src/Unix/video_blit.cpp

/*
 *  video_blit.cpp - Video/graphics emulation, blitters
 *
 *  Basilisk II (C) 1997-2001 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
 */

#include "sysdeps.h"
#include "video.h"

#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

#ifdef ENABLE_VOSF
// Format of the target visual
struct VisualFormat {
        int             depth;                                  // Screen depth
        uint32  Rmask, Gmask, Bmask;    // RGB mask values
        uint32  Rshift, Gshift, Bshift; // RGB shift values
};
static VisualFormat visualFormat;

// This holds the pixels values of the palette colors for 8->16/32-bit expansion
uint32 ExpandMap[256];

/* -------------------------------------------------------------------------- */
/* --- Raw Copy / No conversion required                                  --- */
/* -------------------------------------------------------------------------- */

static void Blit_Copy_Raw(uint8 * dest, const uint8 * source, uint32 length)
{
        // This function is likely to be inlined and/or highly optimized
        memcpy(dest, source, length);
}

/* -------------------------------------------------------------------------- */
/* --- RGB 555                                                            --- */
/* -------------------------------------------------------------------------- */

#ifdef WORDS_BIGENDIAN
# define FB_FUNC_NAME Blit_RGB555_OBO
#else
# define FB_FUNC_NAME Blit_RGB555_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"

/* -------------------------------------------------------------------------- */
/* --- BGR 555                                                            --- */
/* -------------------------------------------------------------------------- */

#ifdef WORDS_BIGENDIAN

// Native byte order

#define FB_BLIT_1(dst, src) \
        (dst = (((src) >> 10) & 0x001f) | ((src) & 0x03e0) | (((src) << 10) & 0x7c00))

#define FB_BLIT_2(dst, src) \
        (dst = (((src) >> 10) & 0x001f001f) | ((src) & 0x03e003e0) | (((src) << 10) & 0x7c007c00))

#define FB_DEPTH 15
#define FB_FUNC_NAME Blit_BGR555_NBO
#include "video_blit.h"

// Opposite byte order (untested)

#define FB_BLIT_1(dst, src) \
        (dst = (((src) >> 2) & 0x1f00) | (((src) >> 8) & 3) | (((src) << 8) & 0xe000) | (((src) << 2) & 0x7c))

#define FB_BLIT_2(dst, src) \
        (dst = (((src) >> 2) & 0x1f001f00) | (((src) >> 8) & 0x30003) | (((src) << 8) & 0xe000e000) | (((src) << 2) & 0x7c007c))

#define FB_DEPTH 15
#define FB_FUNC_NAME Blit_BGR555_OBO
#include "video_blit.h"

#else

// Native byte order (untested)

#define FB_BLIT_1(dst, src) \
        (dst = (((src) >> 2) & 0x1f) | (((src) >> 8) & 0xe0) | (((src) << 8) & 0x0300) | (((src) << 2) & 0x7c00))

#define FB_BLIT_2(dst, src) \
        (dst = (((src) >> 2) & 0x1f001f) | (((src) >> 8) & 0xe000e0) | (((src) << 8) & 0x03000300) | (((src) << 2) & 0x7c007c00))

#define FB_DEPTH 15
#define FB_FUNC_NAME Blit_BGR555_NBO
#include "video_blit.h"

// Opposite byte order (untested)

#define FB_BLIT_1(dst, src) \
        (dst = (((src) << 6) & 0x1f00) | ((src) & 0xe003) | (((src) >> 6) & 0x7c))

#define FB_BLIT_2(dst, src) \
        (dst = (((src) << 6) & 0x1f001f00) | ((src) & 0xe003e003) | (((src) >> 6) & 0x7c007c))

#define FB_DEPTH 15
#define FB_FUNC_NAME Blit_BGR555_OBO
#include "video_blit.h"

#endif

/* -------------------------------------------------------------------------- */
/* --- 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 Blit_RGB565_NBO
#include "video_blit.h"

// Opposite byte order

#define FB_BLIT_1(dst, src) \
        (dst = ((((src) >> 7) & 0xff) | (((src) << 9) & 0xc000) | (((src) << 8) & 0x1f00)))

#define FB_BLIT_2(dst, src) \
        (dst = ((((src) >> 7) & 0x00ff00ff) | (((src) << 9) & 0xc000c000) | (((src) << 8) & 0x1f001f00)))

#define FB_DEPTH 16
#define FB_FUNC_NAME Blit_RGB565_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))
        
