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#include "UnityCG.cginc"
#include "globals.cginc"
#include "iq_sdf.cginc"
#include "interpolators.cginc"
#ifndef __ZWRITE_ABOMINATION_INC
#define __ZWRITE_ABOMINATION_INC
#if defined(_GIMMICK_ZWRITE_ABOMINATION)
struct ZWriteAbominationPBR {
float3 worldPos;
float3 normal;
float4 albedo;
float metallic;
float roughness;
float depth;
};
#define BODY_PART_BODY 0
#define BODY_PART_LENS 1
#define BODY_PART_EYE_WHITE 2
#define BODY_PART_PUPIL 3
#define BODY_PART_ARM 4
#define BODY_PART_LEG 5
#define BODY_PART_MOUTH 6
#define BODY_PART_DENIM 7
#define BODY_PART_DENIM_STRAP 7
#define BODY_PART_EYE_STRAP 8
float zwrite_abomination_map(float3 p, out uint body_part) {
float epsilon = 1E-4;
float d;
// Capsule representing body
{
float body_half_height = _Gimmick_ZWrite_Abomination_Body_Half_Height;
float body_radius = _Gimmick_ZWrite_Abomination_Body_Radius;
float body_d = distance_from_capsule(p, float3(0, -body_half_height, 0), float3(0, body_half_height, 0), body_radius);
body_part = BODY_PART_BODY;
d = body_d;
}
// Capsule representing denim
{
float3 denim_center = _Gimmick_ZWrite_Abomination_Denim_Center;
float3 pp = p - denim_center;
float denim_half_height = _Gimmick_ZWrite_Abomination_Denim_Half_Height;
float denim_radius = _Gimmick_ZWrite_Abomination_Denim_Radius;
float denim_d = distance_from_capsule(pp, float3(0, -denim_half_height, 0), float3(0, denim_half_height, 0), denim_radius);
body_part = denim_d < d ? BODY_PART_DENIM : body_part;
d = min(d, denim_d);
}
// Torus representing denim strap
{
float3 strap_center = _Gimmick_ZWrite_Abomination_Denim_Strap_Center;
float3 pp = p;
pp.x = abs(pp.x);
pp -= strap_center;
// Rotate about z axis
float theta = _Gimmick_ZWrite_Abomination_Denim_Strap_Z_Theta;
float2x2 rot = float2x2(float2(cos(theta), -sin(theta)), float2(sin(theta), cos(theta)));
pp.xy = mul(rot, pp.xy);
pp = pp.zyx;
float strap_theta = _Gimmick_ZWrite_Abomination_Denim_Strap_Theta;
float strap_ra = _Gimmick_ZWrite_Abomination_Denim_Strap_RA;
float strap_rb = _Gimmick_ZWrite_Abomination_Denim_Strap_RB;
float strap_d = distance_from_capped_torus(pp, float2(sin(strap_theta), cos(strap_theta)), strap_ra, strap_rb);
body_part = strap_d < d ? BODY_PART_DENIM_STRAP : body_part;
d = min(d, strap_d);
}
// Metal ring around the eye
{
float3 eye_center = _Gimmick_ZWrite_Abomination_Eye_Center;
float3 pp = (p - eye_center).xzy;
float lens_radius = _Gimmick_ZWrite_Abomination_Lens_Radius;
float lens_depth = _Gimmick_ZWrite_Abomination_Lens_Depth;
float lens_thickness = _Gimmick_ZWrite_Abomination_Lens_Thickness;
float lens_d0 = distance_from_capped_cylinder(pp, lens_depth, lens_radius);
// TODO do we need a capped cylinder? Can we use a more efficient SDF to cut out the middle?
