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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) 2014, Nicolas P. Rougier
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
import numpy as np
from ... import glsl
from . collection import Collection
from ..transforms import NullTransform
from ...geometry import triangulate
class RawPolygonCollection(Collection):
def __init__(self, user_dtype=None, transform=None,
vertex=None, fragment=None, **kwargs):
base_dtype = [('position', (np.float32, 3), '!local', (0, 0, 0)),
('color', (np.float32, 4), 'local', (0, 0, 0, 1))]
dtype = base_dtype
if user_dtype:
dtype.extend(user_dtype)
if vertex is None:
vertex = glsl.get('collections/raw-triangle.vert')
if transform is None:
transform = NullTransform()
self.transform = transform
if fragment is None:
fragment = glsl.get('collections/raw-triangle.frag')
Collection.__init__(self, dtype=dtype, itype=np.uint32, # 16 for WebGL
mode="triangles",
vertex=vertex, fragment=fragment, **kwargs)
# Set hooks if necessary
program = self._programs[0]
program.vert['transform'] = self.transform
def append(self, points, **kwargs):
"""
Append a new set of vertices to the collection.
For kwargs argument, n is the number of vertices (local) or the number
of item (shared)
Parameters
----------
points : np.array
Vertices composing the triangles
color : list, array or 4-tuple
Path color
"""
vertices, indices = triangulate(points)
itemsize = len(vertices)
itemcount = 1
V = np.empty(itemcount * itemsize, dtype=self.vtype)
for name in self.vtype.names:
if name not in ['collection_index', 'position']:
V[name] = kwargs.get(name, self._defaults[name])
V["position"] = vertices
# Uniforms
if self.utype:
U = np.zeros(itemcount, dtype=self.utype)
for name in self.utype.names:
if name not in ["__unused__"]:
U[name] = kwargs.get(name, self._defaults[name])
else:
U = None
Collection.append(self, vertices=V, uniforms=U,
indices=np.array(indices).ravel(),
itemsize=itemsize)
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