From 1a7c31a135ad08781f8e4abdd8dec11c7395bba1 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Wed, 12 Jun 2019 20:25:38 +0200
Subject: Move kernel template into separate file

---
 codegen_lbm.py       | 110 +--------------------------------------------------
 template/kernel.mako | 105 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+), 109 deletions(-)
 create mode 100644 template/kernel.mako

diff --git a/codegen_lbm.py b/codegen_lbm.py
index e1906dc..7940b60 100644
--- a/codegen_lbm.py
+++ b/codegen_lbm.py
@@ -13,114 +13,6 @@ import lbm_d2q9 as D2Q9
 
 from mako.template import Template
 
-kernel = """
-__constant float tau = ${tau};
-
-bool is_in_circle(float x, float y, float a, float b, float r) {
-    return sqrt(pow(x-a,2)+pow(y-b,2)) < r;
-}
-
-__kernel void equilibrilize(__global __write_only float* f_a,
-                            __global __write_only float* f_b)
-{
-    const unsigned int gid = get_global_id(1)*${nX} + get_global_id(0);
-
-    __global __write_only float* preshifted_f_a = f_a + gid;
-    __global __write_only float* preshifted_f_b = f_b + gid;
-
-    if (  is_in_circle(get_global_id(0), get_global_id(1), ${nX//4},    ${nY//4},    ${nX//10})
-       || is_in_circle(get_global_id(0), get_global_id(1), ${nX//4},    ${nY-nY//4}, ${nX//10})
-       || is_in_circle(get_global_id(0), get_global_id(1), ${nX-nX//4}, ${nY//4},    ${nX//10})
-       || is_in_circle(get_global_id(0), get_global_id(1), ${nX-nX//4}, ${nY-nY//4}, ${nX//10}) ) {
-% for i, w_i in enumerate(w):
-        preshifted_f_a[${i*nCells}] = 1./24.f;
-        preshifted_f_b[${i*nCells}] = 1./24.f;
-% endfor
-    } else {
-% for i, w_i in enumerate(w):
-        preshifted_f_a[${i*nCells}] = ${w_i}.f;
-        preshifted_f_b[${i*nCells}] = ${w_i}.f;
-% endfor
-    }
-}
-
-<%
-def direction_index(c_i):
-    return (c_i[0]+1) + 3*(1-c_i[1])
-
-def neighbor_offset(c_i):
-    if c_i[1] == 0:
-        return c_i[0]
-    else:
-        return c_i[1]*nX + c_i[0]
-%>
-
-__kernel void collide_and_stream(__global __write_only float* f_a,
-                                 __global __read_only  float* f_b,
-                                 __global __read_only  int* material)
-{
-    const unsigned int gid = get_global_id(1)*${nX} + get_global_id(0);
-
-    const int m = material[gid];
-
-    if ( m == 0 ) {
-        return;
-    }
-
-    __global __write_only float* preshifted_f_a = f_a + gid;
-    __global __read_only  float* preshifted_f_b = f_b + gid;
-
-% for i, c_i in enumerate(c):
-    const float f_curr_${i} = preshifted_f_b[${direction_index(c_i)*nCells + neighbor_offset(-c_i)}];
-% endfor
-
-% for i, expr in enumerate(moments_helper):
-    const float ${expr[0]} = ${ccode(expr[1])};
-% endfor
-
-% for i, expr in enumerate(moments_assignment):
-    float ${ccode(expr)}
-% endfor
-
-    if ( m == 2 ) {
-        u_0 = 0.0;
-        u_1 = 0.0;
-    }
-
-% for i, expr in enumerate(collide_helper):
-    const float ${expr[0]} = ${ccode(expr[1])};
-% endfor
-
-% for i, expr in enumerate(collide_assignment):
-    const float ${ccode(expr)}
-% endfor
-
-% for i in range(0,len(c)):
-    preshifted_f_a[${i*nCells}] = f_next_${i};
-% endfor
-}
-
-__kernel void collect_moments(__global __read_only  float* f,
-                              __global __write_only float* moments)
-{
-    const unsigned int gid = get_global_id(1)*${nX} + get_global_id(0);
-
-    __global __read_only float* preshifted_f = f + gid;
-
-% for i in range(0,len(c)):
-    const float f_curr_${i} = preshifted_f[${i*nCells}];
-% endfor
-
-% for i, expr in enumerate(moments_helper):
-    const float ${expr[0]} = ${ccode(expr[1])};
-% endfor
-
-% for i, expr in enumerate(moments_assignment):
-    moments[${i*nCells} + gid] = ${ccode(expr.rhs)};
-% endfor
-}"""
-
-
 class D2Q9_BGK_Lattice:
     def idx(self, x, y):
         return y * self.nX + x;
@@ -160,7 +52,7 @@ class D2Q9_BGK_Lattice:
                     self.np_material[self.idx(x,y)] = 1
 
