Clean up camera code a bit

.gitignore

@@ -1,2 +1,6 @@
 /.cpcache/
 /.nrepl-port
+/.clj-kondo/
+/.lsp/
+/target/
+*.jsa

build.clj

@@ -0,0 +1,14 @@
+(ns build
+  (:require [clojure.tools.build.api :as b]))
+
+(def basis (delay (b/create-basis {:project "deps.edn"})))
+
+(defn uberjar [_]
+  (b/delete {:path "target"})
+  (b/compile-clj {:basis @basis
+                   :src-dirs ["src"]
+                   :class-dir "target/classes"})
+  (b/uber {:class-dir "target/classes"
+            :uber-file "target/nol.jar"
+            :basis @basis
+            :main 'nol.core}))

deps.edn

@@ -5,7 +5,13 @@
         org.lwjgl/lwjgl$natives-linux        {:mvn/version "3.3.4"}
         org.lwjgl/lwjgl-glfw$natives-linux   {:mvn/version "3.3.4"}
         org.lwjgl/lwjgl-opengl$natives-linux {:mvn/version "3.3.4"}
+        org.lwjgl/lwjgl-stb                  {:mvn/version "3.3.4"}
+        org.lwjgl/lwjgl-stb$natives-linux    {:mvn/version "3.3.4"}
         org.lwjgl/lwjgl-assimp               {:mvn/version "3.3.3"}
         org.lwjgl/lwjgl-assimp$natives-linux {:mvn/version "3.3.3"}
         org.joml/joml                        {:mvn/version "1.10.7"}}
- :paths ["src"]}
+ :paths ["src"]
+ :aliases {:dev {:jvm-opts ["-Djdk.attach.allowAttachSelf=true"]}
+           :build {:extra-deps {io.github.clojure/tools.build {:mvn/version "0.10.6"}}
+                   :jvm-opts ["-Dclojure.compiler.direct-linking=true"]
+                   :ns-default build}}}

shaders/base.frag

@@ -1,10 +1,14 @@
 #version 330
 
-in vec3 color;
+uniform vec4 uColor;
+uniform sampler2D texture_id;
 
+in vec2 vUV;
 out vec4 fragment;
 
 void main()
 {
-    fragment = vec4(color, 1.0);
+    vec4 tex_color = texture(texture_id, vUV);
+
+    fragment = uColor * tex_color;
 }

shaders/base.vert

@@ -1,14 +1,16 @@
 #version 330
 
-uniform mat4 MVP;
+uniform mat4 uModel;
+uniform mat4 uView;
+uniform mat4 uProjection;
 
-in vec3 vCol;
+in vec3 vPos;
-in vec2 vPos;
+in vec2 aUV;
 
-out vec3 color;
+out vec2 vUV;
 
 void main()
 {
-    gl_Position = MVP * vec4(vPos, 0.0, 1.0);
+    vUV = aUV;
-    color = vCol;
+    gl_Position = uProjection * uView * uModel * vec4(vPos, 1.0);
 }

src/nol/core.clj

@@ -1,14 +1,54 @@
 (ns nol.core
-  (:import [org.lwjgl.assimp Assimp AIScene AIMesh AIVector3D AIFace]
+  (:gen-class)
-           [org.lwjgl.glfw GLFW GLFWKeyCallbackI GLFWErrorCallbackI]
+  (:require
-           [org.lwjgl.opengl GL GL45 GL33 GL20 GL15 GL11 GL30]
+   [clojure.math])
-           [org.lwjgl.system MemoryStack MemoryUtil]
+  (:import
-           [org.joml Matrix4f]
+   [java.nio ByteBuffer FloatBuffer IntBuffer]
-           [java.nio FloatBuffer]))
+   [java.util.concurrent LinkedBlockingQueue]
+   [org.lwjgl PointerBuffer]
+   [org.lwjgl.assimp AIColor4D AIFace AIMaterial AIMatrix4x4 AIMesh AINode AIScene AIString AITexture AIVector3D Assimp]
+   [org.lwjgl.glfw GLFW GLFWKeyCallbackI]
+   [org.lwjgl.opengl GL GL11 GL20 GL30 GL45]
+   [org.lwjgl.stb STBImage]
+   [org.joml Matrix4f Vector2f Vector3f]
+   [org.lwjgl.system MemoryStack MemoryUtil]))
 
-(def vertex-shader-text (slurp "shaders/base.vert"))
+(def ^LinkedBlockingQueue render-queue (LinkedBlockingQueue.))
 
