2 files changed, 121 insertions, 0 deletions
diff --git a/src/camera/camera.cpp b/src/camera/camera.cpp
new file mode 100644
index 0000000..62e8021
--- /dev/null
+++ b/src/camera/camera.cpp
@@ -0,0 +1,72 @@
+#include <stdexcept>
+#include "camera.h"
+
+Camera::Camera(SceneCameraData cameraData) :
+    m_pos(cameraData.pos),
+    m_heightAngle(cameraData.heightAngle),
+    m_focalLength(cameraData.focalLength),
+    m_aperture(cameraData.aperture)
+{
+    // VIEW MATRIX INTIALIZATION
+    // cast to 3 for dots & cross
+    glm::vec3 look3{cameraData.look.x, cameraData.look.y, cameraData.look.z};
+    glm::vec3 up3{cameraData.up.x, cameraData.up.y, cameraData.up.z};
+
+    // calculate new basis
+    glm::vec3 e0 = -glm::normalize(look3);
+    glm::vec3 e1 = glm::normalize(up3 - glm::dot(up3, e0) * e0);
+    glm::vec3 e2 = glm::cross(e1, e0);
+
+    glm::mat4 alignment
+    {
+        e2.x, e1.x, e0.x, 0.f,
+        e2.y, e1.y, e0.y, 0.f,
+        e2.z, e1.z, e0.z, 0.f,
+        0.f, 0.f, 0.f, 1.f
+    };
+    glm::mat4 translation
+    {
+        1.f, 0.f, 0.f, 0.f,
+        0.f, 1.f, 0.f, 0.f,
+        0.f, 0.f, 1.f, 0.f,
+        -cameraData.pos.x, -cameraData.pos.y, -cameraData.pos.z, 1.f
+    };
+
+    m_viewMatrix = alignment * translation;
+    m_inverse = glm::inverse(m_viewMatrix);
+}
+
+
+glm::mat4 Camera::getViewMatrix() const {
+    // Optional TODO: implement the getter or make your own design
+    return m_viewMatrix;
+}
+
+glm::mat4 Camera::getInverseViewMatrix() const {
+    // Optional TODO: implement the getter or make your own design
+    return m_inverse;
+}
+
+float Camera::getAspectRatio() const {
+    // Optional TODO: implement the getter or make your own design
+    throw std::runtime_error("not implemented");
+}
+
+float Camera::getHeightAngle() const {
+    // Optional TODO: implement the getter or make your own design
+    return m_heightAngle;
+}
+
+float Camera::getFocalLength() const {
+    // Optional TODO: implement the getter or make your own design
+    return m_focalLength;
+}
+
+float Camera::getAperture() const {
+    // Optional TODO: implement the getter or make your own design
+    return m_aperture;
+}
+
+glm::vec3 Camera::getPos() const {
+    return m_pos;
+}
diff --git a/src/camera/camera.h b/src/camera/camera.h
new file mode 100644
index 0000000..e0cd013
--- /dev/null
+++ b/src/camera/camera.h
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "utils/scenedata.h"
+#include <glm/glm.hpp>
+
+// A class representing a virtual camera.
+
+// Feel free to make your own design choices for Camera class, the functions below are all optional / for your convenience.
+// You can either implement and use these getters, or make your own design.
+// If you decide to make your own design, feel free to delete these as TAs won't rely on them to grade your assignments.
+
+class Camera {
+public:
+    Camera(SceneCameraData cameraData);
+    // Returns the view matrix for the current camera settings.
+    // You might also want to define another function that return the inverse of the view matrix.
+    glm::mat4 getViewMatrix() const;
+    glm::mat4 getInverseViewMatrix() const;
+
+    // Returns the aspect ratio of the camera.
+    float getAspectRatio() const;
+
+    // Returns the height angle of the camera in RADIANS.
+    float getHeightAngle() const;
+
+    // Returns the focal length of this camera.
+    // This is for the depth of field extra-credit feature only;
+    // You can ignore if you are not attempting to implement depth of field.
+    float getFocalLength() const;
+
+    // Returns the focal length of this camera.
+    // This is for the depth of field extra-credit feature only;
+    // You can ignore if you are not attempting to implement depth of field.
+    float getAperture() const;
+
+    glm::vec3 getPos() const;
+
+    float cameraDepth = -1.f;
+
+private:
+    glm::mat4 m_viewMatrix;
+    glm::mat4 m_inverse;
+    float m_heightAngle;
+    glm::vec3 m_pos;
+
+    float m_focalLength;
+    float m_aperture;
+};
+