265 lines
8.8 KiB
GLSL
265 lines
8.8 KiB
GLSL
// Deferred water based on shader by Wojciech Toman
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// http://www.gamedev.net/page/resources/_/technical/graphics-programming-and-theory/rendering-water-as-a-post-process-effect-r2642
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// Seascape https://www.shadertoy.com/view/Ms2SD1
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// Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
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#version 450
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#include "compiled.inc"
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#include "std/gbuffer.glsl"
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// #include "std/math.glsl"
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uniform sampler2D gbufferD;
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// uniform sampler2D gbuffer0;
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// uniform sampler2D senvmapRadiance;
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uniform sampler2D snoise;
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uniform float time;
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uniform vec3 eye;
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uniform vec3 eyeLook;
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uniform vec2 cameraProj;
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uniform vec3 ld;
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uniform float envmapStrength;
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in vec2 texCoord;
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in vec3 viewRay;
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in vec3 vecnormal;
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out vec4 fragColor;
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float hash(vec2 p) {
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float h = dot(p, vec2(127.1, 311.7));
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return fract(sin(h) * 43758.5453123);
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}
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float noise(vec2 p) {
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vec2 i = floor(p);
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vec2 f = fract(p);
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vec2 u = f * f * (3.0 - 2.0 * f);
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return -1.0 + 2.0 * mix(
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mix(hash(i + vec2(0.0, 0.0)),
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hash(i + vec2(1.0, 0.0)), u.x),
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mix(hash(i + vec2(0.0, 1.0)),
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hash(i + vec2(1.0, 1.0)), u.x), u.y);
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}
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// float noise(vec2 xx) {
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// return -1.0 + 2.0 * texture(snoise, xx / 20.0).r;
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// }
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float seaOctave(vec2 uv, float choppy) {
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uv += noise(uv);
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vec2 wv = 1.0 - abs(sin(uv));
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vec2 swv = abs(cos(uv));
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wv = mix(wv, swv, wv);
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return pow(1.0 - pow(wv.x * wv.y, 0.65), choppy);
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}
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const mat2 octavem = mat2(1.6, 1.2, -1.2, 1.6);
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float map(vec3 p) {
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float freq = seaFreq;
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float amp = seaHeight;
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float choppy = seaChoppy;
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vec2 uv = p.xy;
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uv.x *= 0.75;
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float d, h = 0.0;
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// for(int i = 0; i < 2; i++) {
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d = seaOctave((uv + (time * seaSpeed)) * freq, choppy);
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d += seaOctave((uv - (time * seaSpeed)) * freq, choppy);
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h += d * amp;
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uv *= octavem; freq *= 1.9; amp *= 0.22;
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choppy = mix(choppy, 1.0, 0.2);
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//
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d = seaOctave((uv + (time * seaSpeed)) * freq, choppy);
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d += seaOctave((uv-(time * seaSpeed)) * freq, choppy);
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h += d * amp;
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uv *= octavem; freq *= 1.9; amp *= 0.22;
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choppy = mix(choppy, 1.0, 0.2);
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//
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// }
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return p.z - h;
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}
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float mapDetailed(vec3 p) {
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float freq = seaFreq;
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float amp = seaHeight;
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float choppy = seaChoppy;
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vec2 uv = p.xy; uv.x *= 0.75;
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float d, h = 0.0;
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// for(int i = 0; i < 4; i++) {
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d = seaOctave((uv + (time * seaSpeed)) * freq,choppy);
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d += seaOctave((uv - (time * seaSpeed)) * freq,choppy);
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h += d * amp;
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uv *= octavem; freq *= 1.9; amp *= 0.22;
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choppy = mix(choppy, 1.0, 0.2);
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//
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d = seaOctave((uv + (time * seaSpeed)) * freq,choppy);
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d += seaOctave((uv - (time * seaSpeed)) * freq,choppy);
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h += d * amp;
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uv *= octavem; freq *= 1.9; amp *= 0.22;
