- add atan2 to glsl and PI constant for all platforms

Author: polymonster

platform/glsl.h

@@ -50,6 +50,7 @@ precision highp sampler2DArray;
 #define mul( A, B ) ((A) * (B))
 #define mul_tbn( A, B ) ((B) * (A))
 #define saturate( A ) (clamp( A, 0.0, 1.0 ))
+#define atan2( A, B ) (atan(B, A))
 #define ddx dFdx
 #define ddy dFdy
 #define _pmfx_unroll

platform/pmfx.h

@@ -1,5 +1,6 @@
 #define chebyshev_normalize( V ) (V.xyz / max( max(abs(V.x), abs(V.y)), abs(V.z) ))    
 #define max3(v) max(max(v.x, v.y),v.z)
 #define max4(v) max(max(max(v.x, v.y),v.z), v.w)
+#define PI 3.14159265358979323846264