1 files changed, 61 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/exposureF.glsl b/indra/newview/app_settings/shaders/class1/deferred/exposureF.glsl
new file mode 100644
index 0000000000..9ac4ceb37e
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/deferred/exposureF.glsl
@@ -0,0 +1,61 @@
+/** 
+ * @file exposureF.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
+ * $/LicenseInfo$
+ */
+ 
+/*[EXTRA_CODE_HERE]*/
+
+out vec4 frag_color;
+
+uniform sampler2D emissiveRect;
+uniform sampler2D exposureMap;
+
+uniform float dt;
+uniform vec2 noiseVec;
+
+uniform vec3 dynamic_exposure_params;
+
+float lum(vec3 col)
+{
+    vec3 l = vec3(0.2126, 0.7152, 0.0722);
+    return dot(l, col);
+}
+
+void main() 
+{
+    vec2 tc = vec2(0.5,0.5);
+
+    float L = textureLod(emissiveRect, tc, 8).r;
+    float max_L = dynamic_exposure_params.x;
+    L = clamp(L, 0.0, max_L);
+    L /= max_L;
+    L = pow(L, 2.0);
+    float s = mix(dynamic_exposure_params.z, dynamic_exposure_params.y, L);
+
+    float prev = texture(exposureMap, vec2(0.5,0.5)).r;
+
+    s = mix(prev, s, min(dt*2.0*abs(prev-s), 0.04));
+    
+    frag_color = max(vec4(s, s, s, dt), vec4(0.0));
+}
+