Added some more example shaders

2026-02-04 19:29:12 +01:00
parent 59d282b3cc
commit 41b04481aa
6 changed files with 296 additions and 35 deletions
--- a/shaders/cineshader_lava.frag
+++ b/shaders/cineshader_lava.frag
@@ -0,0 +1,92 @@
+/* Based on shader by edankwan: https://www.shadertoy.com/view/3sySRK
+ * CC BY-NC-SA 3.0 - https://creativecommons.org/licenses/by-nc-sa/3.0/
+ * Modified by m11
+ */
+
+float opSmoothUnion( float d1, float d2, float k )
+{
+    float h = clamp( 0.5 + 0.5*(d2-d1)/k, 0.0, 1.0 );
+    return mix( d2, d1, h ) - k*h*(1.0-h);
+}
+
+float sdSphere( vec3 p, float s )
+{
+    return length(p)-s;
+}
+
+float map(vec3 p)
+{
+    float aspect = iResolution.x / iResolution.y;
+    vec2 worldSize = vec2(6.0 * aspect, 6.0);
+    vec3 motionExtent = vec3(worldSize * 0.5 - 1.5, 0.2);
+
+    float d = 10.0;
+    for (int i = 0; i < 16; i++) {
+        float fi = float(i);
+        float time = iTime * (fract(fi * 412.531 + 0.513) - 0.5) * 2.0;
+        d = opSmoothUnion(
+            sdSphere(p + sin(time + fi * vec3(52.5126, 64.62744, 632.25)) * motionExtent, mix(0.7, 1.4, fract(fi * 412.531 + 0.5124))),
+                          d,
+                          0.3
+        );
+    }
+    return d;
+}
+
+vec3 calcNormal( in vec3 p )
+{
+    const float h = 1e-5; // or some other value
+    const vec2 k = vec2(1,-1);
+    return normalize( k.xyy*map( p + k.xyy*h ) +
+    k.yyx*map( p + k.yyx*h ) +
+    k.yxy*map( p + k.yxy*h ) +
+    k.xxx*map( p + k.xxx*h ) );
+}
+
+void mainImage( out vec4 fragColor, in vec2 fragCoord )
+{
+    vec2 uv = fragCoord/iResolution.xy;
+
+    float aspect = iResolution.x / iResolution.y;
+    vec2 worldSize = vec2(6.0 * aspect, 6.0);
+
+    float pixelSize = worldSize.y / iResolution.y;
+
+    // screen size is...
+    vec3 rayOri = vec3((uv - 0.5) * worldSize, 3.0);
+    vec3 rayDir = vec3(0.0, 0.0, -1.0);
+
+    float depth = 0.0;
+    float dist = 0.0;
+    vec3 p;
+
+    for(int i = 0; i < 64; i++) {
+        p = rayOri + rayDir * depth;
+        dist = map(p);
+        depth += dist;
+        if (dist < 1e-6) {
+            break;
+        }
+    }
+
+    depth = min(6.0, depth);
+    vec3 n = calcNormal(p);
+    float b = max(0.0, dot(n, vec3(0.577)));
+    vec3 col = (0.5 + 0.5 * cos((b + iTime * 3.0) + uv.xyx * 2.0 + vec3(0,2,4))) * (0.85 + b * 0.35);
+    col *= exp( -depth * 0.15 );
+
+    float hit = step(dist, 1e-6);
+    float aa = hit * smoothstep(pixelSize, 0.0, dist);
+    fragColor = vec4(col, aa);
+
+    // maximum thickness is 2m in alpha channel
+    //fragColor = vec4(col, 1.0 - (depth - 0.5) / 2.0);
+}
+
+/** SHADERDATA
+ * { *
+ * "title": "My Shader 0",
+ * "description": "Lorem ipsum dolor",
+ * "model": "person"
+ * }
+ */