From fdd800afa864a4a9ef72d09d003f31910b380ab2 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 7 Mar 2026 05:57:56 +0000
Subject: [PATCH 1/2] Initial plan


From 13661e801b4965b0be4feab8f544a6d6ded30e54 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 7 Mar 2026 06:04:58 +0000
Subject: [PATCH 2/2] Add GLSL code formatting after preprocessing in demo

Co-authored-by: 06wj <800043+06wj@users.noreply.github.com>
---
 demo/app.bundle.js   |   2 +-
 demo/app.ts          |   3 +-
 demo/index.html      |   1 +
 lib/glslFormatter.js | 197 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 201 insertions(+), 2 deletions(-)
 create mode 100644 lib/glslFormatter.js

diff --git a/demo/app.bundle.js b/demo/app.bundle.js
index 830acb6..653cda1 100644
--- a/demo/app.bundle.js
+++ b/demo/app.bundle.js
@@ -1 +1 @@
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e=this;this.codeElem.oninput=function(){e.show()}}}).init()}])}));
\ No newline at end of file
diff --git a/demo/app.ts b/demo/app.ts
index d9524e5..f138e3c 100644
--- a/demo/app.ts
+++ b/demo/app.ts
@@ -1,6 +1,7 @@
 import compiler from '../src/compiler';
 
 declare const Prism: any;
+declare const formatGLSL: (code: string) => string;
 