-(def fragment-shader-text (slurp "shaders/base.frag"))
+(defonce camera-fly (atom {:type :fly
+                           :pos (Vector3f.)
+                           :yaw 0.0
+                           :pitch 0.0
+                           :last-x 0.0
+                           :last-y 0.0
+                           :target (Vector3f.)
+                           :view-matrix (.identity (Matrix4f.))}))
+
+(defonce camera-orbit (atom {:type :orbit
+                             :pos (Vector3f.)
+                             :yaw 0.0
+                             :pitch 0.0
+                             :last-x 0.0
+                             :last-y 0.0
+                             :focus-point (Vector3f.)
+                             :view-matrix (.identity (Matrix4f.))}))
+
+(def state (atom {:last-time 0.0
+                  :drag-start-pos nil
+                  :current-mode :static}))
+
+(defonce gl-thread (atom nil))
+
+(defmacro with-gl [& body]
+  `(let [result# (promise)]
+     (when-not (and @gl-thread (.isAlive ^Thread @gl-thread))
+       (throw (RuntimeException. "GL thread is not running")))
+     (.put render-queue #(deliver result# (try (do ~@body)
+                                               (catch Exception e# e#))))
+     (let [r# (deref result#)]
+       (if (instance? Exception r#)
+         (throw r#)
+         r#))))
 
 (defn- compile-shader [type source]
   (let [shader (GL20/glCreateShader type)]
@@ -27,30 +67,255 @@
       (throw (RuntimeException. (str "Program link error: " (GL20/glGetProgramInfoLog program)))))
     program))
 
-(def state (atom {:last-time (GLFW/glfwGetTime)}))
+(defn ai-matrix->matrix4f [^AIMatrix4x4 m]
+  (Matrix4f. (.a1 m) (.b1 m) (.c1 m) (.d1 m)
+             (.a2 m) (.b2 m) (.c2 m) (.d2 m)
+             (.a3 m) (.b3 m) (.c3 m) (.d3 m)
+             (.a4 m) (.b4 m) (.c4 m) (.d4 m)))
 
-(defn load-model [path]
+(defn matrix4f->vectors [^Matrix4f m]
-  (Assimp/aiImportFile path (bit-or Assimp/aiProcess_Triangulate
+  [(vector (.m00 m) (.m01 m) (.m02 m) (.m03 m))
-                                    Assimp/aiProcess_FlipUVs)))
+   (vector (.m10 m) (.m11 m) (.m12 m) (.m13 m))
+   (vector (.m20 m) (.m21 m) (.m22 m) (.m23 m))
+   (vector (.m30 m) (.m31 m) (.m32 m) (.m33 m))])
 
-(def vertices (float-array [0.0 0.5 0.0
+(defn node-matrix4f [^AINode c]
-                            -0.5 0.5 0.0
+  (-> c
-                            0.5 -0.5 0.0]))
+      (.mTransformation)
+      (ai-matrix->matrix4f)))
 
