setup examples and clean codebase

example/riemman.c

@@ -0,0 +1,50 @@
+#include <complex.h>
+#include <math.h>
+#include <stdio.h>
+
+#define KLEIN_IMPLEMENT
+#include <klein/klein.h>
+#include <klein/norm.h>
+#include <klein/parm.h>
+
+#ifndef CMPLX
+#define CMPLX(a, b) (a + I * b)
+#endif
+
+complex float f(complex float z) { return csqrt(z); }
+
+void riemman(float *d_surface, int *coords, unsigned char *grid)
+{
+	complex float eq;
+	float u = 2 * ((float)coords[0] / grid[0]) - 1;
+	float v = 2 * ((float)coords[1] / grid[1]) - 1;
+
+	eq = f(CMPLX(u, v));
+
+	d_surface[0] = u;
+	d_surface[1] = v;
+	d_surface[2] = creal(eq);
+	d_surface[3] = cimag(eq);
+}
+
+int main(void)
+{
+	const char *file_name = "riemman.klein";
+	struct klein klein;
+	struct parm parametrization = {
+		.grid = (unsigned char[]){16, 4},
+		.m = 2,
+		.n = 4,
+		.f = riemman,
+	};
+
+	printf("writing %s\n", file_name);
+
+	klein_parametrize(&klein, parametrization);
+	klein_normalize(&klein);
+	klein_export_file(klein, file_name);
+
+	free(klein.vertex);
+	free(klein.normals);
+	return 0;
+}