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r6480 Sunday 29th November, 2009 at 14:25:55 UTC by Robbbert
[ADVISION] Improved the video display.

[src/mess/drivers]	advision.c
[src/mess/video]	advision.c

src/mess/video/advision.c

r6479	r6480
5	5	Routines to control the Adventurevision video hardware
6	6
7	7	Video hardware is composed of a vertical array of 40 LEDs which is
8		reflected off a spinning mirror.
	8	reflected off a spinning mirror, to give a resolution of 150 x 40 at 15 FPS.
9	9
10	10	***************************************************************************/
11	11
r6479	r6480
21	21	{
22	22	advision_state *state = machine->driver_data;
23	23
24		state->video_hpos = 0;
	24	state->video_hpos = 0;
25	25	state->display = auto_alloc_array(machine, UINT8, 8 * 8 * 256);
26	26	memset(state->display, 0, 8 * 8 * 256);
27	27	}
28	28
29	29	/***************************************************************************
30	30
31		Stop the video hardware emulation.
	31	Initialise the palette.
32	32
33	33	***************************************************************************/
34	34
r6479	r6480
43	43	}
44	44	}
45	45
	46	/***************************************************************************
	47
	48	Update the display data.
	49
	50	***************************************************************************/
	51
46	52	void advision_vh_write(running_machine *machine, int data)
47	53	{
48	54	advision_state *state = machine->driver_data;
r6479	r6480
57	63	{
58	64	advision_state *state = machine->driver_data;
59	65
60		UINT8 *dst = &state->display[x];
	66	UINT8 *dst = &state->display[x];
61	67	int y;
62	68
63	69	for( y = 0; y < 8; y++ )
r6479	r6480
76	82	state->led_latch[7-y] = 0xff;
77	83
78	84	dst += 8 * 256;
79		}
	85	}
80	86	}
81	87
82	88
r6479	r6480
90	96	{
91	97	advision_state *state = screen->machine->driver_data;
92	98
93		int x, y, bit;
	99	int x, y;
94	100
95		static int framecount = 0;
	101	static int framecount = 0;
96	102
97		if( (framecount++ % 8) == 0 )
	103	if( (framecount++ % 4) == 0 )
98	104	{
99	105	state->frame_start = 1;
100	106	state->video_hpos = 0;
101		}
	107	}
102	108
103		for( x = (framecount % 2) * 128; x < (framecount % 2) * 128+128; x++ )
	109	for (x = 0; x < 150; x++)
104	110	{
105	111	UINT8 *led = &state->display[x];
106	112
107		for( y = 0; y < 8; y++ )
	113	for( y = 0; y < 128; y+=2 )
108	114	{
109		for( bit = 0; bit < 8; bit++ )
110		{
111		if( *led > 0 )
112		*BITMAP_ADDR16(bitmap, 30 + 2 *( y * 8 + bit), 85 + x) = --(*led);
	115	if( *led > 0 )
	116	*BITMAP_ADDR16(bitmap, 30 + y, 85 + x) = --(*led);
	117	else
	118	*BITMAP_ADDR16(bitmap, 30 + y, 85 + x) = 0;
113	119
114		led += 256;
115		}
	120	led += 256;
116	121	}
117	122	}
118	123	return 0;

src/mess/drivers/advision.c

r6479	r6480
85	85
86	86	/* video hardware */
87	87	MDRV_SCREEN_ADD(SCREEN_TAG, RASTER)
88		MDRV_SCREEN_REFRESH_RATE(8*15)
	88	MDRV_SCREEN_REFRESH_RATE(4*15)
89	89	MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
90	90	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
91	91	MDRV_SCREEN_SIZE(320, 200)

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