From dcd162aef328cde66082a3333740ec6f58298a4c Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sun, 27 Oct 2019 19:40:56 +0100
Subject: Add bounce back boundary condition

---
 .../kernel/template/bounce_back_boundary.cl.mako   | 31 +++++++++++++++++++++
 .../kernel/template/bounce_back_boundary.cpp.mako  | 32 ++++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 boltzgen/kernel/template/bounce_back_boundary.cl.mako
 create mode 100644 boltzgen/kernel/template/bounce_back_boundary.cpp.mako

diff --git a/boltzgen/kernel/template/bounce_back_boundary.cl.mako b/boltzgen/kernel/template/bounce_back_boundary.cl.mako
new file mode 100644
index 0000000..7a9bc2f
--- /dev/null
+++ b/boltzgen/kernel/template/bounce_back_boundary.cl.mako
@@ -0,0 +1,31 @@
+__kernel void bounce_back_boundary(__global ${float_type}* f_next,
+                                   __global ${float_type}* f_prev,
+                                   unsigned int gid)
+{
+    __global ${float_type}* preshifted_f_next = f_next + gid;
+    __global ${float_type}* preshifted_f_prev = f_prev + gid;
+
+% for i, c_i in enumerate(descriptor.c):
+    const ${float_type} f_curr_${i} = preshifted_f_prev[${layout.pop_offset(i) + layout.neighbor_offset(-c_i)}];
+% endfor
+
+% for i, expr in enumerate(moments_subexpr):
+    const ${float_type} ${expr[0]} = ${ccode(expr[1])};
+% endfor
+
+% for i, expr in enumerate(moments_assignment):
+    ${float_type} ${ccode(expr)}
+% endfor
+
+% for i, expr in enumerate(collision_subexpr):
+    const ${float_type} ${expr[0]} = ${ccode(expr[1])};
+% endfor
+
+% for i, expr in enumerate(collision_assignment):
+    const ${float_type} ${ccode(expr)}
+% endfor
+
+% for i, c_i in enumerate(descriptor.c):
+    preshifted_f_next[${layout.pop_offset(i)}] = f_next_${descriptor.c.index(-c_i)};
+% endfor
+}
diff --git a/boltzgen/kernel/template/bounce_back_boundary.cpp.mako b/boltzgen/kernel/template/bounce_back_boundary.cpp.mako
new file mode 100644
index 0000000..06dd718
--- /dev/null
+++ b/boltzgen/kernel/template/bounce_back_boundary.cpp.mako
@@ -0,0 +1,32 @@
+void bounce_back_boundary(      ${float_type}* f_next,
+                          const ${float_type}* f_prev,
+                          std::size_t gid)
+{
+          ${float_type}* preshifted_f_next = f_next + gid*${layout.gid_offset()};
+    const ${float_type}* preshifted_f_prev = f_prev + gid*${layout.gid_offset()};
+
+% for i, c_i in enumerate(descriptor.c):
+    const ${float_type} f_curr_${i} = preshifted_f_prev[${layout.pop_offset(i) + layout.neighbor_offset(-c_i)}];
+% endfor
+
+% for i, expr in enumerate(moments_subexpr):
+    const ${float_type} ${expr[0]} = ${ccode(expr[1])};
+% endfor
+
+% for i, expr in enumerate(moments_assignment):
+    ${float_type} ${ccode(expr)}
+% endfor
+
+% for i, expr in enumerate(collision_subexpr):
+    const ${float_type} ${expr[0]} = ${ccode(expr[1])};
+% endfor
+
+% for i, expr in enumerate(collision_assignment):
+    const ${float_type} ${ccode(expr)}
+% endfor
+
+% for i, c_i in enumerate(descriptor.c):
+    preshifted_f_next[${layout.pop_offset(i)}] = f_next_${descriptor.c.index(-c_i)};
+% endfor
+}
+
-- 
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