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root/cebix/BasiliskII/src/include/video.h

Comparing BasiliskII/src/include/video.h (file contents):
Revision 1.2 by cebix, 1999-10-19T19:28:28Z vs.
Revision 1.12 by cebix, 2001-07-03T19:20:47Z

#	Line 1 | Line 1
1		/*
2		*  video.h - Video/graphics emulation
3		*
4	<	*  Basilisk II (C) 1997-1999 Christian Bauer
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
#	Line 21 | Line 21
21		#ifndef VIDEO_H
22		#define VIDEO_H
23
24	<	// Description for one (possibly virtual) monitor
25	<	enum {
26	<	VMODE_1BIT,
27	<	VMODE_2BIT,
28	<	VMODE_4BIT,
29	<	VMODE_8BIT,
30	<	VMODE_16BIT,
31	<	VMODE_32BIT
24	>	#include <vector>
25	>
26	>	#ifndef NO_STD_NAMESPACE
27	>	using std::vector;
28	>	#endif
29	>
30	>	/*
31	>	Some of the terminology here is completely frelled. In Basilisk II, a
32	>	"video mode" refers to a combination of resolution and color depth, and
33	>	this information is stored in a video_mode structure. In Apple
34	>	documentation, a "mode" historically refers to the color depth only
35	>	(because old Macs had fixed-frequency monitors and could not change the
36	>	resolution). These "modes" are assigned a number (0x80, 0x81, etc.),
37	>	which we here call "Apple mode". When Macs learned how to deal with
38	>	multiscan monitors, Apple introduced another type of "mode", also having
39	>	numbers starting from 0x80 but refrerring to the resolution and/or video
40	>	timing of the display (it's possible to have two modes with the same
41	>	dimension but different refresh rates). We call this a "resolution ID".
42	>	The combination of "Apple mode" and "ID" corresponds to a Basilisk II
43	>	"video mode". To make the confusion worse, the video driver control call
44	>	that sets the color depth is called "SetMode" while the one that sets
45	>	both depth and resolution is "SwitchMode"...
46	>	*/
47	>
48	>	// Color depth codes
49	>	enum video_depth {
50	>	VDEPTH_1BIT,  // 2 colors
51	>	VDEPTH_2BIT,  // 4 colors
52	>	VDEPTH_4BIT,  // 16 colors
53	>	VDEPTH_8BIT,  // 256 colors
54	>	VDEPTH_16BIT, // "Thousands"
55	>	VDEPTH_32BIT  // "Millions"
56		};
57
58	<	#define IsDirectMode(x) ((x) == VMODE_16BIT || (x) == VMODE_32BIT)
58	>	// For compatibility reasons with older (pre-Display Manager) versions of
59	>	// MacOS, the Apple modes must start at 0x80 and be contiguous. Therefore
60	>	// we construct an array to map the depth codes to the corresponding Apple
61	>	// mode. This array is initialized by video_init_depth_list() which must
62	>	// be called by the platform-dependant VideoInit() routine after filling
63	>	// the VideoModes array.
64	>	extern uint16 apple_mode_for_depth[6];
65	>
66	>	inline uint16 DepthToAppleMode(video_depth depth)
67	>	{
68	>	return apple_mode_for_depth[depth];
69	>	}
70	>
71	>	inline bool IsDirectMode(video_depth depth)
72	>	{
73	>	return depth == VDEPTH_16BIT || depth == VDEPTH_32BIT;
74	>	}
75	>
76	>	// Return the depth code that corresponds to the specified bits-per-pixel value
77	>	inline video_depth DepthModeForPixelDepth(int depth)
78	>	{
79	>	switch (depth) {
80	>	case 1: return VDEPTH_1BIT;
81	>	case 2: return VDEPTH_2BIT;
82	>	case 4: return VDEPTH_4BIT;
83	>	case 8: return VDEPTH_8BIT;
84	>	case 15: case 16: return VDEPTH_16BIT;
85	>	case 24: case 32: return VDEPTH_32BIT;
86	>	default: return VDEPTH_1BIT;
87	>	}
88	>	}
89	>
90	>	// Return a bytes-per-row value (assuming no padding) for the specified depth and pixel width
91	>	inline uint32 TrivialBytesPerRow(uint32 width, video_depth depth)
92	>	{
93	>	switch (depth) {