-(defn- update-loop [window stack data]
+(defonce loaded-scene (atom nil))
+(defonce uploaded-scene (atom nil))
+(defonce shaders (atom nil))
+
+(defn camera-forward [^double yaw ^double pitch]
+  (Vector3f. (* (Math/cos pitch) (Math/sin yaw))
+             (Math/sin pitch)
+             (- (* (Math/cos pitch) (Math/cos yaw)))))
+
+(defn camera-right [^double yaw]
+  (Vector3f. (Math/cos yaw) 0.0 (Math/sin yaw)))
+
+(defn camera-up [^Vector3f forward ^Vector3f right]
+  (-> (Vector3f. forward) (.cross right)))
+
+(defn get-ndc [^double x ^double y ^long w ^long h]
+  [(- (* 2 (/ x w)) 1)
+   (- 1 (* 2 (/ y h)))])
+
+(defn- key-down? [window key]
+  (= (GLFW/glfwGetKey window key) GLFW/GLFW_PRESS))
+
+(defn- handle-key-actions! [_win key _scancode action _mods]
+  (when (= action GLFW/GLFW_PRESS)
+    (when (= key GLFW/GLFW_KEY_ESCAPE)
+      (swap! state assoc :should-close true))
+    (when (= key GLFW/GLFW_KEY_R)
+      (swap! state update :current-camera
+             #(merge % {:pos (Vector3f. 0.0 0.0 10.0)
+                        :yaw 0.0
+                        :pitch 0.0
+                        :focus-point (Vector3f. 0.0 0.0 0.0)
+                        :target (Vector3f.)})))))
+
+(defn- drag-detected? [^double x1 ^double y1 ^double x2 ^double y2]
+  (let [threshold 10.0
+        dx (- x2 x1)
+        dy (- y2 y1)]
+    (< threshold (+ (* dx dx) (* dy dy)))))
+
+(def cam-speed 0.04)
+
+(defn- handle-keyboard-state! [window]
+  (when-let [camera (when (= (:current-mode @state) :fly)
+                      @camera-fly)]
+    (let [move-dir (Vector3f.)
+          {:keys [yaw pitch ^Vector3f pos]} camera]
+      (when (key-down? window GLFW/GLFW_KEY_W)
+        (.add move-dir 0.0 0.0 1.0))
+      (when (key-down? window GLFW/GLFW_KEY_S)
+        (.add move-dir 0.0 0.0 -1.0))
+      (when (key-down? window GLFW/GLFW_KEY_A)
+        (.add move-dir -1.0 0.0 0.0))
+      (when (key-down? window GLFW/GLFW_KEY_D)
+        (.add move-dir 1.0 0.0 0.0))
+      (when (key-down? window GLFW/GLFW_KEY_Q)
+        (.add move-dir 0.0 1.0 0.0))
+      (when (key-down? window GLFW/GLFW_KEY_E)
+        (.add move-dir 0.0 -1.0 0.0))
+      (when (> (.length move-dir) 0.0)
+        (.normalize move-dir)
+        (let [forward ^Vector3f (camera-forward yaw pitch)
+              right ^Vector3f (camera-right yaw)
+              up ^Vector3f (camera-up forward right)
+              velocity ^Vector3f (-> (Vector3f. right)
+                                     (.mul (.x move-dir))
+                                     (.fma (.z move-dir) forward)
+                                     (.fma (.y move-dir) up)
+                                     (.mul ^double cam-speed))]
+          (.add pos velocity)))
+      (.set move-dir 0.0 0.0 0.0))))
+
+(defn- handle-mouse-move! [_window ^double xpos ^double ypos]
+  (when-let [camera (case (:current-mode @state)
+                      :fly camera-fly
+                      :orbit camera-orbit
+                      :static nil)]
+    (when (and (= (:type @camera) :orbit))
+      (let [{:keys [^double yaw ^double pitch last-x last-y]} @camera
+            last-x (double (or last-x xpos))
+            last-y (double (or last-y ypos))
+            sensitivity 0.005
+            dx (- last-x xpos)
+            dy (- last-y ypos)
+            fwd ^Vector3f (camera-forward yaw pitch)]
+        (swap! camera assoc
+               :last-x xpos
+               :last-y ypos
+               :yaw (- yaw (* dx sensitivity))
+               :pitch (-> (- pitch (* dy sensitivity))
+                          (max (- (/ Math/PI 2)))
+                          (min (/ Math/PI 2))))))
+    #_(when-let [cursor-pos ^Vector2f (:drag-start-pos @state)]
+        (when (and (drag-detected? xpos ypos (.x cursor-pos) (.y cursor-pos)))
+          (swap! state assoc :orbit-mode true)))
