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root/cebix/BasiliskII/src/video.cpp

Comparing BasiliskII/src/video.cpp (file contents):
Revision 1.16 by cebix, 2001-07-01T00:46:31Z vs.
Revision 1.23 by cebix, 2001-07-11T19:26:13Z

#	Line 23 | Line 23
23		*  SEE ALSO
24		*    Inside Macintosh: Devices, chapter 1 "Device Manager"
25		*    Designing Cards and Drivers for the Macintosh Family, Second Edition
26	+	*    Designing PCI Cards and Drivers for Power Macintosh Computers
27	+	*    Display Device Driver Guide
28		*/
29
30		#include <stdio.h>
#	Line 40 | Line 42
42
43
44		// List of supported video modes
45	<	std::vector<video_mode> VideoModes;
45	>	vector<video_mode> VideoModes;
46
47		// Description of the main monitor
48		monitor_desc VideoMonitor;
49
50	+	// Depth code -> Apple mode mapping
51	+	uint16 apple_mode_for_depth[6];
52	+
53		// Local variables (per monitor)
54		struct {
55		monitor_desc *desc;                     // Pointer to description of monitor handled by this instance of the driver
56		uint8 palette[256 * 3];         // Color palette, 256 entries, RGB
57		bool luminance_mapping;         // Luminance mapping on/off
58		bool interrupts_enabled;        // VBL interrupts on/off
59	+	bool dm_present;                        // We received a GetVideoParameters call, so the Display Manager seems to be present
60		uint32 gamma_table;                     // Mac address of gamma table
61		int alloc_gamma_table_size;     // Allocated size of gamma table
62		uint16 current_mode;            // Currently selected depth/resolution
#	Line 62 | Line 68 | struct {
68
69
70		/*
71	+	*  Initialize apple_mode_for_depth[] array from VideoModes list
72	+	*/
73	+
74	+	void video_init_depth_list(void)
75	+	{
76	+	uint16 mode = 0x80;
77	+	for (int depth = VDEPTH_1BIT; depth <= VDEPTH_32BIT; depth++) {
78	+	if (video_has_depth(video_depth(depth)))
79	+	apple_mode_for_depth[depth] = mode++;
80	+	else
81	+	apple_mode_for_depth[depth] = 0;
82	+	}
83	+	}
84	+
85	+
86	+	/*
87	+	*  Check whether a mode with the specified depth exists
88	+	*/
89	+
90	+	bool video_has_depth(video_depth depth)
91	+	{
92	+	vector<video_mode>::const_iterator i = VideoModes.begin(), end = VideoModes.end();
93	+	while (i != end) {
94	+	if (i->depth == depth)
95	+	return true;
96	+	++i;
97	+	}
98	+	return false;
99	+	}
100	+
101	+
102	+	/*
103		*  Check whether specified resolution ID is one of the supported resolutions
104		*/
105
106		static bool has_resolution(uint32 id)
107		{
108	<	std::vector<video_mode>::const_iterator i = VideoModes.begin(), end = VideoModes.end();
109	<	while (i != end) {
108	>	vector<video_mode>::const_iterator i, end = VideoModes.end();
109	>	for (i = VideoModes.begin(); i != end; ++i) {
110		if (i->resolution_id == id)
111		return true;
74	–	++i;
112		}
113		return false;
114		}
#	Line 81 | Line 118 | static bool has_resolution(uint32 id)
118		*  Find specified mode (depth/resolution) (or VideoModes.end() if not found)
