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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//===========================================================================//
+
+#ifndef ISHADERAPI_H
+#define ISHADERAPI_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "mathlib/vector4d.h"
+#include "shaderapi/ishaderdynamic.h"
+#include "shaderapi/IShaderDevice.h"
+#include "materialsystem/deformations.h"
+
+
+//-----------------------------------------------------------------------------
+// forward declarations
+//-----------------------------------------------------------------------------
+class IShaderUtil;
+class IFileSystem;
+class CPixelWriter;
+class CMeshBuilder;
+struct MaterialVideoMode_t;
+class IMesh;
+class IVertexBuffer;
+class IIndexBuffer;
+struct MeshDesc_t;
+enum MaterialCullMode_t;
+class IDataCache;   
+struct MorphWeight_t;
+class IVTFTexture;
+
+
+//-----------------------------------------------------------------------------
+// This must match the definition in playback.cpp!
+//-----------------------------------------------------------------------------
+enum ShaderRenderTarget_t
+{
+	SHADER_RENDERTARGET_BACKBUFFER = -1,
+	SHADER_RENDERTARGET_DEPTHBUFFER = -1,
+	// GR - no RT, used to disable depth buffer
+	SHADER_RENDERTARGET_NONE = -2,
+};
+
+
+//-----------------------------------------------------------------------------
+// This must match the definition in playback.cpp!
+//-----------------------------------------------------------------------------
+typedef int ShaderAPITextureHandle_t;
+#define INVALID_SHADERAPI_TEXTURE_HANDLE 0
+
+
+//-----------------------------------------------------------------------------
+// The state snapshot handle
+//-----------------------------------------------------------------------------
+typedef short StateSnapshot_t;
+
+
+//-----------------------------------------------------------------------------
+// The state snapshot handle
+//-----------------------------------------------------------------------------
+typedef int ShaderDLL_t;
+
+
+//-----------------------------------------------------------------------------
+// Texture creation
+//-----------------------------------------------------------------------------
+enum CreateTextureFlags_t
+{
+	TEXTURE_CREATE_CUBEMAP		       = 0x0001,
+	TEXTURE_CREATE_RENDERTARGET        = 0x0002,
+	TEXTURE_CREATE_MANAGED		       = 0x0004,
+	TEXTURE_CREATE_DEPTHBUFFER	       = 0x0008,
+	TEXTURE_CREATE_DYNAMIC		       = 0x0010,
+	TEXTURE_CREATE_AUTOMIPMAP          = 0x0020,
+	TEXTURE_CREATE_VERTEXTEXTURE       = 0x0040,	// for internal use only	
+	TEXTURE_CREATE_FALLBACK            = 0x0080,	// 360 only
+	TEXTURE_CREATE_NOD3DMEMORY         = 0x0100,	// 360 only
+	TEXTURE_CREATE_SYSMEM              = 0x0200,	// This texture should be alloc'd in the sysmem pool
+	TEXTURE_CREATE_UNUSED4             = 0x0400,	// Dead
+	TEXTURE_CREATE_UNUSED5		       = 0x0800,	// Dead
+	TEXTURE_CREATE_UNFILTERABLE_OK     = 0x1000,
+	TEXTURE_CREATE_CANCONVERTFORMAT    = 0x2000,	// 360 only, allow format conversions at load
+	TEXTURE_CREATE_SRGB                = 0x4000,	// Posix/GL only, for textures which are SRGB-readable
+
+};
+
+
+
+//-----------------------------------------------------------------------------
+// Fill modes
+//-----------------------------------------------------------------------------
+enum ShaderFillMode_t
+{
+	SHADER_FILL_SOLID = 0,
+	SHADER_FILL_WIREFRAME,
+};
+
+
+//-----------------------------------------------------------------------------
+// Rasterization state object
+//-----------------------------------------------------------------------------
+struct ShaderRasterState_t
+{
+	ShaderFillMode_t m_FillMode;
+	MaterialCullMode_t m_CullMode;
+	bool m_bCullEnable : 1;
+	bool m_bDepthBias : 1;
+	bool m_bScissorEnable : 1;
+	bool m_bMultisampleEnable : 1;
+};
+
+
+//-----------------------------------------------------------------------------
+// Used for occlusion queries
+//-----------------------------------------------------------------------------
+DECLARE_POINTER_HANDLE( ShaderAPIOcclusionQuery_t );
+#define INVALID_SHADERAPI_OCCLUSION_QUERY_HANDLE ( (ShaderAPIOcclusionQuery_t)0 )
+
+enum ShaderAPIOcclusionQueryResult_t
+{
+	OCCLUSION_QUERY_RESULT_PENDING	=	-1,
+	OCCLUSION_QUERY_RESULT_ERROR	=	-2
+};
+#define OCCLUSION_QUERY_FINISHED( iQueryResult ) ( ( iQueryResult ) != OCCLUSION_QUERY_RESULT_PENDING )
+
+
+//-----------------------------------------------------------------------------
+// This is what the material system gets to see.