// gb-- Disabled because I don't see any improvement
#if 0 && defined(__i386__) && defined(X86_ASSEMBLY)

#define FB_BLIT_2(dst, src) \
        __asm__ (       "movl %0,%%ebx\n\t" \
                                "movl %0,%%ebp\n\t" \
                                "andl $0x1f001f00,%%ebx\n\t" \
                                "andl $0x007f007f,%0\n\t" \
                                "andl $0xe000e000,%%ebp\n\t" \
                                "shrl $8,%%ebx\n\t" \
                                "shrl $7,%%ebp\n\t" \
                                "shll $9,%0\n\t" \
                                "orl %%ebx,%%ebp\n\t" \
                                "orl %%ebp,%0\n\t" \
                        : "=r" (dst) : "0" (src) : "ebx", "ebp", "cc" )

#else

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

#endif

#define FB_DEPTH 16
#define FB_FUNC_NAME Blit_RGB565_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 Blit_RGB565_OBO
#include "video_blit.h"

#endif

/* -------------------------------------------------------------------------- */
/* --- RGB 888                                                            --- */
/* -------------------------------------------------------------------------- */

#ifdef WORDS_BIGENDIAN
# define FB_FUNC_NAME Blit_RGB888_OBO
#else
# define FB_FUNC_NAME Blit_RGB888_NBO
#endif

#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"

/* -------------------------------------------------------------------------- */
/* --- BGR 888                                                            --- */
/* -------------------------------------------------------------------------- */

// Native byte order [BE] (untested)

#ifdef WORDS_BIGENDIAN

#define FB_BLIT_2(dst, src) \
        (dst = (((src) >> 16) & 0xff) | ((src) & 0xff00) | (((src) & 0xff) << 16))

#define FB_FUNC_NAME Blit_BGR888_NBO
#define FB_DEPTH 24
#include "video_blit.h"

#else

// Opposite byte order [LE] (untested)

#define FB_BLIT_2(dst, src) \
        (dst = (((src) >> 16) & 0xff) | ((src) & 0xff0000) | (((src) & 0xff) << 16))

#define FB_FUNC_NAME Blit_BGR888_OBO
#define FB_DEPTH 24
#include "video_blit.h"

#endif

// Opposite byte order [BE] (untested) / Native byte order [LE] (untested)

#ifdef WORDS_BIGENDIAN
# define FB_FUNC_NAME Blit_BGR888_OBO
#else
# define FB_FUNC_NAME Blit_BGR888_NBO
#endif

#define FB_BLIT_2(dst, src) \
        (dst = ((src) & 0xff00ff) | (((src) & 0xff00) << 16))

#define FB_DEPTH 24
#include "video_blit.h"

/* -------------------------------------------------------------------------- */
/* --- 8-bit indexed to 16-bit mode color expansion                       --- */
/* -------------------------------------------------------------------------- */

static void Blit_Expand_8_To_16(uint8 * dest, const uint8 * p, uint32 length)
{
        uint16 *q = (uint16 *)dest;
        for (int i=0; i<length; i++)
                *q++ = ExpandMap[*p++];
}

/* -------------------------------------------------------------------------- */
/* --- 8-bit indexed to 32-bit mode color expansion                       --- */
/* -------------------------------------------------------------------------- */

static void Blit_Expand_8_To_32(uint8 * dest, const uint8 * p, uint32 length)
{
        uint32 *q = (uint32 *)dest;
        for (int i=0; i<length; i++)
                *q++ = ExpandMap[*p++];
}

/* -------------------------------------------------------------------------- */
/* --- Blitters to the host frame buffer, or XImage buffer                --- */
/* -------------------------------------------------------------------------- */

// Function used to update the hosst frame buffer (DGA), or an XImage buffer (WIN)
// --> Shall be initialized only through the Screen_blitter_init() function
typedef void (*Screen_blit_func)(uint8 * dest, const uint8 * source, uint32 length);
Screen_blit_func Screen_blit = 0;

// Structure used to match the adequate framebuffer update function
struct Screen_blit_func_info {
        int                                     depth;                  // Screen depth
        uint32                          Rmask;                  // Red mask
        uint32                          Gmask;                  // Green mask
        uint32                          Bmask;                  // Blue mask
        Screen_blit_func        handler_nbo;    // Update function (native byte order)
        Screen_blit_func        handler_obo;    // Update function (opposite byte order)
};

