src/Unix/video_vosf.h

/*
 *  video_vosf.h - Video/graphics emulation, video on SEGV signals support
 *
 *  Basilisk II (C) 1997-2000 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 is #include'd in video_x.cpp
#ifdef ENABLE_VOSF

/*
 *  Page-aligned memory allocation
 */

// Align on page boundaries
static uintptr align_on_page_boundary(uintptr size)
{
        const uint32 page_size = getpagesize();
        const uint32 page_mask = page_size - 1;
        return (size + page_mask) & ~page_mask;
}

// Allocate memory on page boundary
static void * allocate_framebuffer(uint32 size, uint8 * hint = 0)
{
        // Remind that the system can allocate at 0x00000000...
        return mmap((caddr_t)hint, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, zero_fd, 0);
}


/*
 *      Screen depth identification
 */

enum {
        ID_DEPTH_UNKNOWN = -1,
        ID_DEPTH_1,
        ID_DEPTH_8,
        ID_DEPTH_15,
        ID_DEPTH_16,
        ID_DEPTH_24,
        ID_DEPTH_32 = ID_DEPTH_24,
        ID_DEPTH_COUNT
};

static int depth_id(int depth)
{
        int id;
        switch (depth) {
                case 1  : id = ID_DEPTH_1;      break;
                case 8  : id = ID_DEPTH_8;      break;
                case 15 : id = ID_DEPTH_15;     break;
                case 16 : id = ID_DEPTH_16;     break;
                case 24 : id = ID_DEPTH_24;     break;
                case 32 : id = ID_DEPTH_32;     break;
                default : id = ID_DEPTH_UNKNOWN;
        }
        return id;
}


/*
 *      Frame buffer copy function templates
 */

// No conversion required

#define MEMCPY_PROFITABLE
#ifdef MEMCPY_PROFITABLE
static void do_fbcopy_raw(uint8 * dest, const uint8 * source, uint32 length)
{
        memcpy(dest, source, length);
}
#else
#define FB_BLIT_1(dst, src)     (dst = (src))
#define FB_BLIT_2(dst, src)     (dst = (src))
#define FB_DEPTH                        0
#define FB_FUNC_NAME            do_fbcopy_raw
#include "video_blit.h"
#endif


// RGB 555

#ifdef WORDS_BIGENDIAN
# define FB_FUNC_NAME do_fbcopy_15_obo
#else
# define FB_FUNC_NAME do_fbcopy_15_nbo
#endif

#define FB_BLIT_1(dst, src) \
        (dst = (((src) >> 8) & 0xff) | (((src) & 0xff) << 8))
        
#define FB_BLIT_2(dst, src) \
        (dst = (((src) >> 8) & 0x00ff00ff) | (((src) & 0x00ff00ff) << 8))

#define FB_DEPTH 15
#include "video_blit.h"


// RGB 565

#ifdef WORDS_BIGENDIAN

// native byte order

#define FB_BLIT_1(dst, src) \
        (dst = (((src) & 0x1f) | (((src) << 1) & 0xffc0)))

#define FB_BLIT_2(dst, src) \
        (dst = (((src) & 0x001f001f) | (((src) << 1) & 0xffc0ffc0)))

#define FB_DEPTH 16
#define FB_FUNC_NAME do_fbcopy_16_nbo
#include "video_blit.h"

// opposite byte order (untested)

#define FB_BLIT_1(dst, src) \
        (dst = ((((src) >> 6) & 0xff) | (((src) & 0x60) << 9)))

#define FB_BLIT_2(dst, src) \
        (dst = ((((src) >> 6) & 0x00ff00ff) | (((src) & 0x00600060) << 9)))

#define FB_DEPTH 16
#define FB_FUNC_NAME do_fbcopy_16_obo
#include "video_blit.h"

#else

// native byte order

#define FB_BLIT_1(dst, src) \
        (dst = (((src) >> 8) & 0x001f) | (((src) << 9) & 0xfe00) | (((src) >> 7) & 0x01c0))
        
#define FB_BLIT_2(dst, src) \
        (dst = (((src) >> 8) & 0x001f001f) | (((src) << 9) & 0xfe00fe00) | (((src) >> 7) & 0x01c001c0))

#define FB_DEPTH 16
#define FB_FUNC_NAME do_fbcopy_16_nbo
#include "video_blit.h"

// opposite byte order (untested)

#define FB_BLIT_1(dst, src) \
        (dst = (((src) & 0x1f00) | (((src) << 1) & 0xe0fe) | (((src) >> 15) & 1)))

#define FB_BLIT_2(dst, src) \
        (dst = (((src) & 0x1f001f00) | (((src) << 1) & 0xe0fee0fe) | (((src) >> 15) & 0x10001)))

#define FB_DEPTH 16
#define FB_FUNC_NAME do_fbcopy_16_obo
#include "video_blit.h"

