| 1 |
/* |
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* video_vosf.h - Video/graphics emulation, video on SEGV signals support |
| 3 |
* |
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* Basilisk II (C) 1997-2004 Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#ifndef VIDEO_VOSF_H |
| 22 |
#define VIDEO_VOSF_H |
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|
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// Note: this file must be #include'd only in video_x.cpp |
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#ifdef ENABLE_VOSF |
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|
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#include <fcntl.h> |
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#include <sys/mman.h> |
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#include "sigsegv.h" |
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#include "vm_alloc.h" |
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|
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// Glue for SDL and X11 support |
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#ifdef USE_SDL_VIDEO |
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#define MONITOR_INIT SDL_monitor_desc &monitor |
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#define VIDEO_DRV_INIT driver_window *drv |
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#define VIDEO_DRV_ROW_BYTES drv->s->pitch |
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#define VIDEO_DRV_LOCK_PIXELS if (SDL_MUSTLOCK(drv->s)) SDL_LockSurface(drv->s) |
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#define VIDEO_DRV_UNLOCK_PIXELS if (SDL_MUSTLOCK(drv->s)) SDL_UnlockSurface(drv->s) |
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#else |
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#ifdef SHEEPSHAVER |
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#define MONITOR_INIT /* nothing */ |
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#define VIDEO_DRV_INIT /* nothing */ |
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#define VIDEO_DRV_WINDOW the_win |
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#define VIDEO_DRV_GC the_gc |
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#define VIDEO_DRV_IMAGE img |
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#define VIDEO_DRV_HAVE_SHM have_shm |
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#else |
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#define MONITOR_INIT X11_monitor_desc &monitor |
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#define VIDEO_DRV_INIT driver_window *drv |
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#define VIDEO_DRV_WINDOW drv->w |
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#define VIDEO_DRV_GC drv->gc |
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#define VIDEO_DRV_IMAGE drv->img |
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#define VIDEO_DRV_HAVE_SHM drv->have_shm |
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#endif |
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#define VIDEO_DRV_LOCK_PIXELS /* nothing */ |
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#define VIDEO_DRV_UNLOCK_PIXELS /* nothing */ |
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#define VIDEO_DRV_ROW_BYTES VIDEO_DRV_IMAGE->bytes_per_line |
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#endif |
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|
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// Variables for Video on SEGV support |
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static uint8 *the_host_buffer; // Host frame buffer in VOSF mode |
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|
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struct ScreenPageInfo { |
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int top, bottom; // Mapping between this virtual page and Mac scanlines |
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}; |
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|
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struct ScreenInfo { |
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uintptr memStart; // Start address aligned to page boundary |
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uint32 memLength; // Length of the memory addressed by the screen pages |
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|
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uintptr pageSize; // Size of a page |
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int pageBits; // Shift count to get the page number |
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uint32 pageCount; // Number of pages allocated to the screen |
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|
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bool dirty; // Flag: set if the frame buffer was touched |
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char * dirtyPages; // Table of flags set if page was altered |
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ScreenPageInfo * pageInfo; // Table of mappings page -> Mac scanlines |
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}; |
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|
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static ScreenInfo mainBuffer; |
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|
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#define PFLAG_SET_VALUE 0x00 |
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#define PFLAG_CLEAR_VALUE 0x01 |
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#define PFLAG_SET_VALUE_4 0x00000000 |
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#define PFLAG_CLEAR_VALUE_4 0x01010101 |
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#define PFLAG_SET(page) mainBuffer.dirtyPages[page] = PFLAG_SET_VALUE |