119		*/
120
121	<	static std::vector<video_mode>::const_iterator find_mode(uint16 mode, uint32 id)
121	>	static vector<video_mode>::const_iterator find_mode(uint16 mode, uint32 id)
122		{
123	<	std::vector<video_mode>::const_iterator i = VideoModes.begin(), end = VideoModes.end();
124	<	while (i != end) {
123	>	vector<video_mode>::const_iterator i, end = VideoModes.end();
124	>	for (i = VideoModes.begin(); i != end; ++i) {
125		if (i->resolution_id == id && DepthToAppleMode(i->depth) == mode)
126		return i;
90	–	++i;
127		}
128		return i;
129		}
#	Line 100 | Line 136 | static std::vector<video_mode>::const_it
136		static video_depth max_depth_of_resolution(uint32 id)
137		{
138		video_depth m = VDEPTH_1BIT;
139	<	std::vector<video_mode>::const_iterator i = VideoModes.begin(), end = VideoModes.end();
140	<	while (i != end) {
139	>	vector<video_mode>::const_iterator i, end = VideoModes.end();
140	>	for (i = VideoModes.begin(); i != end; ++i) {
141		if (i->depth > m)
142		m = i->depth;
107	–	++i;
143		}
144		return m;
145		}
#	Line 116 | Line 151 | static video_depth max_depth_of_resoluti
151
152		static void get_size_of_resolution(uint32 id, uint32 &x, uint32 &y)
153		{
154	<	std::vector<video_mode>::const_iterator i = VideoModes.begin(), end = VideoModes.end();
155	<	while (i != end) {
154	>	vector<video_mode>::const_iterator i, end = VideoModes.end();
155	>	for (i = VideoModes.begin(); i != end; ++i) {
156		if (i->resolution_id == id) {
157		x = i->x;
158		y = i->y;
159		return;
160		}
161	<	++i;
161	>	}
162	>	x = y = 0;
163	>	}
164	>
165	>
166	>	/*
167	>	*  Get bytes-per-row value for specified resolution/depth
168	>	*/
169	>
170	>	uint32 video_bytes_per_row(video_depth depth, uint32 id)
171	>	{
172	>	vector<video_mode>::const_iterator i, end = VideoModes.end();
173	>	for (i = VideoModes.begin(); i != end; ++i) {
174	>	if (i->depth == depth && i->resolution_id == id)
175	>	return i->bytes_per_row;
176	>	}
177	>	uint32 x, y;
178	>	get_size_of_resolution(id, x, y);
179	>	return TrivialBytesPerRow(x, depth);
180	>	}
181	>
182	>
183	>	/*
184	>	*  Find palette size for given color depth
185	>	*/
186	>
187	>	static int palette_size(video_depth depth)
188	>	{
189	>	switch (depth) {
190	>	case VDEPTH_1BIT: return 2;
191	>	case VDEPTH_2BIT: return 4;
192	>	case VDEPTH_4BIT: return 16;
193	>	case VDEPTH_8BIT: return 256;
194	>	case VDEPTH_16BIT: return 32;
195	>	case VDEPTH_32BIT: return 256;
196	>	default: return 0;
197		}
198		}
199
#	Line 139 | Line 209 | static void set_gray_palette(void)
209		VidLocal.palette[i * 3 + 1] = 127;
210		VidLocal.palette[i * 3 + 2] = 127;
211		}
212	<	video_set_palette(VidLocal.palette);
212	>	video_set_palette(VidLocal.palette, 256);
213		}
214
215
#	Line 150 | Line 220 | static void set_gray_palette(void)
220		static void load_ramp_palette(void)
221		{
222		// Find tables for gamma correction