+    (when (and (= (:type @camera) :fly))
+      (let [{:keys [^double yaw ^double pitch pos last-x last-y]} @camera
+            last-x (double (or last-x xpos))
+            last-y (double (or last-y ypos))
+            sensitivity 0.001
+            dx (- last-x xpos)
+            dy (- last-y ypos)]
+        (swap! camera assoc
+               :last-x xpos
+               :last-y ypos
+               :yaw (- yaw (* dx sensitivity))
+               :pitch (+ pitch (* dy sensitivity)))))))
+
+(defn- get-current-cursor-pos! ^Vector2f [^MemoryStack stack ^long window]
+  (let [xbuf (.mallocDouble stack 1)
+        ybuf (.mallocDouble stack 1)]
+    (GLFW/glfwGetCursorPos window xbuf ybuf)
+    (Vector2f. (.get xbuf 0) (.get ybuf 0))))
+
+(defn- handle-mouse-buttons! [^long win button action mods]
+  (cond
+    (and (= button GLFW/GLFW_MOUSE_BUTTON_RIGHT) (= action GLFW/GLFW_PRESS))
+    (let []
+      (swap! state assoc :current-mode :fly)
+      (GLFW/glfwSetInputMode win GLFW/GLFW_CURSOR GLFW/GLFW_CURSOR_DISABLED))
+
+    (and (= button GLFW/GLFW_MOUSE_BUTTON_RIGHT) (= action GLFW/GLFW_RELEASE))
+    (let []
+      (swap! state assoc :current-mode :static)
+      (swap! camera-fly assoc :last-x nil :last-y nil)
+      (GLFW/glfwSetInputMode win GLFW/GLFW_CURSOR GLFW/GLFW_CURSOR_NORMAL))
+
+    (and (= button GLFW/GLFW_MOUSE_BUTTON_LEFT) (= action GLFW/GLFW_PRESS))
+    (do
+      (when (mods :ctrl)
+        (swap! state assoc :current-mode :orbit))
+      (swap! state assoc :drag-start-pos (get-current-cursor-pos! (MemoryStack/stackGet) win)))
+
+    (and (= button GLFW/GLFW_MOUSE_BUTTON_LEFT) (= action GLFW/GLFW_RELEASE))
+    (let []
+      (swap! state assoc :current-mode :static :drag-start-pos nil)
+      (GLFW/glfwSetCursor win MemoryUtil/NULL))))
+
+(defn render-scene [^MemoryStack stack scene node ^Matrix4f mtx]
+  (let [buf (.mallocFloat stack 16)
+        model-mtx (Matrix4f.)]
+    (.mul mtx ^Matrix4f (:transform node) model-mtx)
+    (.get model-mtx buf)
+    (when-let [mesh-indices (seq (:meshes node))]
+      (let [{:keys [gl-meshes gl-textures]} scene
+            {:keys [_program uniforms]} @shaders]
+        (doseq [idx mesh-indices
+                :let [gl-mesh (nth gl-meshes idx)
+                      mesh (:mesh gl-mesh)
+                      [r g b a] (:color mesh)
+                      tex-idx (:texture-idx mesh)]]
+          (GL20/glUniform4f (:color uniforms) r g b a)
+          (GL20/glUniformMatrix4fv ^int (:mm uniforms) false buf)
+          (GL30/glBindVertexArray (:vao gl-mesh))
+          (when tex-idx
+            (let [tex-id (:gl-id (nth gl-textures tex-idx))]
+              (GL45/glActiveTexture GL45/GL_TEXTURE0)
+              (GL11/glBindTexture GL11/GL_TEXTURE_2D tex-id)
+              (GL20/glUniform1i (:tex uniforms) 0)))
+          (GL11/glDrawElements GL11/GL_TRIANGLES (:indices-count gl-mesh) GL11/GL_UNSIGNED_INT 0))))
+    (when-let [children (seq (:children node))]
+      (doseq [child children]
+        (render-scene stack scene child model-mtx)))))
+
+(defn- camera-view-matrix [{:keys [yaw pitch ^Vector3f pos ^Vector3f target ^Matrix4f view-matrix]}]
+  (-> view-matrix
+      (.identity)
+      (.lookAt (.x pos) (.y pos) (.z pos)
+               (.x target) (.y target) (.z target)
+               0.0 1.0 0.0)))
+
+(defn- update-loop [window ^MemoryStack stack data]
   (let [w-buf (.mallocInt stack 1)
         h-buf (.mallocInt stack 1)
-        _     (GLFW/glfwGetFramebufferSize window w-buf h-buf)
+        _     (GLFW/glfwGetFramebufferSize ^long window w-buf h-buf)
         w     (.get w-buf 0)
         h     (.get h-buf 0)
-        current-time (GLFW/glfwGetTime)]
+        t (GLFW/glfwGetTime)]
     (GL11/glViewport 0 0 w h)
     (GL11/glClear GL11/GL_COLOR_BUFFER_BIT)
+    (GL11/glClear (bit-or GL11/GL_COLOR_BUFFER_BIT GL11/GL_DEPTH_BUFFER_BIT))
 
