shader.frag
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	precision highp float;
	in vec2 texCoordHack;
	const float texCoordHackScale = 0.05;

	uniform vec4 CameraEye;
	uniform vec4 FogColor;
	uniform vec2 FogBounds;

	uniform sampler2D causticsTexture;
	uniform float time;
	uniform float causticsScale;
	uniform float causticsAmount;

	const float timeScale = 0.04;

	in vec4 sVertex;

	float getFogFactor(float d) {
	float FogMax = FogBounds.y;
	float FogMin = FogBounds.x;

	if (d>=FogMax) return 1.0;
	if (d<=FogMin) return 0.0;

	return 1.0 - pow((FogMax - d) / (FogMax - FogMin), 3.0);
	}

	vec4 color(vec4 graphicsColor, sampler2D image, vec2 uv) {
	vec4 c = graphicsColor * lovrDiffuseColor * vertexColor * texture(image, uv);

	// apply caustics
	float t = time * timeScale;
	vec2 texUV = texCoordHack;
	c += min(
	texture(causticsTexture, texUV / texCoordHackScale * causticsScale + vec2(t, 2.0 + t)),
	texture(causticsTexture, texUV / texCoordHackScale * causticsScale + vec2(-t / 2.0, -t))
	) * 2.0 * causticsAmount;

	// apply fog
	float d = distance(CameraEye, sVertex);
	float alpha = getFogFactor(d);
	c = mix(c, FogColor, alpha);

	return c;
	}