223	<	uint8 *red_gamma, *green_gamma, *blue_gamma;
223	>	uint8 *red_gamma = NULL, *green_gamma = NULL, *blue_gamma = NULL;
224		bool have_gamma = false;
225		int data_width = 0;
226		if (VidLocal.gamma_table) {
#	Line 182 | Line 252 | static void load_ramp_palette(void)
252		*p++ = blue;
253		}
254
255	<	video_set_palette(VidLocal.palette);
255	>	video_set_palette(VidLocal.palette, num);
256		}
257
258
#	Line 265 | Line 335 | static bool set_gamma_table(uint32 user_
335		Mac2Mac_memcpy(table, user_table, size);
336		}
337
338	<	if (IsDirectMode(VidLocal.current_mode))
338	>	if (IsDirectMode(VidLocal.desc->mode))
339		load_ramp_palette();
340
341		return true;
#	Line 273 | Line 343 | static bool set_gamma_table(uint32 user_
343
344
345		/*
346	+	*  Switch video mode
347	+	*/
348	+
349	+	static void switch_mode(const video_mode &mode, uint32 param, uint32 dce)
350	+	{
351	+	// Switch mode
352	+	set_gray_palette();
353	+	video_switch_to_mode(mode);
354	+
355	+	// Update VidLocal
356	+	VidLocal.current_mode = DepthToAppleMode(mode.depth);
357	+	VidLocal.current_id = mode.resolution_id;
358	+
359	+	uint32 frame_base = VidLocal.desc->mac_frame_base;
360	+
361	+	M68kRegisters r;
362	+	uint32 sp = VidLocal.slot_param;
363	+	r.a[0] = sp;
364	+
365	+	// Find functional sResource for this display
366	+	WriteMacInt8(sp + spSlot, ReadMacInt8(dce + dCtlSlot));
367	+	WriteMacInt8(sp + spID, ReadMacInt8(dce + dCtlSlotId));
368	+	WriteMacInt8(sp + spExtDev, 0);
369	+	r.d[0] = 0x0016;
370	+	Execute68kTrap(0xa06e, &r);     // SRsrcInfo()
371	+	uint32 rsrc = ReadMacInt32(sp + spPointer);
372	+
373	+	// Patch minorBase (otherwise rebooting won't work)
374	+	WriteMacInt8(sp + spID, 0x0a); // minorBase
375	+	r.d[0] = 0x0006;
376	+	Execute68kTrap(0xa06e, &r); // SFindStruct()
377	+	uint32 minor_base = ReadMacInt32(sp + spPointer) - ROMBaseMac;
378	+	ROMBaseHost[minor_base + 0] = frame_base >> 24;
379	+	ROMBaseHost[minor_base + 1] = frame_base >> 16;
380	+	ROMBaseHost[minor_base + 2] = frame_base >> 8;
381	+	ROMBaseHost[minor_base + 3] = frame_base;
382	+
383	+	// Patch video mode parameter table
384	+	WriteMacInt32(sp + spPointer, rsrc);
385	+	WriteMacInt8(sp + spID, DepthToAppleMode(mode.depth));
386	+	r.d[0] = 0x0006;
387	+	Execute68kTrap(0xa06e, &r); // SFindStruct()
388	+	WriteMacInt8(sp + spID, 0x01);
389	+	r.d[0] = 0x0006;
390	+	Execute68kTrap(0xa06e, &r); // SFindStruct()
391	+	uint32 p = ReadMacInt32(sp + spPointer) - ROMBaseMac;
392	+	ROMBaseHost[p +  8] = mode.bytes_per_row >> 8;
393	+	ROMBaseHost[p +  9] = mode.bytes_per_row;
394	+	ROMBaseHost[p + 14] = mode.y >> 8;
395	+	ROMBaseHost[p + 15] = mode.y;
396	+	ROMBaseHost[p + 16] = mode.x >> 8;
397	+	ROMBaseHost[p + 17] = mode.x;
398	+
399	+	// Recalculate slot ROM checksum
400	+	ChecksumSlotROM();
401	+
402	+	// Update sResource
403	+	WriteMacInt8(sp + spID, ReadMacInt8(dce + dCtlSlotId));
404	+	r.d[0] = 0x002b;
405	+	Execute68kTrap(0xa06e, &r); // SUpdateSRT()
