120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
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#ifndef __SURFACE_PATCH_H__
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#define __SURFACE_PATCH_H__
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/*
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===============================================================================
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Bezier patch surface.
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===============================================================================
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*/
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class idSurface_Patch : public idSurface {
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public:
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idSurface_Patch( void );
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idSurface_Patch( int maxPatchWidth, int maxPatchHeight );
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idSurface_Patch( const idSurface_Patch &patch );
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~idSurface_Patch( void );
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void SetSize( int patchWidth, int patchHeight );
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int GetWidth( void ) const;
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int GetHeight( void ) const;
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// subdivide the patch mesh based on error
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void Subdivide( float maxHorizontalError, float maxVerticalError, float maxLength, bool genNormals = false );
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// subdivide the patch up to an explicit number of horizontal and vertical subdivisions
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void SubdivideExplicit( int horzSubdivisions, int vertSubdivisions, bool genNormals, bool removeLinear = false );
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protected:
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int width; // width of patch
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int height; // height of patch
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int maxWidth; // maximum width allocated for
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int maxHeight; // maximum height allocated for
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bool expanded; // true if vertices are spaced out
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private:
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// put the approximation points on the curve
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void PutOnCurve( void );
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// remove columns and rows with all points on one line
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void RemoveLinearColumnsRows( void );
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// resize verts buffer
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void ResizeExpanded( int height, int width );
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// space points out over maxWidth * maxHeight buffer
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void Expand( void );
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// move all points to the start of the verts buffer
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void Collapse( void );
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// project a point onto a vector to calculate maximum curve error
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void ProjectPointOntoVector( const idVec3 &point, const idVec3 &vStart, const idVec3 &vEnd, idVec3 &vProj );
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// generate normals
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void GenerateNormals( void );
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// generate triangle indexes
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void GenerateIndexes( void );
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// lerp point from two patch point
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void LerpVert( const idDrawVert &a, const idDrawVert &b, idDrawVert &out ) const;
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// sample a single 3x3 patch
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void SampleSinglePatchPoint( const idDrawVert ctrl[3][3], float u, float v, idDrawVert *out ) const;
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void SampleSinglePatch( const idDrawVert ctrl[3][3], int baseCol, int baseRow, int width, int horzSub, int vertSub, idDrawVert *outVerts ) const;
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};
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/*
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=================
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idSurface_Patch::idSurface_Patch
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=================
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*/
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ID_INLINE idSurface_Patch::idSurface_Patch( void ) {
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height = width = maxHeight = maxWidth = 0;
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expanded = false;
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}
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/*
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=================
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idSurface_Patch::idSurface_Patch
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=================
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*/
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ID_INLINE idSurface_Patch::idSurface_Patch( int maxPatchWidth, int maxPatchHeight ) {
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width = height = 0;
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maxWidth = maxPatchWidth;
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maxHeight = maxPatchHeight;
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verts.SetNum( maxWidth * maxHeight );
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expanded = false;
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}
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/*
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=================
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idSurface_Patch::idSurface_Patch
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=================
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*/
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ID_INLINE idSurface_Patch::idSurface_Patch( const idSurface_Patch &patch ) {
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(*this) = patch;
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}
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/*
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=================
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idSurface_Patch::~idSurface_Patch
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=================
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*/
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ID_INLINE idSurface_Patch::~idSurface_Patch() {
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}
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/*
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=================
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idSurface_Patch::GetWidth
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=================
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*/
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ID_INLINE int idSurface_Patch::GetWidth( void ) const {
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return width;
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}
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/*
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=================
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idSurface_Patch::GetHeight
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=================
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*/
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ID_INLINE int idSurface_Patch::GetHeight( void ) const {
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return height;
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}
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#endif /* !__SURFACE_PATCH_H__ */
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