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Avoid some unnecessary calculations in scene.glsl.

This commit is contained in:
Ferenc Arn 2018-10-02 14:07:16 -04:00 committed by tagcup
parent 45842c0ea9
commit 35ea827e83
2 changed files with 51 additions and 67 deletions
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63
drivers/gles2/shaders/scene.glsl
View File

@ -247,7 +247,7 @@ void light_compute(
float cLdotH = max(dot(L, H), 0.0); float cLdotH = max(dot(L, H), 0.0);
float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25; float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25;
float blinn = pow(cNdotH, shininess); float blinn = pow(cNdotH, shininess);
blinn *= (shininess + 8.0) / (8.0 * 3.141592654); blinn *= (shininess + 8.0) * (1.0 / (8.0 * M_PI));
specular_brdf_NL = (blinn) / max(4.0 * cNdotV * cNdotL, 0.75); specular_brdf_NL = (blinn) / max(4.0 * cNdotV * cNdotL, 0.75);
#endif #endif
@ -953,9 +953,7 @@ float G_GGX_2cos(float cos_theta_m, float alpha) {
// This approximates G_GGX_2cos(cos_theta_l, alpha) * G_GGX_2cos(cos_theta_v, alpha) // This approximates G_GGX_2cos(cos_theta_l, alpha) * G_GGX_2cos(cos_theta_v, alpha)
// See Filament docs, Specular G section. // See Filament docs, Specular G section.
float V_GGX(float cos_theta_l, float cos_theta_v, float alpha) { float V_GGX(float cos_theta_l, float cos_theta_v, float alpha) {
float v = cos_theta_l * (cos_theta_v * (1.0 - alpha) + alpha); return 0.5 / mix(2.0 * cos_theta_l * cos_theta_v, cos_theta_l + cos_theta_v, alpha);
float l = cos_theta_v * (cos_theta_l * (1.0 - alpha) + alpha);
return 0.5 / (v + l);
} }
float D_GGX(float cos_theta_m, float alpha) { float D_GGX(float cos_theta_m, float alpha) {
@ -1067,6 +1065,18 @@ LIGHT_SHADER_CODE
float NdotV = dot(N, V); float NdotV = dot(N, V);
float cNdotV = max(NdotV, 0.0); float cNdotV = max(NdotV, 0.0);
#if defined(DIFFUSE_BURLEY) || defined(SPECULAR_BLINN) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_USE_CLEARCOAT)
vec3 H = normalize(V + L);
#endif
#if defined(SPECULAR_BLINN) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_USE_CLEARCOAT)
float cNdotH = max(dot(N, H), 0.0);
#endif
#if defined(DIFFUSE_BURLEY) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_USE_CLEARCOAT)
float cLdotH = max(dot(L, H), 0.0);
#endif
if (metallic < 1.0) { if (metallic < 1.0) {
#if defined(DIFFUSE_OREN_NAYAR) #if defined(DIFFUSE_OREN_NAYAR)
vec3 diffuse_brdf_NL; vec3 diffuse_brdf_NL;
@ -1101,13 +1111,9 @@ LIGHT_SHADER_CODE
#elif defined(DIFFUSE_BURLEY) #elif defined(DIFFUSE_BURLEY)
{ {
float FD90_minus_1 = 2.0 * cLdotH * cLdotH * roughness - 0.5;
vec3 H = normalize(V + L); float FdV = 1.0 + FD90_minus_1 * SchlickFresnel(cNdotV);
float cLdotH = max(0.0, dot(L, H)); float FdL = 1.0 + FD90_minus_1 * SchlickFresnel(cNdotL);
float FD90 = 0.5 + 2.0 * cLdotH * cLdotH * roughness;
float FdV = 1.0 + (FD90 - 1.0) * SchlickFresnel(cNdotV);
float FdL = 1.0 + (FD90 - 1.0) * SchlickFresnel(cNdotL);
diffuse_brdf_NL = (1.0 / M_PI) * FdV * FdL * cNdotL; diffuse_brdf_NL = (1.0 / M_PI) * FdV * FdL * cNdotL;
/* /*
float energyBias = mix(roughness, 0.0, 0.5); float energyBias = mix(roughness, 0.0, 0.5);
@ -1150,13 +1156,9 @@ LIGHT_SHADER_CODE
#if defined(SPECULAR_BLINN) #if defined(SPECULAR_BLINN)
//normalized blinn //normalized blinn
vec3 H = normalize(V + L);
float cNdotH = max(dot(N, H), 0.0);
float cVdotH = max(dot(V, H), 0.0);
float cLdotH = max(dot(L, H), 0.0);
float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25; float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25;
float blinn = pow(cNdotH, shininess); float blinn = pow(cNdotH, shininess);
