From d00d1029f9e2e9f55217ad3d21e5b826601ba210 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Mon, 6 Feb 2023 14:13:39 -0600
Subject: implement kai_read_mesh()

---
 src/geometry/geometry.c      | 77 ++++++++++++++++++++++++++++++++++++++++++++
 src/geometry/geometry.h      |  3 ++
 src/geometry/geometry.test.c | 58 +++++++++++++++++++++++++++++++++
 3 files changed, 138 insertions(+)

(limited to 'src/geometry')

diff --git a/src/geometry/geometry.c b/src/geometry/geometry.c
index 78fbaea..72af92c 100644
--- a/src/geometry/geometry.c
+++ b/src/geometry/geometry.c
@@ -340,3 +340,80 @@ void kai_release_triangles(struct ka_triangles_t t)
 }
 
 
+int kai_read_mesh(struct ka_mesh_t *dest, struct kai_tag_t *src)
+{
+	CHECK_TAG_TYPE("mesh");
+
+	dest->source_count = 0;
+	dest->source = NULL;
+	dest->triangles_count = 0;
+	dest->triangles = NULL;
+
+	/* load vertices first bc if we don't kai_release_mesh will do bad things if we hit an error */
+	struct kai_tag_t *child;
+	int result;
+
+	child = kai_tag_get_first_child_with_type(src, "vertices");
+	if (child == NULL) { return -1; }
+	result = kai_read_vertices(&(dest->vertices), child);
+	if (result != 0) { return -1; }
+
+	/* load sources */
+	unsigned int source_count = 0;
+	FOR_CHILD_OF_TYPE(src, child, "source") { source_count += 1; }
+
+	dest->source = kai_alloc(source_count * sizeof(struct ka_source_t), "mesh source array");
+	if (dest->source == NULL) { return -1; }
+
+	int i = 0;
+	FOR_CHILD_OF_TYPE(src, child, "source") {
+		result = kai_read_source(dest->source + i, child);
+		if (result != 0) {
+			dest->source_count = i;
+			kai_release_mesh(*dest);
+			return -1;
+		}
+		i += 1;
+	}
+	dest->source_count = source_count;
+
+	/* load triangles */
+	unsigned int triangles_count = 0;
+	FOR_CHILD_OF_TYPE(src, child, "triangles") { triangles_count += 1; }
+
+	dest->triangles = kai_alloc(triangles_count * sizeof(struct ka_triangles_t), "mesh triangles array");
+	if (dest->triangles == NULL) {
+		kai_release_mesh(*dest);
+		return -1;
+	}
+
+	i = 0;
+	FOR_CHILD_OF_TYPE(src, child, "triangles") {
+		result = kai_read_triangles(dest->triangles + i, child);
+		if (result != 0) {
+			dest->triangles_count = i;
+			kai_release_mesh(*dest);
+			return -1;
+		}
+		i += 1;
+	}
+	dest->triangles_count = triangles_count;
+
+	return 0;
+}
+
+void kai_release_mesh(struct ka_mesh_t m)
+{
+	int i;
+	for (i=0; i<m.source_count; i++) {
+		kai_release_source(m.source[i]);
+	}
+	free(m.source);
+
+	kai_release_vertices(m.vertices);
+
+	for (i=0; i<m.triangles_count; i++) {
+		kai_release_triangles(m.triangles[i]);
+	}
+	free(m.triangles);
+}
diff --git a/src/geometry/geometry.h b/src/geometry/geometry.h
index 26fc16b..a46af87 100644
--- a/src/geometry/geometry.h
+++ b/src/geometry/geometry.h
@@ -26,4 +26,7 @@ void kai_release_vertices(struct ka_vertices_t v);
 int kai_read_triangles(struct ka_triangles_t *dest, struct kai_tag_t *src);
 void kai_release_triangles(struct ka_triangles_t t);
 
+int kai_read_mesh(struct ka_mesh_t *dest, struct kai_tag_t *src);
+void kai_release_mesh(struct ka_mesh_t m);
+
 #endif
diff --git a/src/geometry/geometry.test.c b/src/geometry/geometry.test.c
index d918ffa..17be188 100644
--- a/src/geometry/geometry.test.c
+++ b/src/geometry/geometry.test.c
@@ -480,6 +480,64 @@ LILY_TEST("read triangles tag")
 #include LILY_PUSH_TEST()
 
 
+LILY_TEST("fail to read non-mesh tag")
+{
+	struct kai_tag_t *t = kai_parse_string(
+		"<tag />"
+	);
+
+	struct ka_mesh_t mesh;
+	int result = kai_read_mesh(&mesh, t);
+	CHECK_EQ(result, -1, "%d");
+
+	kai_tag_destroy(t);
+}
+#include LILY_PUSH_TEST()
+
+
+LILY_TEST("read mesh tag")
+{
+	struct kai_tag_t *t = kai_parse_string(
+		"<mesh>"
+		"	<source id=\"source\">"
+		"		<float_array count=\"1\">0.0</float_array>"
+		"		<technique_common>"
+		"			<accessor count=\"1\" source=\"xxx\">"
+		"				<param type=\"float\" />"
+		"			</accessor>"
+		"		</technique_common>"
+		"	</source>"
+		"	<vertices id=\"box-Vtx\">"
+		"		<input semantic=\"POSITION\" source=\"#box-Pos\"/>"
+		"	</vertices>"
+		"	<triangles count=\"2\" material=\"Bricks\">"
+		"		<input semantic=\"VERTEX\" source=\"#verts\" offset=\"0\"/>"
+		"		<input semantic=\"NORMAL\" source=\"#normal\" offset=\"1\"/>"
+		"		<p>"
+		"			0 0 1 3 2 1"
+		"			0 0 2 1 3 2"
+		"		</p>"
+		"	</triangles>"
+		"</mesh>"
+	);
+
+	struct ka_mesh_t mesh;
+	int result = kai_read_mesh(&mesh, t);
+	kai_tag_destroy(t);
+
+	REQUIRE_EQ(result, 0, "%d");
+
+	CHECK_EQ(mesh.source_count, 1, "%d");
+	CHECK_EQS(mesh.source[0].id, "source");
+	CHECK_EQS(mesh.vertices.id, "box-Vtx");
+	CHECK_EQ(mesh.triangles_count, 1, "%d");
+	CHECK_EQ(mesh.triangles[0].count, 2, "%d");
+
+	kai_release_mesh(mesh);
+}
+#include LILY_PUSH_TEST()
+
+
 
 #define LILY_FILE_END
 #include LILY_REGISTER_TESTS()
-- 
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