-    (swap! state assoc :last-time current-time)
+    (try
+      (when (and @uploaded-scene @shaders)
+        (handle-keyboard-state! window)
+        (let [scene @uploaded-scene
+              {:keys [program uniforms]} @shaders]
+          (GL20/glUseProgram program)
+          (let [vbuf (.mallocFloat stack 16)
+                pbuf (.mallocFloat stack 16)
+                camera (if (= :orbit (:current-mode @state))
+                         camera-orbit
+                         camera-fly)
+                view (camera-view-matrix @camera)
+                proj (:projection-matrix @state)]
+            (.get ^Matrix4f view vbuf)
+            (.get ^Matrix4f proj pbuf)
+            (GL20/glUniformMatrix4fv ^int (:mv uniforms) false vbuf)
+            (GL20/glUniformMatrix4fv ^int (:mp uniforms) false pbuf)
+            (render-scene stack scene (:hiearchy scene) (Matrix4f.)))))
+      (catch Exception e
+        (println "Update Loop GL thread error:" e)))
+
+    (GL30/glBindVertexArray 0)
+    (GL20/glUseProgram 0)
 
     (GLFW/glfwSwapBuffers window)))
 
+(defn stop! []
+  (when @uploaded-scene
+    (doseq [{:keys [^int vbo ^int vao ^int ebo]} (:gl-meshes @uploaded-scene)]
+      (GL45/glDeleteBuffers vbo)
+      (GL45/glDeleteBuffers ebo)
+      (GL30/glDeleteVertexArrays vao))
+    (doseq [{:keys [^int gl-id]} (:gl-textures @uploaded-scene)]
+      (GL11/glDeleteTextures gl-id)))
+  (reset! uploaded-scene nil)
+  (reset! shaders nil)
+  (swap! state assoc :should-close true))
+
+(defn- init [window width height]
+  (swap! state assoc
+         :window window
+         :should-close false
+         :projection-matrix 
+         (-> (Matrix4f.)
+             (.identity)
+             (.perspective (float (Math/toRadians 45))
+                           (float (/ (float width) (float height)))
+                           (float 0.1)
+                           (float 100.0))))) 
+
 (defn -main []
   (when-not (GLFW/glfwInit)
     (throw (RuntimeException. "Failed to init GLFW")))
@@ -59,37 +324,220 @@
   (GLFW/glfwWindowHint GLFW/GLFW_CONTEXT_VERSION_MINOR 5)
   (GLFW/glfwWindowHint GLFW/GLFW_OPENGL_PROFILE GLFW/GLFW_OPENGL_CORE_PROFILE)
 
