Mercurial > repos > blastem
diff blastem.c @ 680:4996369f1463
Some small synchronization improvements that do not seem to fix anything
author | Michael Pavone <pavone@retrodev.com> |
---|---|
date | Sun, 04 Jan 2015 23:05:37 -0800 |
parents | 7dd83295193a |
children | 7ed1dbb48f61 |
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--- a/blastem.c Sun Jan 04 12:25:33 2015 -0800 +++ b/blastem.c Sun Jan 04 23:05:37 2015 -0800 @@ -210,41 +210,45 @@ z80_context * z_context = gen->z80; uint32_t mclks = context->current_cycle; sync_z80(z_context, mclks); + sync_sound(gen, mclks); if (mclks >= mclk_target) { - sync_sound(gen, mclks); - gen->ym->current_cycle -= mclk_target; - gen->psg->cycles -= mclk_target; - if (gen->ym->write_cycle != CYCLE_NEVER) { - gen->ym->write_cycle = gen->ym->write_cycle >= mclk_target ? gen->ym->write_cycle - mclk_target : 0; - } vdp_run_context(v_context, mclk_target); - //printf("reached frame end | MCLK Cycles: %d, Target: %d, VDP cycles: %d\n", mclks, mclk_target, v_context->cycles); + if (vdp_is_frame_over(v_context)) { + //printf("reached frame end | MCLK Cycles: %d, Target: %d, VDP cycles: %d\n", mclks, mclk_target, v_context->cycles); - if (!headless) { - break_on_sync |= wait_render_frame(v_context, frame_limit); - } else if(exit_after){ - --exit_after; - if (!exit_after) { - exit(0); + if (!headless) { + break_on_sync |= wait_render_frame(v_context, frame_limit); + } else if(exit_after){ + --exit_after; + if (!exit_after) { + exit(0); + } } + frame++; + mclks -= mclk_target; + vdp_adjust_cycles(v_context, mclk_target); + io_adjust_cycles(gen->ports, context->current_cycle, mclk_target); + io_adjust_cycles(gen->ports+1, context->current_cycle, mclk_target); + io_adjust_cycles(gen->ports+2, context->current_cycle, mclk_target); + context->current_cycle -= mclk_target; + z80_adjust_cycles(z_context, mclk_target); + gen->ym->current_cycle -= mclk_target; + gen->psg->cycles -= mclk_target; + if (gen->ym->write_cycle != CYCLE_NEVER) { + gen->ym->write_cycle = gen->ym->write_cycle >= mclk_target ? gen->ym->write_cycle - mclk_target : 0; + } + if (mclks) { + vdp_run_context(v_context, mclks); + } + mclk_target = vdp_cycles_to_frame_end(v_context); + context->sync_cycle = mclk_target; + } else { + vdp_run_context(v_context, mclks); + mclk_target = vdp_cycles_to_frame_end(v_context); } - frame++; - mclks -= mclk_target; - vdp_adjust_cycles(v_context, mclk_target); - io_adjust_cycles(gen->ports, context->current_cycle, mclk_target); - io_adjust_cycles(gen->ports+1, context->current_cycle, mclk_target); - io_adjust_cycles(gen->ports+2, context->current_cycle, mclk_target); - context->current_cycle -= mclk_target; - z80_adjust_cycles(z_context, mclk_target); - if (mclks) { - vdp_run_context(v_context, mclks); - } - mclk_target = vdp_cycles_to_frame_end(v_context); - context->sync_cycle = mclk_target; } else { //printf("running VDP for %d cycles\n", mclks - v_context->cycles); vdp_run_context(v_context, mclks); - sync_sound(gen, mclks); } if (context->int_ack) { vdp_int_ack(v_context, context->int_ack); @@ -284,7 +288,6 @@ int blocked; uint32_t before_cycle = v_context->cycles; if (vdp_port < 4) { - gen->bus_busy = 1; while (vdp_data_port_write(v_context, value) < 0) { while(v_context->flags & FLAG_DMA_RUN) { vdp_run_dma_done(v_context, mclk_target); @@ -296,7 +299,6 @@ //context->current_cycle = v_context->cycles; } } else if(vdp_port < 8) { - gen->bus_busy = 1; blocked = vdp_control_port_write(v_context, value); if (blocked) { while (blocked) { @@ -323,19 +325,16 @@ if (v_context->cycles != before_cycle) { //printf("68K paused for %d (%d) cycles at cycle %d (%d) for write\n", v_context->cycles - context->current_cycle, v_context->cycles - before_cycle, context->current_cycle, before_cycle); context->current_cycle = v_context->cycles; + //Lock the Z80 out of the bus until the VDP access is complete + gen->bus_busy = 1; + sync_z80(gen->z80, v_context->cycles); + gen->bus_busy = 0; } } else if (vdp_port < 0x18) { - sync_sound(gen, context->current_cycle); psg_write(gen->psg, value); } else { //TODO: Implement undocumented test register(s) } - if (gen->bus_busy) - { - //Lock the Z80 out of the bus until the VDP access is complete - sync_z80(gen->z80, v_context->cycles); - gen->bus_busy = 0; - } return context; } @@ -402,6 +401,11 @@ if (v_context->cycles != before_cycle) { //printf("68K paused for %d (%d) cycles at cycle %d (%d) for read\n", v_context->cycles - context->current_cycle, v_context->cycles - before_cycle, context->current_cycle, before_cycle); context->current_cycle = v_context->cycles; + //Lock the Z80 out of the bus until the VDP access is complete + genesis_context *gen = context->system; + gen->bus_busy = 1; + sync_z80(gen->z80, v_context->cycles); + gen->bus_busy = 0; } return value; }