implement node transform processing

1 files changed, 49 insertions, 0 deletions

diff --git a/src/node.c b/src/node.c
index 1ba862d..abf0034 100644
--- a/src/node.c
+++ b/src/node.c
@@ -1,5 +1,54 @@
+#include <string.h>
+
 #include <kalmia.h>
 #include <ezxml.h>
+
+#include "util.h"
+#include "transform.h"
 #include "node.h"
 
 
+ka_node_t * kai_parse_node(kalmia_t *k, ezxml_t tag)
+{
+	/* check for incorrect tag name */
+	if (strcmp("node", ezxml_name(tag)) != 0)
+		return NULL;
+	
+	/* initialize node */
+	ka_node_t *node = kai_next_node(k);
+	kai_identity(&(node->transform));
+
+	/* get first child */
+	ezxml_t t = tag->child;
+
+	/* iterate over sub-tags */
+	while (t != NULL) {
+		const char *t_name = ezxml_name(t);
+		ka_matrix_t m;
+		if (strcmp(t_name, "matrix") == 0) {
+			/* process matrix */
+			kai_parse_matrix(&m, t);
+			kai_multiply(&(node->transform), node->transform, m);
+		}
+		else if (strcmp(t_name, "rotate") == 0) {
+			/* process rotation */
+			kai_parse_rotate(&m, t);
+			kai_multiply(&(node->transform), node->transform, m);
+		}
+		else if (strcmp(t_name, "scale") == 0) {
+			/* process scale */
+			kai_parse_scale(&m, t);
+			kai_multiply(&(node->transform), node->transform, m);
+		}
+		else if (strcmp(t_name, "translate") == 0) {
+			/* process translation */
+			kai_parse_translate(&m, t);
+			kai_multiply(&(node->transform), node->transform, m);
+		}
+
+		/* advance to next child node */
+		t = t->ordered;
+	}
+
+	return node;
+}