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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) | |