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#
# CMakeLists.txt used to build example apps by the CMake build system
#
# Copyright 2020-2024 by Bill Spitzak and others.
#
# This library is free software. Distribution and use rights are outlined in
# the file "COPYING" which should have been included with this file. If this
# file is missing or damaged, see the license at:
#
# https://www.fltk.org/COPYING.php
#
# Please see the following page on how to report bugs and issues:
#
# https://www.fltk.org/bugs.php
#
################################################################################
include(../CMake/fl_create_example.cmake)
include(../CMake/FLTK-Functions.cmake)
set(EXECUTABLE_OUTPUT_PATH ${CMAKE_CURRENT_BINARY_DIR}/../bin/examples)
file(MAKE_DIRECTORY ${EXECUTABLE_OUTPUT_PATH})
################################################################################
# create separate lists of all source (.cxx) files
# depending on the required FLTK and system libraries
############################################################
# simple examples w/o extra libs
############################################################
set(SIMPLE_SOURCES
browser-simple
callbacks
chart-simple
draggable-group
grid-simple
howto-add_fd-and-popen
howto-browser-with-icons
howto-drag-and-drop
howto-draw-an-x
howto-flex-simple
howto-menu-with-images
howto-parse-args
howto-remap-numpad-keyboard-keys
howto-text-over-image-button
menubar-add
nativefilechooser-simple
nativefilechooser-simple-app
progress-simple
shapedwindow
simple-terminal
table-as-container
table-simple
table-sort
table-spreadsheet
table-spreadsheet-with-keyboard-nav
table-with-keynav
table-with-right-column-stretch-fit
table-with-right-click-menu
tabs-simple
textdisplay-with-colors
texteditor-simple
texteditor-with-dynamic-colors
tree-as-container
tree-custom-draw-items
tree-custom-sort
tree-of-tables
tree-simple
wizard-simple
)
############################################################
# simple FLUID examples w/o extra libs
############################################################
set(FLUID_SOURCES
fluid-callback
)
############################################################
# examples requiring fltk::images
############################################################
set(IMAGE_SOURCES
animgifimage
animgifimage-play
animgifimage-resize
animgifimage-simple
howto-simple-svg
)
############################################################
# examples requiring cairo
############################################################
set(CAIRO_SOURCES
cairo-draw-x
)
############################################################
# examples requiring OpenGL3 + GLEW
############################################################
set(OPENGL_SOURCES
OpenGL3-glut-test
OpenGL3test
)
############################################################
# create simple example programs
############################################################
foreach(src ${SIMPLE_SOURCES})
fl_create_example(${src} ${src}.cxx fltk::fltk)
endforeach(src)
############################################################
# create FLUID example programs
############################################################
foreach(src ${FLUID_SOURCES})
fl_create_example(${src} ${src}.fl fltk::fltk)
endforeach(src)
############################################################
# create example programs with fltk_images library
############################################################
foreach(src ${IMAGE_SOURCES})
fl_create_example(${src} ${src}.cxx "fltk::images")
endforeach(src)
############################################################
# create example programs requiring cairo
############################################################
foreach(src ${CAIRO_SOURCES})
fl_create_example(${src} ${src}.cxx fltk::fltk)
endforeach(src)
############################################################
# create example programs with OpenGL3 + GLEW
############################################################
#
# Note 1: macOS (Quartz) does not need GLEW, it's included in OpenGL
# Note 2: find_package(GLEW) finds either shared or static libs or both.
# Note 3: on Windows we set the variable GLEW_USE_STATIC_LIBS=TRUE because
# we *want* to find static libs but we *can* also use shared libs.
# Note 4: FindGLEW.cmake changed the library suffixes for MinGW in CMake 3.28.0,
# obviously "assuming" that ".lib" is Visual Studio only. There have been
# discussions about finding the "wrong" libraries since CMake 3.25 or so.
# Therefore the static lib "glew32s.lib" is not found if CMake 3.28 or
# higher is used (current version, as of this writing: 3.29.3). However,
# this assumption is probably not true for a pure C library (glew32s).
# This library *is* found and works well with CMake 3.15.0 - 3.27.9.
# Users may need to copy or rename "glew32s.lib" to "glew32s.a"
# if CMake 3.28 or higher is used.
# Albrecht-S, May 13, 2024
if(OPENGL_FOUND)
if(WIN32)
set(GLEW_USE_STATIC_LIBS TRUE)
endif()
set(_glew_lib GLEW::glew)
set(_glew_static FALSE)
if(APPLE AND NOT FLTK_BACKEND_X11) # macOS Quartz
set(_glew_lib)
set(GLEW_FOUND TRUE)
else()
# set(GLEW_VERBOSE TRUE) # make `find_package(GLEW)` verbose
set(_CMAKE_PREFIX_PATH_SAVED ${CMAKE_PREFIX_PATH})
set(CMAKE_PREFIX_PATH ${FLTK_GLEW_DIR} ${CMAKE_PREFIX_PATH})
find_package(GLEW MODULE)
set(CMAKE_PREFIX_PATH ${_CMAKE_PREFIX_PATH_SAVED})
unset(_CMAKE_PREFIX_PATH_SAVED)
# Did we find the static lib? If yes, use it
if(TARGET GLEW::glew_s)
set(_glew_lib GLEW::glew_s)
set(_glew_static TRUE)
endif()
endif()
if(0) # Debug
fl_debug_var(OPENGL_FOUND)
fl_debug_var(GLEW_FOUND)
fl_debug_var(GLEW_DIR)
fl_debug_var(_glew_lib)
fl_debug_target(GLEW::glew)
fl_debug_target(GLEW::glew_s)
fl_debug_target(GLEW::GLEW)
endif() # /Debug
endif(OPENGL_FOUND)
if(OPENGL_FOUND AND (TARGET "${_glew_lib}" OR APPLE))
# GLEW was found, create the OpenGL3 targets:
foreach(tgt ${OPENGL_SOURCES})
fl_create_example(${tgt} ${tgt}.cxx "fltk::gl;${_glew_lib}")
set_property(TARGET ${tgt} PROPERTY CXX_STANDARD 11)
set_property(TARGET ${tgt} PROPERTY CXX_STANDARD_REQUIRED TRUE)
# define preprocessor macro GLEW_STATIC only if we link to the static lib
if(_glew_static)
target_compile_definitions(${tgt} PRIVATE "GLEW_STATIC")
endif()
endforeach(tgt)
else()
message(STATUS
"OpenGL or GLEW not present: OpenGL3 example programs will not be built.")
fl_debug_var(OPENGL_FOUND)
fl_debug_var(GLEW_FOUND)
message("")
endif() # (OPENGL_FOUND AND TARGET "${_glew_lib}")
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