/usr/share/pyshared/OpenGL/GLU/glunurbs.py is in python-opengl 3.0.1~b2-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 | """Implementation of GLU Nurbs structure and callback methods
Same basic pattern as seen with the gluTess* functions, just need to
add some bookkeeping to the structure class so that we can keep the
Python function references alive during the calling process.
"""
from OpenGL.raw import GLU as simple
from OpenGL import platform, converters, wrapper
from OpenGL.GLU import glustruct
from OpenGL.lazywrapper import lazy
from OpenGL import arrays, error
import ctypes
import weakref
from OpenGL.platform import PLATFORM
import OpenGL
__all__ = (
'GLUnurbs',
'gluNewNurbsRenderer',
'gluNurbsCallback',
'gluNurbsCallbackData',
'gluNurbsCallbackDataEXT',
'gluNurbsCurve',
'gluNurbsSurface',
'gluPwlCurve',
)
# /usr/include/GL/glu.h 242
class GLUnurbs(glustruct.GLUStruct, simple.GLUnurbs):
"""GLU Nurbs structure with oor and callback storage support
IMPORTANT NOTE: the texture coordinate callback receives a raw ctypes
data-pointer, as without knowing what type of evaluation is being done
(1D or 2D) we cannot safely determine the size of the array to convert
it. This is a limitation of the C implementation. To convert to regular
data-pointer, just call yourNurb.ptrAsArray( ptr, size, arrays.GLfloatArray )
with the size of data you expect.
"""
FUNCTION_TYPE = PLATFORM.functionTypeFor(PLATFORM.GLU)
CALLBACK_FUNCTION_REGISTRARS = {
# mapping from "which" to a function that should take 3 parameters,
# the nurb, the which and the function pointer...
}
CALLBACK_TYPES = {
# mapping from "which" GLU enumeration to a ctypes function type
simple.GLU_NURBS_BEGIN: FUNCTION_TYPE(
None, simple.GLenum
),
simple.GLU_NURBS_BEGIN_DATA: FUNCTION_TYPE(
None, simple.GLenum, ctypes.POINTER(simple.GLvoid)
),
simple.GLU_NURBS_VERTEX: FUNCTION_TYPE(
None, ctypes.POINTER(simple.GLfloat)
),
simple.GLU_NURBS_VERTEX_DATA: FUNCTION_TYPE(
None, ctypes.POINTER(simple.GLfloat), ctypes.POINTER(simple.GLvoid)
),
simple.GLU_NURBS_NORMAL: FUNCTION_TYPE(
None, ctypes.POINTER(simple.GLfloat)
),
simple.GLU_NURBS_NORMAL_DATA: FUNCTION_TYPE(
None, ctypes.POINTER(simple.GLfloat), ctypes.POINTER(simple.GLvoid)
),
simple.GLU_NURBS_COLOR: FUNCTION_TYPE(
None, ctypes.POINTER(simple.GLfloat)
),
simple.GLU_NURBS_COLOR_DATA: FUNCTION_TYPE(
None, ctypes.POINTER(simple.GLfloat), ctypes.POINTER(simple.GLvoid)
),
simple.GLU_NURBS_TEXTURE_COORD: FUNCTION_TYPE(
None, ctypes.POINTER(simple.GLfloat)
),
simple.GLU_NURBS_TEXTURE_COORD_DATA: FUNCTION_TYPE(
None, ctypes.POINTER(simple.GLfloat), ctypes.POINTER(simple.GLvoid)
),
simple.GLU_NURBS_END:FUNCTION_TYPE(
None
),
simple.GLU_NURBS_END_DATA: FUNCTION_TYPE(
None, ctypes.POINTER(simple.GLvoid)
),
simple.GLU_NURBS_ERROR:FUNCTION_TYPE(
None, simple.GLenum,
),
}
WRAPPER_METHODS = {
simple.GLU_NURBS_BEGIN: None,
simple.GLU_NURBS_BEGIN_DATA: '_justOOR',
simple.GLU_NURBS_VERTEX: '_vec3',
simple.GLU_NURBS_VERTEX_DATA: '_vec3',
simple.GLU_NURBS_NORMAL: '_vec3',
simple.GLU_NURBS_NORMAL_DATA: '_vec3',
simple.GLU_NURBS_COLOR: '_vec4',
simple.GLU_NURBS_COLOR_DATA: '_vec4',
simple.GLU_NURBS_TEXTURE_COORD: '_tex',
simple.GLU_NURBS_TEXTURE_COORD_DATA: '_tex',
simple.GLU_NURBS_END: None,
simple.GLU_NURBS_END_DATA: '_justOOR',
simple.GLU_NURBS_ERROR: None,
}
def _justOOR( self, function ):
"""Just do OOR on the last argument..."""
def getOOR( *args ):
args = args[:-1] + (self.originalObject(args[-1]),)
return function( *args )
return getOOR
def _vec3( self, function, size=3 ):
"""Convert first arg to size-element array, do OOR on arg2 if present"""
def vec( *args ):
vec = self.ptrAsArray(args[0],size,arrays.GLfloatArray)
if len(args) > 1:
oor = self.originalObject(args[1])
return function( vec, oor )
else:
return function( vec )
return vec
def _vec4( self, function ):
"""Size-4 vector version..."""
return self._vec3( function, 4 )
def _tex( self, function ):
"""Texture coordinate callback
NOTE: there is no way for *us* to tell what size the array is, you will
get back a raw data-point, not an array, as you do for all other callback
types!!!
