Fix the case of SEGA intro cropped in half

1 files changed, 4 insertions, 4 deletions

diff --git a/vdp.cpp b/vdp.cpp
index de4d05d..df8722d 100644
--- a/vdp.cpp
+++ b/vdp.cpp
@@ -660,10 +660,10 @@ void VDP::writeControl(const uint16_t value)
         const uint8_t dma_address_mode = (_address_mode >> 4) & 0x3;
         if (MODESET2_M1_GET(mode_set_2) && dma_address_mode) {
             const uint16_t destination_address = _address;
-            const uint16_t transfer_size =
-                _reg[static_cast<size_t>(RegID::kDMALengthCounterLow)] |
-                (_reg[static_cast<size_t>(RegID::kDMALengthCounterHigh)] << 8);
             const uint8_t increment = _reg[static_cast<size_t>(RegID::kAutoIncrement)];
+            const uint16_t transfer_size = increment *
+                (_reg[static_cast<size_t>(RegID::kDMALengthCounterLow)] |
+                (_reg[static_cast<size_t>(RegID::kDMALengthCounterHigh)] << 8));
             const uint8_t dma_action =
                 DMASRCADRHIGH_DMD_GET(_reg[static_cast<size_t>(RegID::kDMASourceAddressHigh)]);
             switch (dma_action) {
@@ -683,7 +683,7 @@ void VDP::writeControl(const uint16_t value)
                             destination_address,
                             transfer_size,
                             increment);
-                    _address += transfer_size * increment / 2;
+                    _address += transfer_size;
                 }
                 break;
             case 2: