Annotations

shaders/balatro-swirl/shader.slang

@@ -6,6 +6,8 @@ float4 balatroSwirl(float2 screenSize, float2 screenCoords, float time, float se
 	float2 uv = (screenCoords - 0.5 * screenSize) / safeScreenLength - offset - seedOffset;
 	float uvLength = length(uv);
 
+	// First warp: convert to polar space and twist the angle more near the
+	// center, creating the large spiral motion.
 	float speed = spinRotation * spinEase * 0.2;
 	if (isRotate)
 		speed = time * speed;
@@ -19,6 +21,8 @@ float4 balatroSwirl(float2 screenSize, float2 screenCoords, float time, float se
 	speed = (time + seed * 17.0) * spinSpeed;
 	float2 uv2 = float2(uv.x + uv.y, uv.x + uv.y);
 
+	// Second warp: a short iterative feedback loop turns the spiral into
+	// painterly bands while preserving a fixed compile-time loop bound.
 	for (int i = 0; i < 5; ++i)
 	{
 		uv2 += float2(sin(max(uv.x, uv.y)), sin(max(uv.x, uv.y))) + uv;
@@ -32,6 +36,8 @@ float4 balatroSwirl(float2 screenSize, float2 screenCoords, float time, float se
 	float c1p = max(0.0, 1.0 - contrastMod * abs(1.0 - paintRes));
 	float c2p = max(0.0, 1.0 - contrastMod * abs(paintRes));
 	float c3p = 1.0 - min(1.0, c1p + c2p);
+	// Three soft band weights drive the palette; lighting rides on the brightest
+	// bands so the swirl keeps dimensional highlights.
 	float light = (lighting - 0.2) * max(c1p * 5.0 - 4.0, 0.0) + lighting * max(c2p * 5.0 - 4.0, 0.0);
 
 	float safeContrast = max(contrast, 0.001);