New fog shader

Signed-off-by: Vivian Meazza <vivian.meazza@lineone.net>

Shaders/include_fog.frag

@@ -0,0 +1,19 @@
+//#define FOG_FUNCTION
+//default fog
+//varying float fogCoord;
+varying vec3 PointPos;
+//varying vec4 EyePos;
+
+vec3 fog_Func(vec3 color, int type)
+{
+	//if (type == 0){
+		const float LOG2 = 1.442695;
+		//vec3 EyePos = vec3(0.0);
+		float fogCoord =length(PointPos);
+		float fogFactor = exp2(-gl_Fog.density * gl_Fog.density * fogCoord * fogCoord * LOG2);
+
+		if(gl_Fog.density == 1.0)
+			fogFactor=1.0;
+
+		return mix(gl_Fog.color.rgb, color, fogFactor);
+}

Shaders/include_fog.vert

@@ -0,0 +1,11 @@
+//varying float fogCoord;
+varying vec3 PointPos;
+//varying vec4 EyePos;
+
+void fog_func(int type)
+{
+    PointPos = (gl_ModelViewMatrix * gl_Vertex).xyz;
+    //PointPos = gl_Vertex;
+    //EyePos = gl_ModelViewMatrixInverse * vec4(0.0,0.0,0.0,1.0);
+		//fogCoord = abs(ecPosition.z);
+}