406	+
407	+	// Update frame buffer base in DCE and param block
408	+	WriteMacInt32(dce + dCtlDevBase, frame_base);
409	+	WriteMacInt32(param + csBaseAddr, frame_base);
410	+
411	+	// Patch frame buffer base address for MacOS versions <7.6
412	+	if (!VidLocal.dm_present) { // Only do this when no Display Manager seems to be present; otherwise, the screen will not get redrawn
413	+	WriteMacInt32(0x824, frame_base);                       // ScrnBase
414	+	WriteMacInt32(0x898, frame_base);                       // CrsrBase
415	+	uint32 gdev = ReadMacInt32(0x8a4);                      // MainDevice
416	+	gdev = ReadMacInt32(gdev);
417	+	uint32 pmap = ReadMacInt32(gdev + 0x16);        // gdPMap
418	+	pmap = ReadMacInt32(pmap);
419	+	WriteMacInt32(pmap, frame_base);                        // baseAddr
420	+	}
421	+	}
422	+
423	+
424	+	/*
425		*  Driver Open() routine
426		*/
427
#	Line 292 | Line 441 | int16 VideoDriverOpen(uint32 pb, uint32
441		VidLocal.current_id = VidLocal.desc->mode.resolution_id;
442		VidLocal.preferred_mode = VidLocal.current_mode;
443		VidLocal.preferred_id = VidLocal.current_id;
444	+	VidLocal.dm_present = false;
445
446		// Allocate Slot Manager parameter block in Mac RAM
447		M68kRegisters r;
#	Line 335 | Line 485 | int16 VideoDriverControl(uint32 pb, uint
485		return paramErr;
486
487		if (mode != VidLocal.current_mode) {
488	<	std::vector<video_mode>::const_iterator i = find_mode(mode, VidLocal.current_id);
488	>	vector<video_mode>::const_iterator i = find_mode(mode, VidLocal.current_id);
489		if (i == VideoModes.end())
490		return paramErr;
491	<	set_gray_palette();
342	<	video_switch_to_mode(*i);
343	<	VidLocal.current_mode = mode;
344	<	WriteMacInt32(param + csBaseAddr, VidLocal.desc->mac_frame_base);
345	<	WriteMacInt32(dce + dCtlDevBase, VidLocal.desc->mac_frame_base);
491	>	switch_mode(*i, param, dce);
492		}
493		D(bug("  base %08x\n", VidLocal.desc->mac_frame_base));
494		return noErr;
#	Line 351 | Line 497 | int16 VideoDriverControl(uint32 pb, uint
497		case cscSetEntries:             // Set palette
498		case cscDirectSetEntries: {
499		D(bug(" (Direct)SetEntries table %08x, count %d, start %d\n", ReadMacInt32(param + csTable), ReadMacInt16(param + csCount), ReadMacInt16(param + csStart)));
500	<	bool is_direct = IsDirectMode(VidLocal.current_mode);
500	>	bool is_direct = IsDirectMode(VidLocal.desc->mode);
501		if (code == cscSetEntries && is_direct)
502		return controlErr;
503		if (code == cscDirectSetEntries && !is_direct)
#	Line 365 | Line 511 | int16 VideoDriverControl(uint32 pb, uint
511		return paramErr;
512
513		// Find tables for gamma correction
514	<	uint8 *red_gamma, *green_gamma, *blue_gamma;
514	>	uint8 *red_gamma = NULL, *green_gamma = NULL, *blue_gamma = NULL;
515		bool have_gamma = false;
516		int data_width = 0;
517		if (VidLocal.gamma_table) {
#	Line 423 | Line 569 | int16 VideoDriverControl(uint32 pb, uint
569		s_pal += 8;
