SL-17703: PBR: Fix albedo being in wrong color space, add support for debug default_irradiance.png

1 files changed, 26 insertions, 0 deletions

diff --git a/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl b/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
index 998ebf8836..56aa8437de 100644
--- a/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
+++ b/indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
@@ -27,6 +27,10 @@
 #define PBR_USE_IBL                1
 #define PBR_USE_SUN                1
 
+#define PBR_USE_LINEAR_ALBEDO      1
+#define PBR_USE_DEFAULT_IRRADIANCE 0 // PBR: irradiance, skins/default/textures/default_irradiance.png
+#define PBR_USE_IRRADIANCE_HACK    1
+
 #define DEBUG_PBR_LIGHT_TYPE       0 // Output no global light to make it easier to see pointLight and spotLight
 #define DEBUG_PBR_PACKORM0         0 // Rough=0, Metal=0
 #define DEBUG_PBR_PACKORM1         0 // Rough=1, Metal=1
@@ -135,6 +139,9 @@ uniform sampler2DRect diffuseRect;
 uniform sampler2DRect specularRect;
 uniform sampler2DRect normalMap;
 uniform sampler2DRect emissiveRect; // PBR linear packed Occlusion, Roughness, Metal. See: pbropaqueF.glsl
+uniform sampler2D altDiffuseMap; // PBR: irradiance, skins/default/textures/default_irradiance.png
+
+const float M_PI = 3.14159265;
 
 #if defined(HAS_SUN_SHADOW) || defined(HAS_SSAO)
 uniform sampler2DRect lightMap;
@@ -295,7 +302,11 @@ void main()
         float bv = clamp(dot(b,v),0,1);
 
         // Reference: getMetallicRoughnessInfo
+#if PBR_USE_LINEAR_ALBEDO
+        vec3  base            = diffuse.rgb;
+#else
         vec3  base            = linear_to_srgb(diffuse.rgb);
+#endif
         float perceptualRough = max(packedORM.g, 0.1);
         vec3 c_diff, reflect0, reflect90;
         float alphaRough, specWeight;
@@ -321,7 +332,14 @@ void main()
 #if DEBUG_PBR_IRRADIANCE_RAW
         vec3 debug_irradiance = irradiance;
 #endif
+
+#if PBR_USE_DEFAULT_IRRADIANCE
+        vec2 iruv  = vec2(0.5f + 0.5f * atan(reflectVN.z, reflectVN.x) / M_PI, 1.f - acos(reflectVN.y) / M_PI);
+        irradiance = texture2D(altDiffuseMap, iruv).rgb * ambocc;
+#endif
+#if PBR_USE_IRRADIANCE_HACK
         irradiance       = max(amblit,irradiance) * ambocc;
+#endif
         specLight        = srgb_to_linear(specLight);
 #if DEBUG_PBR_SPECLIGHT051
         specLight        = vec3(0,0.5,1.0);
@@ -365,8 +383,13 @@ void main()
 #endif
             // scol = sun shadow
             vec3 intensity  = ambocc * sunColor * nl * scol;
+#if PBR_USE_LINEAR_ALBEDO
+            vec3 sunDiffuse = intensity * BRDFLambertian (reflect0, reflect90, c_diff    , specWeight, vh);
+            vec3 sunSpec    = intensity * BRDFSpecularGGX(reflect0, reflect90, alphaRough, specWeight, vh, nl, nv, nh);
+#else
             vec3 sunDiffuse = base * intensity * BRDFLambertian (reflect0, reflect90, c_diff    , specWeight, vh);
             vec3 sunSpec    =        intensity * BRDFSpecularGGX(reflect0, reflect90, alphaRough, specWeight, vh, nl, nv, nh);
+#endif
             bloom = dot(sunSpec, sunSpec) / (scale * scale * scale);
 
     #if DEBUG_PBR_SUN_SPEC_FRESNEL
@@ -577,9 +600,11 @@ void main()
     #endif
     #if DEBUG_PBR_IRRADIANCE_RAW
         color.rgb = debug_irradiance;
+        bloom = 0;
     #endif
     #if DEBUG_PBR_IRRADIANCE
         color.rgb = irradiance;
+        bloom = 0;
     #endif
     #if DEBUG_PBR_KSPEC
         color.rgb = kSpec;
@@ -633,6 +658,7 @@ void main()
     #if DEBUG_PBR_LIGHT_TYPE
         color.rgb = vec3(0);
     #endif
+
         frag_color.rgb = color.rgb; // PBR is done in linear
     }
 else