Oh boy... my fave part... simulating water!  You'll see on my YouTube channel I'm not new to this...

But let's not get carried away... I don't need water looking anywhere near as realistic for 'The Berg'.  A simple sub-divided plane and another vertex displacement shader will do the trick...

The problem I have is that I get 'hung up' on water.  I can fiddle for hours tweaking this and that.  MUST NOT DO THAT THIS TIME!!

...

Several days later...

	float step = viewSize / subdivisions;
	vec2 pp = vec2(playerPos.x, -playerPos.z);
	vec2 adjPlayerPos = floor(pp / step) * step;
	vec2 remainderPP = pp - adjPlayerPos;

	float uvScale = viewSize / mapSize;
	vec2 uvOffset = vec2(adjPlayerPos + (mapSize / 2.) - (viewSize / 2.)) / mapSize;
	vec2 newUV = uvOffset + uv * uvScale;

	float dOffset = 0.001;
	vec2 depths = vec2(0);
	depths.x = clamp(nSeaLevel - texture2D(heightMap, newUV + vec2(-dOffset, -dOffset)).r, 0., nSeaLevel) / nSeaLevel;
	depths.y = clamp(nSeaLevel - texture2D(heightMap, newUV + vec2(dOffset, dOffset)).r, 0., nSeaLevel) / nSeaLevel;
	float avDepth = (depths.x + depths.y) / 2.;

	float displace = 0.;

	vec2 waveOrigin[3];
	waveOrigin[0] = vec2(0.5, 0.5);
	waveOrigin[1] = vec2(0.3, 0.25);
	waveOrigin[2] = vec2(0.9, 0.75);

	float waveOriginDist[3];
	waveOriginDist[0] = distance( waveOrigin[0], newUV );
	waveOriginDist[1] = distance( waveOrigin[1], newUV );
	waveOriginDist[2] = distance( waveOrigin[2], newUV );

	vec2 t;

	for (int i = 0; i < 3; i++) {
		displace += cos( waveFreq * ( 1. / float(i + 1) ) * waveOriginDist[i] + (time * 2.)) * avDepth;
		displace += cos( waveFreq * avDepth * 2.5 * waveOriginDist[i] - (time * 1.5) ) * 0.5;

		t += normalize(newUV - waveOrigin[i]) * cos(time * 0.1);
	}
	displace *= avDepth;
	t *= 10.;

	vec2 adjVertPos = vec2( position.x - remainderPP.x, position.y - remainderPP.y );
	vec3 newPos = vec3( adjVertPos.x + t.x, adjVertPos.y + t.y, displace * heightScale );
	vec3 transformed = newPos;

What... have... I... done...?

What kind of monster have I created?

...

?

Just kidding....