float lens_d1 = distance_from_capped_cylinder(pp, lens_depth + 0.1, lens_radius - lens_thickness);
float lens_d = op_sub(lens_d1, lens_d0);
body_part = lens_d < d ? BODY_PART_LENS : body_part;
d = min(d, lens_d);
// White of eye
float eye_white_d = distance_from_capped_cylinder(pp, lens_depth * 0.5, lens_radius - lens_thickness * 0.5);
body_part = eye_white_d < d ? BODY_PART_EYE_WHITE : body_part;
d = min(d, eye_white_d);
// Pupil
float pupil_d = length(pp) - _Gimmick_ZWrite_Abomination_Pupil_Radius;
body_part = pupil_d < d ? BODY_PART_PUPIL : body_part;
d = min(d, pupil_d);
}
// Strap holding metal ring to head
{
float3 pp = p;
pp.y -= _Gimmick_ZWrite_Abomination_Eye_Center.y;
float strap_d = distance_from_capped_cylinder(pp, _Gimmick_ZWrite_Abomination_Lens_Strap_Height, _Gimmick_ZWrite_Abomination_Body_Radius * 1.001);
body_part = strap_d < d ? BODY_PART_EYE_STRAP : body_part;
d = min(d, strap_d);
}
// Mouth
{
float3 mouth_center = _Gimmick_ZWrite_Abomination_Mouth_Center;
float3 pp = p;
pp -= mouth_center;
pp.y = -pp.y;
float theta = _Gimmick_ZWrite_Abomination_Mouth_Theta;
float ra = _Gimmick_ZWrite_Abomination_Mouth_RA;
float rb = _Gimmick_ZWrite_Abomination_Mouth_RB;
float mouth_d = distance_from_capped_torus(pp, float2(sin(theta), cos(theta)), ra, rb);
body_part = mouth_d < d ? BODY_PART_MOUTH : body_part;
d = min(d, mouth_d);
}
// Arms
{
float3 arm_center = _Gimmick_ZWrite_Abomination_Arm_Center;
float3 pp = p;
pp.x = abs(pp.x); // Symmetrize along x axis
pp -= arm_center;
float arm_radius = _Gimmick_ZWrite_Abomination_Arm_Radius;
float arm_half_length = _Gimmick_ZWrite_Abomination_Arm_Half_Length;
float arm_d = distance_from_capsule(pp, float3(-arm_half_length, 0, 0), float3(arm_half_length, 0, 0), arm_radius);
body_part = arm_d < d ? BODY_PART_ARM : body_part;
d = min(d, arm_d);
}
// Legs
{
float3 leg_center = _Gimmick_ZWrite_Abomination_Leg_Center;
float3 pp = p.yxz;
pp.y = abs(pp.y); // Symmetrize
pp -= leg_center;
float leg_radius = _Gimmick_ZWrite_Abomination_Leg_Radius;
float leg_half_length = _Gimmick_ZWrite_Abomination_Leg_Half_Length;
float leg_d = distance_from_capsule(pp, float3(-leg_half_length, 0, 0), float3(leg_half_length, 0, 0), leg_radius);
body_part = leg_d < d ? BODY_PART_LEG : body_part;
d = min(d, leg_d);
}
return d;
}
// TODO tetrahedral normals
float3 zwrite_abomination_normal(float3 p) {
float3 epsilon = float3(1, 0, 0) * _Gimmick_ZWrite_Abomination_Normal_Epsilon;
uint body_part;
return normalize(float3(
zwrite_abomination_map(p + epsilon.xyy, body_part) - zwrite_abomination_map(p - epsilon.xyy, body_part),
zwrite_abomination_map(p + epsilon.yxy, body_part) - zwrite_abomination_map(p - epsilon.yxy, body_part),
zwrite_abomination_map(p + epsilon.yyx, body_part) - zwrite_abomination_map(p - epsilon.yyx, body_part)
));
}
ZWriteAbominationPBR zwrite_abomination(in v2f i)
{
float3 cam_pos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1));
float3 rd = normalize(i.objPos - cam_pos);
float3 ro = cam_pos + rd * _Gimmick_ZWrite_Abomination_Initial_Step_Size;
// TODO raytrace ro near the object
const float MIN_HIT_DIST = _Gimmick_ZWrite_Abomination_Min_Hit_Dist;
const float MAX_DIST = 1;
const uint MARCH_STEPS = _Gimmick_ZWrite_Abomination_March_Steps;
float total_dist = 0;
float d;
uint body_part;
for (uint ii = 0; ii < MARCH_STEPS; ++ii) {
float3 p = ro + rd * total_dist;
