Removing out gl_FragDepth as nvidia driver complains about it.

CMakeLists.txt

@@ -56,8 +56,8 @@ ADD_DEFINITIONS(-DNO_SPACE_NAVIGATOR_SUPPORT)
 SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -DSAXUM_DEBUG -g")
 SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS} -DSAXUM_DEBUG -g")
 
-SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O2 -DNDEBUG")
-SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS} -O2 -DNDEBUG")
+SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -DNDEBUG")
+SET(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS} -DNDEBUG")
 
 set(dir ${CMAKE_CURRENT_SOURCE_DIR}/binaries)
 set(EXECUTABLE_OUTPUT_PATH ${dir} CACHE PATH "Build directory" FORCE)

data/shader/depth.fsh

@@ -1,7 +1,5 @@
 #version 150
 
-out float gl_FragDepth;
-
 void main() {
     gl_FragDepth = gl_FragCoord.z;
 }

data/shader/depth_cube.fsh

@@ -4,8 +4,6 @@ in vec4 fragPosition;
 
 uniform float farPlane;
 
-out float gl_FragDepth;
-
 void main() {
     float nearPlane = 0.1;
     float A = -(farPlane+nearPlane)/(farPlane-nearPlane);