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OpenGL not mandatory

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This commit is contained in:
Krishna Vedala
2020-07-07 09:48:17 -04:00
parent ded46a2fd8
commit e56539ea73
2 changed files with 42 additions and 31 deletions
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68
graphics/CMakeLists.txt
View File

@@ -1,24 +1,28 @@
find_package(OpenGL REQUIRED)
find_package(GLUT)
if(NOT GLUT_FOUND)
message("FreeGLUT library will be downloaded and built.")
include(ExternalProject)
# Include GLFW
ExternalProject_Add (
FREEGLUT
URL https://sourceforge.net/projects/freeglut/files/freeglut/3.2.1/freeglut-3.2.1.tar.gz
URL_MD5 cd5c670c1086358598a6d4a9d166949d
CMAKE_ARGS -DCMAKE_BUILD_TYPE=RelWithDebInfo
-DFREEGLUT_BUILD_SHARED_LIBS=ON
-DFREEGLUT_BUILD_STATIC_LIBS=ON
-DFREEGLUT_BUILD_DEMOS=OFF
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/freeglut
BUILD_IN_SOURCE ON
INSTALL_COMMAND ""
)
ExternalProject_Get_Property(FREEGLUT SOURCE_DIR)
set(FREEGLUT_DIR ${SOURCE_DIR})
endif(NOT GLUT_FOUND)
find_package(OpenGL)
if(OpenGL_FOUND)
find_package(GLUT)
if(NOT GLUT_FOUND)
message("FreeGLUT library will be downloaded and built.")
include(ExternalProject)
# Include GLFW
ExternalProject_Add (
FREEGLUT
URL https://sourceforge.net/projects/freeglut/files/freeglut/3.2.1/freeglut-3.2.1.tar.gz
URL_MD5 cd5c670c1086358598a6d4a9d166949d
CMAKE_ARGS -DCMAKE_BUILD_TYPE=RelWithDebInfo
-DFREEGLUT_BUILD_SHARED_LIBS=ON
-DFREEGLUT_BUILD_STATIC_LIBS=ON
-DFREEGLUT_BUILD_DEMOS=OFF
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/freeglut
BUILD_IN_SOURCE ON
INSTALL_COMMAND ""
)
ExternalProject_Get_Property(FREEGLUT SOURCE_DIR)
set(FREEGLUT_DIR ${SOURCE_DIR})
endif(NOT GLUT_FOUND)
else(OpenGL_FOUND)
message(WARNING "OPENGL not found. Will not build graphical outputs.")
endif(OpenGL_FOUND)
# If necessary, use the RELATIVE flag, otherwise each source file may be listed
# with full pathname. RELATIVE may makes it easier to extract an executable name
@@ -36,15 +40,19 @@ foreach( testsourcefile ${APP_SOURCES} )
target_link_libraries(${testname} PRIVATE OpenMP::OpenMP_CXX)
endif()
if(NOT GLUT_FOUND)
add_dependencies(${testname} FREEGLUT)
target_include_directories(${testname} PRIVATE ${FREEGLUT_DIR}/include)
target_link_directories(${testname} PRIVATE ${FREEGLUT_DIR}/lib)
target_link_libraries(${testname} PRIVATE freeglut OpenGL::GL)
else()
target_include_directories(${testname} PRIVATE ${GLUT_INCLUDE_DIRS})
target_link_libraries(${testname} PRIVATE OpenGL::GL ${GLUT_LIBRARIES})
endif()
if(OpenGL_FOUND)
if(NOT GLUT_FOUND)
add_dependencies(${testname} FREEGLUT)
target_include_directories(${testname} PRIVATE ${FREEGLUT_DIR}/include)
target_link_directories(${testname} PRIVATE ${FREEGLUT_DIR}/lib)
target_link_libraries(${testname} PRIVATE freeglut OpenGL::GL)
else()
target_include_directories(${testname} PRIVATE ${GLUT_INCLUDE_DIRS})
target_link_libraries(${testname} PRIVATE OpenGL::GL ${GLUT_LIBRARIES})
endif()
else(OpenGL_FOUND)
target_compile_options(${testname} NO_OPENGL)
endif(OpenGL_FOUND)
if(APPLE)
target_compile_options(${testname} PRIVATE -Wno-deprecated)

5
graphics/spirograph.cpp
View File

@@ -112,6 +112,7 @@ void test() {
fp.close();
}
#ifndef NO_OPENGL
/** A wrapper that is not available in all GLUT implementations.
*/
static inline void glutBitmapString(void *font, char *message) {
@@ -211,13 +212,14 @@ void timer_cb(int t) {
glutTimerFunc(25, timer_cb, 0);
glutPostRedisplay();
}
#endif
} // namespace spirograph
/** Main function */
int main(int argc, char **argv) {
spirograph::test();
#ifndef NO_OPENGL
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutCreateWindow("Spirograph");
@@ -226,6 +228,7 @@ int main(int argc, char **argv) {
glutTimerFunc(25, spirograph::timer_cb, 0);
glutDisplayFunc(spirograph::test2);
glutMainLoop();
#endif
return 0;
}