570		}
571		}
572	<	video_set_palette(VidLocal.palette);
572	>	video_set_palette(VidLocal.palette, palette_size(VidLocal.desc->mode.depth));
573		return noErr;
574		}
575
#	Line 446 | Line 592 | int16 VideoDriverControl(uint32 pb, uint
592		0xffff0000,             // 16 bpp
593		0xffffffff              // 32 bpp
594		};
595	<	uint32 p = VidLocal.desc->mac_frame_base;
595	>	uint32 frame_base = VidLocal.desc->mac_frame_base;
596		uint32 pat = pattern[VidLocal.desc->mode.depth];
597		bool invert = (VidLocal.desc->mode.depth == VDEPTH_32BIT);
598		for (uint32 y=0; y<VidLocal.desc->mode.y; y++) {
599		for (uint32 x=0; x<VidLocal.desc->mode.bytes_per_row; x+=4) {
600	<	WriteMacInt32(p + x, pat);
600	>	WriteMacInt32(frame_base + x, pat);
601		if (invert)
602		pat = ~pat;
603		}
604	<	p += VidLocal.desc->mode.bytes_per_row;
604	>	frame_base += VidLocal.desc->mode.bytes_per_row;
605		pat = ~pat;
606		}
607
608	<	if (IsDirectMode(VidLocal.current_mode))
608	>	if (IsDirectMode(VidLocal.desc->mode))
609		load_ramp_palette();
610
611		return noErr;
#	Line 476 | Line 622 | int16 VideoDriverControl(uint32 pb, uint
622		return noErr;
623
624		case cscSetDefaultMode: { // Set default color depth
625	<	uint16 mode = ReadMacInt16(param + csMode);
626	<	D(bug(" SetDefaultMode %04x\n", mode));
625	>	uint16 mode = ReadMacInt8(param + csMode);
626	>	D(bug(" SetDefaultMode %02x\n", mode));
627		VidLocal.preferred_mode = mode;
628		return noErr;
629		}
#	Line 494 | Line 640 | int16 VideoDriverControl(uint32 pb, uint
640		return paramErr;
641
642		if (mode != VidLocal.current_mode || id != VidLocal.current_id) {
643	<	std::vector<video_mode>::const_iterator i = find_mode(mode, id);
643	>	vector<video_mode>::const_iterator i = find_mode(mode, id);
644		if (i == VideoModes.end())
645		return paramErr;
646	<	set_gray_palette();
501	<	video_switch_to_mode(*i);
502	<	VidLocal.current_mode = mode;
503	<	VidLocal.current_id = id;
504	<	uint32 frame_base = VidLocal.desc->mac_frame_base;
505	<	WriteMacInt32(param + csBaseAddr, frame_base);
506	<
507	<	M68kRegisters r;
508	<	uint32 sp = VidLocal.slot_param;
509	<	r.a[0] = sp;
510	<
511	<	// Find functional sResource for this display
512	<	WriteMacInt8(sp + spSlot, ReadMacInt8(dce + dCtlSlot));
513	<	WriteMacInt8(sp + spID, ReadMacInt8(dce + dCtlSlotId));
514	<	WriteMacInt8(sp + spExtDev, 0);
515	<	r.d[0] = 0x0016;
516	<	Execute68kTrap(0xa06e, &r);     // SRsrcInfo()
517	<	uint32 rsrc = ReadMacInt32(sp + spPointer);
518	<
519	<	// Patch minorBase (otherwise rebooting won't work)
520	<	WriteMacInt8(sp + spID, 0x0a); // minorBase
521	<	r.d[0] = 0x0006;
522	<	Execute68kTrap(0xa06e, &r); // SFindStruct()
523	<	uint32 minor_base = ReadMacInt32(sp + spPointer) - ROMBaseMac;
524	<	ROMBaseHost[minor_base + 0] = frame_base >> 24;
525	<	ROMBaseHost[minor_base + 1] = frame_base >> 16;
526	<	ROMBaseHost[minor_base + 2] = frame_base >> 8;
