C++ (Cpp) gst_gl_display_egl_new Examples

Example #1

File: gub_graphics.c Project: ua-i2cat/gst-unity-bridge

static GUBGraphicContext *gub_create_graphic_context_egl(GstPipeline *pipeline, float crop_left, float crop_top, float crop_right, float crop_bottom)
{
    static const GLfloat vVertices[] = {
        -1.f, -1.f,   0.f, 0.f,
        -1.f,  1.f,   0.f, 1.f,
         1.f, -1.f,   1.f, 0.f,
         1.f,  1.f,   1.f, 1.f
    };
    guintptr raw_context;
    GstStructure *s;
    GstGLDisplay *display;
    GstGLContext *gl_context;
    GUBGraphicContextEGL *gcontext;

    raw_context = gst_gl_context_get_current_gl_context(GST_GL_PLATFORM_EGL);
    if (!raw_context) {
        gub_log("Could not retrieve current EGL context");
        return NULL;
    }

    display = (GstGLDisplay *)gst_gl_display_egl_new();
    gl_context = gst_gl_context_new_wrapped(display, raw_context, GST_GL_PLATFORM_EGL, GST_GL_API_GLES2);
    gub_log("Current GL context is %p (GSTGL Platform %s GSTGL API %s)", raw_context,
        gst_gl_platform_to_string(gst_gl_context_get_gl_platform(gl_context)),
        gst_gl_api_to_string(gst_gl_context_get_gl_api(gl_context)));
    gub_log("VENDOR: %s", glGetString(GL_VENDOR));
    gub_log("RENDERER: %s", glGetString(GL_RENDERER));
    gub_log("VERSION: %s", glGetString(GL_VERSION));
    gub_log("GLSL VERSION: %s", glGetString(GL_SHADING_LANGUAGE_VERSION));

    gcontext = (GUBGraphicContextEGL *)malloc(sizeof(GUBGraphicContextEGL));
    gcontext->gl = gl_context;
    gcontext->display = display;
    gcontext->crop_left = crop_left;
    gcontext->crop_top = crop_top;
    gcontext->crop_right = crop_right;
    gcontext->crop_bottom = crop_bottom;

    glGenFramebuffers(1, &gcontext->fbo);

    if (gl_context->gl_vtable->GenVertexArrays)
        gl_context->gl_vtable->GenVertexArrays(1, &gcontext->vao);
    if (gcontext->gl->gl_vtable->BindVertexArray)
        gcontext->gl->gl_vtable->BindVertexArray(gcontext->vao);

    glGenBuffers(1, &gcontext->vbo);
    glBindBuffer(GL_ARRAY_BUFFER, gcontext->vbo);
    glBufferData(GL_ARRAY_BUFFER, 16 * sizeof(GLfloat), vVertices, GL_STATIC_DRAW);
    glBindBuffer(GL_ARRAY_BUFFER, 0);

    gcontext->po = gub_create_program();

    gcontext->samplerLoc = glGetUniformLocation(gcontext->po, "sTexture");

    return gcontext;
}

Example #2

File: gstgldisplay.c Project: asrashley/gst-plugins-bad

/**
 * gst_gl_display_new:
 *
 * Returns: (transfer full): a new #GstGLDisplay
 *
 * Since: 1.4
 */
GstGLDisplay *
gst_gl_display_new (void)
{
  GstGLDisplay *display = NULL;
  const gchar *user_choice, *platform_choice;
  static volatile gsize _init = 0;

  if (g_once_init_enter (&_init)) {
    GST_DEBUG_CATEGORY_INIT (gst_gl_display_debug, "gldisplay", 0,
        "gldisplay element");
    g_once_init_leave (&_init, 1);
  }

  user_choice = g_getenv ("GST_GL_WINDOW");
  platform_choice = g_getenv ("GST_GL_PLATFORM");
  GST_INFO ("creating a display, user choice:%s (platform: %s)",
      GST_STR_NULL (user_choice), GST_STR_NULL (platform_choice));

#if GST_GL_HAVE_WINDOW_COCOA
  if (!display && (!user_choice || g_strstr_len (user_choice, 5, "cocoa"))) {
    display = GST_GL_DISPLAY (gst_gl_display_cocoa_new ());
    if (!display)
      return NULL;
  }
#endif
#if GST_GL_HAVE_WINDOW_X11
  if (!display && (!user_choice || g_strstr_len (user_choice, 3, "x11")))
    display = GST_GL_DISPLAY (gst_gl_display_x11_new (NULL));
#endif
#if GST_GL_HAVE_WINDOW_WAYLAND
  if (!display && (!user_choice || g_strstr_len (user_choice, 7, "wayland")))
    display = GST_GL_DISPLAY (gst_gl_display_wayland_new (NULL));
#endif
#if GST_GL_HAVE_PLATFORM_EGL
  if (!display && (!platform_choice
          || g_strstr_len (platform_choice, 3, "egl")))
    display = GST_GL_DISPLAY (gst_gl_display_egl_new ());
#endif
  if (!display) {
    /* subclass returned a NULL window */
    GST_WARNING ("Could not create display. user specified %s "
        "(platform: %s), creating dummy",
        GST_STR_NULL (user_choice), GST_STR_NULL (platform_choice));

    return g_object_new (GST_TYPE_GL_DISPLAY, NULL);
  }

  return display;
}