#endif

// RGB 888

#ifdef WORDS_BIGENDIAN
# define FB_FUNC_NAME do_fbcopy_24_obo
#else
# define FB_FUNC_NAME do_fbcopy_24_nbo
#endif

#define FB_BLIT_1(dst, src) \
        (dst = (src))

#define FB_BLIT_2(dst, src) \
        (dst = (((src) >> 24) & 0xff) | (((src) >> 8) & 0xff00) | (((src) & 0xff00) << 8) | (((src) & 0xff) << 24))

#define FB_DEPTH 24
#include "video_blit.h"


/*
 *      Frame buffer copy functions map table
 */

typedef void (*fbcopy_func)(uint8 *, const uint8 *, uint32);
static fbcopy_func do_update_framebuffer;

#define FBCOPY_FUNC(aHandler) do_ ## aHandler

#if REAL_ADDRESSING || DIRECT_ADDRESSING
#define WD(X) { FBCOPY_FUNC(X), FBCOPY_FUNC(X) }
#else
#define WD(X) { FBCOPY_FUNC(fbcopy_raw), FBCOPY_FUNC(fbcopy_raw) }
#endif

// fb_copy_funcs[depth_id][native_byte_order][dga_mode]
// NT  : not tested
// OK  : has been successfully tested
// NBO : native byte order
// OBO : opposite byte order
static fbcopy_func fbcopy_funcs[ID_DEPTH_COUNT][2][2] = {
#ifdef WORDS_BIGENDIAN
                                /*      opposite byte order             native byte order       */
/*  1 bpp */    {       WD(fbcopy_raw)          ,       WD(fbcopy_raw)          },      // NT
/*  8 bpp */    {       WD(fbcopy_raw)          ,       WD(fbcopy_raw)          },      // OK (NBO)
/* 15 bpp */    {       WD(fbcopy_15_obo)       ,       WD(fbcopy_raw)          },      // NT
/* 16 bpp */    {       WD(fbcopy_16_obo)       ,       WD(fbcopy_16_nbo)       },      // NT
/* 24 bpp */    {       WD(fbcopy_24_obo)       ,       WD(fbcopy_raw)          }       // NT
#else
                                /*      opposite byte order             native byte order       */
/*  1 bpp */    {       WD(fbcopy_raw)          ,       WD(fbcopy_raw)          },      // NT
/*  8 bpp */    {       WD(fbcopy_raw)          ,       WD(fbcopy_raw)          },      // OK (NBO)
/* 15 bpp */    {       WD(fbcopy_raw)          ,       WD(fbcopy_15_nbo)       },      // OK (NBO)
/* 16 bpp */    {       WD(fbcopy_16_obo)       ,       WD(fbcopy_16_nbo)       },      // OK (NBO)
/* 24 bpp */    {       WD(fbcopy_raw)          ,       WD(fbcopy_24_nbo)       }       // NT
#endif
};

#undef WD

#define FBCOPY_FUNC_ERROR \
        ErrorAlert("Invalid screen depth")

#define GET_FBCOPY_FUNC(aDepth, aNativeByteOrder, aDisplay) \
        ((depth_id(aDepth) == ID_DEPTH_UNKNOWN) ? ( FBCOPY_FUNC_ERROR, (fbcopy_func)0 ) : \
        fbcopy_funcs[depth_id(aDepth)][(aNativeByteOrder)][(aDisplay) == DISPLAY_DGA ? 1 : 0])


/*
 *      Screen fault handler
 */

static inline void do_handle_screen_fault(uintptr addr)
{
        if ((addr < mainBuffer.memStart) || (addr >= mainBuffer.memEnd)) {
                fprintf(stderr, "Segmentation fault at 0x%08X\n", addr);
                abort();
        }
        
        const int page  = (addr - mainBuffer.memStart) >> mainBuffer.pageBits;
        caddr_t page_ad = (caddr_t)(addr & ~(mainBuffer.pageSize - 1));
#ifdef HAVE_PTHREADS
        pthread_mutex_lock(&Screen_draw_lock);
#endif
        PFLAG_SET(page);
        mprotect(page_ad, mainBuffer.pageSize, PROT_READ | PROT_WRITE);
#ifdef HAVE_PTHREADS
        pthread_mutex_unlock(&Screen_draw_lock);
#endif
}

#if defined(HAVE_SIGINFO_T)

static void Screen_fault_handler(int, siginfo_t * sip, void *)
{
        D(bug("Screen_fault_handler: ADDR=0x%08X\n", sip->si_addr));
        do_handle_screen_fault((uintptr)sip->si_addr);
}

#elif defined(HAVE_SIGCONTEXT_SUBTERFUGE)

# if defined(__i386__) && defined(__linux__)
static void Screen_fault_handler(int, struct sigcontext scs)
{
        D(bug("Screen_fault_handler: ADDR=0x%08X from IP=0x%08X\n", scs.cr2, scs.eip));
        do_handle_screen_fault((uintptr)scs.cr2);
}