"""
def oor( *args ):
if len(args) > 1:
oor = self.originalObject(args[1])
return function( args[0], oor )
else:
return function( args[0] )
return oor
# XXX yes, this is a side-effect...
simple.gluNewNurbsRenderer.restype = ctypes.POINTER( GLUnurbs )
def _callbackWithType( funcType ):
"""Get gluNurbsCallback function with set last arg-type"""
result = platform.copyBaseFunction(
simple.gluNurbsCallback
)
result.argtypes = [ctypes.POINTER(GLUnurbs), simple.GLenum, funcType]
assert result.argtypes[-1] == funcType
return result
for (c,funcType) in GLUnurbs.CALLBACK_TYPES.items():
cb = _callbackWithType( funcType )
GLUnurbs.CALLBACK_FUNCTION_REGISTRARS[ c ] = cb
assert funcType == GLUnurbs.CALLBACK_TYPES[c]
assert cb.argtypes[-1] == funcType
del c,cb, funcType
def gluNurbsCallback( nurb, which, CallBackFunc ):
"""Dispatch to the nurb's addCallback operation"""
return nurb.addCallback( which, CallBackFunc )
@lazy( simple.gluNewNurbsRenderer )
def gluNewNurbsRenderer( baseFunction ):
"""Return a new nurbs renderer for the system (dereferences pointer)"""
newSet = baseFunction()
new = newSet[0]
#new.__class__ = GLUnurbs # yes, I know, ick
return new
@lazy( simple.gluNurbsCallbackData )
def gluNurbsCallbackData( baseFunction, nurb, userData ):
"""Note the Python object for use as userData by the nurb"""
return baseFunction(
nurb, nurb.noteObject( userData )
)
MAX_ORDER = 8
def checkOrder( order,knotCount,name ):
"""Check that order is valid..."""
if order < 1:
raise error.GLUError(
"""%s should be 1 or more, is %s"""%( name,order,)
)
elif order > MAX_ORDER:
raise error.GLUError(
"""%s should be %s or less, is %s"""%( name, MAX_ORDER, order)
)
elif knotCount < (2*order):
raise error.GLUError(
"""Knotcount must be at least 2x %s is %s should be at least %s"""%( name, knotCount, 2*order)
)
def checkKnots( knots, name ):
"""Check that knots are in ascending order"""
if len(knots):
knot = knots[0]
for next in knots[1:]:
if next < knot:
raise error.GLUError(
"""%s has decreasing knot %s after %s"""%( name, next, knot )
)
@lazy( simple.gluNurbsCallbackDataEXT )
def gluNurbsCallbackDataEXT( baseFunction,nurb, userData ):
"""Note the Python object for use as userData by the nurb"""
return baseFunction(
nurb, nurb.noteObject( userData )
)
@lazy( simple.gluNurbsCurve )
def gluNurbsCurve( baseFunction, nurb, knots, control, type ):
"""Pythonic version of gluNurbsCurve
Calculates knotCount, stride, and order automatically
"""
knots = arrays.GLfloatArray.asArray( knots )
knotCount = arrays.GLfloatArray.arraySize( knots )
control = arrays.GLfloatArray.asArray( control )
try:
length,step = arrays.GLfloatArray.dimensions( control )
except ValueError, err:
raise error.GLUError( """Need a 2-dimensional control array""" )
order = knotCount - length
if OpenGL.ERROR_CHECKING:
checkOrder( order, knotCount, 'order of NURBS curve')
checkKnots( knots, 'knots of NURBS curve')
return baseFunction(
nurb, knotCount, knots, step, control, order, type,
)
@lazy( simple.gluNurbsSurface )
def gluNurbsSurface( baseFunction, nurb, sKnots, tKnots, control, type ):
"""Pythonic version of gluNurbsSurface
Calculates knotCount, stride, and order automatically
"""
sKnots = arrays.GLfloatArray.asArray( sKnots )
sKnotCount = arrays.GLfloatArray.arraySize( sKnots )
tKnots = arrays.GLfloatArray.asArray( tKnots )
tKnotCount = arrays.GLfloatArray.arraySize( tKnots )
control = arrays.GLfloatArray.asArray( control )
try:
length,width,step = arrays.GLfloatArray.dimensions( control )
except ValueError, err:
raise error.GLUError( """Need a 3-dimensional control array""" )
sOrder = sKnotCount - length
tOrder = tKnotCount - width
sStride = width*step
tStride = step
if OpenGL.ERROR_CHECKING:
checkOrder( sOrder, sKnotCount, 'sOrder of NURBS surface')
checkOrder( tOrder, tKnotCount, 'tOrder of NURBS surface')
checkKnots( sKnots, 'sKnots of NURBS surface')
checkKnots( tKnots, 'tKnots of NURBS surface')
if not (sKnotCount-sOrder)*(tKnotCount-tOrder) == length*width:
raise error.GLUError(
"""Invalid NURB structure""",
nurb, sKnotCount, sKnots, tKnotCount, tKnots,
sStride, tStride, control,
sOrder,tOrder,
type
)
result = baseFunction(
nurb, sKnotCount, sKnots, tKnotCount, tKnots,
sStride, tStride, control,
sOrder,tOrder,
type
)
return result
@lazy( simple.gluPwlCurve )
def gluPwlCurve( baseFunction, nurb, data, type ):
"""gluPwlCurve -- piece-wise linear curve within GLU context
data -- the data-array
type -- determines number of elements/data-point
"""
data = arrays.GLfloatArray.asArray( data )
if type == simple.GLU_MAP1_TRIM_2:
divisor = 2
elif type == simple.GLU_MAP_TRIM_3:
divisor = 3
else:
raise ValueError( """Unrecognised type constant: %s"""%(type))
size = arrays.GLfloatArray.arraySize( data )
size = int(size//divisor)
return baseFunction( nurb, size, data, divisor, type )
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