 interface App {
     codeElem: HTMLTextAreaElement;
@@ -24,7 +25,7 @@ const app: App = {
             if (error) {
                 this.viewElem.textContent = `Error: ${error}`;
             } else {
-                this.viewElem.textContent = code || '';
+                this.viewElem.textContent = formatGLSL(code || '');
             }
             Prism.highlightElement(this.viewElem);
         }, options);
diff --git a/demo/index.html b/demo/index.html
index b54b734..f48fbde 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -503,6 +503,7 @@
         </pre>
     </div>
     <script src='../lib/prism.js'></script>
+    <script src='../lib/glslFormatter.js'></script>
     <script src='./app.bundle.js'></script>
 </body>
 </html>
\ No newline at end of file
diff --git a/lib/glslFormatter.js b/lib/glslFormatter.js
new file mode 100644
index 0000000..bf4a116
--- /dev/null
+++ b/lib/glslFormatter.js
@@ -0,0 +1,197 @@
+/**
+ * Simple GLSL code formatter / beautifier.
+ * Formats preprocessed GLSL shader code with consistent indentation.
+ */
+(function (root, factory) {
+    if (typeof module === 'object' && module.exports) {
+        module.exports = factory();
+    } else {
+        root.formatGLSL = factory();
+    }
+}(typeof self !== 'undefined' ? self : this, function () {
+
+    /**
+     * Format GLSL source code with proper indentation and line breaks.
+     * @param {string} code - The GLSL source code to format.
+     * @returns {string} The formatted GLSL source code.
+     */
+    function formatGLSL(code) {
+        if (!code) return code;
+
+        var INDENT = '    ';
+
+        var tokens = tokenize(code);
+        var lines = [];
+        var indentLevel = 0;
+        var currentLine = '';
+
+        function getIndent() {
+            return INDENT.repeat(indentLevel);
+        }
+
+        function flushLine() {
+            var trimmed = currentLine.trim();
+            if (trimmed) {
+                lines.push(getIndent() + trimmed);
+            }
+            currentLine = '';
+        }
+
+        for (var i = 0; i < tokens.length; i++) {
+            var tok = tokens[i];
+
+            if (tok.type === 'directive') {
+                flushLine();
+                lines.push(tok.value);
+
+            } else if (tok.type === 'line_comment') {
+                flushLine();
+                lines.push(getIndent() + tok.value);
+
+            } else if (tok.type === 'block_comment') {
+                flushLine();
+                // Preserve block comment lines, re-indenting each line
+                var commentLines = tok.value.split('\n');
+                var baseIndent = getIndent();
+                for (var c = 0; c < commentLines.length; c++) {
+                    lines.push(baseIndent + commentLines[c].trim());
+                }
+
+            } else if (tok.type === 'open_brace') {
+                if (currentLine.trim()) {
+                    lines.push(getIndent() + currentLine.trim() + ' {');
+                } else {
+                    lines.push(getIndent() + '{');
+                }
+                currentLine = '';
+                indentLevel++;
+
+            } else if (tok.type === 'close_brace') {
+                flushLine();
+                indentLevel = Math.max(0, indentLevel - 1);
+                lines.push(getIndent() + '}');
+
+            } else if (tok.type === 'semicolon') {
+                lines.push(getIndent() + currentLine.trim() + ';');
+                currentLine = '';
+
+            } else {
+                // Regular code token
+                if (currentLine) {
+                    currentLine += ' ' + tok.value;
+                } else {
+                    currentLine = tok.value;
+                }
+            }
+        }
+
+        flushLine();
+
+        // Remove leading/trailing blank lines, then collapse multiple blank lines
+        var result = lines.join('\n')
+            .replace(/\n{3,}/g, '\n\n')
+            .trim();
+
+        return result;
+    }
+
+    /**
+     * Tokenize GLSL source code into a sequence of typed tokens.
+     * @param {string} code
+     * @returns {Array<{type: string, value: string}>}
+     */
+    function tokenize(code) {
+        var tokens = [];
+        var pos = 0;
+        var len = code.length;
+
+        while (pos < len) {
+            var ch = code[pos];
+            var next = pos + 1 < len ? code[pos + 1] : '';
+
+            // Whitespace (skip, but preserve as separator)
+            if (ch === ' ' || ch === '\t' || ch === '\r') {
+                pos++;
+                continue;
+            }
+
+            if (ch === '\n') {
+                pos++;
+                continue;
+            }
+
+            // Line comment
+            if (ch === '/' && next === '/') {
+                var end = code.indexOf('\n', pos);
+                if (end === -1) end = len;
+                tokens.push({ type: 'line_comment', value: code.slice(pos, end) });
+                pos = end;
+                continue;
+            }
+
+            // Block comment
+            if (ch === '/' && next === '*') {
+                var end2 = code.indexOf('*/', pos + 2);
+                if (end2 === -1) end2 = len - 2;
+                tokens.push({ type: 'block_comment', value: code.slice(pos, end2 + 2) });
+                pos = end2 + 2;
+                continue;
+            }
+
+            // Preprocessor directive
+            if (ch === '#') {
+                var end3 = pos;
+                while (end3 < len) {
+                    if (code[end3] === '\\' && end3 + 1 < len && code[end3 + 1] === '\n') {
+                        end3 += 2; // line continuation
+                    } else if (code[end3] === '\n') {
+                        break;
+                    } else {
+                        end3++;
+                    }
+                }
+                tokens.push({ type: 'directive', value: code.slice(pos, end3).trim() });
+                pos = end3;
+                continue;
+            }
+
+            if (ch === '{') {
+                tokens.push({ type: 'open_brace', value: '{' });
+                pos++;
+                continue;
+            }
+
+            if (ch === '}') {
+                tokens.push({ type: 'close_brace', value: '}' });
+                pos++;
+                continue;
+            }
+
+            if (ch === ';') {
+                tokens.push({ type: 'semicolon', value: ';' });
+                pos++;
+                continue;
+            }
+
+            // Gather remaining characters until a delimiter
+            var t = '';
+            while (pos < len) {
+                var c = code[pos];
+                if (c === '{' || c === '}' || c === ';' || c === '\n' || c === '\r' ||
+                    (c === '/' && pos + 1 < len && (code[pos + 1] === '/' || code[pos + 1] === '*')) ||
+                    c === '#') {
+                    break;
+                }
+                t += c;
+                pos++;
+            }
+            if (t.trim()) {
+                tokens.push({ type: 'token', value: t.trim() });
+            }
+        }
+
+        return tokens;
+    }
+
+    return formatGLSL;
+}));