While perusing the main CMakeLists.txt file I came across the chunk below.
In the 1st test it looks like GL3 should be GLES3. But I might be wrong...
# Map the OSG_GL*_AVAILABLE settings to OSG_GL_* settings
IF (OSG_GLES2_AVAILABLE OR OSG_GL3_AVAILABLE)
OPTION(OSG_GL_DISPLAYLISTS_AVAILABLE "Set to OFF to disable use of OpenGL
display lists." OFF)
OPTION(OSG_GL_MATRICES_AVAILABLE "Set to OFF to disable use of OpenGL
built-in matrices." OFF)
OPTION(OSG_GL_VERTEX_FUNCS_AVAILABLE "Set to OFF to disable use of OpenGL
vertex functions such as glVertex/glColor etc." OFF)
OPTION(OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE "Set to OFF to disable use of
OpenGL vertex functions such as glVertexPointer/glColorPointer etc." OFF)
OPTION(OSG_GL_FIXED_FUNCTION_AVAILABLE "Set to OFF to disable use of OpenGL
fixed function pipeline." OFF)
ELSEIF (OSG_GLES1_AVAILABLE)
OPTION(OSG_GL_DISPLAYLISTS_AVAILABLE "Set to OFF to disable use of OpenGL
display lists." OFF)
OPTION(OSG_GL_MATRICES_AVAILABLE "Set to OFF to disable use of OpenGL
built-in matrices." ON)
OPTION(OSG_GL_VERTEX_FUNCS_AVAILABLE "Set to OFF to disable use of OpenGL
vertex functions such as glVertex/glColor etc." ON)
OPTION(OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE "Set to OFF to disable use of
OpenGL vertex functions such as glVertexPointer/glColorPointer etc." ON)
OPTION(OSG_GL_FIXED_FUNCTION_AVAILABLE "Set to OFF to disable use of OpenGL
fixed function pipeline." ON)
ELSE()
OPTION(OSG_GL_DISPLAYLISTS_AVAILABLE "Set to OFF to disable use of OpenGL
display lists." ON)
OPTION(OSG_GL_MATRICES_AVAILABLE "Set to OFF to disable use of OpenGL
built-in matrices." ON)
OPTION(OSG_GL_VERTEX_FUNCS_AVAILABLE "Set to OFF to disable use of OpenGL
vertex functions such as glVertex/glColor etc." ON)
OPTION(OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE "Set to OFF to disable use of
OpenGL vertex functions such as glVertexPointer/glColorPointer etc." ON)
OPTION(OSG_GL_FIXED_FUNCTION_AVAILABLE "Set to OFF to disable use of OpenGL
fixed function pipeline." ON)
ENDIF()_______________________________________________
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