-  (let [window (GLFW/glfwCreateWindow 960 592 "NOL" MemoryUtil/NULL MemoryUtil/NULL)]
+  (let [width 960 #_1900
+        height 500 #_1100
+        window (GLFW/glfwCreateWindow 960 500 "NOL" MemoryUtil/NULL MemoryUtil/NULL)]
     (when (= window MemoryUtil/NULL)
       (GLFW/glfwTerminate)
       (throw (RuntimeException. "Failed to create window")))
 
+
     (GLFW/glfwMakeContextCurrent window)
     (GL/createCapabilities)
+    (GL11/glEnable GL11/GL_DEPTH_TEST)
+    (GL11/glEnable GL11/GL_CULL_FACE)
+    (GL11/glCullFace GL11/GL_BACK)
     (GLFW/glfwSwapInterval 1)
 
     (GLFW/glfwSetKeyCallback window
       (reify GLFWKeyCallbackI
         (invoke [_ win key scancode action mods]
-          (when (and (= key GLFW/GLFW_KEY_ESCAPE) (= action GLFW/GLFW_PRESS))
+          (try
-            (GLFW/glfwSetWindowShouldClose win true)))))
+            (handle-key-actions! win key scancode action mods)
-
+            (catch Exception e
+              (println "Key Callback Exception:" e))))))
+    (when (GLFW/glfwRawMouseMotionSupported)
+      (GLFW/glfwSetInputMode window GLFW/GLFW_RAW_MOUSE_MOTION GLFW/GLFW_TRUE))
+    (GLFW/glfwSetCursorPosCallback window
+      (reify org.lwjgl.glfw.GLFWCursorPosCallbackI
+        (invoke [_ win xpos ypos]
+          (try
+            (handle-mouse-move! win xpos ypos)
+            (catch Exception e
+              (println "Cursor Pos Callback Exception:" e))))))
+    (GLFW/glfwSetMouseButtonCallback window
+      (reify org.lwjgl.glfw.GLFWMouseButtonCallbackI
+        (invoke [_ win button action mods]
+          (try
+            (let [mods (cond-> #{}
+                         (pos? (bit-and mods GLFW/GLFW_MOD_SHIFT))   (conj :shift)
+                         (pos? (bit-and mods GLFW/GLFW_MOD_CONTROL)) (conj :ctrl)
+                         (pos? (bit-and mods GLFW/GLFW_MOD_ALT))     (conj :alt)
+                         (pos? (bit-and mods GLFW/GLFW_MOD_SUPER))   (conj :super))]
+              (handle-mouse-buttons! win button action mods))
+            (catch Exception e
+              (println "Mouse Button Callback Exception:" e))))))
+    (init window width height)
     (loop []
-      (when-not (GLFW/glfwWindowShouldClose window)
+      (loop []
+        (when-let [f (.poll render-queue)]
+          (f)
+          (recur)))
+      (when-not (or (:should-close @state)
+                    (GLFW/glfwWindowShouldClose window))
         (GLFW/glfwPollEvents)
         (let [stack (MemoryStack/stackPush)]
           (try
-            (update-loop window stack)
+            (update-loop window stack {})
             (finally
               (MemoryStack/stackPop))))
         (recur)))
 
+    (stop!)
     (GLFW/glfwDestroyWindow window)
     (GLFW/glfwTerminate)))
 
