first commit

ghostty/shaders/cineShader-Lava.glsl

@@ -0,0 +1,79 @@
+// 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);
+
+}
+