1 // license:BSD-3-Clause
2 // copyright-holders:Aaron Giles
3 /***************************************************************************
4
5 Atari Batman hardware
6
7 ****************************************************************************/
8
9 #include "emu.h"
10 #include "includes/batman.h"
11
12
13
14 /*************************************
15 *
16 * Tilemap callbacks
17 *
18 *************************************/
19
TILE_GET_INFO_MEMBER(batman_state::get_alpha_tile_info)20 TILE_GET_INFO_MEMBER(batman_state::get_alpha_tile_info)
21 {
22 uint16_t data = m_vad->alpha().basemem_read(tile_index);
23 int code = ((data & 0x400) ? (m_alpha_tile_bank * 0x400) : 0) + (data & 0x3ff);
24 int color = (data >> 11) & 0x0f;
25 int opaque = data & 0x8000;
26 tileinfo.set(2, code, color, opaque ? TILE_FORCE_LAYER0 : 0);
27 }
28
29
TILE_GET_INFO_MEMBER(batman_state::get_playfield_tile_info)30 TILE_GET_INFO_MEMBER(batman_state::get_playfield_tile_info)
31 {
32 uint16_t data1 = m_vad->playfield().basemem_read(tile_index);
33 uint16_t data2 = m_vad->playfield().extmem_read(tile_index) & 0xff;
34 int code = data1 & 0x7fff;
35 int color = 0x10 + (data2 & 0x0f);
36 tileinfo.set(0, code, color, (data1 >> 15) & 1);
37 tileinfo.category = (data2 >> 4) & 3;
38 }
39
40
TILE_GET_INFO_MEMBER(batman_state::get_playfield2_tile_info)41 TILE_GET_INFO_MEMBER(batman_state::get_playfield2_tile_info)
42 {
43 uint16_t data1 = m_vad->playfield2().basemem_read(tile_index);
44 uint16_t data2 = m_vad->playfield2().extmem_read(tile_index) >> 8;
45 int code = data1 & 0x7fff;
46 int color = data2 & 0x0f;
47 tileinfo.set(0, code, color, (data1 >> 15) & 1);
48 tileinfo.category = (data2 >> 4) & 3;
49 }
50
51
52
53 /*************************************
54 *
55 * Video system start
56 *
57 *************************************/
58
59 const atari_motion_objects_config batman_state::s_mob_config =
60 {
61 1, /* index to which gfx system */
62 1, /* number of motion object banks */
63 1, /* are the entries linked? */
64 0, /* are the entries split? */
65 1, /* render in reverse order? */
66 0, /* render in swapped X/Y order? */
67 0, /* does the neighbor bit affect the next object? */
68 8, /* pixels per SLIP entry (0 for no-slip) */
69 0, /* pixel offset for SLIPs */
70 0, /* maximum number of links to visit/scanline (0=all) */
71
72 0x100, /* base palette entry */
73 0x100, /* maximum number of colors */
74 0, /* transparent pen index */
75
76 {{ 0x03ff,0,0,0 }}, /* mask for the link */
77 {{ 0,0x7fff,0,0 }}, /* mask for the code index */
78 {{ 0,0,0x000f,0 }}, /* mask for the color */
79 {{ 0,0,0xff80,0 }}, /* mask for the X position */
80 {{ 0,0,0,0xff80 }}, /* mask for the Y position */
81 {{ 0,0,0,0x0070 }}, /* mask for the width, in tiles*/
82 {{ 0,0,0,0x0007 }}, /* mask for the height, in tiles */
83 {{ 0,0x8000,0,0 }}, /* mask for the horizontal flip */
84 {{ 0 }}, /* mask for the vertical flip */
85 {{ 0,0,0x0070,0 }}, /* mask for the priority */
86 {{ 0 }}, /* mask for the neighbor */
87 {{ 0 }}, /* mask for absolute coordinates */
88
89 {{ 0 }}, /* mask for the special value */
90 0, /* resulting value to indicate "special" */
91 };
92
93
94
95 /*************************************
96 *
97 * Main refresh
98 *
99 *************************************/
100
screen_update_batman(screen_device & screen,bitmap_ind16 & bitmap,const rectangle & cliprect)101 uint32_t batman_state::screen_update_batman(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
102 {
103 // start drawing
104 m_vad->mob().draw_async(cliprect);
105
106 /* draw the playfield */
107 bitmap_ind8 &priority_bitmap = screen.priority();
