Stop the glass shader importing what older versions lack

1.21.4 and 1.21.5 read every shader's imports while loading resources,
and dynamictransforms.glsl only exists from 1.21.6, so resources failed
to load there. The glass shader declares the transforms block itself
again, with LineWidth behind a define the pipeline sets before 1.21.11.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/main/java/org/saturnclient/impl/ui/GlassRenderer.java

@@ -48,6 +48,9 @@ public final class GlassRenderer {
             .withLocation(Identifier.of("saturnclient", "pipeline/glass"))
             .withFragmentShader(Identifier.of("saturnclient", "core/glass"))
             .withSampler("Sampler1")
+            // The transforms block ends with LineWidth before 1.21.11 (see glass.fsh).
+            //? if <1.21.11
+            //.withShaderDefine("HAS_LINE_WIDTH")
             .build();
 
     private static final Identifier BLUR = Identifier.ofVanilla("post_effect/blur.json");

src/main/resources/assets/saturnclient/shaders/core/glass.fsh

@@ -3,8 +3,18 @@
 // Saturn's glass: the blurred game behind the screen, cut to a panel's shape. For 1.21.6 and
 // later; glass_pre_1_21_6.fsh (with glass.json, the program 1.21.4 loads) is for older versions.
 
-// Vanilla's own, since its layout changes between versions (1.21.11 dropped LineWidth)
+// Vanilla's transforms, laid out as the version has them: 1.21.6 to 1.21.10 end with LineWidth, which
-#moj_import <minecraft:dynamictransforms.glsl>
+// 1.21.11 dropped (GlassRenderer defines HAS_LINE_WIDTH there). Not imported: the include only exists
+// from 1.21.6, and 1.21.4 and 1.21.5 still read every shader's imports while loading resources.
+layout(std140) uniform DynamicTransforms {
+    mat4 ModelViewMat;
+    vec4 ColorModulator;
+    vec3 ModelOffset;
+    mat4 TextureMat;
+#ifdef HAS_LINE_WIDTH
+    float LineWidth;
+#endif
+};
 
 // The panel's rounded rectangle, the same texture its background is drawn with
 uniform sampler2D Sampler0;