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diff --git a/public/shaderapi/shareddefs.h b/public/shaderapi/shareddefs.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: NOTE: This file is for backward compat!
+// We'll get rid of it soon. Most of the contents of this file were moved
+// into shaderpi/ishadershadow.h, shaderapi/ishaderdynamic.h, or
+// shaderapi/shareddefs.h
+//
+// $NoKeywords: $
+//
+//===========================================================================//
+
+#ifndef SHADERAPI_SHAREDDEFS_H
+#define SHADERAPI_SHAREDDEFS_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+//-----------------------------------------------------------------------------
+// Important enumerations
+//-----------------------------------------------------------------------------
+enum ShaderShadeMode_t
+{
+	SHADER_FLAT = 0,
+	SHADER_SMOOTH
+};
+
+enum ShaderTexCoordComponent_t
+{
+	SHADER_TEXCOORD_S = 0,
+	SHADER_TEXCOORD_T,
+	SHADER_TEXCOORD_U
+};
+
+enum ShaderTexFilterMode_t
+{
+	SHADER_TEXFILTERMODE_NEAREST,
+	SHADER_TEXFILTERMODE_LINEAR,
+	SHADER_TEXFILTERMODE_NEAREST_MIPMAP_NEAREST,
+	SHADER_TEXFILTERMODE_LINEAR_MIPMAP_NEAREST,
+	SHADER_TEXFILTERMODE_NEAREST_MIPMAP_LINEAR,
+	SHADER_TEXFILTERMODE_LINEAR_MIPMAP_LINEAR,
+	SHADER_TEXFILTERMODE_ANISOTROPIC
+};
+
+enum ShaderTexWrapMode_t
+{
+	SHADER_TEXWRAPMODE_CLAMP,
+	SHADER_TEXWRAPMODE_REPEAT,
+	SHADER_TEXWRAPMODE_BORDER
+	// MIRROR? - probably don't need it.
+};
+
+
+//-----------------------------------------------------------------------------
+// Sampler + texture stage identifiers
+// NOTE: Texture stages are used only by fixed function shading algorithms
+// Samplers are used to enable and bind textures + by programmable shading algorithms
+//-----------------------------------------------------------------------------
+enum TextureStage_t
+{
+	SHADER_TEXTURE_STAGE0 = 0,
+	SHADER_TEXTURE_STAGE1,
+};
+
+enum Sampler_t
+{
+	SHADER_SAMPLER0 = 0,
+	SHADER_SAMPLER1,
+	SHADER_SAMPLER2,
+	SHADER_SAMPLER3,
+	SHADER_SAMPLER4,
+	SHADER_SAMPLER5,
+	SHADER_SAMPLER6,
+	SHADER_SAMPLER7,
+	SHADER_SAMPLER8,
+	SHADER_SAMPLER9,
+	SHADER_SAMPLER10,
+	SHADER_SAMPLER11,
+	SHADER_SAMPLER12,
+	SHADER_SAMPLER13,
+	SHADER_SAMPLER14,
+	SHADER_SAMPLER15,
+};
+
+//-----------------------------------------------------------------------------
+// Vertex texture sampler identifiers
+//-----------------------------------------------------------------------------
+enum VertexTextureSampler_t
+{
+	SHADER_VERTEXTEXTURE_SAMPLER0 = 0,
+	SHADER_VERTEXTEXTURE_SAMPLER1,
+	SHADER_VERTEXTEXTURE_SAMPLER2,
+	SHADER_VERTEXTEXTURE_SAMPLER3,
+};
+
+
+#if defined( _X360 )
+#define REVERSE_DEPTH_ON_X360 //uncomment to use D3DFMT_D24FS8 with an inverted depth viewport for better performance. Keep this in sync with the same named #define in materialsystem/stdshaders/common_fxc.h
+#endif
+
+#if defined( REVERSE_DEPTH_ON_X360 )
+#define ReverseDepthOnX360() true
+#else
+#define ReverseDepthOnX360() false
+#endif
+
+
+
+#endif // SHADERAPI_SHAREDDEFS_H