Clip posteffect color to respective nodes

client/shaders/nodes_shader/opengl_vertex.glsl

@@ -171,6 +171,7 @@ void main(void)
 	// Generate waves with Perlin-type noise.
 	// The constants are calibrated such that they roughly
 	// correspond to the old sine waves.
+	// Note: The same thing is implemented in clientmap.cpp. Keep them consistent!
 	vec3 wavePos = (mWorld * pos).xyz + cameraOffset;
 	// The waves are slightly compressed along the z-axis to get
 	// wave-fronts along the x-axis.

client/shaders/object_shader/opengl_fragment.glsl

@@ -5,6 +5,9 @@ uniform lowp vec4 fogColor;
 uniform float fogDistance;
 uniform float fogShadingParameter;
 
+// Only used for the wieldhand. 0 otherwise.
+uniform vec4 wield_posteffect_color;
+
 // The cameraOffset is the current center of the visible world.
 uniform highp vec3 cameraOffset;
 uniform float animationTimer;
@@ -458,5 +461,12 @@ void main(void)
 	col = mix(fogColor * pow(fogColor / fogColorMax, vec4(2.0 * clarity)), col, clarity);
 	col = vec4(col.rgb, base.a);
 
+	// Apply posteffect color for the wieldhand, by blending it above this
+	// fragment.
+	// The alpha channel is not blended. The posteffect geometry behind the
+	// wieldhand already makes the image less transparent.
+	// wield_posteffect_color.rgb is premultiplied.
+	col.rgb = col.rgb * (1.0 - wield_posteffect_color.a) + wield_posteffect_color.rgb;
+
 	gl_FragData[0] = col;
 }