Expose sunlight direction to post-processing (#8826)

Author: Capostrophic

CMakeLists.txt

@@ -83,7 +83,7 @@ set(OPENMW_VERSION_MAJOR 0)
 set(OPENMW_VERSION_MINOR 51)
 set(OPENMW_VERSION_RELEASE 0)
 set(OPENMW_LUA_API_REVISION 104)
-set(OPENMW_POSTPROCESSING_API_REVISION 3)
+set(OPENMW_POSTPROCESSING_API_REVISION 4)
 
 set(OPENMW_VERSION_COMMITHASH "")
 set(OPENMW_VERSION_TAGHASH "")

apps/openmw/mwrender/renderingmanager.cpp

@@ -739,6 +739,7 @@ namespace MWRender
         static const osg::Vec4f interiorSunPos
             = osg::Vec4f(-1.f, osg::DegreesToRadians(45.f), osg::DegreesToRadians(45.f), 0.f);
         mPostProcessor->getStateUpdater()->setSunPos(interiorSunPos, false);
+        mPostProcessor->getStateUpdater()->setSunVec(-interiorSunPos);
         mSunLight->setPosition(interiorSunPos);
     }
 
@@ -756,19 +757,18 @@ namespace MWRender
     {
         osg::Vec3f position = -direction;
 
-        // The sun is not synchronized with the sunlight because reasons
-        // This is based on exterior sun orbit and won't make sense for interiors, see WeatherManager::update
+        // This is based on the exterior sun orbit and won't make sense for interiors, see WeatherManager::update
         position.z() = 400.f - std::abs(position.x());
 
+        // The sun is not always synchronized with the sunlight because reasons
+        const osg::Vec3f sunlightPos = Settings::shaders().mMatchSunlightToSun ? position : -direction;
         // need to wrap this in a StateUpdater?
-        if (Settings::shaders().mMatchSunlightToSun)
-            mSunLight->setPosition(osg::Vec4f(position, 0.f));
-        else
-            mSunLight->setPosition(osg::Vec4f(-direction, 0.f));
+        mSunLight->setPosition(osg::Vec4f(sunlightPos, 0.f));
 
         mSky->setSunDirection(position);
 
         mPostProcessor->getStateUpdater()->setSunPos(osg::Vec4f(position, 0.f), mNight);
+        mPostProcessor->getStateUpdater()->setSunVec(osg::Vec4f(-sunlightPos, 0.f));
     }
 
     void RenderingManager::addCell(const MWWorld::CellStore* store)

components/fx/stateupdater.hpp

@@ -49,6 +49,12 @@ namespace Fx
                 mData.get<SunPos>().z() *= -1.f;
         }
 
+        void setSunVec(const osg::Vec4f& vec)
+        {
+            mData.get<SunVec>() = vec;
+            mData.get<SunVec>().normalize();
+        }
+
         void setResolution(const osg::Vec2f& size)
         {
             mData.get<Resolution>() = size;
@@ -170,6 +176,11 @@ namespace Fx
             static constexpr std::string_view sName = "sunPos";
         };
 
+        struct SunVec : Std140::Vec4
+        {
+            static constexpr std::string_view sName = "sunVec";
+        };
+
         struct Resolution : Std140::Vec2
         {
             static constexpr std::string_view sName = "resolution";
@@ -270,11 +281,11 @@ namespace Fx
             static constexpr std::string_view sName = "isInterior";
         };
 
-        using UniformData
-            = Std140::UBO<ProjectionMatrix, InvProjectionMatrix, ViewMatrix, PrevViewMatrix, InvViewMatrix, EyePos,
-                EyeVec, FogColor, AmbientColor, SkyColor, SunColor, SunPos, Resolution, RcpResolution, FogNear, FogFar,
-                Near, Far, Fov, GameHour, SunVis, WaterHeight, IsWaterEnabled, SimulationTime, DeltaSimulationTime,
-                FrameNumber, WindSpeed, WeatherTransition, WeatherID, NextWeatherID, IsUnderwater, IsInterior>;
+        using UniformData = Std140::UBO<ProjectionMatrix, InvProjectionMatrix, ViewMatrix, PrevViewMatrix,
+            InvViewMatrix, EyePos, EyeVec, FogColor, AmbientColor, SkyColor, SunColor, SunPos, SunVec, Resolution,
+            RcpResolution, FogNear, FogFar, Near, Far, Fov, GameHour, SunVis, WaterHeight, IsWaterEnabled,
+            SimulationTime, DeltaSimulationTime, FrameNumber, WindSpeed, WeatherTransition, WeatherID, NextWeatherID,
+            IsUnderwater, IsInterior>;
 
         UniformData mData;
         bool mUseUBO;

docs/source/reference/postprocessing/omwfx.rst

@@ -73,9 +73,11 @@ Builtin Uniforms
 +-------------+------------------------------+--------------------------------------------------+
 | vec4        | ``omw.sunColor``             | The RGBA color of sun                            |
 +-------------+------------------------------+--------------------------------------------------+
-| vec4        | ``omw.sunPos``               | The normalized sun direction                     |
+| vec4        | ``omw.sunPos``               | The normalized sun disc position                 |
 |             |                              |                                                  |
-|             |                              | When the sun is set `omw.sunpos.z` is negated    |
+|             |                              | When the sun is set `omw.sunPos.z` is negated    |
++-------------+------------------------------+--------------------------------------------------+
+| vec4        | ``omw.sunVec``               | The normalized sunlight direction                |
 +-------------+------------------------------+--------------------------------------------------+
 | vec2        | ``omw.resolution``           | The render target's resolution                   |
 +-------------+------------------------------+--------------------------------------------------+