summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/x1.cpp
blob: 69bc60cc4fa2ca4faa7b083e35cd82dc7b66540f (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
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
// license:LGPL-2.1+
// copyright-holders:Angelo Salese, Barry Rodewald
/****************************************************************************
 *
 * Sharp X1 Video functions
 *
 * TODO:
 * - make this to be scanline renderer, fix palette partial updates;
 * - take mc6845 device functions into account;
 *
 ***************************************************************************/

#include "emu.h"
#include "includes/x1.h"

/*************************************
 *
 *  Video Functions
 *
 *************************************/

void x1_state::video_start()
{
	m_gfx_bitmap_ram = make_unique_clear<uint8_t[]>(0xc000*2);
	m_bitmapbank->configure_entries(0, 2, m_gfx_bitmap_ram.get(), 0xc000);
	m_bitmapbank->set_entry(0);
	m_pal_4096 = make_unique_clear<uint8_t[]>(0x1000*3);
}

void x1_state::x1_draw_pixel(bitmap_rgb32 &bitmap,int y,int x,uint16_t pen,uint8_t width,uint8_t height)
{
	if(!m_screen->visible_area().contains(x, y))
		return;

	if(width && height)
	{
		bitmap.pix32(y+0+m_ystart, x+0+m_xstart) = m_palette->pen(pen);
		bitmap.pix32(y+0+m_ystart, x+1+m_xstart) = m_palette->pen(pen);
		bitmap.pix32(y+1+m_ystart, x+0+m_xstart) = m_palette->pen(pen);
		bitmap.pix32(y+1+m_ystart, x+1+m_xstart) = m_palette->pen(pen);
	}
	else if(width)
	{
		bitmap.pix32(y+m_ystart, x+0+m_xstart) = m_palette->pen(pen);
		bitmap.pix32(y+m_ystart, x+1+m_xstart) = m_palette->pen(pen);
	}
	else if(height)
	{
		bitmap.pix32(y+0+m_ystart, x+m_xstart) = m_palette->pen(pen);
		bitmap.pix32(y+1+m_ystart, x+m_xstart) = m_palette->pen(pen);
	}
	else
		bitmap.pix32(y+m_ystart, x+m_xstart) = m_palette->pen(pen);
}

#define mc6845_h_char_total     (m_crtc_vreg[0])
#define mc6845_h_display        (m_crtc_vreg[1])
#define mc6845_h_sync_pos       (m_crtc_vreg[2])
#define mc6845_sync_width       (m_crtc_vreg[3])
#define mc6845_v_char_total     (m_crtc_vreg[4])
#define mc6845_v_total_adj      (m_crtc_vreg[5])
#define mc6845_v_display        (m_crtc_vreg[6])
#define mc6845_v_sync_pos       (m_crtc_vreg[7])
#define mc6845_mode_ctrl        (m_crtc_vreg[8])
#define mc6845_tile_height      (m_crtc_vreg[9]+1)
#define mc6845_cursor_y_start   (m_crtc_vreg[0x0a])
#define mc6845_cursor_y_end     (m_crtc_vreg[0x0b])
#define mc6845_start_addr       (((m_crtc_vreg[0x0c]<<8) & 0x3f00) | (m_crtc_vreg[0x0d] & 0xff))
#define mc6845_cursor_addr      (((m_crtc_vreg[0x0e]<<8) & 0x3f00) | (m_crtc_vreg[0x0f] & 0xff))
#define mc6845_light_pen_addr   (((m_crtc_vreg[0x10]<<8) & 0x3f00) | (m_crtc_vreg[0x11] & 0xff))
#define mc6845_update_addr      (((m_crtc_vreg[0x12]<<8) & 0x3f00) | (m_crtc_vreg[0x13] & 0xff))


/* adjust tile index when we are under double height condition */
uint8_t x1_state::check_prev_height(int x,int y,int x_size)
{
	uint8_t prev_tile = m_tvram[(x+((y-1)*x_size)+mc6845_start_addr) & 0x7ff];
	uint8_t cur_tile = m_tvram[(x+(y*x_size)+mc6845_start_addr) & 0x7ff];
	uint8_t prev_attr = m_avram[(x+((y-1)*x_size)+mc6845_start_addr) & 0x7ff];
	uint8_t cur_attr = m_avram[(x+(y*x_size)+mc6845_start_addr) & 0x7ff];

	if(prev_tile == cur_tile && prev_attr == cur_attr)
		return 8;

	return 0;
}

/* Exoa II - Warroid: if double height isn't enabled on the first tile of the line then double height is disabled on everything else. */
uint8_t x1_state::check_line_valid_height(int y,int x_size,int height)
{
	uint8_t line_attr = m_avram[(0+(y*x_size)+mc6845_start_addr) & 0x7ff];

	if((line_attr & 0x40) == 0)
		return 0;

	return height;
}

void x1_state::draw_fgtilemap(bitmap_rgb32 &bitmap,const rectangle &cliprect)
{
	/*
	    attribute table:
	    x--- ---- double width
	    -x-- ---- double height
	    --x- ---- PCG select
	    ---x ---- color blinking
	    ---- x--- reverse color
	    ---- -xxx color pen

