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/* Assumes GPU_VEC4 is color data. So converting to luminance like cycles. */
#define float_from_vec4(v) dot(v.rgb, vec3(0.2126, 0.7152, 0.0722))
#define float_from_vec3(v) avg(v.rgb)
#define float_from_vec2(v) v.r
#define vec2_from_vec4(v) vec2(avg(v.rgb), v.a)
#define vec2_from_vec3(v) vec2(avg(v.rgb), 1.0)
#define vec2_from_float(v) vec2(v)
#define vec3_from_vec4(v) v.rgb
#define vec3_from_vec2(v) v.rrr
#define vec3_from_float(v) vec3(v)
#define vec4_from_vec3(v) vec4(v, 1.0)
#define vec4_from_vec2(v) v.rrrg
#define vec4_from_float(v) vec4(vec3(v), 1.0)
#define RAY_TYPE_CAMERA 0
#define RAY_TYPE_SHADOW 1
#define RAY_TYPE_DIFFUSE 2
#define RAY_TYPE_GLOSSY 3
#ifdef GPU_FRAGMENT_SHADER
# define FrontFacing gl_FrontFacing
#else
# define FrontFacing true
#endif
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