src/video/mir/SDL_miropengl.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

/*
  Contributed by Brandon Schaefer, <brandon.schaefer@canonical.com>
*/

#include "../../SDL_internal.h"

#if SDL_VIDEO_DRIVER_MIR

#include "SDL_miropengl.h"

#include <dlfcn.h>

#define DEFAULT_OGL_ES2 "libGLESv2.so"

#include "SDL_mirdyn.h"

void* MIR_GLHandle = NULL;

void
MIR_GL_SwapWindow(_THIS, SDL_Window* window)
{
    MIR_Window* mir_wind = window->driverdata;

    SDL_EGL_SwapBuffers(_this, mir_wind->egl_surface);
}

int
MIR_GL_MakeCurrent(_THIS, SDL_Window* window, SDL_GLContext context)
{
  if (window) {
      EGLSurface egl_surface = ((MIR_Window*)window->driverdata)->egl_surface;
      return SDL_EGL_MakeCurrent(_this, egl_surface, context);
  }

  return SDL_EGL_MakeCurrent(_this, NULL, NULL);
}

SDL_GLContext
MIR_GL_CreateContext(_THIS, SDL_Window* window)
{
    MIR_Window* mir_window = window->driverdata;

    SDL_GLContext context;
    context = SDL_EGL_CreateContext(_this, mir_window->egl_surface);

    return context;
}

int
MIR_GL_LoadLibrary(_THIS, const char* path)
{
    MIR_Data* mir_data = _this->driverdata;

    SDL_EGL_LoadLibrary(_this, path, MIR_mir_connection_get_egl_native_display(mir_data->connection));

    SDL_EGL_ChooseConfig(_this);

    return 0;
}

void
MIR_GL_UnloadLibrary(_THIS)
{
    SDL_EGL_UnloadLibrary(_this);

    if (MIR_GLHandle) {
        dlclose(MIR_GLHandle);
        MIR_GLHandle = NULL;
    }
}

void
Ensure_GL_HandleOpen()
{
    if (!MIR_GLHandle) {
        MIR_GLHandle = dlopen(DEFAULT_OGL_ES2, RTLD_GLOBAL);
        if (!MIR_GLHandle) {
            SDL_SetError("Failed to dlopen library.");
        }
    }
}

void*
MIR_GL_GetProcAddress(_THIS, const char* proc)
{
    void* proc_addr = SDL_EGL_GetProcAddress(_this, proc);

    /* FIXME when on the phone/tablet eglGetProcAddress returns NULL through libhybris,
       seems to be a problem in android. Also looks like a problem in the android video driver:
       src/video/android/SDL_androidgl.c

       Workaround, to just get the address ourself
    */

    if (!proc_addr) {
        Ensure_GL_HandleOpen();
        proc_addr = dlsym(MIR_GLHandle, proc);
    }

    if (!proc_addr) {
        SDL_SetError("Failed to find proc address!");
    }

    return proc_addr;
}

#endif /* SDL_VIDEO_DRIVER_MIR */

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