometry(dpy, win, &di.width, &di.height);
return glxwin;
}
DrawableInfo::~DrawableInfo()
{
reap_workers();
if (pbuffer)
primus.afns.glXDestroyPbuffer(primus.adpy, pbuffer);
}
void glXDestroyWindow(Display *dpy, GLXWindow window)
{
assert(primus.drawables.known(window));
primus.drawables.erase(window);
primus.dfns.glXDestroyWindow(dpy, window);
}
GLXPbuffer glXCreatePbuffer(Display *dpy, GLXFBConfig config, const int *attribList)
{
GLXPbuffer pbuffer = primus.dfns.glXCreatePbuffer(dpy, primus.dconfigs[0], attribList);
DrawableInfo &di = primus.drawables[pbuffer];
di.kind = di.Pbuffer;
di.fbconfig = config;
for (int i = 0; attribList[i] != None; i++)
if (attribList[i] == GLX_PBUFFER_WIDTH)
di.width = attribList[i+1];
else if (attribList[i] == GLX_PBUFFER_HEIGHT)
di.height = attribList[i+1];
return pbuffer;
}
void glXDestroyPbuffer(Display *dpy, GLXPbuffer pbuf)
{
assert(primus.drawables.known(pbuf));
primus.drawables.erase(pbuf);
primus.dfns.glXDestroyPbuffer(dpy, pbuf);
}
GLXPixmap glXCreatePixmap(Display *dpy, GLXFBConfig config, Pixmap pixmap, const int *attribList)
{
GLXPixmap glxpix = primus.dfns.glXCreatePixmap(dpy, primus.dconfigs[0], pixmap, attribList);
DrawableInfo &di = primus.drawables[glxpix];
di.kind = di.Pixmap;
di.fbconfig = config;
note_geometry(dpy, pixmap, &di.width, &di.height);
return glxpix;
}
void glXDestroyPixmap(Display *dpy, GLXPixmap pixmap)
{
assert(primus.drawables.known(pixmap));
primus.drawables.erase(pixmap);
primus.dfns.glXDestroyPixmap(dpy, pixmap);
}
GLXPixmap glXCreateGLXPixmap(Display *dpy, XVisualInfo *visual, Pixmap pixmap)
{
GLXPixmap glxpix = primus.dfns.glXCreateGLXPixmap(dpy, visual, pixmap);
DrawableInfo &di = primus.drawables[glxpix];
di.kind = di.Pixmap;
note_geometry(dpy, pixmap, &di.width, &di.height);
GLXFBConfig *acfgs = match_fbconfig(visual);
di.fbconfig = *acfgs;
return glxpix;
}
void glXDestroyGLXPixmap(Display *dpy, GLXPixmap pixmap)
{
glXDestroyPixmap(dpy, pixmap);
}
static XVisualInfo *match_visual(int attrs[])
{
XVisualInfo *vis = glXChooseVisual(primus.ddpy, 0, attrs);
for (int i = 2; attrs[i] != None && vis; i += 2)
{
int tmp = attrs[i+1];
primus.dfns.glXGetConfig(primus.ddpy, vis, attrs[i], &attrs[i+1]);
if (tmp != attrs[i+1])
vis = NULL;
}
return vis;
}
XVisualInfo *glXGetVisualFromFBConfig(Display *dpy, GLXFBConfig config)
{
if (!primus.afns.glXGetVisualFromFBConfig(primus.adpy, config))
return NULL;
int i, attrs[] = {
GLX_RGBA, GLX_DOUBLEBUFFER,
GLX_RED_SIZE, 0, GLX_GREEN_SIZE, 0, GLX_BLUE_SIZE, 0,
GLX_ALPHA_SIZE, 0, GLX_DEPTH_SIZE, 0, GLX_STENCIL_SIZE, 0,
GLX_SAMPLE_BUFFERS, 0, GLX_SAMPLES, 0, None
};
for (i = 2; attrs[i] != None; i += 2)
primus.afns.glXGetFBConfigAttrib(primus.adpy, config, attrs[i], &attrs[i+1]);
XVisualInfo *vis = NULL;
for (i -= 2; i >= 0 && !vis; i -= 2)
{
vis = match_visual(attrs);
attrs[i] = None;
}
return vis;
}
int glXGetFBConfigAttrib(Display *dpy, GLXFBConfig config, int attribute, int *value)
{
int r = primus.afns.glXGetFBConfigAttrib(primus.adpy, config, attribute, value);
if (attribute == GLX_VISUAL_ID && *value)
return primus.dfns.glXGetConfig(primus.ddpy, glXGetVisualFromFBConfig(dpy, config), attribute, value);
return r;
}
void glXQueryDrawable(Display *dpy, GLXDrawable draw, int attribute, unsigned int *value)
{
primus.afns.glXQueryDrawable(primus.adpy, lookup_pbuffer(dpy, draw, NULL), attribute, value);
}
void glXUseXFont(Font font, int first, int count, int list)
{
unsigned long prop;
XFontStruct *fs = XQueryFont(primus.ddpy, font);
XGetFontProperty(fs, XA_FONT, &prop);
char *xlfd = XGetAtomName(primus.ddpy, prop);
Font afont = XLoadFont(primus.adpy, xlfd);
