From 123b9e22cd4272ef7dcf6e519b03c3ca5ba73953 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Sun, 18 Sep 2022 14:08:20 -0500
Subject: add basic mesh vertex loading

---
 src/import/import.c      |  39 ++++++++++++++
 src/import/import.test.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 175 insertions(+)

(limited to 'src/import')

diff --git a/src/import/import.c b/src/import/import.c
index cbd8d45..a4fc552 100644
--- a/src/import/import.c
+++ b/src/import/import.c
@@ -14,7 +14,46 @@ void push_vector(lua_State *L, struct aiVector3D vec)
 }
 
 
+void push_face(lua_State *L, struct aiFace face)
+{
+	lua_createtable(L, face.mNumIndices, 0);
+	int tbl = lua_gettop(L);
+
+	for (int i=0; i<face.mNumIndices; i++) {
+		lua_pushinteger(L, face.mIndices[i]);
+		lua_rawseti(L, tbl, i+1);
+	}
+}
+
+
 void push_aistring(lua_State *L, struct aiString str)
 {
 	lua_pushstring(L, str.data);
 }
+
+
+void push_mesh(lua_State *L, struct aiMesh mesh)
+{
+	int count = mesh.mNumVertices;
+
+	/* create tables */
+	lua_createtable(L, count, 0);
+	int vertices = lua_gettop(L);
+
+	/* populate */
+	for (int i=0; i<count; i++) {
+		/* positions */
+		push_vector(L, mesh.mVertices[i]);
+		lua_rawseti(L, vertices, i+1);
+	}
+
+	/* create mesh table */
+	lua_createtable(L, 0, 1);
+	int meshtbl = lua_gettop(L);
+
+	lua_pushvalue(L, vertices);
+	lua_setfield(L, meshtbl, "vertices");
+
+	/* clean up */
+	lua_remove(L, vertices);
+}
diff --git a/src/import/import.test.c b/src/import/import.test.c
index a234bda..69b781b 100644
--- a/src/import/import.test.c
+++ b/src/import/import.test.c
@@ -39,6 +39,37 @@ void test_push_vector()
 }
 
 
+void test_push_face()
+{
+	lua_State *L = luaL_newstate();
+	struct aiFace face;
+	int indices[] = { 0, 1, 2, 3, 4, 5 };
+	face.mIndices = indices;
+	face.mNumIndices = 6;
+
+	push_face(L, face);
+
+	lily_assert_int_equal(lua_type(L, -1), LUA_TTABLE);
+	int facetbl = lua_gettop(L);
+	lily_assert_int_equal(lua_objlen(L, facetbl), 6);
+
+	lua_rawgeti(L, facetbl, 1);
+	lily_assert_int_equal(lua_tointeger(L, -1), 0);
+	lua_rawgeti(L, facetbl, 2);
+	lily_assert_int_equal(lua_tointeger(L, -1), 1);
+	lua_rawgeti(L, facetbl, 3);
+	lily_assert_int_equal(lua_tointeger(L, -1), 2);
+	lua_rawgeti(L, facetbl, 4);
+	lily_assert_int_equal(lua_tointeger(L, -1), 3);
+	lua_rawgeti(L, facetbl, 5);
+	lily_assert_int_equal(lua_tointeger(L, -1), 4);
+	lua_rawgeti(L, facetbl, 6);
+	lily_assert_int_equal(lua_tointeger(L, -1), 5);
+
+	lua_close(L);
+}
+
+
 void test_push_aistring()
 {
 	lua_State *L = luaL_newstate();
@@ -54,8 +85,113 @@ void test_push_aistring()
 }
 