+//-----------------------------------------------------------------------------
+#define SHADERAPI_INTERFACE_VERSION		"ShaderApi030"
+abstract_class IShaderAPI : public IShaderDynamicAPI
+{
+public:
+	//
+	// NOTE: These methods have been ported to DX10
+	//
+
+	// Viewport methods
+	virtual void SetViewports( int nCount, const ShaderViewport_t* pViewports ) = 0;
+	virtual int GetViewports( ShaderViewport_t* pViewports, int nMax ) const = 0;
+
+	// Buffer clearing
+	virtual void ClearBuffers( bool bClearColor, bool bClearDepth, bool bClearStencil, int renderTargetWidth, int renderTargetHeight ) = 0;
+	virtual void ClearColor3ub( unsigned char r, unsigned char g, unsigned char b ) = 0;
+	virtual void ClearColor4ub( unsigned char r, unsigned char g, unsigned char b, unsigned char a ) = 0;
+
+	// Methods related to binding shaders
+	virtual void BindVertexShader( VertexShaderHandle_t hVertexShader ) = 0;
+	virtual void BindGeometryShader( GeometryShaderHandle_t hGeometryShader ) = 0;
+	virtual void BindPixelShader( PixelShaderHandle_t hPixelShader ) = 0;
+
+	// Methods related to state objects
+	virtual void SetRasterState( const ShaderRasterState_t& state ) = 0;
+
+	//
+	// NOTE: These methods have not yet been ported to DX10
+	//
+
+	// Sets the mode...
+	virtual bool SetMode( void* hwnd, int nAdapter, const ShaderDeviceInfo_t &info ) = 0;
+
+	virtual void ChangeVideoMode( const ShaderDeviceInfo_t &info ) = 0;
+
+	// Returns the snapshot id for the shader state
+	virtual StateSnapshot_t	 TakeSnapshot( ) = 0;
+
+	virtual void TexMinFilter( ShaderTexFilterMode_t texFilterMode ) = 0;
+	virtual void TexMagFilter( ShaderTexFilterMode_t texFilterMode ) = 0;
+	virtual void TexWrap( ShaderTexCoordComponent_t coord, ShaderTexWrapMode_t wrapMode ) = 0;
+
+	virtual void CopyRenderTargetToTexture( ShaderAPITextureHandle_t textureHandle ) = 0;
+
+	// Binds a particular material to render with
+	virtual void Bind( IMaterial* pMaterial ) = 0;
+
+	// Flushes any primitives that are buffered
+	virtual void FlushBufferedPrimitives() = 0;
+
+	// Gets the dynamic mesh; note that you've got to render the mesh
+	// before calling this function a second time. Clients should *not*
+	// call DestroyStaticMesh on the mesh returned by this call.
