refined sun, added ability to grab input without full screening

1 files changed, 8 insertions, 4 deletions

diff --git a/shaders/sky.frag b/shaders/sky.frag
index c81c8b0..6d47adb 100644
--- a/shaders/sky.frag
+++ b/shaders/sky.frag
@@ -13,17 +13,21 @@ uniform sampler2D night_tex ;
 in vec2 texcoord;
 in vec4 position ;
 
+float exp1( float x ) {
+    return 2 / (1+exp(-x))-1;
+}
 void main() {  
     // the sun
     
     vec3 lighttofrag = vec3(position*10000000 - lightpos) ;
     vec3 lighttocamera = vec3(lightpos) ;
-    vec4 mul = vec4(vec3( sqrt(0.001 / (1 - dot(normalize(lighttocamera), normalize(lighttofrag))))), 1) ;
-    mul *= vec4(1.0,0.95,0.8,1.0) ;
+    float coef = 1 - dot(normalize(lighttocamera), normalize(lighttofrag));
+    vec4 mul = vec4(vec3( pow(0.0005 / coef,0.8)), 1) ;
+    mul *= vec4(1.0,0.85,0.5,1.0) ;
     frag_color = 
         mix(texture2D(night_tex,texcoord) * (1-globalAmbient.a),
             texture2D(texture,texcoord) * vec4(normalize(globalAmbient.xyz),1),
-            (globalAmbient.a + 1) / 2) ;
-    frag_color += mul ;
+            (globalAmbient.a + 1) / 2) * 1.8 ;
+    frag_color = frag_color + mul ;
 
 }