From e09475713b7abe6fcb916f4a770081a1696b57ab Mon Sep 17 00:00:00 2001
From: RunitaiLinden <davep@lindenlab.com>
Date: Tue, 2 May 2023 18:47:21 -0500
Subject: DRTVWR-559 Optimization pass, make it so profileAvatar can read back
 GPU timer without a frame stall.

---
 indra/llrender/llglslshader.cpp | 72 ++++++++++++++++++++++++++++-------------
 1 file changed, 50 insertions(+), 22 deletions(-)

(limited to 'indra/llrender/llglslshader.cpp')

diff --git a/indra/llrender/llglslshader.cpp b/indra/llrender/llglslshader.cpp
index 04ac2476a7..b7f08aa9af 100644
--- a/indra/llrender/llglslshader.cpp
+++ b/indra/llrender/llglslshader.cpp
@@ -243,9 +243,9 @@ void LLGLSLShader::stopProfile()
     }
 }
 
-void LLGLSLShader::placeProfileQuery()
+void LLGLSLShader::placeProfileQuery(bool for_runtime)
 {
-    if (sProfileEnabled)
+    if (sProfileEnabled || for_runtime)
     {
         if (mTimerQuery == 0)
         {
@@ -254,42 +254,70 @@ void LLGLSLShader::placeProfileQuery()
             glGenQueries(1, &mPrimitivesQuery);
         }
 
-        glBeginQuery(GL_SAMPLES_PASSED, mSamplesQuery);
         glBeginQuery(GL_TIME_ELAPSED, mTimerQuery);
-        glBeginQuery(GL_PRIMITIVES_GENERATED, mPrimitivesQuery);
+
+        if (!for_runtime)
+        {
+            glBeginQuery(GL_SAMPLES_PASSED, mSamplesQuery);
+            glBeginQuery(GL_PRIMITIVES_GENERATED, mPrimitivesQuery);
+        }
     }
 }
 
-void LLGLSLShader::readProfileQuery()
+bool LLGLSLShader::readProfileQuery(bool for_runtime, bool force_read)
 {
-    if (sProfileEnabled)
+    if (sProfileEnabled || for_runtime)
     {
-        glEndQuery(GL_TIME_ELAPSED);
-        glEndQuery(GL_SAMPLES_PASSED);
-        glEndQuery(GL_PRIMITIVES_GENERATED);
+        if (!mProfilePending)
+        {
+            glEndQuery(GL_TIME_ELAPSED);
+            if (!for_runtime)
+            {
+                glEndQuery(GL_SAMPLES_PASSED);
+                glEndQuery(GL_PRIMITIVES_GENERATED);
+            }
+            mProfilePending = for_runtime;
+        }
+
+        if (mProfilePending && for_runtime && !force_read)
+        {
+            GLuint64 result = 0;
+            glGetQueryObjectui64v(mTimerQuery, GL_QUERY_RESULT_AVAILABLE, &result);
+
+            if (result != GL_TRUE)
+            {
+                return false;
+            }
+        }
 
         GLuint64 time_elapsed = 0;
         glGetQueryObjectui64v(mTimerQuery, GL_QUERY_RESULT, &time_elapsed);
+        mTimeElapsed += time_elapsed;
+        mProfilePending = false;
 
-        GLuint64 samples_passed = 0;
-        glGetQueryObjectui64v(mSamplesQuery, GL_QUERY_RESULT, &samples_passed);
+        if (!for_runtime)
+        {
+            GLuint64 samples_passed = 0;
+            glGetQueryObjectui64v(mSamplesQuery, GL_QUERY_RESULT, &samples_passed);
 
-        U64 primitives_generated = 0;
-        glGetQueryObjectui64v(mPrimitivesQuery, GL_QUERY_RESULT, &primitives_generated);
-        sTotalTimeElapsed += time_elapsed;
-        mTimeElapsed += time_elapsed;
+            U64 primitives_generated = 0;
+            glGetQueryObjectui64v(mPrimitivesQuery, GL_QUERY_RESULT, &primitives_generated);
+            sTotalTimeElapsed += time_elapsed;
 
-        sTotalSamplesDrawn += samples_passed;
-        mSamplesDrawn += samples_passed;
+            sTotalSamplesDrawn += samples_passed;
+            mSamplesDrawn += samples_passed;
 
-        U32 tri_count = (U32)primitives_generated / 3;
+            U32 tri_count = (U32)primitives_generated / 3;
 
-        mTrianglesDrawn += tri_count;
-        sTotalTrianglesDrawn += tri_count;
+            mTrianglesDrawn += tri_count;
+            sTotalTrianglesDrawn += tri_count;
 
-        sTotalBinds++;
-        mBinds++;
+            sTotalBinds++;
+            mBinds++;
+        }
     }
+
+    return true;
 }
 
 
-- 
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