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Negate the game's reverse Z implementation.

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This commit is contained in:
Skyth
2024-11-08 20:18:54 +03:00
parent ec5c51f54c
commit 329d51885d
4 changed files with 48 additions and 38 deletions
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81
UnleashedRecomp/gpu/video.cpp
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@@ -91,6 +91,7 @@ static GuestSurface* g_depthStencil;
static RenderFramebuffer* g_framebuffer;
static RenderViewport g_viewport(0.0f, 0.0f, 1280.0f, 720.0f);
static bool g_halfPixel = true;
static uint32_t g_zFunc;
static PipelineState g_pipelineState;
static SharedConstants g_sharedConstants;
static RenderSamplerDesc g_samplerDescs[16];
@@ -662,6 +663,36 @@ static RenderBlend ConvertBlendMode(uint32_t blendMode)
}
}
// The game renders the main scene with reverse Z where the viewport's minDepth and maxDepth
// values are swapped. We negate this to improve compatibility with old hardware.
static RenderComparisonFunction ConvertComparisonFunc(uint32_t cmpFunc, bool reverseZ)
{
switch (cmpFunc)
{
case D3DCMP_LESS:
return reverseZ ? RenderComparisonFunction::GREATER : RenderComparisonFunction::LESS;
case D3DCMP_LESSEQUAL:
return reverseZ ? RenderComparisonFunction::GREATER_EQUAL : RenderComparisonFunction::LESS_EQUAL;
case D3DCMP_GREATER:
return reverseZ ? RenderComparisonFunction::LESS : RenderComparisonFunction::GREATER;
case D3DCMP_GREATEREQUAL:
return reverseZ ? RenderComparisonFunction::LESS_EQUAL : RenderComparisonFunction::GREATER_EQUAL;
case D3DCMP_NEVER:
return RenderComparisonFunction::NEVER;
case D3DCMP_EQUAL:
return RenderComparisonFunction::EQUAL;
case D3DCMP_NOTEQUAL:
return RenderComparisonFunction::NOT_EQUAL;
case D3DCMP_ALWAYS:
return RenderComparisonFunction::ALWAYS;
default:
assert(false && "Unknown comparison function");
return RenderComparisonFunction::NEVER;
}
}
static RenderBlendOperation ConvertBlendOp(uint32_t blendOp)
{
switch (blendOp)
@@ -740,41 +771,8 @@ static void ProcSetRenderState(const RenderCommand& cmd)
}
case D3DRS_ZFUNC:
{
RenderComparisonFunction comparisonFunc;
switch (value)
{
case D3DCMP_NEVER:
comparisonFunc = RenderComparisonFunction::NEVER;
break;
case D3DCMP_LESS:
comparisonFunc = RenderComparisonFunction::LESS;
break;
case D3DCMP_EQUAL:
comparisonFunc = RenderComparisonFunction::EQUAL;
break;
case D3DCMP_LESSEQUAL:
comparisonFunc = RenderComparisonFunction::LESS_EQUAL;
break;
case D3DCMP_GREATER:
comparisonFunc = RenderComparisonFunction::GREATER;
break;
case D3DCMP_NOTEQUAL:
comparisonFunc = RenderComparisonFunction::NOT_EQUAL;
break;
case D3DCMP_GREATEREQUAL:
comparisonFunc = RenderComparisonFunction::GREATER_EQUAL;
break;
case D3DCMP_ALWAYS:
comparisonFunc = RenderComparisonFunction::ALWAYS;
break;
default:
assert(false && "Unknown comparison function");
comparisonFunc = RenderComparisonFunction::NEVER;
break;
}
SetDirtyValue(g_dirtyStates.pipelineState, g_pipelineState.zFunc, comparisonFunc);
g_zFunc = value;
SetDirtyValue(g_dirtyStates.pipelineState, g_pipelineState.zFunc, ConvertComparisonFunc(value, g_viewport.minDepth >= g_viewport.maxDepth));
break;
}
case D3DRS_ALPHAREF:
@@ -1543,6 +1541,7 @@ static GuestSurface* CreateSurface(uint32_t width, uint32_t height, uint32_t for
surface->width = width;
surface->height = height;
surface->format = desc.format;
surface->guestFormat = format;
surface->sampleCount = desc.multisampling.sampleCount;
if (desc.multisampling.sampleCount != RenderSampleCount::COUNT_1 && desc.format == RenderFormat::D32_FLOAT)
@@ -1590,6 +1589,12 @@ static void FlushViewport()
viewport.height *= height / 720.0f;
}
if (viewport.minDepth >= viewport.maxDepth)
{
viewport.minDepth = 1.0f - viewport.minDepth;
viewport.maxDepth = 1.0f - viewport.maxDepth;
}
commandList->setViewports(viewport);
g_dirtyStates.viewport = false;
@@ -1873,7 +1878,8 @@ static void ProcClear(const RenderCommand& cmd)
if (!canClearInOnePass)
SetFramebuffer(nullptr, g_depthStencil, true);
commandList->clearDepth(true, args.z);
// The condition here is done by the game to determine reverse Z.
commandList->clearDepth(true, g_depthStencil->guestFormat == D3DFMT_D24FS8 ? (1.0f - args.z) : args.z);
}
}
@@ -1909,6 +1915,9 @@ static void ProcSetViewport(const RenderCommand& cmd)
SetDirtyValue<float>(g_dirtyStates.viewport, g_viewport.maxDepth, args.maxDepth);
g_dirtyStates.scissorRect |= g_dirtyStates.viewport;
// Update Z function as it's dependent on reverse Z.
SetDirtyValue(g_dirtyStates.pipelineState, g_pipelineState.zFunc, ConvertComparisonFunc(g_zFunc, args.minDepth >= args.maxDepth));
}
static void SetTexture(GuestDevice* device, uint32_t index, GuestTexture* texture)