From c593c24b62b274fbc1d465f0386a0c5d32423f4f Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Mon, 12 Feb 2024 17:42:57 -0800
Subject: Initial implementation for an asset cache.

---
 game/src/plugins/viewer.c | 69 +++++++++++++++++++++++++++++------------------
 1 file changed, 43 insertions(+), 26 deletions(-)

(limited to 'game')

diff --git a/game/src/plugins/viewer.c b/game/src/plugins/viewer.c
index 83fc8ed..1ed3b9d 100644
--- a/game/src/plugins/viewer.c
+++ b/game/src/plugins/viewer.c
@@ -30,31 +30,33 @@ struct State {
 };
 
 /// Load the skyquad texture.
-static Texture* load_environment_map(RenderBackend* render_backend) {
+static Texture* load_environment_map(Gfx* gfx) {
+  assert(gfx);
   return gfx_load_texture(
-      render_backend,
-      &(LoadTextureCmd){
-          .origin                 = TextureFromFile,
-          .type                   = LoadCubemap,
-          .colour_space           = sRGB,
-          .filtering              = NearestFiltering,
-          .mipmaps                = false,
-          .data.cubemap.filepaths = {
-                                     mstring_make("/assets/skybox/clouds1/clouds1_east.bmp"),
-                                     mstring_make("/assets/skybox/clouds1/clouds1_west.bmp"),
-                                     mstring_make("/assets/skybox/clouds1/clouds1_up.bmp"),
-                                     mstring_make("/assets/skybox/clouds1/clouds1_down.bmp"),
-                                     mstring_make("/assets/skybox/clouds1/clouds1_south.bmp"),
-                                     mstring_make("/assets/skybox/clouds1/clouds1_north.bmp")}
+      gfx, &(LoadTextureCmd){
+               .origin                 = AssetFromFile,
+               .type                   = LoadCubemap,
+               .colour_space           = sRGB,
+               .filtering              = NearestFiltering,
+               .mipmaps                = false,
+               .data.cubemap.filepaths = {
+                                          mstring_make("/assets/skybox/clouds1/clouds1_east.bmp"),
+                                          mstring_make("/assets/skybox/clouds1/clouds1_west.bmp"),
+                                          mstring_make("/assets/skybox/clouds1/clouds1_up.bmp"),
+                                          mstring_make("/assets/skybox/clouds1/clouds1_down.bmp"),
+                                          mstring_make("/assets/skybox/clouds1/clouds1_south.bmp"),
+                                          mstring_make("/assets/skybox/clouds1/clouds1_north.bmp")}
   });
 }
 
 /// Load the skyquad and return the environment light node.
-static SceneNode* load_skyquad(RenderBackend* render_backend, SceneNode* root) {
-  assert(render_backend);
+static SceneNode* load_skyquad(Gfx* gfx, SceneNode* root) {
+  assert(gfx);
   assert(root);
 
-  Texture* environment_map = load_environment_map(render_backend);
+  RenderBackend* render_backend = gfx_get_render_backend(gfx);
+
+  Texture* environment_map = load_environment_map(gfx);
   if (!environment_map) {
     return 0;
   }
@@ -70,20 +72,19 @@ static SceneNode* load_scene(
   assert(state);
   assert(state->scene);
 
-  SceneNode*     root           = gfx_get_scene_root(state->scene);
-  RenderBackend* render_backend = gfx_get_render_backend(game->gfx);
-
   Camera* camera = gfx_get_camera_camera(state->camera);
   spatial3_set_position(&camera->spatial, vec3_make(0, 0, 2));
 
-  SceneNode* sky_light_node = load_skyquad(render_backend, root);
+  SceneNode* root           = gfx_get_scene_root(state->scene);
+  SceneNode* sky_light_node = load_skyquad(game->gfx, root);
   if (!sky_light_node) {
-    return 0;
+    return 0; // test
   }
 
   SceneNode* scene_node = gfx_load_scene(
       game->gfx, sky_light_node,
-      &(LoadSceneCmd){.origin = SceneFromFile, .filepath = scene_filepath});
+      &(LoadSceneCmd){
+          .origin = AssetFromFile, .filepath = mstring_make(scene_filepath)});
   if (!scene_node) {
     return 0;
   }
@@ -136,6 +137,10 @@ cleanup:
 void shutdown(Game* game, State* state) {
   assert(game);
   if (state) {
+    // TODO: Destroying the scene here currently does not play well with asset
+    //  reloading. The issue is that we expect to mutate the scene/model during
+    //  animation. This needs to change if we want to be able to cache assets
+    //  in memory.
     gfx_destroy_camera(&state->camera);
     gfx_destroy_scene(&state->scene);
     // State freed by plugin engine.
@@ -165,8 +170,20 @@ static void render_bounding_boxes_rec(ImmRenderer* imm, const SceneNode* node) {
   assert(node);
   if (gfx_get_node_type(node) == ObjectNode) {
     // TODO: Look at the scene log. The JointNodes are detached from the
-    // ObjectNodes. This is why the boxes are not being transformed as expected
-    // here. Anima needs to animate boxes? Use OOBB in addition to AABB?
+    //  ObjectNodes. This is why the boxes are not being transformed as expected
+    //  here. Anima needs to animate boxes? Use OOBB in addition to AABB?
+    //
+    // TODO: Idea: when a model is loaded, compute an OOBB per joint using the
+    //  vertices that are affected by the joint. Then transform this OOBB when
+    //  animating the skeleton. Start with AABB for simplicity. The AABB/OOBB
+    //  in the skeleton should be const. The transform AABB/OOBB is derived
+    //  on demand. Stack allocator would be best for this kind of per-frame
+    //  data.
+    //
+    // TODO: After computing joint AABB/OOBBs, check here whether the node has
+    //  a skeleton, and if so, render the skeleton's boxes instead of the
+    //  node's (the node's boxes are not animated, but computer from the rest
+    //  pose).
     const mat4         model = gfx_get_node_global_transform(node);
     const SceneObject* obj   = gfx_get_node_object(node);
     const aabb3        box   = gfx_calc_object_aabb(obj);
-- 
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