Merge branch 'main' of http://gitea.xn--jrvisalo-0za.fi/markus/4k_synthwave

src/shaders/fragment.frag

@@ -13,19 +13,10 @@ vec3 palette(float t, float arg, float arg2){
   vec3 a=vec3(0.52,0.56,0.47);
   vec3 b=vec3(0.62,0.56,0.51);
   vec3 c=vec3(0.43,0.79,0.42);
-  vec3 d=vec3(arg,0.42,arg2); // t<>st<73> viimenen floatti siirrett<74>v<EFBFBD> 0, kun tehd<68><64>n paletti switch
+  vec3 d=vec3(arg,0.42,arg2);
   return a+b*cos(6.28318*(c*t+d));
 }
 
-/*
-vec3 palette(float t){
-  vec3 a=vec3(0.52,0.56,0.47);
-  vec3 b=vec3(0.62,0.56,0.51);
-  vec3 c=vec3(0.43,0.79,0.42);
-  vec3 d=vec3(0,0.42,0.63);
-  return a+b*cos(6.28318*(c*t+d));
-}
-*/
 vec2 getUV() {
     const vec2 scale = vec2(0.00104166667, 0.00185185185);
     return gl_FragCoord.xy * scale - 1.0;
@@ -116,41 +107,12 @@ vec2 opU(vec2 d1, vec2 d2) {
     return (d1.x < d2.x) ? d1 : d2;
 }
 
-#define PI 3.14159265
-#define TAU 6.2831853
-#define HEX_SIZE 1.0
-#define PYLON_HEIGHT 4.0
-
-// Rotate 2D vector
-vec2 rotate(vec2 p, float a) {
-    float s = sin(a), c = cos(a);
-    return vec2(c*p.x - s*p.y, s*p.x + c*p.y);
-}
-
-// Hexagonal tiling
-vec2 hex(vec2 p) {
-    vec2 q = vec2(
-        p.x * 2.0 / 3.0,
-        (-p.x + sqrt(3.0) * p.y) / 3.0
-    );
-    return q;
-}
-
-// Signed distance function for pylon
-float pylon(vec3 p) {
-    float radius = 0.5;
-    float d = length(p.xz) - radius;
-    d = max(d, -p.y);
-    d = max(d, p.y - PYLON_HEIGHT);
-    return d;
+float sdSphere(vec3 p, float r){
+    return length(p) -r;
 }
 
 // Scene mapping with occlusion-aware SDF blending
 vec2 mapScene(vec3 p) {
-    
-    //vec2 h = hex(p.xz / HEX_SIZE);
-    //vec2 id = floor(h);
-    //vec2 f = fract(h);
     float dist = 20.;
     int repeat = 0;
     if((length(p.xz)) < 2*dist){
@@ -163,7 +125,6 @@ vec2 mapScene(vec3 p) {
     repeat = 5;
     }
 
-    //int repeat = 2;
     // mitigate neighbor occlusion with anti-bleed blending
     float minDist = 1e9;
     for (int dx = -repeat; dx <= repeat; ++dx) {
@@ -187,35 +148,6 @@ vec2 mapScene(vec3 p) {
     return vec2(minDist,0.);
 }
 
-
-//vec2 mapScene(in vec3 p) {
-//
-//    float res = p.y;
-//    float mat = 0.;
-//
-//    float hexRadius = 0.83;
-//    vec3 hexpos = vec3(p.x, p.y - 2.5, p.z);
-//    HexData hex = hexTile(hexpos, 1.1);
-//
-//    float distFromCenter = hexDistance(hex.axial);
-//    int fftIndex = int(cl(distFromCenter + 1.0, 0.0, 511.0));
-//    float fftVal = fft_output[fftIndex];
-//    float noise = mix(noise(hex.axial+1., 0.1), noise(hex.axial+1., 0.2), sin(syncs[0] * 4.));
-//    float hexHeight = clamp(1.0 + fftVal * 5.0 + noise, 0., 15.);;
-//
-//    // Rotate individual hex tiles if needed
-//    vec3 r = hex.local;
-//   // r.yz *= rot2D(PI * 0.5);
-//    r.xz *= rot2D(0.5);
-//
-//    //float d1 = hexPylon(vec3(r.x, (r.y + hexHeight / 2), r.z), vec2(hexRadius, hexHeight / 2));
-//    float d1 = hexPylon(vec3(r.x, r.y, r.z), vec2(hexRadius, hexHeight));
-//
-//    res = (d1 < res) ? d1 : res;
-//
-//    return vec2(res, mat);
-//}
-
 ////////////////
 //   RAYCAST  //
 ////////////////
@@ -263,55 +195,54 @@ vec3 castRay(vec3 ro, vec3 rd, inout vec3 pos) {
     return vec3(t, mat, hit);
 }
 
