173 lines
6.6 KiB
C
173 lines
6.6 KiB
C
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/*==========================================================================;
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*
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* Copyright (C) 1995-2000 Microsoft Corporation. All Rights Reserved.
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*
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* File: ddi.h
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* Content: Direct3D DDI encapsulation implementations
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*
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*
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***************************************************************************/
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#ifndef _DDIBASE_H
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#define _DDIBASE_H
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#include "d3ditype.h"
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#include "d3dhalp.h"
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extern char *HrToStr(HRESULT hr);
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class CD3DBase;
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struct _D3D8_DEVICEDATA;
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typedef struct _D3D8_DEVICEDATA D3D8_DEVICEDATA;
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class CSurface;
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class D3DFE_PROCESSVERTICES;
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class CBaseTexture;
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class CDriverVertexBuffer;
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struct CVStream;
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struct CVIndexStream;
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class CBaseSurface;
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class CResource;
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class CBuffer;
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/////////////////////////////////////////////////////////////////////////////
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// //
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// CD3DDDI //
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// //
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/////////////////////////////////////////////////////////////////////////////
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class CD3DDDI
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{
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protected:
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// DrawIndexedStream params
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UINT m_StartIndex;
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UINT m_MinVertexIndex;
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UINT m_NumVertices;
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int m_BaseVertexIndex;
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public:
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CD3DDDI();
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virtual ~CD3DDDI();
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//++++++++++++++ Interface which the PSGP is using ++++++++++++++++++++++++
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//
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// These functions are used when vertices are processed by D3D pipeline.
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// Internal driver buffers
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// D3D has three driver buffers: TL buffer, which contains primitive
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// vertices, command buffer, where drawing commands are recorded, and clip
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// buffer, where vertices, generated by clipper, are recorded. D3D maintains
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// count of vertices in the TL buffer (TL buffer vertex count) and an index
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// of the first vertex of the current primitive (primitive base). When a
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// drawing command is recorded, D3D records the current primitive base.
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// All drawing commands expect that vertices have already been copied to the
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// TL buffer (excluding DrawClippedPrim).
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//
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// If a flush occurs during recording a command, vertex buffer is not
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// flushed, because m_bWithinPrimitive is set to TRUE. So primitive base
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// and TL vertex count stay the same.
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//
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// When PSGP processes and clip a non-indexed primitive, it should update
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// primitive base and TL vertex count, using SkipVertices and
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// MovePrimitiveBase functions. AddVertices is not used, because DrawPrim()
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// functions calls AddVertices and MovePrimitiveBase inself.
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// Draw unclipped part of non-indexed primitive
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//
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// Parameters:
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// pv->lpvOut - pointer to the first vertex
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// pv->primType - primitiveType;
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// pv->dwNumVertices - vertexCount
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// pv->dwNumPrimitives - number of primitives
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// Remarks:
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// This function is used when vertices are processed by D3D pipeline.
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// The function inserts a new command to the command buffer.
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// Primitive base is increased by the number of vertices.
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// TL buffer vertex count is increased by the number of vertices.
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//
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virtual void DrawPrim(D3DFE_PROCESSVERTICES* pv) = 0;
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// Draw unclipped part of an indexed primitive
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//
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// Parameters:
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// pv->lpvOut - pointer to the first vertex of the whole
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// primitive
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// pv->primType - primitiveType
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// pv->dwNumPrimitives - number of primitives
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// pv->lpwIndices - pointer to the first index
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// pv->dwNumIndices - number of indices
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// pv->dwIndexSize - size of an index in bytes (2 or 4)
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// Remarks:
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// Vertices must be already copied to the TL buffer.
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// The function inserts a new command to the command buffer.
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// Indices are copied to the index buffer. Vertices must be in the TL
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// buffer already.
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// Primitive base and TL buffer vertex count are not changed.
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//
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virtual void DrawIndexPrim(D3DFE_PROCESSVERTICES* pv) = 0;
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// Draw a primitive, generated by clipper
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//
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// Parameters:
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// pv->lpvOut - pointer to the first vertex of the primitive
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// pv->primType - primitiveType
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// pv->dwNumVertices - vertex count
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// pv->dwNumPrimitives - number of primitives
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// Remarks:
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// Vertices are copied to the clipping buffer
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// The function inserts a new command to the command buffer.
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// Primitive base and TL buffer vertex count are not changed.
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//
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virtual void DrawClippedPrim(D3DFE_PROCESSVERTICES* pv) = 0;
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// Increase TL buffer vertex count
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//
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// The function addes the number of vertices to the current primitive
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// base. So when it is called several times without moving the primitive
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// base, only the last call will have effect.
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// This function should be called after vertices are added to the
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// TL buffer, but before a drawing function is called.
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//
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virtual void AddVertices(UINT NumVertices) = 0;
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// Decrease TL buffer vertex count
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//
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// This function should be called after vertices are added to the
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// TL buffer, but before a drawing function is called.
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//
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virtual void SubVertices(UINT NumVertices) = 0;
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// Update primitive base
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//
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// It should be called when some vertices are skipped because of clipping.
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// NumVertices could be negative,
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//
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virtual void MovePrimitiveBase(int NumVertices) = 0;
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// Update primitive base and TL buffer vertex count
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//
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// Call this function when some vertices in the vertex buffer are used
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// for clipping and should be skipped
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//
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virtual void SkipVertices(DWORD NumVertices) = 0;
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void SetIndexedPrimParams(UINT StartIndex, UINT MinIndex, UINT NumVertices,
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UINT BaseVertexIndex)
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{
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m_StartIndex = StartIndex;
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m_MinVertexIndex = MinIndex;
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m_NumVertices = NumVertices;
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m_BaseVertexIndex = BaseVertexIndex;
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}
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// Returns offset in bytes of the start vertex of the current primitive in
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// the current TL stream
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virtual DWORD GetCurrentPrimBase() {return 0;}
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//-------------------- End PSGP functions ---------------------------------
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};
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typedef CD3DDDI *LPD3DDDI;
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#endif /* _D3DIBASE_H */
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