Mercurial > repos > blastem
comparison vdp.c @ 459:c49ecf575784
Revert change to VBLANK flag timing based on new direct color DMA test
author | Mike Pavone <pavone@retrodev.com> |
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date | Sun, 08 Sep 2013 20:48:33 -0700 |
parents | e9b6fe443bf2 |
children | 6221f8f534fa |
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458:848a3db9d0b0 | 459:c49ecf575784 |
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1562 if ((context->regs[REG_MODE_4] & BIT_INTERLACE) && context->framebuf == context->oddbuf) { | 1562 if ((context->regs[REG_MODE_4] & BIT_INTERLACE) && context->framebuf == context->oddbuf) { |
1563 value |= 0x10; | 1563 value |= 0x10; |
1564 } | 1564 } |
1565 uint32_t line= context->cycles / MCLKS_LINE; | 1565 uint32_t line= context->cycles / MCLKS_LINE; |
1566 uint32_t linecyc = context->cycles % MCLKS_LINE; | 1566 uint32_t linecyc = context->cycles % MCLKS_LINE; |
1567 if (line >= (context->latched_mode & BIT_PAL ? PAL_ACTIVE : NTSC_ACTIVE) || context->cycles < (context->latched_mode & BIT_H40 ? 16*4 : 16*5)) { | 1567 if (line >= (context->latched_mode & BIT_PAL ? PAL_ACTIVE : NTSC_ACTIVE)) { |
1568 value |= 0x8; | 1568 value |= 0x8; |
1569 } | 1569 } |
1570 if (linecyc < (context->latched_mode & BIT_H40 ? HBLANK_CLEAR_H40 : HBLANK_CLEAR_H32)) { | 1570 if (linecyc < (context->latched_mode & BIT_H40 ? HBLANK_CLEAR_H40 : HBLANK_CLEAR_H32)) { |
1571 value |= 0x4; | 1571 value |= 0x4; |
1572 } | 1572 } |
1574 value |= 0x2; | 1574 value |= 0x2; |
1575 } | 1575 } |
1576 if (context->latched_mode & BIT_PAL) {//Not sure about this, need to verify | 1576 if (context->latched_mode & BIT_PAL) {//Not sure about this, need to verify |
1577 value |= 0x1; | 1577 value |= 0x1; |
1578 } | 1578 } |
1579 //printf("status read at cycle %d returned %X\n", context->cycles, value); | |
1579 //TODO: Sprite overflow, sprite collision, odd frame flag | 1580 //TODO: Sprite overflow, sprite collision, odd frame flag |
1580 return value; | 1581 return value; |
1581 } | 1582 } |
1582 | 1583 |
1583 uint16_t vdp_data_port_read(vdp_context * context) | 1584 uint16_t vdp_data_port_read(vdp_context * context) |