Added water shader

water/Caustic.png.import

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water/Water.shader

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+/*
+Realistic Water Shader for GODOT 3.1.1
+
+Copyright (c) 2019 UnionBytes, Achim Menzel (alias AiYori)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this 
+software and associated documentation files (the "Software"), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify,
+merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
+OR OTHER DEALINGS IN THE SOFTWARE.
+
+-- UnionBytes <https://www.unionbytes.de/>
+-- YouTube: <https://www.youtube.com/user/UnionBytes>
+*/
+
+
+// For this shader min. GODOT 3.1.1 is required, because 3.1 has a depth buffer bug!
+shader_type 	spatial;
+render_mode 	cull_back,diffuse_burley,specular_schlick_ggx, blend_mix;
+
+
+// Wave settings:
+uniform float	wave_speed		 = 0.5; // Speed scale for the waves
+uniform vec4	wave_a			 = vec4(1.0, 1.0, 0.35, 3.0); 	// xy = Direction, z = Steepness, w = Length
+uniform	vec4	wave_b			 = vec4(1.0, 0.6, 0.30, 1.55);	// xy = Direction, z = Steepness, w = Length
+uniform	vec4	wave_c			 = vec4(1.0, 1.3, 0.25, 0.9); 	// xy = Direction, z = Steepness, w = Length
+
+// Surface settings:
+uniform vec2 	sampler_scale 	 = vec2(0.25, 0.25); 			// Scale for the sampler
+uniform vec2	sampler_direction= vec2(0.05, 0.04); 			// Direction and speed for the sampler offset
+
+uniform sampler2D uv_sampler : hint_aniso; 						// UV motion sampler for shifting the normalmap
+uniform vec2 	uv_sampler_scale = vec2(0.25, 0.25); 			// UV sampler scale
+uniform float 	uv_sampler_strength = 0.04; 					// UV shifting strength
+
+uniform sampler2D normalmap_a_sampler : hint_normal;			// Normalmap sampler A
+uniform sampler2D normalmap_b_sampler : hint_normal;			// Normalmap sampler B
+
+uniform sampler2D foam_sampler : hint_black;					// Foam sampler
+uniform float 	foam_level 		 = 0.5;							// Foam level -> distance from the object (0.0 - 0.5)
+
+// Volume settings:
+uniform float 	refraction 		 = 0.075;						// Refraction of the water
+
+uniform vec4 	color_deep : hint_color;						// Color for deep places in the water, medium to dark blue
+uniform vec4 	color_shallow : hint_color;						// Color for lower places in the water, bright blue - green
+uniform float 	beers_law		 = 2.0;						// Beers law value, regulates the blending size to the deep water level
+uniform float 	depth_offset	 = -0.75;						// Offset for the blending
+
+// Projector for the water caustics:
+uniform mat4	projector;										// Projector matrix, mostly the matric of the sun / directlight
+uniform sampler2DArray caustic_sampler : hint_black;			// Caustic sampler, (Texture array with 16 Textures for the animation)
+
+
+// Vertex -> Fragment:
+varying float 	vertex_height;									// Height of the water surface
+varying vec3 	vertex_normal;									// Vertex normal -> Needed for refraction calculation
+varying vec3 	vertex_binormal;								// Vertex binormal -> Needed for refraction calculation
+varying vec3 	vertex_tangent;									// Vertex tangent -> Needed for refraction calculation
+
+varying mat4 	inv_mvp; 										// Inverse ModelViewProjection matrix -> Needed for caustic projection
+varying vec3	vertex_pos;
+
+
+// Wave function:
+vec4 wave(vec4 parameter, vec2 position, float time, inout vec3 tangent, inout vec3 binormal)
+{
+	float	wave_steepness	 = parameter.z;
+	float	wave_length		 = parameter.w;
+
+	float	k				 = 2.0 * 3.14159265359 / wave_length;
+	float 	c 				 = sqrt(9.8 / k);
+	vec2	d				 = normalize(parameter.xy);
+	float 	f 				 = k * (dot(d, position) - c * time);
+	float 	a				 = wave_steepness / k;
+	
+	tangent			+= normalize(vec3(1.0-d.x * d.x * (wave_steepness * sin(f)), d.x * (wave_steepness * cos(f)), -d.x * d.y * (wave_steepness * sin(f))));
+	binormal		+= normalize(vec3(-d.x * d.y * (wave_steepness * sin(f)), d.y * (wave_steepness * cos(f)), 1.0-d.y * d.y * (wave_steepness * sin(f))));