     def build_kernel(self):
-        program_src = Template(kernel).render(
+        program_src = Template(filename = './template/kernel.mako').render(
             nX     = self.nX,
             nY     = self.nY,
             nCells = self.nCells,
diff --git a/template/kernel.mako b/template/kernel.mako
new file mode 100644
index 0000000..c43a0dc
--- /dev/null
+++ b/template/kernel.mako
@@ -0,0 +1,105 @@
+__constant float tau = ${tau};
+
+bool is_in_circle(float x, float y, float a, float b, float r) {
+    return sqrt(pow(x-a,2)+pow(y-b,2)) < r;
+}
+
+__kernel void equilibrilize(__global __write_only float* f_a,
+                            __global __write_only float* f_b)
+{
+    const unsigned int gid = get_global_id(1)*${nX} + get_global_id(0);
+
+    __global __write_only float* preshifted_f_a = f_a + gid;
+    __global __write_only float* preshifted_f_b = f_b + gid;
+
+    if (  is_in_circle(get_global_id(0), get_global_id(1), ${nX//4},    ${nY//4},    ${nX//10})
+       || is_in_circle(get_global_id(0), get_global_id(1), ${nX//4},    ${nY-nY//4}, ${nX//10})
+       || is_in_circle(get_global_id(0), get_global_id(1), ${nX-nX//4}, ${nY//4},    ${nX//10})
+       || is_in_circle(get_global_id(0), get_global_id(1), ${nX-nX//4}, ${nY-nY//4}, ${nX//10}) ) {
+% for i, w_i in enumerate(w):
+        preshifted_f_a[${i*nCells}] = 1./24.f;
+        preshifted_f_b[${i*nCells}] = 1./24.f;
+% endfor
+    } else {
+% for i, w_i in enumerate(w):
+        preshifted_f_a[${i*nCells}] = ${w_i}.f;
+        preshifted_f_b[${i*nCells}] = ${w_i}.f;
+% endfor
+    }
+}
+
+<%
+def direction_index(c_i):
+    return (c_i[0]+1) + 3*(1-c_i[1])
+
+def neighbor_offset(c_i):
+    if c_i[1] == 0:
+        return c_i[0]
+    else:
+        return c_i[1]*nX + c_i[0]
+%>
+
+__kernel void collide_and_stream(__global __write_only float* f_a,
+                                 __global __read_only  float* f_b,
+                                 __global __read_only  int* material)
+{
+    const unsigned int gid = get_global_id(1)*${nX} + get_global_id(0);
+
+    const int m = material[gid];
+
+    if ( m == 0 ) {
+        return;
+    }
+
+    __global __write_only float* preshifted_f_a = f_a + gid;
+    __global __read_only  float* preshifted_f_b = f_b + gid;
+
+% for i, c_i in enumerate(c):
+    const float f_curr_${i} = preshifted_f_b[${direction_index(c_i)*nCells + neighbor_offset(-c_i)}];
+% endfor
+
+% for i, expr in enumerate(moments_helper):
+    const float ${expr[0]} = ${ccode(expr[1])};
+% endfor
+
+% for i, expr in enumerate(moments_assignment):
+    float ${ccode(expr)}
+% endfor
+
+    if ( m == 2 ) {
+        u_0 = 0.0;
+        u_1 = 0.0;
+    }
+
+% for i, expr in enumerate(collide_helper):
+    const float ${expr[0]} = ${ccode(expr[1])};
+% endfor
+
+% for i, expr in enumerate(collide_assignment):
+    const float ${ccode(expr)}
+% endfor
+
+% for i in range(0,len(c)):
+    preshifted_f_a[${i*nCells}] = f_next_${i};
+% endfor
+}
+
+__kernel void collect_moments(__global __read_only  float* f,
+                              __global __write_only float* moments)
+{
+    const unsigned int gid = get_global_id(1)*${nX} + get_global_id(0);
+
+    __global __read_only float* preshifted_f = f + gid;
+
+% for i in range(0,len(c)):
+    const float f_curr_${i} = preshifted_f[${i*nCells}];
+% endfor
+
+% for i, expr in enumerate(moments_helper):
+    const float ${expr[0]} = ${ccode(expr[1])};
+% endfor
+
+% for i, expr in enumerate(moments_assignment):
+    moments[${i*nCells} + gid] = ${ccode(expr.rhs)};
+% endfor
+}
-- 
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