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comparison vdp.c @ 494:8ac0eb05642c

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Initial implementation of sprite overflow and sprite collision status register flags
author Mike Pavone <pavone@retrodev.com>
date Mon, 07 Oct 2013 10:02:08 -0700
parents 1f3450d1129f
children 27345a67225d
comparison
equal deleted inserted replaced
493:36c080ece4ed 494:8ac0eb05642c
154 } 154 }
155 //printf("Draw Slot %d of %d, Rendering sprite cell from %X to x: %d\n", context->cur_slot, context->sprite_draws, d->address, x); 155 //printf("Draw Slot %d of %d, Rendering sprite cell from %X to x: %d\n", context->cur_slot, context->sprite_draws, d->address, x);
156 context->cur_slot--; 156 context->cur_slot--;
157 for (uint16_t address = d->address; address != ((d->address+4) & 0xFFFF); address++) { 157 for (uint16_t address = d->address; address != ((d->address+4) & 0xFFFF); address++) {
158 if (x >= 0 && x < 320 && !(context->linebuf[x] & 0xF)) { 158 if (x >= 0 && x < 320 && !(context->linebuf[x] & 0xF)) {
159 if (context->linebuf[x] && (context->vdpmem[address] >> 4)) {
160 context->flags2 |= FLAG2_SPRITE_COLLIDE;
161 }
159 context->linebuf[x] = (context->vdpmem[address] >> 4) | d->pal_priority; 162 context->linebuf[x] = (context->vdpmem[address] >> 4) | d->pal_priority;
160 } 163 }
161 x += dir; 164 x += dir;
162 if (x >= 0 && x < 320 && !(context->linebuf[x] & 0xF)) { 165 if (x >= 0 && x < 320 && !(context->linebuf[x] & 0xF)) {
166 if (context->linebuf[x] && (context->vdpmem[address] & 0xF)) {
167 context->flags2 |= FLAG2_SPRITE_COLLIDE;
168 }
163 context->linebuf[x] = (context->vdpmem[address] & 0xF) | d->pal_priority; 169 context->linebuf[x] = (context->vdpmem[address] & 0xF) | d->pal_priority;
164 } 170 }
165 x += dir; 171 x += dir;
166 } 172 }
167 } 173 }
1537 value |= 0x100; 1543 value |= 0x100;
1538 } 1544 }
1539 if (context->flags2 & FLAG2_VINT_PENDING) { 1545 if (context->flags2 & FLAG2_VINT_PENDING) {
1540 value |= 0x80; 1546 value |= 0x80;
1541 } 1547 }
1548 if (context->flags & FLAG_DOT_OFLOW) {
1549 value |= 0x40;
1550 }
1551 if (context->flags2 & FLAG2_SPRITE_COLLIDE) {
1552 value |= 0x20;
1553 //TODO: Test when this is actually cleared
1554 context->flags2 &= ~FLAG2_SPRITE_COLLIDE;
1555 }
1542 if ((context->regs[REG_MODE_4] & BIT_INTERLACE) && context->framebuf == context->oddbuf) { 1556 if ((context->regs[REG_MODE_4] & BIT_INTERLACE) && context->framebuf == context->oddbuf) {
1543 value |= 0x10; 1557 value |= 0x10;
1544 } 1558 }
1545 uint32_t line= context->cycles / MCLKS_LINE; 1559 uint32_t line= context->cycles / MCLKS_LINE;
1546 uint32_t linecyc = context->cycles % MCLKS_LINE; 1560 uint32_t linecyc = context->cycles % MCLKS_LINE;
1555 } 1569 }
1556 if (context->latched_mode & BIT_PAL) {//Not sure about this, need to verify 1570 if (context->latched_mode & BIT_PAL) {//Not sure about this, need to verify
1557 value |= 0x1; 1571 value |= 0x1;
1558 } 1572 }
1559 //printf("status read at cycle %d returned %X\n", context->cycles, value); 1573 //printf("status read at cycle %d returned %X\n", context->cycles, value);
1560 //TODO: Sprite overflow, sprite collision, odd frame flag
1561 return value; 1574 return value;
1562 } 1575 }
1563 1576
1564 #define CRAM_BITS 0xEEE 1577 #define CRAM_BITS 0xEEE
1565 #define VSRAM_BITS 0x7FF 1578 #define VSRAM_BITS 0x7FF