// Table of visual formats supported and their respective handler
static Screen_blit_func_info Screen_blitters[] = {
#ifdef WORDS_BIGENDIAN
        {  1, 0x000000, 0x000000, 0x000000, Blit_Copy_Raw       , Blit_Copy_Raw         },      // NT
        {  8, 0x000000, 0x000000, 0x000000, Blit_Copy_Raw       , Blit_Copy_Raw         },      // OK (NBO)
        { 15, 0x007c00, 0x0003e0, 0x00001f, Blit_Copy_Raw       , Blit_RGB555_OBO       },      // OK (OBO)
        { 15, 0x00001f, 0x0003e0, 0x007c00, Blit_BGR555_NBO     , Blit_BGR555_OBO       },      // NT
        { 16, 0x00f800, 0x0007e0, 0x00001f, Blit_RGB565_NBO     , Blit_RGB565_OBO       },      // OK (OBO)
        { 24, 0xff0000, 0x00ff00, 0x0000ff, Blit_Copy_Raw       , Blit_RGB888_OBO       },      // OK (OBO)
        { 24, 0x0000ff, 0x00ff00, 0xff0000, Blit_BGR888_NBO     , Blit_BGR888_OBO       },      // NT
        { 32, 0xff0000, 0x00ff00, 0x0000ff, Blit_Copy_Raw       , Blit_RGB888_OBO       },      // OK
        { 32, 0x0000ff, 0x00ff00, 0xff0000, Blit_BGR888_NBO     , Blit_BGR888_OBO       }       // OK
#else
        {  1, 0x000000, 0x000000, 0x000000, Blit_Copy_Raw       , Blit_Copy_Raw         },      // NT
        {  8, 0x000000, 0x000000, 0x000000, Blit_Copy_Raw       , Blit_Copy_Raw         },      // OK (NBO)
        { 15, 0x007c00, 0x0003e0, 0x00001f, Blit_RGB555_NBO     , Blit_Copy_Raw         },      // OK (NBO)
        { 15, 0x00001f, 0x0003e0, 0x007c00, Blit_BGR555_NBO     , Blit_BGR555_OBO       },      // NT
        { 16, 0x00f800, 0x0007e0, 0x00001f, Blit_RGB565_NBO     , Blit_RGB565_OBO       },      // OK (NBO)
        { 24, 0xff0000, 0x00ff00, 0x0000ff, Blit_RGB888_NBO     , Blit_Copy_Raw         },      // OK (NBO)
        { 24, 0x0000ff, 0x00ff00, 0xff0000, Blit_BGR888_NBO     , Blit_BGR888_OBO       },      // NT
        { 32, 0xff0000, 0x00ff00, 0x0000ff, Blit_RGB888_NBO     , Blit_Copy_Raw         },      // OK (NBO)
        { 32, 0x0000ff, 0x00ff00, 0xff0000, Blit_BGR888_NBO     , Blit_BGR888_OBO       }       // NT
#endif
};

// Initialize the framebuffer update function
// Returns FALSE, if the function was to be reduced to a simple memcpy()
// --> In that case, VOSF is not necessary
bool Screen_blitter_init(XVisualInfo * visual_info, bool native_byte_order, video_depth mac_depth)
{
#if REAL_ADDRESSING || DIRECT_ADDRESSING
        if (mac_depth == VDEPTH_1BIT) {

                // 1-bit mode uses a 1-bit X image, so there's no need for special blitting routines
                Screen_blit = Blit_Copy_Raw;

        } else {

                visualFormat.depth = visual_info->depth;
                visualFormat.Rmask = visual_info->red_mask;
                visualFormat.Gmask = visual_info->green_mask;
                visualFormat.Bmask = visual_info->blue_mask;

                // Compute RGB shift values
                visualFormat.Rshift = 0;
                for (uint32 Rmask = visualFormat.Rmask; Rmask && ((Rmask & 1) != 1); Rmask >>= 1)
                        ++visualFormat.Rshift;
                visualFormat.Gshift = 0;
                for (uint32 Gmask = visualFormat.Gmask; Gmask && ((Gmask & 1) != 1); Gmask >>= 1)
                        ++visualFormat.Gshift;
                visualFormat.Bshift = 0;
                for (uint32 Bmask = visualFormat.Bmask; Bmask && ((Bmask & 1) != 1); Bmask >>= 1)
                        ++visualFormat.Bshift;

                bool blitter_found = false;
        
