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macemu/BasiliskII/src/CrossPlatform/video_vosf.h

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/*
* video_vosf.h - Video/graphics emulation, video on SEGV signals support
*
* Basilisk II (C) 1997-2008 Christian Bauer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef VIDEO_VOSF_H
#define VIDEO_VOSF_H
// Note: this file must be #include'd only in video_x.cpp
#ifdef ENABLE_VOSF
#include "sigsegv.h"
#include "vm_alloc.h"
#ifdef _WIN32
#include "util_windows.h"
#endif
// Import SDL-backend-specific functions
#ifdef USE_SDL_VIDEO
extern void update_sdl_video(SDL_Surface *screen, Sint32 x, Sint32 y, Sint32 w, Sint32 h);
extern void update_sdl_video(SDL_Surface *screen, int numrects, SDL_Rect *rects);
#endif
// Glue for SDL and X11 support
#ifdef TEST_VOSF_PERFORMANCE
#define MONITOR_INIT /* nothing */
#else
#ifdef USE_SDL_VIDEO
#define MONITOR_INIT SDL_monitor_desc &monitor
#define VIDEO_DRV_WIN_INIT driver_base *drv
#define VIDEO_DRV_DGA_INIT driver_base *drv
#define VIDEO_DRV_LOCK_PIXELS SDL_VIDEO_LOCK_SURFACE(drv->s)
#define VIDEO_DRV_UNLOCK_PIXELS SDL_VIDEO_UNLOCK_SURFACE(drv->s)
#define VIDEO_DRV_DEPTH drv->s->format->BitsPerPixel
#define VIDEO_DRV_WIDTH drv->s->w
#define VIDEO_DRV_HEIGHT drv->s->h
#define VIDEO_DRV_ROW_BYTES drv->s->pitch
#else
#ifdef SHEEPSHAVER
#define MONITOR_INIT /* nothing */
#define VIDEO_DRV_WIN_INIT /* nothing */
#define VIDEO_DRV_DGA_INIT /* nothing */
#define VIDEO_DRV_WINDOW the_win
#define VIDEO_DRV_GC the_gc
#define VIDEO_DRV_IMAGE img
#define VIDEO_DRV_HAVE_SHM have_shm
#else
#define MONITOR_INIT X11_monitor_desc &monitor
#define VIDEO_DRV_WIN_INIT driver_window *drv
#define VIDEO_DRV_DGA_INIT driver_dga *drv
#define VIDEO_DRV_WINDOW drv->w
#define VIDEO_DRV_GC drv->gc
#define VIDEO_DRV_IMAGE drv->img
#define VIDEO_DRV_HAVE_SHM drv->have_shm
#endif
#define VIDEO_DRV_LOCK_PIXELS /* nothing */
#define VIDEO_DRV_UNLOCK_PIXELS /* nothing */
#define VIDEO_DRV_DEPTH VIDEO_DRV_IMAGE->depth
#define VIDEO_DRV_WIDTH VIDEO_DRV_IMAGE->width
#define VIDEO_DRV_HEIGHT VIDEO_DRV_IMAGE->height
#define VIDEO_DRV_ROW_BYTES VIDEO_DRV_IMAGE->bytes_per_line
#endif
#endif
// Prototypes
static void vosf_do_set_dirty_area(uintptr first, uintptr last);
static void vosf_set_dirty_area(int x, int y, int w, int h, unsigned screen_width, unsigned screen_height, unsigned bytes_per_row);
// Variables for Video on SEGV support
static uint8 *the_host_buffer; // Host frame buffer in VOSF mode
struct ScreenPageInfo {
unsigned top, bottom; // Mapping between this virtual page and Mac scanlines
};
struct ScreenInfo {
uintptr memStart; // Start address aligned to page boundary
uint32 memLength; // Length of the memory addressed by the screen pages
uintptr pageSize; // Size of a page
int pageBits; // Shift count to get the page number
uint32 pageCount; // Number of pages allocated to the screen
bool dirty; // Flag: set if the frame buffer was touched
