Class GLUtessellatorCallbackAdapter
- All Implemented Interfaces:
GLUtessellatorCallback
GLUtessellatorCallback
with empty callback methods. This class can be extended to provide user
defined callback methods.- Author:
- Eric Veach, July 1994, Java Port: Pepijn Van Eechhoudt, July 2003, Java Port: Nathan Parker Burg, August 2003
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
begin
(int type) The begin callback method is invoked likeinvalid reference
glBegin
void
The same as thebegin
callback method except that it takes an additional reference argument.void
The combine callback method is called to create a new vertex when the tessellation detects an intersection, or wishes to merge features.void
combineData
(double[] coords, Object[] data, float[] weight, Object[] outData, Object polygonData) The same as thecombine
callback method except that it takes an additional reference argument.void
edgeFlag
(boolean boundaryEdge) The edgeFlag callback method is similar toinvalid reference
glEdgeFlag
void
edgeFlagData
(boolean boundaryEdge, Object polygonData) The same as theedgeFlage
callback method except that it takes an additional reference argument.void
end()
The end callback serves the same purpose asinvalid reference
glEnd
void
The same as theend
callback method except that it takes an additional reference argument.void
error
(int errnum) The error callback method is called when an error is encountered.void
The same as theerror
callback method except that it takes an additional reference argument.void
void
vertexData
(Object vertexData, Object polygonData) The same as thevertex
callback method except that it takes an additional reference argument.
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Constructor Details
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GLUtessellatorCallbackAdapter
public GLUtessellatorCallbackAdapter()
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Method Details
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begin
public void begin(int type) Description copied from interface:GLUtessellatorCallback
The begin callback method is invoked likeinvalid reference
glBegin
- Specified by:
begin
in interfaceGLUtessellatorCallback
- Parameters:
type
- Specifics the type of begin/end pair being defined. The following values are valid: GL_TRIANGLE_FAN, GL_TRIANGLE_STRIP, GL_TRIANGLES or GL_LINE_LOOP.- See Also:
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edgeFlag
public void edgeFlag(boolean boundaryEdge) Description copied from interface:GLUtessellatorCallback
The edgeFlag callback method is similar toinvalid reference
glEdgeFlag
Since triangle fans and triangle strips do not support edge flags, the begin callback is not called with GL_TRIANGLE_FAN or GL_TRIANGLE_STRIP if a non-null edge flag callback is provided. (If the callback is initialized to null, there is no impact on performance). Instead, the fans and strips are converted to independent triangles.
- Specified by:
edgeFlag
in interfaceGLUtessellatorCallback
- Parameters:
boundaryEdge
- Specifics which edges lie on the polygon boundary.- See Also:
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vertex
Description copied from interface:GLUtessellatorCallback
The vertex callback method is invoked between thebegin
andend
callback methods. It is similar toinvalid reference
glVertex3f
invalid reference
gluTessVertex
- Specified by:
vertex
in interfaceGLUtessellatorCallback
- Parameters:
vertexData
- Specifics a reference to the vertices of the triangles created byt the tessellatin process.- See Also:
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end
public void end()Description copied from interface:GLUtessellatorCallback
The end callback serves the same purpose asinvalid reference
glEnd
- Specified by:
end
in interfaceGLUtessellatorCallback
- See Also:
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error
public void error(int errnum) Description copied from interface:GLUtessellatorCallback
The error callback method is called when an error is encountered. The one argument is of type int; it indicates the specific error that occurred and will be set to one of GLU_TESS_MISSING_BEGIN_POLYGON, GLU_TESS_MISSING_END_POLYGON, GLU_TESS_MISSING_BEGIN_CONTOUR, GLU_TESS_MISSING_END_CONTOUR, GLU_TESS_COORD_TOO_LARGE, GLU_TESS_NEED_COMBINE_CALLBACK or GLU_OUT_OF_MEMORY. Character strings describing these errors can be retrieved with thegluErrorString
call.The GLU library will recover from the first four errors by inserting the missing call(s). GLU_TESS_COORD_TOO_LARGE indicates that some vertex coordinate exceeded the predefined constant GLU_TESS_MAX_COORD in absolute value, and that the value has been clamped. (Coordinate values must be small enough so that two can be multiplied together without overflow.) GLU_TESS_NEED_COMBINE_CALLBACK indicates that the tessellation detected an intersection between two edges in the input data, and the GLU_TESS_COMBINE or GLU_TESS_COMBINE_DATA callback was not provided. No output is generated. GLU_OUT_OF_MEMORY indicates that there is not enough memory so no output is generated.
