// @return see EDecalRenderStage
EDecalRenderStage FDecalRendering::ComputeRenderStage(EShaderPlatform Platform, EDecalBlendMode DecalBlendMode)
{
if (IsMobilePlatform(Platform))
{
return DRS_ForwardShading;
}
switch(DecalBlendMode)
{
case DBM_DBuffer_ColorNormalRoughness:
case DBM_DBuffer_Color:
case DBM_DBuffer_ColorNormal:
case DBM_DBuffer_ColorRoughness:
case DBM_DBuffer_Normal:
case DBM_DBuffer_NormalRoughness:
case DBM_DBuffer_Roughness:
return DRS_BeforeBasePass;
case DBM_Translucent:
case DBM_Stain:
case DBM_Normal:
case DBM_Emissive:
return DRS_BeforeLighting;
case DBM_Volumetric_DistanceFunction:
return DRS_AfterBasePass;
default:
check(0);
}
return DRS_BeforeBasePass;
}
void FForwardShadingSceneRenderer::ConditionalResolveSceneDepth(FRHICommandListImmediate& RHICmdList)
{
FSceneRenderTargets& SceneContext = FSceneRenderTargets::Get(RHICmdList);
SceneContext.ResolveSceneDepthToAuxiliaryTexture(RHICmdList);
#if !PLATFORM_HTML5
auto ShaderPlatform = ViewFamily.GetShaderPlatform();
if (IsMobilePlatform(ShaderPlatform)
&& !IsPCPlatform(ShaderPlatform)) // exclude mobile emulation on PC
{
bool bSceneDepthInAlpha = (SceneContext.GetSceneColor()->GetDesc().Format == PF_FloatRGBA);
bool bOnChipDepthFetch = (GSupportsShaderDepthStencilFetch || (bSceneDepthInAlpha && GSupportsShaderFramebufferFetch));
if (!bOnChipDepthFetch)
{
// Only these features require depth texture
bool bDecals = ViewFamily.EngineShowFlags.Decals && Scene->Decals.Num();
bool bModulatedShadows = ViewFamily.EngineShowFlags.DynamicShadows && GetShadowQuality() > 0 && bModulatedShadowsInUse;
if (bDecals || bModulatedShadows)
{
// Switch target to force hardware flush current depth to texture
FTextureRHIRef DummySceneColor = GSystemTextures.BlackDummy->GetRenderTargetItem().TargetableTexture;
FTextureRHIRef DummyDepthTarget = GSystemTextures.DepthDummy->GetRenderTargetItem().TargetableTexture;
SetRenderTarget(RHICmdList, DummySceneColor, DummyDepthTarget, ESimpleRenderTargetMode::EUninitializedColorClearDepth, FExclusiveDepthStencil::DepthWrite_StencilWrite);
RHICmdList.DiscardRenderTargets(true, true, 0);
}
}
}
#endif //!PLATFORM_HTML5
}
// @return DECAL_RENDERTARGET_COUNT for the shader
uint32 FDecalRendering::ComputeRenderTargetCount(EShaderPlatform Platform, ERenderTargetMode RenderTargetMode)
{
// has to be SceneColor on mobile
check(!IsMobilePlatform(Platform) || RenderTargetMode == RTM_SceneColor);
switch(RenderTargetMode)
{
case RTM_SceneColorAndGBuffer: return 4;
case RTM_SceneColorAndGBufferDepthWrite: return 4;
case RTM_DBuffer: return 3;
case RTM_GBufferNormal: return 1;
case RTM_SceneColor: return 1;
}
return 0;
}
static bool IsBlendModeSupported(EShaderPlatform Platform, EDecalBlendMode DecalBlendMode)
{
if (IsMobilePlatform(Platform))
{
switch (DecalBlendMode)
{
case DBM_Stain: // Modulate
case DBM_Emissive: // Additive
case DBM_Translucent: // Translucent
break;
default:
return false;
}
}
return true;
}
FDecalRendering::ERenderTargetMode FDecalRendering::ComputeRenderTargetMode(EShaderPlatform Platform, EDecalBlendMode DecalBlendMode)
{
if (IsMobilePlatform(Platform))
{
return RTM_SceneColor;
}
switch(DecalBlendMode)
{
case DBM_Translucent:
case DBM_Stain:
return RTM_SceneColorAndGBuffer;
case DBM_Normal:
return RTM_GBufferNormal;
case DBM_Emissive:
return RTM_SceneColor;
case DBM_DBuffer_ColorNormalRoughness:
case DBM_DBuffer_Color:
case DBM_DBuffer_ColorNormal:
case DBM_DBuffer_ColorRoughness:
case DBM_DBuffer_Normal:
case DBM_DBuffer_NormalRoughness:
case DBM_DBuffer_Roughness:
// can be optimized using less MRT when possible
return RTM_DBuffer;
case DBM_Volumetric_DistanceFunction:
return RTM_SceneColorAndGBufferDepthWrite;
}
// add the missing decal blend mode to the switch
check(0);
return RTM_Unknown;
}
