void motion_reset(int16_t position)
// Reset the motion buffer to the specified position. The enabled state is preserved.
{
// Reset the counter.
motion_counter = 0;
// Reset the duration.
motion_duration = 0;
// Reset the queue.
motion_head = 0;
motion_tail = 0;
// Reset the keypoint.
keys[0].delta = 0;
keys[0].position = int_to_float(position);
keys[0].in_velocity = 0.0;
keys[0].out_velocity = 0.0;
// Initialize an empty hermite curve. This is a degenerate case for the hermite
// curve that will always return the position of the curve without velocity.
curve_init(0, 0, keys[0].position, keys[0].position, 0.0, 0.0);
// Reset the registers.
motion_registers_reset();
}
float __floatsisf(int i)
{
float_t res;
res.data = int_to_float(i);
return res.val;
}
int text_entry::get_cursor_caret_pos(const point& cursor_pos) const {
int cursor_caret_pos = _visible_pos;
int text_area_left = get_text_area().get_left();
if (cursor_pos._x >= text_area_left) {
auto& font = get_font();
float font_size = get_font_size();
std::wstring visible_text = _text;
raw_text_to_visible_text(visible_text);
int text_length = uint_to_int(visible_text.length());
while (cursor_caret_pos < text_length) {
float width_a = font.get_text_width(font_size, visible_text.c_str(), _visible_pos, cursor_caret_pos - _visible_pos);
float width_b = font.get_text_width(font_size, visible_text.c_str(), _visible_pos, cursor_caret_pos - _visible_pos + 1);
float width_extra = (width_b - width_a) / 2.f;
if (cursor_pos._x < (int_to_float(text_area_left) + width_a + width_extra)) {
break;
}
cursor_caret_pos++;
}
}
return cursor_caret_pos;
}
uint8_t motion_append(void)
// Append a new curve keypoint from data stored in the curve registers. The keypoint
// is offset from the previous curve by the specified delta. An error is returned if
// there is no more room to store the new keypoint in the buffer or if the delta is
// less than one (a zero delta is not allowed).
{
int16_t position;
int16_t in_velocity;
int16_t out_velocity;
uint8_t next;
uint16_t delta;
// Get the next index in the buffer.
next = (motion_head + 1) & MOTION_BUFFER_MASK;
// Return error if we have looped the head to the tail and the buffer is filled.
if (next == motion_tail) return 0;
// Get the position, velocity and time delta values from the registers.
position = (int16_t) registers_read_word(REG_CURVE_POSITION_HI, REG_CURVE_POSITION_LO);
in_velocity = (int16_t) registers_read_word(REG_CURVE_IN_VELOCITY_HI, REG_CURVE_IN_VELOCITY_LO);
out_velocity = (int16_t) registers_read_word(REG_CURVE_OUT_VELOCITY_HI, REG_CURVE_OUT_VELOCITY_LO);
delta = (uint16_t) registers_read_word(REG_CURVE_DELTA_HI, REG_CURVE_DELTA_LO);
// Keypoint delta must be greater than zero.
if (delta < 1) return 0;
// Fill in the next keypoint.
keys[next].delta = delta;
keys[next].position = int_to_float(position);
keys[next].in_velocity = fixed_to_float(in_velocity);
keys[next].out_velocity = fixed_to_float(out_velocity);
// Is this keypoint being added to an empty buffer?
if (motion_tail == motion_head)
{
// Initialize a new hermite curve that gets us from the current position to the new position.
// We use a velocity of zero at each end to smoothly transition from one to the other.
curve_init(0, delta, curve_get_p1(), keys[next].position, 0.0, 0.0);
}
// Increase the duration of the buffer.
motion_duration += delta;
// Set the new head index.
motion_head = next;
// Reset the motion registers and update the buffer status.
motion_registers_reset();
return 1;
}
bool viewport::try_unproject(vec3& world_position, const mat44& view_projection_transform, const point& screen_position) const {
if (_width == 0 || _height == 0) {
return false;
}
vec4 in;
in._x = ((int_to_float(screen_position._x - uint_to_int(_x)) / uint_to_float(_width)) * 2.f) - 1.f;
in._y = ((int_to_float(screen_position._y - uint_to_int(_y)) / uint_to_float(_height)) * 2.f) - 1.f;
in._y *= -1.f;
in._z = 0.f; //0 = near plane, 1 = far plane
in._w = 1.f;
vec4 out = in * make_mat44_inverted(view_projection_transform);
if (is_approx(out._w, 0.f, 0.0001f)) {
return false;
}
world_position._x = out._x / out._w;
world_position._y = out._y / out._w;
world_position._z = out._z / out._w;
return true;
}
float calculate_best_area_scale(const size& desired_size, const size& current_size) {
if (
desired_size._width <= 0 || desired_size._height <= 0 ||
current_size._width <= 0 || current_size._height <= 0) {
return 1.f;
}
float desired_aspect_ratio = int_to_float(desired_size._width) / int_to_float(desired_size._height);
float current_aspect_ratio = int_to_float(current_size._width) / int_to_float(current_size._height);
if (current_aspect_ratio >= desired_aspect_ratio) {
return int_to_float(current_size._height) / int_to_float(desired_size._height);
}
else {
return int_to_float(current_size._width) / int_to_float(desired_size._width);
}
}