Method: Snow::Mat4Array#store

Defined in:

ext/snow-math/snow-math.c

#store(sm_index, sm_value) ⇒ Object Also known as: []=

Stores a Mat4 at the given index. If the provided Mat4 is a member of the array and stored at the index, then no copy is done, otherwise the Mat4 is copied to the array.

If the value stored is a Mat3, it will be converted to a Mat4 for storage, though this will not modify the value directly.

call-seq: store(index, value) -> value

# File 'ext/snow-math/snow-math.c', line 1481

static VALUE sm_mat4_array_store(VALUE sm_self, VALUE sm_index, VALUE sm_value)
{
  mat4_t *arr;
  size_t length = NUM2SIZET(sm_mathtype_array_length(sm_self));
  size_t index = NUM2SIZET(sm_index);
  int is_mat4 = 0;

  rb_check_frozen(sm_self);

  if (index >= length) {
    rb_raise(rb_eRangeError,
      "Index %zu out of bounds for array with length %zu",
      index, length);
  } else if (!(is_mat4 = SM_IS_A(sm_value, mat4)) && !SM_IS_A(sm_value, mat3)) {
    rb_raise(rb_eTypeError,
      "Invalid value to store: expected Mat3 or Mat4, got %s",
      rb_obj_classname(sm_value));
  }

  Data_Get_Struct(sm_self, mat4_t, arr);

  if (is_mat4) {
    mat4_t *value = sm_unwrap_mat4(sm_value, NULL);
    if (value == &arr[index]) {
      /* The object's part of the array, don't bother copying */
      return sm_value;
    }
    mat4_copy(*value, arr[index]);
  } else {
    mat3_to_mat4(*sm_unwrap_mat3(sm_value, NULL), arr[index]);
  }
  return sm_value;
}