From ba9a7162b72e6b20466de7dd115719777315b5c2 Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Sat, 5 Dec 2020 18:37:44 -0600
Subject: switch meshes to use metamathods

---
 demo/SpatialShader.lua |  6 +++---
 demo/main.lua          |  4 ++--
 src/mesh.c             | 17 +++++++++++++----
 src/mesh.h             |  2 ++
 src/primitives.c       |  4 ++++
 5 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/demo/SpatialShader.lua b/demo/SpatialShader.lua
index 699cff2..0c65176 100644
--- a/demo/SpatialShader.lua
+++ b/demo/SpatialShader.lua
@@ -74,10 +74,10 @@ SpatialShader.prototype.setCamera = function(self, camera)
    self.shader:setMat4('projection', camera.projection)
 end
 
-SpatialShader.prototype.drawMesh = function(self, mesh)
-   self.shader:setMat4('model', mesh.transform)
+SpatialShader.prototype.drawMesh = function(self, meshInstance)
+   self.shader:setMat4('model', meshInstance.transform)
    self.albedo:use(0)
-   honey.mesh.draw(mesh.mesh, self.shader)
+   meshInstance.mesh:draw(self.shader)
 end
 
 -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/demo/main.lua b/demo/main.lua
index 5b19166..8e8d3d3 100644
--- a/demo/main.lua
+++ b/demo/main.lua
@@ -20,7 +20,7 @@ local lightDirection = honey.glm.vec3{1,1,1}
 lightDirection:normalize()
 shader:setVec3('directional_lights[0].direction', lightDirection)
 shader:setVec3('directional_lights[0].color', honey.glm.vec3{0,1,0})
-local meshes = honey.mesh.load('Suzanne.obj')
+local meshes = honey.mesh('Suzanne.obj')
 local suzanne = MeshInstance.new(sceneRoot,
                                  honey.glm.vec3{0,0,3},
                                  honey.glm.vec3{0,math.pi,0},
@@ -41,7 +41,7 @@ local plane2 = MeshInstance.new(suzanne,
                                 shader)
 
 suzanne.update = function(self, dt)
-   self:rotate('y', 10*dt)
+   self:rotate('y', dt)
 end
 
 local total_frames = 0
diff --git a/src/mesh.c b/src/mesh.c
index e3b3a43..85364a8 100644
--- a/src/mesh.c
+++ b/src/mesh.c
@@ -1,5 +1,7 @@
 #include "mesh.h"
 
+int honey_mesh_mt_ref = LUA_NOREF;
+
 static int honey_mesh_lua_draw(lua_State* L)
 {
     honey_mesh* mesh;
@@ -22,10 +24,14 @@ static int honey_mesh_lua_delete(lua_State* L)
 void honey_setup_mesh(lua_State* L)
 {
     honey_lua_create_table
-	(L, 3,
-	 HONEY_FUNCTION, "load",  honey_mesh_load,
-	 HONEY_FUNCTION, "draw",  honey_mesh_lua_draw,
-	 HONEY_FUNCTION, "delete",  honey_mesh_lua_delete);
+	(L, 2,
+	 HONEY_TABLE, "__index", 1,
+	 HONEY_FUNCTION, "draw", honey_mesh_lua_draw,
+
+	 HONEY_FUNCTION, "__gc", honey_mesh_lua_delete);
+    honey_mesh_mt_ref = luaL_ref(L, LUA_REGISTRYINDEX);
+
+    lua_pushcfunction(L, honey_mesh_load);
     lua_setfield(L, -2, "mesh");
 }
 
@@ -107,6 +113,9 @@ static void process_nodes_recursively(lua_State* L,
 {
     for (int i=0; i<node->mNumMeshes; i++) {
         honey_mesh* mesh = lua_newuserdata(L, sizeof(honey_mesh));
+	lua_rawgeti(L, LUA_REGISTRYINDEX, honey_mesh_mt_ref);
+	lua_setmetatable(L, -2);
+	
         struct aiMesh* assimp_mesh = scene->mMeshes[node->mMeshes[i]];
         *mesh = assimp_to_honey_mesh(assimp_mesh, scene);
         lua_rawseti(L, -2, *n_meshes);
diff --git a/src/mesh.h b/src/mesh.h
index 70b7f4d..c97e3cb 100644
--- a/src/mesh.h
+++ b/src/mesh.h
@@ -8,6 +8,8 @@
 
 #include "common.h"
 
+extern int honey_mesh_mt_ref;
+
 typedef struct {
     unsigned int n_vertices, n_indices;
   unsigned int vertex_array, vertex_buffer, element_buffer;
diff --git a/src/primitives.c b/src/primitives.c
index ee68f6a..d858cc6 100644
--- a/src/primitives.c
+++ b/src/primitives.c
@@ -8,6 +8,8 @@ static int honey_mesh_lua_plane(lua_State* L)
                               HONEY_NUMBER, &height);
 
     honey_mesh* mesh = lua_newuserdata(L, sizeof(honey_mesh));
+    lua_rawgeti(L, LUA_REGISTRYINDEX, honey_mesh_mt_ref);
+    lua_setmetatable(L, -2);
     if (honey_mesh_new_textured_plane(mesh, width, height) != HONEY_OK) {
         lua_pushstring(L, "error encountered while building plane");
         lua_error(L);
@@ -24,6 +26,8 @@ static int honey_mesh_lua_cube(lua_State* L)
                               HONEY_NUMBER, &depth);
 
     honey_mesh* mesh = lua_newuserdata(L, sizeof(honey_mesh));
+    lua_rawgeti(L, LUA_REGISTRYINDEX, honey_mesh_mt_ref);
+    lua_setmetatable(L, -2);
     if (honey_mesh_new_textured_cube(mesh, width, height, depth) != HONEY_OK) {
         lua_pushstring(L, "error encountered while building plane");
         lua_error(L);
-- 
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