527	<	ROMBaseHost[minor_base + 3] = frame_base;
528	<
529	<	// Patch video mode parameter table
530	<	WriteMacInt32(sp + spPointer, rsrc);
531	<	WriteMacInt8(sp + spID, mode);
532	<	r.d[0] = 0x0006;
533	<	Execute68kTrap(0xa06e, &r); // SFindStruct()
534	<	WriteMacInt8(sp + spID, 0x01);
535	<	r.d[0] = 0x0006;
536	<	Execute68kTrap(0xa06e, &r); // SFindStruct()
537	<	uint32 p = ReadMacInt32(sp + spPointer) - ROMBaseMac;
538	<	ROMBaseHost[p +  8] = i->bytes_per_row >> 8;
539	<	ROMBaseHost[p +  9] = i->bytes_per_row;
540	<	ROMBaseHost[p + 14] = i->y >> 8;
541	<	ROMBaseHost[p + 15] = i->y;
542	<	ROMBaseHost[p + 16] = i->x >> 8;
543	<	ROMBaseHost[p + 17] = i->x;
544	<
545	<	// Recalculate slot ROM checksum
546	<	ChecksumSlotROM();
547	<
548	<	// Update sResource
549	<	WriteMacInt8(sp + spID, ReadMacInt8(dce + dCtlSlotId));
550	<	r.d[0] = 0x002b;
551	<	Execute68kTrap(0xa06e, &r); // SUpdateSRT()
552	<
553	<	// Update frame buffer base in DCE
554	<	WriteMacInt32(dce + dCtlDevBase, frame_base);
646	>	switch_mode(*i, param, dce);
647		}
648		D(bug("  base %08x\n", VidLocal.desc->mac_frame_base));
649		return noErr;
#	Line 644 | Line 736 | int16 VideoDriverStatus(uint32 pb, uint3
736
737		case cscGetGray:                        // Get luminance mapping flag
738		D(bug(" GetGray -> %d\n", VidLocal.luminance_mapping));
739	<	WriteMacInt16(param, VidLocal.luminance_mapping ? 0x0100 : 0);
739	>	WriteMacInt8(param, VidLocal.luminance_mapping ? 1 : 0);
740		return noErr;
741
742		case cscGetInterrupt:           // Get interrupt disable flag
743		D(bug(" GetInterrupt -> %d\n", VidLocal.interrupts_enabled));
744	<	WriteMacInt16(param, VidLocal.interrupts_enabled ? 0 : 0x0100);
744	>	WriteMacInt8(param, VidLocal.interrupts_enabled ? 0 : 1);
745		return noErr;
746
747		case cscGetGamma:
#	Line 658 | Line 750 | int16 VideoDriverStatus(uint32 pb, uint3
750		return noErr;
751
752		case cscGetDefaultMode:         // Get default color depth
753	<	D(bug(" GetDefaultMode -> %04x\n", VidLocal.preferred_mode));
754	<	WriteMacInt16(param + csMode, VidLocal.preferred_mode);
753	>	D(bug(" GetDefaultMode -> %02x\n", VidLocal.preferred_mode));
754	>	WriteMacInt8(param + csMode, VidLocal.preferred_mode);
755		return noErr;
756
757		case cscGetCurrentMode:         // Get current video mode (depth and resolution)
#	Line 743 | Line 835 | int16 VideoDriverStatus(uint32 pb, uint3
835		WriteMacInt32(param + csVerticalLines, y);
836		WriteMacInt32(param + csRefreshRate, 75 << 16);
837		WriteMacInt16(param + csMaxDepthMode, DepthToAppleMode(max_depth_of_resolution(id)));
838	+	WriteMacInt32(param + csResolutionFlags, 0);
839		return noErr;
840		}
841
#	Line 750 | Line 843 | int16 VideoDriverStatus(uint32 pb, uint3
843		uint32 id = ReadMacInt32(param + csDisplayModeID);
844		uint16 mode = ReadMacInt16(param + csDepthMode);
845		D(bug(" GetVideoParameters %04x/%08x\n", mode, id));
846	+	VidLocal.dm_present = true;     // Display Manager seems to be present
