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diff --git a/public/shaderapi/ishadershadow.h b/public/shaderapi/ishadershadow.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//===========================================================================//
+
+#ifndef ISHADERSHADOW_H
+#define ISHADERSHADOW_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "shaderapi/shareddefs.h"
+#include <materialsystem/imaterial.h>
+
+
+//-----------------------------------------------------------------------------
+// forward declarations
+//-----------------------------------------------------------------------------
+class CMeshBuilder;
+class IMaterialVar;
+struct LightDesc_t; 
+
+
+//-----------------------------------------------------------------------------
+// important enumerations
+//-----------------------------------------------------------------------------
+enum ShaderDepthFunc_t 
+{ 
+	SHADER_DEPTHFUNC_NEVER,
+	SHADER_DEPTHFUNC_NEARER,
+	SHADER_DEPTHFUNC_EQUAL,
+	SHADER_DEPTHFUNC_NEAREROREQUAL,
+	SHADER_DEPTHFUNC_FARTHER,
+	SHADER_DEPTHFUNC_NOTEQUAL,
+	SHADER_DEPTHFUNC_FARTHEROREQUAL,
+	SHADER_DEPTHFUNC_ALWAYS
+};
+
+enum ShaderBlendFactor_t
+{
+	SHADER_BLEND_ZERO,
+	SHADER_BLEND_ONE,
+	SHADER_BLEND_DST_COLOR,
+	SHADER_BLEND_ONE_MINUS_DST_COLOR,
+	SHADER_BLEND_SRC_ALPHA,
+	SHADER_BLEND_ONE_MINUS_SRC_ALPHA,
+	SHADER_BLEND_DST_ALPHA,
+	SHADER_BLEND_ONE_MINUS_DST_ALPHA,
+	SHADER_BLEND_SRC_ALPHA_SATURATE,
+	SHADER_BLEND_SRC_COLOR,
+	SHADER_BLEND_ONE_MINUS_SRC_COLOR
+};
+
+enum ShaderBlendOp_t
+{
+	SHADER_BLEND_OP_ADD,
+	SHADER_BLEND_OP_SUBTRACT,
+	SHADER_BLEND_OP_REVSUBTRACT,
+	SHADER_BLEND_OP_MIN,
+	SHADER_BLEND_OP_MAX
+};
+
+enum ShaderAlphaFunc_t
+{
+	SHADER_ALPHAFUNC_NEVER,
+	SHADER_ALPHAFUNC_LESS,
+	SHADER_ALPHAFUNC_EQUAL,
+	SHADER_ALPHAFUNC_LEQUAL,
+	SHADER_ALPHAFUNC_GREATER,
+	SHADER_ALPHAFUNC_NOTEQUAL,
+	SHADER_ALPHAFUNC_GEQUAL,
+	SHADER_ALPHAFUNC_ALWAYS
+};
+
+enum ShaderStencilFunc_t 
+{ 
+	SHADER_STENCILFUNC_NEVER = 0,
+	SHADER_STENCILFUNC_LESS,
+	SHADER_STENCILFUNC_EQUAL,
+	SHADER_STENCILFUNC_LEQUAL,
+	SHADER_STENCILFUNC_GREATER,
+	SHADER_STENCILFUNC_NOTEQUAL,
+	SHADER_STENCILFUNC_GEQUAL,
+	SHADER_STENCILFUNC_ALWAYS
+};
+
+enum ShaderStencilOp_t 
+{ 
+	SHADER_STENCILOP_KEEP = 0,
+	SHADER_STENCILOP_ZERO,
+	SHADER_STENCILOP_SET_TO_REFERENCE,
+	SHADER_STENCILOP_INCREMENT_CLAMP,
+	SHADER_STENCILOP_DECREMENT_CLAMP,
+	SHADER_STENCILOP_INVERT,
+	SHADER_STENCILOP_INCREMENT_WRAP,
+	SHADER_STENCILOP_DECREMENT_WRAP,
+};
+
+enum ShaderTexChannel_t
+{
+	SHADER_TEXCHANNEL_COLOR = 0,
+	SHADER_TEXCHANNEL_ALPHA