blinn *= (shininess + 8.0) / (8.0 * 3.141592654); blinn *= (shininess + 8.0) * (1.0 / (8.0 * M_PI));
specular_brdf_NL = (blinn) / max(4.0 * cNdotV * cNdotL, 0.75); specular_brdf_NL = (blinn) / max(4.0 * cNdotV * cNdotL, 0.75);
#elif defined(SPECULAR_PHONG) #elif defined(SPECULAR_PHONG)
@ -1165,7 +1167,7 @@ LIGHT_SHADER_CODE
float cRdotV = max(0.0, dot(R, V)); float cRdotV = max(0.0, dot(R, V));
float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25; float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25;
float phong = pow(cRdotV, shininess); float phong = pow(cRdotV, shininess);
phong *= (shininess + 8.0) / (8.0 * 3.141592654); phong *= (shininess + 8.0) * (1.0 / (8.0 * M_PI));
specular_brdf_NL = (phong) / max(4.0 * cNdotV * cNdotL, 0.75); specular_brdf_NL = (phong) / max(4.0 * cNdotV * cNdotL, 0.75);
#elif defined(SPECULAR_TOON) #elif defined(SPECULAR_TOON)
@ -1181,11 +1183,6 @@ LIGHT_SHADER_CODE
#elif defined(SPECULAR_SCHLICK_GGX) #elif defined(SPECULAR_SCHLICK_GGX)
// shlick+ggx as default // shlick+ggx as default
vec3 H = normalize(V + L);
float cNdotH = max(dot(N, H), 0.0);
float cLdotH = max(dot(L, H), 0.0);
#if defined(LIGHT_USE_ANISOTROPY) #if defined(LIGHT_USE_ANISOTROPY)
float alpha = roughness * roughness; float alpha = roughness * roughness;
float aspect = sqrt(1.0 - anisotropy * 0.9); float aspect = sqrt(1.0 - anisotropy * 0.9);
@ -1216,24 +1213,18 @@ LIGHT_SHADER_CODE
specular_light += specular_brdf_NL * light_color * specular_blob_intensity * attenuation; specular_light += specular_brdf_NL * light_color * specular_blob_intensity * attenuation;
#if defined(LIGHT_USE_CLEARCOAT) #if defined(LIGHT_USE_CLEARCOAT)
if (clearcoat_gloss > 0.0) {
#if !defined(SPECULAR_SCHLICK_GGX) && !defined(SPECULAR_BLINN)
vec3 H = normalize(V + L);
#endif
#if !defined(SPECULAR_SCHLICK_GGX) #if !defined(SPECULAR_SCHLICK_GGX)
float cNdotH = max(dot(N, H), 0.0); float cLdotH5 = SchlickFresnel(cLdotH);
float cLdotH = max(dot(L, H), 0.0);
float cLdotH5 = SchlickFresnel(cLdotH);
#endif #endif
float Dr = GTR1(cNdotH, mix(.1, .001, clearcoat_gloss)); float Dr = GTR1(cNdotH, mix(.1, .001, clearcoat_gloss));
float Fr = mix(.04, 1.0, cLdotH5); float Fr = mix(.04, 1.0, cLdotH5);
//float Gr = G_GGX_2cos(cNdotL, .25) * G_GGX_2cos(cNdotV, .25); //float Gr = G_GGX_2cos(cNdotL, .25) * G_GGX_2cos(cNdotV, .25);
float Gr = V_GGX(cNdotL, cNdotV, 0.25); float Gr = V_GGX(cNdotL, cNdotV, 0.25);
float clearcoat_specular_brdf_NL = 0.25 * clearcoat * Gr * Fr * Dr * cNdotL; float clearcoat_specular_brdf_NL = 0.25 * clearcoat * Gr * Fr * Dr * cNdotL;
specular_light += clearcoat_specular_brdf_NL * light_color * specular_blob_intensity * attenuation; specular_light += clearcoat_specular_brdf_NL * light_color * specular_blob_intensity * attenuation;
}
#endif #endif
} }

55
drivers/gles3/shaders/scene.glsl
View File

@ -949,6 +949,18 @@ LIGHT_SHADER_CODE
float NdotV = dot(N, V); float NdotV = dot(N, V);
float cNdotV = max(NdotV, 0.0); float cNdotV = max(NdotV, 0.0);
#if defined(DIFFUSE_BURLEY) || defined(SPECULAR_BLINN) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_USE_CLEARCOAT)
vec3 H = normalize(V + L);
#endif
#if defined(SPECULAR_BLINN) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_USE_CLEARCOAT)
float cNdotH = max(dot(N, H), 0.0);
#endif
#if defined(DIFFUSE_BURLEY) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_USE_CLEARCOAT)
float cLdotH = max(dot(L, H), 0.0);
#endif
if (metallic < 1.0) { if (metallic < 1.0) {
#if defined(DIFFUSE_OREN_NAYAR) #if defined(DIFFUSE_OREN_NAYAR)
vec3 diffuse_brdf_NL; vec3 diffuse_brdf_NL;
@ -983,13 +995,9 @@ LIGHT_SHADER_CODE
#elif defined(DIFFUSE_BURLEY) #elif defined(DIFFUSE_BURLEY)
{ {
