diff options
Diffstat (limited to 'vdp.c')
| -rw-r--r-- | vdp.c | 20 |
1 files changed, 12 insertions, 8 deletions
@@ -910,9 +910,12 @@ int is_refresh(vdp_context * context) uint32_t linecyc = context->cycles % MCLKS_LINE; if (context->latched_mode & BIT_H40) { linecyc = linecyc/16; - return (linecyc == 73 || linecyc == 105 || linecyc == 137 || linecyc == 169 || linecyc == 201); + //TODO: Figure out the exact behavior that reduces DMA slots for direct color DMA demos + return (linecyc == 37 || linecyc == 69 || linecyc == 102 || linecyc == 133 || linecyc == 165 || linecyc == 197 || linecyc >= 210 || (linecyc < 6 && (context->flags & FLAG_DMA_RUN) && ((context->dma_cd & 0xF) == CRAM_WRITE))); } else { linecyc = linecyc/20; + //TODO: Figure out which slots are refresh when display is off in 32-cell mode + //The numbers below are the refresh slots during active display return (linecyc == 66 || linecyc == 98 || linecyc == 130 || linecyc == 162); } } @@ -925,21 +928,22 @@ void check_render_bg(vdp_context * context, int32_t line) uint32_t linecyc = (context->cycles % MCLKS_LINE); if (context->latched_mode & BIT_H40) { linecyc /= 16; - if (linecyc >= 55 && linecyc <= 207 && !((linecyc-55) % 8)) { - uint32_t x = ((linecyc-55)&(~0xF))*2; + if (linecyc >= 50 && linecyc < 210) { + uint32_t x = ((linecyc-50)&(~0x1))*2; start = context->framebuf + line * 320 + x; - end = start + 16; + end = start + 4; } } else { linecyc /= 20; - if (linecyc >= 48 && linecyc <= 168 && !((linecyc-48) % 8)) { - uint32_t x = ((linecyc-48)&(~0xF))*2; + if (linecyc >= 43 && linecyc < 171) { + uint32_t x = ((linecyc-48)&(~0x1))*2; start = context->framebuf + line * 256 + x; - end = start + 16; + end = start + 4; } } + uint16_t color = context->cram[context->regs[REG_BG_COLOR] & 0x3F]; while (start != end) { - *start = context->regs[REG_BG_COLOR] & 0x3F; + *start = color; ++start; } } |