+};
+
+enum ShaderPolyModeFace_t
+{
+	SHADER_POLYMODEFACE_FRONT,
+	SHADER_POLYMODEFACE_BACK,
+	SHADER_POLYMODEFACE_FRONT_AND_BACK,
+};
+
+enum ShaderPolyMode_t
+{
+	SHADER_POLYMODE_POINT,
+	SHADER_POLYMODE_LINE,
+	SHADER_POLYMODE_FILL
+};
+
+enum ShaderTexArg_t
+{
+	SHADER_TEXARG_TEXTURE = 0,
+	SHADER_TEXARG_VERTEXCOLOR,
+	SHADER_TEXARG_SPECULARCOLOR,
+	SHADER_TEXARG_CONSTANTCOLOR,
+	SHADER_TEXARG_PREVIOUSSTAGE,
+	SHADER_TEXARG_NONE,
+	SHADER_TEXARG_ZERO,
+	SHADER_TEXARG_TEXTUREALPHA,
+	SHADER_TEXARG_INVTEXTUREALPHA,
+	SHADER_TEXARG_ONE,
+};
+
+enum ShaderTexOp_t
+{
+	// DX5 shaders support these
+	SHADER_TEXOP_MODULATE = 0,
+	SHADER_TEXOP_MODULATE2X,
+	SHADER_TEXOP_MODULATE4X,
+	SHADER_TEXOP_SELECTARG1,
+	SHADER_TEXOP_SELECTARG2,
+	SHADER_TEXOP_DISABLE,
+
+	// DX6 shaders support these
+	SHADER_TEXOP_ADD,
+	SHADER_TEXOP_SUBTRACT,
+	SHADER_TEXOP_ADDSIGNED2X,
+	SHADER_TEXOP_BLEND_CONSTANTALPHA,
+	SHADER_TEXOP_BLEND_TEXTUREALPHA,
+	SHADER_TEXOP_BLEND_PREVIOUSSTAGEALPHA,
+	SHADER_TEXOP_MODULATECOLOR_ADDALPHA,
+	SHADER_TEXOP_MODULATEINVCOLOR_ADDALPHA,
+
+	// DX7
+	SHADER_TEXOP_DOTPRODUCT3
+};
+
+enum ShaderTexGenParam_t
+{
+	SHADER_TEXGENPARAM_OBJECT_LINEAR,
+	SHADER_TEXGENPARAM_EYE_LINEAR,
+	SHADER_TEXGENPARAM_SPHERE_MAP,
+	SHADER_TEXGENPARAM_CAMERASPACEREFLECTIONVECTOR,
+	SHADER_TEXGENPARAM_CAMERASPACENORMAL
+};
+
+enum ShaderDrawBitField_t
+{
+	SHADER_DRAW_POSITION			= 0x0001,
+	SHADER_DRAW_NORMAL				= 0x0002,
+	SHADER_DRAW_COLOR				= 0x0004,
+	SHADER_DRAW_SPECULAR			= 0x0008,
+
+	SHADER_DRAW_TEXCOORD0			= 0x0010,
+	SHADER_DRAW_TEXCOORD1			= 0x0020,
+	SHADER_DRAW_TEXCOORD2			= 0x0040,
+	SHADER_DRAW_TEXCOORD3			= 0x0080,
+
+	SHADER_DRAW_LIGHTMAP_TEXCOORD0	= 0x0100,
+	SHADER_DRAW_LIGHTMAP_TEXCOORD1	= 0x0200,
+	SHADER_DRAW_LIGHTMAP_TEXCOORD2	= 0x0400,
+	SHADER_DRAW_LIGHTMAP_TEXCOORD3	= 0x0800,
+
+	SHADER_DRAW_SECONDARY_TEXCOORD0	= 0x1000,
+	SHADER_DRAW_SECONDARY_TEXCOORD1	= 0x2000,
+	SHADER_DRAW_SECONDARY_TEXCOORD2	= 0x4000,
+	SHADER_DRAW_SECONDARY_TEXCOORD3	= 0x8000,
+
+	SHADER_TEXCOORD_MASK = SHADER_DRAW_TEXCOORD0 | SHADER_DRAW_TEXCOORD1 | 
+							SHADER_DRAW_TEXCOORD2 | SHADER_DRAW_TEXCOORD3,
+
+	SHADER_LIGHTMAP_TEXCOORD_MASK = SHADER_DRAW_LIGHTMAP_TEXCOORD0 | 
+									SHADER_DRAW_LIGHTMAP_TEXCOORD1 | 
+									SHADER_DRAW_LIGHTMAP_TEXCOORD2 | 
+									SHADER_DRAW_LIGHTMAP_TEXCOORD3,
+
+	SHADER_SECONDARY_TEXCOORD_MASK = SHADER_DRAW_SECONDARY_TEXCOORD0 | 
+									SHADER_DRAW_SECONDARY_TEXCOORD1 | 
+									SHADER_DRAW_SECONDARY_TEXCOORD2 | 
+									SHADER_DRAW_SECONDARY_TEXCOORD3,
+};
+
+
