Make rain rate variable and remove randomness/dithering. GUI still ne…

…eded

With the higher bit depth the rain dithering is not necessary anymore.
It did look cool, but for the cool looks it would be better to add an effect
in visualisation.

to set rain rate from console:
>> raining=x
with x = rain rate in m per simulation step. Default: 0.001, 1mm per simulation step

glsl/automaton.fsh

@@ -28,7 +28,7 @@ uniform float dv; // the height of the cells
 
 const float outflowrange = 10.0; // defines the resolution of outflow as it is only 8bit
 
-uniform int rain;
+uniform float rain;
 uniform float lastX;
 uniform float lastY;
 uniform float currX;
@@ -64,18 +64,6 @@ float waterlevel(int dir) {
 	return 255.0*texture2D(waterlevelMap, coord(dir)).r + texture2D(waterlevelMap, coord(dir)).g;
 }
 
-int rand(vec2 co, int max) {
-	float a = 12.9898;
-	float b = 78.233;
-	float c = 43758.5453;
-	float dt = dot(co.xy ,vec2(a,b));
-	float sn = mod(dt, 3.14);
-	int rnd = int(float(max)*fract(abs(sin(sn) * c)));
-	if (rnd<0) rnd = 0;
-	if (rnd>=max) rnd = max-1;
-	return rnd;
-}
-
 void main() {
 	if (pass == 0) {
 		float flowfactor = 0.0;
@@ -136,7 +124,7 @@ void main() {
 		}
 
 		// apply raining...
-		if ((rain==1) && (rand(coord(rseed), 8)==0)) level += 0.1;
+		level += rain;
 
 		// apply sources and sinks
 		vec2 scale = vec2(1, du/dv);

index.html

@@ -191,7 +191,7 @@
 			var zmin, zmax;
 			var nodata;
 			var dw = 0.1;
-			var raining = false;
+			var raining = 0.0;
 			var simulate = false;
 			var maxSources = 16;
 			var sourcesCoordList = new Float32Array(32);
@@ -561,8 +561,8 @@
 			}
 
 			function togglerain(obj) {
-				raining = !raining;
-				document.getElementById('rainicon').src = raining ? 'img/rainon.svg' : 'img/rainoff.svg';
+				raining = raining? 0.0 : 0.001;
+				document.getElementById('rainicon').src = raining > 0 ? 'img/rainon.svg' : 'img/rainoff.svg';
 			}
 
 			var simfunc;

js/mapmind.js

@@ -125,7 +125,7 @@ function ahnSimulate() {
 	gl.uniform1f(gl.getUniformLocation(shaderAutomaton, "dv"), 1.0/height); // pass in the height of the cells
 	gl.uniform1f(gl.getUniformLocation(shaderAutomaton, "dw"), dw); // pass water increment
 
-	gl.uniform1i(gl.getUniformLocation(shaderAutomaton, "rain"), raining ? 1 : 0);
+	gl.uniform1f(gl.getUniformLocation(shaderAutomaton, "rain"), raining);
 
 	gl.uniform1i(gl.getUniformLocation(shaderAutomaton, "nSources"), sourcesList.getFeatures().length);
 	gl.uniform2fv(gl.getUniformLocation(shaderAutomaton, "sourceCoords"), sourcesCoordList);