 
+/* --===== mesh tests =====-- */
+
+
+void create_vertices(struct aiMesh *mesh);
+void test_vertices(lua_State *L, int meshtbl);
+
+
+#define NUM_MESH_VERTICES 8
+
+
+void test_push_mesh()
+{
+	lua_State *L = luaL_newstate();
+	struct aiMesh mesh;
+	mesh.mNumVertices = NUM_MESH_VERTICES;
+
+	/* allocate memory */
+	struct aiVector3D vertices[NUM_MESH_VERTICES];
+	mesh.mVertices = vertices;
+
+	/* setup mesh */
+	create_vertices(&mesh);
+
+	/* push */	
+	int top_before = lua_gettop(L);
+	push_mesh(L, mesh);
+	int meshtbl = lua_gettop(L);
+
+	/* check output */
+	lily_assert_int_equal(lua_type(L, meshtbl), LUA_TTABLE);
+	lily_assert_int_equal(meshtbl - top_before, 1); /* make sure we cleaned up correctly */
+	test_vertices(L, meshtbl);
+
+	lua_close(L);
+}
+
+
+void create_vertices(struct aiMesh *mesh)
+{
+	mesh->mVertices[0] = (struct aiVector3D) { 0, 0, 0 };
+	mesh->mVertices[1] = (struct aiVector3D) { 0, 0, 1 };
+	mesh->mVertices[2] = (struct aiVector3D) { 0, 1, 0 };
+	mesh->mVertices[3] = (struct aiVector3D) { 0, 1, 1 };
+	mesh->mVertices[4] = (struct aiVector3D) { 1, 0, 0 };
+	mesh->mVertices[5] = (struct aiVector3D) { 1, 0, 1 };
+	mesh->mVertices[6] = (struct aiVector3D) { 1, 1, 0 };
+	mesh->mVertices[7] = (struct aiVector3D) { 1, 1, 1 };
+}
+
+
+static int check_vector(lua_State *L, int meshtbl, const char *field, int index, 
+                        float x, float y, float z)
+{
+	lua_getfield(L, meshtbl, field);
+	lily_assert(lua_type(L, -1) == LUA_TTABLE, "field '%s' is not a table!", field);
+	lua_rawgeti(L, -1, index);
+	lily_assert(lua_type(L, -1) == LUA_TTABLE, "%s[%d] is not a table!", field, index);
+
+	lua_getfield(L, -1, "x");
+	lily_assert(lua_type(L, -1) == LUA_TNUMBER, "%s[%d].x is not a number!", field, index);
+	float vx = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+
+	lua_getfield(L, -1, "y");
+	lily_assert(lua_type(L, -1) == LUA_TNUMBER, "%s[%d].y is not a number!", field, index);
+	float vy = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+
+	lua_getfield(L, -1, "z");
+	lily_assert(lua_type(L, -1) == LUA_TNUMBER, "%s[%d].z is not a number!", field, index);
+	float vz = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+
+	lua_pop(L, 2);
+	lily_assert(
+		(fabs(vx - x) < 0.1) &&
+		(fabs(vy - y) < 0.1) &&
+		(fabs(vz - z) < 0.1),
+		"%s[%d] is [%f, %f, %f], but expected [%f, %f, %f]!",
+		field, index,
+		vx, vy, vz,
+		x, y, z
+	);
+}
+
+
+void test_vertices(lua_State *L, int meshtbl)
+{
+	check_vector(L, meshtbl, "vertices", 1, 0, 0, 0);
+	check_vector(L, meshtbl, "vertices", 2, 0, 0, 1);
+	check_vector(L, meshtbl, "vertices", 3, 0, 1, 0);
+	check_vector(L, meshtbl, "vertices", 4, 0, 1, 1);
+	check_vector(L, meshtbl, "vertices", 5, 1, 0, 0);
+	check_vector(L, meshtbl, "vertices", 6, 1, 0, 1);
+	check_vector(L, meshtbl, "vertices", 7, 1, 1, 0);
+	check_vector(L, meshtbl, "vertices", 8, 1, 1, 1);
+}
+
+
+/* --===== end mesh tests =====-- */
+
+
 void suite_import()
 {
 	lily_run_test(test_push_vector);
+	lily_run_test(test_push_face);
 	lily_run_test(test_push_aistring);
+
+	lily_run_test(test_push_mesh);
 }
-- 
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