Atmospherics WIP

libatmosphere integrated in indra/llrender/llatmosphere.cpp

Still working on runtime shaders to use libatmosphere precomputed atmospherics textures

1 files changed, 20 insertions, 0 deletions

diff --git a/indra/llmath/llquaternion.cpp b/indra/llmath/llquaternion.cpp
index dcef2b345e..a8d9eba2a0 100644
--- a/indra/llmath/llquaternion.cpp
+++ b/indra/llmath/llquaternion.cpp
@@ -864,6 +864,26 @@ void LLQuaternion::getAngleAxis(F32* angle, LLVector3 &vec) const
 	}
 }
 
+const LLQuaternion& LLQuaternion::setFromAzimuthAndAltitude(F32 azimuthRadians, F32 altitudeRadians)
+{
+    // euler angle inputs are complements of azimuth/altitude which are measured from zenith
+    F32 pitch = llclamp(F_PI_BY_TWO - altitudeRadians, 0.0f, F_PI_BY_TWO);
+    F32 yaw   = llclamp(F_PI_BY_TWO - azimuthRadians,  0.0f, F_PI_BY_TWO);
+    setEulerAngles(0.0f, pitch, yaw);
+    return *this;
+}
+
+void LLQuaternion::getAzimuthAndAltitude(F32 &azimuthRadians, F32 &altitudeRadians)
+{
+    F32 rick_roll;
+    F32 pitch;
+    F32 yaw;
+    getEulerAngles(&rick_roll, &pitch, &yaw);
+    // make these measured from zenith
+    altitudeRadians = llclamp(F_PI_BY_TWO - pitch, 0.0f, F_PI_BY_TWO);
+    azimuthRadians  = llclamp(F_PI_BY_TWO - yaw,   0.0f, F_PI_BY_TWO);
+}
+
 // quaternion does not need to be normalized
 void LLQuaternion::getEulerAngles(F32 *roll, F32 *pitch, F32 *yaw) const
 {