-//vec3 castRay(vec3 ro, vec3 rd, inout vec3 pos) {
-//    float mat = 0.;
-//    float hit = 0.;
-//    float t = 0.;
-//    vec2 res;
-//
-//    // Raymarching
-//    for(int i = 0; i < 50; i++) {
-//        pos = ro + rd * t;
-//        res = mapScene(pos); // Get distance to objects, x = dist, y = material
-//        mat = res.y;
-//        t += res.x; // "march" the ray
-//
-//       // if(abs(t) < tolerance * (t * 0.0125 + 1.0)) {
-//        if(abs(res.x) < 0.001) {
-//            hit = 1.;
-//            break;
-//        }
-//        if(t > 300)
-//            break;
-//
-//    }
-//
-//    return vec3(t, mat, hit);
-//}
-
 ////////////////
 //   SHADING  //
 ////////////////
-vec3 phongLighting(vec3 p, vec3 normal, vec3 lightPos, vec3 viewPos, vec3 lightColor, vec3 objectColor) {
-    vec3 lightDir = normalize(lightPos - p);
-    vec3 viewDir = normalize(viewPos - p);
-    vec3 reflectDir = reflect(-lightDir, normal);
+float softshadow(in vec3 ro, in vec3 rd, float mint, float maxt, float w) {
+    float res = 1.0;
+    float t = mint;
+    for(int i = 0; i < 6; i++) {
+        if(t > maxt)
+            break;
+        float h = mapScene(ro + t * rd).x;
+        res = min(res, h / (w * t));
+        t += clamp(h, 0.1, 0.80);
+        if(res < -1.0)
+            break;
+    }
+    res = max(res, -1.0);
+    return 0.25 * (1.0 + res) * (1.0 + res) * (2.0 - res);
+}
 
-    // Ambient
-    float ambientStrength = 0.1;
-    vec3 ambient = ambientStrength * lightColor;
+vec3 addPointLight(vec3 lightPos, vec3 lightColor, float intensity, vec3 worldPos, vec3 viewDir, vec3 normal) {
+    // Light vector from surface to light
+    float roughness = 1.0;
+    vec3 lightDir = lightPos - worldPos;
+    float lightDistance = length(lightDir);
+    lightDir = normalize(lightDir);
 
-    // Diffuse
-    float diff = max(dot(normal, lightDir), 0.0);
-    vec3 diffuse = diff * lightColor;
+    // Attenuation (quadratic falloff)
+    float attenuation = intensity / (1.0 + 0.09 * lightDistance + 0.032 * lightDistance * lightDistance);
 
-    // Specular
-    float specularStrength = 13.5;
-    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32.0); // shininess
-    vec3 specular = specularStrength * spec * lightColor;
+    // Diffuse lighting (Lambert)
+    float NdotL = max(dot(normal, lightDir), 0.0);
+    vec3 diffuse = lightColor * NdotL * attenuation;
 
-    // Combine
-    return (ambient + diffuse + specular) * objectColor;
+    // Specular lighting (Blinn-Phong)
+    vec3 halfDir = normalize(lightDir + (-viewDir));
+    float NdotH = max(dot(normal, halfDir), 0.0);
+    float shininess = mix(128.0, 8.0, roughness); // Convert roughness to shininess
+    vec3 specular = lightColor * pow(NdotH, shininess) * attenuation;
+
+    // Fresnel effect
+    vec3 F0 = vec3(0.04); // Base reflectance for dielectrics
+    vec3 fresnel = F0 + (1.0 - F0) * pow(clamp(1.0 - max(dot(halfDir, lightDir), 0.0), 0.0, 1.0), 5.0);
+
+    // Soft shadows
+    float shadow = softshadow(worldPos + normal * 0.01, lightDir, 0.02, lightDistance, 4.0);
+
+    // Combine diffuse and specular with shadow
+    return (diffuse + specular * fresnel) * shadow * shadow;
 }
 
 vec3 calcNormal(vec3 pos) {
@@ -351,7 +282,29 @@ vec3 shading(vec3 p, vec3 n, vec3 dir, vec3 camPos) {
 
     vec3 lights = vec3(0.);
     //lights += phongLighting(p, n, camPos, dir, vec3(0.51), outMaterial);
-    lights += phongLighting(p, n, vec3(4., 4., -4.), dir, vec3(2.51), outMaterial);
+    lights += addPointLight(vec3(0., 20.0, 0.), vec3(0.77, 0.26, 0.73), 30.0, p, dir, n);
+
+    // LIGHT CHANGING WITH CIRCLE RADIUS
+    float maxRadius = 25.;     // Circle radius
+    float particleHeight = 15.; //(syncs[5] * 40.);
+    float particlePos = (syncs[0] * 0.5) + syncs[5];
+    
+    // Map param to angle
+    float particleStartPos = particlePos * 2.0 * PI;
+         
+    // Direction from center to initial circle position (in XY plane)
+    vec3 particleDir = normalize(vec3(cos(particleStartPos), 0.0, sin(particleStartPos))); // XZ direction
+
+    float r = max(maxRadius - 0.0, maxRadius);
+
+    vec3 particleOffset = vec3(0. , particleHeight, 0.); // particle offset
+
+    // Final object position = center (offset) + radial movement
+    vec3 center = particleOffset;           // Circle center
+    vec3 objPos = center + particleDir * r;         // Object slides inward
+    //res = opU(res, vec2(sdSphere(p - objPos, sphereRadius), 1.));
+
+    lights += addPointLight(objPos, vec3(0.33, 0.91, 0.93), 30.0, p, dir, n);
 
     vec3 lightDir = vec3(0., 2., 3);