-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathMapper_119.c
249 lines (210 loc) · 7.28 KB
/
Mapper_119.c
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
#include "Mapper_119.h"
uint8 Mapper_119_regs[8];
uint32 Mapper_119_prg0,Mapper_119_prg1;
uint32 Mapper_119_chr01,Mapper_119_chr23,Mapper_119_chr4,Mapper_119_chr5,Mapper_119_chr6,Mapper_119_chr7;
bool chr_swap() { return Mapper_119_regs[0] & 0x80; }
bool prg_swap() { return Mapper_119_regs[0] & 0x40; }
uint8 Mapper_119_irq_enabled; // IRQs enabled
uint8 Mapper_119_irq_counter; // IRQ scanline counter, decreasing
uint8 Mapper_119_irq_latch; // IRQ scanline counter latch
void Mapper_119_MMC3_set_CPU_banks() {
uint32 num_8k_ROM_banks = NesHeader.byRomSize * 2;
if (prg_swap()) {
//printf("Setting Prg Bank1 to page [%u] and Bank2 to page [%u]\n",Mapper_119_prg1,Mapper_119_prg0);
ROMBANK0 = ROMLASTPAGE(1);
ROMBANK1 = ROMPAGE(Mapper_119_prg1 % num_8k_ROM_banks);
ROMBANK2 = ROMPAGE(Mapper_119_prg0 % num_8k_ROM_banks);
ROMBANK3 = ROMLASTPAGE(0);
} else {
//printf("Setting Prg Bank0 to page [%u] and Bank1 to page [%u]\n",Mapper_119_prg0,Mapper_119_prg1);
ROMBANK0 = ROMPAGE(Mapper_119_prg0 % num_8k_ROM_banks);
ROMBANK1 = ROMPAGE(Mapper_119_prg1 % num_8k_ROM_banks);
ROMBANK2 = ROMLASTPAGE(1);
ROMBANK3 = ROMLASTPAGE(0);
}
}
void Mapper_119_MMC3_set_PPU_banks() {
uint8 chr_bank[8];
if (chr_swap()) {
chr_bank[0] = Mapper_119_chr4;
chr_bank[1] = Mapper_119_chr5;
chr_bank[2] = Mapper_119_chr6;
chr_bank[3] = Mapper_119_chr7;
chr_bank[4] = Mapper_119_chr01+0;
chr_bank[5] = Mapper_119_chr01+1;
chr_bank[6] = Mapper_119_chr23+0;
chr_bank[7] = Mapper_119_chr23+1;
} else {
chr_bank[0] = Mapper_119_chr01+0;
chr_bank[1] = Mapper_119_chr01+1;
chr_bank[2] = Mapper_119_chr23+0;
chr_bank[3] = Mapper_119_chr23+1;
chr_bank[4] = Mapper_119_chr4;
chr_bank[5] = Mapper_119_chr5;
chr_bank[6] = Mapper_119_chr6;
chr_bank[7] = Mapper_119_chr7;
}
if (chr_bank[0] & 0x40) {
PPUBANK[0] = &VRAM[(chr_bank[0] & 0x07) * 0x400];
} else {
PPUBANK[0] = &VROM[chr_bank[0] * 0x400];
}
if (chr_bank[1] & 0x40) {
PPUBANK[1] = &VRAM[(chr_bank[1] & 0x07) * 0x400];
} else {
PPUBANK[1] = &VROM[chr_bank[1] * 0x400];
}
if (chr_bank[2] & 0x40) {
PPUBANK[2] = &VRAM[(chr_bank[2] & 0x07) * 0x400];
} else {
PPUBANK[2] = &VROM[chr_bank[2] * 0x400];
}
if (chr_bank[3] & 0x40) {
PPUBANK[3] = &VRAM[(chr_bank[3] & 0x07) * 0x400];
} else {
PPUBANK[3] = &VROM[chr_bank[3] * 0x400];
}
if (chr_bank[4] & 0x40) {
PPUBANK[4] = &VRAM[(chr_bank[4] & 0x07) * 0x400];
} else {
PPUBANK[4] = &VROM[chr_bank[4] * 0x400];
}
if (chr_bank[5] & 0x40) {
PPUBANK[5] = &VRAM[(chr_bank[5] & 0x07) * 0x400];
} else {
PPUBANK[5] = &VROM[chr_bank[5] * 0x400];
}
if (chr_bank[6] & 0x40) {
PPUBANK[6] = &VRAM[(chr_bank[6] & 0x07) * 0x400];
} else {
