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/LLBM/kernel/collect_velocity_norm.h | 61 ++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 tangle/LLBM/kernel/collect_velocity_norm.h

(limited to 'tangle/LLBM/kernel/collect_velocity_norm.h')

diff --git a/tangle/LLBM/kernel/collect_velocity_norm.h b/tangle/LLBM/kernel/collect_velocity_norm.h
new file mode 100644
index 0000000..ea099a8
--- /dev/null
+++ b/tangle/LLBM/kernel/collect_velocity_norm.h
@@ -0,0 +1,61 @@
+#pragma once
+#include <LLBM/call_tag.h>
+
+struct CollectVelocityNormF {
+
+using call_tag = tag::post_process_by_spatial_cell_mask;
+
+template <typename T, typename S>
+__device__ static void apply(
+    descriptor::D2Q9
+  , std::size_t gid
+  , std::size_t iX
+  , std::size_t iY
+  , std::size_t iZ
+  , T* u
+  , cudaSurfaceObject_t surface
+) {
+  float norm = length(make_float2(u[2*gid+0], u[2*gid+1]));
+  surf2Dwrite(norm, surface, iX*sizeof(float), iY);
+}
+
+template <typename T, typename S>
+__device__ static void apply(
+    descriptor::D3Q19
+  , std::size_t gid
+  , std::size_t iX
+  , std::size_t iY
+  , std::size_t iZ
+  , T* u
+  , cudaSurfaceObject_t surface
+  , T* u_norm = nullptr
+) {
+  float norm = length(make_float3(u[3*gid+0], u[3*gid+1], u[3*gid+2]));
+  surf3Dwrite(norm, surface, iX*sizeof(float), iY, iZ);
+  if (u_norm != nullptr) {
+    u_norm[gid] = norm;
+  }
+}
+
+};
+
+template <typename SLICE, typename SAMPLE, typename PALETTE>
+__global__ void renderSliceViewToTexture(std::size_t width, std::size_t height, SLICE slice, SAMPLE sample, PALETTE palette, cudaSurfaceObject_t texture) {
+  const int screenX = threadIdx.x + blockIdx.x * blockDim.x;
+  const int screenY = threadIdx.y + blockIdx.y * blockDim.y;
+
+  if (screenX > width-1 || screenY > height-1) {
+    return;
+  }
+  
+  const std::size_t gid = slice(screenX,screenY);
+  float3 color = palette(sample(gid));
+
+  uchar4 pixel {
+    static_cast<unsigned char>(color.x * 255),
+    static_cast<unsigned char>(color.y * 255),
+    static_cast<unsigned char>(color.z * 255),
+    255
+  };
+  surf2Dwrite(pixel, texture, screenX*sizeof(uchar4), screenY);
+}
-- 
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