                // 8-bit mode on 16/32-bit screen?
                if (mac_depth == VDEPTH_8BIT && visualFormat.depth > 8) {
                        if (visual_info->depth <= 16) {
                                Screen_blit = Blit_Expand_8_To_16;
                                blitter_found = true;
                        } else {
                                Screen_blit = Blit_Expand_8_To_32;
                                blitter_found = true;
                        }
                }
        
                // Search for an adequate blit function
                const int blitters_count = sizeof(Screen_blitters)/sizeof(Screen_blitters[0]);
                for (int i = 0; !blitter_found && (i < blitters_count); i++) {
                        if      (       (visualFormat.depth == Screen_blitters[i].depth)
                                &&      (visualFormat.Rmask == Screen_blitters[i].Rmask)
                                &&      (visualFormat.Gmask == Screen_blitters[i].Gmask)
                                &&      (visualFormat.Bmask == Screen_blitters[i].Bmask)
                                )
                        {
                                blitter_found = true;
                                Screen_blit = native_byte_order
                                                        ? Screen_blitters[i].handler_nbo
                                                        : Screen_blitters[i].handler_obo
                                                        ;
                        }
                }
        
                // No appropriate blitter found, dump RGB mask values and abort()
                if (!blitter_found) {
                        fprintf(stderr, "### No appropriate blitter found\n");
                        fprintf(stderr, "\tR/G/B mask values  : 0x%06x, 0x%06x, 0x%06x (depth = %d)\n",
                                visualFormat.Rmask, visualFormat.Gmask, visualFormat.Bmask, visualFormat.depth);
                        fprintf(stderr, "\tR/G/B shift values : %d/%d/%d\n",
                                visualFormat.Rshift, visualFormat.Gshift, visualFormat.Bshift);
                        abort();
                }
        }
#else
        // The UAE memory handlers will blit correctly
        // --> no need for specialised blitters here
        Screen_blit = Blit_Copy_Raw;
#endif
        
