From f02aabd4db7232f927622b87ea885491e6651b44 Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Wed, 3 Feb 2021 14:23:14 +0100
Subject: Work on camera implementation using Transformations

Not sure if this is really neccesary, will take that later, now it is
saved on this commit.

The reason it ditched it is that it requires the ability to inverse
matrixes, which is really complicated
---
 src/core/matrix4x4.rs | 31 +++++++++++++++++++++++++++++++
 src/core/transform.rs | 17 +++++++++++++++++
 2 files changed, 48 insertions(+)

(limited to 'src/core')

diff --git a/src/core/matrix4x4.rs b/src/core/matrix4x4.rs
index 521d7ab..f8c685d 100644
--- a/src/core/matrix4x4.rs
+++ b/src/core/matrix4x4.rs
@@ -1,4 +1,5 @@
 use crate::{Number, Float};
+use std::ops;
 
 pub struct Matrix4x4<T: Number> {
     pub m: [[T; 4]; 4],
@@ -20,6 +21,36 @@ impl<T: Number> Matrix4x4<T> {
             ],
         }
     }
+
+    pub fn initial(initial: T) -> Self {
+        Self {
+            m : [ [initial; 4]; 4]
+        }
+    }
+
+    pub fn inverse(&self) -> Self {
+
+    }
+}
+
+impl<T: Number> ops::Mul for &Matrix4x4<T> {
+    type Output = Matrix4x4<T>;
+
+    fn mul(self, op: Self) -> Self::Output {
+        let mut res = Self::Output::initial(Default::default());
+
+        // Not very fast
+        for i in 0..4 {
+            for j in 0..4 {
+                res.m[i][j] = self.m[i][0] * op.m[0][j] +
+                    self.m[i][1] * op.m[1][j] +
+                    self.m[i][2] * op.m[2][j] +
+                    self.m[i][3] * op.m[3][j];
+            }
+        }
+
+        res
+    }
 }
 
 impl Matrix4x4f {
diff --git a/src/core/transform.rs b/src/core/transform.rs
index f64710c..337d9b1 100644
--- a/src/core/transform.rs
+++ b/src/core/transform.rs
@@ -17,6 +17,7 @@
 use super::matrix4x4::Matrix4x4f;
 use crate::Float;
 use crate::core::Vector3f;
+use std::ops;
 
 pub struct Transform {
     m: Matrix4x4f,
@@ -56,6 +57,22 @@ impl Transform {
 
         Vector3f::new_xyz(x, y, z)
     }
+
+    pub fn inverse(&self) -> Self {
+        Transform {
+            m: self.m.inverse(),
+        }
+    }
+}
+
+impl ops::Mul for Transform {
+    type Output = Transform;
+
+    fn mul(self, op: Self) -> Self::Output {
+        Transform {
+            m: &self.m * &op.m
+        }
+    }
 }
 
 // Creation of different transformations
-- 
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