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Constant Buffers

What are constant buffers

Constant buffer or "cbuffers" as known by HLSL is a buffer/struct which is stored in GPU memory and can be accessed within your shader. Once the file is included you should be able to access the cbuffer like a regular variable within your shader.

An example of its usage can be seen below:

VS { #include "common/vertex.hlsl" #include "common.fxc" // Contains PerViewConstantBuffer_t // // Main // PixelInput MainVs( INSTANCED_SHADER_PARAMS( VS_INPUT i ) ) { PixelInput o = ProcessVertex( i ); o.vPositionWs.z += sin(g_flTime) * 5.0f; // wiggle return FinalizeVertex( o ); } }

BakedLightingConstantBuffer_t

Usage: #include "baked_lighting_constants.fxc"

Type Field Note
float4 g_vLightmapUvScale

PerViewConstantBuffer_t

Usage: #include "common.fxc"

Type Field Note
float4x4 g_matWorldToProjection
float4x4 g_matProjectionToWorld
float4x4 g_matWorldToView
float4x4 g_matViewToProjection
float4 g_vInvProjRow3
float4 g_vClipPlane0
float g_flToneMapScalarLinear
float g_flLightMapScalar
float g_flEnvMapScalar
float g_flToneMapScalarGamma
float3 g_vCameraPositionWs The world position of the camera
float g_flViewportMinZ
float3 g_vCameraDirWs The current camera direction
float g_flViewportMaxZ
float3 g_vCameraUpDirWs
float g_flTime The time since the client has connected
float3 g_vDepthPsToVsConversion
float g_flNearPlane NearZ
float g_flFarPlane FarZ
float g_flLightBinnerFarPlane
float2 g_vInvViewportSize
float2 g_vViewportToGBufferRatio
float2 g_vMorphTextureAtlasSize
float4 g_vInvGBufferSize
float g_flOOTransformTextureWidth
float g_flOOTransformTextureHeight
float2 g_vViewportOffset
float2 g_vViewportSize
float2 g_vRenderTargetSize
float g_flFogBlendToBackground
float g_flHenyeyGreensteinCoeff
float3 g_vFogColor
float g_flNegFogStartOverFogRange
float g_flInvFogRange
float g_flFogMaxDensity
float g_flFogExponent
float g_flMod2xIdentity
float2 g_bRoughnessParams
bool g_bUseRoughnessCone
bool g_bUseRoughnessEllipse
float g_bStereoEnabled
float g_flStereoCameraIndex
float3 g_vMiddleEyePositionWs
float g_flPad2 Padding for alignment, unused
float4x4 g_matWorldToProjectionMultiview[ 2 ]
float4 g_vCameraPositionWsMultiview[ 2 ]
float4 g_vFrameBufferCopyInvSizeAndUvScale
float4 g_vCameraAngles
float4 g_vWorldToCameraOffset
float4 g_vWorldToCameraOffsetMultiview[ 2 ]
float4 g_vPerViewConstantExtraData0
float4 g_vPerViewConstantExtraData1
float4 g_vPerViewConstantExtraData2
float4 g_vPerViewConstantExtraData3
float4x4 m_matPrevProjectionToWorld

PerViewLightingConstantBuffer_t

Usage: #include "common.fxc"

Type Field Note
float g_flInvPointLightTextureWidth
float g_flInvSpotLightTextureWidth
float g_flInvLightTransformTextureWidth
float g_flInvLightTextureHeight
float4 g_vLightBinCounts
float2 g_vLowResDeferredLightingTextureDim
float2 g_vLowResDeferredLightingTextureInvDim
float3 g_vToolsAmbientLighting
float g_flSSAOEnabled
float3 g_vIrradAtlasInvSize
float g_flIrradGlobalLightingFactor
float4 g_vGlobalLightingSHRed
float4 g_vGlobalLightingSHGreen
float4 g_vGlobalLightingSHBlue
float3 g_vRayleighScatteringCoeff
float g_flMieScatteringEccentricity
float3 g_vMieScatteringCoeff
float g_flMieForwardScatteringRatio
float3 g_vSpecularCubeMapScale
float g_flDefaultEnvMapIndex
float4 g_vLightCookieSheetSequenceAndSizes
float3 g_vLpvBoxMinCascade0
float g_flLpvBrightnessScale
float3 g_vLpvInvBoxDimCascade0
float2 g_vLpvInvCoeffTextureDim