        // If the blitter simply reduces to a copy, we don't need VOSF in DGA mode
        // --> In that case, we return FALSE
        return (Screen_blit != Blit_Copy_Raw);
}
#endif /* ENABLE_VOSF */
Revision:	1.5
Committed:	2001-07-01T19:57:55Z (23 years ago) by cebix
Branch:	MAIN
Changes since 1.4:	+39 -2 lines
Log Message:	added support for 8-bit windowed modes on 16 and 32-bit screens (for the games, man, the games! :-)
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* video_blit.cpp - Video/graphics emulation, blitters
3			*
4			* Basilisk II (C) 1997-2001 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			#include "sysdeps.h"
22	cebix	1.4	#include "video.h"
23	gbeauche	1.1
24			#include <stdio.h>
25			#include <stdlib.h>
26			#include <X11/Xlib.h>
27			#include <X11/Xutil.h>
28
29			#ifdef ENABLE_VOSF
30			// Format of the target visual
31			struct VisualFormat {
32			int depth; // Screen depth
33			uint32 Rmask, Gmask, Bmask; // RGB mask values
34			uint32 Rshift, Gshift, Bshift; // RGB shift values
35			};
36			static VisualFormat visualFormat;
37
38	cebix	1.5	// This holds the pixels values of the palette colors for 8->16/32-bit expansion
39			uint32 ExpandMap[256];
40
41	gbeauche	1.1	/* -------------------------------------------------------------------------- */
42			/* --- Raw Copy / No conversion required --- */
43			/* -------------------------------------------------------------------------- */
44
45			static void Blit_Copy_Raw(uint8 * dest, const uint8 * source, uint32 length)
46			{
47			// This function is likely to be inlined and/or highly optimized
48			memcpy(dest, source, length);
49			}
50
51			/* -------------------------------------------------------------------------- */
52			/* --- RGB 555 --- */
53			/* -------------------------------------------------------------------------- */
54
55			#ifdef WORDS_BIGENDIAN
56			# define FB_FUNC_NAME Blit_RGB555_OBO
57			#else
58			# define FB_FUNC_NAME Blit_RGB555_NBO
59			#endif
60
61			#define FB_BLIT_1(dst, src) \
62			(dst = (((src) >> 8) & 0xff) \| (((src) & 0xff) << 8))
63
64			#define FB_BLIT_2(dst, src) \
65			(dst = (((src) >> 8) & 0x00ff00ff) \| (((src) & 0x00ff00ff) << 8))
66
67			#define FB_DEPTH 15
68			#include "video_blit.h"
69
70			/* -------------------------------------------------------------------------- */
71			/* --- BGR 555 --- */
72			/* -------------------------------------------------------------------------- */
73
74	gbeauche	1.2	#ifdef WORDS_BIGENDIAN
75
76			// Native byte order
77
78			#define FB_BLIT_1(dst, src) \
79			(dst = (((src) >> 10) & 0x001f) \| ((src) & 0x03e0) \| (((src) << 10) & 0x7c00))
80
81			#define FB_BLIT_2(dst, src) \
82			(dst = (((src) >> 10) & 0x001f001f) \| ((src) & 0x03e003e0) \| (((src) << 10) & 0x7c007c00))
83
84			#define FB_DEPTH 15
85			#define FB_FUNC_NAME Blit_BGR555_NBO
86			#include "video_blit.h"
87
88			// Opposite byte order (untested)
89
90			#define FB_BLIT_1(dst, src) \
91			(dst = (((src) >> 2) & 0x1f00) \| (((src) >> 8) & 3) \| (((src) << 8) & 0xe000) \| (((src) << 2) & 0x7c))
92
93			#define FB_BLIT_2(dst, src) \
94			(dst = (((src) >> 2) & 0x1f001f00) \| (((src) >> 8) & 0x30003) \| (((src) << 8) & 0xe000e000) \| (((src) << 2) & 0x7c007c))
95
96			#define FB_DEPTH 15
97			#define FB_FUNC_NAME Blit_BGR555_OBO
98			#include "video_blit.h"
99
100			#else
101
102			// Native byte order (untested)
103
104			#define FB_BLIT_1(dst, src) \
105			(dst = (((src) >> 2) & 0x1f) \| (((src) >> 8) & 0xe0) \| (((src) << 8) & 0x0300) \| (((src) << 2) & 0x7c00))
106
107			#define FB_BLIT_2(dst, src) \
108			(dst = (((src) >> 2) & 0x1f001f) \| (((src) >> 8) & 0xe000e0) \| (((src) << 8) & 0x03000300) \| (((src) << 2) & 0x7c007c00))
109
110			#define FB_DEPTH 15
111			#define FB_FUNC_NAME Blit_BGR555_NBO
112			#include "video_blit.h"
113