	    x--- ---- select Kanji ROM
	    -x-- ---- Kanji side (0=left, 1=right)
	    --x- ---- Underline
	    ---x ---- Kanji ROM select (0=level 1, 1=level 2) (TODO: implement this)
	    ---- xxxx Kanji upper 4 bits
	*/

	int y,x,res_x,res_y;
	uint32_t tile_offset;
	uint8_t x_size,y_size;

	x_size = mc6845_h_display;
	y_size = mc6845_v_display;

	if(x_size == 0 || y_size == 0)
		return; //don't bother if screen is off

	if(x_size != 80 && x_size != 40 && y_size != 25)
		popmessage("%d %d",x_size,y_size);

	for (y=0;y<y_size;y++)
	{
		for (x=0;x<x_size;x++)
		{
			int tile = m_tvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff];
			int color = m_avram[((x+y*x_size)+mc6845_start_addr) & 0x7ff] & 0x1f;
			int width = BIT(m_avram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 7);
			int height = BIT(m_avram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 6);
			int pcg_bank = BIT(m_avram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 5);
			uint8_t *gfx_data = pcg_bank ? m_pcg_ram.get() : m_cg_rom; //machine.root_device().memregion(pcg_bank ? "pcg" : "cgrom")->base();
			int knj_enable = 0;
			int knj_side = 0;
			int knj_bank = 0;
			int knj_uline = 0;
			if(m_is_turbo)
			{
				knj_enable = BIT(m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 7);
				knj_side = BIT(m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 6);
				knj_uline = BIT(m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 5);
				//knj_lv2 = BIT(m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 4);
				knj_bank = m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff] & 0x0f;
				if(knj_enable)
				{
					gfx_data = m_kanji_rom;
					tile = ((tile + (knj_bank << 8)) << 1) + (knj_side & 1);
				}
			}

			{
				int pen[3],pen_mask,pcg_pen,xi,yi,dy;

				pen_mask = color & 7;

				dy = 0;

				height = check_line_valid_height(y,x_size,height);

				if(height && y)
					dy = check_prev_height(x,y,x_size);

				/* guess: assume that Kanji VRAM doesn't double the vertical size */
				if(knj_enable) { height = 0; }

				for(yi=0;yi<mc6845_tile_height;yi++)
				{
					for(xi=0;xi<8;xi++)
					{
						if(knj_enable) //kanji select
						{
							tile_offset  = tile * 16;
							tile_offset += (yi+dy*(m_scrn_reg.v400_mode+1)) >> (height+m_scrn_reg.v400_mode);
							pen[0] = gfx_data[tile_offset+0x0000]>>(7-xi) & (pen_mask & 1)>>0;
							pen[1] = gfx_data[tile_offset+0x0000]>>(7-xi) & (pen_mask & 2)>>1;
							pen[2] = gfx_data[tile_offset+0x0000]>>(7-xi) & (pen_mask & 4)>>2;

							if(yi == mc6845_tile_height-1 && knj_uline) //underlined attribute
							{
								pen[0] = (pen_mask & 1)>>0;
								pen[1] = (pen_mask & 2)>>1;
								pen[2] = (pen_mask & 4)>>2;
							}

							if((yi >= 16 && m_scrn_reg.v400_mode == 0) || (yi >= 32 && m_scrn_reg.v400_mode == 1))
								pen[0] = pen[1] = pen[2] = 0;
						}
						else if(pcg_bank) // PCG
						{
							tile_offset  = tile * 8;
							tile_offset += (yi+dy*(m_scrn_reg.v400_mode+1)) >> (height+m_scrn_reg.v400_mode);

							pen[0] = gfx_data[tile_offset+0x0000]>>(7-xi) & (pen_mask & 1)>>0;
							pen[1] = gfx_data[tile_offset+0x0800]>>(7-xi) & (pen_mask & 2)>>1;
							pen[2] = gfx_data[tile_offset+0x1000]>>(7-xi) & (pen_mask & 4)>>2;

							if((yi >= 8 && m_scrn_reg.v400_mode == 0) || (yi >= 16 && m_scrn_reg.v400_mode == 1))
								pen[0] = pen[1] = pen[2] = 0;
						}
						else
						{
							tile_offset  = tile * (8*(m_scrn_reg.ank_sel+1));
							tile_offset += (yi+dy*(m_scrn_reg.v400_mode+1)) >> (height+m_scrn_reg.v400_mode);

							pen[0] = gfx_data[tile_offset+m_scrn_reg.ank_sel*0x0800]>>(7-xi) & (pen_mask & 1)>>0;
							pen[1] = gfx_data[tile_offset+m_scrn_reg.ank_sel*0x0800]>>(7-xi) & (pen_mask & 2)>>1;
							pen[2] = gfx_data[tile_offset+m_scrn_reg.ank_sel*0x0800]>>(7-xi) & (pen_mask & 4)>>2;

