summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/tecmo_mix.cpp
blob: abcdbca401777280884ca305c6c40badea883b1f (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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
// license:BSD-3-Clause
// copyright-holders:David Haywood

#include "emu.h"
#include "tecmo_mix.h"


DEFINE_DEVICE_TYPE(TECMO_MIXER, tecmo_mix_device, "tecmo_mix", "Tecmo 16-bit Mixer")

tecmo_mix_device::tecmo_mix_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, TECMO_MIXER, tag, owner, clock),
		device_video_interface(mconfig, *this),
		m_sprpri_shift(0),
		m_sprbln_shift(0),
		m_sprcol_shift(0),

		m_spblend_source(0),
		m_fgblend_source(0),

		m_bgblend_comp(0),
		m_fgblend_comp(0),
		m_txblend_comp(0),
		m_spblend_comp(0),

		m_bgregular_comp(0),
		m_fgregular_comp(0),
		m_txregular_comp(0),
		m_spregular_comp(0),

		m_bgpen(0),
		m_bgpen_blend(0),

		m_revspritetile(0)

{
}


void tecmo_mix_device::device_start()
{
}

void tecmo_mix_device::device_reset()
{
}

uint32_t tecmo_mix_device::sum_colors(const pen_t *pal, int c1_idx, int c2_idx)
{
	const pen_t c1 = pal[c1_idx];
	const pen_t c2 = pal[c2_idx];

	const int c1_a = (c1 >> 24) & 0xFF;
	const int c1_r = (c1 >> 16) & 0xFF;
	const int c1_g = (c1 >> 8)  & 0xFF;
	const int c1_b = c1 & 0xFF;

	const int c2_a = (c2 >> 24) & 0xFF;
	const int c2_r = (c2 >> 16) & 0xFF;
	const int c2_g = (c2 >> 8)  & 0xFF;
	const int c2_b = c2 & 0xFF;

	const uint8_t a = (std::min)(0xFF, c1_a + c2_a);
	const uint8_t r = (std::min)(0xFF, c1_r + c2_r);
	const uint8_t g = (std::min)(0xFF, c1_g + c2_g);
	const uint8_t b = (std::min)(0xFF, c1_b + c2_b);

	return ((a << 24) | (r << 16) | (g << 8) | b);
}

void tecmo_mix_device::mix_bitmaps(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect, palette_device &palette, bitmap_ind16* bitmap_bg, bitmap_ind16* bitmap_fg, bitmap_ind16* bitmap_tx, bitmap_ind16* bitmap_sp)
{
	//int frame = (screen.frame_number()) & 1;
	// note this game has no tx layer, comments relate to other drivers

	int y, x;
	const pen_t *paldata = palette.pens();

	for (y = cliprect.min_y; y <= cliprect.max_y; y++)
	{
		uint32_t *dd = &bitmap.pix32(y);
		uint16_t *sd2 = &bitmap_sp->pix16(y);
		uint16_t *fg = &bitmap_fg->pix16(y);
		uint16_t *bg = &bitmap_bg->pix16(y);
		uint16_t *tx = nullptr;
		if (bitmap_tx != nullptr)
			tx = &bitmap_tx->pix16(y);

		for (x = cliprect.min_x; x <= cliprect.max_x; x++)
		{
			uint16_t sprpixel = (sd2[x]);

			uint16_t m_sprpri = (sprpixel >> m_sprpri_shift) & 0x3;
			uint16_t m_sprbln = (sprpixel >> m_sprbln_shift) & 0x1;
			uint16_t m_sprcol = (sprpixel >> m_sprcol_shift) & 0xf;

			sprpixel = (sprpixel & 0xf) | (m_sprcol << 4);

			//sprpixel &= 0xff;

			uint16_t fgpixel = (fg[x]);
			uint16_t fgbln = (fgpixel & 0x0100) >> 8;
			fgpixel &= 0xff;

			uint16_t bgpixel = (bg[x]);
			bgpixel &= 0xff;

			uint16_t txpixel = (bitmap_tx != nullptr) ? (tx[x]) : 0;
			txpixel &= 0xff;

			if (sprpixel&0xf)
			{
				if (m_sprpri == (0 ^ m_revspritetile)) // behind all
				{
					if (txpixel & 0xf)
					{
						// solid TX
						dd[x] = paldata[txpixel + m_txregular_comp];
					}
					else if (fgpixel & 0xf) // is the fg used?
					{
						if (fgbln)
						{
							dd[x] = machine().rand();
						}
						else
						{
							// solid FG
							dd[x] = paldata[fgpixel + m_fgregular_comp];
						}
					}
					else if (bgpixel & 0xf)
					{
						// solid BG
						dd[x] = paldata[bgpixel + m_bgregular_comp];
					}
					else
					{
						if (m_sprbln)
						{ // sprite is blended with bgpen?
							dd[x] = machine().rand();
						}
						else
						{
							// solid sprite
							dd[x] = paldata[sprpixel + m_spregular_comp];
						}
					}
				}
				else  if (m_sprpri == (1 ^ m_revspritetile)) // above bg, behind tx, fg
				{
					if (txpixel & 0xf)
					{
						// solid TX
						dd[x] = paldata[txpixel + m_txregular_comp];
					}
					else if (fgpixel & 0xf) // is the fg used?
					{
						if (fgbln)
						{
							if (m_sprbln)
							{
								// needs if bgpixel & 0xf check?