114			// Opposite byte order (untested)
115
116			#define FB_BLIT_1(dst, src) \
117			(dst = (((src) << 6) & 0x1f00) \| ((src) & 0xe003) \| (((src) >> 6) & 0x7c))
118
119			#define FB_BLIT_2(dst, src) \
120			(dst = (((src) << 6) & 0x1f001f00) \| ((src) & 0xe003e003) \| (((src) >> 6) & 0x7c007c))
121
122			#define FB_DEPTH 15
123			#define FB_FUNC_NAME Blit_BGR555_OBO
124			#include "video_blit.h"
125
126			#endif
127	gbeauche	1.1
128			/* -------------------------------------------------------------------------- */
129			/* --- RGB 565 --- */
130			/* -------------------------------------------------------------------------- */
131
132			#ifdef WORDS_BIGENDIAN
133
134			// Native byte order
135
136			#define FB_BLIT_1(dst, src) \
137			(dst = (((src) & 0x1f) \| (((src) << 1) & 0xffc0)))
138
139			#define FB_BLIT_2(dst, src) \
140			(dst = (((src) & 0x001f001f) \| (((src) << 1) & 0xffc0ffc0)))
141
142			#define FB_DEPTH 16
143			#define FB_FUNC_NAME Blit_RGB565_NBO
144			#include "video_blit.h"
145
146			// Opposite byte order
147
148			#define FB_BLIT_1(dst, src) \
149			(dst = ((((src) >> 7) & 0xff) \| (((src) << 9) & 0xc000) \| (((src) << 8) & 0x1f00)))
150
151			#define FB_BLIT_2(dst, src) \
152			(dst = ((((src) >> 7) & 0x00ff00ff) \| (((src) << 9) & 0xc000c000) \| (((src) << 8) & 0x1f001f00)))
153
154			#define FB_DEPTH 16
155			#define FB_FUNC_NAME Blit_RGB565_OBO
156			#include "video_blit.h"
157
158			#else
159
160			// Native byte order
161
162			#define FB_BLIT_1(dst, src) \
163			(dst = (((src) >> 8) & 0x001f) \| (((src) << 9) & 0xfe00) \| (((src) >> 7) & 0x01c0))
164
165			// gb-- Disabled because I don't see any improvement
166			#if 0 && defined(__i386__) && defined(X86_ASSEMBLY)
167
168			#define FB_BLIT_2(dst, src) \
169			__asm__ ( "movl %0,%%ebx\n\t" \
170			"movl %0,%%ebp\n\t" \
171			"andl $0x1f001f00,%%ebx\n\t" \
172			"andl $0x007f007f,%0\n\t" \
173			"andl $0xe000e000,%%ebp\n\t" \
174			"shrl $8,%%ebx\n\t" \
175			"shrl $7,%%ebp\n\t" \
176			"shll $9,%0\n\t" \
177			"orl %%ebx,%%ebp\n\t" \
178			"orl %%ebp,%0\n\t" \
179			: "=r" (dst) : "0" (src) : "ebx", "ebp", "cc" )
180
181			#else
182
183			#define FB_BLIT_2(dst, src) \
184			(dst = (((src) >> 8) & 0x001f001f) \| (((src) << 9) & 0xfe00fe00) \| (((src) >> 7) & 0x01c001c0))
185
186			#endif
187
188			#define FB_DEPTH 16
189			#define FB_FUNC_NAME Blit_RGB565_NBO
190			#include "video_blit.h"
191
192			// Opposite byte order (untested)
193
194			#define FB_BLIT_1(dst, src) \
195			(dst = (((src) & 0x1f00) \| (((src) << 1) & 0xe0fe) \| (((src) >> 15) & 1)))
196
197			#define FB_BLIT_2(dst, src) \
198			(dst = (((src) & 0x1f001f00) \| (((src) << 1) & 0xe0fee0fe) \| (((src) >> 15) & 0x10001)))
199
200			#define FB_DEPTH 16
201			#define FB_FUNC_NAME Blit_RGB565_OBO
202			#include "video_blit.h"
203
204			#endif
205
206			/* -------------------------------------------------------------------------- */
207			/* --- RGB 888 --- */
208			/* -------------------------------------------------------------------------- */
209
210			#ifdef WORDS_BIGENDIAN
211			# define FB_FUNC_NAME Blit_RGB888_OBO
212			#else
213			# define FB_FUNC_NAME Blit_RGB888_NBO
214			#endif
215
216			#define FB_BLIT_2(dst, src) \
217			(dst = (((src) >> 24) & 0xff) \| (((src) >> 8) & 0xff00) \| (((src) & 0xff00) << 8) \| (((src) & 0xff) << 24))
218
219			#define FB_DEPTH 24
220			#include "video_blit.h"
221
222			/* -------------------------------------------------------------------------- */
223			/* --- BGR 888 --- */
224			/* -------------------------------------------------------------------------- */
225
226	gbeauche	1.2	// Native byte order [BE] (untested)
227	gbeauche	1.1
228			#ifdef WORDS_BIGENDIAN
229
230			#define FB_BLIT_2(dst, src) \
231			(dst = (((src) >> 16) & 0xff) \| ((src) & 0xff00) \| (((src) & 0xff) << 16))
232
233			#define FB_FUNC_NAME Blit_BGR888_NBO
