diff options
| -rw-r--r-- | drivers/gles3/shaders/scene.glsl | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/gles3/shaders/scene.glsl b/drivers/gles3/shaders/scene.glsl index 5c7cfecf3e..507d15f678 100644 --- a/drivers/gles3/shaders/scene.glsl +++ b/drivers/gles3/shaders/scene.glsl @@ -1944,18 +1944,19 @@ FRAGMENT_SHADER_CODE //simplify for toon, as specular_light *= specular * metallic * albedo * 2.0; #else - //brdf approximation (Lazarov 2013) - float ndotv = clamp(dot(normal,eye_vec),0.0,1.0); - vec3 dielectric = vec3(0.034) * specular * 2.0; //energy conservation - vec3 f0 = mix(dielectric, albedo, metallic); + vec3 dielectric = vec3(0.034) * specular * 2.0; + vec3 specular_color = mix(dielectric, albedo, metallic); + // Environment brdf approximation (Lazarov 2013) + // see https://www.unrealengine.com/en-US/blog/physically-based-shading-on-mobile const vec4 c0 = vec4(-1.0, -0.0275, -0.572, 0.022); const vec4 c1 = vec4( 1.0, 0.0425, 1.04, -0.04); vec4 r = roughness * c0 + c1; + float ndotv = clamp(dot(normal,eye_vec),0.0,1.0); float a004 = min( r.x * r.x, exp2( -9.28 * ndotv ) ) * r.x + r.y; - vec2 brdf = vec2( -1.04, 1.04 ) * a004 + r.zw; + vec2 AB = vec2( -1.04, 1.04 ) * a004 + r.zw; - specular_light *= min(1.0,50.0 * f0.g) * brdf.y + brdf.x * f0; + specular_light *= AB.x * specular_color + AB.y; #endif } |