From ef5142f0d044b3480790606536c492719c6e73ef Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Sat, 4 Feb 2023 12:53:00 -0600
Subject: implement kai_read_accessor()

---
 include/kalmia.h             | 10 ++++++++
 src/geometry/geometry.c      | 32 +++++++++++++++++++++++
 src/geometry/geometry.h      |  1 +
 src/geometry/geometry.test.c | 61 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 104 insertions(+)

diff --git a/include/kalmia.h b/include/kalmia.h
index 615753c..06a555b 100644
--- a/include/kalmia.h
+++ b/include/kalmia.h
@@ -81,5 +81,15 @@ struct ka_param_t {
 	char *semantic;
 };
 
+struct ka_accessor_t {
+	unsigned int count;  /* required */
+	unsigned int offset; /* default 0 */
+	char *source;        /* required */
+	unsigned int stride; /* default 1 */
+
+	unsigned int param_count;
+	struct ka_param_t *param;
+};
+
 
 #endif
diff --git a/src/geometry/geometry.c b/src/geometry/geometry.c
index 6f6cbae..6c84b11 100644
--- a/src/geometry/geometry.c
+++ b/src/geometry/geometry.c
@@ -52,3 +52,35 @@ int kai_read_param(struct ka_param_t *dest, struct kai_tag_t *src)
 
 	return 0;
 }
+
+
+int kai_read_accessor(struct ka_accessor_t *dest, struct kai_tag_t *src)
+{
+	CHECK_TAG_TYPE("accessor");
+
+	long count = kai_tag_attr_to_long(src, "count", -1);
+	if (count == -1) { return -1; }
+	char *source = kai_tag_attr_to_dup(src, "source");
+	if (source == NULL) { return -1; }
+
+	dest->count = count;
+	dest->offset = kai_tag_attr_to_long(src, "offset", 0);
+	dest->source = source;
+	dest->stride = kai_tag_attr_to_long(src, "stride", 1);
+
+	dest->param_count = kai_tag_num_children(src);
+	dest->param = malloc(dest->param_count * sizeof(struct ka_param_t));
+	struct kai_tag_t *t = src->children;
+	int i;
+	for (i=0; i<dest->param_count; i++) {
+		int result = kai_read_param(dest->param + i, t);
+		if (result != 0) {
+			free(dest->param);
+			free(dest->source);
+			return -1;
+		}
+		t = t->next;
+	}
+
+	return 0;
+}
diff --git a/src/geometry/geometry.h b/src/geometry/geometry.h
index acb27ee..daa883d 100644
--- a/src/geometry/geometry.h
+++ b/src/geometry/geometry.h
@@ -6,5 +6,6 @@
 
 int kai_read_float_array(struct ka_float_array_t *dest, struct kai_tag_t *src);
 int kai_read_param(struct ka_param_t *dest, struct kai_tag_t *src);
+int kai_read_accessor(struct ka_accessor_t *dest, struct kai_tag_t *src);
 
 #endif
diff --git a/src/geometry/geometry.test.c b/src/geometry/geometry.test.c
index dec16e9..2c172f2 100644
--- a/src/geometry/geometry.test.c
+++ b/src/geometry/geometry.test.c
@@ -117,5 +117,66 @@ LILY_TEST("read param tag")
 #include LILY_PUSH_TEST()
 
 
+LILY_TEST("fail to read non-accessor tag")
+{
+	struct kai_tag_t *t = kai_parse_string(
+		"<tag />"
+	);
+
+	struct ka_accessor_t accessor;
+	int result = kai_read_accessor(&accessor, t);
+	CHECK_EQ(result, -1, "%d");
+
+	kai_tag_destroy(t);
+}
+#include LILY_PUSH_TEST()
+
+
+LILY_TEST("fail to read accessor tag with no specified count or source")
+{
+	struct kai_tag_t *t = kai_parse_string(
+		"<accessor />"
+	);
+
+	struct ka_accessor_t accessor;
+	int result = kai_read_accessor(&accessor, t);
+	CHECK_EQ(result, -1, "%d");
+
+	kai_tag_destroy(t);
+}
+#include LILY_PUSH_TEST()
+
+
+LILY_TEST("parse accessor")
+{
+	struct kai_tag_t *t = kai_parse_string(
+		"<accessor source=\"some id\" count=\"6\" stride=\"3\">"
+		"	<param type=\"float\" name=\"x\" />"
+		"	<param type=\"float\" name=\"y\" />"
+		"	<param type=\"float\" name=\"z\" />"
+		"</accessor>"
+	);
+
+	struct ka_accessor_t acc;
+	int result = kai_read_accessor(&acc, t);
+	kai_tag_destroy(t);
+
+	CHECK_EQ(result, 0, "%d");
+	CHECK_EQ(acc.count, 6, "%d");
+	CHECK_EQ(acc.offset, 0, "%d");
+	CHECK_EQS(acc.source, "some id");
+	CHECK_EQ(acc.stride, 3, "%d");
+
+	REQUIRE_EQ(acc.param_count, 3, "%d");
+	CHECK_EQS(acc.param[0].name, "x");
+	CHECK_EQS(acc.param[1].name, "y");
+	CHECK_EQS(acc.param[2].name, "z");
+
+	free(acc.source);
+	for (int i=0; i<3; i++) free(acc.param[i].name);
+}
+#include LILY_PUSH_TEST()
+
+
 #define LILY_FILE_END
 #include LILY_REGISTER_TESTS()
-- 
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