bool very_dirty; // Flag: set if the frame buffer was completely modified (e.g. colormap changes)
char * dirtyPages; // Table of flags set if page was altered
ScreenPageInfo * pageInfo; // Table of mappings page -> Mac scanlines
};
static ScreenInfo mainBuffer;
#define PFLAG_SET_VALUE 0x00
#define PFLAG_CLEAR_VALUE 0x01
#define PFLAG_SET_VALUE_4 0x00000000
#define PFLAG_CLEAR_VALUE_4 0x01010101
#define PFLAG_SET(page) mainBuffer.dirtyPages[page] = PFLAG_SET_VALUE
#define PFLAG_CLEAR(page) mainBuffer.dirtyPages[page] = PFLAG_CLEAR_VALUE
#define PFLAG_ISSET(page) (mainBuffer.dirtyPages[page] == PFLAG_SET_VALUE)
#define PFLAG_ISCLEAR(page) (mainBuffer.dirtyPages[page] != PFLAG_SET_VALUE)
#ifdef UNALIGNED_PROFITABLE
# define PFLAG_ISSET_4(page) (*((uint32 *)(mainBuffer.dirtyPages + (page))) == PFLAG_SET_VALUE_4)
# define PFLAG_ISCLEAR_4(page) (*((uint32 *)(mainBuffer.dirtyPages + (page))) == PFLAG_CLEAR_VALUE_4)
#else
# define PFLAG_ISSET_4(page) \
PFLAG_ISSET(page ) && PFLAG_ISSET(page+1) \
&& PFLAG_ISSET(page+2) && PFLAG_ISSET(page+3)
# define PFLAG_ISCLEAR_4(page) \
PFLAG_ISCLEAR(page ) && PFLAG_ISCLEAR(page+1) \
&& PFLAG_ISCLEAR(page+2) && PFLAG_ISCLEAR(page+3)
#endif
// Set the selected page range [ first_page, last_page [ into the SET state
#define PFLAG_SET_RANGE(first_page, last_page) \
memset(mainBuffer.dirtyPages + (first_page), PFLAG_SET_VALUE, \
(last_page) - (first_page))
// Set the selected page range [ first_page, last_page [ into the CLEAR state
#define PFLAG_CLEAR_RANGE(first_page, last_page) \
memset(mainBuffer.dirtyPages + (first_page), PFLAG_CLEAR_VALUE, \
(last_page) - (first_page))
#define PFLAG_SET_ALL do { \
PFLAG_SET_RANGE(0, mainBuffer.pageCount); \
mainBuffer.dirty = true; \
} while (0)
#define PFLAG_CLEAR_ALL do { \
PFLAG_CLEAR_RANGE(0, mainBuffer.pageCount); \
mainBuffer.dirty = false; \
mainBuffer.very_dirty = false; \
} while (0)
#define PFLAG_SET_VERY_DIRTY do { \
mainBuffer.very_dirty = true; \
} while (0)
// Set the following macro definition to 1 if your system
// provides a really fast strchr() implementation
//#define HAVE_FAST_STRCHR 0
static inline unsigned find_next_page_set(unsigned page)
{
#if HAVE_FAST_STRCHR
char *match = strchr(mainBuffer.dirtyPages + page, PFLAG_SET_VALUE);
return match ? match - mainBuffer.dirtyPages : mainBuffer.pageCount;
#else
while (PFLAG_ISCLEAR_4(page))
page += 4;
while (PFLAG_ISCLEAR(page))
page++;
return page;
#endif
}
static inline unsigned find_next_page_clear(unsigned page)
{
#if HAVE_FAST_STRCHR
char *match = strchr(mainBuffer.dirtyPages + page, PFLAG_CLEAR_VALUE);
return match ? match - mainBuffer.dirtyPages : mainBuffer.pageCount;
#else
while (PFLAG_ISSET_4(page))
page += 4;
while (PFLAG_ISSET(page))
page++;
return page;
#endif
}
#if defined(HAVE_PTHREADS)
static pthread_mutex_t vosf_lock = PTHREAD_MUTEX_INITIALIZER; // Mutex to protect frame buffer (dirtyPages in fact)
#define LOCK_VOSF pthread_mutex_lock(&vosf_lock);
#define UNLOCK_VOSF pthread_mutex_unlock(&vosf_lock);
#elif defined(_WIN32)
