From ae3fa0f2e668d3ce274a247518b3b9acbc34f3e8 Mon Sep 17 00:00:00 2001
From: Zack Buhman <zack@buhman.org>
Date: Tue, 21 Oct 2025 15:39:08 -0500
Subject: [PATCH] assembler/lexer: add support for double hypen comments

---
 drm/shadertoy_circle.fs.asm | 16 ++++++++--------
 regs/assembler/lexer.py     |  4 ++++
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drm/shadertoy_circle.fs.asm b/drm/shadertoy_circle.fs.asm
index 68324ac..0211224 100644
--- a/drm/shadertoy_circle.fs.asm
+++ b/drm/shadertoy_circle.fs.asm
@@ -1,4 +1,4 @@
-# d = length(uv)
+-- d = length(uv)
 src0.rgb = temp[0] :
   temp[0].r    = DP3 src0.rg0 src0.rg0 ;
 src0.rgb = temp[0] :
@@ -7,15 +7,15 @@ NOP
 src0.a   = temp[0] :
   temp[0].a    = RCP src0.a ;
 
-# d = abs(d - 0.5) * 1 + -0.1
-src0.a = float(48), # 0.5
-src1.a = temp[0],   # d
-src2.a = float(29), # 0.1015625
-srcp.a = sub :      # (src1.a - src0.a)
+-- d = abs(d - 0.5) * 1 + -0.1
+src0.a = float(48), -- 0.5
+src1.a = temp[0],   -- d
+src2.a = float(29), -- 0.1015625
+srcp.a = sub :      -- (src1.a - src0.a)
   temp[0].a    = MAD |srcp.a| src0.1 -src2.a ;
 
-# d = (d >= 0.0) ? 1.0 : 0.0
-# out.rgba = vec4(d, 0, 0, 1)
+-- d = (d >= 0.0) ? 1.0 : 0.0
+-- out.rgba = vec4(d, 0, 0, 1)
 OUT TEX_SEM_WAIT
 src0.a = temp[0] :
   out[0].a    = MAX src0.1 src0.1 ,
diff --git a/regs/assembler/lexer.py b/regs/assembler/lexer.py
index a7cd4b0..dfdd64b 100644
--- a/regs/assembler/lexer.py
+++ b/regs/assembler/lexer.py
@@ -112,6 +112,10 @@ class Lexer:
                 return Token(*self.pos(), TT.semicolon, self.lexeme())
             elif c == ord(','):
                 return Token(*self.pos(), TT.comma, self.lexeme())
+            elif c == ord('-') and self.peek() == ord('-'):
+                self.advance()
+                while not self.at_end_p() and self.peek() != ord('\n'):
+                    self.advance()
             elif self.minus_is_token and c == ord('-'):
                 return Token(*self.pos(), TT.minus, self.lexeme())
             elif c == ord('#'):