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refine timing of swapbuffers more. fixes 098 regression in devil survivor 2.

This commit is contained in:
zeromus 2012-07-03 17:32:34 +00:00
parent 0910dc507a
commit 5cda370b9d
2 changed files with 9 additions and 9 deletions
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4
desmume/src/FIFO.cpp
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@ -228,7 +228,9 @@ void GFX_FIFOsend(u8 cmd, u32 param)
//if a matrix op is entering the pipeline, do accounting for it
//(this is tested by wild west, which will jam a few ops in the fifo and then wait for the matrix stack to be
//un-busy so it can read back the current matrix stack position)
//un-busy so it can read back the current matrix stack position).
//it is definitely only pushes and pops which set this flag.
//seems like it would be less work in the HW to make a counter than do cmps on all the command bytes, so maybe we're even doing it right.
if(IsMatrixStackCommand(cmd))
gxFIFO.matrix_stack_op_size++;

14
desmume/src/NDSSystem.cpp
View File

@ -1641,18 +1641,16 @@ static void execHardware_hstart()
//check whether we'll need to fire vblank irqs
if(T1ReadWord(MMU.ARM9_REG, 4) & 0x8) MMU.reg_IF_pending[ARMCPU_ARM9] |= (1<<IRQ_BIT_LCD_VBLANK);
if(T1ReadWord(MMU.ARM7_REG, 4) & 0x8) MMU.reg_IF_pending[ARMCPU_ARM7] |= (1<<IRQ_BIT_LCD_VBLANK);
}
else if(nds.VCount==193)
{
//for our purposes, this block of code is the ending of the swapbuffers process.
//it happens 392 system clocks after vblank. thats 392/6=65 dots -- not one scanline.
//however, for convenience, we're deferring it to this scanline until we find that it needs to be more detailed
//OR - until we restore proper emulation of 3d command timing.
//this is important for the character select in Dragon Ball Kai - Ultimate Butouden
//it seems if you allow the 3d to begin before the vblank, then it will get interrupted and not complete.
//the game needs to pick up the gxstat reg busy as clear after it finishes processing vblank.
//therefore, this can't happen until sometime after vblank
//therefore, this can't happen until sometime after vblank.
//devil survivor 2 will have screens get stuck if this is on any other scanline.
//obviously 192 is the right choice.
gfx3d_VBlankSignal();
//this isnt important for any known game, but it would be nice to prove it.
NDS_RescheduleGXFIFO(392*2);
}
//write the new vcount