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Simplify DMA handling

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This commit is contained in:
David Guillen Fandos 2021-08-21 19:41:52 +02:00
parent a3377c2ac1
commit fb830447ba
1 changed files with 13 additions and 75 deletions
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88
gba_memory.c
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@ -2831,86 +2831,24 @@ cpu_alert_type dma_transfer(dma_transfer_type *dma)
src_ptr += first_length;
}
if(dma->length_type == DMA_16BIT)
if (dma->source_direction < 3)
{
src_ptr &= ~0x01;
dest_ptr &= ~0x01;
const int stridetbl[4] = {1, -1, 0, 1};
int dst_stride = stridetbl[dma->dest_direction];
int src_stride = stridetbl[dma->source_direction];
bool dst_wb = dma->dest_direction < 3;
switch((dma->dest_direction << 2) | dma->source_direction)
if(dma->length_type == DMA_16BIT)
{
case 0x00:
ret = dma_tf_loop16(src_ptr, dest_ptr, 2, 2, true, length, dma); break;
case 0x01:
ret = dma_tf_loop16(src_ptr, dest_ptr, -2, 2, true, length, dma); break;
case 0x02:
ret = dma_tf_loop16(src_ptr, dest_ptr, 0, 2, true, length, dma); break;
case 0x03:
break;
case 0x04:
ret = dma_tf_loop16(src_ptr, dest_ptr, 2, -2, true, length, dma); break;
case 0x05:
ret = dma_tf_loop16(src_ptr, dest_ptr, -2, -2, true, length, dma); break;
case 0x06:
ret = dma_tf_loop16(src_ptr, dest_ptr, 0, -2, true, length, dma); break;
case 0x07:
break;
case 0x08:
ret = dma_tf_loop16(src_ptr, dest_ptr, 2, 0, true, length, dma); break;
case 0x09:
ret = dma_tf_loop16(src_ptr, dest_ptr, -2, 0, true, length, dma); break;
case 0x0A:
ret = dma_tf_loop16(src_ptr, dest_ptr, 0, 0, true, length, dma); break;
case 0x0B:
break;
case 0x0C:
ret = dma_tf_loop16(src_ptr, dest_ptr, 2, 2, false, length, dma); break;
case 0x0D:
ret = dma_tf_loop16(src_ptr, dest_ptr, -2, 2, false, length, dma); break;
case 0x0E:
ret = dma_tf_loop16(src_ptr, dest_ptr, 0, 2, false, length, dma); break;
case 0x0F:
break;
src_ptr &= ~0x01;
dest_ptr &= ~0x01;
ret = dma_tf_loop16(src_ptr, dest_ptr, 2 * src_stride, 2 * dst_stride, dst_wb, length, dma);
}
}
else
{
src_ptr &= ~0x03;
dest_ptr &= ~0x03;
switch((dma->dest_direction << 2) | dma->source_direction)
else
{
case 0x00:
ret = dma_tf_loop32(src_ptr, dest_ptr, 4, 4, true, length, dma); break;
case 0x01:
ret = dma_tf_loop32(src_ptr, dest_ptr, -4, 4, true, length, dma); break;
case 0x02:
ret = dma_tf_loop32(src_ptr, dest_ptr, 0, 4, true, length, dma); break;
case 0x03:
break;
case 0x04:
ret = dma_tf_loop32(src_ptr, dest_ptr, 4, -4, true, length, dma); break;
case 0x05:
ret = dma_tf_loop32(src_ptr, dest_ptr, -4, -4, true, length, dma); break;
case 0x06:
ret = dma_tf_loop32(src_ptr, dest_ptr, 0, -4, true, length, dma); break;
case 0x07:
break;
case 0x08:
ret = dma_tf_loop32(src_ptr, dest_ptr, 4, 0, true, length, dma); break;
case 0x09:
ret = dma_tf_loop32(src_ptr, dest_ptr, -4, 0, true, length, dma); break;
case 0x0A:
ret = dma_tf_loop32(src_ptr, dest_ptr, 0, 0, true, length, dma); break;
case 0x0B:
break;
case 0x0C:
ret = dma_tf_loop32(src_ptr, dest_ptr, 4, 4, false, length, dma); break;
case 0x0D:
ret = dma_tf_loop32(src_ptr, dest_ptr, -4, 4, false, length, dma); break;
case 0x0E:
ret = dma_tf_loop32(src_ptr, dest_ptr, 0, 4, false, length, dma); break;
case 0x0F:
break;
src_ptr &= ~0x03;
dest_ptr &= ~0x03;
ret = dma_tf_loop32(src_ptr, dest_ptr, 4 * src_stride, 4 * dst_stride, dst_wb, length, dma);
}
}