From f88712a929ee3543f8e1d45c6071f676df339cdb Mon Sep 17 00:00:00 2001
From: Frederico Linhares <fred@linhares.blue>
Date: Tue, 2 Aug 2022 16:52:33 -0300
Subject: refa Use Vulkan for graphics

This is a partial refactory. Some functionalities implemented in
SDL were removed and need reimplementation.
---
 src/vk/base_buffer.cpp | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/vk/base_buffer.cpp

(limited to 'src/vk/base_buffer.cpp')

diff --git a/src/vk/base_buffer.cpp b/src/vk/base_buffer.cpp
new file mode 100644
index 0000000..0846b20
--- /dev/null
+++ b/src/vk/base_buffer.cpp
@@ -0,0 +1,96 @@
+/*
+ * 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 "base_buffer.hpp"
+
+namespace VK
+{
+
+const CommandChain BaseBuffer::loader{
+  {&BaseBuffer::load_buffer, &BaseBuffer::unload_buffer},
+  {&BaseBuffer::load_memory, &BaseBuffer::unload_memory}
+};
+
+void
+BaseBuffer::load_buffer(void *obj)
+{
+  auto self = static_cast<BaseBuffer*>(obj);
+
+  VkBufferCreateInfo buffer_info = {};
+  buffer_info.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
+  buffer_info.pNext = nullptr;
+  buffer_info.flags = 0;
+  buffer_info.size = self->device_size;
+  buffer_info.usage = self->buffer_usage;
+  buffer_info.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
+  buffer_info.queueFamilyIndexCount = 0;
+  buffer_info.pQueueFamilyIndices = nullptr;
+
+  if(vkCreateBuffer(
+       self->device->device, &buffer_info, nullptr, &self->buffer)
+     != VK_SUCCESS)
+    throw CommandError{"Failed to create vertex buffer."};
+}
+
+void
+BaseBuffer::unload_buffer(void *obj)
+{
+  auto self = static_cast<BaseBuffer*>(obj);
+
+  if(self->buffer != VK_NULL_HANDLE)
+    vkDestroyBuffer(self->device->device, self->buffer, nullptr);
+}
+
+void
+BaseBuffer::load_memory(void *obj)
+{
+  auto self = static_cast<BaseBuffer*>(obj);
+
+  VkMemoryRequirements memory_requirements;
+  vkGetBufferMemoryRequirements(
+    self->device->device, self->buffer, &memory_requirements);
+
+  VkPhysicalDeviceMemoryProperties memory_properties;
+  vkGetPhysicalDeviceMemoryProperties(
+    self->device->physical_device, &memory_properties);
+
+  VkMemoryAllocateInfo alloc_info = {};
+  alloc_info.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
+  alloc_info.pNext = nullptr;
+  alloc_info.allocationSize = memory_requirements.size;
+  if(!self->device->select_memory_type(
+       &alloc_info.memoryTypeIndex, &memory_requirements,
+       self->memory_properties))
+    throw CommandError{"Could not allocate memory for Vulkan vertex buffer."};
+
+  if(vkAllocateMemory(self->device->device, &alloc_info, nullptr,
+                      &self->device_memory) != VK_SUCCESS)
+    throw CommandError{"Could not allocate memory for Vulkan vertex buffer."};
+
+  vkBindBufferMemory(
+    self->device->device, self->buffer, self->device_memory, 0);
+}
+
+void
+BaseBuffer::unload_memory(void *obj)
+{
+  auto self = static_cast<BaseBuffer*>(obj);
+
+  if(self->device_memory != VK_NULL_HANDLE)
+    vkFreeMemory(self->device->device, self->device_memory, nullptr);
+}
+
+}
-- 
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