static mutex_t vosf_lock; // Mutex to protect frame buffer (dirtyPages in fact)
#define LOCK_VOSF vosf_lock.lock();
#define UNLOCK_VOSF vosf_lock.unlock();
#elif defined(HAVE_SPINLOCKS)
static spinlock_t vosf_lock = SPIN_LOCK_UNLOCKED; // Mutex to protect frame buffer (dirtyPages in fact)
#define LOCK_VOSF spin_lock(&vosf_lock)
#define UNLOCK_VOSF spin_unlock(&vosf_lock)
#else
#define LOCK_VOSF
#define UNLOCK_VOSF
#endif
static int log_base_2(uint32 x)
{
uint32 mask = 0x80000000;
int l = 31;
while (l >= 0 && (x & mask) == 0) {
mask >>= 1;
l--;
}
return l;
}
// Extend size to page boundary
static uint32 page_extend(uint32 size)
{
const uint32 page_size = vm_get_page_size();
const uint32 page_mask = page_size - 1;
return (size + page_mask) & ~page_mask;
}
/*
* Check if VOSF acceleration is profitable on this platform
*/
#ifndef VOSF_PROFITABLE_TRIES
#define VOSF_PROFITABLE_TRIES VOSF_PROFITABLE_TRIES_DFL
#endif
const int VOSF_PROFITABLE_TRIES_DFL = 3; // Make 3 attempts for full screen update
const int VOSF_PROFITABLE_THRESHOLD = 16667/2; // 60 Hz (half of the quantum)
static bool video_vosf_profitable(uint32 *duration_p = NULL, uint32 *n_page_faults_p = NULL)
{
uint32 duration = 0;
uint32 n_tries = VOSF_PROFITABLE_TRIES;
const uint32 n_page_faults = mainBuffer.pageCount * n_tries;
#ifdef SHEEPSHAVER
const bool accel = PrefsFindBool("gfxaccel");
#else
const bool accel = false;
#endif
for (uint32 i = 0; i < n_tries; i++) {
uint64 start = GetTicks_usec();
for (uint32 p = 0; p < mainBuffer.pageCount; p++) {
uint8 *addr = (uint8 *)(mainBuffer.memStart + (p * mainBuffer.pageSize));
if (accel)
vosf_do_set_dirty_area((uintptr)addr, (uintptr)addr + mainBuffer.pageSize - 1);
else
addr[0] = 0; // Trigger Screen_fault_handler()
}
duration += uint32(GetTicks_usec() - start);
PFLAG_CLEAR_ALL;
mainBuffer.dirty = false;
if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0)
return false;
}
if (duration_p)
*duration_p = duration;
if (n_page_faults_p)
*n_page_faults_p = n_page_faults;
D(bug("Triggered %d page faults in %ld usec (%.1f usec per fault)\n", n_page_faults, duration, double(duration) / double(n_page_faults)));
return ((duration / n_tries) < (VOSF_PROFITABLE_THRESHOLD * (frame_skip ? frame_skip : 1)));
}
/*
* Initialize the VOSF system (mainBuffer structure, SIGSEGV handler)
*/
static bool video_vosf_init(MONITOR_INIT)
{
VIDEO_MODE_INIT_MONITOR;
const uintptr page_size = vm_get_page_size();
const uintptr page_mask = page_size - 1;
// Round up frame buffer base to page boundary
mainBuffer.memStart = (((uintptr) the_buffer) + page_mask) & ~page_mask;
// The frame buffer size shall already be aligned to page boundary (use page_extend)
mainBuffer.memLength = the_buffer_size;
mainBuffer.pageSize = page_size;
mainBuffer.pageBits = log_base_2(mainBuffer.pageSize);
mainBuffer.pageCount = (mainBuffer.memLength + page_mask)/mainBuffer.pageSize;
// The "2" more bytes requested are a safety net to insure the
// loops in the update routines will terminate.
