Multi pass test

shaders/multipass-test/shader.slang

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+float ringMask(float2 uv)
+{
+	float2 centered = uv * 2.0 - 1.0;
+	float radius = length(centered);
+	float ring = 1.0 - smoothstep(0.015, 0.035, abs(radius - 0.55));
+	float cross = 1.0 - smoothstep(0.006, 0.018, min(abs(centered.x), abs(centered.y)));
+	return saturate(max(ring, cross));
+}
+
+float gridMask(float2 uv)
+{
+	float2 cell = abs(frac(uv * max(scale, 1.0)) - 0.5);
+	float line = 1.0 - smoothstep(0.455, 0.495, max(cell.x, cell.y));
+	return saturate(line * 0.55);
+}
+
+float4 buildMask(ShaderContext context)
+{
+	float mask = saturate(max(ringMask(context.uv), gridMask(context.uv)));
+	return float4(mask, context.uv.x, context.uv.y, 1.0);
+}
+
+float4 applyMask(ShaderContext context)
+{
+	float4 generated = sampleVideo(context.uv);
+	float mask = generated.r;
+	float2 encodedUv = generated.gb;
+	float checker = step(0.5, frac((encodedUv.x + encodedUv.y) * max(scale, 1.0)));
+	float3 testColor = lerp(float3(0.0, 0.75, 1.0), float3(1.0, 0.1, 0.85), checker);
+	float3 base = context.sourceColor.rgb * 0.35;
+	float3 color = lerp(base, testColor, mask * saturate(intensity));
+	return float4(color, context.sourceColor.a);
+}
+
+float4 shadeVideo(ShaderContext context)
+{
+	return applyMask(context);
+}