+	virtual IMesh* GetDynamicMesh( IMaterial* pMaterial, int nHWSkinBoneCount, bool bBuffered = true,
+		IMesh* pVertexOverride = 0, IMesh* pIndexOverride = 0) = 0;
+	virtual IMesh* GetDynamicMeshEx( IMaterial* pMaterial, VertexFormat_t vertexFormat, int nHWSkinBoneCount, 
+		bool bBuffered = true, IMesh* pVertexOverride = 0, IMesh* pIndexOverride = 0 ) = 0;
+
+	// Methods to ask about particular state snapshots
+	virtual bool IsTranslucent( StateSnapshot_t id ) const = 0;
+	virtual bool IsAlphaTested( StateSnapshot_t id ) const = 0;
+	virtual bool UsesVertexAndPixelShaders( StateSnapshot_t id ) const = 0;
+	virtual bool IsDepthWriteEnabled( StateSnapshot_t id ) const = 0;
+
+	// Gets the vertex format for a set of snapshot ids
+	virtual VertexFormat_t ComputeVertexFormat( int numSnapshots, StateSnapshot_t* pIds ) const = 0;
+
+	// What fields in the vertex do we actually use?
+	virtual VertexFormat_t ComputeVertexUsage( int numSnapshots, StateSnapshot_t* pIds ) const = 0;
+
+	// Begins a rendering pass
+	virtual void BeginPass( StateSnapshot_t snapshot ) = 0;
+
+	// Renders a single pass of a material
+	virtual void RenderPass( int nPass, int nPassCount ) = 0;
+
+	// Set the number of bone weights
+	virtual void SetNumBoneWeights( int numBones ) = 0;
+
+	// Sets the lights
+	virtual void SetLight( int lightNum, const LightDesc_t& desc ) = 0;
+
+	// Lighting origin for the current model
+	virtual void SetLightingOrigin( Vector vLightingOrigin ) = 0;
+
+	virtual void SetAmbientLight( float r, float g, float b ) = 0;
+	virtual void SetAmbientLightCube( Vector4D cube[6] ) = 0;
+
+	// The shade mode
+	virtual void ShadeMode( ShaderShadeMode_t mode ) = 0;
+
+	// The cull mode
+	virtual void CullMode( MaterialCullMode_t cullMode ) = 0;
+
+	// Force writes only when z matches. . . useful for stenciling things out
+	// by rendering the desired Z values ahead of time.
+	virtual void ForceDepthFuncEquals( bool bEnable ) = 0;
+
+	// Forces Z buffering to be on or off
+	virtual void OverrideDepthEnable( bool bEnable, bool bDepthEnable ) = 0;
+
+	virtual void SetHeightClipZ( float z ) = 0; 
+	virtual void SetHeightClipMode( enum MaterialHeightClipMode_t heightClipMode ) = 0; 
+
+	virtual void SetClipPlane( int index, const float *pPlane ) = 0;
+	virtual void EnableClipPlane( int index, bool bEnable ) = 0;
+	
+	// Put all the model matrices into vertex shader constants.
+	virtual void SetSkinningMatrices() = 0;
+
+	// Returns the nearest supported format
+	virtual ImageFormat GetNearestSupportedFormat( ImageFormat fmt, bool bFilteringRequired = true ) const = 0;
+	virtual ImageFormat GetNearestRenderTargetFormat( ImageFormat fmt ) const = 0;
+
+	// When AA is enabled, render targets are not AA and require a separate
+	// depth buffer.
+	virtual bool DoRenderTargetsNeedSeparateDepthBuffer() const = 0;
+
+	// Texture management methods
+	// For CreateTexture also see CreateTextures below
+	virtual ShaderAPITextureHandle_t CreateTexture( 
+		int width, 
+		int height,
+		int depth,
+		ImageFormat dstImageFormat, 
+		int numMipLevels, 
+		int numCopies, 
+		int flags, 
+		const char *pDebugName,
+		const char *pTextureGroupName ) = 0;
+
+	virtual void DeleteTexture( ShaderAPITextureHandle_t textureHandle ) = 0;
+
+	virtual ShaderAPITextureHandle_t CreateDepthTexture( 
+		ImageFormat renderTargetFormat, 
+		int width, 
+		int height, 
+		const char *pDebugName,
+		bool bTexture ) = 0;
+
+	virtual bool IsTexture( ShaderAPITextureHandle_t textureHandle ) = 0;
+	virtual bool IsTextureResident( ShaderAPITextureHandle_t textureHandle ) = 0;
+
+	// Indicates we're going to be modifying this texture
+	// TexImage2D, TexSubImage2D, TexWrap, TexMinFilter, and TexMagFilter
+	// all use the texture specified by this function.
