commit 0014eb1bad50244314ed09592fe57efa9322678c
Author: Sven Claussner <sclaussner src gnome org>
Date: Thu Jun 19 20:07:33 2014 +0200
Add noise-simplex.cl.h
Add noise-simplex.cl.h to be able to build from a tarball or
without Python and to be consistent with the other OpenCL operations.
opencl/noise-simplex.cl.h | 90 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 90 insertions(+), 0 deletions(-)
---
diff --git a/opencl/noise-simplex.cl.h b/opencl/noise-simplex.cl.h
new file mode 100644
index 0000000..ad7827a
--- /dev/null
+++ b/opencl/noise-simplex.cl.h
@@ -0,0 +1,90 @@
+static const char* noise_simplex_cl_source =
+"#define MAX_RANK 3 \n"
+" \n"
+"float2 \n"
+"philox (uint2 st, \n"
+" uint k) \n"
+"{ \n"
+" ulong p; \n"
+" int i; \n"
+" \n"
+" for (i = 0 ; i < 3 ; i += 1) \n"
+" { \n"
+" p = st.x * 0xcd9e8d57ul; \n"
+" \n"
+" st.x = ((uint)(p >> 32)) ^ st.y ^ k; \n"
+" st.y = (uint)p; \n"
+" \n"
+" k += 0x9e3779b9u; \n"
+" } \n"
+" \n"
+" return convert_float2(st) / 2147483648.0f - 1.0f; \n"
+"} \n"
+" \n"
+"__kernel void kernel_noise (__global float *out, \n"
+" const int x_0, \n"
+" const int y_0, \n"
+" const uint iterations, \n"
+" const float scale, \n"
+" const uint seed) \n"
+"{ \n"
+" const int gidx = get_global_id(0); \n"
+" const int gidy = get_global_id(1); \n"
+" \n"
+" float c, d, m; \n"
+" float2 p; \n"
+" int j; \n"
+" \n"
+" for (j = 0, m = 0, c = 1, d = scale; \n"
+" j < iterations; \n"
+" c *= 2, d *= 2, j += 1) \n"
+" { \n"
+" float s, t, n; \n"
+" float2 g[3], u[3], i, di; \n"
+" int k; \n"
+" \n"
+" p = (float2)(gidx + x_0, gidy + y_0) * d; \n"
+" \n"
+" /* Skew the input point and find the lowest corner of the containing \n"
+" simplex. */ \n"
+" \n"
+" s = (p.x + p.y) * (sqrt(3.0f) - 1) / 2; \n"
+" i = floor(p + s); \n"
+" \n"
+" /* Calculate the (unskewed) distance between the input point and all \n"
+" simplex corners. */ \n"
+" \n"
+" s = (i.x + i.y) * (3 - sqrt(3.0f)) / 6; \n"
+" u[0] = p - i + s; \n"
+" \n"
+" di = u[0].x >= u[0].y ? (float2)(1, 0) : (float2)(0, 1); \n"
+" \n"
+" u[1] = u[0] - di + (3 - sqrt(3.0f)) / 6; \n"
+" u[2] = u[0] - 1 + (3 - sqrt(3.0f)) / 3; \n"
+" \n"
+" /* Calculate gradients for each corner vertex. We convert to \n"
+" * signed int first to avoid implementation-defined behavior for \n"
+" * out-of-range values. See section 6.2.3.3 of the OpenCL \n"
+" * specification. */ \n"
+" \n"
+" g[0] = philox(convert_uint2(convert_int2(i)), seed); \n"
+" g[1] = philox(convert_uint2(convert_int2(i + di)), seed); \n"
+" g[2] = philox(convert_uint2(convert_int2(i + 1)), seed); \n"
+" \n"
+" for (k = 0, n = 0 ; k < 3 ; k += 1) \n"
+" { \n"
+" t = 0.5f - dot(u[k], u[k]); \n"
+" \n"
+" if (t > 0) \n"
+" { \n"
+" t *= t; \n"
+" n += t * t * dot(g[k], u[k]); \n"
+" } \n"
+" } \n"
+" \n"
+" m += 70 * n / c; \n"
+" } \n"
+" \n"
+" out[gidy * get_global_size(0) + gidx] = m; \n"
+"} \n"
+;