[PCE] DMA handling improvements. Fixes sprite flicker issues on some games (ex: Dragon Curse), and several games that didn't boot or froze (ex: Magical Chase)
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@ -16,7 +16,6 @@ Chouzetsu Rinjin - Doesnt boot
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Cyber Dodge - Minor gfx issues
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Davis Cup Tennis - uh lets just say it doesnt work in creative ways
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Dead Moon - Minor gfx issues
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Dragon Curse - Terribly annoying sprite flicker - presumably timing related
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Dragon Egg - Doesn't boot
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Fighting Run - Corruption issues
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Final Solider - Graphics corruption issues
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@ -25,24 +24,25 @@ Gunboat - Crash / CPU Break (Needs BRAM)
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Hisou Kihei Serd - Doesn't boot
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Idol Hanafuda Fan Club - Doesn't boot
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Impossamole - Gfx issues
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Legendary Axe - Doesn't boot
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Legendary Axe II - Corruption, freezes in opening sequence
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Legendary Axe - Boots with bad gfx corruption - needs a T-flag opcode update
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Legendary Axe II - Some gfx issues, but playable now
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Madoo Granzort - Graphics issues because VPC renderer is not using new frame timing
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Magical Chase - Freezes when starting 1st level - waiting for DMA completion IRQ?
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MML Demo - Echo channels are too loud (equal volume!)
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Naxat Open - Crashes when you start new game
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New Adventure Island - Minor gfx issues
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Night Creatures - Some gfx glitches
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Outrun - 'Sea Wind' sample when selecting music is not playing ...... raster issues, now more annoying than before
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Outrun - 'Sea Wind' sample when selecting music is not playing, raster issues, music slows when paused
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Populous - Game freezes on starting new game - *** NEEDS BATTERY SAVERAM ***
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Power Drift - Timing glitch... starting new game runs slower than it should
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R-Type - Funky corruption after killing final boss in Stage 8
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Raiden - Sprites and BG get out of sync with current timing
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Side Arms - Video timing issue - bottom arms display shouldn't be visible
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Sinistron - Raster effect errors
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Soldier Blade - Freezes about 5 minutes in. Always in the same spot, fortunately. I have a savestate.
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Strip Fighter - Minor gfx glitches (status area)
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Thunder Blade - After beating the 1st 3d area, game semi-freezes
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Turrican - Playable, issues with opening sequence
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Valkyrie No Densetsu - Freezes in title sequence
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Valkyrie No Densetsu - Boots now, but with pretty severe issues
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Stuff I Fixed That's Not In Other Docs:
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@ -55,4 +55,6 @@ Stuff I Fixed That's Not In Other Docs:
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Cross Wiber, Jackie Chan, Jigoku Meguri, New Adventure Island, World Beach volley
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- Actually, I'm not at all convinced there's always a 1-instruction delay on the I-flag.
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But this fixes several games; clearly there are delays in some scenarios. But it's not clear
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to me that this delay is ALWAYS present.
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to me that this delay is ALWAYS present.
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+ Writing to the SATB location register of the VDC requests a VRAM->SAT DMA even if the SAT DMA
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bit is disabled in the DCR.
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@ -88,6 +88,9 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
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cpu.Execute(455-hblankCycles);
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if (InActiveDisplay == false && DmaRequested)
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RunDmaForScanline();
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ScanLine++;
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ActiveLine++;
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RCRCount++;
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@ -107,12 +110,20 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
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public void UpdateSpriteAttributeTable()
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{
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if (/*(Registers[DCR] & 0x10) != 0 &&*/ Registers[SATB] <= 0x7F00)
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if ((SatDmaRequested || (Registers[DCR] & 0x10) != 0) && Registers[SATB] <= 0x7F00)
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{
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SatDmaRequested = false;
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for (int i = 0; i < 256; i++)
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{
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SpriteAttributeTable[i] = VRAM[Registers[SATB] + i];
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}
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if ((Registers[DCR] & 1) > 0)
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{
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Console.WriteLine("FIRING SATB DMA COMPLETION IRQ");
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StatusByte |= StatusVramSatDmaComplete;
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cpu.IRQ1Assert = true;
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}
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}
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}
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@ -158,7 +169,7 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
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}
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}
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private static byte[] heightTable = { 16, 32, 64, 64 };
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private byte[] heightTable = { 16, 32, 64, 64 };
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public void RenderSpritesScanline()
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{
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@ -17,6 +17,8 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
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public ushort[] Registers = new ushort[0x20];
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public ushort ReadBuffer;
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public byte StatusByte;
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private bool DmaRequested;
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private bool SatDmaRequested;
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public ushort IncrementWidth
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{
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@ -160,7 +162,10 @@ break;
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Console.WriteLine("VCR / END POSITION: "+(Registers[VCR] & 0xFF));
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break;
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case LENR: // Initiate DMA transfer
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InitiateDMA();
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DmaRequested = true;
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break;
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case SATB:
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SatDmaRequested = true;
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break;
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}
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}
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@ -192,9 +197,10 @@ break;
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return 0;
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}
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private void InitiateDMA()
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private void RunDmaForScanline()
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{
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Console.WriteLine("DOING DMA ********************************************* ");
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DmaRequested = false;
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int advanceSource = (Registers[DCR] & 4) == 0 ? +1 : -1;
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int advanceDest = (Registers[DCR] & 8) == 0 ? +1 : -1;
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@ -206,6 +212,13 @@ break;
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Registers[DESR] = (ushort)(Registers[DESR] + advanceDest);
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Registers[SOUR] = (ushort)(Registers[SOUR] + advanceSource);
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}
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if ((Registers[DCR] & 2) > 0)
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{
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Console.WriteLine("FIRE VRAM-VRAM DMA COMPLETE IRQ");
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StatusByte |= StatusVramVramDmaComplete;
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cpu.IRQ1Assert = true;
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}
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}
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public void UpdatePatternData(ushort addr)
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