# elif defined(__m68k__) && defined(__NetBSD__)

# include <m68k/frame.h>
static void Screen_fault_handler(int, int code, struct sigcontext *scp)
{
        D(bug("Screen_fault_handler: ADDR=0x%08X\n", code));
        struct sigstate {
                int ss_flags;
                struct frame ss_frame;
        };
        struct sigstate *state = (struct sigstate *)scp->sc_ap;
        uintptr fault_addr;
        switch (state->ss_frame.f_format) {
                case 7:         // 68040 access error
                        // "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown
                        fault_addr = state->ss_frame.f_fmt7.f_fa;
                        break;
                default:
                        fault_addr = (uintptr)code;
                        break;
        }
        do_handle_screen_fault(fault_addr);
}

# else
#  error "No suitable subterfuge for Video on SEGV signals"
# endif
#else
# error "Can't do Video on SEGV signals"
#endif


/*
 *      Screen fault handler initialization
 */

#if defined(HAVE_SIGINFO_T)
static bool Screen_fault_handler_init()
{
        // Setup SIGSEGV handler to process writes to frame buffer
        sigemptyset(&vosf_sa.sa_mask);
        vosf_sa.sa_sigaction = Screen_fault_handler;
        vosf_sa.sa_flags = SA_SIGINFO;
        return (sigaction(SIGSEGV, &vosf_sa, NULL) == 0);
}
#elif defined(HAVE_SIGCONTEXT_SUBTERFUGE)
static bool Screen_fault_handler_init()
{
        // Setup SIGSEGV handler to process writes to frame buffer
        sigemptyset(&vosf_sa.sa_mask);
        vosf_sa.sa_handler = (void (*)(int)) Screen_fault_handler;
#if !EMULATED_68K && defined(__NetBSD__)
        sigaddset(&vosf_sa.sa_mask, SIGALRM);
        vosf_sa.sa_flags = SA_ONSTACK;
#else
        vosf_sa.sa_flags = 0;
#endif
        return (sigaction(SIGSEGV, &vosf_sa, NULL) == 0);
}
#endif


/*
 *      Update display for Windowed mode and VOSF
 */

static inline void update_display_window_vosf(void)
{
        int page = 0;
        for (;;) {
                while (PFLAG_ISCLEAR_4(page))
                        page += 4;
                
                while (PFLAG_ISCLEAR(page))
                        page++;
                
                if (page >= mainBuffer.pageCount)
                        break;
                
                const int first_page = page;
                while ((page < mainBuffer.pageCount) && PFLAG_ISSET(page)) {
                        PFLAG_CLEAR(page);
                        ++page;
                }

                // Make the dirty pages read-only again
                const int32 offset  = first_page << mainBuffer.pageBits;
                const uint32 length = (page - first_page) << mainBuffer.pageBits;
                mprotect((caddr_t)(mainBuffer.memStart + offset), length, PROT_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;
                
                const int bytes_per_row = VideoMonitor.bytes_per_row;
                const int bytes_per_pixel = VideoMonitor.bytes_per_row / VideoMonitor.x;
                int i, j;
                
                // Check for first column from left and first column
                // from right that have changed
                int x1, x2, width;
                if (depth == 1) {

                        x1 = VideoMonitor.x - 1;
                        for (j = y1; j <= y2; j++) {
                                uint8 * const p1 = &the_buffer[j * bytes_per_row];
                                uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
                                for (i = 0; i < (x1>>3); i++) {
                                        if (p1[i] != p2[i]) {
                                                x1 = i << 3;
                                                break;
                                        }
                                }
                        }

                        x2 = x1;
                        for (j = y2; j >= y1; j--) {
                                uint8 * const p1 = &the_buffer[j * bytes_per_row];
                                uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
                                for (i = (VideoMonitor.x>>3) - 1; i > (x2>>3); i--) {
                                        if (p1[i] != p2[i]) {
                                                x2 = (i << 3) + 7;
                                                break;
                                        }
                                }
                        }
                        width = x2 - x1 + 1;

                        // Update the_host_buffer and copy of the_buffer
                        i = y1 * bytes_per_row + (x1 >> 3);
                        for (j = y1; j <= y2; j++) {
                                do_update_framebuffer(the_host_buffer + i, the_buffer + i, width >> 3);
                                memcpy(the_buffer_copy + i, the_buffer + i, width >> 3);
                                i += bytes_per_row;
                        }

                } else {

                        x1 = VideoMonitor.x * bytes_per_pixel - 1;
                        for (j = y1; j <= y2; j++) {
                                uint8 * const p1 = &the_buffer[j * bytes_per_row];
                                uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
                                for (i = 0; i < x1; i++) {
                                        if (p1[i] != p2[i]) {
                                                x1 = i;
                                                break;
                                        }
                                }
                        }
                        x1 /= bytes_per_pixel;
                