primus.afns.glXUseXFont(afont, first, count, list);
XUnloadFont(primus.adpy, afont);
XFree(xlfd);
XFreeFontInfo(NULL, fs, 1);
}
GLXContext glXGetCurrentContext(void)
{
return primus.afns.glXGetCurrentContext();
}
GLXDrawable glXGetCurrentDrawable(void)
{
return tsdata.drawable;
}
void glXWaitGL(void)
{
}
void glXWaitX(void)
{
}
Display *glXGetCurrentDisplay(void)
{
return tsdata.dpy;
}
GLXDrawable glXGetCurrentReadDrawable(void)
{
return tsdata.read_drawable;
}
// Application sees ddpy-side Visuals, but adpy-side FBConfigs and Contexts
XVisualInfo* glXChooseVisual(Display *dpy, int screen, int *attribList)
{
return primus.dfns.glXChooseVisual(dpy, screen, attribList);
}
int glXGetConfig(Display *dpy, XVisualInfo *visual, int attrib, int *value)
{
return primus.dfns.glXGetConfig(dpy, visual, attrib, value);
}
// GLX forwarders that reroute to adpy
#define DEF_GLX_PROTO(ret, name, par, ...) \
ret name par \
{ return primus.afns.name(primus.adpy, __VA_ARGS__); }
#include "glx-dpyredir.def"
#undef DEF_GLX_PROTO
// OpenGL forwarders
#define DEF_GLX_PROTO(ret, name, par, ...) \
static ret l##name par \
{ return primus.afns.name(__VA_ARGS__); } \
asm(".type " #name ", %gnu_indirect_function"); \
void *ifunc_##name(void) asm(#name) __attribute__((visibility("default"))); \
void *ifunc_##name(void) \
{ return primus.afns.handle ? real_dlsym(primus.afns.handle, #name) : (void*)l##name; }
#include "gl-passthru.def"
#undef DEF_GLX_PROTO
// GLX extensions
int glXSwapIntervalSGI(int interval)
{
return 1; // Indicate failure to set swapinterval
}
__GLXextFuncPtr glXGetProcAddress(const GLubyte *procName)
{
static const char * const redefined_names[] = {
#define DEF_GLX_PROTO(ret, name, args, ...) #name,
#include "glx-reimpl.def"
#include "glxext-reimpl.def"
#include "glx-dpyredir.def"
#undef DEF_GLX_PROTO
};
static const __GLXextFuncPtr redefined_fns[] = {
#define DEF_GLX_PROTO(ret, name, args, ...) (__GLXextFuncPtr)name,
#include "glx-reimpl.def"
#include "glxext-reimpl.def"
#include "glx-dpyredir.def"
#undef DEF_GLX_PROTO
};
enum {n_redefined = sizeof(redefined_fns) / sizeof(redefined_fns[0])};
// Non-GLX functions are forwarded to the accelerating libGL
if (memcmp(procName, "glX", 3))
return primus.afns.glXGetProcAddress(procName);
// All GLX functions are either implemented in primus or not available
for (int i = 0; i < n_redefined; i++)
if (!strcmp((const char *)procName, redefined_names[i]))
return redefined_fns[i];
return NULL;
}
__GLXextFuncPtr glXGetProcAddressARB(const GLubyte *procName)
{
return glXGetProcAddress(procName);
}
static const char glxext_clientside[] = "GLX_ARB_get_proc_address ";
static const char glxext_adpy[] = "GLX_ARB_create_context GLX_ARB_create_context_profile ";
static const char glxext_ddpy[] = "";
const char *glXGetClientString(Display *dpy, int name)
{
static std::string exts(std::string(glxext_clientside) + glxext_adpy + glxext_ddpy);
switch (name)
{
case GLX_VENDOR: return "primus";
case GLX_VERSION: return "1.4";
case GLX_EXTENSIONS: return exts.c_str();
default: return NULL;
}
}
static std::string intersect_exts(const char *set1, const char *set2)
{
std::string r;
for (const char *p; *set1; set1 = p + 1)
{
p = strchr(set1, ' ');
if (memmem(set2, strlen(set2), set1, p - set1))
r.append(set1, p - set1 + 1);
}
return r;
}
const char *glXQueryExtensionsString(Display *dpy, int screen)
{
static std::string exts
(std::string(glxext_clientside)
+ intersect_exts(glxext_adpy, primus.afns.glXQueryExtensionsString(primus.adpy, 0))
+ intersect_exts(glxext_ddpy, primus.dfns.glXQueryExtensionsString(primus.ddpy, 0)));
return exts.c_str();
}