[Bf-blender-cvs] [2087b878078] blender-v2.83-release: Fix T77641 Sculpt mode performance regression in 2.83

[Clément Foucault]

Commit: 2087b878078bf16f212e9bce48c05b4456b90d96
Author: Clément Foucault
Date:   Wed Jul 1 02:10:10 2020 +0200
Branches: blender-v2.83-release
https://developer.blender.org/rB2087b878078bf16f212e9bce48c05b4456b90d96

Fix T77641 Sculpt mode performance regression in 2.83

===================================================================

M	source/blender/gpu/intern/gpu_extensions.c

===================================================================

diff --git a/source/blender/gpu/intern/gpu_extensions.c b/source/blender/gpu/intern/gpu_extensions.c
index 19b4ea5bf4b..7b0825a2d8e 100644
--- a/source/blender/gpu/intern/gpu_extensions.c
+++ b/source/blender/gpu/intern/gpu_extensions.c
@@ -295,6 +295,12 @@ void gpu_extensions_init(void)
     GG.broken_amd_driver = true;
   }
 
+  if (GPU_type_matches(GPU_DEVICE_ATI, GPU_OS_UNIX, GPU_DRIVER_OPENSOURCE) &&
+      strstr(version, "Mesa 19.3.4")) {
+    /* Fix slowdown on this particular driver. (see T77641) */
+    GG.broken_amd_driver = true;
+  }
+
   if (GPU_type_matches(GPU_DEVICE_ATI, GPU_OS_MAC, GPU_DRIVER_OFFICIAL)) {
     if (strstr(renderer, "AMD Radeon Pro") || strstr(renderer, "AMD Radeon R9") ||
         strstr(renderer, "AMD Radeon RX")) {