From 770e3a8c4a3885fa6f802f97c1ad0283d2724cfa Mon Sep 17 00:00:00 2001
From: David Chavez <david@dcvz.io>
Date: Wed, 6 Jul 2022 05:53:42 +0200
Subject: [PATCH] Fix portability use of std::clamp (#596)

---
 libultraship/Lib/Fast3D/gfx_pc.cpp | 7 ++++---
 libultraship/Utils.cpp             | 7 +++++++
 libultraship/Utils.h               | 6 +++++-
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/libultraship/Lib/Fast3D/gfx_pc.cpp b/libultraship/Lib/Fast3D/gfx_pc.cpp
index ba60c1f1b4d..b53c2550f39 100644
--- a/libultraship/Lib/Fast3D/gfx_pc.cpp
+++ b/libultraship/Lib/Fast3D/gfx_pc.cpp
@@ -33,6 +33,7 @@
 #include "../../Environment.h"
 #include "../../GameVersions.h"
 #include "../../ResourceMgr.h"
+#include "../../Utils.h"
 
 // OTRTODO: fix header files for these
 extern "C" {
@@ -1062,8 +1063,8 @@ static void gfx_sp_vertex(size_t n_vertices, size_t dest_index, const Vtx *verti
                 dotx /= 127.0f;
                 doty /= 127.0f;
 
-                std::clamp(dotx, -1.0f, 1.0f);
-                std::clamp(doty, -1.0f, 1.0f);
+                dotx = math::clamp(dotx, -1.0f, 1.0f);
+                doty = math::clamp(doty, -1.0f, 1.0f);
 
                 if (rsp.geometry_mode & G_TEXTURE_GEN_LINEAR) {
                                     // Not sure exactly what formula we should use to get accurate values
@@ -1115,7 +1116,7 @@ static void gfx_sp_vertex(size_t n_vertices, size_t dest_index, const Vtx *verti
             if (winv < 0.0f) winv = std::numeric_limits<int16_t>::max();
 
             float fog_z = z * winv * rsp.fog_mul + rsp.fog_offset;
-            std::clamp(fog_z, 0.0f, 255.0f);
+            fog_z = math::clamp(fog_z, 0.0f, 255.0f);
             d->color.a = fog_z; // Use alpha variable to store fog factor
         } else {
             d->color.a = v->cn[3];
diff --git a/libultraship/Utils.cpp b/libultraship/Utils.cpp
index d54952c7784..2b813aee7d7 100644
--- a/libultraship/Utils.cpp
+++ b/libultraship/Utils.cpp
@@ -5,6 +5,13 @@
 #define strdup _strdup
 #endif
 
+namespace math {
+	float clamp(float d, float min, float max) {
+		const float t = d < min ? min : d;
+		return t > max ? max : t;
+	}
+}
+
 namespace Utils {
 	std::vector<std::string> SplitText(const std::string text, char separator = ' ', bool keep_quotes = false) {
 		std::vector<std::string> args;
diff --git a/libultraship/Utils.h b/libultraship/Utils.h
index 32ceb6e6dfc..25c6dd64b4c 100644
--- a/libultraship/Utils.h
+++ b/libultraship/Utils.h
@@ -3,6 +3,10 @@
 #include <string>
 #include <vector>
 
+namespace math {
+	float clamp(float d, float min, float max);
+}
+
 namespace Utils {
-    std::vector<std::string> SplitText(const std::string& text, char separator, bool keep_quotes);
+	std::vector<std::string> SplitText(const std::string& text, char separator, bool keep_quotes);
 }