                        x2 = x1 * bytes_per_pixel;
                        for (j = y2; j >= y1; j--) {
                                uint8 * const p1 = &the_buffer[j * bytes_per_row];
                                uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
                                for (i = VideoMonitor.x * bytes_per_pixel - 1; i > x2; i--) {
                                        if (p1[i] != p2[i]) {
                                                x2 = i;
                                                break;
                                        }
                                }
                        }
                        x2 /= bytes_per_pixel;
                        width = x2 - x1 + 1;

                        // Update the_host_buffer and copy of the_buffer
                        i = y1 * bytes_per_row + x1 * bytes_per_pixel;
                        for (j = y1; j <= y2; j++) {
                                do_update_framebuffer(the_host_buffer + i, the_buffer + i, bytes_per_pixel * width);
                                memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * width);
                                i += bytes_per_row;
                        }
                }
                
                if (have_shm)
                        XShmPutImage(x_display, the_win, the_gc, img, x1, y1, x1, y1, width, height, 0);
                else
                        XPutImage(x_display, the_win, the_gc, img, x1, y1, x1, y1, width, height);
        }
}


/*
 *      Update display for DGA mode and VOSF
 *      (only in Direct Addressing mode)
 */

#if REAL_ADDRESSING || DIRECT_ADDRESSING
static inline void update_display_dga_vosf(void)
{
        int page = 0;
        for (;;) {
                while (PFLAG_ISCLEAR_4(page))
                        page += 4;
                
                while (PFLAG_ISCLEAR(page))
                        page++;
                
                if (page >= mainBuffer.pageCount)
                        break;
                
                const int first_page = page;
                while ((page < mainBuffer.pageCount) && PFLAG_ISSET(page)) {
                        PFLAG_CLEAR(page);
                        ++page;
                }
                
                // Make the dirty pages read-only again
                const int32 offset  = first_page << mainBuffer.pageBits;
                const uint32 length = (page - first_page) << mainBuffer.pageBits;
                mprotect((caddr_t)(mainBuffer.memStart + offset), length, PROT_READ);
                
                // I am sure that y2 >= y1 and depth != 1
                const int y1 = mainBuffer.pageInfo[first_page].top;
                const int y2 = mainBuffer.pageInfo[page - 1].bottom;
                
                const int bytes_per_row = VideoMonitor.bytes_per_row;
                const int bytes_per_pixel = VideoMonitor.bytes_per_row / VideoMonitor.x;
                int i, j;
                
                // Check for first column from left and first column
                // from right that have changed
                int x1 = VideoMonitor.x * bytes_per_pixel - 1;
                for (j = y1; j <= y2; j++) {
                        uint8 * const p1 = &the_buffer[j * bytes_per_row];
                        uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
                        for (i = 0; i < x1; i++) {
                                if (p1[i] != p2[i]) {
                                        x1 = i;
                                        break;
                                }
                        }
                }
                x1 /= bytes_per_pixel;
                
                int x2 = x1 * bytes_per_pixel;
                for (j = y2; j >= y1; j--) {
                        uint8 * const p1 = &the_buffer[j * bytes_per_row];
                        uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
                        for (i = VideoMonitor.x * bytes_per_pixel - 1; i > x2; i--) {
                                if (p1[i] != p2[i]) {
                                        x2 = i;
                                        break;
                                }
                        }
                }
                x2 /= bytes_per_pixel;
                
                // Update the_host_buffer and copy of the_buffer
                // There should be at least one pixel to copy
                const int width = x2 - x1 + 1;
                i = y1 * bytes_per_row + x1 * bytes_per_pixel;
                for (j = y1; j <= y2; j++) {
                        do_update_framebuffer(the_host_buffer + i, the_buffer + i, bytes_per_pixel * width);
                        memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * width);
                        i += bytes_per_row;
                }
        }
}
#endif