// See "How can we deal with array overrun conditions ?" hereunder for further details.
mainBuffer.dirtyPages = (char *) malloc(mainBuffer.pageCount + 2);
if (mainBuffer.dirtyPages == NULL)
return false;
PFLAG_CLEAR_ALL;
PFLAG_CLEAR(mainBuffer.pageCount);
PFLAG_SET(mainBuffer.pageCount+1);
// Allocate and fill in pageInfo with start and end (inclusive) row in number of bytes
mainBuffer.pageInfo = (ScreenPageInfo *) malloc(mainBuffer.pageCount * sizeof(ScreenPageInfo));
if (mainBuffer.pageInfo == NULL)
return false;
uint32 a = 0;
for (unsigned i = 0; i < mainBuffer.pageCount; i++) {
unsigned y1 = a / VIDEO_MODE_ROW_BYTES;
if (y1 >= VIDEO_MODE_Y)
y1 = VIDEO_MODE_Y - 1;
unsigned y2 = (a + mainBuffer.pageSize) / VIDEO_MODE_ROW_BYTES;
if (y2 >= VIDEO_MODE_Y)
y2 = VIDEO_MODE_Y - 1;
mainBuffer.pageInfo[i].top = y1;
mainBuffer.pageInfo[i].bottom = y2;
a += mainBuffer.pageSize;
if (a > mainBuffer.memLength)
a = mainBuffer.memLength;
}
// We can now write-protect the frame buffer
if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0)
return false;
// The frame buffer is sane, i.e. there is no write to it yet
mainBuffer.dirty = false;
return true;
}
/*
* Deinitialize VOSF system
*/
static void video_vosf_exit(void)
{
if (mainBuffer.pageInfo) {
free(mainBuffer.pageInfo);
mainBuffer.pageInfo = NULL;
}
if (mainBuffer.dirtyPages) {
free(mainBuffer.dirtyPages);
mainBuffer.dirtyPages = NULL;
}
}
/*
* Update VOSF state with specified dirty area
*/
static void vosf_do_set_dirty_area(uintptr first, uintptr last)
{
const int first_page = (first - mainBuffer.memStart) >> mainBuffer.pageBits;
const int last_page = (last - mainBuffer.memStart) >> mainBuffer.pageBits;
uint8 *addr = (uint8 *)(first & ~(mainBuffer.pageSize - 1));
for (int i = first_page; i <= last_page; i++) {
if (PFLAG_ISCLEAR(i)) {
PFLAG_SET(i);
vm_protect(addr, mainBuffer.pageSize, VM_PAGE_READ | VM_PAGE_WRITE);
}
addr += mainBuffer.pageSize;
}
}
static void vosf_set_dirty_area(int x, int y, int w, int h, unsigned screen_width, unsigned screen_height, unsigned bytes_per_row)
{
if (x < 0) {
w -= -x;
x = 0;
}
if (y < 0) {
h -= -y;
y = 0;
}
if (w <= 0 || h <= 0)
return;
if (unsigned(x + w) > screen_width)
w -= unsigned(x + w) - screen_width;
if (unsigned(y + h) > screen_height)
h -= unsigned(y + h) - screen_height;
LOCK_VOSF;
if (bytes_per_row >= screen_width) {
const int bytes_per_pixel = bytes_per_row / screen_width;
if (bytes_per_row <= mainBuffer.pageSize) {
const uintptr a0 = mainBuffer.memStart + y * bytes_per_row + x * bytes_per_pixel;
const uintptr a1 = mainBuffer.memStart + (y + h - 1) * bytes_per_row + (x + w - 1) * bytes_per_pixel;
vosf_do_set_dirty_area(a0, a1);
} else {
for (int j = y; j < y + h; j++) {
const uintptr a0 = mainBuffer.memStart + j * bytes_per_row + x * bytes_per_pixel;
const uintptr a1 = a0 + (w - 1) * bytes_per_pixel;