- Specified by:
error
in interfaceGLUtessellatorCallback
- Parameters:
errnum
- Specifics the error number code.- See Also:
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combine
Description copied from interface:GLUtessellatorCallback
The combine callback method is called to create a new vertex when the tessellation detects an intersection, or wishes to merge features. The method takes four arguments: an array of three elements each of type double, an array of four references, an array of four elements each of type float, and a reference to a reference.The vertex is defined as a linear combination of up to four existing vertices, stored in data. The coefficients of the linear combination are given by weight; these weights always add up to 1. All vertex pointers are valid even when some of the weights are 0. coords gives the location of the new vertex.
The user must allocate another vertex, interpolate parameters using data and weight, and return the new vertex pointer in outData. This handle is supplied during rendering callbacks. The user is responsible for freeing the memory some time after
invalid reference
gluTessEndPolygon
For example, if the polygon lies in an arbitrary plane in 3-space, and a color is associated with each vertex, the GLU_TESS_COMBINE callback might look like this:
void myCombine(double[] coords, Object[] data, float[] weight, Object[] outData) { MyVertex newVertex = new MyVertex(); newVertex.x = coords[0]; newVertex.y = coords[1]; newVertex.z = coords[2]; newVertex.r = weight[0]*data[0].r + weight[1]*data[1].r + weight[2]*data[2].r + weight[3]*data[3].r; newVertex.g = weight[0]*data[0].g + weight[1]*data[1].g + weight[2]*data[2].g + weight[3]*data[3].g; newVertex.b = weight[0]*data[0].b + weight[1]*data[1].b + weight[2]*data[2].b + weight[3]*data[3].b; newVertex.a = weight[0]*data[0].a + weight[1]*data[1].a + weight[2]*data[2].a + weight[3]*data[3].a; outData = newVertex; }
- Specified by:
combine
in interfaceGLUtessellatorCallback
- Parameters:
coords
- Specifics the location of the new vertex.data
- Specifics the vertices used to create the new vertex.weight
- Specifics the weights used to create the new vertex.outData
- Reference user the put the coodinates of the new vertex.- See Also:
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beginData
Description copied from interface:GLUtessellatorCallback
The same as thebegin
callback method except that it takes an additional reference argument. This reference is identical to the opaque reference provided wheninvalid reference
gluTessBeginPolygon
- Specified by:
beginData
in interfaceGLUtessellatorCallback
- Parameters:
type
- Specifics the type of begin/end pair being defined. The following values are valid: GL_TRIANGLE_FAN, GL_TRIANGLE_STRIP, GL_TRIANGLES or GL_LINE_LOOP.polygonData
- Specifics a reference to user-defined data.- See Also:
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edgeFlagData
Description copied from interface:GLUtessellatorCallback
The same as theedgeFlage
callback method except that it takes an additional reference argument. This reference is identical to the opaque reference provided wheninvalid reference
gluTessBeginPolygon
- Specified by:
edgeFlagData
in interfaceGLUtessellatorCallback
- Parameters:
boundaryEdge
- Specifics which edges lie on the polygon boundary.polygonData
- Specifics a reference to user-defined data.- See Also:
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vertexData
Description copied from interface:GLUtessellatorCallback
The same as thevertex
callback method except that it takes an additional reference argument. This reference is identical to the opaque reference provided wheninvalid reference
gluTessBeginPolygon
- Specified by:
vertexData
in interfaceGLUtessellatorCallback
- Parameters:
vertexData
- Specifics a reference to the vertices of the triangles created byt the tessellatin process.polygonData
- Specifics a reference to user-defined data.- See Also:
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endData
Description copied from interface:GLUtessellatorCallback
The same as theend
callback method except that it takes an additional reference argument. This reference is identical to the opaque reference provided wheninvalid reference
gluTessBeginPolygon
- Specified by:
endData
in interfaceGLUtessellatorCallback
- Parameters:
polygonData
- Specifics a reference to user-defined data.- See Also:
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errorData
Description copied from interface:GLUtessellatorCallback
The same as theerror
callback method except that it takes an additional reference argument. This reference is identical to the opaque reference provided wheninvalid reference
gluTessBeginPolygon
- Specified by:
errorData
in interfaceGLUtessellatorCallback
- Parameters:
errnum
- Specifics the error number code.polygonData
- Specifics a reference to user-defined data.- See Also:
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combineData
public void combineData(double[] coords, Object[] data, float[] weight, Object[] outData, Object polygonData) Description copied from interface:GLUtessellatorCallback
The same as thecombine
callback method except that it takes an additional reference argument. This reference is identical to the opaque reference provided wheninvalid reference
gluTessBeginPolygon
- Specified by:
combineData
in interfaceGLUtessellatorCallback
- Parameters:
coords
- Specifics the location of the new vertex.data
- Specifics the vertices used to create the new vertex.weight
- Specifics the weights used to create the new vertex.outData
- Reference user the put the coodinates of the new vertex.polygonData
- Specifics a reference to user-defined data.- See Also:
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