2 files changed, 123 insertions, 0 deletions
diff --git a/src/model/instance.cpp b/src/model/instance.cpp
new file mode 100644
index 0000000..83a93c2
--- /dev/null
+++ b/src/model/instance.cpp
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2022 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "instance.hpp"
+
+#include "../model.hpp"
+#include "../vk/model_instance.hpp"
+
+// This variable works as a constant
+static mrb_sym id_at_model;
+
+void
+cg_free_model_instance(mrb_state *mrb, void* obj)
+{
+  auto ptr = static_cast<VK::ModelInstance*>(obj);
+
+  mrb_free(mrb, ptr);
+}
+
+const struct mrb_data_type cg_model_instance_type = {
+  "CG_Model_Instance", cg_free_model_instance };
+
+static mrb_value
+cg_cModel_cInstance_initialize(mrb_state *mrb, mrb_value self)
+{
+  mrb_float position_x, position_y, position_z,
+    rotation_x, rotation_y, rotation_z;
+  mrb_value model;
+  VK::ModelInstance *ptr;
+
+  mrb_get_args(
+    mrb, "offffff",
+    &model,
+    &position_x, &position_y, &position_z,
+    &rotation_x, &rotation_y, &rotation_z);
+  ptr = (VK::ModelInstance*)DATA_PTR(self);
+  if(ptr) mrb_free(mrb, ptr);
+  ptr = (VK::ModelInstance*)mrb_malloc(mrb, sizeof(VK::ModelInstance));
+
+  mrb_iv_set(mrb, self, id_at_model, model);
+  ptr->position = glm::vec3(position_x, position_y, position_z);
+  ptr->rotation = glm::vec3(rotation_x, rotation_y, rotation_z);
+
+  mrb_data_init(self, ptr, &cg_model_instance_type);
+  return self;
+}
+
+static mrb_value
+cg_cModel_cInstance_draw(mrb_state *mrb, mrb_value self)
+{
+  mrb_value model_v;
+
+  VK::ModelInstance *ptr;
+  std::shared_ptr<VK::Model> *model_ptr;
+
+  model_v = mrb_iv_get(mrb, self, id_at_model);
+  ptr = (VK::ModelInstance*)DATA_PTR(self);
+  model_ptr = (std::shared_ptr<VK::Model>*) DATA_PTR(model_v);
+
+  auto &instances =
+    cg_core.vk_graphics_pipeline->models_to_draw[
+      cg_core.vk_graphics_pipeline->current_frame][*model_ptr];
+  instances.push_back(*ptr);
+
+  return self;
+}
+
+void
+cg_model_instance_init(mrb_state *mrb)
+{
+  struct RClass *cg_m, *cg_cModel, *cg_cInstance;
+
+  id_at_model = mrb_intern_cstr(mrb, "@model");
+
+  cg_m = mrb_module_get(mrb, "CandyGear");
+  cg_cModel = mrb_class_get_under(mrb, cg_m, "Model");
+  cg_cInstance = mrb_define_class_under(
+    mrb, cg_cModel, "Instance", mrb->object_class);
+  MRB_SET_INSTANCE_TT(cg_cInstance, MRB_TT_DATA);
+  mrb_define_method(
+    mrb, cg_cInstance, "initialize", cg_cModel_cInstance_initialize,
+    MRB_ARGS_REQ(7));
+  mrb_define_method(
+    mrb, cg_cInstance, "draw", cg_cModel_cInstance_draw, MRB_ARGS_NONE());
+}
diff --git a/src/model/instance.hpp b/src/model/instance.hpp
new file mode 100644
index 0000000..f84003c
--- /dev/null
+++ b/src/model/instance.hpp
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2022 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_MODEL_INSTANCE_H
+#define CANDY_GEAR_MODEL_INSTANCE_H 1
+
+#include "../core.hpp"
+
+void
+cg_model_instance_init(mrb_state *mrb);
+
+#endif /* CANDY_GEAR_MODEL_INSTANCE_H */