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#ifndef __YUM_LIGHTING_INC
#define __YUM_LIGHTING_INC
#include "UnityCG.cginc"
#include "AutoLight.cginc"
#include "UnityPBSLighting.cginc"
#include "UnityLightingCommon.cginc"
#include "features.cginc"
#include "yum_pbr.cginc"
struct YumLighting {
float3 view_dir;
float3 dir;
float3 direct;
float3 diffuse;
float3 specular;
float NoL;
#if defined(_WRAPPED_LIGHTING)
float NoL_wrapped_s; // specular
float NoL_wrapped_d; // diffuse
#endif
float attenuation;
};
float getShadowAttenuation(v2f i)
{
float attenuation;
// This whole block is yoinked from AutoLight.cginc. I needed a way to
// control shadow strength so I had to duplicate the code.
#if defined(DIRECTIONAL_COOKIE)
DECLARE_LIGHT_COORD(i, i.worldPos);
float shadow = UNITY_SHADOW_ATTENUATION(i, i.worldPos);
attenuation = tex2D(_LightTexture0, lightCoord).w;
#elif defined(POINT_COOKIE)
DECLARE_LIGHT_COORD(i, i.worldPos);
float shadow = UNITY_SHADOW_ATTENUATION(i, i.worldPos);
attenuation = tex2D(_LightTextureB0, dot(lightCoord, lightCoord).rr).r *
texCUBE(_LightTexture0, lightCoord).w;
#elif defined(DIRECTIONAL)
float shadow = UNITY_SHADOW_ATTENUATION(i, i.worldPos);
attenuation = 1;
#elif defined(SPOT)
DECLARE_LIGHT_COORD(i, i.worldPos);
float shadow = UNITY_SHADOW_ATTENUATION(i, i.worldPos);
attenuation = (lightCoord.z > 0) * UnitySpotCookie(lightCoord) *
UnitySpotAttenuate(lightCoord.xyz);
#elif defined(POINT)
unityShadowCoord3 lightCoord =
mul(unity_WorldToLight, unityShadowCoord4(i.worldPos, 1)).xyz;
float shadow = UNITY_SHADOW_ATTENUATION(i, i.worldPos);
attenuation = tex2D(_LightTexture0, dot(lightCoord, lightCoord).rr).r;
#else
float shadow = 1;
attenuation = 1;
#endif
attenuation *= lerp(1, shadow, _Shadow_Strength);
return attenuation;
}
float3 getDirectLightDirection(v2f i) {
#if defined(POINT) || defined(POINT_COOKIE) || defined(SPOT)
return normalize((_WorldSpaceLightPos0 - i.worldPos).xyz);
#else
return _WorldSpaceLightPos0;
#endif
}
float GetLodRoughness(float roughness) {
return (1.0 / UNITY_SPECCUBE_LOD_STEPS) * roughness * (1.7 - 0.7 * roughness);
}
float3 getIndirectSpecular(v2f i, YumPbr pbr, float3 view_dir) {
float roughness = GetLodRoughness(pbr.roughness_perceptual);
float3 reflect_dir = reflect(-view_dir, pbr.normal);
UnityGIInput data;
data.worldPos = i.worldPos;
data.worldViewDir = view_dir;
data.probeHDR[0] = unity_SpecCube0_HDR;
data.probeHDR[1] = unity_SpecCube1_HDR;
#if defined(UNITY_SPECCUBE_BLENDING) || defined(UNITY_SPECCUBE_BOX_PROJECTION)
data.boxMin[0] = unity_SpecCube0_BoxMin; // .w holds lerp value for blending
#endif
#ifdef UNITY_SPECCUBE_BOX_PROJECTION
data.boxMax[0] = unity_SpecCube0_BoxMax;
data.probePosition[0] = unity_SpecCube0_ProbePosition;
data.boxMax[1] = unity_SpecCube1_BoxMax;
data.boxMin[1] = unity_SpecCube1_BoxMin;
data.probePosition[1] = unity_SpecCube1_ProbePosition;
#endif
return UnityGI_prefilteredRadiance(data, pbr.roughness_perceptual,
reflect_dir);
}
float4 getIndirectDiffuse(v2f i, float4 vertexLightColor) {
float4 diffuse = vertexLightColor;
#if defined(FORWARD_BASE_PASS)
#if defined(LIGHTMAP_ON)
diffuse.xyz = DecodeLightmap(UNITY_SAMPLE_TEX2D(unity_Lightmap, i.uv2));
#else
diffuse.xyz += max(0, BetterSH9(float4(0, 0, 0, 1)));
#endif
#endif
return diffuse;
}
YumLighting GetYumLighting(v2f i, YumPbr pbr) {
YumLighting light;
// normalize has no visibile impact in test scene
light.view_dir = -i.eyeVec.xyz;
#if defined(POINT) || defined(POINT_COOKIE) || defined(SPOT)
light.dir = normalize((_WorldSpaceLightPos0 - i.worldPos).xyz);
#else
light.dir = _WorldSpaceLightPos0;
#endif
light.direct = _LightColor0.rgb;
// TODO filament's spherical harmonics look nicer than this.
// See FilamentLightIndirect.cginc::UnityGI_Irradiance in filamented.
//ifex _Spherical_Harmonics==0
light.diffuse = max(0, BetterSH9(float4(i.normal, 1)));
//endex
//ifex _Spherical_Harmonics==1
light.diffuse = max(0, BetterSH9(float4(0, 0, 0, 1)));
//endex
#if defined(_MIN_BRIGHTNESS)
light.diffuse = max(_Min_Brightness, light.diffuse);
#endif
light.specular = getIndirectSpecular(i, pbr, light.view_dir);
#if defined(_QUANTIZE_SPECULAR)
float specular_luminance = dot(light.specular, float3(0.2126, 0.7152, 0.0722)); // convert to luminance
light.specular = light.specular * floor(specular_luminance * _Quantize_Specular_Steps) / _Quantize_Specular_Steps;
#endif
#if defined(_QUANTIZE_DIFFUSE)
float diffuse_luminance = dot(light.diffuse, float3(0.2126, 0.7152, 0.0722)); // convert to luminance
light.diffuse = light.diffuse * floor(diffuse_luminance * _Quantize_Diffuse_Steps) / _Quantize_Diffuse_Steps;
#endif
light.NoL = saturate(dot(pbr.normal, light.dir));
#if defined(_QUANTIZE_NOL)
light.NoL = floor(light.NoL * _Quantize_NoL_Steps) / _Quantize_NoL_Steps;
#endif
#if defined(_WRAPPED_LIGHTING)
light.NoL_wrapped_s = wrapNoL(light.NoL, _Wrap_NoL_Specular_Strength);
light.NoL_wrapped_d = wrapNoL(light.NoL, _Wrap_NoL_Diffuse_Strength);
#endif
light.attenuation = getShadowAttenuation(i);
return light;
}
#endif // __YUM_LIGHTING_INC
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