OpenGL

Headless OpenGL

See OpenGL Visualization without x server.
The high-level summary is to:

1. Link EGL with -lEGL along with -lGL.
2. Replace your window and context creation with EGL calls.

Expand

Code snippet

Code copied from OpenGL Visualization without x server

#include <EGL/egl.h>

static const EGLint configAttribs[] = {
  EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
  EGL_BLUE_SIZE, 8,
  EGL_GREEN_SIZE, 8,
  EGL_RED_SIZE, 8,
  EGL_DEPTH_SIZE, 8,
  EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
  EGL_NONE
};  <br />

static const int pbufferWidth = 9;
static const int pbufferHeight = 9;

static const EGLint pbufferAttribs[] = {
  EGL_WIDTH, pbufferWidth,
  EGL_HEIGHT, pbufferHeight,
  EGL_NONE,
};

int main(int argc, char *argv[])
{
  // 1. Initialize EGL
  EGLDisplay eglDpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);

  EGLint major, minor;

  eglInitialize(eglDpy, &major, &minor);

  // 2. Select an appropriate configuration
  EGLint numConfigs;
  EGLConfig eglCfg;

  eglChooseConfig(eglDpy, configAttribs, &eglCfg, 1, &numConfigs);

  // 3. Create a surface
  EGLSurface eglSurf = eglCreatePbufferSurface(eglDpy, eglCfg, 
                                               pbufferAttribs);

  // 4. Bind the API
  eglBindAPI(EGL_OPENGL_API);

  // 5. Create a context and make it current
  EGLContext eglCtx = eglCreateContext(eglDpy, eglCfg, EGL_NO_CONTEXT, 
                                       NULL);

  eglMakeCurrent(eglDpy, eglSurf, eglSurf, eglCtx);

  // from now on use your OpenGL context

  // 6. Terminate EGL when finished
  eglTerminate(eglDpy);
  return 0;
}