From 29c5fe91d99eacc05716067042fa255fa3248c3f Mon Sep 17 00:00:00 2001
From: vonhyou <moi@rfung.dev>
Date: Mon, 19 Feb 2024 01:47:35 -0500
Subject: [PATCH] impl ray casted render

---
 src/Geometry.cc  |  4 ++--
 src/Geometry.h   |  8 +++++---
 src/RayTracer.cc | 25 +++++++++++++++++++++++++
 src/Scene.cc     |  8 ++++++++
 src/Scene.h      |  4 ++++
 5 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/src/Geometry.cc b/src/Geometry.cc
index 9eb69f5..379ecaa 100644
--- a/src/Geometry.cc
+++ b/src/Geometry.cc
@@ -4,6 +4,6 @@ void Geometry::setTransform(const Matrix4f &transform) {
   this->transform = transform;
 }
 
-bool Sphere::intersect() const { return false; }
+bool Sphere::intersect(const Ray &r) const { return false; }
 
-bool Rectangle::intersect() const { return false; }
+bool Rectangle::intersect(const Ray &r) const { return false; }
diff --git a/src/Geometry.h b/src/Geometry.h
index b262b11..7889796 100644
--- a/src/Geometry.h
+++ b/src/Geometry.h
@@ -1,6 +1,8 @@
 #ifndef GEOMETRY_H_
 #define GEOMETRY_H_
 
+#include "Ray.h"
+
 #include <Eigen/Core>
 
 using Eigen::Matrix;
@@ -13,7 +15,7 @@ public:
   enum class Type { SPHERE, RECTANGLE };
 
   virtual ~Geometry() = default;
-  virtual bool intersect() const = 0;
+  virtual bool intersect(const Ray &) const = 0;
 
 protected:
   Geometry(Type type, float ka, float kd, float ks, const Vector3f &ca,
@@ -37,7 +39,7 @@ public:
       : Geometry(Type::SPHERE, ka, kd, ks, ca, cd, cs, pc), radius(radius),
         center(center) {}
 
-  bool intersect() const override;
+  bool intersect(const Ray &) const override;
 
 private:
   float radius;
@@ -51,7 +53,7 @@ public:
       : Geometry(Type::RECTANGLE, ka, kd, ks, ca, cd, cs, pc),
         corners(corners) {}
 
-  bool intersect() const override;
+  bool intersect(const Ray &) const override;
 
 private:
   Matrix<float, 3, 4> corners;
diff --git a/src/RayTracer.cc b/src/RayTracer.cc
index a2a0eb3..0515d1a 100644
--- a/src/RayTracer.cc
+++ b/src/RayTracer.cc
@@ -1,6 +1,7 @@
 #include "RayTracer.h"
 #include "../external/simpleppm.h"
 #include "Parser.h"
+#include "Ray.h"
 
 void RayTracer::parse() {
   for (auto i = json["output"].begin(); i != json["output"].end(); ++i)
@@ -13,10 +14,34 @@ void RayTracer::parse() {
     lights.push_back(Parser::getLight(*i));
 }
 
+Ray getRay(int x, int y, const Vector3f &camPos, const Vector3f &lookat,
+           float fov, int width, int height) {
+  // TODO: compute ray
+  return Ray(Vector3f(), Vector3f());
+}
+
 void RayTracer::render(Scene *scene) {
   int width = scene->getWidth();
   int height = scene->getHeight();
+  float fov = scene->getFov();
+  Vector3f cameraPos = scene->getCenter();
+  Vector3f lookAt = scene->getLookAt();
+  Vector3f up = scene->getUpVector();
+
   Buffer buffer(width * height * 3);
+  for (int y = 0; y < height; ++y)
+    for (int x = 0; x < width; ++x) {
+      Ray ray = getRay(x, y, cameraPos, lookAt, fov, width, height);
+
+      for (auto geometry : geometries)
+        if (geometry->intersect(ray)) {
+          buffer[3 * y * width + 3 * x + 0] = 1;
+          buffer[3 * y * width + 3 * x + 1] = 1;
+          buffer[3 * y * width + 3 * x + 2] = 1;
+          break;
+        }
+    }
+
   Task *task = new Task(scene, buffer);
   tasks.push_back(task);
 }
diff --git a/src/Scene.cc b/src/Scene.cc
index 5cf2980..8533ff3 100644
--- a/src/Scene.cc
+++ b/src/Scene.cc
@@ -6,6 +6,14 @@ int Scene::getWidth() { return width; }
 
 int Scene::getHeight() { return height; }
 
+float Scene::getFov() { return fov; }
+
+Vector3f Scene::getCenter() const { return center; }
+
+Vector3f Scene::getUpVector() const { return up; }
+
+Vector3f Scene::getLookAt() const { return lookAt; }
+
 void Scene::setRaysPerPixel(const Eigen::VectorXi &raysPerPixel) {
   this->raysPerPixel = raysPerPixel;
 }
diff --git a/src/Scene.h b/src/Scene.h
index b1a15b5..24a697e 100644
--- a/src/Scene.h
+++ b/src/Scene.h
@@ -35,6 +35,10 @@ public:
   string getName() const;
   int getWidth();
   int getHeight();
+  float getFov();
+  Vector3f getCenter() const;
+  Vector3f getUpVector() const;
+  Vector3f getLookAt() const;
   void setRaysPerPixel(const Eigen::VectorXi &);
   void setAntialiasing(bool);
   void setTwoSideRender(bool);