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
|
.. py:currentmodule:: moderngl
Vertex Array
============
:py:class:`VertexArray` is something like a pipeline, where as arguments :py:meth:`Context.vertex_array` takes a :py:class:`Program`, a :py:class:`Buffer` with input data, and the names of input variables for this program.
:py:class:`VertexArray` in ModernGL can be initialized in two ways: one buffer for all input variables or multiple buffers for all input variables.
One input buffer for all input variables (simple :py:class:`VertexArray` version)::
vao = ctx.vertex_array(program, buffer, 'input_var1', 'input_var2')
Multiple input buffers for all input variables::
vao = ctx.vertex_array(
program,
[
(buffer1, '3f 2f', 'input_var1', 'input_var2'),
(buffer2, '4f', 'input_var3')
]
)
You can understand ``'3f 2f'`` and ``'4f'`` as the type of the input variable (or variables), that is, 3 floats and 2 floats, which form, for example, ``vec3 + vec2`` and 4 floats, which form ``vec4``.
In our example we use a simple implementation of this method.
.. rubric:: Entire source
.. literalinclude:: first.3.py
:emphasize-lines: 42
:linenos:
Proceed to the :doc:`next step <rendering>`.
|
