Forget to add transparentfog.frag shader.

data/shaders/transparentfog.frag

@@ -0,0 +1,32 @@
+#version 130
+uniform sampler2D tex;
+
+uniform float fogmax;
+uniform float startH;
+uniform float endH;
+uniform float start;
+uniform float end;
+uniform vec3 col;
+uniform mat4 ipvmat;
+uniform vec2 screen;
+
+in vec2 uv;
+out vec4 FragColor;
+
+void main()
+{
+	vec4 color = texture(tex, uv);
+	vec3 tmp = vec3(gl_FragCoord.xy / screen, gl_FragCoord.z);
+	tmp = 2. * tmp - 1.;
+
+	vec4 xpos = vec4(tmp, 1.0);
+	xpos = ipvmat * xpos;
+	xpos.xyz /= xpos.w;
+
+	float dist = length(xpos.xyz);
+	float fog = smoothstep(start, end, dist);
+
+	fog = min(fog, fogmax);
+
+	FragColor = vec4(vec4(col, 1.) * fog + color *(1. - fog));
+}