3 files changed, 41 insertions, 10 deletions

diff --git a/src/renderer/render.c b/src/renderer/render.c
index 9d250c6..ac6b80a 100644
--- a/src/renderer/render.c
+++ b/src/renderer/render.c
@@ -1,3 +1,6 @@
+#include <stdlib.h>
+#include "mem.h"
+#include "transform_hierarchy.h"
 #define STB_IMAGE_IMPLEMENTATION
 #include <stb_image.h>
 
@@ -82,7 +85,31 @@ void default_material_init() {
   texture_data_upload(&DEFAULT_MATERIAL.specular_texture);
 }
 
-void draw_model(renderer* ren, camera* camera, model* model, transform tf, scene* scene) {
+typedef struct draw_ctx {
+  model_darray* models;
+  renderer* ren;
+  camera* cam;
+  scene* scene;
+} draw_ctx;
+bool draw_scene_node(transform_node* node, void* ctx_data) {
+  if (!node || !node->parent) return true;
+  draw_ctx* ctx = ctx_data;
+  model* m = &ctx->models->data[node->model.raw];
+  draw_model(ctx->ren, ctx->cam, m, &node->world_matrix_tf, ctx->scene);
+  return true;
+}
+
+void draw_scene(arena* frame, model_darray* models, renderer* ren, camera* camera,
+                transform_hierarchy* tfh, scene* scene) {
+  draw_ctx* ctx = arena_alloc(frame, sizeof(draw_ctx));
+  ctx->models = models;
+  ctx->ren = ren;
+  ctx->cam = camera;
+  ctx->scene = scene;
+  transform_hierarchy_dfs(transform_hierarchy_root_node(tfh), draw_scene_node, true, ctx);
+}
+
+void draw_model(renderer* ren, camera* camera, model* model, mat4* model_tf, scene* scene) {
   // TRACE("Drawing model: %s", model->name);
   mat4 view;
   mat4 proj;
@@ -105,11 +132,11 @@ void draw_model(renderer* ren, camera* camera, model* model, transform tf, scene
     }
     // TRACE("Drawing mesh %d", i);
     material* mat = &model->materials->data[m->material_index];
-    draw_mesh(ren, m, tf, mat, &view, &proj);
+    draw_mesh(ren, m, model_tf, mat, &view, &proj);
   }
 }
 
-void draw_mesh(renderer* ren, mesh* mesh, transform tf, material* mat, mat4* view, mat4* proj) {
+void draw_mesh(renderer* ren, mesh* mesh, mat4* model_tf, material* mat, mat4* view, mat4* proj) {
   shader lighting_shader = ren->blinn_phong;
 
   // bind buffer
@@ -121,12 +148,12 @@ void draw_mesh(renderer* ren, mesh* mesh, transform tf, material* mat, mat4* vie
   uniform_f32(lighting_shader.program_id, "material.shininess", 32.);
 
   // upload model transform
-  mat4 trans = mat4_translation(tf.position);
-  mat4 rot = mat4_rotation(tf.rotation);
-  mat4 scale = mat4_scale(tf.scale);
-  mat4 model_tf = mat4_mult(trans, mat4_mult(rot, scale));
+  // mat4 trans = mat4_translation(tf.position);
+  // mat4 rot = mat4_rotation(tf.rotation);
+  // mat4 scale = mat4_scale(tf.scale);
+  // mat4 model_tf = mat4_mult(trans, mat4_mult(rot, scale));
 
-  uniform_mat4f(lighting_shader.program_id, "model", &model_tf);
+  uniform_mat4f(lighting_shader.program_id, "model", model_tf);
   // upload view & projection matrices
   uniform_mat4f(lighting_shader.program_id, "view", view);
   uniform_mat4f(lighting_shader.program_id, "projection", proj);
diff --git a/src/renderer/render.h b/src/renderer/render.h
index 10702e3..1a35488 100644
--- a/src/renderer/render.h
+++ b/src/renderer/render.h
@@ -3,6 +3,7 @@
 #include "camera.h"
 #include "loaders.h"
 #include "render_types.h"
+#include "transform_hierarchy.h"
 
 // --- Lifecycle
 /** @brief initialise the render system frontend */
@@ -17,8 +18,10 @@ void render_frame_end(renderer* ren);
 
 // --- models meshes
 void model_upload_meshes(renderer* ren, model* model);
-void draw_model(renderer* ren, camera* camera, model* model, transform tf, scene* scene);
-void draw_mesh(renderer* ren, mesh* mesh, transform tf, material* mat, mat4* view, mat4* proj);
+void draw_model(renderer* ren, camera* camera, model* model, mat4* tf, scene* scene);
+void draw_mesh(renderer* ren, mesh* mesh, mat4* tf, material* mat, mat4* view, mat4* proj);
+void draw_scene(arena* frame, model_darray* models, renderer* ren, camera* camera,
+                transform_hierarchy* tfh, scene* scene);
 
 // ---
 texture texture_data_load(const char* path, bool invert_y);  // #frontend
diff --git a/src/renderer/render_types.h b/src/renderer/render_types.h
index 483e392..aed18db 100644
--- a/src/renderer/render_types.h
+++ b/src/renderer/render_types.h
@@ -18,6 +18,7 @@ struct GLFWwindow;
 
 #ifndef RESOURCE_HANDLE_DEFS
 CORE_DEFINE_HANDLE(model_handle);
+#define ABSENT_MODEL_HANDLE 999999999
 CORE_DEFINE_HANDLE(texture_handle);
 #define RESOURCE_HANDLE_DEFS
 #endif