diff --git a/src/global/TextUtils.cpp b/src/global/TextUtils.cpp
index f7b63de9c..f95255146 100644
--- a/src/global/TextUtils.cpp
+++ b/src/global/TextUtils.cpp
@@ -6,10 +6,13 @@
 
 #include "Charset.h"
 #include "Consts.h"
+#include "RAII.h"
 #include "tests.h"
 
+#include <clocale>
 #include <cstring>
 #include <iostream>
+#include <sstream>
 
 #include <QRegularExpression>
 #include <QString>
@@ -39,6 +42,15 @@ bool isAbbrev(const std::string_view abbr, const std::string_view fullText)
 }
 
 namespace text_utils {
+
+std::string formatFloatClassic(const float val)
+{
+    std::ostringstream ss;
+    ss.imbue(std::locale::classic());
+    ss << std::showpoint << val;
+    return ss.str();
+}
+
 SplitResult<std::string_view> split_at(const std::string_view sv, const size_t pos)
 {
     assert(pos <= sv.size());
@@ -216,6 +228,23 @@ void testTrim()
     }
 }
 
+void testFormatFloatClassic()
+{
+    const char *oldLocale = std::setlocale(LC_ALL, nullptr);
+    const std::string savedLocale = oldLocale ? oldLocale : "C";
+    RAIICallback restoreLocale{[savedLocale]() { std::setlocale(LC_ALL, savedLocale.c_str()); }};
+
+    std::setlocale(LC_ALL, "de_DE.UTF-8");
+
+    const std::string radStr = text_utils::formatFloatClassic(14.0f);
+    TEST_ASSERT(radStr.find(',') == std::string::npos);
+    TEST_ASSERT(radStr.find('.') != std::string::npos);
+
+    const std::string extStr = text_utils::formatFloatClassic(28.5f);
+    TEST_ASSERT(extStr.find(',') == std::string::npos);
+    TEST_ASSERT(extStr.find('.') != std::string::npos);
+}
+
 } // namespace
 
 namespace test {
@@ -223,5 +252,6 @@ void testTextUtils()
 {
     testPrefixSuffix();
     testTrim();
+    testFormatFloatClassic();
 }
 } // namespace test
diff --git a/src/global/TextUtils.h b/src/global/TextUtils.h
index 0e680a9a1..81f1ffa37 100644
--- a/src/global/TextUtils.h
+++ b/src/global/TextUtils.h
@@ -19,6 +19,8 @@ NODISCARD extern bool isAbbrev(std::string_view abbr, std::string_view fullText)
 
 namespace text_utils {
 
+NODISCARD std::string formatFloatClassic(float val);
+
 template<typename T>
 struct NODISCARD SplitResult final
 {
diff --git a/src/opengl/legacy/ShaderUtils.cpp b/src/opengl/legacy/ShaderUtils.cpp
index 0d107e85d..0fe8ad8dd 100644
--- a/src/opengl/legacy/ShaderUtils.cpp
+++ b/src/opengl/legacy/ShaderUtils.cpp
@@ -224,15 +224,19 @@ NODISCARD static GLuint compileShader(Functions &gl, const GLenum type, const So
     std::string defineNamedColors = "#define MAX_NAMED_COLORS " + std::to_string(MAX_NAMED_COLORS)
                                     + "\n";
     std::string defineWeatherRadius = "#define WEATHER_RADIUS "
-                                      + std::to_string(WeatherConstants::WEATHER_RADIUS) + "\n";
+                                      + text_utils::formatFloatClassic(
+                                          WeatherConstants::WEATHER_RADIUS)
+                                      + "\n";
     std::string defineWeatherExtent = "#define WEATHER_EXTENT "
-                                      + std::to_string(WeatherConstants::WEATHER_EXTENT) + "\n";
+                                      + text_utils::formatFloatClassic(
+                                          WeatherConstants::WEATHER_EXTENT)
+                                      + "\n";
     std::string defineWeatherMaskOuter = "#define WEATHER_MASK_RADIUS_OUTER "
-                                         + std::to_string(
+                                         + text_utils::formatFloatClassic(
                                              WeatherConstants::WEATHER_MASK_RADIUS_OUTER)
                                          + "\n";
     std::string defineWeatherMaskInner = "#define WEATHER_MASK_RADIUS_INNER "
-                                         + std::to_string(
+                                         + text_utils::formatFloatClassic(
                                              WeatherConstants::WEATHER_MASK_RADIUS_INNER)
                                          + "\n";
 
diff --git a/src/resources/shaders/legacy/room/tex/acolor/vert.glsl b/src/resources/shaders/legacy/room/tex/acolor/vert.glsl
index 2bbeb02f5..34a79167d 100644
--- a/src/resources/shaders/legacy/room/tex/acolor/vert.glsl
+++ b/src/resources/shaders/legacy/room/tex/acolor/vert.glsl
@@ -20,14 +20,14 @@ void main()
     //  | /|  Triangles 012 and 023 both use CCW order.
     //  |/ |  Notice that the four vertices are in CCW order.
     //  0--1
-    const ivec3[4] ioffsets = ivec3[4](ivec3(0, 0, 0), ivec3(1, 0, 0), ivec3(1, 1, 0), ivec3(0, 1, 0)); // fan
+    const ivec3 ioffsets[4] = ivec3[4](ivec3(0, 0, 0), ivec3(1, 0, 0), ivec3(1, 1, 0), ivec3(0, 1, 0)); // fan
 #else
     // GL_TRIANGLE_STRIP
     //  2--3  Note: Triangle strips alternate CCW/CW winding on every other triangle. This means...
     //  |\ |    triangle 012 is CCW order, but triangle 123 is CW order (backwards).
     //  | \|  Keep in mind that OpenGL does not actually draw the triangle backwards,
     //  0--1    so it does not affect glFrontFace() or the gl_FrontFacing variable.
-    const ivec3[4] ioffsets = ivec3[4](ivec3(0, 0, 0), ivec3(1, 0, 0), ivec3(0, 1, 0), ivec3(1, 1, 0)); // strip
+    const ivec3 ioffsets[4] = ivec3[4](ivec3(0, 0, 0), ivec3(1, 0, 0), ivec3(0, 1, 0), ivec3(1, 1, 0)); // strip
 #endif
     ivec3 ioffset = ioffsets[gl_VertexID];