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Matthew Daniels 2023-09-03 19:29:58 +01:00 committed by Bart Trzynadlowski
parent 24d24db988
commit 801945d066
1 changed files with 6 additions and 6 deletions
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12
Src/Model3/Model3.cpp
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@ -2048,15 +2048,15 @@ void CModel3::RunMainBoardFrame(void)
// Compute display timings // Compute display timings
unsigned ppcCycles = m_config["PowerPCFrequency"].ValueAs<unsigned>() * 1000000; unsigned ppcCycles = m_config["PowerPCFrequency"].ValueAs<unsigned>() * 1000000;
unsigned frameCycles = (unsigned)((float)ppcCycles / 57.524160f); unsigned frameCycles = (unsigned)((float)ppcCycles / 57.524160f);
unsigned lineCycles = frameCycles / 424; unsigned lineCycles = frameCycles / 424;
unsigned dispCycles = lineCycles * (TileGen.ReadRegister(0x08) + 40); unsigned dispCycles = lineCycles * (TileGen.ReadRegister(0x08) + 40);
unsigned offsetCycles = frameCycles - dispCycles; unsigned offsetCycles = frameCycles - dispCycles;
unsigned statusCycles = (unsigned)((float)frameCycles * (0.005f)); unsigned statusCycles = (unsigned)((float)frameCycles * (0.005f));
// Games will start writing a new frame after the ping-pong buffers have been flipped, which is indicated by the // Games will start writing a new frame after the ping-pong buffers have been flipped, which is indicated by the
// ping-pong status bit. The timing of ping-pong flip is determined by the value of tilegen register 0x08, which // ping-pong status bit. The timing of ping-pong flip is determined by the value of tilegen register 0x08, which
// is the number of active video lines to display before ping-pong flip occurs. Most games set it to 238 or 239 // is the number of active video lines to display before ping-pong flip occurs. Most games set it to 238 or 239
// so that ping-pong flip occurs 66% of the frame time after IRQ2, though a few games set it to a higher value. // so that ping-pong flip occurs 66% of the frame time after IRQ2, though a few games set it to a higher value.
// Scale PPC timer ratio according to speed at which the PowerPC is being emulated so that the observed running frequency of the PPC timer // Scale PPC timer ratio according to speed at which the PowerPC is being emulated so that the observed running frequency of the PPC timer
// registers is more or less correct. This is needed to get the Virtua Striker 2 series of games running at the right speed (they are // registers is more or less correct. This is needed to get the Virtua Striker 2 series of games running at the right speed (they are