+(defn start! []
+  (when (and @gl-thread (.isAlive ^Thread @gl-thread))
+    (throw (RuntimeException. "Already running")))
+  (reset! gl-thread
+    (doto (Thread. (fn []
+                     (try
+                       (-main)
+                       (catch Exception e
+                         (println "GL thread error:" e)))))
+      (.setName "opengl-thread")
+      (.setDaemon true)
+      (.start))))
+
+(defn load-model [^String path]
+  (let [flags (bit-or Assimp/aiProcess_Triangulate
+                      Assimp/aiProcess_FlipUVs)]
+    (Assimp/aiImportFile path flags)))
+
+(defn extract-mesh [^AIScene scene ^long idx]
+  (let [meshes ^PointerBuffer (.mMeshes scene)]
+    (let [mesh (AIMesh/create (long (.get meshes idx)))
+          mat-idx (.mMaterialIndex mesh)
+          mat-ptr ^long (.get (.mMaterials scene) mat-idx)
+          material (AIMaterial/create (long mat-ptr))
+          mat-color (AIColor4D/create)
+          _ (Assimp/aiGetMaterialColor material Assimp/AI_MATKEY_COLOR_DIFFUSE 0 0 ^AIColor4D mat-color)
+          ^IntBuffer no-int nil
+          ^FloatBuffer no-float nil
+          path (AIString/create)
+          _ (Assimp/aiGetMaterialTexture material Assimp/aiTextureType_DIFFUSE 0 path no-int no-int no-float no-int no-int no-int)
+          data-path (.dataString path)
+          verts (.mVertices mesh)
+          n (.mNumVertices mesh)
+          vert-arr (float-array (* 5 n))
+          faces (.mFaces mesh)
+          nf (.mNumFaces mesh)
+          idx-arr (int-array (* 3 nf))
+          uvs (.mTextureCoords mesh 0)]
+      (dotimes [i n]
+        (let [vert ^AIVector3D (.get verts i)
+              uv (when uvs (.get uvs i))
+              [^float u ^float v] (if uvs [(.x ^AIVector3D uv) (.y ^AIVector3D uv)] [0.0 0.0])]
+          (aset vert-arr (+ (* i 5) 0) (.x vert))
+          (aset vert-arr (+ (* i 5) 1) (.y vert))
+          (aset vert-arr (+ (* i 5) 2) (.z vert))
+          (aset vert-arr (+ (* i 5) 3) u)
+          (aset vert-arr (+ (* i 5) 4) v)))
+      (dotimes [i nf]
+        (let [face ^AIFace (.get faces i)
+              idxs (.mIndices face)]
+          (aset idx-arr (+ (* i 3) 0) (.get idxs 0))
+          (aset idx-arr (+ (* i 3) 1) (.get idxs 1))
+          (aset idx-arr (+ (* i 3) 2) (.get idxs 2))))
+      {:verts vert-arr :indices idx-arr :mat-idx (.mMaterialIndex mesh)
+       :texture-idx (when (.startsWith data-path "*")
+                      (parse-long (subs data-path 1)))
+       :color [(.r mat-color) (.g mat-color) (.b mat-color) (.a mat-color)]})))
+
+(defn traverse [^AINode node]
+  {:node node
+   :meshes (let [buf (.mMeshes node)]
+             (mapv #(.get buf ^int %) (range (.mNumMeshes node))))
+   :transform (node-matrix4f node)
+   :children (mapv #(traverse (AINode/create ^long (.get (.mChildren node) ^int %)))
+                   (range (.mNumChildren node)))})
+
+(defn load-scene [path]
+  (let [scene ^AIScene (load-model path)
+        meshes (doall
+                 (for [i (range (.mNumMeshes scene))]
+                   (extract-mesh scene i)))
+        textures (let [texs (.mTextures scene)]
+                   (doall
+                     (for [i (range (.mNumTextures scene))]
+                       (let [ai-tex (AITexture/create (.get texs ^int i))
+                             buf (.pcDataCompressed ai-tex)
+                             w (int-array 1)
+                             h (int-array 1)
+                             channels (int-array 1)]
