Fix: angle could overflow to 4097

jserv · jserv · commit 310e4c8c4160 · 2022-10-23T05:30:37.000+08:00
Found with AddressSanitizer.
diff --git a/src/r_segs.c b/src/r_segs.c
@@ -260,6 +260,7 @@ void R_RenderSegLoop (void)
         {
             // calculate texture offset
             angle = (rw_centerangle + xtoviewangle[rw_x])>>ANGLETOFINESHIFT;
+            angle &= 0x0FFF;
             texturecolumn = rw_offset-FixedMul(finetangent[angle],rw_distance);
             texturecolumn >>= FRACBITS;
             // calculate lighting

Original file line number	Diff line number	Diff line change
`@@ -260,6 +260,7 @@ void R_RenderSegLoop (void)`
`260`	`260`	`{`
`261`	`261`	`// calculate texture offset`
`262`	`262`	`angle = (rw_centerangle + xtoviewangle[rw_x])>>ANGLETOFINESHIFT;`
	`263`	`+ angle &= 0x0FFF;`
`263`	`264`	`texturecolumn = rw_offset-FixedMul(finetangent[angle],rw_distance);`
`264`	`265`	`texturecolumn >>= FRACBITS;`
`265`	`266`	`// calculate lighting`