SL-18869 Optimizations -- Decruftify LLRenderTarget, use a shader to copy color/depth instead of glCopyTexSubImage or glBlitFrameBuffer

1 files changed, 40 insertions, 0 deletions

diff --git a/indra/newview/app_settings/shaders/class1/interface/copyF.glsl b/indra/newview/app_settings/shaders/class1/interface/copyF.glsl
new file mode 100644
index 0000000000..764bace621
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/interface/copyF.glsl
@@ -0,0 +1,40 @@
+/** 
+ * @file copyF.glsl
+ *
+ * $LicenseInfo:firstyear=2023&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2023, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+in vec2 tc;
+
+uniform sampler2D depthMap;
+uniform sampler2D diffuseMap;
+
+out vec4 frag_color;
+
+void main() 
+{
+    frag_color = texture(diffuseMap, tc);
+#if COPY_DEPTH
+    gl_FragDepth = texture(depthMap, tc).r;
+#endif
+}
+