#endif /* ENABLE_VOSF */

#endif /* VIDEO_VOSF_H */
Revision:	1.7
Committed:	2000-10-13T16:47:52Z (24 years, 1 month ago) by cebix
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+7 -2 lines
Log Message:	- replaced floating-point page shift calculation by integer routine, fixing the VOSF problems under NetBSD/m68k - fixed off-by-7 error in 1-bit window update routines
#	Content
1	/*
2	* video_vosf.h - Video/graphics emulation, video on SEGV signals support
3	*
4	* Basilisk II (C) 1997-2000 Christian Bauer
5	*
6	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19	*/
20
21	#ifndef VIDEO_VOSF_H
22	#define VIDEO_VOSF_H
23
24	// Note: this file is #include'd in video_x.cpp
25	#ifdef ENABLE_VOSF
26
27	/*
28	* Page-aligned memory allocation
29	*/
30
31	// Align on page boundaries
32	static uintptr align_on_page_boundary(uintptr size)
33	{
34	const uint32 page_size = getpagesize();
35	const uint32 page_mask = page_size - 1;
36	return (size + page_mask) & ~page_mask;
37	}
38
39	// Allocate memory on page boundary
40	static void * allocate_framebuffer(uint32 size, uint8 * hint = 0)
41	{
42	// Remind that the system can allocate at 0x00000000...
43	return mmap((caddr_t)hint, size, PROT_READ \| PROT_WRITE, MAP_PRIVATE, zero_fd, 0);
44	}
45
46
47	/*
48	* Screen depth identification
49	*/
50
51	enum {
52	ID_DEPTH_UNKNOWN = -1,
53	ID_DEPTH_1,
54	ID_DEPTH_8,
55	ID_DEPTH_15,
56	ID_DEPTH_16,
57	ID_DEPTH_24,
58	ID_DEPTH_32 = ID_DEPTH_24,
59	ID_DEPTH_COUNT
60	};
61
62	static int depth_id(int depth)
63	{
64	int id;
65	switch (depth) {
66	case 1 : id = ID_DEPTH_1; break;
67	case 8 : id = ID_DEPTH_8; break;
68	case 15 : id = ID_DEPTH_15; break;
69	case 16 : id = ID_DEPTH_16; break;
70	case 24 : id = ID_DEPTH_24; break;
71	case 32 : id = ID_DEPTH_32; break;
72	default : id = ID_DEPTH_UNKNOWN;
73	}
74	return id;
75	}
76
77
78	/*
79	* Frame buffer copy function templates
80	*/
81
82	// No conversion required
83
84	#define MEMCPY_PROFITABLE
85	#ifdef MEMCPY_PROFITABLE
86	static void do_fbcopy_raw(uint8 * dest, const uint8 * source, uint32 length)
87	{
88	memcpy(dest, source, length);
89	}
90	#else
91	#define FB_BLIT_1(dst, src) (dst = (src))
92	#define FB_BLIT_2(dst, src) (dst = (src))
93	#define FB_DEPTH 0
94	#define FB_FUNC_NAME do_fbcopy_raw
95	#include "video_blit.h"
96	#endif
97
98
99	// RGB 555
100
101	#ifdef WORDS_BIGENDIAN
102	# define FB_FUNC_NAME do_fbcopy_15_obo
103	#else
104	# define FB_FUNC_NAME do_fbcopy_15_nbo
105	#endif
106
107	#define FB_BLIT_1(dst, src) \
108	(dst = (((src) >> 8) & 0xff) \| (((src) & 0xff) << 8))
109
110	#define FB_BLIT_2(dst, src) \
111	(dst = (((src) >> 8) & 0x00ff00ff) \| (((src) & 0x00ff00ff) << 8))
112
113	#define FB_DEPTH 15
114	#include "video_blit.h"
115
116
117	// RGB 565
118
119	#ifdef WORDS_BIGENDIAN
120
121	// native byte order
122
123	#define FB_BLIT_1(dst, src) \
124	(dst = (((src) & 0x1f) \| (((src) << 1) & 0xffc0)))
125
126	#define FB_BLIT_2(dst, src) \
127	(dst = (((src) & 0x001f001f) \| (((src) << 1) & 0xffc0ffc0)))
128
129	#define FB_DEPTH 16
130	#define FB_FUNC_NAME do_fbcopy_16_nbo
131	#include "video_blit.h"
132
133	// opposite byte order (untested)
134
135	#define FB_BLIT_1(dst, src) \
136	(dst = ((((src) >> 6) & 0xff) \| (((src) & 0x60) << 9)))
137
138	#define FB_BLIT_2(dst, src) \
139	(dst = ((((src) >> 6) & 0x00ff00ff) \| (((src) & 0x00600060) << 9)))
140
141	#define FB_DEPTH 16
142	#define FB_FUNC_NAME do_fbcopy_16_obo
143	#include "video_blit.h"
144
145	#else
146
147	// native byte order
148
149	#define FB_BLIT_1(dst, src) \
150	(dst = (((src) >> 8) & 0x001f) \| (((src) << 9) & 0xfe00) \| (((src) >> 7) & 0x01c0))
151
152	#define FB_BLIT_2(dst, src) \
153	(dst = (((src) >> 8) & 0x001f001f) \| (((src) << 9) & 0xfe00fe00) \| (((src) >> 7) & 0x01c001c0))
154
155	#define FB_DEPTH 16
