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/*************************************************************************/
/* detect_prime.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifdef X11_ENABLED
#if defined(OPENGL_ENABLED)
#include "detect_prime.h"
#include "core/print_string.h"
#include "core/ustring.h"
#include <stdlib.h>
#include <GL/gl.h>
#include <GL/glx.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <cstring>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#define GLX_CONTEXT_MAJOR_VERSION_ARB 0x2091
#define GLX_CONTEXT_MINOR_VERSION_ARB 0x2092
typedef GLXContext (*GLXCREATECONTEXTATTRIBSARBPROC)(Display *, GLXFBConfig, GLXContext, Bool, const int *);
struct vendor {
const char *glxvendor;
int priority;
};
vendor vendormap[] = {
{ "Advanced Micro Devices, Inc.", 30 },
{ "NVIDIA Corporation", 30 },
{ "X.Org", 30 },
{ "Intel Open Source Technology Center", 20 },
{ "Intel", 20 },
{ "nouveau", 10 },
{ "Mesa Project", 0 },
{ NULL, 0 }
};
// Runs inside a child. Exiting will not quit the engine.
void create_context() {
Display *x11_display = XOpenDisplay(NULL);
Window x11_window;
GLXContext glx_context;
GLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB = (GLXCREATECONTEXTATTRIBSARBPROC)glXGetProcAddress((const GLubyte *)"glXCreateContextAttribsARB");
static int visual_attribs[] = {
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_DOUBLEBUFFER, true,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DEPTH_SIZE, 24,
None
};
int fbcount;
GLXFBConfig fbconfig = 0;
XVisualInfo *vi = NULL;
XSetWindowAttributes swa;
swa.event_mask = StructureNotifyMask;
swa.border_pixel = 0;
unsigned long valuemask = CWBorderPixel | CWColormap | CWEventMask;
GLXFBConfig *fbc = glXChooseFBConfig(x11_display, DefaultScreen(x11_display), visual_attribs, &fbcount);
if (!fbc)
exit(1);
vi = glXGetVisualFromFBConfig(x11_display, fbc[0]);
fbconfig = fbc[0];
static int context_attribs[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
GLX_CONTEXT_MINOR_VERSION_ARB, 3,
GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
None
};
glx_context = glXCreateContextAttribsARB(x11_display, fbconfig, NULL, true, context_attribs);
swa.colormap = XCreateColormap(x11_display, RootWindow(x11_display, vi->screen), vi->visual, AllocNone);
x11_window = XCreateWindow(x11_display, RootWindow(x11_display, vi->screen), 0, 0, 10, 10, 0, vi->depth, InputOutput, vi->visual, valuemask, &swa);
if (!x11_window)
exit(1);
glXMakeCurrent(x11_display, x11_window, glx_context);
XFree(vi);
}
int detect_prime() {
pid_t p;
int priorities[2];
String vendors[2];
String renderers[2];
vendors[0] = "Unknown";
vendors[1] = "Unknown";
renderers[0] = "Unknown";
renderers[1] = "Unknown";
for (int i = 0; i < 2; ++i) {
int fdset[2];
if (pipe(fdset) == -1) {
print_verbose("Failed to pipe(), using default GPU");
return 0;
}
// Fork so the driver initialization can crash without taking down the engine.
p = fork();
if (p > 0) {
// Main thread
int stat_loc = 0;
char string[201];
string[200] = '\0';
close(fdset[1]);
waitpid(p, &stat_loc, 0);
if (!stat_loc) {
// No need to do anything complicated here. Anything less than
// PIPE_BUF will be delivered in one read() call.
// Leave it 'Unknown' otherwise.
if (read(fdset[0], string, sizeof(string) - 1) > 0) {
vendors[i] = string;
renderers[i] = string + strlen(string) + 1;
}
}
close(fdset[0]);
} else {
// In child, exit() here will not quit the engine.
char string[201];
close(fdset[0]);
if (i) setenv("DRI_PRIME", "1", 1);
create_context();
const char *vendor = (const char *)glGetString(GL_VENDOR);
const char *renderer = (const char *)glGetString(GL_RENDERER);
unsigned int vendor_len = strlen(vendor) + 1;
unsigned int renderer_len = strlen(renderer) + 1;
if (vendor_len + renderer_len >= sizeof(string)) {
renderer_len = 200 - vendor_len;
}
memcpy(&string, vendor, vendor_len);
memcpy(&string[vendor_len], renderer, renderer_len);
if (write(fdset[1], string, vendor_len + renderer_len) == -1) {
print_verbose("Couldn't write vendor/renderer string.");
}
close(fdset[1]);
exit(0);
}
}
int preferred = 0;
int priority = 0;
if (vendors[0] == vendors[1]) {
print_verbose("Only one GPU found, using default.");
return 0;
}
for (int i = 1; i >= 0; --i) {
vendor *v = vendormap;
while (v->glxvendor) {
if (v->glxvendor == vendors[i]) {
priorities[i] = v->priority;
if (v->priority >= priority) {
priority = v->priority;
preferred = i;
}
}
++v;
}
}
print_verbose("Found renderers:");
for (int i = 0; i < 2; ++i) {
print_verbose("Renderer " + itos(i) + ": " + renderers[i] + " with priority: " + itos(priorities[i]));
}
print_verbose("Using renderer: " + renderers[preferred]);
return preferred;
}
#endif
#endif
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