Skybox image: recognise Sky_HDR_DX9 as the HDR sky shader

The material reports shader "Sky_HDR_DX9", not "sky", so the linear/alpha
compensation was never applied and the raw sRGB image was scaled by the HDR
decode's 8x. Match the Sky_HDR prefix so the compensation path is used.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/world.cpp b/src/world.cpp
index ddd047a..03b30a8 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -872,7 +872,11 @@ bool sky_uses_hdr_shader() {
     if (!is_sky_material(name, group))
       continue;
     const char *shader = vfunc<ShaderFn>(mat, 49)(mat);
-    if (shader && strcmp(shader, "sky") == 0)
+    // The shipped shader is registered as "Sky_HDR_DX9" (older SDK name
+    // "sky"); match both and stay case-insensitive about the prefix.
+    if (shader && (strstr(shader, "Sky_HDR") != nullptr ||
+                   strstr(shader, "sky_hdr") != nullptr ||
+                   strcmp(shader, "sky") == 0))
       return true;
   }
   return false;