156	#define FB_FUNC_NAME do_fbcopy_16_nbo
157	#include "video_blit.h"
158
159	// opposite byte order (untested)
160
161	#define FB_BLIT_1(dst, src) \
162	(dst = (((src) & 0x1f00) \| (((src) << 1) & 0xe0fe) \| (((src) >> 15) & 1)))
163
164	#define FB_BLIT_2(dst, src) \
165	(dst = (((src) & 0x1f001f00) \| (((src) << 1) & 0xe0fee0fe) \| (((src) >> 15) & 0x10001)))
166
167	#define FB_DEPTH 16
168	#define FB_FUNC_NAME do_fbcopy_16_obo
169	#include "video_blit.h"
170
171	#endif
172
173	// RGB 888
174
175	#ifdef WORDS_BIGENDIAN
176	# define FB_FUNC_NAME do_fbcopy_24_obo
177	#else
178	# define FB_FUNC_NAME do_fbcopy_24_nbo
179	#endif
180
181	#define FB_BLIT_1(dst, src) \
182	(dst = (src))
183
184	#define FB_BLIT_2(dst, src) \
185	(dst = (((src) >> 24) & 0xff) \| (((src) >> 8) & 0xff00) \| (((src) & 0xff00) << 8) \| (((src) & 0xff) << 24))
186
187	#define FB_DEPTH 24
188	#include "video_blit.h"
189
190
191	/*
192	* Frame buffer copy functions map table
193	*/
194
195	typedef void (fbcopy_func)(uint8 , const uint8 *, uint32);
196	static fbcopy_func do_update_framebuffer;
197
198	#define FBCOPY_FUNC(aHandler) do_ ## aHandler
199
200	#if REAL_ADDRESSING \|\| DIRECT_ADDRESSING
201	#define WD(X) { FBCOPY_FUNC(X), FBCOPY_FUNC(X) }
202	#else
203	#define WD(X) { FBCOPY_FUNC(fbcopy_raw), FBCOPY_FUNC(fbcopy_raw) }
204	#endif
205
206	// fb_copy_funcs[depth_id][native_byte_order][dga_mode]
207	// NT : not tested
208	// OK : has been successfully tested
209	// NBO : native byte order
210	// OBO : opposite byte order
211	static fbcopy_func fbcopy_funcs[ID_DEPTH_COUNT][2][2] = {
212	#ifdef WORDS_BIGENDIAN
213	/* opposite byte order native byte order */
214	/* 1 bpp */ { WD(fbcopy_raw) , WD(fbcopy_raw) }, // NT
215	/* 8 bpp */ { WD(fbcopy_raw) , WD(fbcopy_raw) }, // OK (NBO)
216	/* 15 bpp */ { WD(fbcopy_15_obo) , WD(fbcopy_raw) }, // NT
217	/* 16 bpp */ { WD(fbcopy_16_obo) , WD(fbcopy_16_nbo) }, // NT
218	/* 24 bpp */ { WD(fbcopy_24_obo) , WD(fbcopy_raw) } // NT
219	#else
220	/* opposite byte order native byte order */
221	/* 1 bpp */ { WD(fbcopy_raw) , WD(fbcopy_raw) }, // NT
222	/* 8 bpp */ { WD(fbcopy_raw) , WD(fbcopy_raw) }, // OK (NBO)
223	/* 15 bpp */ { WD(fbcopy_raw) , WD(fbcopy_15_nbo) }, // OK (NBO)
224	/* 16 bpp */ { WD(fbcopy_16_obo) , WD(fbcopy_16_nbo) }, // OK (NBO)
225	/* 24 bpp */ { WD(fbcopy_raw) , WD(fbcopy_24_nbo) } // NT
226	#endif
227	};
228
229	#undef WD
230
231	#define FBCOPY_FUNC_ERROR \
232	ErrorAlert("Invalid screen depth")
233
234	#define GET_FBCOPY_FUNC(aDepth, aNativeByteOrder, aDisplay) \
235	((depth_id(aDepth) == ID_DEPTH_UNKNOWN) ? ( FBCOPY_FUNC_ERROR, (fbcopy_func)0 ) : \
236	fbcopy_funcs[depth_id(aDepth)][(aNativeByteOrder)][(aDisplay) == DISPLAY_DGA ? 1 : 0])
237
238
239	/*
240	* Screen fault handler
241	*/
242
243	static inline void do_handle_screen_fault(uintptr addr)
244	{
245	if ((addr < mainBuffer.memStart) \|\| (addr >= mainBuffer.memEnd)) {
246	fprintf(stderr, "Segmentation fault at 0x%08X\n", addr);
247	abort();
248	}
249
250	const int page = (addr - mainBuffer.memStart) >> mainBuffer.pageBits;
251	caddr_t page_ad = (caddr_t)(addr & ~(mainBuffer.pageSize - 1));
252	#ifdef HAVE_PTHREADS
253	pthread_mutex_lock(&Screen_draw_lock);
254	#endif
255	PFLAG_SET(page);
256	mprotect(page_ad, mainBuffer.pageSize, PROT_READ \| PROT_WRITE);
257	#ifdef HAVE_PTHREADS
258	pthread_mutex_unlock(&Screen_draw_lock);
259	#endif
260	}
261
262	#if defined(HAVE_SIGINFO_T)
263
264	static void Screen_fault_handler(int, siginfo_t * sip, void *)
265	{
266	D(bug("Screen_fault_handler: ADDR=0x%08X\n", sip->si_addr));
267	do_handle_screen_fault((uintptr)sip->si_addr);
268	}
269
270	#elif defined(HAVE_SIGCONTEXT_SUBTERFUGE)
271
272	# if defined(__i386__) && defined(__linux__)
273	static void Screen_fault_handler(int, struct sigcontext scs)
274	{
