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Convert D3DFVF_XYZRHW into D3DFVF_XYZW #188

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Convert D3DFVF_XYZRHW into D3DFVF_XYZW #188

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ee3a7f1
Added config setting DdrawConvertHomogeneousW.
dkollmann May 4, 2023
3c1ee96
Use the actual viewport size for the view matrix.
dkollmann May 4, 2023
ec96e85
Center geometry on screen.
dkollmann May 4, 2023
0562725
The geometry is visible now.
dkollmann May 4, 2023
22ab3bf
Fixed geometry having reversed depth.
dkollmann May 4, 2023
15f2241
The rendering of geometry is correct now.
dkollmann May 4, 2023
74d067a
Disabled unnecessary changes on states.
dkollmann May 4, 2023
b147e75
Merge branch 'master' into reverse_xyzrhw
elishacloud May 11, 2023
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2 changes: 2 additions & 0 deletions Settings/Settings.h
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@
visit(DdrawOverrideStencilFormat) \
visit(DdrawResolutionHack) \
visit(DdrawUseDirect3D9Ex) \
visit(DdrawConvertHomogeneousW) \
visit(DdrawUseNativeResolution) \
visit(DdrawEnableMouseHook) \
visit(DdrawHookSystem32) \
Expand Down Expand Up @@ -209,6 +210,7 @@ struct CONFIG
bool DdrawIntegerScalingClamp = false; // Scales the screen by an integer value to help preserve video quality
bool DdrawMaintainAspectRatio = false; // Keeps the current DirectDraw aspect ratio when overriding the game's resolution
bool DdrawUseDirect3D9Ex = false; // Use Direct3D9Ex extensions for Dd7to9
bool DdrawConvertHomogeneousW = false; // Convert primites using D3DFVF_XYZRHW to D3DFVF_XYZW.
bool DdrawUseNativeResolution = false; // Uses the current screen resolution for Dd7to9
DWORD DdrawClippedWidth = 0; // Used to scaled Direct3d9 to use this width when using Dd7to9
DWORD DdrawClippedHeight = 0; // Used to scaled Direct3d9 to use this height when using Dd7to9
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64 changes: 64 additions & 0 deletions ddraw/IDirect3DDeviceX.cpp
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Expand Up @@ -338,6 +338,28 @@ HRESULT m_IDirect3DDeviceX::SetTransform(D3DTRANSFORMSTATETYPE dtstTransformStat
break;
}

if (Config.DdrawConvertHomogeneousW)
{
if (dtstTransformStateType == D3DTS_VIEW)
{
D3DVIEWPORT9 Viewport9;
if (SUCCEEDED((*d3d9Device)->GetViewport(&Viewport9)))
{
ZeroMemory(lpD3DMatrix, sizeof(_D3DMATRIX));
lpD3DMatrix->_11 = 2.0f / (float)Viewport9.Width;
lpD3DMatrix->_22 = -2.0f / (float)Viewport9.Height;
lpD3DMatrix->_33 = 1.0f;
lpD3DMatrix->_41 = -1.0f; // translate X
lpD3DMatrix->_42 = 1.0f; // translate Y
lpD3DMatrix->_44 = 1.0f;
}
}
else
{
return D3D_OK;
}
}

HRESULT hr = (*d3d9Device)->SetTransform(dtstTransformStateType, lpD3DMatrix);

if (SUCCEEDED(hr))
Expand Down Expand Up @@ -1943,6 +1965,28 @@ HRESULT m_IDirect3DDeviceX::SetRenderState(D3DRENDERSTATETYPE dwRenderStateType,

if (Config.Dd7to9)
{
if(Config.DdrawConvertHomogeneousW)
{
// ReSharper disable once CppIncompleteSwitchStatement
switch(dwRenderStateType)
{
case D3DRS_CULLMODE:
//dwRenderState = D3DCULL_NONE;
break;

case D3DRS_LIGHTING:
dwRenderState = FALSE;
break;

case D3DRS_CLIPPLANEENABLE:
//dwRenderState = 0;
break;

default:
break;
}
}

// Check for device interface
if (FAILED(CheckInterface(__FUNCTION__, true)))
{
Expand Down Expand Up @@ -2352,6 +2396,26 @@ HRESULT m_IDirect3DDeviceX::DrawIndexedPrimitive(D3DPRIMITIVETYPE dptPrimitiveTy
}
else
{
const UINT stride = GetVertexStride(dwVertexTypeDesc);

// Handle PositionT
if((dwVertexTypeDesc & D3DFVF_XYZRHW) != 0 && Config.DdrawConvertHomogeneousW)
{
UINT8 *vertex = (UINT8*)lpVertices;

for (UINT x = 0; x < dwVertexCount; x++)
{
float *pos = (float*) vertex;

pos[3] = 1.0f;
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Don't you lose information here if rhw is != 1?
It's not used for many things, but at least for perspective-correct texture mapping and some exotic stuff like fog.

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The documentation read that the use of W is undefined here, and not seen as part of the position vector. For me it made no difference if I had it or not. So it is probably better to just remove it then.

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@Trass3r Trass3r May 5, 2023 •
edited
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Yeah not sure if they use the W at all in this mode, also they also say it's "designed for, and can only be used with, the programmable vertex pipeline."
https://learn.microsoft.com/en-us/windows/win32/direct3d9/d3dfvf

So the input coordinates are in screen space and your view matrix transforms it back into clip space?

https://gamedev.net/forums/topic/582097-difference-between-d3dfvf_xyzw-and-d3dfvf_xyzrhw/4705397/

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The SetTransform function overrides the game matrices with its own, when the mode is active.

// Replace the matrix with one that handles D3DFVF_XYZRHW geometry
D3DVIEWPORT9 Viewport9;
if(SUCCEEDED((*d3d9Device)->GetViewport(&Viewport9)))
{
	ZeroMemory(lpD3DMatrix, sizeof(_D3DMATRIX));
	lpD3DMatrix->_11 = 2.0f / (float)Viewport9.Width;
	lpD3DMatrix->_22 = -2.0f / (float)Viewport9.Height;
	lpD3DMatrix->_33 = 1.0f;
	lpD3DMatrix->_41 = -1.0f;  // translate X
	lpD3DMatrix->_42 = 1.0f;   // translate Y
	lpD3DMatrix->_44 = 1.0f;
}

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I know.
I guess an identity viewport matrix would also suffice but not sure about this mode.
https://learn.microsoft.com/en-us/windows/win32/dxtecharts/the-direct3d-transformation-pipeline


vertex += stride;
}

// Update the FVF
dwVertexTypeDesc = (dwVertexTypeDesc & ~D3DFVF_XYZRHW) | D3DFVF_XYZW;
}

// Set fixed function vertex type
(*d3d9Device)->SetFVF(dwVertexTypeDesc);

Expand Down