d = zwrite_abomination_map(p, body_part);
if (d < MIN_HIT_DIST) {
break;
}
total_dist += d;
}
ZWriteAbominationPBR pbr;
if (d < MIN_HIT_DIST) {
float3 p = ro + rd * total_dist;
pbr.worldPos = mul(unity_ObjectToWorld, float4(p, 1.0)).xyz;
float3 c = 1;
c = (body_part == BODY_PART_BODY) ? _Gimmick_ZWrite_Abomination_Skin_Color : c;
c = (body_part == BODY_PART_ARM) ? _Gimmick_ZWrite_Abomination_Skin_Color : c;
c = (body_part == BODY_PART_LEG) ? _Gimmick_ZWrite_Abomination_Skin_Color : c;
c = (body_part == BODY_PART_LENS) ? _Gimmick_ZWrite_Abomination_Lens_Color : c;
c = (body_part == BODY_PART_EYE_WHITE) ? 1 : c;
c = (body_part == BODY_PART_PUPIL) ? 0 : c;
c = (body_part == BODY_PART_MOUTH) ? 0 : c;
c = (body_part == BODY_PART_DENIM) ? _Gimmick_ZWrite_Abomination_Denim_Color : c;
c = (body_part == BODY_PART_DENIM_STRAP) ? _Gimmick_ZWrite_Abomination_Denim_Color : c;
c = (body_part == BODY_PART_EYE_STRAP) ? _Gimmick_ZWrite_Abomination_Lens_Strap_Color : c;
float metallic = 0;
metallic = (body_part == BODY_PART_BODY) ? _Gimmick_ZWrite_Abomination_Skin_Metallic : metallic;
metallic = (body_part == BODY_PART_ARM) ? _Gimmick_ZWrite_Abomination_Skin_Metallic : metallic;
metallic = (body_part == BODY_PART_LEG) ? _Gimmick_ZWrite_Abomination_Skin_Metallic : metallic;
metallic = (body_part == BODY_PART_LENS) ? _Gimmick_ZWrite_Abomination_Lens_Metallic : metallic;
metallic = (body_part == BODY_PART_EYE_WHITE) ? 0 : metallic;
metallic = (body_part == BODY_PART_PUPIL) ? 0 : metallic;
metallic = (body_part == BODY_PART_MOUTH) ? 0 : metallic;
metallic = (body_part == BODY_PART_DENIM) ? _Gimmick_ZWrite_Abomination_Denim_Metallic : metallic;
metallic = (body_part == BODY_PART_DENIM_STRAP) ? _Gimmick_ZWrite_Abomination_Denim_Metallic : metallic;
metallic = (body_part == BODY_PART_EYE_STRAP) ? _Gimmick_ZWrite_Abomination_Lens_Strap_Metallic : metallic;
float roughness = 0;
roughness = (body_part == BODY_PART_BODY) ? _Gimmick_ZWrite_Abomination_Skin_Roughness : roughness;
roughness = (body_part == BODY_PART_ARM) ? _Gimmick_ZWrite_Abomination_Skin_Roughness : roughness;
roughness = (body_part == BODY_PART_LEG) ? _Gimmick_ZWrite_Abomination_Skin_Roughness : roughness;
roughness = (body_part == BODY_PART_LENS) ? _Gimmick_ZWrite_Abomination_Lens_Roughness : roughness;
roughness = (body_part == BODY_PART_EYE_WHITE) ? 0 : roughness;
roughness = (body_part == BODY_PART_PUPIL) ? 0 : roughness;
roughness = (body_part == BODY_PART_MOUTH) ? 1 : roughness;
roughness = (body_part == BODY_PART_DENIM) ? _Gimmick_ZWrite_Abomination_Denim_Roughness : roughness;
roughness = (body_part == BODY_PART_DENIM_STRAP) ? _Gimmick_ZWrite_Abomination_Denim_Roughness : roughness;
roughness = (body_part == BODY_PART_EYE_STRAP) ? _Gimmick_ZWrite_Abomination_Lens_Strap_Roughness : roughness;
pbr.albedo = float4(c, 1);
pbr.metallic = metallic;
pbr.roughness = roughness;
pbr.normal = UnityObjectToWorldNormal(zwrite_abomination_normal(p));
float4 clip_pos = mul(UNITY_MATRIX_VP, float4(mul(unity_ObjectToWorld, float4(p, 1.0))));
pbr.depth = clip_pos.z / clip_pos.w;
} else {
pbr.worldPos = i.worldPos;
pbr.albedo = 0;
pbr.metallic = 0;
pbr.roughness = 1;
pbr.normal = i.normal;
pbr.depth = -1E6;
}
return pbr;
}
#endif // _GIMMICK_ZWRITE_ABOMINATION
#endif // __ZWRITE_ABOMINATION_INC
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