							if(m_scrn_reg.ank_sel)
							{
								if((yi >= 16 && m_scrn_reg.v400_mode == 0) || (yi >= 32 && m_scrn_reg.v400_mode == 1))
									pen[0] = pen[1] = pen[2] = 0;
							}
							else
							{
								if((yi >=  8 && m_scrn_reg.v400_mode == 0) || (yi >= 16 && m_scrn_reg.v400_mode == 1))
									pen[0] = pen[1] = pen[2] = 0;
							}
						}

						pcg_pen = pen[2]<<2|pen[1]<<1|pen[0]<<0;

						if(color & 0x10 && m_screen->frame_number() & 0x10) //reverse flickering
							pcg_pen^=7;

						if(pcg_pen == 0 && (!(color & 8)))
							continue;

						if(color & 8) //revert the used color pen
							pcg_pen^=7;

						if((m_scrn_reg.blackclip & 8) && (color == (m_scrn_reg.blackclip & 7)))
							pcg_pen = 0; // clip the pen to black

						res_x = x*8+xi*(width+1);
						res_y = y*(mc6845_tile_height)+yi;

						if(res_y < cliprect.min_y || res_y > cliprect.max_y) // partial update, TODO: optimize
							continue;

						x1_draw_pixel(bitmap,res_y,res_x,pcg_pen,width,0);
					}
				}
			}

			if(width) //skip next char if we are under double width condition
				x++;
		}
	}
}

/*
 * Priority Mixer Calculation (pri)
 *
 * If pri is 0xff then the bitmap entirely covers the tilemap, if it's 0x00 then
 * the tilemap priority is entirely above the bitmap. Any other value mixes the
 * bitmap and the tilemap priorities based on the pen value, bit 0 = entry 0 <-> bit 7 = entry 7
 * of the bitmap.
 *
 */
int x1_state::priority_mixer_pri(int color)
{
	int pri_i,pri_mask_calc;

	pri_i = 0;
	pri_mask_calc = 1;

	while(pri_i < 7)
	{
		if((color & 7) == pri_i)
			break;

		pri_i++;
		pri_mask_calc<<=1;
	}

	return pri_mask_calc;
}

void x1_state::draw_gfxbitmap(bitmap_rgb32 &bitmap,const rectangle &cliprect, int plane,int pri)
{
	int xi,yi,x,y;
	int pen_r,pen_g,pen_b,color;
	int pri_mask_val;
	uint8_t x_size,y_size;
	int gfx_offset;

	x_size = mc6845_h_display;
	y_size = mc6845_v_display;

	if(x_size == 0 || y_size == 0)
		return; //don't bother if screen is off

	if(x_size != 80 && x_size != 40 && y_size != 25)
		popmessage("%d %d",x_size,y_size);

	//popmessage("%04x %02x",mc6845_start_addr,mc6845_tile_height);

	for (y=0;y<y_size;y++)
	{
		for(x=0;x<x_size;x++)
		{
			for(yi=0;yi<(mc6845_tile_height);yi++)
			{
				for(xi=0;xi<8;xi++)
				{
					gfx_offset = ((x+(y*x_size)) + mc6845_start_addr) & 0x7ff;
					gfx_offset+= ((yi >> m_scrn_reg.v400_mode) * 0x800) & 0x3fff;
					pen_b = (m_gfx_bitmap_ram[gfx_offset+0x0000+plane*0xc000]>>(7-xi)) & 1;
					pen_r = (m_gfx_bitmap_ram[gfx_offset+0x4000+plane*0xc000]>>(7-xi)) & 1;
					pen_g = (m_gfx_bitmap_ram[gfx_offset+0x8000+plane*0xc000]>>(7-xi)) & 1;

					color =  (pen_g<<2 | pen_r<<1 | pen_b<<0) | 8;

					pri_mask_val = priority_mixer_pri(color);
					if(pri_mask_val & pri) continue;

					if((color == 8 && m_scrn_reg.blackclip & 0x10) || (color == 9 && m_scrn_reg.blackclip & 0x20)) // bitmap color clip to black conditions
						color = 0;

					if(y*(mc6845_tile_height)+yi < cliprect.min_y || y*(mc6845_tile_height)+yi > cliprect.max_y) // partial update TODO: optimize
						continue;

					x1_draw_pixel(bitmap,y*(mc6845_tile_height)+yi,x*8+xi,color,0,0);
				}
			}
		}
	}
}

uint32_t x1_state::screen_update_x1(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
	bitmap.fill(rgb_t(0xff,0x00,0x00,0x00), cliprect);

	/* TODO: correct calculation thru mc6845 regs */
	m_xstart = ((mc6845_h_char_total - mc6845_h_sync_pos) * 8) / 2;
	m_ystart = ((mc6845_v_char_total - mc6845_v_sync_pos) * 8) / 2;

//  popmessage("%d %d %d %d",mc6845_h_sync_pos,mc6845_v_sync_pos,mc6845_h_char_total,mc6845_v_char_total);

	draw_gfxbitmap(bitmap,cliprect,m_scrn_reg.disp_bank,m_scrn_reg.pri);
	draw_fgtilemap(bitmap,cliprect);
	draw_gfxbitmap(bitmap,cliprect,m_scrn_reg.disp_bank,m_scrn_reg.pri^0xff);

	return 0;
}