Create project (does not yet display image)
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commit
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build
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cmake_minimum_required(VERSION 3.9)
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project(OpengGL_OpenCV_Example)
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_VERBOSE_MAKEFILE ON)
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set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake-modules)
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find_package(OpenCV HINTS /usr/local/opt/opencv /usr/local/Cellar/opencv REQUIRED)
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set( NAME_SRC
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main.cpp
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)
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set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)
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add_executable( opengl_opencv_example ${NAME_SRC} ${NAME_HEADERS} )
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target_link_libraries(opengl_opencv_example GL GLU glut ${OpenCV_LIBS} )
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MIT License
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Copyright (c) 2024 Matthew McWilliams
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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# OpenGL + OpenCV Example
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Compile the project.
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```bash
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bash compile.sh
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```
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Run the binary.
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```bash
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./build/bin/opengl_opencv_example
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```
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# ===================================================================================
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# The OpenCV CMake configuration file
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#
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# ** File generated automatically, do not modify **
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#
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# Usage from an external project:
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# In your CMakeLists.txt, add these lines:
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#
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# FIND_PACKAGE(OpenCV REQUIRED)
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# TARGET_LINK_LIBRARIES(MY_TARGET_NAME ${OpenCV_LIBS})
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#
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# Or you can search for specific OpenCV modules:
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#
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# FIND_PACKAGE(OpenCV REQUIRED core imgcodecs)
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#
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# If the module is found then OPENCV_<MODULE>_FOUND is set to TRUE.
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#
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# This file will define the following variables:
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# - OpenCV_LIBS : The list of libraries to link against.
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# - OpenCV_LIB_DIR : The directory(es) where lib files are. Calling LINK_DIRECTORIES
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# with this path is NOT needed.
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# - OpenCV_INCLUDE_DIRS : The OpenCV include directories.
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# - OpenCV_COMPUTE_CAPABILITIES : The version of compute capability
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# - OpenCV_ANDROID_NATIVE_API_LEVEL : Minimum required level of Android API
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# - OpenCV_VERSION : The version of this OpenCV build. Example: "2.4.0"
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# - OpenCV_VERSION_MAJOR : Major version part of OpenCV_VERSION. Example: "2"
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# - OpenCV_VERSION_MINOR : Minor version part of OpenCV_VERSION. Example: "4"
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# - OpenCV_VERSION_PATCH : Patch version part of OpenCV_VERSION. Example: "0"
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#
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# Advanced variables:
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# - OpenCV_SHARED
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# - OpenCV_CONFIG_PATH
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# - OpenCV_LIB_COMPONENTS
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#
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# ===================================================================================
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#
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# Windows pack specific options:
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# - OpenCV_STATIC
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# - OpenCV_CUDA
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if(CMAKE_VERSION VERSION_GREATER 2.6)
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get_property(OpenCV_LANGUAGES GLOBAL PROPERTY ENABLED_LANGUAGES)
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if(NOT ";${OpenCV_LANGUAGES};" MATCHES ";CXX;")
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enable_language(CXX)
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endif()
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endif()
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if(NOT DEFINED OpenCV_STATIC)
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# look for global setting
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if(BUILD_SHARED_LIBS)
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set(OpenCV_STATIC OFF)
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else()
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set(OpenCV_STATIC ON)
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endif()
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endif()
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if(NOT DEFINED OpenCV_CUDA)
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# if user' app uses CUDA, then it probably wants CUDA-enabled OpenCV binaries
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if(CUDA_FOUND)
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set(OpenCV_CUDA ON)
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endif()
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endif()
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if(MSVC)
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if(CMAKE_CL_64)
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set(OpenCV_ARCH x64)
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set(OpenCV_TBB_ARCH intel64)
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elseif((CMAKE_GENERATOR MATCHES "ARM") OR ("${arch_hint}" STREQUAL "ARM") OR (CMAKE_VS_EFFECTIVE_PLATFORMS MATCHES "ARM|arm"))
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# see Modules/CmakeGenericSystem.cmake