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choppy = mix(choppy, 1.0, 0.2);
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d = seaOctave((uv + (time * seaSpeed)) * freq,choppy);
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d += seaOctave((uv - (time * seaSpeed)) * freq,choppy);
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h += d * amp;
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uv *= octavem; freq *= 1.9; amp *= 0.22;
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choppy = mix(choppy, 1.0, 0.2);
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d = seaOctave((uv + (time * seaSpeed)) * freq,choppy);
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d += seaOctave((uv - (time * seaSpeed)) * freq,choppy);
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h += d * amp;
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uv *= octavem; freq *= 1.9; amp *= 0.22;
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choppy = mix(choppy, 1.0, 0.2);
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d = seaOctave((uv + (time * seaSpeed)) * freq,choppy);
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d += seaOctave((uv - (time * seaSpeed)) * freq,choppy);
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h += d * amp;
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uv *= octavem; freq *= 1.9; amp *= 0.22;
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choppy = mix(choppy, 1.0, 0.2);
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// }
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return p.z - h;
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}
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vec3 getNormal(vec3 p, float eps) {
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vec3 n;
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n.z = mapDetailed(p);
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n.x = mapDetailed(vec3(p.x + eps, p.y, p.z)) - n.z;
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n.y = mapDetailed(vec3(p.x, p.y + eps, p.z)) - n.z;
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n.z = eps;
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return normalize(n);
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}
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vec3 heightMapTracing(vec3 ori, vec3 dir) {
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vec3 p;
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float tm = 0.0;
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float tx = 1000.0;
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float hx = mapDetailed(ori + dir * tx);
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if(hx > 0.0) return p;
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float hm = mapDetailed(ori + dir * tm);
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float tmid = 0.0;
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for(int i = 0; i < 5; i++) {
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tmid = mix(tm, tx, hm / (hm - hx));
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p = ori + dir * tmid;
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float hmid = mapDetailed(p);
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if (hmid < 0.0) {
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tx = tmid;
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hx = hmid;
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}
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else {
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tm = tmid;
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hm = hmid;
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}
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}
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return p;
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}
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vec3 getSkyColor(vec3 e) {
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e.z = max(e.z, 0.0);
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vec3 ret;
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ret.x = pow(1.0 - e.z, 2.0);
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ret.z = 1.0 - e.z;
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ret.y = 0.6 + (1.0 - e.z) * 0.4;
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return ret;
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}
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float diffuse(vec3 n, vec3 l, float p) {
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return pow(dot(n, l) * 0.4 + 0.6, p);
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}
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float specular(vec3 n, vec3 l, vec3 e, float s) {
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float nrm = (s + 8.0) / (3.1415 * 8.0);
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return pow(max(dot(reflect(e, n), l), 0.0), s) * nrm;
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}
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vec3 getSeaColor(vec3 p, vec3 n, vec3 l, vec3 eye, vec3 dist) {
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float fresnel = 1.0 - max(dot(n, -eye), 0.0);
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fresnel = pow(fresnel, 3.0) * 0.65;
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vec3 reflected = getSkyColor(reflect(eye, n));
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// vec3 reflected = textureLod(senvmapRadiance, envMapEquirect(reflect(eye,n)), 1.0).rgb;
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vec3 refracted = seaBaseColor + diffuse(n, l, 80.0) * seaWaterColor * 0.12;
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vec3 color = mix(refracted, reflected, fresnel);
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float atten = max(1.0 - dot(dist, dist) * 0.001, 0.0);
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color += seaWaterColor * (p.z - seaHeight) * 0.18 * atten;
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color += vec3(specular(n, l, eye, 60.0));
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return color;
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}
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void main() {
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float gdepth = texture(gbufferD, texCoord).r * 2.0 - 1.0;
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// vec4 colorOriginal = vec4(1.0);//texture(tex, texCoord);
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if (gdepth == 1.0) {
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fragColor = vec4(0.0);
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return;
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}
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vec3 color = vec3(1.0);//colorOriginal.rgb;
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vec3 vray = normalize(viewRay);
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vec3 position = getPos(eye, eyeLook, vray, gdepth, cameraProj);
