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# ***** BEGIN GPL LICENSE BLOCK *****
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ***** END GPL LICENSE BLOCK *****
__all__ = (
"batch_for_shader",
)
def batch_for_shader(shader, type, content, *, indices=None):
"""
Return a batch already configured and compatible with the shader.
:arg shader: shader for which a compatible format will be computed.
:type shader: :class:`gpu.types.GPUShader`
:arg type: "'POINTS', 'LINES', 'TRIS' or 'LINES_ADJ'".
:type type: str
:arg content: Maps the name of the shader attribute with the data to fill the vertex buffer.
:type content: dict
:return: compatible batch
:rtype: :class:`gpu.types.Batch`
"""
from gpu.types import (
GPUBatch,
GPUIndexBuf,
GPUVertBuf,
)
for data in content.values():
vbo_len = len(data)
break
else:
raise ValueError("Empty 'content'")
vbo_format = shader.format_calc()
vbo = GPUVertBuf(vbo_format, vbo_len)
for id, data in content.items():
if len(data) != vbo_len:
raise ValueError("Length mismatch for 'content' values")
vbo.attr_fill(id, data)
if indices is None:
return GPUBatch(type=type, buf=vbo)
else:
ibo = GPUIndexBuf(type=type, seq=indices)
return GPUBatch(type=type, buf=vbo, elem=ibo)
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