+enum ShaderFogMode_t
+{
+	SHADER_FOGMODE_DISABLED = 0,
+	SHADER_FOGMODE_OO_OVERBRIGHT,
+	SHADER_FOGMODE_BLACK,
+	SHADER_FOGMODE_GREY,
+	SHADER_FOGMODE_FOGCOLOR,
+	SHADER_FOGMODE_WHITE,
+	SHADER_FOGMODE_NUMFOGMODES
+};
+
+enum ShaderMaterialSource_t
+{
+	SHADER_MATERIALSOURCE_MATERIAL = 0,
+	SHADER_MATERIALSOURCE_COLOR1,
+	SHADER_MATERIALSOURCE_COLOR2,
+};
+
+
+// m_ZBias has only two bits in ShadowState_t, so be careful extending this enum
+enum PolygonOffsetMode_t
+{
+	SHADER_POLYOFFSET_DISABLE		= 0x0,
+	SHADER_POLYOFFSET_DECAL		= 0x1,
+	SHADER_POLYOFFSET_SHADOW_BIAS	= 0x2,
+	SHADER_POLYOFFSET_RESERVED		= 0x3	// Reserved for future use
+};
+
+
+//-----------------------------------------------------------------------------
+// The Shader interface versions
+//-----------------------------------------------------------------------------
+#define SHADERSHADOW_INTERFACE_VERSION	"ShaderShadow010"
+
+
+//-----------------------------------------------------------------------------
+// the shader API interface (methods called from shaders)
+//-----------------------------------------------------------------------------
+abstract_class IShaderShadow
+{
+public:
+	// Sets the default *shadow* state
+	virtual void SetDefaultState() = 0;
+
+	// Methods related to depth buffering
+	virtual void DepthFunc( ShaderDepthFunc_t depthFunc ) = 0;
+	virtual void EnableDepthWrites( bool bEnable ) = 0;
+	virtual void EnableDepthTest( bool bEnable ) = 0;
+	virtual void EnablePolyOffset( PolygonOffsetMode_t nOffsetMode ) = 0;
+
+	// These methods for controlling stencil are obsolete and stubbed to do nothing.  Stencil
+	// control is via the shaderapi/material system now, not part of the shadow state.
+	// Methods related to stencil
+	virtual void EnableStencil( bool bEnable ) = 0;
+	virtual void StencilFunc( ShaderStencilFunc_t stencilFunc ) = 0;
+	virtual void StencilPassOp( ShaderStencilOp_t stencilOp ) = 0;
+	virtual void StencilFailOp( ShaderStencilOp_t stencilOp ) = 0;
+	virtual void StencilDepthFailOp( ShaderStencilOp_t stencilOp ) = 0;
+	virtual void StencilReference( int nReference ) = 0;
+	virtual void StencilMask( int nMask ) = 0;
+	virtual void StencilWriteMask( int nMask ) = 0;
+
+	// Suppresses/activates color writing 
+	virtual void EnableColorWrites( bool bEnable ) = 0;
+	virtual void EnableAlphaWrites( bool bEnable ) = 0;
+
+	// Methods related to alpha blending
+	virtual void EnableBlending( bool bEnable ) = 0;
+	virtual void BlendFunc( ShaderBlendFactor_t srcFactor, ShaderBlendFactor_t dstFactor ) = 0;
+	// More below...
