noise: add image noise test tool

Makefile.am

@@ -248,10 +248,11 @@ AM_DEFAULT_SOURCE_EXT = .cpp
 AM_LDFLAGS  = $(BOOST_LDFLAGS)
 
 bin_PROGRAMS = 				\
-    tools/hash				\
     tools/json-clean			\
     tools/json-validate			\
-    tools/json-schema
+    tools/json-schema			\
+    tools/hash				\
+    tools/noise
 
 LDADD = $(top_builddir)/libutil.a $(BOOST_FILESYSTEM_LIB) $(BOOST_SYSTEM_LIB) $(ZLIB_LIBS)
 

image.cpp

@@ -419,5 +419,8 @@ util::ppm::write (const uint8_t *restrict pixels,
 
 //-----------------------------------------------------------------------------
 template struct util::image::buffer<uint8_t>;
+template struct util::image::buffer<float>;
+
 template util::image::buffer<uint8_t> util::image::buffer<uint8_t>::alloc (void) const;
 template util::image::buffer<uint8_t> util::image::buffer<uint8_t>::clone (void) const;
+template util::image::buffer<uint8_t> util::image::buffer<float>::clone (void) const;

tools/noise.cpp

@@ -0,0 +1,20 @@
+#include "image.hpp"
+#include "noise.hpp"
+#include "lerp.hpp"
+    
+int
+main (void)
+{
+    util::image::buffer<float> img (1920, 1080);
+
+    //static constexpr auto lerp_t = lerp::cubic;
+    //using basis_t = util::noise::gradient<lerp_t>;
+    //using noise_t = util::noise::fbm<basis_t>;
+
+    using noise_t = util::noise::fbm<util::noise::gradient<lerp::quintic>>;
+
+    util::noise::fill (img, noise_t {});
+    
+    auto grey = img.clone<uint8_t> ();
+    util::pgm::write (grey, "noise.ppm");
+}