refactor res/shaders

res/shaders/lib/commons.glsl

@@ -1,12 +1,27 @@
+#ifndef COMMONS_GLSL_
+#define COMMONS_GLSL_
+
+#include <constants>
+
 #define PI 3.1415926535897932384626433832795
 #define PI2 (PI*2)
 
 vec4 decompress_light(float compressed_light) {
-	vec4 result;
+    vec4 result;
     int compressed = floatBitsToInt(compressed_light);
     result.r = ((compressed >> 24) & 0xFF) / 255.f;
     result.g = ((compressed >> 16) & 0xFF) / 255.f;
     result.b = ((compressed >> 8) & 0xFF) / 255.f;
     result.a = (compressed & 0xFF) / 255.f;
-	return result;
+    return result;
 }
+
+vec3 pick_sky_color(samplerCube cubemap) {
+    vec3 skyLightColor = texture(cubemap, vec3(0.4f, 0.0f, 0.4f)).rgb;
+    skyLightColor *= SKY_LIGHT_TINT;
+    skyLightColor = min(vec3(1.0), skyLightColor*SKY_LIGHT_MUL);
+    skyLightColor = max(MAX_SKY_LIGHT, skyLightColor);
+    return skyLightColor;
+}
+
+#endif // COMMONS_GLSL_

res/shaders/lib/constants.glsl

@@ -0,0 +1,15 @@
+#ifndef CONSTANTS_GLSL_
+#define CONSTANTS_GLSL_
+
+// geometry
+#define CURVATURE_FACTOR 0.002
+
+// lighting
+#define SKY_LIGHT_MUL 2.5
+#define SKY_LIGHT_TINT vec3(0.9, 0.8, 1.0)
+#define MAX_SKY_LIGHT vec3(0.1, 0.11, 0.14)
+
+// fog
+#define FOG_POS_SCALE vec3(1.0, 0.2, 1.0)
+
+#endif // CONSTANTS_GLSL_