+
+	return vec4(d.x * (a * cos(f)), a * sin(f) * 0.25, d.y * (a * cos(f)), 0.0);
+}
+
+
+// Vertex shader:
+void vertex()
+{
+	float	time			 = TIME * wave_speed;
+
+	vec4	vertex			 = vec4(VERTEX, 1.0);
+	vec3	vertex_position  = (WORLD_MATRIX * vertex).xyz;
+	
+	vertex_tangent 	 = vec3(0.0, 0.0, 0.0);
+	vertex_binormal  = vec3(0.0, 0.0, 0.0);
+			
+	vec3 tmp_tangent = vertex_tangent;
+	vec3 tmp_binormal = vertex_binormal;
+	vertex 			+= wave(wave_a, vertex_position.xz, time, tmp_tangent, tmp_binormal);
+	vertex 			+= wave(wave_b, vertex_position.xz, time, tmp_tangent, tmp_binormal);
+	vertex 			+= wave(wave_c, vertex_position.xz, time, tmp_tangent, tmp_binormal);
+	vertex_tangent = tmp_tangent;
+	vertex_binormal = tmp_binormal;
+	
+	vertex_position  = vertex.xyz;
+	
+	vertex_height	 = (PROJECTION_MATRIX * MODELVIEW_MATRIX * vertex).z;
+	
+	TANGENT			 = vertex_tangent;
+	BINORMAL		 = vertex_binormal;
+	vertex_normal	 = normalize(cross(vertex_binormal, vertex_tangent));
+	NORMAL			 = vertex_normal;
+
+	UV				 = vertex.xz * sampler_scale;
+
+	VERTEX			 = vertex.xyz;
+
+	inv_mvp = inverse(PROJECTION_MATRIX * MODELVIEW_MATRIX);
+	vertex_pos = vertex_position;
+}
+
+
+// Fragment shader:
+void fragment()
+{
+	// Calculation of the UV with the UV motion sampler
+	vec2	uv_offset 					 = sampler_direction * TIME;
+	vec2 	uv_sampler_uv 				 = UV * uv_sampler_scale + uv_offset;
+	vec2	uv_sampler_uv_offset 		 = uv_sampler_strength * texture(uv_sampler, uv_sampler_uv).rg * 2.0 - 1.0;
+	vec2 	uv 							 = UV + uv_sampler_uv_offset;
+	
+	// Normalmap:
+	vec3 normalmap = texture(normalmap_a_sampler, uv  - uv_offset * 2.0 + vertex_pos.xz).rgb * 0.75; // 75 % sampler A
+		normalmap += texture(normalmap_b_sampler, uv  + uv_offset + vertex_pos.xz).rgb * 0.25; // 25 % sampler B
+//	vec3 normalmap = texture(normalmap_b_sampler, uv + uv_offset).rgb;
+	
+	// Refraction UV:
+	vec3	ref_normalmap				 = normalmap * 2.0 - 1.0;
+			ref_normalmap				 = normalize(vertex_tangent*ref_normalmap.x + vertex_binormal*ref_normalmap.y + vertex_normal*ref_normalmap.z);
+	vec2 	ref_uv						 = SCREEN_UV + (ref_normalmap.xy * refraction) / vertex_height;
+	
+	// Ground depth:
+	float 	depth_raw					 = texture(DEPTH_TEXTURE, ref_uv).r * 2.0 - 1.0;
+	float	depth						 = PROJECTION_MATRIX[3][2] / (depth_raw + PROJECTION_MATRIX[2][2]);
+			
+	float 	depth_blend 				 = exp((depth+VERTEX.z + depth_offset) * -beers_law);
+			depth_blend 				 = clamp(1.0-depth_blend, 0.0, 1.0);	
+	float	depth_blend_pow				 = clamp(pow(depth_blend, 2.5), 0.0, 1.0);
+
+	// Ground color:
+	vec3 	screen_color 				 = textureLod(SCREEN_TEXTURE, ref_uv, depth_blend_pow * 2.5).rgb;
+	
+	vec3 	dye_color 					 = mix(color_shallow.rgb, color_deep.rgb, depth_blend_pow);
+	vec3	color 						 = mix(screen_color*dye_color, dye_color*0.25, depth_blend_pow*0.5);
+	
+	// Caustic screen projection
+	vec4 	caustic_screenPos 			 = vec4(ref_uv*2.0-1.0, depth_raw, 1.0);
+	vec4 	caustic_localPos 			 = inv_mvp * caustic_screenPos;
+			caustic_localPos			 = vec4(caustic_localPos.xyz/caustic_localPos.w, caustic_localPos.w);
+	
+	vec2 	caustic_Uv 				 = caustic_localPos.xz / vec2(1024.0) + 0.5;
+	vec4	caustic_color				 = texture(caustic_sampler, vec3(caustic_Uv*300.0, mod(TIME*14.0, 16.0)));
+
+	color *= 1.0 + pow(caustic_color.r, 1.50) * (1.0-depth_blend) * 6.0;
+
+	// Foam:
+	if(depth + VERTEX.z < foam_level && depth > vertex_height-0.1)
+	{
+		float foam_noise = clamp(pow(texture(foam_sampler, (uv * 4.0) - uv_offset).r, 10.0)*40.0, 0.0, 0.2);
+		float foam_mix = clamp(pow((1.0-(depth + VERTEX.z) + foam_noise), 8.0) * foam_noise * 0.4, 0.0, 1.0);
+		color = mix(color, vec3(1.0), foam_mix);
+	}
+	
+	// Set all values:
+	ALBEDO = color;
+	METALLIC = 0.1;
+	ROUGHNESS = 0.2;
+	SPECULAR = 0.2 + depth_blend_pow * 0.4;
+	NORMALMAP = normalmap;
+	NORMALMAP_DEPTH = 0.3;
+}

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