+                         {:data (STBImage/stbi_load_from_memory buf w h channels 4)
+                          :w (aget w 0) :h (aget h 0)}))))
+        hiearchy (traverse (.mRootNode scene))]
+    (Assimp/aiReleaseImport scene)
+    {:meshes meshes :textures textures :hiearchy hiearchy}))
+
+(defn upload-scene! [scene]
+  (let [gl-meshes
+        (mapv
+          #(let [vbo ^int (GL45/glCreateBuffers)
+                 ebo ^int (GL45/glCreateBuffers)
+                 vao ^int (GL45/glCreateVertexArrays)]
+             (GL45/glNamedBufferStorage vbo ^floats (:verts %)   GL45/GL_DYNAMIC_STORAGE_BIT)
+             (GL45/glNamedBufferStorage ebo ^ints (:indices %) GL45/GL_DYNAMIC_STORAGE_BIT)
+             (GL45/glVertexArrayElementBuffer vao ebo)
+             (GL45/glVertexArrayVertexBuffer vao 0 vbo 0 (* 5 Float/BYTES))
+
+             (GL45/glVertexArrayAttribFormat vao 0 3 GL11/GL_FLOAT false 0)
+             (GL45/glVertexArrayAttribBinding vao 0 0)
+
+             (GL45/glVertexArrayAttribFormat vao 1 2 GL11/GL_FLOAT false (* 3 Float/BYTES))
+             (GL45/glVertexArrayAttribBinding vao 1 0)
+
+             (GL45/glEnableVertexArrayAttrib vao 0)
+             (GL45/glEnableVertexArrayAttrib vao 1)
+             {:vbo vbo :vao vao :ebo ebo
+              :mesh %
+              :indices-count (alength ^ints (:indices %))})
+          (:meshes scene))
+        gl-textures
+        (mapv
+          #(let [w (:w %)
+                 h (:h %)
+                 tex-id (GL45/glCreateTextures GL11/GL_TEXTURE_2D)]
+             (GL45/glTextureStorage2D tex-id 1 GL11/GL_RGBA8 w h)
+             (GL45/glTextureSubImage2D tex-id 0 0 0 ^int w ^int h GL11/GL_RGBA GL11/GL_UNSIGNED_BYTE ^ByteBuffer (:data %))
+             (GL45/glTextureParameteri tex-id GL11/GL_TEXTURE_MIN_FILTER GL11/GL_LINEAR)
+             (GL45/glTextureParameteri tex-id GL11/GL_TEXTURE_MAG_FILTER GL11/GL_LINEAR)
+             (assoc % :gl-id tex-id))
+          (:textures scene))]
+    (assoc scene :gl-textures gl-textures :gl-meshes gl-meshes)))
+
+(defn load-shaders! [vert-path frag-path]
+  (let [vert (compile-shader GL20/GL_VERTEX_SHADER (slurp vert-path))
+        frag (compile-shader GL20/GL_FRAGMENT_SHADER (slurp frag-path))
+        program (link-program vert frag)]
+    {:program program
+     :uniforms {:color (GL20/glGetUniformLocation ^int program "uColor")
+                :tex (GL20/glGetUniformLocation ^int program "texture_id")
+                :mm (GL20/glGetUniformLocation ^int program "uModel")
+                :mv (GL20/glGetUniformLocation ^int program "uView")
+                :mp (GL20/glGetUniformLocation ^int program "uProjection")}}))
+
 (comment
-  (-main)
+  (start!)
-  (def ^AIScene scene (load-model "assets/model.glb"))
+  (with-gl (stop!))
-  (.mNumMeshes scene) ;; 54
+
-  (.mNumMaterials scene) ;; 17
+  (reset! loaded-scene
+          (do
+            (when @loaded-scene
+              (doseq [tex (:textures @loaded-scene)]
+                (when-let [data (:data tex)]
+                  (STBImage/stbi_image_free ^ByteBuffer data))))
+            (load-scene "assets/model.glb")))
+  (reset! uploaded-scene (with-gl (upload-scene! @loaded-scene)))
+  (reset! shaders (with-gl (load-shaders! "shaders/base.vert" "shaders/base.frag")))
+
+  (swap! state assoc :current-state :static)
+
+  (with-gl
+    (GL11/glClearColor 0.392 0.584 0.929 1.0))
+  (with-gl
+    (GL11/glClearColor 0.2 0.25 0.3 1.0))
+
   :-)