void HrtfData::sample_direction(angle_t elevation, angle_t azimuth, distance_t distance, uint32_t sample, float& value_left, float& delay_left, float& value_right, float& delay_right) const
{
_ASSERT(elevation >= -angle_t(pi * 0.5));
_ASSERT(elevation <= angle_t(pi * 0.5));
_ASSERT(azimuth >= -angle_t(2.0 * pi));
_ASSERT(azimuth <= angle_t(2.0 * pi));
sample_direction(elevation, azimuth, distance, sample, value_left, delay_left);
sample_direction(elevation, -azimuth, distance, sample, value_right, delay_right);
}
void HrtfData::get_direction_data(angle_t elevation, angle_t azimuth, distance_t distance, DirectionData& ref_data_left, DirectionData& ref_data_right) const
{
_ASSERT(elevation >= -angle_t(pi * 0.5));
_ASSERT(elevation <= angle_t(pi * 0.5));
_ASSERT(azimuth >= -angle_t(2.0 * pi));
_ASSERT(azimuth <= angle_t(2.0 * pi));
get_direction_data(elevation, azimuth, distance, ref_data_left);
get_direction_data(elevation, -azimuth, distance, ref_data_right);
}
void RenderViewport::InitTextureMapping()
{
int i;
// Calc focallength so FieldOfView angles cover viewwidth.
FocalLengthX = CenterX / viewwindow.FocalTangent;
FocalLengthY = FocalLengthX * YaspectMul;
// This is 1/FocalTangent before the widescreen extension of FOV.
viewingrangerecip = FLOAT2FIXED(1. / tan(viewpoint.FieldOfView.Radians() / 2));
// Now generate xtoviewangle for sky texture mapping.
// [RH] Do not generate viewangletox, because texture mapping is no
// longer done with trig, so it's not needed.
const double slopestep = viewwindow.FocalTangent / viewwindow.centerx;
double slope;
for (i = viewwindow.centerx, slope = 0; i <= viewwidth; i++, slope += slopestep)
{
xtoviewangle[i] = angle_t((2 * M_PI - atan(slope)) * (ANGLE_180 / M_PI));
}
for (i = 0; i < viewwindow.centerx; i++)
{
xtoviewangle[i] = 0 - xtoviewangle[viewwidth - i - 1];
}
}
ExpVal EvalExpression(AActor *self)
{
double v = (*ArgList)[0]->EvalExpression(self).GetFloat();
ExpVal ret;
ret.Type = VAL_Float;
// shall we use the CRT's sin and cos functions?
angle_t angle = angle_t(v * ANGLE_90/90.);
if (Name == NAME_Sin) ret.Float = FIXED2DBL (finesine[angle>>ANGLETOFINESHIFT]);
else ret.Float = FIXED2DBL (finecosine[angle>>ANGLETOFINESHIFT]);
void HrtfData::get_direction_data(angle_t elevation, angle_t azimuth, distance_t distance, DirectionData& ref_data) const
{
_ASSERT(elevation >= -angle_t(pi * 0.5));
_ASSERT(elevation <= angle_t(pi * 0.5));
_ASSERT(azimuth >= -angle_t(2.0 * pi));
_ASSERT(azimuth <= angle_t(2.0 * pi));
const float azimuth_mod = std::fmod(azimuth + angle_t(pi * 2.0), angle_t(pi * 2.0));
const angle_t elevation_scaled = (elevation + angle_t(pi * 0.5)) * (m_elevations.size() - 1) / angle_t(pi);
const size_t elevation_index0 = static_cast<size_t>(elevation_scaled);
const size_t elevation_index1 = std::min(elevation_index0 + 1, m_elevations.size() - 1);
const float elevation_fractional_part = elevation_scaled - std::floor(elevation_scaled);
const angle_t azimuth_scaled0 = azimuth_mod * m_elevations[elevation_index0].azimuths.size() / angle_t(2 * pi);
const size_t azimuth_index00 = static_cast<size_t>(azimuth_scaled0) % m_elevations[elevation_index0].azimuths.size();
const size_t azimuth_index01 = static_cast<size_t>(azimuth_scaled0 + 1) % m_elevations[elevation_index0].azimuths.size();
const float azimuth_fractional_part0 = azimuth_scaled0 - std::floor(azimuth_scaled0);
const angle_t azimuth_scaled1 = azimuth_mod * m_elevations[elevation_index1].azimuths.size() / angle_t(2 * pi);
const size_t azimuth_index10 = static_cast<size_t>(azimuth_scaled1) % m_elevations[elevation_index1].azimuths.size();
const size_t azimuth_index11 = static_cast<size_t>(azimuth_scaled1 + 1) % m_elevations[elevation_index1].azimuths.size();
const float azimuth_fractional_part1 = azimuth_scaled1 - std::floor(azimuth_scaled1);
const float blend_factor_00 = (1.0f - elevation_fractional_part) * (1.0f - azimuth_fractional_part0);
const float blend_factor_01 = (1.0f - elevation_fractional_part) * azimuth_fractional_part0;
