first commit

shaderpacks/Reimagined - Low/shaders/lib/materials/materialMethods/refraction.glsl

@@ -0,0 +1,43 @@
+float GetApproxDistance(float depth) {
+    return near * far / (far - depth * far);
+}
+
+vec2 DoRefraction(inout vec3 color, inout float z0, inout float z1, vec3 viewPos, float lViewPos) {
+    // Prep
+    if (int(texelFetch(colortex6, texelCoord, 0).g * 255.1) != 241) return texCoord.xy;
+
+    float fovScale = gbufferProjection[1][1];
+
+    vec3 playerPos = ViewToPlayer(viewPos.xyz);
+    vec3 worldPos = playerPos.xyz + cameraPosition.xyz;
+    vec2 worldPosRM = worldPos.xz * 0.02 + worldPos.y * 0.01 + 0.01 * frameTimeCounter;
+
+    vec2 refractNoise = texture2DLod(noisetex, worldPosRM, 0.0).rb - vec2(0.5);
+         refractNoise *= WATER_REFRACTION_INTENSITY * fovScale / (3.0 + lViewPos);
+
+    #if WATER_STYLE < 3
+        refractNoise *= 0.015;
+    #else
+        refractNoise *= 0.02;
+    #endif
+
+    // Check
+    float approxDif = GetApproxDistance(z1) - GetApproxDistance(z0);
+    refractNoise *= clamp(approxDif, 0.0, 1.0);
+
+    vec2 refractCoord = texCoord.xy + refractNoise;
+
+    if (int(texture2D(colortex6, refractCoord).g * 255.1) != 241) return texCoord.xy;
+
+    float z0check = texture2D(depthtex0, refractCoord).r;
+    float z1check = texture2D(depthtex1, refractCoord).r;
+    float approxDifCheck = GetApproxDistance(z1check) - GetApproxDistance(z0check);
+    refractNoise *= clamp(approxDifCheck, 0.0, 1.0);
+
+    // Sample
+    refractCoord = texCoord.xy + refractNoise;
+    color = texture2D(colortex0, refractCoord).rgb;
+    z0 = texture2D(depthtex0, refractCoord).r;
+    z1 = texture2D(depthtex1, refractCoord).r;
+    return refractCoord;
+}