From 4a6a25a081b841a80fc9cf1f7e3b8f1a7f500d35 Mon Sep 17 00:00:00 2001
From: Andras Schmelczer <andras@schmelczer.dev>
Date: Wed, 10 Jun 2026 21:36:52 +0100
Subject: [PATCH] Fix compiling edge-cases

---
 .../graphics-library/parallel-compiler.ts      | 18 +++++++++++-------
 src/helper/number-to-glsl-float.ts             | 12 ++++++++++--
 2 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/src/graphics/graphics-library/parallel-compiler.ts b/src/graphics/graphics-library/parallel-compiler.ts
index bb170cb..714c423 100644
--- a/src/graphics/graphics-library/parallel-compiler.ts
+++ b/src/graphics/graphics-library/parallel-compiler.ts
@@ -79,11 +79,16 @@ export class ParallelCompiler {
     let replaceHappened: boolean;
     do {
       replaceHappened = false;
-      processedSource = processedSource.replace(/{(.+)}/gm, (_, name: string): string => {
-        replaceHappened = true;
-        const value = substitutions[name];
-        return numberToGlslFloat(value);
-      });
+      processedSource = processedSource.replace(
+        /{(\w+)}/gm,
+        (_, name: string): string => {
+          replaceHappened = true;
+          if (!(name in substitutions)) {
+            throw new Error(`Unknown shader substitution: '{${name}}'`);
+          }
+          return numberToGlslFloat(substitutions[name]);
+        }
+      );
     } while (replaceHappened);
 
     const shader = this.gl.createShader(type)!;
@@ -142,8 +147,7 @@ export class ParallelCompiler {
         console.error(
           formatLog(
             'parallel-compiler',
-            `Error: ${error}\nSource (line ${line}):\n${
-              shader.source.split('\n')[line - 1]
+            `Error: ${error}\nSource (line ${line}):\n${shader.source.split('\n')[line - 1]
             }`
           )
         );
diff --git a/src/helper/number-to-glsl-float.ts b/src/helper/number-to-glsl-float.ts
index 8f2ec3d..5495c0f 100644
--- a/src/helper/number-to-glsl-float.ts
+++ b/src/helper/number-to-glsl-float.ts
@@ -3,5 +3,13 @@
  *
  * Returns non-numbers as is.
  */
-export const numberToGlslFloat = (value: number | string): string =>
-  Number.isInteger(value) ? `${value}.0` : value.toString();
+export const numberToGlslFloat = (value: number | string): string => {
+  if (typeof value !== 'number') {
+    return String(value);
+  }
+
+  const asString = value.toString();
+
+  // Very large integers stringify in exponent notation (1e21)
+  return Number.isInteger(value) && !asString.includes('e') ? `${asString}.0` : asString;
+};