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blight-assets/src/main/resources/Shaders/FlowingWater.frag

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+#ifdef HAS_NORMALMAP
+uniform sampler2D m_NormalMap;
+#endif
+#ifdef HAS_FOAMMAP
+uniform sampler2D m_FoamMap;
+#endif
+
+uniform vec4  m_Tint;
+uniform float m_FoamAmount;
+
+in vec2 vUV;
+in vec2 vTex1;
+in vec2 vTex2;
+
+out vec4 outFragColor;
+
+void main() {
+    // ── Randabstand: 0 = Mitte, 1 = Rand ─────────────────────────────────────
+    float edgeDist = abs(vUV.x * 2.0 - 1.0);
+
+    // ── Tiefengradient ────────────────────────────────────────────────────────
+    // Ränder heller/transparenter (flaches Ufer), Mitte dunkler (tief)
+    vec3  baseColor = m_Tint.rgb * (1.0 - edgeDist * 0.45);
+    float baseAlpha = m_Tint.a * smoothstep(0.0, 0.18, 1.0 - edgeDist);
+
+    // ── Dual-Layer Normal-Map: Specular + Wellenhelligkeit ────────────────────
+    float specular = 0.0;
+    float ripple   = 0.0;
+#ifdef HAS_NORMALMAP
+    vec3 n1 = texture(m_NormalMap, vTex1).rgb * 2.0 - 1.0;
+    vec3 n2 = texture(m_NormalMap, vTex2).rgb * 2.0 - 1.0;
+    vec3 n  = normalize(n1 + n2);
+
+    // Feste Sonnenrichtung – gut für Bachlauf-Optik
+    vec3 sunDir = normalize(vec3(0.5, 1.0, 0.3));
+    specular = pow(max(0.0, dot(n, sunDir)), 22.0);
+    // Wellenhelligkeit variiert den Basiston leicht
+    ripple = dot(n, vec3(0.0, 1.0, 0.0)) * 0.10;
+#endif
+
+    // ── Schaum ────────────────────────────────────────────────────────────────
+    // Uferschaum wird stärker je näher am Rand; Wasserfälle extra
+    float foamEdge = smoothstep(0.55, 1.0, edgeDist);
+    float foamMask = clamp(foamEdge + m_FoamAmount * 0.75, 0.0, 1.0);
+
+#ifdef HAS_FOAMMAP
+    float foamSample = texture(m_FoamMap, vTex1 * 0.4).r;
+    foamMask *= foamSample;
+#else
+    // Prozeduraler Fallback wenn keine Schaumtextur geladen
+    float procFoam = (sin(vTex1.x * 6.283) * 0.5 + 0.5)
+                   * (sin(vTex1.y * 3.141) * 0.5 + 0.5);
+    foamMask *= procFoam;
+#endif
+
+    // ── Zusammenführen ────────────────────────────────────────────────────────
+    vec3  waterColor = baseColor + ripple + vec3(0.35, 0.45, 0.55) * specular;
+    vec3  finalColor = mix(waterColor, vec3(1.0), foamMask);
+    float finalAlpha = max(baseAlpha, foamMask * 0.9);
+
+    outFragColor = vec4(clamp(finalColor, 0.0, 1.0), finalAlpha);
+}