OrdinaryMagician/vkdoom_m
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- Added a technique to try and minimize input lag with vsync enabled: Two

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surfaces are alternately locked for read-only access each frame, forcing
  the driver to stop buffering more than one frame at a time. The input lag
  on my system doesn't seem to be as bad as it once was (I can no longer
  see it obviously with my naked eye), but turning antilag on "feels"
  slightly more responsive. The cvar d3d_antilag turns this technique on and
  off. See <http://www.xyzw.de/c120.html> for more details.


SVN r1870 (trunk)
This commit is contained in:
Randy Heit 2009-09-22 20:17:54 +00:00
commit 11fbc57178
3 changed files with 70 additions and 8 deletions
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65
src/win32/fb_d3d9.cpp
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@ -246,6 +246,7 @@ CUSTOM_CVAR(Bool, vid_hw2d, true, CVAR_NOINITCALL)
BorderNeedRefresh = SB_state = screen->GetPageCount();
}
CVAR(Bool, d3d_antilag, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
CVAR(Int, d3d_showpacks, 0, 0)
CVAR(Bool, vid_hwaalines, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
@ -276,6 +277,8 @@ D3DFB::D3DFB (int width, int height, bool fullscreen)
{
Shaders[i] = NULL;
}
BlockSurface[0] = NULL;
BlockSurface[1] = NULL;
FBFormat = D3DFMT_UNKNOWN;
PalFormat = D3DFMT_UNKNOWN;
VSync = vid_vsync;
@ -531,6 +534,7 @@ bool D3DFB::CreateResources()
{
return false;
}
CreateBlockSurfaces();
return true;
}
@ -640,6 +644,8 @@ void D3DFB::ReleaseDefaultPoolItems()
SAFE_RELEASE( InitialWipeScreen );
SAFE_RELEASE( VertexBuffer );
SAFE_RELEASE( IndexBuffer );
SAFE_RELEASE( BlockSurface[0] );
SAFE_RELEASE( BlockSurface[1] );
}
//==========================================================================
@ -674,10 +680,35 @@ bool D3DFB::Reset ()
{
return false;
}
CreateBlockSurfaces();
SetInitialState();
return true;
}
//==========================================================================
//
// D3DFB :: CreateBlockSurfaces
//
// Create blocking surfaces for antilag. It's okay if these can't be
// created; antilag just won't work.
//
//==========================================================================
void D3DFB::CreateBlockSurfaces()
{
BlockNum = 0;
if (SUCCEEDED(D3DDevice->CreateOffscreenPlainSurface(16, 16, D3DFMT_A8R8G8B8,
D3DPOOL_DEFAULT, &BlockSurface[0], 0)))
{
if (FAILED(D3DDevice->CreateOffscreenPlainSurface(16, 16, D3DFMT_A8R8G8B8,
D3DPOOL_DEFAULT, &BlockSurface[1], 0)))
{
BlockSurface[0]->Release();
BlockSurface[0] = NULL;
}
}
}
//==========================================================================
//
// D3DFB :: KillNativePals
@ -921,10 +952,7 @@ void D3DFB::Update ()
DrawRateStuff();
DrawPackedTextures(d3d_showpacks);
EndBatch(); // Make sure all batched primitives are drawn.
DoWindowedGamma();
D3DDevice->EndScene();
D3DDevice->Present(NULL, NULL, NULL, NULL);
InScene = false;
Flip();
}
In2D = 0;
return;
@ -987,10 +1015,7 @@ void D3DFB::Update ()
Draw3DPart(In2D <= 1);
if (In2D == 0)
{
DoWindowedGamma();
D3DDevice->EndScene();
D3DDevice->Present(NULL, NULL, NULL, NULL);
InScene = false;
Flip();
}
BlitCycles.Unclock();
@ -1000,6 +1025,30 @@ void D3DFB::Update ()
UpdatePending = false;
}
void D3DFB::Flip()
{
assert(InScene);
DoWindowedGamma();
D3DDevice->EndScene();
// Attempt to counter input lag.
if (d3d_antilag && BlockSurface[0] != NULL)
{
D3DLOCKED_RECT lr;
volatile int dummy;
D3DDevice->ColorFill(BlockSurface[BlockNum], NULL, D3DCOLOR_ARGB(0xFF,0,0x20,0x50));
BlockNum ^= 1;
if (!FAILED((BlockSurface[BlockNum]->LockRect(&lr, NULL, D3DLOCK_READONLY))))
{
dummy = *(int *)lr.pBits;
BlockSurface[BlockNum]->UnlockRect();
}
}
D3DDevice->Present(NULL, NULL, NULL, NULL);
InScene = false;
}
bool D3DFB::PaintToWindow ()
{
HRESULT hr;