94	>	case VDEPTH_1BIT: return width / 8;
95	>	case VDEPTH_2BIT: return width / 4;
96	>	case VDEPTH_4BIT: return width / 2;
97	>	case VDEPTH_8BIT: return width;
98	>	case VDEPTH_16BIT: return width * 2;
99	>	case VDEPTH_32BIT: return width * 4;
100	>	default: return width;
101	>	}
102	>	}
103
104	<	struct video_desc {
105	<	uint32 mac_frame_base;  // Mac frame buffer address
106	<	uint32 bytes_per_row;   // Bytes per row
104	>	/*
105	>	You are not completely free in your selection of depth/resolution
106	>	combinations:
107	>	1) the lowest supported color depth must be available in all
108	>	resolutions
109	>	2) if one resolution provides a certain color depth, it must also
110	>	provide all lower supported depths
111	>
112	>	For example, it is possible to have this set of modes:
113	>	640x480 @ 8 bit
114	>	640x480 @ 32 bit
115	>	800x600 @ 8 bit
116	>	800x600 @ 32 bit
117	>	1024x768 @ 8 bit
118	>
119	>	But this is not possible (violates rule 1):
120	>	640x480 @ 8 bit
121	>	800x600 @ 8 bit
122	>	1024x768 @ 1 bit
123	>
124	>	And neither is this (violates rule 2, 640x480 @ 16 bit is missing):
125	>	640x480 @ 8 bit
126	>	640x480 @ 32 bit
127	>	800x600 @ 8 bit
128	>	800x600 @ 16 bit
129	>	1024x768 @ 8 bit
130	>	*/
131	>
132	>	// Description of a video mode
133	>	struct video_mode {
134		uint32 x;                               // X size of screen (pixels)
135		uint32 y;                               // Y size of screen (pixels)
136	<	int mode;                               // Video mode
136	>	uint32 resolution_id;   // Resolution ID (should be >= 0x80 and uniquely identify the sets of modes with the same X/Y size)
137	>	uint32 bytes_per_row;   // Bytes per row of frame buffer
138	>	video_depth depth;              // Color depth (see definitions above)
139	>	};
140	>
141	>	inline bool IsDirectMode(const video_mode &mode)
142	>	{
143	>	return IsDirectMode(mode.depth);
144	>	}
145	>
146	>	// List of all supported video modes
147	>	extern vector<video_mode> VideoModes;
148	>
149	>	// Description for one (possibly virtual) monitor
150	>	struct monitor_desc {
151	>	uint32 mac_frame_base;  // Mac frame buffer address
152	>	video_mode mode;                // Currently selected video mode description
153		};
154
155	<	extern struct video_desc VideoMonitor;  // Description of the main monitor, set by VideoInit()
155	>	// Description of the main (and currently the only) monitor, set by VideoInit()
156	>	extern monitor_desc VideoMonitor;
157
158		extern int16 VideoDriverOpen(uint32 pb, uint32 dce);
159		extern int16 VideoDriverControl(uint32 pb, uint32 dce);
#	Line 54 | Line 166 | extern void VideoExit(void);
166		extern void VideoQuitFullScreen(void);
167
168		extern void VideoInterrupt(void);
169	+	extern void VideoRefresh(void);
170	+
171	+	// Called by the video driver to switch the video mode
172	+	extern void video_switch_to_mode(const video_mode &mode);
173	+
174	+	// Called by the video driver to set the color palette (in indexed modes)
175	+	// or gamma table (in direct modes)
176	+	extern void video_set_palette(uint8 *pal, int num);
177	+
178	+	// Check whether a mode with the specified depth exists
179	+	extern bool video_has_depth(video_depth depth);
180	+
181	+	// Get bytes-per-row value for specified resolution/depth
182	+	extern uint32 video_bytes_per_row(video_depth depth, uint32 id);
183
184	<	extern void video_set_palette(uint8 *pal);
184	>	// Initialize apple_mode_for_depth[] array from VideoModes list
185	>	extern void video_init_depth_list(void);
186
187		#endif

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