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EEVEE: optimize principled BSDF by skipping unused components

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Ref #99447
Ref #112848
This commit is contained in:
Brecht Van Lommel
2023-09-22 18:41:50 +02:00
parent a03ee1af81
commit 239edb27ad
1 changed files with 39 additions and 22 deletions
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61
source/blender/gpu/shaders/material/gpu_shader_material_principled.glsl
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@@ -89,33 +89,43 @@ void node_bsdf_principled(vec4 base_color,
weight *= alpha;
/* First layer: Sheen */
/* TODO: Maybe sheen should be specular. */
vec3 sheen_color = sheen * sheen_tint.rgb * principled_sheen(NV, sheen_roughness);
ClosureDiffuse diffuse_data;
diffuse_data.color = weight * sheen_color;
diffuse_data.N = N;
/* Attenuate lower layers */
weight *= (1.0 - max_v3(sheen_color));
if (sheen > 0.0) {
/* TODO: Maybe sheen should be specular. */
vec3 sheen_color = sheen * sheen_tint.rgb * principled_sheen(NV, sheen_roughness);
diffuse_data.color = weight * sheen_color;
/* Attenuate lower layers */
weight *= (1.0 - max_v3(sheen_color));
}
else {
diffuse_data.color = vec3(0.0);
}
/* Second layer: Coat */
ClosureReflection coat_data;
coat_data.N = CN;
coat_data.roughness = coat_roughness;
float coat_NV = dot(coat_data.N, V);
float reflectance = bsdf_lut(coat_NV, coat_data.roughness, coat_ior, 0.0).x;
coat_data.weight = weight * coat * reflectance;
coat_data.color = vec3(1.0);
/* Attenuate lower layers */
weight *= (1.0 - reflectance * coat);
if (coat == 0) {
coat_tint.rgb = vec3(1.0);
if (coat > 0.0) {
float coat_NV = dot(coat_data.N, V);
float reflectance = bsdf_lut(coat_NV, coat_data.roughness, coat_ior, 0.0).x;
coat_data.weight = weight * coat * reflectance;
/* Attenuate lower layers */
weight *= (1.0 - reflectance * coat);
if (!all(equal(coat_tint.rgb, vec3(1.0)))) {
float coat_neta = 1.0 / coat_ior;
float NT = fast_sqrt(1.0 - coat_neta * coat_neta * (1 - NV * NV));
/* Tint lower layers. */
coat_tint.rgb = pow(coat_tint.rgb, vec3(coat / NT));
}
}
else if (!all(equal(coat_tint.rgb, vec3(1.0)))) {
float coat_neta = 1.0 / coat_ior;
float NT = fast_sqrt(1.0 - coat_neta * coat_neta * (1 - NV * NV));
/* Tint lower layers. */
coat_tint.rgb = pow(coat_tint.rgb, vec3(coat / NT));
else {
coat_tint.rgb = vec3(1.0);
coat_data.weight = 0.0;
}
/* Attenuated by sheen and coat. */
@@ -128,7 +138,7 @@ void node_bsdf_principled(vec4 base_color,
reflection_data.N = N;
reflection_data.roughness = roughness;
if (true) {
if (metallic > 0.0) {
vec3 F0 = base_color.rgb;
vec3 F90 = vec3(1.0);
vec2 split_sum = brdf_lut(NV, roughness);
@@ -138,11 +148,17 @@ void node_bsdf_principled(vec4 base_color,
/* Attenuate lower layers */
weight *= (1.0 - metallic);
}
else {
reflection_data.color = vec3(0.0);
}
/* Transmission component */
ClosureRefraction refraction_data;
refraction_data.N = N;
refraction_data.roughness = roughness;
refraction_data.ior = ior;
vec3 reflection_tint = specular_tint.rgb;
if (true) {
if (transmission > 0.0) {
vec3 F0 = vec3(F0_from_ior(ior)) * reflection_tint;
vec3 F90 = vec3(1.0);
vec3 reflectance, transmittance;
@@ -153,12 +169,13 @@ void node_bsdf_principled(vec4 base_color,
refraction_data.weight = weight * transmission;
refraction_data.color = transmittance * coat_tint.rgb;
refraction_data.N = N;
refraction_data.roughness = roughness;
refraction_data.ior = ior;
/* Attenuate lower layers */
weight *= (1.0 - transmission);
}
else {
refraction_data.weight = 0.0;
refraction_data.color = vec3(0.0);
}
/* Specular component */
if (true) {