/*
 *  test-textures.c - Test GstVaapiTexture
 *
 *  Copyright (C) 2010-2011 Splitted-Desktop Systems
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2.1
 *  of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301 USA
 */

#include "gst/vaapi/sysdeps.h"
#include <gst/vaapi/gstvaapidisplay_glx.h>
#include <gst/vaapi/gstvaapiwindow_glx.h>
#include <gst/vaapi/gstvaapisurface.h>
#include <gst/vaapi/gstvaapiimage.h>
#include <gst/vaapi/gstvaapitexture.h>
#include "image.h"

static inline void pause(void)
{
    g_print("Press any key to continue...\n");
    getchar();
}

static inline guint gl_get_current_texture_2d(void)
{
    GLint texture;
    glGetIntegerv(GL_TEXTURE_BINDING_2D, &texture);
    return (guint)texture;
}

int
main(int argc, char *argv[])
{
    GstVaapiDisplay    *display;
    GstVaapiWindow     *window;
    GstVaapiWindowGLX  *glx_window;
    GstVaapiSurface    *surface;
    GstVaapiImage      *image;
    GstVaapiTexture    *textures[2];
    GstVaapiTexture    *texture;
    GLuint              texture_id;
    GstVaapiRectangle   src_rect;
    GstVaapiRectangle   dst_rect;
    guint               flags = GST_VAAPI_PICTURE_STRUCTURE_FRAME;

    static const GstVaapiChromaType chroma_type = GST_VAAPI_CHROMA_TYPE_YUV420;
    static const guint              width       = 320;
    static const guint              height      = 240;
    static const guint              win_width   = 640;
    static const guint              win_height  = 480;

    gst_init(&argc, &argv);

    display = gst_vaapi_display_glx_new(NULL);
    if (!display)
        g_error("could not create VA display");

    surface = gst_vaapi_surface_new(display, chroma_type, width, height);
    if (!surface)
        g_error("could not create VA surface");

    image = image_generate(display, GST_VIDEO_FORMAT_NV12, width, height);
    if (!image)
        g_error("could not create VA image");
    if (!image_upload(image, surface))
        g_error("could not upload VA image to surface");

    window = gst_vaapi_window_glx_new(display, win_width, win_height);
    if (!window)
        g_error("could not create window");
    glx_window = GST_VAAPI_WINDOW_GLX(window);

    gst_vaapi_window_show(window);

    if (!gst_vaapi_window_glx_make_current(glx_window))
        g_error("coult not bind GL context");

    g_print("#\n");
    g_print("# Create texture with gst_vaapi_texture_new()\n");
    g_print("#\n");
    {
        texture = gst_vaapi_texture_new(
            display,
            GL_TEXTURE_2D,
            GL_RGBA,
            width,
            height
        );
        if (!texture)
            g_error("could not create VA texture");

        textures[0] = texture;
        texture_id  = gst_vaapi_texture_get_id(texture);

        if (!gst_vaapi_texture_put_surface(texture, surface, flags))
            g_error("could not transfer VA surface to texture");

        if (!gst_vaapi_window_glx_put_texture(glx_window, texture, NULL, NULL))
            g_error("could not render texture into the window");
    }

    g_print("#\n");
    g_print("# Create texture with gst_vaapi_texture_new_with_texture()\n");
    g_print("#\n");
    {
        const GLenum target = GL_TEXTURE_2D;
        const GLenum format = GL_BGRA;

        glEnable(target);
        glGenTextures(1, &texture_id);
        glBindTexture(target, texture_id);
        glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
        glTexImage2D(
            target,
            0,
            GL_RGBA8,
            width, height,
            0,
            format,
            GL_UNSIGNED_BYTE,
            NULL
        );
        glDisable(target);

        texture = gst_vaapi_texture_new_with_texture(
            display,
            texture_id,
            target,
            format
        );
        if (!texture)
            g_error("could not create VA texture");

        if (texture_id != gst_vaapi_texture_get_id(texture))
            g_error("invalid texture id");

        if (gl_get_current_texture_2d() != texture_id)
            g_error("gst_vaapi_texture_new_with_texture() altered texture bindings");

        textures[1] = texture;

        if (!gst_vaapi_texture_put_surface(texture, surface, flags))
            g_error("could not transfer VA surface to texture");

        if (gl_get_current_texture_2d() != texture_id)
            g_error("gst_vaapi_texture_put_surface() altered texture bindings");

        src_rect.x      = 0;
        src_rect.y      = 0;
        src_rect.width  = width;
        src_rect.height = height;

        dst_rect.x      = win_width/2;
        dst_rect.y      = win_height/2;
        dst_rect.width  = win_width/2;
        dst_rect.height = win_height/2;

        if (!gst_vaapi_window_glx_put_texture(glx_window, texture, 
                                              &src_rect, &dst_rect))
            g_error("could not render texture into the window");

        if (gl_get_current_texture_2d() != texture_id)
            g_error("gst_vaapi_window_glx_put_texture() altered texture bindings");
    }

    gst_vaapi_window_glx_swap_buffers(glx_window);
    pause();

    gst_vaapi_texture_unref(textures[0]);
    gst_vaapi_texture_unref(textures[1]);
    glDeleteTextures(1, &texture_id);

    gst_vaapi_window_unref(window);
    gst_vaapi_display_unref(display);
    gst_deinit();
    return 0;
}