GLSL hidden

gistfile1.txt

uniform sampler2D sky_texture;

  uniform int hidden;
	uniform float time;

	varying vec2 vUv;
	varying vec3 vPosition;
	varying float vHeightmap;

	void main()
	{

		vec2 sky_uv = vUv;
		sky_uv.x += (sin(radians(time / 800.0)));
		if (sky_uv.x < 0.0) {
			sky_uv.x = 1.0 + sky_uv.x;
		}
		if (sky_uv.x > 1.0) {
			sky_uv.x = sky_uv.x - 1.0;
		}

		sky_uv.y += (sin(radians(time / 900.0)));
		if (sky_uv.y < 0.0) {
			sky_uv.y = 1.0 + sky_uv.y;
		}
		if (sky_uv.y > 1.0) {
			sky_uv.y = sky_uv.y - 1.0;
		}

		vec3 sky_point_color = texture2D ( sky_texture, sky_uv ).rgb;
		vec4 sky_point = vec4(sky_point_color, sky_point_color.r);

		gl_FragColor = vec4(.0, .2, .6, .6);

		gl_FragColor = mix(
			gl_FragColor,
			sky_point,
			.8
		);

		gl_FragColor.a = min((-2.0 * vHeightmap) + .05, 1.0);


		// Determine at what point the elevation must be for the foam to display
		float low_tide = -.01;

		float low_tide_1 = low_tide + sin(radians(time / 10.0)) * .001; // Mostly animation speed
		float tide_1_width = .001;

		float low_tide_2 = low_tide + sin(radians(time / 6.0)) * .003; // Mostly animation speed
		float tide_2_width = .002;

		if (
			(vHeightmap >= low_tide_1 && vHeightmap <= low_tide_1 + tide_1_width)
			||
			(vHeightmap >= low_tide_2 && vHeightmap <= low_tide_2 + tide_2_width)
			) {
			// Foam color
			gl_FragColor = mix(
				gl_FragColor,
				vec4(1.0, 1.0, 1.0, 1.0),
				1.0 - (vHeightmap * -60.0)
			);
		}

		if (hidden == 1) {
			gl_FragColor.a = .2;
		}


	}