From f63febed2a769d0c55192e192a20b8e39f162932 Mon Sep 17 00:00:00 2001
From: vimene <vincent.menegaux@gmail.com>
Date: Sun, 26 Nov 2023 06:49:51 +0100
Subject: improved matrices, cube building and command parsing

---
 src/math/mat4.cpp | 39 +++++++++++++++++++++++++++++++++++++++
 src/math/mat4.h   |  6 ++++++
 2 files changed, 45 insertions(+)

(limited to 'src/math')

diff --git a/src/math/mat4.cpp b/src/math/mat4.cpp
index 0342fdf..ece42d8 100644
--- a/src/math/mat4.cpp
+++ b/src/math/mat4.cpp
@@ -12,6 +12,23 @@ Mat4 Mat4::idty() {
     };
 }
 
+Mat4 Mat4::translate(MathVector3 v) {
+    return {
+        1.f, 0.f, 0.f, v.x,
+        0.f, 1.f, 0.f, v.y,
+        0.f, 0.f, 1.f, v.z,
+        0.f, 0.f, 0.f, 1.f,
+    };
+}
+Mat4 Mat4::scale(float fac) {
+    return {
+        fac, 0.f, 0.f, 0.f,
+        0.f, fac, 0.f, 0.f,
+        0.f, 0.f, fac, 0.f,
+        0.f, 0.f, 0.f, 1.f,
+    };
+}
+
 Mat4 Mat4::rot_x(float a) {
     float c = std::cos(a);
     float s = std::sin(a);
@@ -45,6 +62,19 @@ Mat4 Mat4::rot_z(float a) {
     };
 }
 
+Mat4 Mat4::projection(float aspect_ratio, float min_z, float max_z) {
+    return {{
+        aspect_ratio, 0.f, 0.f, 0.f,
+        0.f, -1.f, 0.f, 0.f,
+        0.f, 0.f, -2.f / (max_z - min_z), -(max_z + min_z) / (max_z - min_z),
+        0.f, 0.f, -1.f, 0.f,
+    }};
+}
+
+Mat4 Mat4::operator+() {
+    return *this;
+}
+
 Mat4 Mat4::operator-() {
     return {
         -values[ 0], -values[ 1], -values[ 2], -values[ 3],
@@ -96,3 +126,12 @@ std::array<MathVector4, 4> Mat4::to_vecs() {
         { values[ 3], values[ 7], values[11], values[15] },
     }};
 }
+
+Mat4 operator*(float fac, Mat4 m) {
+    return {
+        fac * m.values[ 0], fac * m.values[ 1], fac * m.values[ 2], fac * m.values[ 3],
+        fac * m.values[ 4], fac * m.values[ 5], fac * m.values[ 6], fac * m.values[ 7],
+        fac * m.values[ 8], fac * m.values[ 9], fac * m.values[10], fac * m.values[11],
+        fac * m.values[12], fac * m.values[13], fac * m.values[14], fac * m.values[15],
+    };
+}
diff --git a/src/math/mat4.h b/src/math/mat4.h
index d81da63..6df9d49 100644
--- a/src/math/mat4.h
+++ b/src/math/mat4.h
@@ -7,12 +7,16 @@
 class Mat4 {
     public:
         static Mat4 idty();
+        static Mat4 translate(MathVector3 v);
+        static Mat4 scale(float fac);
         static Mat4 rot_x(float a);
         static Mat4 rot_y(float a);
         static Mat4 rot_z(float a);
+        static Mat4 projection(float aspect_ratio, float min_z, float max_z);
 
         std::array<float, 16> values;
 
+        Mat4 operator+();
         Mat4 operator-();
         Mat4 operator+(Mat4 m);
         Mat4 operator-(Mat4 m);
@@ -21,4 +25,6 @@ class Mat4 {
         std::array<MathVector4, 4> to_vecs();
 };
 
+Mat4 operator*(float fac, Mat4 m);
+
 #endif // MATH_MAT4_H
-- 
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