update models/models_loading_gltf.c to play gltf animation

Updated the .blend file to use weights rather than bone parents so it
fits into the framework. Exported with weights to the .glb file.

examples/models/models_loading_gltf.c

@@ -35,9 +35,10 @@ int main(void)
 
     // Loaf gltf model
     Model model = LoadModel("resources/models/gltf/robot.glb");
-    unsigned int animationCount;
+    unsigned int animsCount;
-    ModelAnimation *modelAnimations = LoadModelAnimations("resources/models/gltf/robot.glb", &animationCount);
+    ModelAnimation *modelAnimations = LoadModelAnimations("resources/models/gltf/robot.glb", &animsCount);
-    ModelAnimation anim = modelAnimations[0];
+
+    unsigned int animIndex = 0;
 
     Vector3 position = { 0.0f, 0.0f, 0.0f };    // Set model position
 
@@ -46,13 +47,24 @@ int main(void)
     SetTargetFPS(60);                   // Set our game to run at 60 frames-per-second
     //--------------------------------------------------------------------------------------
 
+    unsigned int currentFrame = 0;
+
     // Main game loop
     while (!WindowShouldClose())        // Detect window close button or ESC key
     {
         // Update
         //----------------------------------------------------------------------------------
+        ModelAnimation anim = modelAnimations[animIndex];
+        if(IsKeyPressed(KEY_UP)) {
+            animIndex = (animIndex + 1) % animsCount;
+        }
+        if(IsKeyPressed(KEY_DOWN)) {
+            animIndex = (animIndex + animsCount - 1) % animsCount;
+        }
+
+        currentFrame = (currentFrame + 1) % anim.frameCount;
+        UpdateModelAnimation(model, anim, currentFrame);
         UpdateCamera(&camera);
-        UpdateModelAnimation(model, anim, 2);
         //----------------------------------------------------------------------------------
 
         // Draw
@@ -68,6 +80,8 @@ int main(void)
 
             EndMode3D();
 
+            DrawText("Use the up/down arrow keys to switch animation.", 10, 10, 20, WHITE);
+
         EndDrawing();
         //----------------------------------------------------------------------------------
     }