vosf_do_set_dirty_area(a0, a1);
}
}
} else {
const int pixels_per_byte = screen_width / bytes_per_row;
if (bytes_per_row <= mainBuffer.pageSize) {
const uintptr a0 = mainBuffer.memStart + y * bytes_per_row + x / pixels_per_byte;
const uintptr a1 = mainBuffer.memStart + (y + h - 1) * bytes_per_row + (x + w - 1) / pixels_per_byte;
vosf_do_set_dirty_area(a0, a1);
} else {
for (int j = y; j < y + h; j++) {
const uintptr a0 = mainBuffer.memStart + j * bytes_per_row + x / pixels_per_byte;
const uintptr a1 = mainBuffer.memStart + j * bytes_per_row + (x + w - 1) / pixels_per_byte;
vosf_do_set_dirty_area(a0, a1);
}
}
}
mainBuffer.dirty = true;
UNLOCK_VOSF;
}
/*
* Screen fault handler
*/
bool Screen_fault_handler(sigsegv_info_t *sip)
{
const uintptr addr = (uintptr)sigsegv_get_fault_address(sip);
/* Someone attempted to write to the frame buffer. Make it writeable
* now so that the data could actually be written to. It will be made
* read-only back in one of the screen update_*() functions.
*/
if (((uintptr)addr - mainBuffer.memStart) < mainBuffer.memLength) {
const int page = ((uintptr)addr - mainBuffer.memStart) >> mainBuffer.pageBits;
LOCK_VOSF;
if (PFLAG_ISCLEAR(page)) {
PFLAG_SET(page);
vm_protect((char *)(addr & ~(mainBuffer.pageSize - 1)), mainBuffer.pageSize, VM_PAGE_READ | VM_PAGE_WRITE);
}
mainBuffer.dirty = true;
UNLOCK_VOSF;
return true;
}
/* Otherwise, we don't know how to handle the fault, let it crash */
return false;
}
/*
* Update display for Windowed mode and VOSF
*/
/* How can we deal with array overrun conditions ?
The state of the framebuffer pages that have been touched are maintained
in the dirtyPages[] table. That table is (pageCount + 2) bytes long.
Terminology
"Last Page" denotes the pageCount-nth page, i.e. dirtyPages[pageCount - 1].
"CLEAR Page Guard" refers to the page following the Last Page but is always
in the CLEAR state. "SET Page Guard" refers to the page following the CLEAR
Page Guard but is always in the SET state.
Rough process
The update routines must determine which pages have to be blitted to the
screen. This job consists in finding the first_page that was touched.
i.e. find the next page that is SET. Then, finding how many pages were
touched starting from first_page. i.e. find the next page that is CLEAR.
There are two cases to check:
- Last Page is CLEAR: find_next_page_set() will reach the SET Page Guard
but it is beyond the valid pageCount value. Therefore, we exit from the
update routine.
- Last Page is SET: first_page equals (pageCount - 1) and
find_next_page_clear() will reach the CLEAR Page Guard. We blit the last
page to the screen. On the next iteration, page equals pageCount and
find_next_page_set() will reach the SET Page Guard. We still safely exit
from the update routine because the SET Page Guard position is greater
than pageCount.