PerLayerConstantBuffer_t

Usage: #include "common.fxc"

Type Field Note
float4 g_vWireframeColor The wireframe color for the current rendering layer(mat_wireframe N)

PerBatchLightProbeVolumeConstantBuffer_t

Usage: #include "light_probe_volume.fxc"

Type Field Note
float4x3 g_matLightProbeVolumeWorldToLocal
float4 g_vLightProbeVolumeLayer0TextureMin
float4 g_vLightProbeVolumeLayer0TextureMax
float4 g_vLightProbeVolumeColor

MSAASampleOffsetConstantBuffer_t

Usage: #include "msaa_offsets.fxc"

Type Field Note
float4 g_vMSAASampleOffsets[16]
uint g_nMSAASampleCount

ReflectionMapDescriptor_t

Usage: #include "reflection.fxc"

Type Field Note
float4x4 g_matReflectionWorldToProjection
float4 g_vReflectionPlane
float4 g_vReflectionRenderTargetRectangle

SFMLightsConstantBuffer_t

Usage: #include "sfm_lighting_nocombos.fxc"

Type Field Note
float g_SFMLight_Count
float g_SFMLight_VolumetricOffset
float g_SFMLight_PadZ
float g_SFMLight_PadW
float2 g_SFMLight_ShadowSampleDelta0
float2 g_SFMLight_ShadowSampleDelta1
float2 g_SFMLight_ShadowSampleDelta2
float2 g_SFMLight_ShadowSampleDelta3
float4 g_SFMLight_Position_Roundness[ 32 ]
float4 g_SFMLight_Direction_ShadowFilterSize[ 32 ]
float4 g_SFMLight_Color_ShadowTexIndex[ 32 ]
float4 g_SFMLight_Attenuation_CookieTexIndex[ 32 ]
float4 g_SFMLight_DepthParams_SpotFalloff[ 32 ]
float4 g_SFMLight_GoboTexCoords[ 32 ]
float4 g_SFMLight_PadXYZ_AmbientIntensity[ 32 ]
float4x4 g_SFMLight_ViewProj[ 32 ]

SkyConstantBuffer_t

Usage: #include "sky.fxc"

Type Field Note
float4x3 g_matSkyOsToWs Convert from Sky Object Space to Sky World Space
float4x3 g_matSkyWsToOs Convert from Sky World Space to Sky Object Space

SunLightShaderParamsCB

Usage: #include "sun_shadowing.fxc"

Type Field Note
float4 g_vSunLightColor Current sun color
float3 g_vSunLightDir Current sun direction
float g_flSunNormalizedRadius
float g_flSunShadowingInvShadowTextureWidth
float g_flSunShadowingInvShadowTextureHeight
float g_flSunShadowingHalfInvShadowTextureWidth
float g_flSunShadowingHalfInvShadowTextureHeight
float g_flSunShadowingShadowTextureWidth
float g_flSunShadowingShadowTextureHeight
float g_flSunShadowingSplitLerpFactorBase
float g_flSunShadowingSplitLerpFactorInvRange
float g_flSunShadowingZLerpFactorBase
float g_flSunShadowingZLerpFactorRange
float4x4 g_matWorldToShadowTexMatrices[4]
float4 g_vCascadeAtlasUVOffsets[4]
float4 g_flCascadeViewShadowBiasScales[4]
int g_nSunShadowCascadeCount

PerViewConstantBufferVR_t

Usage: #include "vr_common.fxc"

