X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Futil.h;fp=src%2Futil.h;h=f719b17b3735d397fcb924df46aaf754639726b6;hb=a4b392b15da0d7da367b1121ec5949f26e10628a;hp=3bbafbd75771e9001be00f240a2a79eabef4dfaa;hpb=dd3064e651cf180e0e02919d644bb0bd86c4e763;p=gbajam22

diff --git a/src/util.h b/src/util.h
index 3bbafbd..f719b17 100644
--- a/src/util.h
+++ b/src/util.h
@@ -29,8 +29,14 @@ void present(int buf);		/* defined in src/pc/main.c */
 
 extern int16_t sinlut[];
 
-#define SIN(x)	sinlut[(x) & 0xff]
-#define COS(x)	sinlut[((x) + 64) & 0xff]
+#define SINLUT_BITS		8
+#define SINLUT_SIZE		(1 << SINLUT_BITS)
+
+#define SIN(angle) \
+	((int32_t)sinlut[((angle) >> (16 - SINLUT_BITS)) & (SINLUT_SIZE - 1)] << 1)
+
+#define COS(angle) \
+	((int32_t)sinlut[(((angle) >> (16 - SINLUT_BITS)) + (SINLUT_SIZE / 4)) & (SINLUT_SIZE - 1)] << 1)
 
 int iwram_brk(void *addr);
 void *iwram_sbrk(intptr_t delta);