Pass keylight direction as parameter to the shader.

libraries/render-utils/src/DeferredGlobalLight.slh

@@ -221,7 +221,8 @@ vec3 evalGlobalLightingAlphaBlendedWithHaze(
             vec4(color, 1.0),               // fragment original color
             position,                       // fragment position in eye   coordinates
             fragEyeVector,                  // fragment position in world coordinates
-            invViewMat[3].y                 // eye      height   in world coordinates
+            invViewMat[3].y,                // eye      height   in world coordinates
+            lightDirection                  // keylight direction vector
         );
 
         color = colorV4.rgb;

libraries/render-utils/src/Haze.slf

@@ -53,6 +53,8 @@ void main(void) {
     vec4 worldFragPos = viewInverse * eyeFragPos;
     vec4 worldEyePos = viewInverse[3];
 
-    outFragColor = computeHazeColor(fragColor, eyeFragPos.xyz, worldFragPos.xyz, worldEyePos.y);
+    Light light = getLight();
-}
+    vec3 lightDirection = getLightDirection(light);
 
+    outFragColor = computeHazeColor(fragColor, eyeFragPos.xyz, worldFragPos.xyz, worldEyePos.y, lightDirection);
+}

libraries/render-utils/src/Haze.slh

@@ -43,7 +43,7 @@ layout(std140) uniform hazeBuffer {
 
 // Input:
 //      color               - fragment original color
-//      directionalLight    - parameters of the keylight
+//      lightDirection      - parameters of the keylight
 //      worldFragPos        - fragment position in world coordinates
 // Output:
 //      fragment colour after haze effect
@@ -101,7 +101,7 @@ vec3 computeHazeColorKeyLightAttenuation(vec3 color, vec3 lightDirection, vec3 w
 //
 // General algorithm taken from http://www.iquilezles.org/www/articles/fog/fog.htm, with permission
 //
-vec4 computeHazeColor(vec4 fragColor, vec3 eyeFragPos, vec3 worldFragPos, float worldEyeHeight) {
+vec4 computeHazeColor(vec4 fragColor, vec3 eyeFragPos, vec3 worldFragPos, float worldEyeHeight, vec3 lightDirection) {
     // Distance to fragment 
     float distance = length(eyeFragPos);
 
@@ -111,9 +111,6 @@ vec4 computeHazeColor(vec4 fragColor, vec3 eyeFragPos, vec3 worldFragPos, float
     // Directional light component is a function of the angle from the eye, between the fragment and the sun
     vec3 eyeFragDir = normalize(worldFragPos);
 
-    Light light = getLight();
-    vec3 lightDirection = getLightDirection(light);
-
     float glareComponent = max(0.0, dot(eyeFragDir, -lightDirection));
     float power = min(1.0, pow(glareComponent, hazeParams.hazeGlareBlend));