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r12419 Sunday 31st July, 2011 at 17:56:11 UTC by Tim Schuerewegen
[CYBIKO] Fixed garbled graphics when running Prex OS. (nw)

[src/mess/video]

hd66421.c

src/mess/video/hd66421.c

r12418	r12419
58	58
59	59	typedef struct
60	60	{
61		UINT8 idx, dat[32]; // index and data registers
62		UINT8 *ram;         // display ram
63		UINT32 pos;         // current position in ram
	61	UINT8 cmd, reg[32];
	62	UINT8 *ram;
	63	int x, y;
64	64	} HD66421;
65	65
66	66	static HD66421 lcd;
r12418	r12419
68	68	UINT8 hd66421_reg_idx_r(void)
69	69	{
70	70	_logerror( 2, ("hd66421_reg_idx_r\n"));
71		return lcd.idx;
	71	return lcd.cmd;
72	72	}
73	73
74	74	void hd66421_reg_idx_w(UINT8 data)
75	75	{
76	76	_logerror( 2, ("hd66421_reg_idx_w (%02X)\n", data));
77		lcd.idx = data;
	77	lcd.cmd = data;
78	78	}
79	79
80	80	UINT8 hd66421_reg_dat_r(void)
81	81	{
82	82	_logerror( 2, ("hd66421_reg_dat_r\n"));
83		return lcd.dat[lcd.idx];
	83	return lcd.reg[lcd.cmd];
84	84	}
85	85
86	86	void hd66421_reg_dat_w(UINT8 data)
87	87	{
88	88	_logerror( 2, ("hd66421_reg_dat_w (%02X)\n", data));
89		lcd.dat[lcd.idx] = data;
90		switch (lcd.idx)
	89	lcd.reg[lcd.cmd] = data;
	90	switch (lcd.cmd)
91	91	{
92		case LCD_REG_ADDR_Y : lcd.pos = data * HD66421_WIDTH / 4; break;
93		case LCD_REG_RAM    : lcd.ram[lcd.pos++] = data; break;
	92	case LCD_REG_ADDR_X :
	93	{
	94	lcd.x = data;
	95	}
	96	break;
	97	case LCD_REG_ADDR_Y :
	98	{
	99	lcd.y = data;
	100	}
	101	break;
	102	case LCD_REG_RAM :
	103	{
	104	UINT8 r1;
	105	*(lcd.ram + lcd.y * (HD66421_WIDTH / 4) + lcd.x) = data;
	106	r1 = lcd.reg[LCD_REG_CONTROL_2];
	107	if (r1 & 0x02)
	108	{
	109	lcd.x++;
	110	}
	111	else
	112	{
	113	lcd.y++;
	114	}
	115	if (lcd.x >= (HD66421_WIDTH / 4))
	116	{
	117	lcd.x = 0;
	118	lcd.y++;
	119	}
	120	if (lcd.y >= HD66421_HEIGHT)
	121	{
	122	lcd.y = 0;
	123	}
	124	}
	125	break;
94	126	}
95	127	}
96	128
r12418	r12419
116	148	static void hd66421_state_save(running_machine &machine)
117	149	{
118	150	const char *name = "hd66421";
119		state_save_register_item(machine, name, NULL, 0, lcd.idx);
120		state_save_register_item_array(machine, name, NULL, 0, lcd.dat);
121		state_save_register_item(machine, name, NULL, 0, lcd.pos);
	151	state_save_register_item(machine, name, NULL, 0, lcd.cmd);
	152	state_save_register_item_array(machine, name, NULL, 0, lcd.reg);
	153	state_save_register_item(machine, name, NULL, 0, lcd.x);
	154	state_save_register_item(machine, name, NULL, 0, lcd.y);
122	155	state_save_register_item_pointer(machine, name, NULL, 0, lcd.ram, HD66421_RAM_SIZE);
123	156	}
124	157
r12418	r12419
140	173	{
141	174	double bright;
142	175	int temp;
143		temp = 31 - (lcd.dat[LCD_REG_COLOR_1+i] - lcd.dat[LCD_REG_CONTRAST] + 0x03);
	176	temp = 31 - (lcd.reg[LCD_REG_COLOR_1+i] - lcd.reg[LCD_REG_CONTRAST] + 0x03);
144	177	if (temp <  0) temp =  0;
145	178	if (temp > 31) temp = 31;
146	179	bright = 1.0 * temp / 31;
r12418	r12419
152	185	#endif
153	186	}
154	187	// draw bitmap (bottom to top)
155		if (lcd.dat[0] & LCD_R0_DISP)
	188	if (lcd.reg[0] & LCD_R0_DISP)
156	189	{
157	190	int x, y;
158	191	x = 0;

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