From 53789008221043052360dcff2c1faeb11c64d9f6 Mon Sep 17 00:00:00 2001
From: Graham Linden <graham@lindenlab.com>
Date: Tue, 25 Jun 2013 10:21:59 -0700
Subject: NORSPEC-250 add setting to force higher LUT precision and made LUT
 cleanup match creation

---
 indra/newview/app_settings/settings.xml | 12 ++++++++++++
 indra/newview/pipeline.cpp              | 21 +++++++++++++++++++--
 2 files changed, 31 insertions(+), 2 deletions(-)

(limited to 'indra')

diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 344079b640..ebb01fb330 100755
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -8592,6 +8592,18 @@
     </array>
   </map>
 
+  <key>RenderSpecularPrecision</key>
+  <map>
+    <key>Comment</key>
+    <string>Force 32-bit floating point LUT</string>
+    <key>Persist</key>
+    <integer>1</integer>
+    <key>Type</key>
+    <string>U32</string>
+    <key>Value</key>
+    <real>0</real>
+  </map>
+  
   <key>RenderSpecularResX</key>
   <map>
     <key>Comment</key>
diff --git a/indra/newview/pipeline.cpp b/indra/newview/pipeline.cpp
index 9713f963b9..442b0b6d2d 100755
--- a/indra/newview/pipeline.cpp
+++ b/indra/newview/pipeline.cpp
@@ -1201,7 +1201,15 @@ void LLPipeline::releaseLUTBuffers()
 {
 	if (mLightFunc)
 	{
-		LLImageGL::deleteTextures(LLTexUnit::TT_TEXTURE, GL_R16F, 0, 1, &mLightFunc);
+		U32 use_high_precision = gSavedSettings.getU32("RenderSpecularPrecision");
+
+		U32 pix_format = use_high_precision ? GL_R32F : GL_R16F;
+
+#if LL_DARWIN
+		pix_format = GL_R32F;
+#endif
+
+		LLImageGL::deleteTextures(LLTexUnit::TT_TEXTURE, pix_format, 0, 1, &mLightFunc);
 		mLightFunc = 0;
 	}
 }
@@ -1402,7 +1410,16 @@ void LLPipeline::createLUTBuffers()
 			}
 			// Need to work around limited precision with 10.6.8 and older drivers
 			//
-			U32 pix_format = GL_R32F;
+			U32 use_high_precision = gSavedSettings.getU32("RenderSpecularPrecision");
+				
+			U32 pix_format = use_high_precision ? GL_R32F : GL_R16F;
+
+#if LL_DARWIN
+			// Forced to work around 10.6.8. driver bugs on most every GPU
+			//
+			pix_format = GL_R32F;
+#endif
+
 			LLImageGL::generateTextures(LLTexUnit::TT_TEXTURE, pix_format, 1, &mLightFunc);
 			gGL.getTexUnit(0)->bindManual(LLTexUnit::TT_TEXTURE, mLightFunc);
 			LLImageGL::setManualImage(LLTexUnit::getInternalType(LLTexUnit::TT_TEXTURE), 0, pix_format, lightResX, lightResY, GL_RED, GL_FLOAT, ls, false);
-- 
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