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if (eye.z < seaLevel) {
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// fragColor = colorOriginal;
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fragColor = vec4(0.0);
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return;
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}
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if (position.z > seaLevel + seaMaxAmplitude) {
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// fragColor = colorOriginal;
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fragColor = vec4(0.0);
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return;
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}
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// const vec3 ld = normalize(vec3(0.3, -0.3, 1.0));
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// vec3 lightDir = light - position.xyz;
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vec3 eyeDir = eye - position.xyz;
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// vec3 ld = normalize(lightDir);
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vec3 v = normalize(eyeDir);
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vec3 surfacePoint = heightMapTracing(eye, -v);
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// surfacePoint.z += seaLevel;
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// float depth = length(position - surfacePoint);
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float depthZ = surfacePoint.z - position.z;
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// float dist = length(surfacePoint - eye);
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// float epsx = clamp(dot(dist/2.0,dist/2.0) * 0.001, 0.01, 0.1);
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float dist = max(0.1, length(surfacePoint - eye) * 1.2);
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float epsx = dot(dist, dist) * 0.00005; // Fade in distance to prevent noise
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vec3 normal = getNormal(surfacePoint, epsx);
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// vec3 normal = getNormal(surfacePoint, 0.1);
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// float fresnel = 1.0 - max(dot(normal,-v),0.0);
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// fresnel = pow(fresnel,3.0) * 0.65;
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// vec2 texco = texCoord.xy;
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// texco.x += sin((time) * 0.002 + 3.0 * abs(position.z)) * (refractionScale * min(depthZ, 1.0));
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// vec3 refraction = texture(tex, texco).rgb;
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// vec3 _p = getPos(eye, eyeLook, vray, 1.0 - texture(gbuffer0, texco).a, cameraProj);
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// if (_p.z > seaLevel) {
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// refraction = colorOriginal.rgb;
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// }
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// vec3 reflect = textureLod(senvmapRadiance, envMapEquirect(reflect(v,normal)), 2.0).rgb;
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// vec3 depthN = vec3(depth * fadeSpeed);
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// vec3 waterCol = vec3(clamp(length(sunColor) / 3.0, 0.0, 1.0));
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// refraction = mix(mix(refraction, depthColour * waterCol, clamp(depthN / visibility, 0.0, 1.0)), bigDepthColour * waterCol, clamp(depthZ / extinction, 0.0, 1.0));
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// float foam = 0.0;
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// // texco = (surfacePoint.xy + v.xy * 0.1) * 0.05 + (time) * 0.00001 * wind + sin((time) * 0.001 + position.x) * 0.005;
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// // vec2 texco2 = (surfacePoint.xy + v.xy * 0.1) * 0.05 + (time) * 0.00002 * wind + sin((time) * 0.001 + position.y) * 0.005;
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// // if (depthZ < foamExistence.x) {
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// // foam = (texture(fmap, texco).r + texture(fmap, texco2).r) * 0.5;
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// // }
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// // else if (depthZ < foamExistence.y) {
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// // foam = mix((texture(fmap, texco).r + texture(fmap, texco2).r) * 0.5, 0.0,
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// // (depthZ - foamExistence.x) / (foamExistence.y - foamExistence.x));
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// // }
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// // if (seaMaxAmplitude - foamExistence.z > 0.0001) {
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// // foam += (texture(fmap, texco).r + texture(fmap, texco2).r) * 0.5 *
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// // clamp((seaLevel - (seaLevel + foamExistence.z)) / (seaMaxAmplitude - foamExistence.z), 0.0, 1.0);
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// // }
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// vec3 mirrorEye = (2.0 * dot(v, normal) * normal - v);
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// float dotSpec = clamp(dot(mirrorEye.xyz, -lightDir) * 0.5 + 0.5, 0.0, 1.0);
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// vec3 specular = (1.0 - fresnel) * clamp(-lightDir.z, 0.0, 1.0) * ((pow(dotSpec, 512.0)) * (shininess * 1.8 + 0.2))* sunColor;
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// specular += specular * 25 * clamp(shininess - 0.05, 0.0, 1.0) * sunColor;
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// color = mix(refraction, reflect, fresnel);
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// color = clamp(color + max(specular, foam * sunColor), 0.0, 1.0);
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// color = mix(refraction, color, clamp(depth * shoreHardness, 0.0, 1.0));
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color = getSeaColor(surfacePoint, normal, ld, -v, surfacePoint - eye) * max(0.5, (envmapStrength + 0.2) * 1.4);
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// color = pow(color, vec3(2.2));
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// color = mix(colorOriginal.rgb, color, clamp(depthZ * seaFade, 0.0, 1.0));
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// Fade on horizon
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vec3 vecn = normalize(vecnormal);
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color = mix(color, vec3(1.0), clamp((vecn.z + 0.03) * 10.0, 0.0, 1.0));
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fragColor.rgb = color;
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fragColor.a = clamp(depthZ * seaFade, 0.0, 1.0);
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}
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