847
848	<	std::vector<video_mode>::const_iterator i = VideoModes.begin(), end = VideoModes.end();
849	<	while (i != end) {
848	>	vector<video_mode>::const_iterator i, end = VideoModes.end();
849	>	for (i = VideoModes.begin(); i != end; ++i) {
850		if (DepthToAppleMode(i->depth) == mode && i->resolution_id == id) {
851		uint32 vp = ReadMacInt32(param + csVPBlockPtr);
852		WriteMacInt32(vp + vpBaseOffset, 0);
#	Line 768 | Line 862 | int16 VideoDriverStatus(uint32 pb, uint3
862		WriteMacInt32(vp + vpVRes, 0x00480000);
863		uint32 pix_type, pix_size, cmp_count, cmp_size, dev_type;
864		switch (i->depth) {
771	–	case VDEPTH_1BIT:
772	–	pix_type = 0; pix_size = 1;
773	–	cmp_count = 1; cmp_size = 1;
774	–	dev_type = 0; // CLUT
775	–	break;
776	–	case VDEPTH_2BIT:
777	–	pix_type = 0; pix_size = 2;
778	–	cmp_count = 1; cmp_size = 2;
779	–	dev_type = 0; // CLUT
780	–	break;
781	–	case VDEPTH_4BIT:
782	–	pix_type = 0; pix_size = 4;
783	–	cmp_count = 1; cmp_size = 4;
784	–	dev_type = 0; // CLUT
785	–	break;
786	–	case VDEPTH_8BIT:
787	–	pix_type = 0; pix_size = 8;
788	–	cmp_count = 1; cmp_size = 8;
789	–	dev_type = 0; // CLUT
790	–	break;
865		case VDEPTH_16BIT:
866		pix_type = 0x10; pix_size = 16;
867		cmp_count = 3; cmp_size = 5;
#	Line 798 | Line 872 | int16 VideoDriverStatus(uint32 pb, uint3
872		cmp_count = 3; cmp_size = 8;
873		dev_type = 2; // direct
874		break;
875	+	default:
876	+	pix_type = 0; pix_size = 1 << i->depth;
877	+	cmp_count = 1; cmp_size = 1 << i->depth;
878	+	dev_type = 0; // CLUT
879	+	break;
880		}
881		WriteMacInt16(vp + vpPixelType, pix_type);
882		WriteMacInt16(vp + vpPixelSize, pix_size);
#	Line 807 | Line 886 | int16 VideoDriverStatus(uint32 pb, uint3
886		WriteMacInt32(param + csDeviceType, dev_type);
887		return noErr;
888		}
810	–	++i;
889		}
890		return paramErr; // specified resolution/depth not supported
891		}
892
893	+	case cscGetMultiConnect: {
894	+	uint32 conn = ReadMacInt32(param + csDisplayCountOrNumber);
895	+	D(bug(" GetMultiConnect %08x\n", conn));
896	+	if (conn == 0xffffffff) {       // Get number of connections
897	+	WriteMacInt32(param + csDisplayCountOrNumber, 1); // Single-headed
898	+	return noErr;
899	+	} else if (conn == 1) {         // Get information about first connection
900	+	WriteMacInt16(param + csConnectInfo + csDisplayType, 8);                // Modeless connection
901	+	WriteMacInt8(param + csConnectInfo + csConnectTaggedType, 0);
902	+	WriteMacInt8(param + csConnectInfo + csConnectTaggedData, 0);
903	+	WriteMacInt32(param + csConnectInfo + csConnectFlags, 0x43);    // All modes valid and safe, non-standard tagging
904	+	WriteMacInt32(param + csConnectInfo + csDisplayComponent, 0);
905	+	return noErr;
906	+	} else
907	+	return paramErr;
908	+	}
909	+
910		default:
911		printf("WARNING: Unknown VideoDriverStatus(%d)\n", code);
912		return statusErr;

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