SL-19239 Redo integration of Sascha's radiance map filter.

indra/newview/app_settings/shaders/class1/interface/radianceGenF.glsl

@@ -127,14 +127,11 @@ vec4 prefilterEnvMap(vec3 R)
 	vec3 V = R;
 	vec4 color = vec4(0.0);
 	float totalWeight = 0.0;
-	float envMapDim = u_width;
-    int numSamples = 4;
-    
-    float numMips = max_probe_lod;
+	float envMapDim = float(textureSize(reflectionProbes, 0).s);
+    float roughness = mipLevel/max_probe_lod;
+    int numSamples = max(int(32*roughness), 1);
 
-    float roughness = mipLevel/numMips;
-
-    numSamples = max(int(numSamples*roughness), 1);
+    float numMips = max_probe_lod+1;
 
 	for(uint i = 0u; i < numSamples; i++) {
 		vec2 Xi = hammersley2d(i, numSamples);
@@ -154,11 +151,9 @@ vec4 prefilterEnvMap(vec3 R)
 			// Solid angle of 1 pixel across all cube faces
 			float omegaP = 4.0 * PI / (6.0 * envMapDim * envMapDim);
 			// Biased (+1.0) mip level for better result
-			float mip = roughness == 0.0 ? 0.0 : clamp(0.5 * log2(omegaS / omegaP) + 1.0, 0.0f, numMips);
-            //float mip = clamp(0.5 * log2(omegaS / omegaP) + 1.0, 0.0f, 7.f);
-			color += textureLod(reflectionProbes, vec4(L,sourceIdx), mip) * dotNL;
+			float mipLevel = roughness == 0.0 ? 0.0 : max(0.5 * log2(omegaS / omegaP) + 1.0, 0.0f);
+			color += textureLod(reflectionProbes, vec4(L, sourceIdx), mipLevel) * dotNL;
 			totalWeight += dotNL;
-
 		}
 	}
 	return (color / totalWeight);

indra/newview/llreflectionmapmanager.cpp

@@ -94,7 +94,7 @@ void LLReflectionMapManager::update()
 
     if (!mRenderTarget.isComplete())
     {
-        U32 color_fmt = GL_RGB16F;
+        U32 color_fmt = GL_RGB16;
         U32 targetRes = mProbeResolution * 2; // super sample
         mRenderTarget.allocate(targetRes, targetRes, color_fmt, true);
     }
@@ -107,7 +107,7 @@ void LLReflectionMapManager::update()
         mMipChain.resize(count);
         for (int i = 0; i < count; ++i)
         {
-            mMipChain[i].allocate(res, res, GL_RGBA16F);
+            mMipChain[i].allocate(res, res, GL_RGBA16);
             res /= 2;
         }
     }