bb52754652
They are actually already some literals with the `f` suffix that are in our shader codebase and we never had problem in the past 5 years (or even 8 years). So I think it is safe to do and improves convergence of codestyles. Pull Request: https://projects.blender.org/blender/blender/pulls/137352
64 lines
1.9 KiB
GLSL
64 lines
1.9 KiB
GLSL
/* SPDX-FileCopyrightText: 2024 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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vec3 fresnel_conductor(float cosi, vec3 eta, vec3 k)
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{
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vec3 cosi_sqr = vec3(cosi * cosi);
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vec3 one = vec3(1.0f);
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vec3 tmp_f = (eta * eta) + (k * k);
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vec3 tmp_two_eta_cosi = 2.0f * eta * vec3(cosi);
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vec3 tmp = tmp_f * cosi_sqr;
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vec3 Rparl2 = (tmp - tmp_two_eta_cosi + one) / (tmp + tmp_two_eta_cosi + one);
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vec3 Rperp2 = (tmp_f - tmp_two_eta_cosi + cosi_sqr) / (tmp_f + tmp_two_eta_cosi + cosi_sqr);
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return (Rparl2 + Rperp2) * 0.5f;
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}
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void node_bsdf_metallic(vec4 base_color,
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vec4 edge_tint,
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vec3 ior,
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vec3 extinction,
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float roughness,
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float anisotropy,
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float rotation,
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vec3 N,
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vec3 T,
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float weight,
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const float do_multiscatter,
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const float use_complex_ior,
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out Closure result)
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{
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vec3 F0 = base_color.rgb;
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vec3 F82 = edge_tint.rgb;
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if (use_complex_ior != 0.0f) {
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/* Compute incidence at 0 and 82 degrees from conductor Fresnel. */
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F0 = fresnel_conductor(1.0f, ior, extinction);
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F82 = fresnel_conductor(1.0f / 7.0f, ior, extinction);
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}
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/* Clamp to match Cycles */
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F0 = saturate(F0);
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F82 = saturate(F82);
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roughness = saturate(roughness);
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/* Not used by EEVEE */
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/* anisotropy = saturate(anisotropy); */
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N = safe_normalize(N);
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vec3 V = coordinate_incoming(g_data.P);
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float NV = dot(N, V);
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ClosureReflection reflection_data;
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reflection_data.N = N;
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reflection_data.roughness = roughness;
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vec3 metallic_brdf;
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brdf_f82_tint_lut(F0, F82, NV, roughness, do_multiscatter != 0.0f, metallic_brdf);
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reflection_data.color = metallic_brdf;
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reflection_data.weight = weight;
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result = closure_eval(reflection_data);
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}
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