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set(OpenCV_ARCH ARM)
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else()
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set(OpenCV_ARCH x86)
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set(OpenCV_TBB_ARCH ia32)
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endif()
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if(MSVC_VERSION EQUAL 1400)
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set(OpenCV_RUNTIME vc8)
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elseif(MSVC_VERSION EQUAL 1500)
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set(OpenCV_RUNTIME vc9)
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elseif(MSVC_VERSION EQUAL 1600)
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set(OpenCV_RUNTIME vc10)
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elseif(MSVC_VERSION EQUAL 1700)
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set(OpenCV_RUNTIME vc11)
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elseif(MSVC_VERSION EQUAL 1800)
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set(OpenCV_RUNTIME vc12)
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elseif(MSVC_VERSION EQUAL 1900)
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set(OpenCV_RUNTIME vc14)
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endif()
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elseif(MINGW)
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set(OpenCV_RUNTIME mingw)
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execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpmachine
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OUTPUT_VARIABLE OPENCV_GCC_TARGET_MACHINE
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OUTPUT_STRIP_TRAILING_WHITESPACE)
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if(OPENCV_GCC_TARGET_MACHINE MATCHES "amd64|x86_64|AMD64")
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set(MINGW64 1)
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set(OpenCV_ARCH x64)
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else()
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set(OpenCV_ARCH x86)
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endif()
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endif()
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if(CMAKE_VERSION VERSION_GREATER 2.6.2)
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unset(OpenCV_CONFIG_PATH CACHE)
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endif()
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if(NOT OpenCV_FIND_QUIETLY)
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message(STATUS "OpenCV ARCH: ${OpenCV_ARCH}")
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message(STATUS "OpenCV RUNTIME: ${OpenCV_RUNTIME}")
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message(STATUS "OpenCV STATIC: ${OpenCV_STATIC}")
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endif()
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get_filename_component(OpenCV_CONFIG_PATH "${CMAKE_CURRENT_LIST_FILE}" PATH CACHE)
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if(OpenCV_RUNTIME AND OpenCV_ARCH)
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if(OpenCV_STATIC AND EXISTS "${OpenCV_CONFIG_PATH}/${OpenCV_ARCH}/${OpenCV_RUNTIME}/staticlib/OpenCVConfig.cmake")
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if(OpenCV_CUDA AND EXISTS "${OpenCV_CONFIG_PATH}/gpu/${OpenCV_ARCH}/${OpenCV_RUNTIME}/staticlib/OpenCVConfig.cmake")
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set(OpenCV_LIB_PATH "${OpenCV_CONFIG_PATH}/gpu/${OpenCV_ARCH}/${OpenCV_RUNTIME}/staticlib")
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else()
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set(OpenCV_LIB_PATH "${OpenCV_CONFIG_PATH}/${OpenCV_ARCH}/${OpenCV_RUNTIME}/staticlib")
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endif()
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elseif(EXISTS "${OpenCV_CONFIG_PATH}/${OpenCV_ARCH}/${OpenCV_RUNTIME}/lib/OpenCVConfig.cmake")
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if(OpenCV_CUDA AND EXISTS "${OpenCV_CONFIG_PATH}/gpu/${OpenCV_ARCH}/${OpenCV_RUNTIME}/lib/OpenCVConfig.cmake")
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set(OpenCV_LIB_PATH "${OpenCV_CONFIG_PATH}/gpu/${OpenCV_ARCH}/${OpenCV_RUNTIME}/lib")
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else()
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set(OpenCV_LIB_PATH "${OpenCV_CONFIG_PATH}/${OpenCV_ARCH}/${OpenCV_RUNTIME}/lib")
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endif()
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endif()
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endif()
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if(OpenCV_LIB_PATH AND EXISTS "${OpenCV_LIB_PATH}/OpenCVConfig.cmake")
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set(OpenCV_LIB_DIR_OPT "${OpenCV_LIB_PATH}" CACHE PATH "Path where release OpenCV libraries are located" FORCE)
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set(OpenCV_LIB_DIR_DBG "${OpenCV_LIB_PATH}" CACHE PATH "Path where debug OpenCV libraries are located" FORCE)
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set(OpenCV_3RDPARTY_LIB_DIR_OPT "${OpenCV_LIB_PATH}" CACHE PATH "Path where release 3rdparty OpenCV dependencies are located" FORCE)
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set(OpenCV_3RDPARTY_LIB_DIR_DBG "${OpenCV_LIB_PATH}" CACHE PATH "Path where debug 3rdparty OpenCV dependencies are located" FORCE)
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include("${OpenCV_LIB_PATH}/OpenCVConfig.cmake")
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if(OpenCV_CUDA)
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set(_OpenCV_LIBS "")
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foreach(_lib ${OpenCV_LIBS})
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string(REPLACE "${OpenCV_CONFIG_PATH}/gpu/${OpenCV_ARCH}/${OpenCV_RUNTIME}" "${OpenCV_CONFIG_PATH}/${OpenCV_ARCH}/${OpenCV_RUNTIME}" _lib2 "${_lib}")
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if(NOT EXISTS "${_lib}" AND EXISTS "${_lib2}")
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list(APPEND _OpenCV_LIBS "${_lib2}")
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else()
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list(APPEND _OpenCV_LIBS "${_lib}")
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endif()
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endforeach()
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set(OpenCV_LIBS ${_OpenCV_LIBS})
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endif()
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set(OpenCV_FOUND TRUE CACHE BOOL "" FORCE)
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set(OPENCV_FOUND TRUE CACHE BOOL "" FORCE)
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if(NOT OpenCV_FIND_QUIETLY)
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message(STATUS "Found OpenCV ${OpenCV_VERSION} in ${OpenCV_LIB_PATH}")
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if(NOT OpenCV_LIB_PATH MATCHES "/staticlib")
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get_filename_component(_OpenCV_LIB_PATH "${OpenCV_LIB_PATH}/../bin" ABSOLUTE)
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file(TO_NATIVE_PATH "${_OpenCV_LIB_PATH}" _OpenCV_LIB_PATH)
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message(STATUS "You might need to add ${_OpenCV_LIB_PATH} to your PATH to be able to run your applications.")