+	virtual void ModifyTexture( ShaderAPITextureHandle_t textureHandle ) = 0;
+
+	virtual void TexImage2D(
+		int level,
+		int cubeFaceID,
+		ImageFormat dstFormat,
+		int zOffset,
+		int width,
+		int height,
+		ImageFormat srcFormat, 
+		bool bSrcIsTiled,		// NOTE: for X360 only
+		void *imageData ) = 0;
+
+	virtual void TexSubImage2D( 
+		int level, 
+		int cubeFaceID, 
+		int xOffset, 
+		int yOffset, 
+		int zOffset, 
+		int width, 
+		int height,
+		ImageFormat srcFormat, 
+		int srcStride, 
+		bool bSrcIsTiled,		// NOTE: for X360 only
+		void *imageData ) = 0;
+	
+	virtual void TexImageFromVTF( IVTFTexture* pVTF, int iVTFFrame ) = 0;
+
+	// An alternate (and faster) way of writing image data
+	// (locks the current Modify Texture). Use the pixel writer to write the data
+	// after Lock is called
+	// Doesn't work for compressed textures 
+	virtual bool TexLock( int level, int cubeFaceID, int xOffset, int yOffset, 
+		int width, int height, CPixelWriter& writer ) = 0;
+	virtual void TexUnlock( ) = 0;
+
+	// These are bound to the texture
+	virtual void TexSetPriority( int priority ) = 0;
+
+	// Sets the texture state
+	virtual void BindTexture( Sampler_t sampler, ShaderAPITextureHandle_t textureHandle ) = 0;
+
+	// Set the render target to a texID.
+	// Set to SHADER_RENDERTARGET_BACKBUFFER if you want to use the regular framebuffer.
+	// Set to SHADER_RENDERTARGET_DEPTHBUFFER if you want to use the regular z buffer.
+	virtual void SetRenderTarget( ShaderAPITextureHandle_t colorTextureHandle = SHADER_RENDERTARGET_BACKBUFFER, 
+		ShaderAPITextureHandle_t depthTextureHandle = SHADER_RENDERTARGET_DEPTHBUFFER ) = 0;
+	
+	// stuff that isn't to be used from within a shader
+	virtual void ClearBuffersObeyStencil( bool bClearColor, bool bClearDepth ) = 0;
+	virtual void ReadPixels( int x, int y, int width, int height, unsigned char *data, ImageFormat dstFormat ) = 0;
+	virtual void ReadPixels( Rect_t *pSrcRect, Rect_t *pDstRect, unsigned char *data, ImageFormat dstFormat, int nDstStride ) = 0;
+
+	virtual void FlushHardware() = 0;
+
+	// Use this to begin and end the frame
+	virtual void BeginFrame() = 0;
+	virtual void EndFrame() = 0;
+
+	// Selection mode methods
+	virtual int  SelectionMode( bool selectionMode ) = 0;
+	virtual void SelectionBuffer( unsigned int* pBuffer, int size ) = 0;
+	virtual void ClearSelectionNames( ) = 0;
+	virtual void LoadSelectionName( int name ) = 0;
+	virtual void PushSelectionName( int name ) = 0;
+	virtual void PopSelectionName() = 0;
+
+	// Force the hardware to finish whatever it's doing
+	virtual void ForceHardwareSync() = 0;
+
+	// Used to clear the transition table when we know it's become invalid.
+	virtual void ClearSnapshots() = 0;
+
+	virtual void FogStart( float fStart ) = 0;
+	virtual void FogEnd( float fEnd ) = 0;
+	virtual void SetFogZ( float fogZ ) = 0;	
+	// Scene fog state.
+	virtual void SceneFogColor3ub( unsigned char r, unsigned char g, unsigned char b ) = 0;
+	virtual void GetSceneFogColor( unsigned char *rgb ) = 0;
+	virtual void SceneFogMode( MaterialFogMode_t fogMode ) = 0;
+
+	// Can we download textures?
