fix an uninitialized variable

[xonotic/darkplaces.git] / mathlib.h

diff --git a/mathlib.h b/mathlib.h
index 2ce09e514fee393f94a5e8a84ac05b7e3e854a61..61ada9963822ba6fc7cd576c6120083fe5c315f3 100644 (file)
--- a/mathlib.h
+++ b/mathlib.h
@@ -53,15 +53,23 @@ extern vec3_t vec3_origin;
 #define lhrandom(MIN,MAX) (((double)rand() / RAND_MAX) * ((MAX)-(MIN)) + (MIN))
 
 #define invpow(base,number) (log(number) / log(base))
+
+// returns log base 2 of "n" (WARNING: "n" MUST be a power of 2!)
 #define log2i(n) ((((n) & 0xAAAAAAAA) != 0 ? 1 : 0) | (((n) & 0xCCCCCCCC) != 0 ? 2 : 0) | (((n) & 0xF0F0F0F0) != 0 ? 4 : 0) | (((n) & 0xFF00FF00) != 0 ? 8 : 0) | (((n) & 0xFFFF0000) != 0 ? 16 : 0))
+
+// TOCHECK: what is this function supposed to do?
 #define bit2i(n) log2i((n) << 1)
 
+// returns the smallest integer greater than or equal to "value", or 0 if "value" is too big
+unsigned int CeilPowerOf2(unsigned int value);
+
 #define DEG2RAD(a) ((a) * ((float) M_PI / 180.0f))
 #define RAD2DEG(a) ((a) * (180.0f / (float) M_PI))
 #define ANGLEMOD(a) (((int) ((a) * (65536.0f / 360.0f)) & 65535) * (360.0f / 65536.0f))
 
 #define VectorNegate(a,b) ((b)[0]=-((a)[0]),(b)[1]=-((a)[1]),(b)[2]=-((a)[2]))
 #define VectorSet(a,b,c,d) ((a)[0]=(b),(a)[1]=(c),(a)[2]=(d))
+#define Vector4Set(a,b,c,d,e) ((a)[0]=(b),(a)[1]=(c),(a)[2]=(d),(a)[3]=(e))
 #define VectorClear(a) ((a)[0]=(a)[1]=(a)[2]=0)
 #define DotProduct(a,b) ((a)[0]*(b)[0]+(a)[1]*(b)[1]+(a)[2]*(b)[2])
 #define VectorSubtract(a,b,c) ((c)[0]=(a)[0]-(b)[0],(c)[1]=(a)[1]-(b)[1],(c)[2]=(a)[2]-(b)[2])