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comparison jag_video.c @ 1097:faa3a4617f62

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Get Jaguar video interrupt working
author Michael Pavone <pavone@retrodev.com>
date Sat, 05 Nov 2016 00:23:11 -0700
parents a68274a25e2f
children 4a726e339d6f
comparison
equal deleted inserted replaced
1096:1ab30d427db8 1097:faa3a4617f62
184 OBJ_SCALED, 184 OBJ_SCALED,
185 OBJ_GPU, 185 OBJ_GPU,
186 OBJ_BRANCH, 186 OBJ_BRANCH,
187 OBJ_STOP 187 OBJ_STOP
188 }; 188 };
189
190 uint32_t jag_cycles_to_halfline(jag_video *context, uint32_t target)
191 {
192 uint32_t cycles = context->regs[VID_HPERIOD] - (context->regs[VID_HCOUNT & 0x3FF]);
193 uint32_t num_lines;
194 if (context->regs[VID_VCOUNT] < target) {
195 num_lines = target - 1 - context->regs[VID_VCOUNT];
196 } else {
197 num_lines = target + context->regs[VID_VPERIOD] - context->regs[VID_VCOUNT];
198 }
199 cycles += num_lines * context->regs[VID_HPERIOD];
200 return cycles;
201 }
202
203 uint32_t jag_next_vid_interrupt(jag_video *context)
204 {
205 if (context->regs[VID_VINT] > context->regs[VID_VPERIOD]) {
206 return 0xFFFFFFF;
207 }
208 return context->cycles + jag_cycles_to_halfline(context, context->regs[VID_VINT]);
209 }
189 210
190 void op_run(jag_video *context) 211 void op_run(jag_video *context)
191 { 212 {
192 while (context->op.cycles < context->cycles) 213 while (context->op.cycles < context->cycles)
193 { 214 {
545 //increment half-line counter 566 //increment half-line counter
546 if (context->regs[VID_VCOUNT] == context->regs[VID_VPERIOD]) { 567 if (context->regs[VID_VCOUNT] == context->regs[VID_VPERIOD]) {
547 context->regs[VID_VCOUNT] = 0; 568 context->regs[VID_VCOUNT] = 0;
548 } else { 569 } else {
549 context->regs[VID_VCOUNT]++; 570 context->regs[VID_VCOUNT]++;
571 if (context->regs[VID_VCOUNT] == context->regs[VID_VINT]) {
572 context->cpu_int_pending |= BIT_CPU_VID_INT_ENABLED;
573 }
550 } 574 }
551 } else { 575 } else {
552 context->regs[VID_HCOUNT]++; 576 context->regs[VID_HCOUNT]++;
553 } 577 }
554 578