From 8bc49efb970ac44f17f6076bb16f1d0e712bd750 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Sat, 10 Dec 2022 17:14:50 -0600
Subject: implement node transform processing

---
 src/node.c      |  49 +++++++++++++++++++++++++++
 src/node.h      |   2 +-
 src/node.test.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 153 insertions(+), 1 deletion(-)

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;
+}
diff --git a/src/node.h b/src/node.h
index ea0bedf..7eb75e9 100644
--- a/src/node.h
+++ b/src/node.h
@@ -4,6 +4,6 @@
 #include <kalmia.h>
 #include <ezxml.h>
 
-
+ka_node_t * kai_parse_node(kalmia_t *k, ezxml_t tag);
 
 #endif
diff --git a/src/node.test.c b/src/node.test.c
index 236d200..26837c9 100644
--- a/src/node.test.c
+++ b/src/node.test.c
@@ -1,8 +1,111 @@
+#include <string.h>
+
 #include <kalmia.h>
 #include <ezxml.h>
 #include "test/test.h"
+#include "transform.h"
+#include "node.h"
+
+
+void empty();
+void transforms();
 
 
 void suite_node()
 {
+	lily_run_test(empty);
+	lily_run_test(transforms);
+}
+
+
+void empty()
+{
+	char str[512];
+	strncpy(
+		str,
+		"<node></node>",
+		512
+	);
+	ezxml_t tag = ezxml_parse_str(str, strlen(str));
+
+	kalmia_t k;
+	k.node = NULL;
+	k.n_nodes = 0;
+	k.n_nodes_max = 0;
+
+	ka_node_t *node = kai_parse_node(&k, tag);
+	lily_assert_not_null(k.node);
+	lily_assert_not_null(node);
+	lily_assert_int_equal(k.n_nodes, 1);
+	lily_assert_ptr_equal(k.node, node);
+
+	ka_matrix_t identity;
+	kai_identity(&identity);
+
+	int i=0;
+	for (i=0; i<16; i++) {
+		lily_assert_float_equal(
+			node->transform[i],
+			identity[i],
+			1e-3
+		);
+	}
+
+	ezxml_free(tag);
+	free(k.node);
+}
+
+
+void transforms()
+{
+	char str[512];
+	strncpy(
+		str,
+		"<node>\n"
+		"	<translate>10.0 2.0 5.0</translate>\n"
+		"	<scale>5.0 1.0 2.0</scale>\n"
+		"</node>",
+		512
+	);
+	ezxml_t tag = ezxml_parse_str(str, strlen(str));
+
+	kalmia_t k;
+	k.node = NULL;
+	k.n_nodes = 0;
+	k.n_nodes_max = 0;
+
+	ka_node_t *node = kai_parse_node(&k, tag);
+	lily_assert_not_null(k.node);
+	lily_assert_not_null(node);
+	lily_assert_int_equal(k.n_nodes, 1);
+	lily_assert_ptr_equal(k.node, node);
+
+	ka_matrix_t translate = {
+		1.0f, 0.0f, 0.0f, 10.0f,
+		0.0f, 1.0f, 0.0f,  2.0f,
+		0.0f, 0.0f, 1.0f,  5.0f,
+		0.0f, 0.0f, 0.0f,  1.0f,
+	};
+	ka_matrix_t scale = {
+		5.0f, 0.0f, 0.0f, 0.0f,
+		0.0f, 1.0f, 0.0f, 0.0f,
+		0.0f, 0.0f, 2.0f, 0.0f,
+		0.0f, 0.0f, 0.0f, 1.0f,
+	};
+
+	ka_matrix_t expected;
+	kai_multiply(&expected, translate, scale);
+
+
+	int i=0;
+	for (i=0; i<16; i++) {
+		lily_assert_float_equal(
+			node->transform[i],
+			expected[i],
+			1e-3
+		);
+	}
+
+	ezxml_free(tag);
+	free(k.node);
 }
-- 
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