234			#define FB_DEPTH 24
235			#include "video_blit.h"
236
237			#else
238
239	gbeauche	1.2	// Opposite byte order [LE] (untested)
240
241	gbeauche	1.1	#define FB_BLIT_2(dst, src) \
242			(dst = (((src) >> 16) & 0xff) \| ((src) & 0xff0000) \| (((src) & 0xff) << 16))
243
244			#define FB_FUNC_NAME Blit_BGR888_OBO
245			#define FB_DEPTH 24
246			#include "video_blit.h"
247
248			#endif
249
250	gbeauche	1.2	// Opposite byte order [BE] (untested) / Native byte order [LE] (untested)
251	gbeauche	1.1
252			#ifdef WORDS_BIGENDIAN
253			# define FB_FUNC_NAME Blit_BGR888_OBO
254			#else
255			# define FB_FUNC_NAME Blit_BGR888_NBO
256			#endif
257
258			#define FB_BLIT_2(dst, src) \
259			(dst = ((src) & 0xff00ff) \| (((src) & 0xff00) << 16))
260
261			#define FB_DEPTH 24
262			#include "video_blit.h"
263
264			/* -------------------------------------------------------------------------- */
265	cebix	1.5	/* --- 8-bit indexed to 16-bit mode color expansion --- */
266			/* -------------------------------------------------------------------------- */
267
268			static void Blit_Expand_8_To_16(uint8 * dest, const uint8 * p, uint32 length)
269			{
270			uint16 q = (uint16 )dest;
271			for (int i=0; i<length; i++)
272			q++ = ExpandMap[p++];
273			}
274
275			/* -------------------------------------------------------------------------- */
276			/* --- 8-bit indexed to 32-bit mode color expansion --- */
277			/* -------------------------------------------------------------------------- */
278
279			static void Blit_Expand_8_To_32(uint8 * dest, const uint8 * p, uint32 length)
280			{
281			uint32 q = (uint32 )dest;
282			for (int i=0; i<length; i++)
283			q++ = ExpandMap[p++];
284			}
285
286			/* -------------------------------------------------------------------------- */
287	gbeauche	1.1	/* --- Blitters to the host frame buffer, or XImage buffer --- */
288			/* -------------------------------------------------------------------------- */
289
290			// Function used to update the hosst frame buffer (DGA), or an XImage buffer (WIN)
291			// --> Shall be initialized only through the Screen_blitter_init() function
292			typedef void (Screen_blit_func)(uint8 dest, const uint8 * source, uint32 length);
293			Screen_blit_func Screen_blit = 0;
294
295			// Structure used to match the adequate framebuffer update function
296			struct Screen_blit_func_info {
297			int depth; // Screen depth
298			uint32 Rmask; // Red mask
299			uint32 Gmask; // Green mask
300			uint32 Bmask; // Blue mask
301			Screen_blit_func handler_nbo; // Update function (native byte order)
302			Screen_blit_func handler_obo; // Update function (opposite byte order)
303			};
304
305			// Table of visual formats supported and their respective handler
306			static Screen_blit_func_info Screen_blitters[] = {
307			#ifdef WORDS_BIGENDIAN
308			{ 1, 0x000000, 0x000000, 0x000000, Blit_Copy_Raw , Blit_Copy_Raw }, // NT
309			{ 8, 0x000000, 0x000000, 0x000000, Blit_Copy_Raw , Blit_Copy_Raw }, // OK (NBO)
310			{ 15, 0x007c00, 0x0003e0, 0x00001f, Blit_Copy_Raw , Blit_RGB555_OBO }, // OK (OBO)
311	gbeauche	1.2	{ 15, 0x00001f, 0x0003e0, 0x007c00, Blit_BGR555_NBO , Blit_BGR555_OBO }, // NT
312	gbeauche	1.1	{ 16, 0x00f800, 0x0007e0, 0x00001f, Blit_RGB565_NBO , Blit_RGB565_OBO }, // OK (OBO)
313			{ 24, 0xff0000, 0x00ff00, 0x0000ff, Blit_Copy_Raw , Blit_RGB888_OBO }, // OK (OBO)
314			{ 24, 0x0000ff, 0x00ff00, 0xff0000, Blit_BGR888_NBO , Blit_BGR888_OBO }, // NT
315	gbeauche	1.2	{ 32, 0xff0000, 0x00ff00, 0x0000ff, Blit_Copy_Raw , Blit_RGB888_OBO }, // OK
316			{ 32, 0x0000ff, 0x00ff00, 0xff0000, Blit_BGR888_NBO , Blit_BGR888_OBO } // OK
317	gbeauche	1.1	#else
318			{ 1, 0x000000, 0x000000, 0x000000, Blit_Copy_Raw , Blit_Copy_Raw }, // NT
319			{ 8, 0x000000, 0x000000, 0x000000, Blit_Copy_Raw , Blit_Copy_Raw }, // OK (NBO)
