[docs, tools] Add 3rd party links, debug and testing guidelines; add extra tools for maintaining strings, rewrite lanczos generator in perl (#2749)

RenderDoc checklist inspired by writeup of Charles G. of LunarG
Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2749
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

1 files changed, 40 insertions, 0 deletions

diff --git a/tools/lanczos-gen.pl b/tools/lanczos-gen.pl
new file mode 100644
index 0000000000..2e26c8c6b9
--- /dev/null
+++ b/tools/lanczos-gen.pl
@@ -0,0 +1,40 @@
+#!/usr/bin/perl
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+use strict;
+use warnings;
+sub generate_lanczos {
+    my $pi = 3.14159265358979;
+    sub sinc {
+        if ($_[0] eq 0.0) {
+            return 1.0;
+        } else {
+            return sin($pi * $_[0]) / ($pi * $_[0]);
+        }
+    }
+    sub lanczos {
+        my $d = sqrt($_[0] * $_[0] + $_[1] * $_[1]);
+        return sinc($d) / sinc($d / $_[2]);
+    }
+    my $r = 3.0; #radius (1 = 3 steps)
+    my $k_size = ($r * 2.0 + 1.0) * ($r * 2.0 + 1.0);
+    my $w_sum = \0.0;
+    my $factor = 1.0 / ($r + 1.0);
+    #kernel size = (r * 2 + 1) ^ 2
+    printf("const float w_kernel[%i] = float[] (\n    ", $k_size);
+    for (my $x = -$r; $x <= $r; $x++) {
+        for (my $y = -$r; $y <= $r; $y++) {
+            my $w = lanczos($x, $y, $r);
+            printf("%f, ", $w);
+            $w_sum += $w;
+        }
+    }
+    printf("\n);\nconst vec2 w_pos[%i] = vec[](\n    ", $k_size);
+    for (my $x = -$r; $x <= $r; $x++) {
+        for (my $y = -$r; $y <= $r; $y++) {
+            printf("vec2(%f, %f), ", $x * $factor, $y * $factor);
+        }
+    }
+    printf("\n);\nconst float w_sum = %f;\n", $w_sum);
+}
+generate_lanczos;