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First Samplle for OpenCV with ImGui
cmake_minimum_required( VERSION 3.6 )
set( CMAKE_CXX_STANDARD 11 )
set( CMAKE_CXX_STANDARD_REQUIRED ON )
set( CMAKE_CXX_EXTENSIONS OFF )
find_package( Git )
execute_process(
COMMAND ${GIT_EXECUTABLE} clone "https://github.com/ocornut/imgui.git" -b v1.72b
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
)
set( IMGUI_DIR ${CMAKE_CURRENT_BINARY_DIR}/imgui )
set( imgui_files
${IMGUI_DIR}/imconfig.h
${IMGUI_DIR}/imgui.cpp
${IMGUI_DIR}/imgui.h
${IMGUI_DIR}/imgui_demo.cpp
${IMGUI_DIR}/imgui_draw.cpp
${IMGUI_DIR}/imgui_internal.h
${IMGUI_DIR}/imgui_widgets.cpp
${IMGUI_DIR}/imstb_rectpack.h
${IMGUI_DIR}/imstb_textedit.h
${IMGUI_DIR}/imstb_truetype.h
)
set( imgui_impl_files
${IMGUI_DIR}/examples/imgui_impl_glfw.h
${IMGUI_DIR}/examples/imgui_impl_glfw.cpp
${IMGUI_DIR}/examples/imgui_impl_opengl3.h
${IMGUI_DIR}/examples/imgui_impl_opengl3.cpp
)
set( gl3w
${IMGUI_DIR}/examples/libs/gl3w/GL/gl3w.c
)
project( sample )
add_executable( sample ${imgui_files} ${imgui_impl_files} ${gl3w} main.cpp )
set_property( DIRECTORY PROPERTY VS_STARTUP_PROJECT "sample" )
find_package( OpenCV REQUIRED )
find_package( OpenGL REQUIRED )
include( ExternalProject )
ExternalProject_Add(
glfw PREFIX glfw
GIT_REPOSITORY https://github.com/glfw/glfw.git
GIT_TAG 3.3
CMAKE_ARGS
"-DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>"
"-DCMAKE_BUILD_TYPE=Release"
"-DGLFW_BUILD_DOCS=OFF"
"-DGLFW_BUILD_EXAMPLES=OFF"
"-DGLFW_BUILD_TESTS=OFF"
)
ExternalProject_Get_Property( glfw INSTALL_DIR )
set( GLFW_DIR ${INSTALL_DIR} )
set( GLFW_INCLUDE_DIR ${GLFW_DIR}/include )
set( GLFW_LIBRARIES ${GLFW_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}glfw3${CMAKE_STATIC_LIBRARY_SUFFIX} )
add_dependencies( sample glfw )
if( OpenCV_FOUND AND OPENGL_FOUND )
include_directories( ${IMGUI_DIR} )
include_directories( ${IMGUI_DIR}/examples )
include_directories( ${IMGUI_DIR}/examples/libs/gl3w )
include_directories( ${OPENGL_INCLUDE_DIR} )
include_directories( ${GLFW_INCLUDE_DIR} )
target_link_libraries( sample ${OpenCV_LIBS} )
target_link_libraries( sample ${OPENGL_LIBRARIES} )
target_link_libraries( sample ${GLFW_LIBRARIES} )
endif()
#include <iostream>
#include <opencv2/opencv.hpp>
#include "imgui.h"
#include "imgui_impl_glfw.h"
#include "imgui_impl_opengl3.h"
#include <GL/gl3w.h>
#include <GLFW/glfw3.h>
int main( int argc, char* argv[] )
{
cv::Mat image = cv::imread( "../lena.jpg", cv::IMREAD_COLOR );
if( image.empty() ){
return -1;
}
cv::cvtColor( image, image, cv::COLOR_BGR2RGBA );
if( !glfwInit() ){
return -1;
}
GLFWwindow* window = glfwCreateWindow( 800, 600, "glfw window", nullptr, nullptr );
glfwSetWindowCloseCallback( window, []( GLFWwindow* window ){ glfwSetWindowShouldClose( window, GL_FALSE ); } );
glfwMakeContextCurrent( window );
glfwSwapInterval( 1 );
gl3wInit();
IMGUI_CHECKVERSION();
ImGui::CreateContext();
ImGui_ImplGlfw_InitForOpenGL( window, true );
ImGui_ImplOpenGL3_Init( "#version 330" );
bool is_show = true;
while( is_show ){
glfwPollEvents();
glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
glClear( GL_COLOR_BUFFER_BIT );
ImGui_ImplOpenGL3_NewFrame();
ImGui_ImplGlfw_NewFrame();
ImGui::NewFrame();
ImGui::Begin( "imgui image", &is_show );
GLuint texture;
glGenTextures( 1, &texture );
glBindTexture( GL_TEXTURE_2D, texture );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, image.cols, image.rows, 0, GL_RGBA, GL_UNSIGNED_BYTE, image.data );
ImGui::Image( reinterpret_cast<void*>( static_cast<intptr_t>( texture ) ), ImVec2( image.cols, image.rows ) );
ImGui::End();
ImGui::Render();
ImGui_ImplOpenGL3_RenderDrawData( ImGui::GetDrawData() );
glfwSwapBuffers( window );
}
ImGui_ImplGlfw_Shutdown();
ImGui_ImplOpenGL3_Shutdown();
ImGui::DestroyContext();
glfwTerminate();
return 0;
}
@UnaNancyOwen

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@UnaNancyOwen UnaNancyOwen commented Aug 31, 2019

2019-09-01_05h17_25

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