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-rw-r--r--src/opengl/util/composition_mode_screen.glsl6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/opengl/util/composition_mode_screen.glsl b/src/opengl/util/composition_mode_screen.glsl
new file mode 100644
index 0000000000..8f4f010032
--- /dev/null
+++ b/src/opengl/util/composition_mode_screen.glsl
@@ -0,0 +1,6 @@
+// Dca' = Sca + Dca - Sca.Dca
+// Da' = Sa + Da - Sa.Da
+vec4 composite(vec4 src, vec4 dst)
+{
+ return src + dst - src * dst;
+}