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DVDInterface: Fix small backwards seek after non-cached seek 

If we seek to a block that isn't in the cache, the block prior
to it doesn't end up getting read into the buffer.
This commit is contained in:
JosJuice 2021-06-28 10:48:38 +02:00
parent c6ede09035
commit 4648e1a035
1 changed files with 12 additions and 0 deletions
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12
Source/Core/Core/HW/DVD/DVDInterface.cpp
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@ -1365,6 +1365,9 @@ static void ScheduleReads(u64 offset, u32 length, const DiscIO::Partition& parti
const u32 ticks_per_second = SystemTimers::GetTicksPerSecond();
const bool wii_disc = DVDThread::GetDiscType() == DiscIO::Platform::WiiDisc;
// Whether we have performed a seek.
bool seek = false;
// Where the DVD read head is (usually parked at the end of the buffer,
// unless we've interrupted it mid-buffer-read).
u64 head_position;
@ -1379,6 +1382,7 @@ static void ScheduleReads(u64 offset, u32 length, const DiscIO::Partition& parti
// It's rounded to a whole ECC block and never uses Wii partition addressing.
u64 dvd_offset = DVDThread::PartitionOffsetToRawOffset(offset, partition);
dvd_offset = Common::AlignDown(dvd_offset, DVD_ECC_BLOCK_SIZE);
const u64 first_block = dvd_offset;
if (SConfig::GetInstance().bFastDiscSpeed)
{
@ -1473,6 +1477,7 @@ static void ScheduleReads(u64 offset, u32 length, const DiscIO::Partition& parti
if (dvd_offset != head_position)
{
// Unbuffered seek+read
seek = true;
ticks_until_completion += static_cast<u64>(
ticks_per_second * DVDMath::CalculateSeekTime(head_position, dvd_offset));
@ -1543,6 +1548,13 @@ static void ScheduleReads(u64 offset, u32 length, const DiscIO::Partition& parti
}
s_read_buffer_end_offset = last_block + STREAMING_BUFFER_SIZE - BUFFER_BACKWARD_SEEK_LIMIT;
if (seek)
{
// If we seek, the block preceding the first accessed block never gets read into the buffer
s_read_buffer_end_offset =
std::max(s_read_buffer_end_offset, first_block + STREAMING_BUFFER_SIZE);
}
// Assume the buffer starts prefetching new blocks right after the end of the last operation
s_read_buffer_start_time = current_time + ticks_until_completion;
s_read_buffer_end_time =