From 55487832c614edb61ebf22d0c153944ba864feaa Mon Sep 17 00:00:00 2001
From: mrb0nk500 <b0nk@b0nk.xyz>
Date: Thu, 2 Feb 2023 11:30:25 -0400
Subject: sdk: Add `mtx`

We're slowly getting there.
---
 src/Dolphin/mtx/mtx44.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 src/Dolphin/mtx/mtx44.c

(limited to 'src/Dolphin/mtx/mtx44.c')

diff --git a/src/Dolphin/mtx/mtx44.c b/src/Dolphin/mtx/mtx44.c
new file mode 100644
index 0000000..b974888
--- /dev/null
+++ b/src/Dolphin/mtx/mtx44.c
@@ -0,0 +1,98 @@
+// This file was taken from the Melee decompilation project.
+// https://github.com/doldecomp/melee/blob/master/src/dolphin/mtx/mtx44.c
+#include <mtx.h>
+#include <math.h>
+
+void C_MTXFrustum(Mtx44 m, f32 t, f32 b, f32 l, f32 r, f32 n, f32 f)
+{
+    f32 temp_f8;
+    f32 temp_f6;
+    f32 temp_f9;
+    f32 temp_f11;
+
+    temp_f11 = 1.0F / (r - l);
+    temp_f8 = 2.0F * n;
+    temp_f9 = 1.0F / (t - b);
+    temp_f6 = 1.0F / (f - n);
+
+    m[0][0] = temp_f8 * temp_f11;
+    m[0][1] = 0.0F;
+    m[0][2] = temp_f11 * (r + l);
+    m[0][3] = 0.0F;
+
+    m[1][0] = 0.0F;
+    m[1][1] = temp_f8 * temp_f9;
+    m[1][2] = temp_f9 * (t + b);
+    m[1][3] = 0.0F;
+
+    m[2][0] = 0.0F;
+    m[2][1] = 0.0F;
+    m[2][2] = -n * temp_f6;
+    m[2][3] = temp_f6 * -(f * n);
+
+    m[3][0] = 0.0F;
+    m[3][1] = 0.0F;
+    m[3][2] = -1.0F;
+    m[3][3] = 0.0F;
+}
+
+void C_MTXPerspective(Mtx44 m, f32 fovY, f32 aspect, f32 n, f32 f)
+{
+    f32 temp_f3;
+    f32 temp_f4;
+
+    fovY = 0.5F * fovY;
+
+    temp_f4 = 1.0F / tanf(0.017453292F * (fovY));
+    temp_f3 = 1.0F / (f - n);
+
+    m[0][0] = temp_f4 / aspect;
+    m[0][1] = 0.0F;
+    m[0][2] = 0.0F;
+    m[0][3] = 0.0F;
+
+    m[1][0] = 0.0F;
+    m[1][1] = temp_f4;
+    m[1][2] = 0.0F;
+    m[1][3] = 0.0F;
+
+    m[2][0] = 0.0F;
+    m[2][1] = 0.0F;
+    m[2][2] = -n * temp_f3;
+    m[2][3] = temp_f3 * -(f * n);
+
+    m[3][0] = 0.0F;
+    m[3][1] = 0.0F;
+    m[3][2] = -1.0F;
+    m[3][3] = 0.0F;
+}
+
+void C_MTXOrtho(Mtx44 m, f32 t, f32 b, f32 l, f32 r, f32 n, f32 f)
+{
+    f32 temp_f8;
+    f32 temp_f10;
+    f32 temp_f4;
+
+    temp_f10 = 1.0F / (r - l);
+    m[0][0] = 2.0F * temp_f10;
+    m[0][1] = 0.0F;
+    m[0][2] = 0.0F;
+    m[0][3] = temp_f10 * -(r + l);
+
+    temp_f8 = 1.0F / (t - b);
+    m[1][0] = 0.0F;
+    m[1][1] = 2.0F * temp_f8;
+    m[1][2] = 0.0F;
+    m[1][3] = temp_f8 * -(t + b);
+
+    temp_f4 = 1.0F / (f - n);
+    m[2][0] = 0.0F;
+    m[2][1] = 0.0F;
+    m[2][2] = -1.0F * temp_f4;
+    m[2][3] = -f * temp_f4;
+
+    m[3][0] = 0.0F;
+    m[3][1] = 0.0F;
+    m[3][2] = 0.0F;
+    m[3][3] = 1.0F;
+}
-- 
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