320			{ 15, 0x007c00, 0x0003e0, 0x00001f, Blit_RGB555_NBO , Blit_Copy_Raw }, // OK (NBO)
321	gbeauche	1.2	{ 15, 0x00001f, 0x0003e0, 0x007c00, Blit_BGR555_NBO , Blit_BGR555_OBO }, // NT
322	gbeauche	1.1	{ 16, 0x00f800, 0x0007e0, 0x00001f, Blit_RGB565_NBO , Blit_RGB565_OBO }, // OK (NBO)
323			{ 24, 0xff0000, 0x00ff00, 0x0000ff, Blit_RGB888_NBO , Blit_Copy_Raw }, // OK (NBO)
324			{ 24, 0x0000ff, 0x00ff00, 0xff0000, Blit_BGR888_NBO , Blit_BGR888_OBO }, // NT
325			{ 32, 0xff0000, 0x00ff00, 0x0000ff, Blit_RGB888_NBO , Blit_Copy_Raw }, // OK (NBO)
326			{ 32, 0x0000ff, 0x00ff00, 0xff0000, Blit_BGR888_NBO , Blit_BGR888_OBO } // NT
327			#endif
328			};
329
330			// Initialize the framebuffer update function
331			// Returns FALSE, if the function was to be reduced to a simple memcpy()
332			// --> In that case, VOSF is not necessary
333	cebix	1.4	bool Screen_blitter_init(XVisualInfo * visual_info, bool native_byte_order, video_depth mac_depth)
334	gbeauche	1.1	{
335	gbeauche	1.3	#if REAL_ADDRESSING \|\| DIRECT_ADDRESSING
336	cebix	1.4	if (mac_depth == VDEPTH_1BIT) {
337
338			// 1-bit mode uses a 1-bit X image, so there's no need for special blitting routines
339			Screen_blit = Blit_Copy_Raw;
340
341			} else {
342
343			visualFormat.depth = visual_info->depth;
344			visualFormat.Rmask = visual_info->red_mask;
345			visualFormat.Gmask = visual_info->green_mask;
346			visualFormat.Bmask = visual_info->blue_mask;
347	cebix	1.5
348	cebix	1.4	// Compute RGB shift values
349			visualFormat.Rshift = 0;
350			for (uint32 Rmask = visualFormat.Rmask; Rmask && ((Rmask & 1) != 1); Rmask >>= 1)
351			++visualFormat.Rshift;
352			visualFormat.Gshift = 0;
353			for (uint32 Gmask = visualFormat.Gmask; Gmask && ((Gmask & 1) != 1); Gmask >>= 1)
354			++visualFormat.Gshift;
355			visualFormat.Bshift = 0;
356			for (uint32 Bmask = visualFormat.Bmask; Bmask && ((Bmask & 1) != 1); Bmask >>= 1)
357			++visualFormat.Bshift;
358	cebix	1.5
359			bool blitter_found = false;
360
361			// 8-bit mode on 16/32-bit screen?
362			if (mac_depth == VDEPTH_8BIT && visualFormat.depth > 8) {
363			if (visual_info->depth <= 16) {
364			Screen_blit = Blit_Expand_8_To_16;
365			blitter_found = true;
366			} else {
367			Screen_blit = Blit_Expand_8_To_32;
368			blitter_found = true;
369			}
370			}
371	gbeauche	1.1
372	cebix	1.4	// Search for an adequate blit function
373			const int blitters_count = sizeof(Screen_blitters)/sizeof(Screen_blitters[0]);
374			for (int i = 0; !blitter_found && (i < blitters_count); i++) {
375			if ( (visualFormat.depth == Screen_blitters[i].depth)
376			&& (visualFormat.Rmask == Screen_blitters[i].Rmask)
377			&& (visualFormat.Gmask == Screen_blitters[i].Gmask)
378			&& (visualFormat.Bmask == Screen_blitters[i].Bmask)
379			)
380			{
381			blitter_found = true;
382			Screen_blit = native_byte_order
383			? Screen_blitters[i].handler_nbo
384			: Screen_blitters[i].handler_obo
385			;
386			}
387	gbeauche	1.1	}
388
389	cebix	1.4	// No appropriate blitter found, dump RGB mask values and abort()
390			if (!blitter_found) {
391			fprintf(stderr, "### No appropriate blitter found\n");
392			fprintf(stderr, "\tR/G/B mask values : 0x%06x, 0x%06x, 0x%06x (depth = %d)\n",
393			visualFormat.Rmask, visualFormat.Gmask, visualFormat.Bmask, visualFormat.depth);
394			fprintf(stderr, "\tR/G/B shift values : %d/%d/%d\n",
395			visualFormat.Rshift, visualFormat.Gshift, visualFormat.Bshift);
396			abort();
397			}
398	gbeauche	1.1	}
399	gbeauche	1.3	#else
400			// The UAE memory handlers will blit correctly
401			// --> no need for specialised blitters here
402			Screen_blit = Blit_Copy_Raw;
403			#endif
404	gbeauche	1.1
405			// If the blitter simply reduces to a copy, we don't need VOSF in DGA mode
406			// --> In that case, we return FALSE
407			return (Screen_blit != Blit_Copy_Raw);
408			}
409			#endif /* ENABLE_VOSF */