mirror of
https://gitlab.com/sortix/sortix.git
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146 lines
4.1 KiB
C++
146 lines
4.1 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012.
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This file is part of dispd.
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dispd is free software: you can redistribute it and/or modify it under the
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terms of the GNU Lesser General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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dispd is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details.
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You should have received a copy of the GNU Lesser General Public License
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along with dispd. If not, see <http://www.gnu.org/licenses/>.
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session.cpp
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Handles session management.
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*******************************************************************************/
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#include <sys/types.h>
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#include <sys/display.h>
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#include <sys/wait.h>
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#include <error.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <dispd.h>
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#include "session.h"
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const uint64_t ONE_AND_ONLY_DEVICE = 0;
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const uint64_t ONE_AND_ONLY_CONNECTOR = 0;
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struct dispd_session* global_session = NULL;
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bool dispd__session_initialize(int* /*argc*/, char*** /*argv*/)
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{
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size_t size = sizeof(struct dispd_session);
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global_session = (struct dispd_session*) malloc(size);
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if ( !global_session )
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return false;
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memset(global_session, 0, sizeof(*global_session));
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global_session->device = ONE_AND_ONLY_DEVICE;
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global_session->connector = ONE_AND_ONLY_CONNECTOR;
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return true;
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}
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struct dispd_session* dispd_attach_default_session()
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{
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global_session->refcount++;
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return global_session;
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}
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bool dispd_detach_session(struct dispd_session* session)
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{
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session->refcount--;
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return true;
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}
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bool dispd_session_setup_game_vga(struct dispd_session* session)
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{
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if ( session->is_vga )
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return true;
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if ( session->is_rgba )
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return false;
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if ( session->current_window )
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return false;
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struct dispmsg_get_crtc_mode msg;
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msg.msgid = DISPMSG_GET_CRTC_MODE;
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msg.device = session->device;
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msg.connector = session->connector;
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if ( dispmsg_issue(&msg, sizeof(msg)) != 0 )
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return false;
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if ( (session->is_vga = !(msg.mode.control & 1)) )
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return true;
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error(0, 0, "This program requires a VGA Text Mode buffer, but you are "
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"currently using an incompatible (perhaps graphics) mode.");
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return false;
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}
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bool dispd_session_setup_game_rgba(struct dispd_session* session)
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{
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if ( session->is_vga )
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return false;
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if ( session->is_rgba )
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return true;
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if ( session->current_window )
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return false;
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struct dispmsg_get_crtc_mode msg;
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msg.msgid = DISPMSG_GET_CRTC_MODE;
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msg.device = session->device;
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msg.connector = session->connector;
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if ( dispmsg_issue(&msg, sizeof(msg)) != 0 )
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return false;
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if ( !(msg.mode.control & 1) || msg.mode.fb_format != 32 )
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{
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pid_t childpid = fork();
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if ( childpid < 0 )
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return false;
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if ( childpid )
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{
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int status;
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waitpid(childpid, &status, 0);
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return session->is_rgba = (WIFEXITED(status) && !WEXITSTATUS(status));
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}
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const char* chvideomode = "chvideomode";
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#if 1
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// TODO chvideomode currently launches --bpp 32 as a program...
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execlp(chvideomode, chvideomode, NULL);
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#else
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execlp(chvideomode, chvideomode,
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"--bpp", "32",
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"--show-graphics", "true",
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"--show-text", "false",
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NULL);
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#endif
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perror(chvideomode);
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exit(127);
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}
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// HACK: The console may be rendered asynchronously and it might still be
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// rendering to the framebuffer, however this process is about to do
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// bitmapped graphics to the framebuffer as well. Since there is no
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// synchronization with the terminal except not writing to it, there
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// is a small window where both are fighting for the framebuffer.
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// We can resolve this issue by simply fsync()ing the terminal, which
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// causes the scheduled console rendering to finish before returning.
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int tty_fd = open("/dev/tty", O_WRONLY);
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if ( 0 <= tty_fd )
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{
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fsync(tty_fd);
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close(tty_fd);
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}
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return session->is_rgba = true;
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}
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