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#define PFLAG_CLEAR(page) mainBuffer.dirtyPages[page] = PFLAG_CLEAR_VALUE |
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#define PFLAG_ISSET(page) (mainBuffer.dirtyPages[page] == PFLAG_SET_VALUE) |
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#define PFLAG_ISCLEAR(page) (mainBuffer.dirtyPages[page] != PFLAG_SET_VALUE) |
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|
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#ifdef UNALIGNED_PROFITABLE |
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# define PFLAG_ISSET_4(page) (*((uint32 *)(mainBuffer.dirtyPages + (page))) == PFLAG_SET_VALUE_4) |
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# define PFLAG_ISCLEAR_4(page) (*((uint32 *)(mainBuffer.dirtyPages + (page))) == PFLAG_CLEAR_VALUE_4) |
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#else |
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# define PFLAG_ISSET_4(page) \ |
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PFLAG_ISSET(page ) && PFLAG_ISSET(page+1) \ |
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&& PFLAG_ISSET(page+2) && PFLAG_ISSET(page+3) |
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# define PFLAG_ISCLEAR_4(page) \ |
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PFLAG_ISCLEAR(page ) && PFLAG_ISCLEAR(page+1) \ |
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&& PFLAG_ISCLEAR(page+2) && PFLAG_ISCLEAR(page+3) |
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#endif |
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|
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// Set the selected page range [ first_page, last_page [ into the SET state |
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#define PFLAG_SET_RANGE(first_page, last_page) \ |
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memset(mainBuffer.dirtyPages + (first_page), PFLAG_SET_VALUE, \ |
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(last_page) - (first_page)) |
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|
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// Set the selected page range [ first_page, last_page [ into the CLEAR state |
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#define PFLAG_CLEAR_RANGE(first_page, last_page) \ |
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memset(mainBuffer.dirtyPages + (first_page), PFLAG_CLEAR_VALUE, \ |
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(last_page) - (first_page)) |
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|
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#define PFLAG_SET_ALL do { \ |
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PFLAG_SET_RANGE(0, mainBuffer.pageCount); \ |
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mainBuffer.dirty = true; \ |
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} while (0) |
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|
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#define PFLAG_CLEAR_ALL do { \ |
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PFLAG_CLEAR_RANGE(0, mainBuffer.pageCount); \ |
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mainBuffer.dirty = false; \ |
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} while (0) |
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|
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// Set the following macro definition to 1 if your system |
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// provides a really fast strchr() implementation |
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//#define HAVE_FAST_STRCHR 0 |
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|
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static inline int find_next_page_set(int page) |
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{ |
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#if HAVE_FAST_STRCHR |
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char *match = strchr(mainBuffer.dirtyPages + page, PFLAG_SET_VALUE); |
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return match ? match - mainBuffer.dirtyPages : mainBuffer.pageCount; |
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#else |
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while (PFLAG_ISCLEAR_4(page)) |
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page += 4; |
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while (PFLAG_ISCLEAR(page)) |
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page++; |
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return page; |
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#endif |
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} |
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|
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static inline int find_next_page_clear(int page) |
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{ |
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#if HAVE_FAST_STRCHR |
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char *match = strchr(mainBuffer.dirtyPages + page, PFLAG_CLEAR_VALUE); |
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return match ? match - mainBuffer.dirtyPages : mainBuffer.pageCount; |
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#else |
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while (PFLAG_ISSET_4(page)) |
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page += 4; |
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while (PFLAG_ISSET(page)) |
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page++; |
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return page; |
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#endif |
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} |