float FD90_minus_1 = 2.0 * cLdotH * cLdotH * roughness - 0.5;
vec3 H = normalize(V + L); float FdV = 1.0 + FD90_minus_1 * SchlickFresnel(cNdotV);
float cLdotH = max(0.0, dot(L, H)); float FdL = 1.0 + FD90_minus_1 * SchlickFresnel(cNdotL);
float FD90 = 0.5 + 2.0 * cLdotH * cLdotH * roughness;
float FdV = 1.0 + (FD90 - 1.0) * SchlickFresnel(cNdotV);
float FdL = 1.0 + (FD90 - 1.0) * SchlickFresnel(cNdotL);
diffuse_brdf_NL = (1.0 / M_PI) * FdV * FdL * cNdotL; diffuse_brdf_NL = (1.0 / M_PI) * FdV * FdL * cNdotL;
/* /*
float energyBias = mix(roughness, 0.0, 0.5); float energyBias = mix(roughness, 0.0, 0.5);
@ -1026,13 +1034,9 @@ LIGHT_SHADER_CODE
#if defined(SPECULAR_BLINN) #if defined(SPECULAR_BLINN)
//normalized blinn //normalized blinn
vec3 H = normalize(V + L);
float cNdotH = max(dot(N, H), 0.0);
float cVdotH = max(dot(V, H), 0.0);
float cLdotH = max(dot(L, H), 0.0);
float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25; float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25;
float blinn = pow(cNdotH, shininess); float blinn = pow(cNdotH, shininess);
blinn *= (shininess + 8.0) / (8.0 * 3.141592654); blinn *= (shininess + 8.0) * (1.0 / (8.0 * M_PI));
float intensity = (blinn) / max(4.0 * cNdotV * cNdotL, 0.75); float intensity = (blinn) / max(4.0 * cNdotV * cNdotL, 0.75);
specular_light += light_color * intensity * specular_blob_intensity * attenuation; specular_light += light_color * intensity * specular_blob_intensity * attenuation;
@ -1043,7 +1047,7 @@ LIGHT_SHADER_CODE
float cRdotV = max(0.0, dot(R, V)); float cRdotV = max(0.0, dot(R, V));
float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25; float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25;
float phong = pow(cRdotV, shininess); float phong = pow(cRdotV, shininess);
phong *= (shininess + 8.0) / (8.0 * 3.141592654); phong *= (shininess + 8.0) * (1.0 / (8.0 * M_PI));
float intensity = (phong) / max(4.0 * cNdotV * cNdotL, 0.75); float intensity = (phong) / max(4.0 * cNdotV * cNdotL, 0.75);
specular_light += light_color * intensity * specular_blob_intensity * attenuation; specular_light += light_color * intensity * specular_blob_intensity * attenuation;
@ -1063,11 +1067,6 @@ LIGHT_SHADER_CODE
#elif defined(SPECULAR_SCHLICK_GGX) #elif defined(SPECULAR_SCHLICK_GGX)
// shlick+ggx as default // shlick+ggx as default
vec3 H = normalize(V + L);
float cNdotH = max(dot(N, H), 0.0);
float cLdotH = max(dot(L, H), 0.0);
#if defined(LIGHT_USE_ANISOTROPY) #if defined(LIGHT_USE_ANISOTROPY)
float alpha = roughness * roughness; float alpha = roughness * roughness;
@ -1095,23 +1094,17 @@ LIGHT_SHADER_CODE
#endif #endif
#if defined(LIGHT_USE_CLEARCOAT) #if defined(LIGHT_USE_CLEARCOAT)
if (clearcoat_gloss > 0.0) {
#if !defined(SPECULAR_SCHLICK_GGX) && !defined(SPECULAR_BLINN)
vec3 H = normalize(V + L);
#endif
#if !defined(SPECULAR_SCHLICK_GGX) #if !defined(SPECULAR_SCHLICK_GGX)
float cNdotH = max(dot(N, H), 0.0); float cLdotH5 = SchlickFresnel(cLdotH);
float cLdotH = max(dot(L, H), 0.0);
float cLdotH5 = SchlickFresnel(cLdotH);
#endif #endif
float Dr = GTR1(cNdotH, mix(.1, .001, clearcoat_gloss)); float Dr = GTR1(cNdotH, mix(.1, .001, clearcoat_gloss));
float Fr = mix(.04, 1.0, cLdotH5); float Fr = mix(.04, 1.0, cLdotH5);
float Gr = G_GGX_2cos(cNdotL, .25) * G_GGX_2cos(cNdotV, .25); float Gr = G_GGX_2cos(cNdotL, .25) * G_GGX_2cos(cNdotV, .25);
float specular_brdf_NL = 0.25 * clearcoat * Gr * Fr * Dr * cNdotL; float specular_brdf_NL = 0.25 * clearcoat * Gr * Fr * Dr * cNdotL;
specular_light += specular_brdf_NL * light_color * specular_blob_intensity * attenuation; specular_light += specular_brdf_NL * light_color * specular_blob_intensity * attenuation;
}
#endif #endif
} }