const float blend_factor_10 = elevation_fractional_part * (1.0f - azimuth_fractional_part1);
const float blend_factor_11 = elevation_fractional_part * azimuth_fractional_part1;
ref_data.delay =
m_elevations[elevation_index0].azimuths[azimuth_index00].delay * blend_factor_00
+ m_elevations[elevation_index0].azimuths[azimuth_index01].delay * blend_factor_01
+ m_elevations[elevation_index1].azimuths[azimuth_index10].delay * blend_factor_10
+ m_elevations[elevation_index1].azimuths[azimuth_index11].delay * blend_factor_11;
if (ref_data.impulse_response.size() < m_response_length)
ref_data.impulse_response.resize(m_response_length);
for (size_t i = 0; i < m_response_length; i++)
{
ref_data.impulse_response[i] =
m_elevations[elevation_index0].azimuths[azimuth_index00].impulse_response[i] * blend_factor_00
+ m_elevations[elevation_index0].azimuths[azimuth_index01].impulse_response[i] * blend_factor_01
+ m_elevations[elevation_index1].azimuths[azimuth_index10].impulse_response[i] * blend_factor_10
+ m_elevations[elevation_index1].azimuths[azimuth_index11].impulse_response[i] * blend_factor_11;
}
}
void HrtfData::sample_direction(angle_t elevation, angle_t azimuth, distance_t distance, uint32_t sample, float& value, float& delay) const
{
_ASSERT(elevation >= -angle_t(pi * 0.5));
_ASSERT(elevation <= angle_t(pi * 0.5));
_ASSERT(azimuth >= -angle_t(2.0 * pi));
_ASSERT(azimuth <= angle_t(2.0 * pi));
const float azimuth_mod = std::fmod(azimuth + angle_t(pi * 2.0), angle_t(pi * 2.0));
const angle_t elevation_scaled = (elevation + angle_t(pi * 0.5)) * (m_elevations.size() - 1) / angle_t(pi);
const size_t elevation_index0 = static_cast<size_t>(elevation_scaled);
const size_t elevation_index1 = std::min(elevation_index0 + 1, m_elevations.size() - 1);
const float elevation_fractional_part = elevation_scaled - std::floor(elevation_scaled);
const angle_t azimuth_scaled0 = azimuth_mod * m_elevations[elevation_index0].azimuths.size() / angle_t(pi * 2.0);
const size_t azimuth_index00 = static_cast<size_t>(azimuth_scaled0) % m_elevations[elevation_index0].azimuths.size();
const size_t azimuth_index01 = static_cast<size_t>(azimuth_scaled0 + 1) % m_elevations[elevation_index0].azimuths.size();
const float azimuth_fractional_part0 = azimuth_scaled0 - std::floor(azimuth_scaled0);
const angle_t azimuth_scaled1 = azimuth_mod * m_elevations[elevation_index1].azimuths.size() / angle_t(pi * 2.0);
const size_t azimuth_index10 = static_cast<size_t>(azimuth_scaled1) % m_elevations[elevation_index1].azimuths.size();
const size_t azimuth_index11 = static_cast<size_t>(azimuth_scaled1 + 1) % m_elevations[elevation_index1].azimuths.size();
const float azimuth_fractional_part1 = azimuth_scaled1 - std::floor(azimuth_scaled1);
const float blend_factor_00 = (1.0f - elevation_fractional_part) * (1.0f - azimuth_fractional_part0);
const float blend_factor_01 = (1.0f - elevation_fractional_part) * azimuth_fractional_part0;
const float blend_factor_10 = elevation_fractional_part * (1.0f - azimuth_fractional_part1);
const float blend_factor_11 = elevation_fractional_part * azimuth_fractional_part1;
delay =
m_elevations[elevation_index0].azimuths[azimuth_index00].delay * blend_factor_00
+ m_elevations[elevation_index0].azimuths[azimuth_index01].delay * blend_factor_01
+ m_elevations[elevation_index1].azimuths[azimuth_index10].delay * blend_factor_10
+ m_elevations[elevation_index1].azimuths[azimuth_index11].delay * blend_factor_11;
value =
m_elevations[elevation_index0].azimuths[azimuth_index00].impulse_response[sample] * blend_factor_00
+ m_elevations[elevation_index0].azimuths[azimuth_index01].impulse_response[sample] * blend_factor_01
+ m_elevations[elevation_index1].azimuths[azimuth_index10].impulse_response[sample] * blend_factor_10
+ m_elevations[elevation_index1].azimuths[azimuth_index11].impulse_response[sample] * blend_factor_11;
}
angle_t UDMFParserBase::CheckAngle(const char *key)
{
return angle_t(CheckFloat(key) * ANGLE_90 / 90.);
}