Refactor folder (#10475)

Move many third-party components' source codes from the src folder to a new folder called deps_src. The goal is to make the code structure clearer and easier to navigate.

deps_src/libigl/igl/opengl/bind_vertex_attrib_array.cpp

@@ -0,0 +1,24 @@
+#include "bind_vertex_attrib_array.h"
+
+IGL_INLINE GLint igl::opengl::bind_vertex_attrib_array(
+  const GLuint program_shader,
+  const std::string &name, 
+  GLuint bufferID, 
+  const Eigen::Matrix<float,Eigen::Dynamic,Eigen::Dynamic,Eigen::RowMajor> &M, 
+  bool refresh)
+{
+  GLint id = glGetAttribLocation(program_shader, name.c_str());
+  if (id < 0)
+    return id;
+  if (M.size() == 0)
+  {
+    glDisableVertexAttribArray(id);
+    return id;
+  }
+  glBindBuffer(GL_ARRAY_BUFFER, bufferID);
+  if (refresh)
+    glBufferData(GL_ARRAY_BUFFER, sizeof(float)*M.size(), M.data(), GL_DYNAMIC_DRAW);
+  glVertexAttribPointer(id, M.cols(), GL_FLOAT, GL_FALSE, 0, 0);
+  glEnableVertexAttribArray(id);
+  return id;
+}