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comparison genesis.c @ 1170:9170fc4d9835

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Don't adjust cycles every frame. Only when we start getting close to UINT_MAX. Don't adjust all the way down to zero when we do adjust. Shouldn't fix anything, but may make debugging current issues easier.
author Michael Pavone <pavone@retrodev.com>
date Sun, 15 Jan 2017 22:54:01 -0800
parents 9fc680b35dbb
children b1147418254a
comparison
equal deleted inserted replaced
1169:82d8b9324b10 1170:9170fc4d9835
146 #define REFRESH_DELAY 2 146 #define REFRESH_DELAY 2
147 uint32_t last_sync_cycle; 147 uint32_t last_sync_cycle;
148 uint32_t refresh_counter; 148 uint32_t refresh_counter;
149 #endif 149 #endif
150 150
151 #include <limits.h>
152 #define ADJUST_BUFFER (8*MCLKS_LINE*313)
153 #define MAX_NO_ADJUST (UINT_MAX-ADJUST_BUFFER)
154
151 m68k_context * sync_components(m68k_context * context, uint32_t address) 155 m68k_context * sync_components(m68k_context * context, uint32_t address)
152 { 156 {
153 genesis_context * gen = context->system; 157 genesis_context * gen = context->system;
154 vdp_context * v_context = gen->vdp; 158 vdp_context * v_context = gen->vdp;
155 z80_context * z_context = gen->z80; 159 z80_context * z_context = gen->z80;
174 --exit_after; 178 --exit_after;
175 if (!exit_after) { 179 if (!exit_after) {
176 exit(0); 180 exit(0);
177 } 181 }
178 } 182 }
179 183 if (context->current_cycle > MAX_NO_ADJUST) {
180 vdp_adjust_cycles(v_context, mclks); 184 uint32_t deduction = mclks - ADJUST_BUFFER;
181 io_adjust_cycles(gen->io.ports, context->current_cycle, mclks); 185 vdp_adjust_cycles(v_context, deduction);
182 io_adjust_cycles(gen->io.ports+1, context->current_cycle, mclks); 186 io_adjust_cycles(gen->io.ports, context->current_cycle, deduction);
183 io_adjust_cycles(gen->io.ports+2, context->current_cycle, mclks); 187 io_adjust_cycles(gen->io.ports+1, context->current_cycle, deduction);
184 context->current_cycle -= mclks; 188 io_adjust_cycles(gen->io.ports+2, context->current_cycle, deduction);
185 z80_adjust_cycles(z_context, mclks); 189 context->current_cycle -= deduction;
186 gen->ym->current_cycle -= mclks; 190 z80_adjust_cycles(z_context, deduction);
187 gen->psg->cycles -= mclks; 191 gen->ym->current_cycle -= deduction;
188 if (gen->ym->write_cycle != CYCLE_NEVER) { 192 gen->psg->cycles -= deduction;
189 gen->ym->write_cycle = gen->ym->write_cycle >= mclks ? gen->ym->write_cycle - mclks : 0; 193 if (gen->ym->write_cycle != CYCLE_NEVER) {
194 gen->ym->write_cycle = gen->ym->write_cycle >= deduction ? gen->ym->write_cycle - deduction : 0;
195 }
190 } 196 }
191 } 197 }
192 gen->frame_end = vdp_cycles_to_frame_end(v_context); 198 gen->frame_end = vdp_cycles_to_frame_end(v_context);
193 context->sync_cycle = gen->frame_end; 199 context->sync_cycle = gen->frame_end;
194 //printf("Set sync cycle to: %d @ %d, vcounter: %d, hslot: %d\n", context->sync_cycle, context->current_cycle, v_context->vcounter, v_context->hslot); 200 //printf("Set sync cycle to: %d @ %d, vcounter: %d, hslot: %d\n", context->sync_cycle, context->current_cycle, v_context->vcounter, v_context->hslot);