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|
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#ifdef HAVE_SPINLOCKS |
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static spinlock_t vosf_lock = SPIN_LOCK_UNLOCKED; // Mutex to protect frame buffer (dirtyPages in fact) |
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#define LOCK_VOSF spin_lock(&vosf_lock) |
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#define UNLOCK_VOSF spin_unlock(&vosf_lock) |
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#elif defined(HAVE_PTHREADS) |
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static pthread_mutex_t vosf_lock = PTHREAD_MUTEX_INITIALIZER; // Mutex to protect frame buffer (dirtyPages in fact) |
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#define LOCK_VOSF pthread_mutex_lock(&vosf_lock); |
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#define UNLOCK_VOSF pthread_mutex_unlock(&vosf_lock); |
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#else |
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#define LOCK_VOSF |
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#define UNLOCK_VOSF |
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#endif |
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|
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static int log_base_2(uint32 x) |
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{ |
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uint32 mask = 0x80000000; |
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int l = 31; |
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while (l >= 0 && (x & mask) == 0) { |
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mask >>= 1; |
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l--; |
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} |
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return l; |
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} |
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|
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// Extend size to page boundary |
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static uint32 page_extend(uint32 size) |
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{ |
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const uint32 page_size = getpagesize(); |
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const uint32 page_mask = page_size - 1; |
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return (size + page_mask) & ~page_mask; |
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} |
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|
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|
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/* |
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* Check if VOSF acceleration is profitable on this platform |
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*/ |
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|
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const int VOSF_PROFITABLE_TRIES = 3; // Make 3 attempts for full screen update |
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const int VOSF_PROFITABLE_THRESHOLD = 16667; // 60 Hz |
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|
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static bool video_vosf_profitable(void) |
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{ |
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int64 durations[VOSF_PROFITABLE_TRIES]; |
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int mean_duration = 0; |
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|
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for (int i = 0; i < VOSF_PROFITABLE_TRIES; i++) { |
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uint64 start = GetTicks_usec(); |
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for (int p = 0; p < mainBuffer.pageCount; p++) { |
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uint8 *addr = (uint8 *)(mainBuffer.memStart + (p * mainBuffer.pageSize)); |
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addr[0] = 0; // Trigger Screen_fault_handler() |
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} |
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int64 duration = GetTicks_usec() - start; |
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mean_duration += duration; |
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durations[i] = duration; |
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|
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PFLAG_CLEAR_ALL; |
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mainBuffer.dirty = false; |
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if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0) |
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return false; |
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} |
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|
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mean_duration /= VOSF_PROFITABLE_TRIES; |
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D(bug("Triggered %d screen faults in %ld usec on average\n", mainBuffer.pageCount, mean_duration)); |
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return (mean_duration < (VOSF_PROFITABLE_THRESHOLD * (frame_skip ? frame_skip : 1))); |
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} |
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|
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|
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/* |
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* Initialize the VOSF system (mainBuffer structure, SIGSEGV handler) |
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*/ |
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|
