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comparison ym2612.c @ 1308:1b3fe6e03e7b

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Reset YM2612 whenver the Z80 is reset. Fixes issue with stuck notes in Fantastic Dizzy and Kid Chameleon
author Michael Pavone <pavone@retrodev.com>
date Thu, 30 Mar 2017 23:57:30 -0700
parents babff81e4cfd
children 4d16c09210fd
comparison
equal deleted inserted replaced
1307:3cdc4e33a2c4 1308:1b3fe6e03e7b
126 126
127 #ifdef __ANDROID__ 127 #ifdef __ANDROID__
128 #define log2(x) (log(x)/log(2)) 128 #define log2(x) (log(x)/log(2))
129 #endif 129 #endif
130 130
131
132 #define TIMER_A_MAX 1023
133 #define TIMER_B_MAX 255
134
135 void ym_reset(ym2612_context *context)
136 {
137 memset(context->part1_regs, 0, sizeof(context->part1_regs));
138 memset(context->part2_regs, 0, sizeof(context->part2_regs));
139 memset(context->operators, 0, sizeof(context->operators));
140 memset(context->channels, 0, sizeof(context->channels));
141 memset(context->ch3_supp, 0, sizeof(context->ch3_supp));
142 context->selected_reg = 0;
143 context->csm_keyon = 0;
144 context->ch3_mode = 0;
145 context->dac_enable = 0;
146 context->status = 0;
147 context->timer_a_load = 0;
148 context->timer_b_load = 0;
149 //TODO: Confirm these on hardware
150 context->timer_a = TIMER_A_MAX;
151 context->timer_b = TIMER_B_MAX;
152
153 //TODO: Reset LFO state
154
155 //some games seem to expect that the LR flags start out as 1
156 for (int i = 0; i < NUM_CHANNELS; i++) {
157 context->channels[i].lr = 0xC0;
158 }
159 context->write_cycle = CYCLE_NEVER;
160 for (int i = 0; i < NUM_OPERATORS; i++) {
161 context->operators[i].envelope = MAX_ENVELOPE;
162 context->operators[i].env_phase = PHASE_RELEASE;
163 }
164 }
165
131 void ym_init(ym2612_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t sample_limit, uint32_t options, uint32_t lowpass_cutoff) 166 void ym_init(ym2612_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t sample_limit, uint32_t options, uint32_t lowpass_cutoff)
132 { 167 {
133 static uint8_t registered_finalize; 168 static uint8_t registered_finalize;
134 dfopen(debug_file, "ym_debug.txt", "w"); 169 dfopen(debug_file, "ym_debug.txt", "w");
135 memset(context, 0, sizeof(*context)); 170 memset(context, 0, sizeof(*context));
143 double dt = 1.0 / ((double)master_clock / (double)(context->clock_inc * NUM_OPERATORS)); 178 double dt = 1.0 / ((double)master_clock / (double)(context->clock_inc * NUM_OPERATORS));
144 double alpha = dt / (dt + rc); 179 double alpha = dt / (dt + rc);
145 context->lowpass_alpha = (int32_t)(((double)0x10000) * alpha); 180 context->lowpass_alpha = (int32_t)(((double)0x10000) * alpha);
146 181
147 context->sample_limit = sample_limit*2; 182 context->sample_limit = sample_limit*2;
148 context->write_cycle = CYCLE_NEVER; 183
149 for (int i = 0; i < NUM_OPERATORS; i++) {
150 context->operators[i].envelope = MAX_ENVELOPE;
151 context->operators[i].env_phase = PHASE_RELEASE;
152 }
153 //some games seem to expect that the LR flags start out as 1 184 //some games seem to expect that the LR flags start out as 1
154 for (int i = 0; i < NUM_CHANNELS; i++) { 185 for (int i = 0; i < NUM_CHANNELS; i++) {
155 context->channels[i].lr = 0xC0;
156 if (options & YM_OPT_WAVE_LOG) { 186 if (options & YM_OPT_WAVE_LOG) {
157 char fname[64]; 187 char fname[64];
158 sprintf(fname, "ym_channel_%d.wav", i); 188 sprintf(fname, "ym_channel_%d.wav", i);
159 FILE * f = context->channels[i].logfile = fopen(fname, "wb"); 189 FILE * f = context->channels[i].logfile = fopen(fname, "wb");
160 if (!f) { 190 if (!f) {
229 lfo_pm_table[freq * 256 + pms * 32 + step] = value; 259 lfo_pm_table[freq * 256 + pms * 32 + step] = value;
230 } 260 }
231 } 261 }
232 } 262 }
233 } 263 }
264 ym_reset(context);
234 } 265 }
235 266
236 void ym_free(ym2612_context *context) 267 void ym_free(ym2612_context *context)
237 { 268 {
238 if (context == log_context) { 269 if (context == log_context) {
246 } 277 }
247 278
248 #define YM_VOLUME_MULTIPLIER 2 279 #define YM_VOLUME_MULTIPLIER 2
249 #define YM_VOLUME_DIVIDER 3 280 #define YM_VOLUME_DIVIDER 3
250 #define YM_MOD_SHIFT 1 281 #define YM_MOD_SHIFT 1
251
252 #define TIMER_A_MAX 1023
253 #define TIMER_B_MAX 255
254 282
255 #define CSM_MODE 0x80 283 #define CSM_MODE 0x80
256 284
257 #define SSG_ENABLE 8 285 #define SSG_ENABLE 8
258 #define SSG_INVERT 4 286 #define SSG_INVERT 4