/* Helper to set up GL state as we want it. */
static void setup_gl(ALLEGRO_DISPLAY *d)
{
ALLEGRO_OGL_EXTRAS *ogl = d->ogl_extras;
if (ogl->backbuffer)
_al_ogl_resize_backbuffer(ogl->backbuffer, d->w, d->h);
else
ogl->backbuffer = _al_ogl_create_backbuffer(d);
_al_iphone_setup_opengl_view(d);
}
static void setup_fbo_backbuffer(ALLEGRO_DISPLAY *display,
ALLEGRO_BITMAP *bitmap)
{
display->ogl_extras->opengl_target = bitmap;
// The IS_OPENGLES part is a hack.
if (IS_OPENGLES ||
display->ogl_extras->extension_list->ALLEGRO_GL_EXT_framebuffer_object ||
display->ogl_extras->extension_list->ALLEGRO_GL_OES_framebuffer_object)
{
_al_ogl_bind_framebuffer(0);
}
#ifdef ALLEGRO_IPHONE
_al_iphone_setup_opengl_view(display, false);
#endif
}
static void setup_fbo(ALLEGRO_DISPLAY *display, ALLEGRO_BITMAP *bitmap)
{
ALLEGRO_BITMAP_OGL *ogl_bitmap;
if (bitmap->parent)
bitmap = bitmap->parent;
ogl_bitmap = (void *)bitmap;
/* We can't return here. Target's FBO can be taken away by locking
* a lot of bitmaps consecutively.
* Also affects ex_multiwin; resizing one window affects the other.
*/
if (false && display->ogl_extras->opengl_target == ogl_bitmap)
return;
#if !defined ALLEGRO_GP2XWIZ
if (!ogl_bitmap->is_backbuffer) {
ALLEGRO_FBO_INFO *info = NULL;
/* When a bitmap is set as target bitmap, we try to create an FBO for it.
*/
if (ogl_bitmap->fbo_info == NULL && !(bitmap->flags & ALLEGRO_FORCE_LOCKING)) {
#ifdef ALLEGRO_IPHONE
/* FIXME This is quite a hack but I don't know how the Allegro extension
* manager works to fix this properly (getting extensions properly reported
* on iphone.
*/
if (true)
#else
if (al_get_opengl_extension_list()->ALLEGRO_GL_EXT_framebuffer_object ||
al_get_opengl_extension_list()->ALLEGRO_GL_OES_framebuffer_object)
#endif
{
info = ogl_find_unused_fbo(display);
ASSERT(info->fbo_state != FBO_INFO_PERSISTENT);
if (info->fbo_state == FBO_INFO_TRANSIENT) {
info->owner->fbo_info = NULL;
ALLEGRO_DEBUG("Deleting FBO: %u\n", info->fbo);
glDeleteFramebuffersEXT(1, &info->fbo);
_al_ogl_reset_fbo_info(info);
}
glGenFramebuffersEXT(1, &info->fbo);
ALLEGRO_DEBUG("Created FBO: %u\n", info->fbo);
}
}
else {
info = ogl_bitmap->fbo_info;
}
if (info && info->fbo) {
/* Bind to the FBO. */
#ifndef ALLEGRO_IPHONE
ASSERT(display->ogl_extras->extension_list->ALLEGRO_GL_EXT_framebuffer_object ||
display->ogl_extras->extension_list->ALLEGRO_GL_OES_framebuffer_object);
#endif
if (info->fbo_state == FBO_INFO_UNUSED)
info->fbo_state = FBO_INFO_TRANSIENT;
info->owner = ogl_bitmap;
info->last_use_time = al_get_time();
ogl_bitmap->fbo_info = info;
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, info->fbo);
/* Attach the texture. */
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D, ogl_bitmap->texture, 0);
if (glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) !=
GL_FRAMEBUFFER_COMPLETE_EXT) {
/* For some reason, we cannot use the FBO with this
* texture. So no reason to keep re-trying, output a log
* message and switch to (extremely slow) software mode.
*/
ALLEGRO_ERROR("Could not use FBO for bitmap with format %s.\n",
_al_pixel_format_name(bitmap->format));
ALLEGRO_ERROR("*** SWITCHING TO SOFTWARE MODE ***\n");
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glDeleteFramebuffersEXT(1, &info->fbo);
_al_ogl_reset_fbo_info(info);
ogl_bitmap->fbo_info = NULL;
}
else {
display->ogl_extras->opengl_target = ogl_bitmap;
glViewport(0, 0, bitmap->w, bitmap->h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, bitmap->w, bitmap->h, 0, -1, 1);
}
}
}
else {
display->ogl_extras->opengl_target = ogl_bitmap;
// TODO: Might as well have a vtable entry here
#ifdef ALLEGRO_IPHONE
_al_iphone_setup_opengl_view(display);
#else
if (display->ogl_extras->extension_list->ALLEGRO_GL_EXT_framebuffer_object ||
display->ogl_extras->extension_list->ALLEGRO_GL_OES_framebuffer_object) {
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}
glViewport(0, 0, display->w, display->h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
/* We use upside down coordinates compared to OpenGL, so the bottommost
* coordinate is display->h not 0.
*/
glOrtho(0, display->w, display->h, 0, -1, 1);
#endif
}
#else
ALLEGRO_DISPLAY_GP2XWIZ_OGL *wiz_disp = (ALLEGRO_DISPLAY_GP2XWIZ_OGL *)display;
display->ogl_extras->opengl_target = ogl_bitmap;
if (!ogl_bitmap->is_backbuffer) {
/* FIXME: implement */
}
else {
eglMakeCurrent(wiz_disp->egl_display, wiz_disp->egl_surface, wiz_disp->egl_surface, wiz_disp->egl_context);
glViewport(0, 0, display->w, display->h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
/* We use upside down coordinates compared to OpenGL, so the bottommost
* coordinate is display->h not 0.
*/
glOrtho(0, display->w, display->h, 0, -1, 1);
}
#endif
}