275	D(bug("Screen_fault_handler: ADDR=0x%08X from IP=0x%08X\n", scs.cr2, scs.eip));
276	do_handle_screen_fault((uintptr)scs.cr2);
277	}
278
279	# elif defined(__m68k__) && defined(__NetBSD__)
280
281	# include <m68k/frame.h>
282	static void Screen_fault_handler(int, int code, struct sigcontext *scp)
283	{
284	D(bug("Screen_fault_handler: ADDR=0x%08X\n", code));
285	struct sigstate {
286	int ss_flags;
287	struct frame ss_frame;
288	};
289	struct sigstate state = (struct sigstate )scp->sc_ap;
290	uintptr fault_addr;
291	switch (state->ss_frame.f_format) {
292	case 7: // 68040 access error
293	// "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown
294	fault_addr = state->ss_frame.f_fmt7.f_fa;
295	break;
296	default:
297	fault_addr = (uintptr)code;
298	break;
299	}
300	do_handle_screen_fault(fault_addr);
301	}
302
303	# else
304	# error "No suitable subterfuge for Video on SEGV signals"
305	# endif
306	#else
307	# error "Can't do Video on SEGV signals"
308	#endif
309
310
311	/*
312	* Screen fault handler initialization
313	*/
314
315	#if defined(HAVE_SIGINFO_T)
316	static bool Screen_fault_handler_init()
317	{
318	// Setup SIGSEGV handler to process writes to frame buffer
319	sigemptyset(&vosf_sa.sa_mask);
320	vosf_sa.sa_sigaction = Screen_fault_handler;
321	vosf_sa.sa_flags = SA_SIGINFO;
322	return (sigaction(SIGSEGV, &vosf_sa, NULL) == 0);
323	}
324	#elif defined(HAVE_SIGCONTEXT_SUBTERFUGE)
325	static bool Screen_fault_handler_init()
326	{
327	// Setup SIGSEGV handler to process writes to frame buffer
328	sigemptyset(&vosf_sa.sa_mask);
329	vosf_sa.sa_handler = (void (*)(int)) Screen_fault_handler;
330	#if !EMULATED_68K && defined(__NetBSD__)
331	sigaddset(&vosf_sa.sa_mask, SIGALRM);
332	vosf_sa.sa_flags = SA_ONSTACK;
333	#else
334	vosf_sa.sa_flags = 0;
335	#endif
336	return (sigaction(SIGSEGV, &vosf_sa, NULL) == 0);
337	}
338	#endif
339
340
341	/*
342	* Update display for Windowed mode and VOSF
343	*/
344
345	static inline void update_display_window_vosf(void)
346	{
347	int page = 0;
348	for (;;) {
349	while (PFLAG_ISCLEAR_4(page))
350	page += 4;
351
352	while (PFLAG_ISCLEAR(page))
353	page++;
354
355	if (page >= mainBuffer.pageCount)
356	break;
357
358	const int first_page = page;
359	while ((page < mainBuffer.pageCount) && PFLAG_ISSET(page)) {
360	PFLAG_CLEAR(page);
361	++page;
362	}
363
364	// Make the dirty pages read-only again
365	const int32 offset = first_page << mainBuffer.pageBits;
366	const uint32 length = (page - first_page) << mainBuffer.pageBits;
367	mprotect((caddr_t)(mainBuffer.memStart + offset), length, PROT_READ);
368
369	// There is at least one line to update
370	const int y1 = mainBuffer.pageInfo[first_page].top;
371	const int y2 = mainBuffer.pageInfo[page - 1].bottom;
372	const int height = y2 - y1 + 1;
373
374	const int bytes_per_row = VideoMonitor.bytes_per_row;
375	const int bytes_per_pixel = VideoMonitor.bytes_per_row / VideoMonitor.x;
376	int i, j;
377
378	// Check for first column from left and first column
379	// from right that have changed
380	int x1, x2, width;
381	if (depth == 1) {
382
383	x1 = VideoMonitor.x - 1;
384	for (j = y1; j <= y2; j++) {
385	uint8 * const p1 = &the_buffer[j * bytes_per_row];
386	uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
387	for (i = 0; i < (x1>>3); i++) {
388	if (p1[i] != p2[i]) {
389	x1 = i << 3;
390	break;
391	}
392	}
393	}
394
395	x2 = x1;
396	for (j = y2; j >= y1; j--) {
397	uint8 * const p1 = &the_buffer[j * bytes_per_row];
398	uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
399	for (i = (VideoMonitor.x>>3) - 1; i > (x2>>3); i--) {
400	if (p1[i] != p2[i]) {
401	x2 = (i << 3) + 7;
402	break;
403	}
404	}
405	}
406	width = x2 - x1 + 1;
407
408	// Update the_host_buffer and copy of the_buffer
409	i = y1 * bytes_per_row + (x1 >> 3);
410	for (j = y1; j <= y2; j++) {
