1 2#define EPSILON 0.00001 3 4#define CAVITY_BUFFER_RANGE 4.0 5 6#ifdef WORKBENCH_ENCODE_NORMALS 7 8# define WB_Normal vec2 9 10/* From http://aras-p.info/texts/CompactNormalStorage.html 11 * Using Method #4: Spheremap Transform */ 12vec3 workbench_normal_decode(vec4 enc) 13{ 14 vec2 fenc = enc.xy * 4.0 - 2.0; 15 float f = dot(fenc, fenc); 16 float g = sqrt(1.0 - f / 4.0); 17 vec3 n; 18 n.xy = fenc * g; 19 n.z = 1 - f / 2; 20 return n; 21} 22 23/* From http://aras-p.info/texts/CompactNormalStorage.html 24 * Using Method #4: Spheremap Transform */ 25WB_Normal workbench_normal_encode(bool front_face, vec3 n) 26{ 27 n = normalize(front_face ? n : -n); 28 float p = sqrt(n.z * 8.0 + 8.0); 29 n.xy = clamp(n.xy / p + 0.5, 0.0, 1.0); 30 return n.xy; 31} 32 33#else 34# define WB_Normal vec3 35/* Well just do nothing... */ 36# define workbench_normal_encode(f, a) (a) 37# define workbench_normal_decode(a) (a.xyz) 38#endif /* WORKBENCH_ENCODE_NORMALS */ 39 40/* Encoding into the alpha of a RGBA16F texture. (10bit mantissa) */ 41#define TARGET_BITCOUNT 8u 42#define METALLIC_BITS 3u /* Metallic channel is less important. */ 43#define ROUGHNESS_BITS (TARGET_BITCOUNT - METALLIC_BITS) 44 45/* Encode 2 float into 1 with the desired precision. */ 46float workbench_float_pair_encode(float v1, float v2) 47{ 48 // const uint v1_mask = ~(0xFFFFFFFFu << ROUGHNESS_BITS); 49 // const uint v2_mask = ~(0xFFFFFFFFu << METALLIC_BITS); 50 /* Same as above because some compiler are very dumb and think we use medium int. */ 51 const int v1_mask = 0x1F; 52 const int v2_mask = 0x7; 53 int iv1 = int(v1 * float(v1_mask)); 54 int iv2 = int(v2 * float(v2_mask)) << int(ROUGHNESS_BITS); 55 return float(iv1 | iv2); 56} 57 58void workbench_float_pair_decode(float data, out float v1, out float v2) 59{ 60 // const uint v1_mask = ~(0xFFFFFFFFu << ROUGHNESS_BITS); 61 // const uint v2_mask = ~(0xFFFFFFFFu << METALLIC_BITS); 62 /* Same as above because some compiler are very dumb and think we use medium int. */ 63 const int v1_mask = 0x1F; 64 const int v2_mask = 0x7; 65 int idata = int(data); 66 v1 = float(idata & v1_mask) * (1.0 / float(v1_mask)); 67 v2 = float(idata >> int(ROUGHNESS_BITS)) * (1.0 / float(v2_mask)); 68} 69