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MDEC: Tweak block timing further 

Improves frame rate during animated backgrounds in Final Fantasy VII.
This commit is contained in:
Connor McLaughlin 2023-01-12 16:48:32 +10:00
parent a56ce290d4
commit 3e0be0a577
1 changed files with 4 additions and 11 deletions
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15
src/core/mdec.cpp
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@ -21,6 +21,7 @@ namespace MDEC {
static constexpr u32 DATA_IN_FIFO_SIZE = 1024;
static constexpr u32 DATA_OUT_FIFO_SIZE = 768;
static constexpr u32 NUM_BLOCKS = 6;
static constexpr TickCount TICKS_PER_BLOCK = 448;
enum DataOutputDepth : u8
{
@ -411,7 +412,7 @@ void MDEC::Execute()
if (HandleDecodeMacroblockCommand())
{
// we should be writing out now
Assert(s_state == State::WritingMacroblock);
DebugAssert(s_state == State::WritingMacroblock);
goto finished;
}
@ -487,14 +488,6 @@ bool MDEC::HandleDecodeMacroblockCommand()
return DecodeColoredMacroblock();
}
// Parasite Eve needs slightly higher timing in 16bpp mode, Disney's Treasure Planet needs lower timing in 24bpp mode.
static constexpr std::array<TickCount, 4> s_ticks_per_block = {{
448, // 4bpp
448, // 8bpp
448, // 24bpp
550, // 16bpp
}};
bool MDEC::DecodeMonoMacroblock()
{
// TODO: This should guard the output not the input
@ -512,7 +505,7 @@ bool MDEC::DecodeMonoMacroblock()
y_to_mono(s_blocks[0]);
ScheduleBlockCopyOut(s_ticks_per_block[static_cast<u8>(s_status.data_output_depth)] * 6);
ScheduleBlockCopyOut(TICKS_PER_BLOCK * 6);
s_total_blocks_decoded++;
return true;
@ -542,7 +535,7 @@ bool MDEC::DecodeColoredMacroblock()
yuv_to_rgb(8, 8, s_blocks[0], s_blocks[1], s_blocks[5]);
s_total_blocks_decoded += 4;
ScheduleBlockCopyOut(s_ticks_per_block[static_cast<u8>(s_status.data_output_depth)] * 6);
ScheduleBlockCopyOut(TICKS_PER_BLOCK * 6);
return true;
}