From fd52d577402465036552ee0a589741df728e482d Mon Sep 17 00:00:00 2001
From: Lightling <contactlightling@gmail.com>
Date: Sun, 13 Feb 2022 13:04:09 -0500
Subject: [PATCH] add camera

---
 Camera.cpp                  | 78 +++++++++++++++++++++++++++++++++++++
 Camera.h                    | 35 +++++++++++++++++
 DX11Starter.vcxproj         |  2 +
 DX11Starter.vcxproj.filters |  6 +++
 4 files changed, 121 insertions(+)
 create mode 100644 Camera.cpp
 create mode 100644 Camera.h

diff --git a/Camera.cpp b/Camera.cpp
new file mode 100644
index 0000000..ccc36be
--- /dev/null
+++ b/Camera.cpp
@@ -0,0 +1,78 @@
+#include "Camera.h"
+
+using namespace DirectX;
+
+Camera::Camera(float _x, float _y, float _z, float _aspect, float _fov, float _near, float _far)
+{
+	transform.SetPosition(_x, _y, _z);
+
+	aspect = _aspect;
+	fovYRadians = XMConvertToRadians(_fov);
+	clipNear = _near;
+	clipFar = _far;
+
+	UpdateViewMatrix();
+	UpdateProjectionMatrix();
+}
+
+Camera::~Camera()
+{
+}
+
+void Camera::Update(float _dt)
+{
+	transform.TranslateRelative(0, 0, _dt);
+	UpdateViewMatrix();
+}
+
+void Camera::UpdateViewMatrix()
+{
+	XMFLOAT3 worldUp = XMFLOAT3(0, 1, 0);
+	XMMATRIX view = XMMatrixLookToLH(XMLoadFloat3(&transform.GetPosition()), XMLoadFloat3(&transform.GetForward()), XMLoadFloat3(&worldUp));
+	XMStoreFloat4x4(&viewMatrix, view);
+}
+
+void Camera::UpdateProjectionMatrix()
+{
+	XMMATRIX projection = XMMatrixPerspectiveFovLH(fovYRadians, aspect, clipNear, clipFar);
+	XMStoreFloat4x4(&projectionMatrix, projection);
+}
+
+Transform* Camera::GetTransform()
+{
+	return &transform;
+}
+
+DirectX::XMFLOAT4X4 Camera::GetViewMatrix()
+{
+	return viewMatrix;
+}
+
+DirectX::XMFLOAT4X4 Camera::GetProjectionMatrix()
+{
+	return projectionMatrix;
+}
+
+void Camera::SetAspect(float _aspect)
+{
+	aspect = _aspect;
+	UpdateProjectionMatrix();
+}
+
+void Camera::SetFOV(float _fov)
+{
+	fovYRadians = XMConvertToRadians(_fov);
+	UpdateProjectionMatrix();
+}
+
+void Camera::SetNearClip(float _near)
+{
+	clipNear = _near;
+	UpdateProjectionMatrix();
+}
+
+void Camera::SetFarClip(float _far)
+{
+	clipFar = _far;
+	UpdateProjectionMatrix();
+}
diff --git a/Camera.h b/Camera.h
new file mode 100644
index 0000000..5e49872
--- /dev/null
+++ b/Camera.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "Transform.h"
+#include <memory>
+
+class Camera
+{
+public:
+	Camera(float _x, float _y, float _z, float _aspect, float _fov, float _near, float _far);
+	~Camera();
+
+	void				Update(float _dt);
+	void				UpdateViewMatrix();
+	void				UpdateProjectionMatrix();
+
+	Transform*			GetTransform();
+	DirectX::XMFLOAT4X4 GetViewMatrix();
+	DirectX::XMFLOAT4X4 GetProjectionMatrix();
+
+	void				SetAspect(float _aspect);
+	void				SetFOV(float _fov);
+	void				SetNearClip(float _near);
+	void				SetFarClip(float _far);
+
+private:
+	float				aspect;
+	float				fovYRadians;
+	float				clipNear;
+	float				clipFar;
+
+	DirectX::XMFLOAT4X4 viewMatrix;
+	DirectX::XMFLOAT4X4 projectionMatrix;
+
+	Transform			transform;
+};
diff --git a/DX11Starter.vcxproj b/DX11Starter.vcxproj
index e3338d0..d2480fb 100644
--- a/DX11Starter.vcxproj
+++ b/DX11Starter.vcxproj
@@ -123,6 +123,7 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="Camera.cpp" />
     <ClCompile Include="DXCore.cpp" />
     <ClCompile Include="Entity.cpp" />
     <ClCompile Include="Game.cpp" />
@@ -133,6 +134,7 @@
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="BufferStructs.h" />
+    <ClInclude Include="Camera.h" />
     <ClInclude Include="DXCore.h" />
     <ClInclude Include="Entity.h" />
     <ClInclude Include="Game.h" />
diff --git a/DX11Starter.vcxproj.filters b/DX11Starter.vcxproj.filters
index 0ee7d77..1bc47d3 100644
--- a/DX11Starter.vcxproj.filters
+++ b/DX11Starter.vcxproj.filters
@@ -39,6 +39,9 @@
     <ClCompile Include="Entity.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="Camera.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Vertex.h">
@@ -65,6 +68,9 @@
     <ClInclude Include="Entity.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="Camera.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <FxCompile Include="PixelShader.hlsl">