From 4ec94c97879aafef15f7663135745e4ba61e62cf Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Mon, 17 May 2021 00:15:33 +0200
Subject: Extract first public LiterateLB version

---
 tangle/sampler/shear_layer.h | 67 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 tangle/sampler/shear_layer.h

(limited to 'tangle/sampler/shear_layer.h')

diff --git a/tangle/sampler/shear_layer.h b/tangle/sampler/shear_layer.h
new file mode 100644
index 0000000..0d42ee8
--- /dev/null
+++ b/tangle/sampler/shear_layer.h
@@ -0,0 +1,67 @@
+#pragma once
+
+#include "sampler.h"
+
+#include <LLBM/kernel/collect_moments.h>
+#include <LLBM/kernel/collect_shear_layer_normal.h>
+
+template <typename DESCRIPTOR, typename T, typename S, typename SDF>
+class ShearLayerVisibilityS : public Sampler {
+private:
+Lattice<DESCRIPTOR,T,S>& _lattice;
+DeviceBuffer<bool>& _mask;
+SDF _geometry;
+
+DeviceBuffer<float> _moments_rho;
+DeviceBuffer<float> _moments_u;
+DeviceBuffer<float> _shear_normals;
+
+float3 _shear_layer;
+float _lower = 0;
+float _upper = 1;
+bool _center = true;
+
+public:
+ShearLayerVisibilityS(Lattice<DESCRIPTOR,T,S>& lattice, DeviceBuffer<bool>& mask, SDF geometry, float3 shear_layer):
+  Sampler("Shear layer visibility", lattice.cuboid()),
+  _lattice(lattice),
+  _mask(mask),
+  _geometry(geometry),
+  _moments_rho(lattice.cuboid().volume),
+  _moments_u(DESCRIPTOR::d * lattice.cuboid().volume),
+  _shear_normals(DESCRIPTOR::d * lattice.cuboid().volume),
+  _shear_layer(shear_layer)
+{ }
+
+void sample() {
+  _lattice.template inspect<CollectShearLayerNormalsF>(_mask, _moments_rho.device(), _moments_u.device(), _shear_normals.device());
+  _lattice.template helper<CollectShearLayerVisibilityF>(_mask, _shear_normals.device(), _shear_layer, _sample_surface);
+}
+
+void render(VolumetricRenderConfig& config) {
+  raymarch<<<
+    dim3(config.canvas_size.x / 32 + 1, config.canvas_size.y / 32 + 1),
+    dim3(32, 32)
+  >>>(config,
+      _geometry,
+      [samples=_sample_texture, lower=_lower, upper=_upper, center=_center]
+      __device__ (float3 p) -> float {
+        float sample = tex3D<float>(samples, p.x, p.y, p.z);
+        float centered = center ? 0.5 + 0.5*sample : sample;
+        return fabs(sample) >= lower && fabs(sample) <= upper ? fabs(centered) : 0;
+      },
+      [] __device__ (float x) -> float {
+        return x;
+      });
+}
+
+void interact() {
+  ImGui::InputFloat3("Normal", reinterpret_cast<float*>(&_shear_layer));
+  ImGui::Checkbox("Center", &_center);
+  ImGui::DragFloatRange2("Bounds", &_lower, &_upper, 0.01f, 0.f, 1.f, "%.2f", "%.2f");
+}
+
+};
+
+template <typename DESCRIPTOR, typename T, typename S, typename SDF>
+ShearLayerVisibilityS(Lattice<DESCRIPTOR,T,S>&, DeviceBuffer<bool>&, SDF) -> ShearLayerVisibilityS<DESCRIPTOR,T,S,SDF>;
-- 
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