egl_offscreen_opengl

Example program for creating an OpenGL context with EGL for offscreen rendering with a framebuffer.

Based on https://www.khronos.org/registry/egl/sdk/docs/man/html/eglIntro.xhtml.

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For those want to use CMake

cmake_minimum_required(VERSION 3.10)
#set(CMAKE_CXX_STANDARD 14)
project (egl)
set(CMAKE_BUILD_TYPE Debug)
set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-unused-parameter")
set(CMAKE_CXX_FLAGS_DEBUG "-g")
set(CMAKE_CXX_FLAGS_RELEASE "-O3")

# Include OpenCV header files
find_package(OpenCV REQUIRED)
find_package(OpenGL REQUIRED COMPONENTS OpenGL EGL) 


link_directories(${OPENGL_LIBRARIES_DIRS} ${OPENGL_LIBRARIES_DIRS})
include_directories(${CMAKE_SOURCE_DIR} ${OPENGL_INCLUDE_DIRS} ${OpenCV_INCLUDE_DIRS})

add_executable(egl egl.cpp)
# add_executable(egl read_obj.cc)
target_link_libraries(egl 
  PRIVATE ${OpenCV_LIBRARIES}
  PRIVATE OpenGL::OpenGL OpenGL::EGL
)

set(CMAKE_INSTALL_PREFIX ${CMAKE_SOURCE_DIR})
install(
	TARGETS egl 
    DESTINATION ${CMAKE_INSTALL_PREFIX}
)

Docker support

Hi, is it possible to add support for docker?

Excellent work!

This repo is what i want!

I'm new to OpenGL. I wrote a program using freeglut api to draw a triangle and save the screen as a .png file with certain view.

At first, it works on my own PC. But when I try to run it on an Amazon EC2 instance, it failed to create a opengl context.

After search on google, egl is the solution, but it's really hard to find a runnable code. Then I found this repo! Thanks for sharing such a runnable and commented demo to us!