WIP - switch PBR implementations

1 files changed, 34 insertions, 63 deletions

diff --git a/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
index 1a7e11a1cd..6dd140bff3 100644
--- a/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
@@ -89,34 +89,21 @@ vec4 applyWaterFogView(vec3 pos, vec4 color);
 #endif
 
 // PBR interface
-void calcHalfVectors(vec3 lv, vec3 n, vec3 v, out vec3 h, out vec3 l, out float nh, out float nl, out float nv, out float vh, out float lightDist);
-void initMaterial( vec3 diffuse, vec3 packedORM,
-        out float alphaRough, out vec3 c_diff, out vec3 reflect0, out vec3 reflect90, out float specWeight );
-// perform PBR image based lighting according to GLTF spec
-// all parameters are in linear space
-void pbrIbl(out vec3 colorDiffuse, // diffuse color output
-            out vec3 colorSpec, // specular color output,
+vec3 pbrIbl(vec3 diffuseColor,
+            vec3 specularColor,
             vec3 radiance, // radiance map sample
             vec3 irradiance, // irradiance map sample
             float ao,       // ambient occlusion factor
-            float nv,
-            float perceptualRough, // roughness factor
-            float gloss,        // 1.0 - roughness factor
-            vec3 reflect0,
-            vec3 c_diff);
-
-void pbrDirectionalLight(inout vec3 colorDiffuse,
-    inout vec3 colorSpec,
-    vec3 sunlit,
-    float scol,
-    vec3 reflect0,
-    vec3 reflect90,
-    vec3 c_diff,
-    float alphaRough,
-    float vh,
-    float nl,
-    float nv,
-    float nh);
+            float nv,       // normal dot view vector
+            float perceptualRoughness);
+
+vec3 pbrPunctual(vec3 diffuseColor, vec3 specularColor, 
+                    float perceptualRoughness, 
+                    float metallic,
+                    vec3 n, // normal
+                    vec3 v, // surface point to camera
+                    vec3 l); //surface point to light
+
 
 void main()
 {
@@ -160,51 +147,34 @@ void main()
     bool hasPBR = GET_GBUFFER_FLAG(GBUFFER_FLAG_HAS_PBR);
     if (hasPBR)
     {
-        // 5.22.2. material.pbrMetallicRoughness.baseColorTexture
-        // The first three components (RGB) MUST be encoded with the sRGB transfer function.
-        //
-        // 5.19.7. material.emissiveTexture
-        // This texture contains RGB components encoded with the sRGB transfer function.
-        //
-        // 5.22.5. material.pbrMetallicRoughness.metallicRoughnessTexture
-        // These values MUST be encoded with a linear transfer function.
-
-        vec3 colorDiffuse      = vec3(0);
-        vec3 colorEmissive     = spec.rgb; // PBR sRGB Emissive.  See: pbropaqueF.glsl
-        vec3 colorSpec         = vec3(0);
-
-        vec3 packedORM        = texture2DRect(emissiveRect, tc).rgb; // PBR linear packed Occlusion, Roughness, Metal. See: pbropaqueF.glsl
-        float IOR             = 1.5;         // default Index Of Refraction 1.5 (dielectrics)
-        float ao         = packedORM.r;
-        float metal      = packedORM.b;
-        vec3  v          = -normalize(pos.xyz);
-        vec3  n          = norm.xyz;
-
-        vec3  h, l;
-        float nh, nl, nv, vh, lightDist;
-        calcHalfVectors(light_dir, n, v, h, l, nh, nl, nv, vh, lightDist);
-
-        float perceptualRough = packedORM.g;  // NOTE: do NOT clamp here to be consistent with Blender, Blender is wrong and Substance is right
-        
-        vec3 c_diff, reflect0, reflect90;
-        float alphaRough, specWeight;
-        initMaterial( diffuse.rgb, packedORM, alphaRough, c_diff, reflect0, reflect90, specWeight );
+        vec3 orm = texture2DRect(emissiveRect, tc).rgb; //orm is packed into "emissiveRect" to keep the data in linear color space
+        float perceptualRoughness = orm.g;
+        float metallic = orm.b;
+        float ao = orm.r * ambocc;
 
-        float gloss      = 1.0 - perceptualRough;
+        vec3 colorEmissive = texture2DRect(specularRect, tc).rgb; //specularRect is sRGB sampler, result is in linear space
+
+        // PBR IBL
+        float gloss      = 1.0 - perceptualRoughness;
         vec3  irradiance = vec3(0);
         vec3  radiance  = vec3(0);
         sampleReflectionProbes(irradiance, radiance, legacyenv, pos.xyz, norm.xyz, gloss, 0.0);
-        irradiance       = max(amblit,irradiance) * ambocc;
+        irradiance       = max(srgb_to_linear(amblit),irradiance) * ambocc*4.0;
 
-        pbrIbl(colorDiffuse, colorSpec, radiance, irradiance, ao, nv, perceptualRough, gloss, reflect0, c_diff);
+        vec3 f0 = vec3(0.04);
+        vec3 baseColor = diffuse.rgb;
         
-        // Add in sun/moon punctual light
-        if (nl > 0.0 || nv > 0.0)
-        {
-            pbrDirectionalLight(colorDiffuse, colorSpec, srgb_to_linear(sunlit), scol, reflect0, reflect90, c_diff, alphaRough, vh, nl, nv, nh);
-        }
+        vec3 diffuseColor = baseColor.rgb*(vec3(1.0)-f0);
+        diffuseColor *= 1.0 - metallic;
+
+        vec3 specularColor = mix(f0, baseColor.rgb, metallic);
 
-        color.rgb = colorDiffuse + colorEmissive + colorSpec;
+        vec3 v = -normalize(pos.xyz);
+        float NdotV = clamp(abs(dot(norm.xyz, v)), 0.001, 1.0);
+        
+        color.rgb += pbrIbl(diffuseColor, specularColor, radiance, irradiance, ao, NdotV, perceptualRoughness);
+        color.rgb += pbrPunctual(diffuseColor, specularColor, perceptualRoughness, metallic, norm.xyz, v, normalize(light_dir)) * sunlit*8.0 * scol;
+        color.rgb += colorEmissive;
 
         color  = linear_to_srgb(color);
         color *= atten.r;
@@ -212,6 +182,7 @@ void main()
         color  = scaleSoftClipFrag(color);
         color  = srgb_to_linear(color);
 
+
         frag_color.rgb = color.rgb; //output linear since local lights will be added to this shader's results
     }
     else