+	virtual bool CanDownloadTextures() const = 0;
+
+	virtual void ResetRenderState( bool bFullReset = true ) = 0;
+
+	// We use smaller dynamic VBs during level transitions, to free up memory
+	virtual int  GetCurrentDynamicVBSize( void ) = 0;
+	virtual void DestroyVertexBuffers( bool bExitingLevel = false ) = 0;
+
+	virtual void EvictManagedResources() = 0;
+
+	// Level of anisotropic filtering
+	virtual void SetAnisotropicLevel( int nAnisotropyLevel ) = 0;
+
+	// For debugging and building recording files. This will stuff a token into the recording file,
+	// then someone doing a playback can watch for the token.
+	virtual void SyncToken( const char *pToken ) = 0;
+
+	// Setup standard vertex shader constants (that don't change)
+	// This needs to be called anytime that overbright changes.
+	virtual void SetStandardVertexShaderConstants( float fOverbright ) = 0;
+
+	//
+	// Occlusion query support
+	//
+	
+	// Allocate and delete query objects.
+	virtual ShaderAPIOcclusionQuery_t CreateOcclusionQueryObject( void ) = 0;
+	virtual void DestroyOcclusionQueryObject( ShaderAPIOcclusionQuery_t ) = 0;
+
+	// Bracket drawing with begin and end so that we can get counts next frame.
+	virtual void BeginOcclusionQueryDrawing( ShaderAPIOcclusionQuery_t ) = 0;
+	virtual void EndOcclusionQueryDrawing( ShaderAPIOcclusionQuery_t ) = 0;
+
+	// OcclusionQuery_GetNumPixelsRendered
+	//	Get the number of pixels rendered between begin and end on an earlier frame.
+	//	Calling this in the same frame is a huge perf hit!
+	// Returns iQueryResult:
+	//	iQueryResult >= 0					-	iQueryResult is the number of pixels rendered
+	//	OCCLUSION_QUERY_RESULT_PENDING		-	query results are not available yet
+	//	OCCLUSION_QUERY_RESULT_ERROR		-	query failed
+	// Use OCCLUSION_QUERY_FINISHED( iQueryResult ) to test if query finished.
+	virtual int OcclusionQuery_GetNumPixelsRendered( ShaderAPIOcclusionQuery_t hQuery, bool bFlush = false ) = 0;
+
+	virtual void SetFlashlightState( const FlashlightState_t &state, const VMatrix &worldToTexture ) = 0;
+
+	virtual void ClearVertexAndPixelShaderRefCounts() = 0;
+	virtual void PurgeUnusedVertexAndPixelShaders() = 0;
+
+	// Called when the dx support level has changed
+	virtual void DXSupportLevelChanged() = 0;
+
+	// By default, the material system applies the VIEW and PROJECTION matrices	to the user clip
+	// planes (which are specified in world space) to generate projection-space user clip planes
+	// Occasionally (for the particle system in hl2, for example), we want to override that
+	// behavior and explictly specify a View transform for user clip planes. The PROJECTION
+	// will be mutliplied against this instead of the normal VIEW matrix.
+	virtual void EnableUserClipTransformOverride( bool bEnable ) = 0;
+	virtual void UserClipTransform( const VMatrix &worldToView ) = 0;
+
+	// ----------------------------------------------------------------------------------
+	// Everything after this point added after HL2 shipped.
+	// ----------------------------------------------------------------------------------
+
+	// What fields in the morph do we actually use?
+	virtual MorphFormat_t ComputeMorphFormat( int numSnapshots, StateSnapshot_t* pIds ) const = 0;
+
+	// Set the render target to a texID.
+	// Set to SHADER_RENDERTARGET_BACKBUFFER if you want to use the regular framebuffer.
+	// Set to SHADER_RENDERTARGET_DEPTHBUFFER if you want to use the regular z buffer.
