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Building
Building
File size: 2,373 Bytes
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# Copyright (c) Meta Platforms, Inc. and affiliates.
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
from animated_drawings.model.transform import Transform
import numpy as np
import numpy.typing as npt
import OpenGL.GL as GL
import ctypes
class TransformWidget(Transform):
def __init__(self, shader_name: str = 'color_shader'):
super().__init__()
self.points: npt.NDArray[np.float32] = np.array([
[0.0, 0.0, 0.0, 1.0, 0.0, 0.0],
[1.0, 0.0, 0.0, 1.0, 0.0, 0.0],
[0.0, 0.0, 0.0, 0.0, 1.0, 0.0],
[0.0, 1.0, 0.0, 0.0, 1.0, 0.0],
[0.0, 0.0, 0.0, 0.0, 0.0, 1.0],
[0.0, 0.0, 1.0, 0.0, 0.0, 1.0],
], np.float32)
self.shader_name: str = shader_name
self._is_opengl_initialized: bool = False
def _initialize_opengl_resources(self):
self.vao = GL.glGenVertexArrays(1)
self.vbo = GL.glGenBuffers(1)
GL.glBindVertexArray(self.vao)
# buffer vertex data
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self.vbo)
GL.glBufferData(GL.GL_ARRAY_BUFFER, self.points, GL.GL_STATIC_DRAW)
vert_bytes = 4 * self.points.shape[1] # 4 is byte size of np.float32
pos_offset = 4 * 0
color_offset = 4 * 3
# position attributes
GL.glVertexAttribPointer(
0, 3, GL.GL_FLOAT, False, vert_bytes, ctypes.c_void_p(pos_offset))
GL.glEnableVertexAttribArray(0)
# color attributes
GL.glVertexAttribPointer(
1, 3, GL.GL_FLOAT, False, vert_bytes, ctypes.c_void_p(color_offset))
GL.glEnableVertexAttribArray(1)
GL.glBindBuffer(GL.GL_ARRAY_BUFFER, 0)
GL.glBindVertexArray(0)
self._is_opengl_initialized = True
def _draw(self, **kwargs):
if not self._is_opengl_initialized:
self._initialize_opengl_resources()
GL.glUseProgram(kwargs['shader_ids'][self.shader_name])
model_loc = GL.glGetUniformLocation(
kwargs['shader_ids'][self.shader_name], "model")
GL.glUniformMatrix4fv(model_loc, 1, GL.GL_FALSE,
self._world_transform.T)
GL.glBindVertexArray(self.vao)
GL.glDrawArrays(GL.GL_LINES, 0, len(self.points))
GL.glBindVertexArray(0)
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