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static bool video_vosf_init(MONITOR_INIT) |
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{ |
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VIDEO_MODE_INIT_MONITOR; |
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|
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const uintptr page_size = getpagesize(); |
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const uintptr page_mask = page_size - 1; |
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|
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// Round up frame buffer base to page boundary |
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mainBuffer.memStart = (((uintptr) the_buffer) + page_mask) & ~page_mask; |
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|
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// The frame buffer size shall already be aligned to page boundary (use page_extend) |
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mainBuffer.memLength = the_buffer_size; |
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|
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mainBuffer.pageSize = page_size; |
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mainBuffer.pageBits = log_base_2(mainBuffer.pageSize); |
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mainBuffer.pageCount = (mainBuffer.memLength + page_mask)/mainBuffer.pageSize; |
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|
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// The "2" more bytes requested are a safety net to insure the |
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// loops in the update routines will terminate. |
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// See "How can we deal with array overrun conditions ?" hereunder for further details. |
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mainBuffer.dirtyPages = (char *) malloc(mainBuffer.pageCount + 2); |
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if (mainBuffer.dirtyPages == NULL) |
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return false; |
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|
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PFLAG_CLEAR_ALL; |
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PFLAG_CLEAR(mainBuffer.pageCount); |
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PFLAG_SET(mainBuffer.pageCount+1); |
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|
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// Allocate and fill in pageInfo with start and end (inclusive) row in number of bytes |
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mainBuffer.pageInfo = (ScreenPageInfo *) malloc(mainBuffer.pageCount * sizeof(ScreenPageInfo)); |
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if (mainBuffer.pageInfo == NULL) |
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return false; |
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|
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uint32 a = 0; |
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for (unsigned i = 0; i < mainBuffer.pageCount; i++) { |
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unsigned y1 = a / VIDEO_MODE_ROW_BYTES; |
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if (y1 >= VIDEO_MODE_Y) |
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y1 = VIDEO_MODE_Y - 1; |
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|
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unsigned y2 = (a + mainBuffer.pageSize) / VIDEO_MODE_ROW_BYTES; |
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if (y2 >= VIDEO_MODE_Y) |
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y2 = VIDEO_MODE_Y - 1; |
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|
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mainBuffer.pageInfo[i].top = y1; |
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mainBuffer.pageInfo[i].bottom = y2; |
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|
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a += mainBuffer.pageSize; |
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if (a > mainBuffer.memLength) |
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a = mainBuffer.memLength; |
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} |
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|
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// We can now write-protect the frame buffer |
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if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0) |
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return false; |
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|
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// The frame buffer is sane, i.e. there is no write to it yet |
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mainBuffer.dirty = false; |
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return true; |
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} |
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|
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|
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/* |
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* Deinitialize VOSF system |
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*/ |
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|
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static void video_vosf_exit(void) |
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{ |
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if (mainBuffer.pageInfo) { |
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free(mainBuffer.pageInfo); |
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mainBuffer.pageInfo = NULL; |
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} |