+	virtual void SetRenderTargetEx( int nRenderTargetID, 
+		ShaderAPITextureHandle_t colorTextureHandle = SHADER_RENDERTARGET_BACKBUFFER, 
+		ShaderAPITextureHandle_t depthTextureHandle = SHADER_RENDERTARGET_DEPTHBUFFER ) = 0;
+
+	virtual void CopyRenderTargetToTextureEx( ShaderAPITextureHandle_t textureHandle, int nRenderTargetID, Rect_t *pSrcRect = NULL, Rect_t *pDstRect = NULL ) = 0;
+	virtual void CopyTextureToRenderTargetEx( int nRenderTargetID, ShaderAPITextureHandle_t textureHandle, Rect_t *pSrcRect = NULL, Rect_t *pDstRect = NULL ) = 0;
+
+	// For dealing with device lost in cases where SwapBuffers isn't called all the time (Hammer)
+	virtual void HandleDeviceLost() = 0;
+
+	virtual void EnableLinearColorSpaceFrameBuffer( bool bEnable ) = 0;
+
+	// Lets the shader know about the full-screen texture so it can 
+	virtual void SetFullScreenTextureHandle( ShaderAPITextureHandle_t h ) = 0;
+
+	// Rendering parameters control special drawing modes withing the material system, shader
+	// system, shaders, and engine. renderparm.h has their definitions.
+	virtual void SetFloatRenderingParameter(int parm_number, float value) = 0;
+	virtual void SetIntRenderingParameter(int parm_number, int value) = 0;
+	virtual void SetVectorRenderingParameter(int parm_number, Vector const &value) = 0;
+
+	virtual float GetFloatRenderingParameter(int parm_number) const = 0;
+	virtual int GetIntRenderingParameter(int parm_number) const = 0;
+	virtual Vector GetVectorRenderingParameter(int parm_number) const = 0;
+
+	virtual void SetFastClipPlane( const float *pPlane ) = 0;
+	virtual void EnableFastClip( bool bEnable ) = 0;
+
+	// Returns the number of vertices + indices we can render using the dynamic mesh
+	// Passing true in the second parameter will return the max # of vertices + indices
+	// we can use before a flush is provoked and may return different values 
+	// if called multiple times in succession. 
+	// Passing false into the second parameter will return
+	// the maximum possible vertices + indices that can be rendered in a single batch
+	virtual void GetMaxToRender( IMesh *pMesh, bool bMaxUntilFlush, int *pMaxVerts, int *pMaxIndices ) = 0;
+
+	// Returns the max number of vertices we can render for a given material
+	virtual int GetMaxVerticesToRender( IMaterial *pMaterial ) = 0;
+	virtual int GetMaxIndicesToRender( ) = 0;
+
+	// stencil methods
+	virtual void SetStencilEnable(bool onoff) = 0;
+	virtual void SetStencilFailOperation(StencilOperation_t op) = 0;
+	virtual void SetStencilZFailOperation(StencilOperation_t op) = 0;
+	virtual void SetStencilPassOperation(StencilOperation_t op) = 0;
+	virtual void SetStencilCompareFunction(StencilComparisonFunction_t cmpfn) = 0;
+	virtual void SetStencilReferenceValue(int ref) = 0;
+	virtual void SetStencilTestMask(uint32 msk) = 0;
+	virtual void SetStencilWriteMask(uint32 msk) = 0;
+	virtual void ClearStencilBufferRectangle(int xmin, int ymin, int xmax, int ymax, int value) = 0;
+
+	// disables all local lights
+	virtual void DisableAllLocalLights() = 0;
+	virtual int CompareSnapshots( StateSnapshot_t snapshot0, StateSnapshot_t snapshot1 ) = 0;
+
+	virtual IMesh *GetFlexMesh() = 0;
+
+	virtual void SetFlashlightStateEx( const FlashlightState_t &state, const VMatrix &worldToTexture, ITexture *pFlashlightDepthTexture ) = 0;
+
+	virtual bool SupportsMSAAMode( int nMSAAMode ) = 0;
+
+#if defined( _X360 )
+	virtual HXUIFONT OpenTrueTypeFont( const char *pFontname, int tall, int style ) = 0;
+	virtual void CloseTrueTypeFont( HXUIFONT hFont ) = 0;
