Mercurial > repos > blastem
diff blastem.c @ 483:3e1573fa22cf
Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Tue, 01 Oct 2013 23:51:16 -0700 |
| parents | 4b24260125f3 |
| children | c08a4efeee7f |
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--- a/blastem.c Wed Sep 18 19:10:54 2013 -0700 +++ b/blastem.c Tue Oct 01 23:51:16 2013 -0700 @@ -33,6 +33,8 @@ #define LINES_NTSC 262 #define LINES_PAL 312 +#define MAX_SOUND_CYCLES 100000 + uint32_t mclks_per_frame = MCLKS_LINE*LINES_NTSC; uint16_t cart[CARTRIDGE_WORDS]; @@ -206,6 +208,13 @@ void sync_sound(genesis_context * gen, uint32_t target) { //printf("YM | Cycle: %d, bpos: %d, PSG | Cycle: %d, bpos: %d\n", gen->ym->current_cycle, gen->ym->buffer_pos, gen->psg->cycles, gen->psg->buffer_pos * 2); + while (target > gen->psg->cycles && target - gen->psg->cycles > MAX_SOUND_CYCLES) { + uint32_t cur_target = gen->psg->cycles + MAX_SOUND_CYCLES; + //printf("Running PSG to cycle %d\n", cur_target); + psg_run(gen->psg, cur_target); + //printf("Running YM-2612 to cycle %d\n", cur_target); + ym_run(gen->ym, cur_target); + } psg_run(gen->psg, target); ym_run(gen->ym, target); @@ -1492,6 +1501,17 @@ return context; } +void set_speed_percent(genesis_context * context, uint32_t percent) +{ + uint32_t old_clock = context->master_clock; + context->master_clock = ((uint64_t)context->normal_clock * (uint64_t)percent) / 100; + while (context->ym->current_cycle != context->psg->cycles) { + sync_sound(context, context->psg->cycles + MCLKS_PER_PSG); + } + ym_adjust_master_clock(context->ym, context->master_clock); + psg_adjust_master_clock(context->psg, context->master_clock); +} + #define ROM_END 0x1A4 #define RAM_ID 0x1B0 #define RAM_FLAGS 0x1B2 @@ -1868,23 +1888,23 @@ render_init(width, height, title, fps, fullscreen); } vdp_context v_context; + genesis_context gen; + memset(&gen, 0, sizeof(gen)); + gen.master_clock = gen.normal_clock = fps == 60 ? MCLKS_NTSC : MCLKS_PAL; init_vdp_context(&v_context); ym2612_context y_context; - ym_init(&y_context, render_sample_rate(), fps == 60 ? MCLKS_NTSC : MCLKS_PAL, MCLKS_PER_YM, render_audio_buffer(), ym_log ? YM_OPT_WAVE_LOG : 0); + ym_init(&y_context, render_sample_rate(), gen.master_clock, MCLKS_PER_YM, render_audio_buffer(), ym_log ? YM_OPT_WAVE_LOG : 0); psg_context p_context; - psg_init(&p_context, render_sample_rate(), fps == 60 ? MCLKS_NTSC : MCLKS_PAL, MCLKS_PER_PSG, render_audio_buffer()); + psg_init(&p_context, render_sample_rate(), gen.master_clock, MCLKS_PER_PSG, render_audio_buffer()); z80_context z_context; x86_z80_options z_opts; init_x86_z80_opts(&z_opts); init_z80_context(&z_context, &z_opts); - genesis_context gen; - memset(&gen, 0, sizeof(gen)); - z_context.system = &gen; z_context.mem_pointers[0] = z80_ram; z_context.sync_cycle = z_context.target_cycle = mclks_per_frame/MCLKS_PER_Z80;