Type Field Note
bool g_bVolumetricFogEnabled
bool g_bGradientFogEnabled
bool g_bCubemapFogEnabled
bool g_bSphericalVignetteEnabled
bool g_bAmbientOcclusionProxiesEnabled
float4 g_vAoProxyDownres
float g_flExcitationAmount Xen animations
float g_flDepressionAmount Xen animations
float4 g_vWindDirection Current wind direction
float g_flWindSpeed Current wind speed
float4 g_vInteractionProjectionOrigin
float4 g_vInteractionVolumeInvExtents
float4 g_vInteractionTriggerVolumeInvMins
float4 g_vInteractionTriggerVolumeWorldToVolumeScale
float4 g_vGradientFogBiasAndScale
float4 m_vGradientFogExponents
float4 g_vGradientFogColor_Opacity
float4 g_vGradientFogCullingParams
float g_flCubeFogOffset
float g_flCubeFogScale
float g_flCubeFogBias
float g_flCubeFogExponent
float g_flCubeFogHeightOffset
float g_flCubeFogHeightScale
float g_flCubeFogHeightExponent
float g_flCubeMapSizeLog2
float4x4 g_matvCubeFogSkyWsToOs
float4 g_vCubeFogCullingParams
float4 g_vSphericalVignetteBiasAndScale
float4 g_vSphericalVignetteOrigin_Exponent
float4 g_vSphericalVignetteColor_Opacity
float g_flVolFogNearClipPlane
float g_flVolFogClipPlaneRange
float4 g_vVolFogDitherScaleBias
float4 g_vVolFogPostWorldToFrustumScale
float4 g_vVolFogPostWorldToFrustumBias
float4x4 g_mVolFogFromWorld[ 2 ]
float4 g_vHighPrecisionLightingOffsetWs

HighQualityShadowsConstantBuffer_t

Usage: #include "vr_lighting.fxc"

Type Field Note
int4 g_nHighQualityShadowsCount
int4 g_vHighQualityShadowsIndices[4]
float4 g_vHighQualityLightSize[4]
float4x4 g_matHighQualityWorldToShadow[4]
float4 g_vHighQualityLightPosition[4]
float4 g_vHighQualityShadowRegion

PerViewLightingConstantBufferVr_t

Usage: #include "vr_per_view_lighting_constants.fxc"

Type Field Note
int g_nNumLights Amount of lights to iterate within the other fields, (g_vLightParams, g_vLightPosition_flInvRadius, etc)
int4 g_vMultiviewData
int g_nNumViews
int g_nNumSubiews
int g_nNumTotalMultiviews
int4 g_vMultiviewViewAndSubviewIndexArray[4]
int4 g_vLightParams[128]
float4 g_vLightPosition_flInvRadius[128]
float4 g_vLightColor[128]
float4 g_vLightFalloffParams[128]
float4 g_vLightDirection[128]
float4 g_vSpotLightInnerOuterConeCosines[128]
float4x4 g_matWorldToShadow[128]
float4 g_vShadow3x3PCFTermC0
float4 g_vShadow3x3PCFTermC1
float4 g_vShadow3x3PCFTermC2
float4 g_vShadow3x3PCFTermC3
float4 g_vToolsAmbientLightingVr
float4 g_vLightBinCameraPositionWs
float4 g_vLightBinCameraDirWs
float g_flLightBinCameraNearZ
float g_flLightBinCameraFarZ
float4x4 g_matLightBinViewProj
float4 g_vMultiviewScaleBias[4]
float4 g_vMultiviewClipEdge0[4]
float4 g_vMultiviewClipEdge1[4]
float g_flNumViews
float g_flOoNumViews
float g_flNumSubiews
float g_flOoNumSubviews
float g_flNumTotalMultiviews
float g_flOoNumTotalMultiviews
float g_flVrLuminanceOffset
float g_flVrLuminanceScale
float g_fDisableDirectionalLightmaps
float4 g_vScreenSpaceDitherParams
float4x4 g_matWorldToLightCookie[128]
float4 g_vSpotLightShadowOffsetScale[128]
float4 g_vSpotLightShadowBounds[128]
float4 g_vLightProjectiveDepthToLinearDepth[128]
float4 g_vUnlitShadowColor
float4 g_vAmbientLightingSH[3]
float4 g_vLightIndexData[128]
float4 g_vSunLightIndexData
float4 g_vAmbientOcclusionProxyLightPositions[4]
float4 g_vAmbientOcclusionProxyLightConeAngles
float4 g_vAmbientOcclusionProxyLightStrengths
float4 g_vAmbientOcclusionProxyAmbientStrength
float4 g_vCubemapNormalizationParams

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