Move everything into a separate futatabi/ subdir, for the upcoming merge with Nageru.

[nageru] / futatabi / vis.cpp

diff --git a/futatabi/vis.cpp b/futatabi/vis.cpp
new file mode 100644 (file)
index 0000000..c67a0cc
--- /dev/null
+++ b/futatabi/vis.cpp
@@ -0,0 +1,35 @@
+// Visualize a .flo file.
+
+#include "util.h"
+
+#include <assert.h>
+#include <memory>
+#include <stdio.h>
+
+using namespace std;
+
+int main(int argc, char **argv)
+{
+       if (argc != 3) {
+               fprintf(stderr, "Usage: ./vis input.flo out.ppm\n");
+               exit(1);
+       }
+
+       Flow flow = read_flow(argv[1]);
+
+       FILE *fp = fopen(argv[2], "wb");
+       fprintf(fp, "P6\n%d %d\n255\n", flow.width, flow.height);
+       for (unsigned y = 0; y < unsigned(flow.height); ++y) {
+               for (unsigned x = 0; x < unsigned(flow.width); ++x) {
+                       float du = flow.flow[y * flow.width + x].du;
+                       float dv = flow.flow[y * flow.width + x].dv;
+
+                       uint8_t r, g, b;
+                       flow2rgb(du, dv, &r, &g, &b);
+                       putc(r, fp);
+                       putc(g, fp);
+                       putc(b, fp);
+               }
+       }
+       fclose(fp);
+}