# Copyright (c) 2022, ETH Zurich and UNC Chapel Hill.
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# Author: Johannes L. Schoenberger (jsch-at-demuc-dot-de)

# Find package module for Glew library.
#
# The following variables are set by this module:
#
#   GLEW_FOUND: TRUE if Glew is found.
#   GLEW_INCLUDE_DIRS: Include directories for Glew.
#   GLEW_LIBRARIES: Libraries required to link Glew.
#
# The following variables control the behavior of this module:
#
# GLEW_INCLUDE_DIR_HINTS: List of additional directories in which to
#                         search for Glew includes.
# GLEW_LIBRARY_DIR_HINTS: List of additional directories in which to
#                         search for Glew libraries.

set(GLEW_INCLUDE_DIR_HINTS "" CACHE PATH "Glew include directory")
set(GLEW_LIBRARY_DIR_HINTS "" CACHE PATH "Glew library directory")

unset(GLEW_FOUND)
unset(GLEW_INCLUDE_DIRS)
unset(GLEW_LIBRARIES)

find_path(GLEW_INCLUDE_DIRS
    NAMES
    GL/glew.h
    PATHS
    ${GLEW_INCLUDE_DIR_HINTS}
    /usr/include
    /usr/local/include
    /sw/include
    /opt/include
    /opt/local/include)
find_library(GLEW_LIBRARIES
    NAMES
    GLEW
    Glew
    glew
    glew32
    PATHS
    ${GLEW_LIBRARY_DIR_HINTS}
    /usr/lib64
    /usr/lib
    /usr/local/lib64
    /usr/local/lib
    /sw/lib
    /opt/lib
    /opt/local/lib)

if(GLEW_INCLUDE_DIRS AND GLEW_LIBRARIES)
    set(GLEW_FOUND TRUE)
    message(STATUS "Found Glew")
    message(STATUS "  Includes : ${GLEW_INCLUDE_DIRS}")
    message(STATUS "  Libraries : ${GLEW_LIBRARIES}")
else()
    set(GLEW_FOUND FALSE)
    if(Glew_FIND_REQUIRED)
        message(FATAL_ERROR "Could not find Glew")
    endif()
endif()