108 priority_bitmap.fill(0, cliprect);
109 m_vad->playfield().draw(screen, bitmap, cliprect, 0, 0x00);
110 m_vad->playfield().draw(screen, bitmap, cliprect, 1, 0x01);
111 m_vad->playfield().draw(screen, bitmap, cliprect, 2, 0x02);
112 m_vad->playfield().draw(screen, bitmap, cliprect, 3, 0x03);
113 m_vad->playfield2().draw(screen, bitmap, cliprect, 0, 0x80);
114 m_vad->playfield2().draw(screen, bitmap, cliprect, 1, 0x84);
115 m_vad->playfield2().draw(screen, bitmap, cliprect, 2, 0x88);
116 m_vad->playfield2().draw(screen, bitmap, cliprect, 3, 0x8c);
117
118 // draw and merge the MO
119 bitmap_ind16 &mobitmap = m_vad->mob().bitmap();
120 for (const sparse_dirty_rect *rect = m_vad->mob().first_dirty_rect(cliprect); rect != nullptr; rect = rect->next())
121 for (int y = rect->top(); y <= rect->bottom(); y++)
122 {
123 uint16_t const *const mo = &mobitmap.pix(y);
124 uint16_t *const pf = &bitmap.pix(y);
125 uint8_t const *const pri = &priority_bitmap.pix(y);
126 for (int x = rect->left(); x <= rect->right(); x++)
127 if (mo[x] != 0xffff)
128 {
129 /* verified on real hardware:
130
131 for all MO colors, MO priority 0:
132 obscured by low fg playfield pens priority 1-3
133 obscured by high fg playfield pens priority 3 only
134 obscured by bg playfield priority 3 only
135
136 for all MO colors, MO priority 1:
137 obscured by low fg playfield pens priority 2-3
138 obscured by high fg playfield pens priority 3 only
139 obscured by bg playfield priority 3 only
140
141 for all MO colors, MO priority 2-3:
142 obscured by low fg playfield pens priority 3 only
143 obscured by high fg playfield pens priority 3 only
144 obscured by bg playfield priority 3 only
145 */
146 int const mopriority = mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT;
147
148 /* upper bit of MO priority signals special rendering and doesn't draw anything */
149 if (mopriority & 4)
150 continue;
151
152 /* foreground playfield case */
153 if (pri[x] & 0x80)
154 {
155 int const pfpriority = (pri[x] >> 2) & 3;
156
157 /* playfield priority 3 always wins */
158 if (pfpriority == 3)
159 ;
160
161 /* priority is consistent for upper pens in playfield */
162 else if (pf[x] & 0x08)
163 pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK;
164
165 /* otherwise, we need to compare */
166 else if (mopriority >= pfpriority)
167 pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK;
168 }
169
170 /* background playfield case */
171 else
172 {
173 int const pfpriority = pri[x] & 3;
174
175 /* playfield priority 3 always wins */
176 if (pfpriority == 3)
177 ;
178
179 /* otherwise, MOs get shown */
180 else
181 pf[x] = mo[x] & atari_motion_objects_device::DATA_MASK;
182 }
183
184 /* don't erase yet -- we need to make another pass later */
185 }
186 }
187
188 /* add the alpha on top */
189 m_vad->alpha().draw(screen, bitmap, cliprect, 0, 0);
190
191 /* now go back and process the upper bit of MO priority */
192 for (const sparse_dirty_rect *rect = m_vad->mob().first_dirty_rect(cliprect); rect != nullptr; rect = rect->next())
193 for (int y = rect->top(); y <= rect->bottom(); y++)
194 {
195 uint16_t const *const mo = &mobitmap.pix(y);
196 uint16_t *const pf = &bitmap.pix(y);
197 for (int x = rect->left(); x <= rect->right(); x++)
198 if (mo[x] != 0xffff)
199 {
200 int const mopriority = mo[x] >> atari_motion_objects_device::PRIORITY_SHIFT;
201
202 /* upper bit of MO priority might mean palette kludges */
203 if (mopriority & 4)
204 {
205 /* if bit 2 is set, start setting high palette bits */
206 if (mo[x] & 2)
207 m_vad->mob().apply_stain(bitmap, pf, mo, x, y);
208 }
209 }
210 }
211 return 0;
212 }
213