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-rw-r--r--src/datavisualization/engine/shaders/surfaceFlat.frag6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/datavisualization/engine/shaders/surfaceFlat.frag b/src/datavisualization/engine/shaders/surfaceFlat.frag
index a8a3dbb1..1f2a3822 100644
--- a/src/datavisualization/engine/shaders/surfaceFlat.frag
+++ b/src/datavisualization/engine/shaders/surfaceFlat.frag
@@ -1,8 +1,10 @@
-#version 150
+#version 120
+
+#extension GL_EXT_gpu_shader4 : require
varying highp vec3 coords_mdl;
varying highp vec3 position_wrld;
-flat in highp vec3 normal_cmr;
+flat varying highp vec3 normal_cmr;
varying highp vec3 eyeDirection_cmr;
varying highp vec3 lightDirection_cmr;