/*
 * QEMU SDL display driver -- opengl support
 *
 * Copyright (c) 2014 Red Hat
 *
 * Authors:
 *     Gerd Hoffmann <kraxel@redhat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu-common.h"
#include "ui/console.h"
#include "ui/input.h"
#include "ui/sdl2.h"
#include "sysemu/sysemu.h"

static void sdl2_gl_render_surface(struct sdl2_console *scon)
{
    int ww, wh;

    SDL_GL_MakeCurrent(scon->real_window, scon->winctx);

    SDL_GetWindowSize(scon->real_window, &ww, &wh);
    surface_gl_setup_viewport(scon->gls, scon->surface, ww, wh);

    surface_gl_render_texture(scon->gls, scon->surface);
    SDL_GL_SwapWindow(scon->real_window);
}

void sdl2_gl_update(DisplayChangeListener *dcl,
                    int x, int y, int w, int h)
{
    struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);

    assert(scon->opengl);

    SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
    surface_gl_update_texture(scon->gls, scon->surface, x, y, w, h);
    scon->updates++;
}

void sdl2_gl_switch(DisplayChangeListener *dcl,
                    DisplaySurface *new_surface)
{
    struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);
    DisplaySurface *old_surface = scon->surface;

    assert(scon->opengl);

    SDL_GL_MakeCurrent(scon->real_window, scon->winctx);
    surface_gl_destroy_texture(scon->gls, scon->surface);

    scon->surface = new_surface;

    if (!new_surface) {
        console_gl_fini_context(scon->gls);
        scon->gls = NULL;
        sdl2_window_destroy(scon);
        return;
    }

    if (!scon->real_window) {
        sdl2_window_create(scon);
        scon->gls = console_gl_init_context();
    } else if (old_surface &&
               ((surface_width(old_surface)  != surface_width(new_surface)) ||
                (surface_height(old_surface) != surface_height(new_surface)))) {
        sdl2_window_resize(scon);
    }

    surface_gl_create_texture(scon->gls, scon->surface);
}

void sdl2_gl_refresh(DisplayChangeListener *dcl)
{
    struct sdl2_console *scon = container_of(dcl, struct sdl2_console, dcl);

    assert(scon->opengl);

    graphic_hw_update(dcl->con);
    if (scon->updates && scon->surface) {
        scon->updates = 0;
        sdl2_gl_render_surface(scon);
    }
    sdl2_poll_events(scon);
}

void sdl2_gl_redraw(struct sdl2_console *scon)
{
    assert(scon->opengl);

    if (scon->surface) {
        sdl2_gl_render_surface(scon);
    }
}