+	virtual bool GetTrueTypeFontMetrics( HXUIFONT hFont, XUIFontMetrics *pFontMetrics, XUICharMetrics charMetrics[256] ) = 0;
+	// Render a sequence of characters and extract the data into a buffer
+	// For each character, provide the width+height of the font texture subrect,
+	// an offset to apply when rendering the glyph, and an offset into a buffer to receive the RGBA data
+	virtual bool GetTrueTypeGlyphs( HXUIFONT hFont, int numChars, wchar_t *pWch, int *pOffsetX, int *pOffsetY, int *pWidth, int *pHeight, unsigned char *pRGBA, int *pRGBAOffset ) = 0;
+	virtual ShaderAPITextureHandle_t CreateRenderTargetSurface( int width, int height, ImageFormat format, const char *pDebugName, const char *pTextureGroupName ) = 0;
+	virtual void PersistDisplay() = 0;
+	virtual bool PostQueuedTexture( const void *pData, int nSize, ShaderAPITextureHandle_t *pHandles, int nHandles, int nWidth, int nHeight, int nDepth, int nMips, int *pRefCount ) = 0;
+	virtual void *GetD3DDevice() = 0;
+
+	virtual void PushVertexShaderGPRAllocation( int iVertexShaderCount = 64 ) = 0;
+	virtual void PopVertexShaderGPRAllocation( void ) = 0;
+
+	virtual void EnableVSync_360( bool bEnable ) = 0; //360 allows us to bypass vsync blocking up to 60 fps without creating a new device
+#endif
+	
+	virtual bool OwnGPUResources( bool bEnable ) = 0;
+
+	//get fog distances entered with FogStart(), FogEnd(), and SetFogZ()
+	virtual void GetFogDistances( float *fStart, float *fEnd, float *fFogZ ) = 0;
+
+	// Hooks for firing PIX events from outside the Material System...
+	virtual void BeginPIXEvent( unsigned long color, const char *szName ) = 0;
+	virtual void EndPIXEvent() = 0;
+	virtual void SetPIXMarker( unsigned long color, const char *szName ) = 0;
+
+	// Enables and disables for Alpha To Coverage
+	virtual void EnableAlphaToCoverage() = 0;
+	virtual void DisableAlphaToCoverage() = 0;
+
+	// Computes the vertex buffer pointers 
+	virtual void ComputeVertexDescription( unsigned char* pBuffer, VertexFormat_t vertexFormat, MeshDesc_t& desc ) const = 0;
+
+	virtual bool SupportsShadowDepthTextures( void ) = 0;
+
+	virtual void SetDisallowAccess( bool ) = 0;
+	virtual void EnableShaderShaderMutex( bool ) = 0;
+	virtual void ShaderLock() = 0;
+	virtual void ShaderUnlock() = 0;
+
+	virtual ImageFormat GetShadowDepthTextureFormat( void ) = 0;
+
+	virtual bool SupportsFetch4( void ) = 0;
+	virtual void SetShadowDepthBiasFactors( float fShadowSlopeScaleDepthBias, float fShadowDepthBias ) = 0;
+
+// ------------ New Vertex/Index Buffer interface ----------------------------
+	virtual void BindVertexBuffer( int nStreamID, IVertexBuffer *pVertexBuffer, int nOffsetInBytes, int nFirstVertex, int nVertexCount, VertexFormat_t fmt, int nRepetitions = 1 ) = 0;
+	virtual void BindIndexBuffer( IIndexBuffer *pIndexBuffer, int nOffsetInBytes ) = 0;
+	virtual void Draw( MaterialPrimitiveType_t primitiveType, int nFirstIndex, int nIndexCount ) = 0;
+// ------------ End ----------------------------
+
+
+	// Apply stencil operations to every pixel on the screen without disturbing depth or color buffers
+	virtual void PerformFullScreenStencilOperation( void ) = 0;
+
+	virtual void SetScissorRect( const int nLeft, const int nTop, const int nRight, const int nBottom, const bool bEnableScissor ) = 0;
+
+	// nVidia CSAA modes, different from SupportsMSAAMode()
+	virtual bool SupportsCSAAMode( int nNumSamples, int nQualityLevel ) = 0;
+
+	//Notifies the shaderapi to invalidate the current set of delayed constants because we just finished a draw pass. Either actual or not.
