summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/tp84.c
blob: 80b3d00a95f661e6c23ec6006c6d11434645e358 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
// license:???
// copyright-holders:Marc Lafontaine
/***************************************************************************

    video.c

    Functions to emulate the video hardware of the machine.

***************************************************************************/

#include "emu.h"
#include "video/resnet.h"
#include "includes/tp84.h"





/*
-The colortable is divided in 2 part:
 -The characters colors
 -The sprites colors

-The characters colors are indexed like this:
 -2 bits from the characters
 -4 bits from the attribute in tp84_bg_colorram
 -2 bits from palette_bank (d3-d4)
 -3 bits from palette_bank (d0-d1-d2)
-So, there is 2048 bytes for the characters

-The sprites colors are indexed like this:
 -4 bits from the sprites (16 colors)
 -4 bits from the attribute of the sprites
 -3 bits from palette_bank (d0-d1-d2)
-So, there is 2048 bytes for the sprites

*/
/*
     The RGB signals are generated by 3 proms 256X4 (prom 2C, 2D and 1E)
        The resistors values are:
            1K  ohm
            470 ohm
            220 ohm
            100 ohm
*/
PALETTE_INIT_MEMBER(tp84_state, tp84)
{
	const UINT8 *color_prom = memregion("proms")->base();
	static const int resistances[4] = { 1000, 470, 220, 100 };
	double weights[4];
	int i;

	/* compute the color output resistor weights */
	compute_resistor_weights(0, 255, -1.0,
			4, resistances, weights, 470, 0,
			0, 0, 0, 0, 0,
			0, 0, 0, 0, 0);

	/* create a lookup table for the palette */
	for (i = 0; i < 0x100; i++)
	{
		int bit0, bit1, bit2, bit3;
		int r, g, b;

		/* red component */
		bit0 = (color_prom[i + 0x000] >> 0) & 0x01;
		bit1 = (color_prom[i + 0x000] >> 1) & 0x01;
		bit2 = (color_prom[i + 0x000] >> 2) & 0x01;
		bit3 = (color_prom[i + 0x000] >> 3) & 0x01;
		r = combine_4_weights(weights, bit0, bit1, bit2, bit3);

		/* green component */
		bit0 = (color_prom[i + 0x100] >> 0) & 0x01;
		bit1 = (color_prom[i + 0x100] >> 1) & 0x01;
		bit2 = (color_prom[i + 0x100] >> 2) & 0x01;
		bit3 = (color_prom[i + 0x100] >> 3) & 0x01;
		g = combine_4_weights(weights, bit0, bit1, bit2, bit3);

		/* blue component */
		bit0 = (color_prom[i + 0x200] >> 0) & 0x01;
		bit1 = (color_prom[i + 0x200] >> 1) & 0x01;
		bit2 = (color_prom[i + 0x200] >> 2) & 0x01;
		bit3 = (color_prom[i + 0x200] >> 3) & 0x01;
		b = combine_4_weights(weights, bit0, bit1, bit2, bit3);

		palette.set_indirect_color(i, rgb_t(r, g, b));
	}

	/* color_prom now points to the beginning of the lookup table */
	color_prom += 0x300;

	/* characters use colors 0x80-0xff, sprites use colors 0-0x7f */
	for (i = 0; i < 0x200; i++)
	{
		int j;

		for (j = 0; j < 8; j++)
		{
			UINT8 ctabentry = ((~i & 0x100) >> 1) | (j << 4) | (color_prom[i] & 0x0f);
			palette.set_pen_indirect(((i & 0x100) << 3) | (j << 8) | (i & 0xff), ctabentry);
		}
	}
}


WRITE8_MEMBER(tp84_state::tp84_spriteram_w)
{
	/* the game multiplexes the sprites, so update now */
//  m_screen->update_now();
	m_screen->update_partial(m_screen->vpos());
	m_spriteram[offset] = data;
}


READ8_MEMBER(tp84_state::tp84_scanline_r)
{
	/* reads 1V - 128V */
	return m_screen->vpos();
}


TILE_GET_INFO_MEMBER(tp84_state::get_bg_tile_info)
{
	int code = ((m_bg_colorram[tile_index] & 0x30) << 4) | m_bg_videoram[tile_index];
	int color = ((*m_palette_bank & 0x07) << 6) |
				((*m_palette_bank & 0x18) << 1) |
				(m_bg_colorram[tile_index] & 0x0f);
	int flags = TILE_FLIPYX(m_bg_colorram[tile_index] >> 6);

	SET_TILE_INFO_MEMBER(0, code, color, flags);
}

TILE_GET_INFO_MEMBER(tp84_state::get_fg_tile_info)
{
	int code = ((m_fg_colorram[tile_index] & 0x30) << 4) | m_fg_videoram[tile_index];
	int color = ((*m_palette_bank & 0x07) << 6) |
				((*m_palette_bank & 0x18) << 1) |
				(m_fg_colorram[tile_index] & 0x0f);
	int flags = TILE_FLIPYX(m_fg_colorram[tile_index] >> 6);

	SET_TILE_INFO_MEMBER(0, code, color, flags);
}


void tp84_state::video_start()
{
	m_bg_tilemap = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(tp84_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
	m_fg_tilemap = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(tp84_state::get_fg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
}


void tp84_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	int offs;
	int palette_base = ((*m_palette_bank & 0x07) << 4);

	for (offs = 0x5c; offs >= 0; offs -= 4)
	{
		int x = m_spriteram[offs];
		int y = 240 - m_spriteram[offs + 3];

		int code = m_spriteram[offs + 1];
		int color = palette_base | (m_spriteram[offs + 2] & 0x0f);
		int flip_x = ~m_spriteram[offs + 2] & 0x40;
		int flip_y =  m_spriteram[offs + 2] & 0x80;

		m_gfxdecode->gfx(1)->transmask(bitmap,cliprect, code, color, flip_x, flip_y, x, y,
				m_palette->transpen_mask(*m_gfxdecode->gfx(1), color, palette_base));

	}
}


UINT32 tp84_state::screen_update_tp84(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	rectangle clip = cliprect;
	const rectangle &visarea = screen.visible_area();

	if (cliprect.min_y == screen.visible_area().min_y)
	{
		machine().tilemap().mark_all_dirty();

		m_bg_tilemap->set_scrollx(0, *m_scroll_x);
		m_bg_tilemap->set_scrolly(0, *m_scroll_y);

		machine().tilemap().set_flip_all(((*m_flipscreen_x & 0x01) ? TILEMAP_FLIPX : 0) |
										((*m_flipscreen_y & 0x01) ? TILEMAP_FLIPY : 0));
	}

	m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
	draw_sprites(bitmap, cliprect);

	/* draw top status region */
	clip.min_x = visarea.min_x;
	clip.max_x = visarea.min_x + 15;
	m_fg_tilemap->draw(screen, bitmap, clip, 0, 0);

	/* draw bottom status region */
	clip.min_x = visarea.max_x - 15;
	clip.max_x = visarea.max_x;
	m_fg_tilemap->draw(screen, bitmap, clip, 0, 0);

	return 0;
}