								// fg is used and blended with sprite, sprite is used and blended with bg?  -- used on 'trail' of ball when ball is under the transparent area
								dd[x] = sum_colors(paldata, bgpixel + m_bgblend_comp, sprpixel + m_spblend_source); // WRONG??
							}
							else
							{
								// fg is used and blended with opaque sprite
								dd[x] = sum_colors(paldata, fgpixel + m_fgblend_source, sprpixel + m_spblend_comp);
							}
						}
						else
						{
							// fg is used and opaque
							dd[x] = paldata[fgpixel + m_fgregular_comp];
						}
					}
					else
					{
						if (m_sprbln)
						{
							if (bgpixel & 0xf)
							{
								//fg isn't used, sprite is used and blended with bg? -- used on trail of ball / flippers (looks odd)  -- some ninja gaiden enemy deaths (when behind fg) (looks ok?)  (maybe we need to check for colour saturation?)
								dd[x] = sum_colors(paldata, bgpixel + m_bgblend_comp, sprpixel + m_spblend_source);
							}
							else
							{
								//fg isn't used, sprite is used and blended with bg? -- used on trail of ball / flippers (looks odd)  -- some ninja gaiden enemy deaths (when behind fg) (looks ok?)  (maybe we need to check for colour saturation?)
								dd[x] = sum_colors(paldata, m_bgpen_blend, sprpixel + m_spblend_source);
							}
						}
						else
						{
							// fg isn't used, sprite is used and is opaque
							dd[x] = paldata[sprpixel + m_spregular_comp];
						}
					}
				}
				else if (m_sprpri == (2 ^ m_revspritetile)) // above bg,fg, behind tx
				{
					if (txpixel & 0xf)
					{
						// solid TX
						dd[x] = paldata[txpixel + m_txregular_comp];
					}
					else
					{
						if (m_sprbln)
						{
							if (fgpixel & 0xf) // is the fg used?
							{
								if (fgbln)
								{
									// blended sprite over blended fg pixel?
									dd[x] = machine().rand();
								}
								else
								{
									// blended sprite over solid fgpixel?
									dd[x] = sum_colors(paldata, fgpixel + m_fgblend_comp, sprpixel + m_spblend_source);
								}
							}
							else if (bgpixel & 0xf)
							{
								// blended sprite over solid bg pixel
								dd[x] = sum_colors(paldata, bgpixel + m_bgblend_comp, sprpixel + m_spblend_source);
								//  dd[x] = machine().rand();
							}
							else
							{
								// blended sprite over solid bg pixel
								dd[x] = sum_colors(paldata, m_bgpen_blend, sprpixel + m_spblend_source);
								//  dd[x] = machine().rand();
							}
						}
						else
						{
							dd[x] = paldata[sprpixel + m_spregular_comp];
							//dd[x] = machine().rand();
							// the bad tiles on the wildfang map (shown between levels) are drawn here.. why? looks like they should be transparent?
							// most wildfang sprites use this and are fine, so what's going wrong?
						}
					}
				}

				else if (m_sprpri == (3 ^ m_revspritetile)) // above all?
				{
					if (m_sprbln)
					{
						// unusued by this game?
						//dd[x] = machine().rand();
						if (txpixel & 0xf)
						{
							// blended sprite over solid txpixel?
							dd[x] = sum_colors(paldata, txpixel + m_txblend_comp, sprpixel + m_spblend_source);
						}
						else if (fgpixel & 0xf) // is the fg used?
						{
							if (fgbln)
							{
								// blended sprite over blended fg pixel?
								dd[x] = machine().rand();
							}
							else
							{
								// blended sprite over solid fgpixel?
								dd[x] = sum_colors(paldata, fgpixel + m_fgblend_comp, sprpixel + m_spblend_source);
							}
						}
						else if (bgpixel & 0xf)
						{
							// blended sprite over solid bg pixel
							dd[x] = sum_colors(paldata, bgpixel + m_bgblend_comp, sprpixel + m_spblend_source);
						}
						else
						{
							// blended sprite over solid bg pixel
							dd[x] = sum_colors(paldata, m_bgpen_blend, sprpixel + m_spblend_source);
						}
					}
					else
					{
						dd[x] = paldata[sprpixel + m_spregular_comp];
					}

				}
			}
			else // NON SPRITE CASES
			{
				if (txpixel & 0xf)
				{
					// solid TX
					dd[x] = paldata[txpixel + m_txregular_comp];
				}
				else if (fgpixel & 0xf)
				{
					if (fgbln)
					{
						if (bgpixel & 0xf)
						{
							dd[x] = sum_colors(paldata, fgpixel + m_fgblend_source, bgpixel + m_bgblend_comp);
						}
						else
						{
							dd[x] = sum_colors(paldata, fgpixel + m_fgblend_source, m_bgpen_blend);
						}
					}
					else
					{
						dd[x] = paldata[fgpixel + m_fgregular_comp];
					}
				}
				else if (bgpixel & 0xf)
				{
					dd[x] = paldata[bgpixel + m_bgregular_comp];
				}
				else
				{
					dd[x] = paldata[m_bgpen];// pen 0x200 on raiga  0xb00 on spbactn
				}
			}
		}
	}
}