+
+	// Alpha testing
+	virtual void EnableAlphaTest( bool bEnable ) = 0;
+	virtual void AlphaFunc( ShaderAlphaFunc_t alphaFunc, float alphaRef /* [0-1] */ ) = 0;
+
+	// Wireframe/filled polygons
+	virtual void PolyMode( ShaderPolyModeFace_t face, ShaderPolyMode_t polyMode ) = 0;
+
+	// Back face culling
+	virtual void EnableCulling( bool bEnable ) = 0;
+
+	// constant color + transparency
+	virtual void EnableConstantColor( bool bEnable ) = 0;
+
+	// Indicates the vertex format for use with a vertex shader
+	// The flags to pass in here come from the VertexFormatFlags_t enum
+	// If pTexCoordDimensions is *not* specified, we assume all coordinates
+	// are 2-dimensional
+	virtual void VertexShaderVertexFormat( unsigned int nFlags, 
+			int nTexCoordCount, int* pTexCoordDimensions, int nUserDataSize ) = 0;
+
+	// Pixel and vertex shader methods
+	virtual void SetVertexShader( const char* pFileName, int nStaticVshIndex ) = 0;
+	virtual	void SetPixelShader( const char* pFileName, int nStaticPshIndex = 0 ) = 0;
+
+	// Indicates we're going to light the model
+	virtual void EnableLighting( bool bEnable ) = 0;
+
+	// Enables specular lighting (lighting has also got to be enabled)
+	virtual void EnableSpecular( bool bEnable ) = 0;
+
+	// Convert from linear to gamma color space on writes to frame buffer.
+	virtual void EnableSRGBWrite( bool bEnable ) = 0;
+
+	// Convert from gamma to linear on texture fetch.
+	virtual void EnableSRGBRead( Sampler_t sampler, bool bEnable ) = 0;
+
+	// Activate/deactivate skinning. Indexed blending is automatically
+	// enabled if it's available for this hardware. When blending is enabled,
+	// we allocate enough room for 3 weights (max allowed)
+	virtual void EnableVertexBlend( bool bEnable ) = 0;
+
+	// per texture unit stuff
+	virtual void OverbrightValue( TextureStage_t stage, float value ) = 0;
+	virtual void EnableTexture( Sampler_t sampler, bool bEnable ) = 0;
+	virtual void EnableTexGen( TextureStage_t stage, bool bEnable ) = 0;
+	virtual void TexGen( TextureStage_t stage, ShaderTexGenParam_t param ) = 0;
+
+	// alternate method of specifying per-texture unit stuff, more flexible and more complicated
+	// Can be used to specify different operation per channel (alpha/color)...
+	virtual void EnableCustomPixelPipe( bool bEnable ) = 0;
+	virtual void CustomTextureStages( int stageCount ) = 0;
+	virtual void CustomTextureOperation( TextureStage_t stage, ShaderTexChannel_t channel, 
+		ShaderTexOp_t op, ShaderTexArg_t arg1, ShaderTexArg_t arg2 ) = 0;
+
+	// indicates what per-vertex data we're providing
+	virtual void DrawFlags( unsigned int drawFlags ) = 0;
+
+	// A simpler method of dealing with alpha modulation
+	virtual void EnableAlphaPipe( bool bEnable ) = 0;
+	virtual void EnableConstantAlpha( bool bEnable ) = 0;
+	virtual void EnableVertexAlpha( bool bEnable ) = 0;
+	virtual void EnableTextureAlpha( TextureStage_t stage, bool bEnable ) = 0;
+
+	// GR - Separate alpha blending
+	virtual void EnableBlendingSeparateAlpha( bool bEnable ) = 0;
+	virtual void BlendFuncSeparateAlpha( ShaderBlendFactor_t srcFactor, ShaderBlendFactor_t dstFactor ) = 0;
+	virtual void FogMode( ShaderFogMode_t fogMode ) = 0;
+
+	virtual void SetDiffuseMaterialSource( ShaderMaterialSource_t materialSource ) = 0;
+
+	// Indicates the morph format for use with a vertex shader
+	// The flags to pass in here come from the MorphFormatFlags_t enum
+	virtual void SetMorphFormat( MorphFormat_t flags ) = 0;
+
+	virtual void DisableFogGammaCorrection( bool bDisable ) = 0; //some blending modes won't work properly with corrected fog
+
+	// Alpha to coverage
+	virtual void EnableAlphaToCoverage( bool bEnable ) = 0;
+
+	// Shadow map filtering
+	virtual void SetShadowDepthFiltering( Sampler_t stage ) = 0;
+
+	// More alpha blending state
+	virtual void BlendOp( ShaderBlendOp_t blendOp ) = 0;
+	virtual void BlendOpSeparateAlpha( ShaderBlendOp_t blendOp ) = 0;
+};
+// end class IShaderShadow
+
+
+
+#endif // ISHADERSHADOW_H