+	virtual void InvalidateDelayedShaderConstants( void ) = 0; 
+
+	// Gamma<->Linear conversions according to the video hardware we're running on
+	virtual float GammaToLinear_HardwareSpecific( float fGamma ) const =0;
+	virtual float LinearToGamma_HardwareSpecific( float fLinear ) const =0;
+
+	//Set's the linear->gamma conversion textures to use for this hardware for both srgb writes enabled and disabled(identity)
+	virtual void SetLinearToGammaConversionTextures( ShaderAPITextureHandle_t hSRGBWriteEnabledTexture, ShaderAPITextureHandle_t hIdentityTexture ) = 0;
+
+	virtual ImageFormat GetNullTextureFormat( void ) = 0;
+
+	virtual void BindVertexTexture( VertexTextureSampler_t nSampler, ShaderAPITextureHandle_t textureHandle ) = 0;
+
+	// Enables hardware morphing
+	virtual void EnableHWMorphing( bool bEnable ) = 0;
+
+	// Sets flexweights for rendering
+	virtual void SetFlexWeights( int nFirstWeight, int nCount, const MorphWeight_t* pWeights ) = 0;
+
+	virtual void FogMaxDensity( float flMaxDensity ) = 0;
+
+	// Create a multi-frame texture (equivalent to calling "CreateTexture" multiple times, but more efficient)
+	virtual void CreateTextures( 
+		ShaderAPITextureHandle_t *pHandles,
+		int count,
+		int width, 
+		int height,
+		int depth,
+		ImageFormat dstImageFormat, 
+		int numMipLevels, 
+		int numCopies, 
+		int flags, 
+		const char *pDebugName,
+		const char *pTextureGroupName ) = 0;
+
+	virtual void AcquireThreadOwnership() = 0;
+	virtual void ReleaseThreadOwnership() = 0;
+
+	virtual bool SupportsNormalMapCompression() const { Assert( !"This has all been removed." ); return false; }
+
+	// Only does anything on XBox360. This is useful to eliminate stalls
+	virtual void EnableBuffer2FramesAhead( bool bEnable ) = 0;
+
+	virtual void SetDepthFeatheringPixelShaderConstant( int iConstant, float fDepthBlendScale ) = 0;
+
+	// debug logging
+	// only implemented in some subclasses
+	virtual void PrintfVA( char *fmt, va_list vargs ) = 0;
+	virtual void Printf( PRINTF_FORMAT_STRING const char *fmt, ... ) = 0;
+	virtual float Knob( char *knobname, float *setvalue = NULL ) = 0;
+	// Allows us to override the alpha write setting of a material
+	virtual void OverrideAlphaWriteEnable( bool bEnable, bool bAlphaWriteEnable ) = 0;
+	virtual void OverrideColorWriteEnable( bool bOverrideEnable, bool bColorWriteEnable ) = 0;
+
+	//extended clear buffers function with alpha independent from color
+	virtual void ClearBuffersObeyStencilEx( bool bClearColor, bool bClearAlpha, bool bClearDepth ) = 0;
+
+	// Allows copying a render target to another texture by specifying them both.
+	virtual void CopyRenderTargetToScratchTexture( ShaderAPITextureHandle_t srcRt, ShaderAPITextureHandle_t dstTex, Rect_t *pSrcRect = NULL, Rect_t *pDstRect = NULL ) = 0;
+
+	// Allows locking and unlocking of very specific surface types.
+	virtual void LockRect( void** pOutBits, int* pOutPitch, ShaderAPITextureHandle_t texHandle, int mipmap, int x, int y, int w, int h, bool bWrite, bool bRead ) = 0;
+	virtual void UnlockRect( ShaderAPITextureHandle_t texHandle, int mipmap ) = 0;
+
+	// Set the finest mipmap that can be used for the texture which is currently being modified. 
+	virtual void TexLodClamp( int finest ) = 0;
+
+	// Set the Lod Bias for the texture which is currently being modified. 
+	virtual void TexLodBias( float bias ) = 0;
+	
+	virtual void CopyTextureToTexture( ShaderAPITextureHandle_t srcTex, ShaderAPITextureHandle_t dstTex ) = 0;
+	
+};
+
+
+#endif // ISHADERAPI_H