PPUBANK[6] = &VROM[chr_bank[6] * 0x400];
}
if (chr_bank[7] & 0x40) {
PPUBANK[7] = &VRAM[(chr_bank[7] & 0x07) * 0x400];
} else {
PPUBANK[7] = &VROM[chr_bank[7] * 0x400];
}
}
void Mapper_119_Init() {
for(int i = 0; i < 8; i++) Mapper_119_regs[i] = 0x00;
// set CPU bank pointers
Mapper_119_prg0 = 0;
Mapper_119_prg1 = 1;
Mapper_119_MMC3_set_CPU_banks();
// set VROM banks
Mapper_119_chr01 = 0;
Mapper_119_chr23 = 2;
Mapper_119_chr4 = 4;
Mapper_119_chr5 = 5;
Mapper_119_chr6 = 6;
Mapper_119_chr7 = 7;
Mapper_119_MMC3_set_PPU_banks();
Mapper_119_irq_enabled = 0;
Mapper_119_irq_counter = 0;
Mapper_119_irq_latch = 0;
K6502_Set_Int_Wiring( 1, 1 );
}
void Mapper_119_Write(uint16 addr, uint8 data) {
switch (addr & 0xE001) {
case 0x8000: {
Mapper_119_regs[0] = data;
Mapper_119_MMC3_set_PPU_banks();
Mapper_119_MMC3_set_CPU_banks();
} break;
case 0x8001: {
uint32 bank_num;
Mapper_119_regs[1] = data;
bank_num = Mapper_119_regs[1];
switch (Mapper_119_regs[0] & 0x07) {
case 0x00: {
if (NesHeader.byRomSize > 0) {
bank_num &= 0xfe;
Mapper_119_chr01 = bank_num;
Mapper_119_MMC3_set_PPU_banks();
}
} break;
case 0x01: {
if (NesHeader.byRomSize > 0) {
bank_num &= 0xfe;
Mapper_119_chr23 = bank_num;
Mapper_119_MMC3_set_PPU_banks();
}
} break;
case 0x02: {
if (NesHeader.byRomSize > 0) {
Mapper_119_chr4 = bank_num;
Mapper_119_MMC3_set_PPU_banks();
}
} break;
case 0x03: {
if (NesHeader.byRomSize > 0) {
Mapper_119_chr5 = bank_num;
Mapper_119_MMC3_set_PPU_banks();
}
} break;
case 0x04: {
if (NesHeader.byRomSize > 0) {
Mapper_119_chr6 = bank_num;
Mapper_119_MMC3_set_PPU_banks();
}
} break;
case 0x05: {
if (NesHeader.byRomSize > 0) {
Mapper_119_chr7 = bank_num;
Mapper_119_MMC3_set_PPU_banks();
}
} break;
case 0x06: {
Mapper_119_prg0 = bank_num;
Mapper_119_MMC3_set_CPU_banks();
} break;
case 0x07: {
Mapper_119_prg1 = bank_num;
Mapper_119_MMC3_set_CPU_banks();
} break;
}
} break;
case 0xA000: {
Mapper_119_regs[2] = data;
if (ROM_Mirroring != MIRRORING_FOUR_SCREEN) {
if (data & 0x01) {
pNesX_Mirroring(MIRRORING_HORIZONTAL);
} else {
pNesX_Mirroring(MIRRORING_VERTICAL);
}
}
} break;
case 0xA001: {
Mapper_119_regs[3] = data;
} break;
case 0xC000: {
Mapper_119_regs[4] = data;
Mapper_119_irq_counter = Mapper_119_regs[4];
} break;
case 0xC001: {
Mapper_119_regs[5] = data;
Mapper_119_irq_latch = Mapper_119_regs[5];
} break;
case 0xE000: {
Mapper_119_regs[6] = data;
Mapper_119_irq_enabled = 0;
} break;
case 0xE001: {
Mapper_119_regs[7] = data;
Mapper_119_irq_enabled = 1;
} break;
}
}
void Mapper_119_HSync() {
if (Mapper_119_irq_enabled) {
if ((ppuinfo.PPU_Scanline >= 0) && (ppuinfo.PPU_Scanline <= 239)) {
if (PPU_R1 & (R1_SHOW_SCR | R1_SHOW_SP )) {
if (Mapper_119_irq_counter == 0) {
Mapper_119_irq_counter = Mapper_119_irq_latch;
IRQ_REQ;
}
Mapper_119_irq_counter--;
}
}
}
}