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r7906 Tuesday 27th April, 2010 at 07:59:23 UTC by Curt Coder
[CGC7900] Fixed display overlay.

[src/mess/drivers]	cgc7900.c
[src/mess/includes]	cgc7900.h
[src/mess/video]	cgc7900.c

src/mess/video/cgc7900.c

r7905	r7906
39	39	}
40	40	}
41	41
42		#define OVERLAY_CUR      0x80000000   /* places a cursor in the cell if SET */
43		#define OVERLAY_BLK      0x40000000   /* blinks the foreground character in the cell if SET */
44		#define OVERLAY_VF      0x10000000   /* makes the foreground visible if SET (else transparent) */
45		#define OVERLAY_VB      0x08000000   /* makes the background visible if SET (else transparent) */
46		#define OVERLAY_PL      0x01000000   /* uses bits 0-7 as PLOT DOT descriptor if SET (else ASCII) */
47		#define OVERLAY_BR      0x00040000   /* turns on Red in background if SET */
48		#define OVERLAY_BG      0x00020000   /* turns on Green in background if SET */
49		#define OVERLAY_BB      0x00010000   /* turns on Blue in background if SET */
50		#define OVERLAY_FR      0x00000400   /* turns on Red in foreground if SET */
51		#define OVERLAY_FG      0x00000200   /* turns on Green in foreground if SET */
52		#define OVERLAY_FB      0x00000100   /* turns on Blue in background if SET */
	42	#define OVERLAY_CUR      BIT(cell, 31)   /* places a cursor in the cell if SET */
	43	#define OVERLAY_BLK      BIT(cell, 30)   /* blinks the foreground character in the cell if SET */
	44	#define OVERLAY_VF      BIT(cell, 28)   /* makes the foreground visible if SET (else transparent) */
	45	#define OVERLAY_VB      BIT(cell, 27)   /* makes the background visible if SET (else transparent) */
	46	#define OVERLAY_PL      BIT(cell, 24)   /* uses bits 0-7 as PLOT DOT descriptor if SET (else ASCII) */
	47	#define OVERLAY_BR      BIT(cell, 18)   /* turns on Red in background if SET */
	48	#define OVERLAY_BG      BIT(cell, 17)   /* turns on Green in background if SET */
	49	#define OVERLAY_BB      BIT(cell, 16)   /* turns on Blue in background if SET */
	50	#define OVERLAY_FR      BIT(cell, 10)   /* turns on Red in foreground if SET */
	51	#define OVERLAY_FG      BIT(cell, 9)   /* turns on Green in foreground if SET */
	52	#define OVERLAY_FB      BIT(cell, 8)   /* turns on Blue in background if SET */
	53	#define OVERLAY_DATA   (cell & 0xff)   /* ASCII or Plot Dot character */
53	54
54	55	static void draw_overlay(running_device *screen, bitmap_t *bitmap)
55	56	{
r7905	r7906
58	59	for (int y = 0; y < 768; y++)
59	60	{
60	61	int sy = y / 8;
	62	int line = y % 8;
61	63
62	64	for (int sx = 0; sx < 85; sx++)
63	65	{
64		UINT16 addr = (sy * 85) + sx;
65		UINT32 cell = (state->overlay_ram[addr + 1] << 16) | state->overlay_ram[addr];
66		UINT8 data = state->char_rom[(cell & 0xff) << 3];
	66	UINT16 addr = (sy * 170) + (sx * 2);
	67	UINT32 cell = (state->overlay_ram[addr] << 16) | state->overlay_ram[addr + 1];
	68	UINT8 data = state->char_rom[(OVERLAY_DATA << 3) | line];
67	69	int fg = (cell >> 8) & 0x07;
68	70	int bg = (cell >> 16) & 0x07;
69	71
70	72	for (int x = 0; x < 8; x++)
71	73	{
72		*BITMAP_ADDR16(bitmap, y, (sx * 8) + x) = BIT(data, 7) ? fg : bg;
73		data <<= 1;
	74	if (OVERLAY_CUR)
	75	{
	76	*BITMAP_ADDR16(bitmap, y, (sx * 8) + x) = 7;
	77	}
	78	else
	79	{
	80	if (BIT(data, x))
	81	{
	82	if (OVERLAY_VF) *BITMAP_ADDR16(bitmap, y, (sx * 8) + x) = fg;
	83	}
	84	else
	85	{
	86	if (OVERLAY_VB) *BITMAP_ADDR16(bitmap, y, (sx * 8) + x) = bg;
	87	}
	88	}
74	89	}
75
76		addr += 2;
77	90	}
78	91	}
79	92	}

src/mess/includes/cgc7900.h

r7905	r7906
18	18	cgc7900_state(running_machine &machine) { }
19	19
20	20	/* video state */
21		UINT16 *z_ram;
22	21	UINT16 *plane_ram;
23	22	UINT16 *clut_ram;
24	23	UINT16 *overlay_ram;

src/mess/drivers/cgc7900.c

r7905	r7906
20	20	ADDRESS_MAP_UNMAP_HIGH
21	21	AM_RANGE(0x000000, 0x7fffff) AM_RAM AM_BASE(&chrom_ram) // 16 * Buffer card memory
22	22	AM_RANGE(0x800000, 0x80ffff) AM_ROM AM_REGION(M68000_TAG, 0)
23		AM_RANGE(0xa00000, 0xbfffff) AM_RAM AM_BASE_MEMBER(cgc7900_state, z_ram)
	23	//   AM_RANGE(0xa00000, 0xbfffff) AM_READWRITE(z_mode_r, z_mode_w)
24	24	AM_RANGE(0xc00000, 0xdfffff) AM_RAM AM_BASE_MEMBER(cgc7900_state, plane_ram)
25	25	//   AM_RANGE(0xe00000, 0xe1ffff) AM_WRITE(color_status_w)
26	26	//   AM_RANGE(0xe20000, 0xe23fff) Raster Processor
r7905	r7906
76	76	static INPUT_PORTS_START( cgc7900 )
77	77	INPUT_PORTS_END
78	78
	79	static MACHINE_START( cgc7900 )
	80	{
	81	cgc7900_state *state = (cgc7900_state *)machine->driver_data;
79	82
	83	/* register for state saving */
	84	state_save_register_global_pointer(machine, state->overlay_ram, 0x4000);
	85	}
	86
80	87	static MACHINE_RESET(cgc7900)
81	88	{
82	89	UINT8* user1 = memory_region(machine, M68000_TAG);
83	90
84	91	memcpy((UINT8*)chrom_ram,user1,0x10000);
85	92
86		devtag_get_device(machine, M68000_TAG)->reset();
	93	devtag_get_device(machine, M68000_TAG)->reset();
87	94	}
88	95
89	96
r7905	r7906
118	125	MDRV_CPU_ADD(M68000_TAG, M68000, XTAL_8MHz)
119	126	MDRV_CPU_PROGRAM_MAP(cgc7900_mem)
120	127
	128	MDRV_MACHINE_START(cgc7900)
121	129	MDRV_MACHINE_RESET(cgc7900)
122	130
123	131	/* video hardware */

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