*/
#ifndef TEST_VOSF_PERFORMANCE
static void update_display_window_vosf(VIDEO_DRV_WIN_INIT)
{
VIDEO_MODE_INIT;
unsigned page = 0;
for (;;) {
const unsigned first_page = find_next_page_set(page);
if (first_page >= mainBuffer.pageCount)
break;
page = find_next_page_clear(first_page);
PFLAG_CLEAR_RANGE(first_page, page);
// Make the dirty pages read-only again
const int32 offset = first_page << mainBuffer.pageBits;
const uint32 length = (page - first_page) << mainBuffer.pageBits;
vm_protect((char *)mainBuffer.memStart + offset, length, VM_PAGE_READ);
// There is at least one line to update
const int y1 = mainBuffer.pageInfo[first_page].top;
const int y2 = mainBuffer.pageInfo[page - 1].bottom;
const int height = y2 - y1 + 1;
// Update the_host_buffer
VIDEO_DRV_LOCK_PIXELS;
const int src_bytes_per_row = VIDEO_MODE_ROW_BYTES;
const int dst_bytes_per_row = VIDEO_DRV_ROW_BYTES;
int i1 = y1 * src_bytes_per_row, i2 = y1 * dst_bytes_per_row, j;
for (j = y1; j <= y2; j++) {
Screen_blit(the_host_buffer + i2, the_buffer + i1, src_bytes_per_row);
i1 += src_bytes_per_row;
i2 += dst_bytes_per_row;
}
VIDEO_DRV_UNLOCK_PIXELS;
#ifdef USE_SDL_VIDEO
update_sdl_video(drv->s, 0, y1, VIDEO_MODE_X, height);
#else
if (VIDEO_DRV_HAVE_SHM)
XShmPutImage(x_display, VIDEO_DRV_WINDOW, VIDEO_DRV_GC, VIDEO_DRV_IMAGE, 0, y1, 0, y1, VIDEO_MODE_X, height, 0);
else
XPutImage(x_display, VIDEO_DRV_WINDOW, VIDEO_DRV_GC, VIDEO_DRV_IMAGE, 0, y1, 0, y1, VIDEO_MODE_X, height);
#endif
}
mainBuffer.dirty = false;
}
#endif
/*
* Update display for DGA mode and VOSF
* (only in Real or Direct Addressing mode)
*/
#ifndef TEST_VOSF_PERFORMANCE
#if REAL_ADDRESSING || DIRECT_ADDRESSING
static void update_display_dga_vosf(VIDEO_DRV_DGA_INIT)
{
VIDEO_MODE_INIT;
// Compute number of bytes per row, take care to virtual screens
const int src_bytes_per_row = VIDEO_MODE_ROW_BYTES;
const int dst_bytes_per_row = TrivialBytesPerRow(VIDEO_MODE_X, DepthModeForPixelDepth(VIDEO_DRV_DEPTH));
const int scr_bytes_per_row = VIDEO_DRV_ROW_BYTES;
assert(dst_bytes_per_row <= scr_bytes_per_row);
const int scr_bytes_left = scr_bytes_per_row - dst_bytes_per_row;
// Full screen update requested?
if (mainBuffer.very_dirty) {
PFLAG_CLEAR_ALL;
vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ);
memcpy(the_buffer_copy, the_buffer, VIDEO_MODE_ROW_BYTES * VIDEO_MODE_Y);
VIDEO_DRV_LOCK_PIXELS;
int i1 = 0, i2 = 0;
for (uint32_t j = 0; j < VIDEO_MODE_Y; j++) {
Screen_blit(the_host_buffer + i2, the_buffer + i1, src_bytes_per_row);
i1 += src_bytes_per_row;
i2 += scr_bytes_per_row;
}
#ifdef USE_SDL_VIDEO
update_sdl_video(drv->s, 0, 0, VIDEO_MODE_X, VIDEO_MODE_Y);
#endif
VIDEO_DRV_UNLOCK_PIXELS;
return;
}
// Setup partial blitter (use 64-pixel wide chunks)
const uint32 n_pixels = 64;
const uint32 n_chunks = VIDEO_MODE_X / n_pixels;
const uint32 n_pixels_left = VIDEO_MODE_X - (n_chunks * n_pixels);
const uint32 src_chunk_size = TrivialBytesPerRow(n_pixels, VIDEO_MODE_DEPTH);
const uint32 dst_chunk_size = TrivialBytesPerRow(n_pixels, DepthModeForPixelDepth(VIDEO_DRV_DEPTH));