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if(OpenCV_LIB_PATH MATCHES "/gpu/")
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string(REPLACE "\\gpu" "" _OpenCV_LIB_PATH2 "${_OpenCV_LIB_PATH}")
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message(STATUS "GPU support is enabled so you might also need ${_OpenCV_LIB_PATH2} in your PATH (it must go after the ${_OpenCV_LIB_PATH}).")
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endif()
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endif()
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endif()
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else()
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if(NOT OpenCV_FIND_QUIETLY)
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message(WARNING
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"Found OpenCV Windows Pack but it has no binaries compatible with your configuration.
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You should manually point CMake variable OpenCV_DIR to your build of OpenCV library."
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)
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endif()
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set(OpenCV_FOUND FALSE CACHE BOOL "" FORCE)
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set(OPENCV_FOUND FALSE CACHE BOOL "" FORCE)
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endif()
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#!/bin/bash
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#gcc -o opengl_example main.cpp -lGL -lGLU -lglut -lm
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rm -rf build
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mkdir -p build
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cd build
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cmake ..
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make -j4
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#include <opencv2/core.hpp>
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#include <opencv2/core/opengl.hpp>
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#include <opencv2/imgcodecs.hpp>
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#include <opencv2/imgproc/imgproc.hpp>
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#include <opencv2/highgui.hpp>
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#include <iostream>
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#include <GL/glew.h>
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#include <GL/glut.h>
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using namespace cv;
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using namespace std;
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Mat image;
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GLuint imageTexture;
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void displayMe(void)
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{
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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glTexImage2D( GL_TEXTURE_2D, // Type of texture
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0, // Pyramid level (for mip-mapping) - 0 is the top level
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GL_RGB, // Internal colour format to convert to
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image.cols, // Image width i.e. 640 for Kinect in standard mode
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image.rows, // Image height i.e. 480 for Kinect in standard mode
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0, // Border width in pixels (can either be 1 or 0)
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GL_RGB, // Input image format (i.e. GL_RGB, GL_RGBA, GL_BGR etc.)
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GL_UNSIGNED_BYTE, // Image data type
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image.ptr()); // The actual image data itself
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glEnd();
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glFlush();
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}
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int main(int argc, char** argv)
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{
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string image_path = samples::findFile("chart.png");
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Mat image = imread(image_path, IMREAD_COLOR);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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glGenTextures(1, &imageTexture);
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glBindTexture(GL_TEXTURE_2D, imageTexture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// Set texture clamping method
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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#if (CV_VERSION_MAJOR >= 4)
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cvtColor(image, image, cv::COLOR_BGR2RGB);
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#else
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cvtColor(image, image, CV_BGR2RGB);
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#endif
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//GLint dims[4] = {0};
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//glGetIntegerv(GL_VIEWPORT, dims);
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//GLint fbWidth = dims[2];
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//GLint fbHeight = dims[3];
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//cout << fbWidth << "," << fbHeight << endl;
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE);
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glutInitWindowSize(1920, 1080);
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glutInitWindowPosition(0, 0);
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glutCreateWindow("Hello world!");
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glutFullScreen();
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glutDisplayFunc(displayMe);
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glutMainLoop();
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return 0;
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}
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