init

src/spacetime_minkowski.c

@@ -0,0 +1,56 @@
+#include "spacetime.h"
+
+#include <stdlib.h>
+
+typedef struct {
+  double escape_radius;
+} MinkowskiContext;
+
+static int minkowski_eval(const SpacetimeSource *source, double t,
+                          const double x[3], MetricData *metric) {
+  (void)source;
+  (void)t;
+  (void)x;
+  *metric = (MetricData){
+      .alpha = 1.0,
+      .gamma = {{1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}, {0.0, 0.0, 1.0}}};
+  return 0;
+}
+
+static SpacetimeRayStatus minkowski_classify(const SpacetimeSource *source,
+                                             double t, const double x[3]) {
+  const MinkowskiContext *context = source->context;
+  const double radius_squared = x[0] * x[0] + x[1] * x[1] + x[2] * x[2];
+  (void)t;
+  return radius_squared >= context->escape_radius * context->escape_radius
+             ? SPACETIME_RAY_ESCAPED
+             : SPACETIME_RAY_ACTIVE;
+}
+
+static void minkowski_destroy(SpacetimeSource *source) {
+  free(source->context);
+  source->context = NULL;
+  source->ops = NULL;
+}
+
+static const SpacetimeOps minkowski_ops = {
+    .eval = minkowski_eval,
+    .classify = minkowski_classify,
+    .destroy = minkowski_destroy,
+};
+
+int spacetime_create_minkowski(SpacetimeSource *source, double escape_radius) {
+  if (source == NULL || escape_radius <= 0.0)
+    return -1;
+  MinkowskiContext *context = malloc(sizeof *context);
+  if (context == NULL)
+    return -1;
+  context->escape_radius = escape_radius;
+  source->ops = &minkowski_ops;
+  source->context = context;
+  return 0;
+}
+
+int spacetime_create_default(SpacetimeSource *source) {
+  return spacetime_create_minkowski(source, 1024.0);
+}