assert(src_chunk_size * n_chunks <= src_bytes_per_row);
assert(dst_chunk_size * n_chunks <= dst_bytes_per_row);
const uint32 src_chunk_size_left = src_bytes_per_row - (n_chunks * src_chunk_size);
const uint32 dst_chunk_size_left = dst_bytes_per_row - (n_chunks * dst_chunk_size);
unsigned page = 0;
uint32 last_scanline = uint32(-1);
for (;;) {
const unsigned first_page = find_next_page_set(page);
if (first_page >= mainBuffer.pageCount)
break;
page = find_next_page_clear(first_page);
PFLAG_CLEAR_RANGE(first_page, page);
// Make the dirty pages read-only again
const int32 offset = first_page << mainBuffer.pageBits;
const uint32 length = (page - first_page) << mainBuffer.pageBits;
vm_protect((char *)mainBuffer.memStart + offset, length, VM_PAGE_READ);
// Optimized for scanlines, don't process overlapping lines again
uint32 y1 = mainBuffer.pageInfo[first_page].top;
uint32 y2 = mainBuffer.pageInfo[page - 1].bottom;
if (last_scanline != uint32(-1)) {
if (y1 <= last_scanline && ++y1 >= VIDEO_MODE_Y)
continue;
if (y2 <= last_scanline && ++y2 >= VIDEO_MODE_Y)
continue;
}
last_scanline = y2;
// Update the_host_buffer and copy of the_buffer, one line at a time
uint32 i1 = y1 * src_bytes_per_row;
uint32 i2 = y1 * scr_bytes_per_row;
#ifdef USE_SDL_VIDEO
int bbi = 0;
SDL_Rect bb[3] = {
{ Sint16(VIDEO_MODE_X), Sint16(y1), 0, 0 },
{ Sint16(VIDEO_MODE_X), -1, 0, 0 },
{ Sint16(VIDEO_MODE_X), -1, 0, 0 }
};
#endif
VIDEO_DRV_LOCK_PIXELS;
for (uint32 j = y1; j <= y2; j++) {
for (uint32 i = 0; i < n_chunks; i++) {
if (memcmp(the_buffer_copy + i1, the_buffer + i1, src_chunk_size) != 0) {
memcpy(the_buffer_copy + i1, the_buffer + i1, src_chunk_size);
Screen_blit(the_host_buffer + i2, the_buffer + i1, src_chunk_size);
#ifdef USE_SDL_VIDEO
const int x = i * n_pixels;
if (x < bb[bbi].x) {
if (bb[bbi].w)
bb[bbi].w += bb[bbi].x - x;
else
bb[bbi].w = n_pixels;
bb[bbi].x = x;
}
else if (x >= bb[bbi].x + bb[bbi].w)
bb[bbi].w = x + n_pixels - bb[bbi].x;
#endif
}
i1 += src_chunk_size;
i2 += dst_chunk_size;
}
if (src_chunk_size_left && dst_chunk_size_left) {
if (memcmp(the_buffer_copy + i1, the_buffer + i1, src_chunk_size_left) != 0) {
memcpy(the_buffer_copy + i1, the_buffer + i1, src_chunk_size_left);
Screen_blit(the_host_buffer + i2, the_buffer + i1, src_chunk_size_left);
}
#ifdef USE_SDL_VIDEO
const int x = n_chunks * n_pixels;
if (x < bb[bbi].x) {
if (bb[bbi].w)
bb[bbi].w += bb[bbi].x - x;
else
bb[bbi].w = n_pixels_left;
bb[bbi].x = x;
}
else if (x >= bb[bbi].x + bb[bbi].w)
bb[bbi].w = x + n_pixels_left - bb[bbi].x;
#endif
}
i1 += src_chunk_size_left;
i2 += dst_chunk_size_left + scr_bytes_left;
#ifdef USE_SDL_VIDEO
bb[bbi].h++;
if (bb[bbi].w && (j == y1 || j == y2 - 1 || j == y2)) {
bbi++;
assert(bbi <= 3);
if (j != y2)
bb[bbi].y = j + 1;
}
#endif
}
#ifdef USE_SDL_VIDEO
update_sdl_video(drv->s, bbi, bb);
#endif
VIDEO_DRV_UNLOCK_PIXELS;
}
mainBuffer.dirty = false;
}
#endif
#endif
#endif /* ENABLE_VOSF */
#endif /* VIDEO_VOSF_H */
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