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if (mainBuffer.dirtyPages) { |
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free(mainBuffer.dirtyPages); |
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mainBuffer.dirtyPages = NULL; |
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} |
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} |
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|
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|
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/* |
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* Screen fault handler |
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*/ |
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|
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bool Screen_fault_handler(sigsegv_address_t fault_address, sigsegv_address_t fault_instruction) |
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{ |
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const uintptr addr = (uintptr)fault_address; |
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|
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/* Someone attempted to write to the frame buffer. Make it writeable |
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* now so that the data could actually be written to. It will be made |
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* read-only back in one of the screen update_*() functions. |
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*/ |
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if (((uintptr)addr - mainBuffer.memStart) < mainBuffer.memLength) { |
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const int page = ((uintptr)addr - mainBuffer.memStart) >> mainBuffer.pageBits; |
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LOCK_VOSF; |
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PFLAG_SET(page); |
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vm_protect((char *)(addr & -mainBuffer.pageSize), mainBuffer.pageSize, VM_PAGE_READ | VM_PAGE_WRITE); |
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mainBuffer.dirty = true; |
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UNLOCK_VOSF; |
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return true; |
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} |
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|
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/* Otherwise, we don't know how to handle the fault, let it crash */ |
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return false; |
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} |
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|
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|
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/* |
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* Update display for Windowed mode and VOSF |
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*/ |
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|
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/* How can we deal with array overrun conditions ? |
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|
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The state of the framebuffer pages that have been touched are maintained |
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in the dirtyPages[] table. That table is (pageCount + 2) bytes long. |
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|
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Terminology |
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|
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"Last Page" denotes the pageCount-nth page, i.e. dirtyPages[pageCount - 1]. |
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"CLEAR Page Guard" refers to the page following the Last Page but is always |
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in the CLEAR state. "SET Page Guard" refers to the page following the CLEAR |
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Page Guard but is always in the SET state. |
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|
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Rough process |
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|
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The update routines must determine which pages have to be blitted to the |
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screen. This job consists in finding the first_page that was touched. |
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i.e. find the next page that is SET. Then, finding how many pages were |
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touched starting from first_page. i.e. find the next page that is CLEAR. |
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|
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There are two cases to check: |
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|
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- Last Page is CLEAR: find_next_page_set() will reach the SET Page Guard |
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but it is beyond the valid pageCount value. Therefore, we exit from the |
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update routine. |
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|
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- Last Page is SET: first_page equals (pageCount - 1) and |
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find_next_page_clear() will reach the CLEAR Page Guard. We blit the last |
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page to the screen. On the next iteration, page equals pageCount and |
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find_next_page_set() will reach the SET Page Guard. We still safely exit |
| 364 |
from the update routine because the SET Page Guard position is greater |