411	do_update_framebuffer(the_host_buffer + i, the_buffer + i, width >> 3);
412	memcpy(the_buffer_copy + i, the_buffer + i, width >> 3);
413	i += bytes_per_row;
414	}
415
416	} else {
417
418	x1 = VideoMonitor.x * bytes_per_pixel - 1;
419	for (j = y1; j <= y2; j++) {
420	uint8 * const p1 = &the_buffer[j * bytes_per_row];
421	uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
422	for (i = 0; i < x1; i++) {
423	if (p1[i] != p2[i]) {
424	x1 = i;
425	break;
426	}
427	}
428	}
429	x1 /= bytes_per_pixel;
430
431	x2 = x1 * bytes_per_pixel;
432	for (j = y2; j >= y1; j--) {
433	uint8 * const p1 = &the_buffer[j * bytes_per_row];
434	uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
435	for (i = VideoMonitor.x * bytes_per_pixel - 1; i > x2; i--) {
436	if (p1[i] != p2[i]) {
437	x2 = i;
438	break;
439	}
440	}
441	}
442	x2 /= bytes_per_pixel;
443	width = x2 - x1 + 1;
444
445	// Update the_host_buffer and copy of the_buffer
446	i = y1 * bytes_per_row + x1 * bytes_per_pixel;
447	for (j = y1; j <= y2; j++) {
448	do_update_framebuffer(the_host_buffer + i, the_buffer + i, bytes_per_pixel * width);
449	memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * width);
450	i += bytes_per_row;
451	}
452	}
453
454	if (have_shm)
455	XShmPutImage(x_display, the_win, the_gc, img, x1, y1, x1, y1, width, height, 0);
456	else
457	XPutImage(x_display, the_win, the_gc, img, x1, y1, x1, y1, width, height);
458	}
459	}
460
461
462	/*
463	* Update display for DGA mode and VOSF
464	* (only in Direct Addressing mode)
465	*/
466
467	#if REAL_ADDRESSING \|\| DIRECT_ADDRESSING
468	static inline void update_display_dga_vosf(void)
469	{
470	int page = 0;
471	for (;;) {
472	while (PFLAG_ISCLEAR_4(page))
473	page += 4;
474
475	while (PFLAG_ISCLEAR(page))
476	page++;
477
478	if (page >= mainBuffer.pageCount)
479	break;
480
481	const int first_page = page;
482	while ((page < mainBuffer.pageCount) && PFLAG_ISSET(page)) {
483	PFLAG_CLEAR(page);
484	++page;
485	}
486
487	// Make the dirty pages read-only again
488	const int32 offset = first_page << mainBuffer.pageBits;
489	const uint32 length = (page - first_page) << mainBuffer.pageBits;
490	mprotect((caddr_t)(mainBuffer.memStart + offset), length, PROT_READ);
491
492	// I am sure that y2 >= y1 and depth != 1
493	const int y1 = mainBuffer.pageInfo[first_page].top;
494	const int y2 = mainBuffer.pageInfo[page - 1].bottom;
495
496	const int bytes_per_row = VideoMonitor.bytes_per_row;
497	const int bytes_per_pixel = VideoMonitor.bytes_per_row / VideoMonitor.x;
498	int i, j;
499
500	// Check for first column from left and first column
501	// from right that have changed
502	int x1 = VideoMonitor.x * bytes_per_pixel - 1;
503	for (j = y1; j <= y2; j++) {
504	uint8 * const p1 = &the_buffer[j * bytes_per_row];
505	uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
506	for (i = 0; i < x1; i++) {
507	if (p1[i] != p2[i]) {
508	x1 = i;
509	break;
510	}
511	}
512	}
513	x1 /= bytes_per_pixel;
514
515	int x2 = x1 * bytes_per_pixel;
516	for (j = y2; j >= y1; j--) {
517	uint8 * const p1 = &the_buffer[j * bytes_per_row];
518	uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
519	for (i = VideoMonitor.x * bytes_per_pixel - 1; i > x2; i--) {
520	if (p1[i] != p2[i]) {
521	x2 = i;
522	break;
523	}
524	}
525	}
526	x2 /= bytes_per_pixel;
527
528	// Update the_host_buffer and copy of the_buffer
529	// There should be at least one pixel to copy
530	const int width = x2 - x1 + 1;
531	i = y1 * bytes_per_row + x1 * bytes_per_pixel;
532	for (j = y1; j <= y2; j++) {
533	do_update_framebuffer(the_host_buffer + i, the_buffer + i, bytes_per_pixel * width);
534	memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * width);
535	i += bytes_per_row;
536	}
537	}
538	}
539	#endif
540
541	#endif /* ENABLE_VOSF */
542
543	#endif /* VIDEO_VOSF_H */