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/* Required by some nodes. */
#pragma BLENDER_REQUIRE(common_hair_lib.glsl)
#pragma BLENDER_REQUIRE(common_utiltex_lib.glsl)
#pragma BLENDER_REQUIRE(closure_type_lib.glsl)
#pragma BLENDER_REQUIRE(closure_eval_lib.glsl)
#pragma BLENDER_REQUIRE(closure_eval_diffuse_lib.glsl)
#pragma BLENDER_REQUIRE(closure_eval_glossy_lib.glsl)
#pragma BLENDER_REQUIRE(closure_eval_translucent_lib.glsl)
#pragma BLENDER_REQUIRE(closure_eval_refraction_lib.glsl)
#pragma BLENDER_REQUIRE(surface_lib.glsl)
#pragma BLENDER_REQUIRE(volumetric_lib.glsl)
#ifdef USE_ALPHA_BLEND
/* Use dual source blending to be able to make a whole range of effects. */
layout(location = 0, index = 0) out vec4 outRadiance;
layout(location = 0, index = 1) out vec4 outTransmittance;
#else /* OPAQUE */
layout(location = 0) out vec4 outRadiance;
layout(location = 1) out vec2 ssrNormals;
layout(location = 2) out vec4 ssrData;
# ifdef USE_SSS
layout(location = 3) out vec3 sssIrradiance;
layout(location = 4) out float sssRadius;
layout(location = 5) out vec3 sssAlbedo;
# endif
#endif
void main()
{
Closure cl = nodetree_exec();
float holdout = saturate(1.0 - cl.holdout);
float transmit = saturate(avg(cl.transmittance));
float alpha = 1.0 - transmit;
#ifdef USE_ALPHA_BLEND
vec2 uvs = gl_FragCoord.xy * volCoordScale.zw;
vec3 vol_transmit, vol_scatter;
volumetric_resolve(uvs, gl_FragCoord.z, vol_transmit, vol_scatter);
/* Removes part of the volume scattering that have
* already been added to the destination pixels.
* Since we do that using the blending pipeline we need to account for material transmittance. */
vol_scatter -= vol_scatter * cl.transmittance;
cl.radiance = cl.radiance * holdout * vol_transmit + vol_scatter;
outRadiance = vec4(cl.radiance, alpha * holdout);
outTransmittance = vec4(cl.transmittance, transmit) * holdout;
#else
outRadiance = vec4(cl.radiance, holdout);
ssrNormals = cl.ssr_normal;
ssrData = cl.ssr_data;
# ifdef USE_SSS
sssIrradiance = cl.sss_irradiance;
sssRadius = cl.sss_radius;
sssAlbedo = cl.sss_albedo;
# endif
#endif
/* For Probe capture */
#ifdef USE_SSS
float fac = float(!sssToggle);
/* TODO(fclem): we shouldn't need this.
* Just disable USE_SSS when USE_REFRACTION is enabled. */
# ifdef USE_REFRACTION
/* SSRefraction pass is done after the SSS pass.
* In order to not lose the diffuse light totally we
* need to merge the SSS radiance to the main radiance. */
fac = 1.0;
# endif
outRadiance.rgb += cl.sss_irradiance.rgb * cl.sss_albedo.rgb * fac;
#endif
#ifndef USE_ALPHA_BLEND
float alpha_div = safe_rcp(alpha);
outRadiance.rgb *= alpha_div;
ssrData.rgb *= alpha_div;
# ifdef USE_SSS
sssAlbedo.rgb *= alpha_div;
# endif
#endif
#ifdef LOOKDEV
/* Lookdev spheres are rendered in front. */
gl_FragDepth = 0.0;
#endif
}
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