| 365 |
than pageCount. |
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*/ |
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|
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static inline void update_display_window_vosf(VIDEO_DRV_INIT) |
| 369 |
{ |
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VIDEO_MODE_INIT; |
| 371 |
XDisplayLock(); |
| 372 |
|
| 373 |
int page = 0; |
| 374 |
for (;;) { |
| 375 |
const unsigned first_page = find_next_page_set(page); |
| 376 |
if (first_page >= mainBuffer.pageCount) |
| 377 |
break; |
| 378 |
|
| 379 |
page = find_next_page_clear(first_page); |
| 380 |
PFLAG_CLEAR_RANGE(first_page, page); |
| 381 |
|
| 382 |
// Make the dirty pages read-only again |
| 383 |
const int32 offset = first_page << mainBuffer.pageBits; |
| 384 |
const uint32 length = (page - first_page) << mainBuffer.pageBits; |
| 385 |
vm_protect((char *)mainBuffer.memStart + offset, length, VM_PAGE_READ); |
| 386 |
|
| 387 |
// There is at least one line to update |
| 388 |
const int y1 = mainBuffer.pageInfo[first_page].top; |
| 389 |
const int y2 = mainBuffer.pageInfo[page - 1].bottom; |
| 390 |
const int height = y2 - y1 + 1; |
| 391 |
|
| 392 |
VIDEO_DRV_LOCK_PIXELS; |
| 393 |
|
| 394 |
if ((int)VIDEO_MODE_DEPTH < VIDEO_DEPTH_8BIT) { |
| 395 |
|
| 396 |
// Update the_host_buffer and copy of the_buffer |
| 397 |
const int src_bytes_per_row = VIDEO_MODE_ROW_BYTES; |
| 398 |
const int dst_bytes_per_row = VIDEO_DRV_ROW_BYTES; |
| 399 |
const int pixels_per_byte = VIDEO_MODE_X / src_bytes_per_row; |
| 400 |
int i1 = y1 * src_bytes_per_row, i2 = y1 * dst_bytes_per_row, j; |
| 401 |
for (j = y1; j <= y2; j++) { |
| 402 |
Screen_blit(the_host_buffer + i2, the_buffer + i1, VIDEO_MODE_X / pixels_per_byte); |
| 403 |
i1 += src_bytes_per_row; |
| 404 |
i2 += dst_bytes_per_row; |
| 405 |
} |
| 406 |
|
| 407 |
} else { |
| 408 |
|
| 409 |
// Update the_host_buffer and copy of the_buffer |
| 410 |
const int src_bytes_per_row = VIDEO_MODE_ROW_BYTES; |
| 411 |
const int dst_bytes_per_row = VIDEO_DRV_ROW_BYTES; |
| 412 |
const int bytes_per_pixel = src_bytes_per_row / VIDEO_MODE_X; |
| 413 |
int i1 = y1 * src_bytes_per_row, i2 = y1 * dst_bytes_per_row, j; |
| 414 |
for (j = y1; j <= y2; j++) { |
| 415 |
Screen_blit(the_host_buffer + i2, the_buffer + i1, bytes_per_pixel * VIDEO_MODE_X); |
| 416 |
i1 += src_bytes_per_row; |
| 417 |
i2 += dst_bytes_per_row; |
| 418 |
} |
| 419 |
} |
| 420 |
|
| 421 |
VIDEO_DRV_UNLOCK_PIXELS; |
| 422 |
|
| 423 |
#ifdef USE_SDL_VIDEO |
| 424 |
SDL_UpdateRect(drv->s, 0, y1, VIDEO_MODE_X, height); |
| 425 |
#else |
| 426 |
if (VIDEO_DRV_HAVE_SHM) |
| 427 |
XShmPutImage(x_display, VIDEO_DRV_WINDOW, VIDEO_DRV_GC, VIDEO_DRV_IMAGE, 0, y1, 0, y1, VIDEO_MODE_X, height, 0); |
| 428 |
else |
| 429 |
XPutImage(x_display, VIDEO_DRV_WINDOW, VIDEO_DRV_GC, VIDEO_DRV_IMAGE, 0, y1, 0, y1, VIDEO_MODE_X, height); |
| 430 |
#endif |
| 431 |
} |
| 432 |
|
| 433 |
XDisplayUnlock(); |
| 434 |
mainBuffer.dirty = false; |
| 435 |
} |
| 436 |
|
| 437 |
|
| 438 |
/* |
| 439 |
* Update display for DGA mode and VOSF |
| 440 |
* (only in Real or Direct Addressing mode) |
| 441 |
*/ |
| 442 |
|
| 443 |
#if REAL_ADDRESSING || DIRECT_ADDRESSING |
| 444 |
static inline void update_display_dga_vosf(void) |
| 445 |
{ |
| 446 |
VIDEO_MODE_INIT; |
| 447 |
|
| 448 |
int page = 0; |
| 449 |
for (;;) { |
| 450 |
const unsigned first_page = find_next_page_set(page); |
| 451 |
if (first_page >= mainBuffer.pageCount) |
| 452 |
break; |
| 453 |
|
| 454 |
page = find_next_page_clear(first_page); |
| 455 |
PFLAG_CLEAR_RANGE(first_page, page); |
| 456 |
|
| 457 |
// Make the dirty pages read-only again |
| 458 |
const int32 offset = first_page << mainBuffer.pageBits; |
| 459 |
const uint32 length = (page - first_page) << mainBuffer.pageBits; |
| 460 |
vm_protect((char *)mainBuffer.memStart + offset, length, VM_PAGE_READ); |
| 461 |
|
| 462 |
// I am sure that y2 >= y1 and depth != 1 |
| 463 |
const int y1 = mainBuffer.pageInfo[first_page].top; |
| 464 |
const int y2 = mainBuffer.pageInfo[page - 1].bottom; |
| 465 |
|
| 466 |
const int bytes_per_row = VIDEO_MODE_ROW_BYTES; |
| 467 |
const int bytes_per_pixel = VIDEO_MODE_ROW_BYTES / VIDEO_MODE_X; |
| 468 |
int i, j; |
| 469 |
|
| 470 |
// Check for first column from left and first column |
| 471 |
// from right that have changed |
| 472 |
int x1 = VIDEO_MODE_X * bytes_per_pixel - 1; |
| 473 |
for (j = y1; j <= y2; j++) { |
| 474 |
uint8 * const p1 = &the_buffer[j * bytes_per_row]; |
| 475 |
uint8 * const p2 = &the_buffer_copy[j * bytes_per_row]; |
| 476 |
for (i = 0; i < x1; i++) { |
| 477 |
if (p1[i] != p2[i]) { |
| 478 |
x1 = i; |
| 479 |
break; |
| 480 |
} |
| 481 |
} |
| 482 |
} |
| 483 |
x1 /= bytes_per_pixel; |
| 484 |
|
| 485 |
int x2 = x1 * bytes_per_pixel; |
| 486 |
for (j = y2; j >= y1; j--) { |
| 487 |
uint8 * const p1 = &the_buffer[j * bytes_per_row]; |
| 488 |
uint8 * const p2 = &the_buffer_copy[j * bytes_per_row]; |
| 489 |
for (i = VIDEO_MODE_X * bytes_per_pixel - 1; i > x2; i--) { |
| 490 |
if (p1[i] != p2[i]) { |
| 491 |
x2 = i; |
| 492 |
break; |
| 493 |
} |
| 494 |
} |
| 495 |
} |
| 496 |
x2 /= bytes_per_pixel; |
| 497 |
|
| 498 |
// Update the_host_buffer and copy of the_buffer |
| 499 |
// There should be at least one pixel to copy |
| 500 |
VIDEO_DRV_LOCK_PIXELS; |
| 501 |
const int width = x2 - x1 + 1; |
| 502 |
i = y1 * bytes_per_row + x1 * bytes_per_pixel; |
| 503 |
for (j = y1; j <= y2; j++) { |
| 504 |
Screen_blit(the_host_buffer + i, the_buffer + i, bytes_per_pixel * width); |
| 505 |
memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * width); |
| 506 |
i += bytes_per_row; |
| 507 |
} |
| 508 |
VIDEO_DRV_UNLOCK_PIXELS; |
| 509 |
} |
| 510 |
mainBuffer.dirty = false; |
| 511 |
} |
| 512 |
#endif |
| 513 |
|
| 514 |
#endif /* ENABLE_VOSF */ |
| 515 |
|
| 516 |
#endif /* VIDEO_VOSF_H */ |
