init

ghostty-shaders/cineShader-Lava.glsl

@@ -0,0 +1,76 @@
+// INFO: This shader is a port of https://www.shadertoy.com/view/3sySRK
+
+// INFO: Change these variables to create some variation in the animation
+#define BLACK_BLEND_THRESHOLD .4 // This is controls the dim of the screen
+#define COLOR_SPEED 0.1          // This controls the speed at which the colors change
+#define MOVEMENT_SPEED 0.1       // This controls the speed at which the balls move
+
+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 d = 2.0;
+    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 * MOVEMENT_SPEED + fi * vec3(52.5126, 64.62744, 632.25)) * vec3(2.0, 2.0, 0.8), mix(0.5, 1.0, fract(fi * 412.531 + 0.5124))),
+                d,
+                0.4
+            );
+    }
+    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;
+
+    vec3 rayOri = vec3((uv - 0.5) * vec2(iResolution.x / iResolution.y, 1.0) * 6.0, 3.0);
+    vec3 rayDir = vec3(0.0, 0.0, -1.0);
+
+    float depth = 0.0;
+    vec3 p;
+
+    for (int i = 0; i < 64; i++) {
+        p = rayOri + rayDir * depth;
+        float 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 * COLOR_SPEED * 3.0) + uv.xyx * 2.0 + vec3(0, 2, 4))) * (0.85 + b * 0.35);
+    col *= exp(-depth * 0.15);
+
+    vec2 termUV = fragCoord.xy / iResolution.xy;
+    vec4 terminalColor = texture(iChannel0, termUV);
+
+    float alpha = step(length(terminalColor.rgb), BLACK_BLEND_THRESHOLD);
+    vec3 blendedColor = mix(terminalColor.rgb * 1.0, col.rgb * 0.3, alpha);
+
+    fragColor = vec4(blendedColor, terminalColor.a);
+}