/*
  Copyright (C) 1997-2016 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.
*/
/********************************************************************************
 *                                                                              *
 * Test of the overlay used for moved pictures, test more closed to real life.  *
 * Running trojan moose :) Coded by Mike Gorchak.                               *
 *                                                                              *
 ********************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif

#include "SDL.h"

#define MOOSEPIC_W 64
#define MOOSEPIC_H 88

#define MOOSEFRAME_SIZE (MOOSEPIC_W * MOOSEPIC_H)
#define MOOSEFRAMES_COUNT 10

SDL_Color MooseColors[84] = {
    {49, 49, 49}
    , {66, 24, 0}
    , {66, 33, 0}
    , {66, 66, 66}
    ,
    {66, 115, 49}
    , {74, 33, 0}
    , {74, 41, 16}
    , {82, 33, 8}
    ,
    {82, 41, 8}
    , {82, 49, 16}
    , {82, 82, 82}
    , {90, 41, 8}
    ,
    {90, 41, 16}
    , {90, 57, 24}
    , {99, 49, 16}
    , {99, 66, 24}
    ,
    {99, 66, 33}
    , {99, 74, 33}
    , {107, 57, 24}
    , {107, 82, 41}
    ,
    {115, 57, 33}
    , {115, 66, 33}
    , {115, 66, 41}
    , {115, 74, 0}
    ,
    {115, 90, 49}
    , {115, 115, 115}
    , {123, 82, 0}
    , {123, 99, 57}
    ,
    {132, 66, 41}
    , {132, 74, 41}
    , {132, 90, 8}
    , {132, 99, 33}
    ,
    {132, 99, 66}
    , {132, 107, 66}
    , {140, 74, 49}
    , {140, 99, 16}
    ,
    {140, 107, 74}
    , {140, 115, 74}
    , {148, 107, 24}
    , {148, 115, 82}
    ,
    {148, 123, 74}
    , {148, 123, 90}
    , {156, 115, 33}
    , {156, 115, 90}
    ,
    {156, 123, 82}
    , {156, 132, 82}
    , {156, 132, 99}
    , {156, 156, 156}
    ,
    {165, 123, 49}
    , {165, 123, 90}
    , {165, 132, 82}
    , {165, 132, 90}
    ,
    {165, 132, 99}
    , {165, 140, 90}
    , {173, 132, 57}
    , {173, 132, 99}
    ,
    {173, 140, 107}
    , {173, 140, 115}
    , {173, 148, 99}
    , {173, 173, 173}
    ,
    {181, 140, 74}
    , {181, 148, 115}
    , {181, 148, 123}
    , {181, 156, 107}
    ,
    {189, 148, 123}
    , {189, 156, 82}
    , {189, 156, 123}
    , {189, 156, 132}
    ,
    {189, 189, 189}
    , {198, 156, 123}
    , {198, 165, 132}
    , {206, 165, 99}
    ,
    {206, 165, 132}
    , {206, 173, 140}
    , {206, 206, 206}
    , {214, 173, 115}
    ,
    {214, 173, 140}
    , {222, 181, 148}
    , {222, 189, 132}
    , {222, 189, 156}
    ,
    {222, 222, 222}
    , {231, 198, 165}
    , {231, 231, 231}
    , {239, 206, 173}
};

Uint8 MooseFrame[MOOSEFRAMES_COUNT][MOOSEFRAME_SIZE*2];
SDL_Texture *MooseTexture;
SDL_Rect displayrect;
int window_w;
int window_h;
SDL_Window *window;
SDL_Renderer *renderer;
int paused = 0;
int i;
SDL_bool done = SDL_FALSE;
Uint32 pixel_format = SDL_PIXELFORMAT_YV12;
int fpsdelay;

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
    SDL_Quit();
    exit(rc);
}

/* All RGB2YUV conversion code and some other parts of code has been taken from testoverlay.c */

/* NOTE: These RGB conversion functions are not intended for speed,
         only as examples.
*/

void
RGBtoYUV(Uint8 * rgb, int *yuv, int monochrome, int luminance)
{
    if (monochrome) {
#if 1                           /* these are the two formulas that I found on the FourCC site... */
        yuv[0] = (int)(0.299 * rgb[0] + 0.587 * rgb[1] + 0.114 * rgb[2]);
        yuv[1] = 128;
        yuv[2] = 128;
#else
        yuv[0] = (int)(0.257 * rgb[0]) + (0.504 * rgb[1]) + (0.098 * rgb[2]) + 16;
        yuv[1] = 128;
        yuv[2] = 128;
#endif
    } else {
#if 1                           /* these are the two formulas that I found on the FourCC site... */
        yuv[0] = (int)(0.299 * rgb[0] + 0.587 * rgb[1] + 0.114 * rgb[2]);
        yuv[1] = (int)((rgb[2] - yuv[0]) * 0.565 + 128);
        yuv[2] = (int)((rgb[0] - yuv[0]) * 0.713 + 128);
#else
        yuv[0] = (0.257 * rgb[0]) + (0.504 * rgb[1]) + (0.098 * rgb[2]) + 16;
        yuv[1] = 128 - (0.148 * rgb[0]) - (0.291 * rgb[1]) + (0.439 * rgb[2]);
        yuv[2] = 128 + (0.439 * rgb[0]) - (0.368 * rgb[1]) - (0.071 * rgb[2]);
#endif
    }

    if (luminance != 100) {
        yuv[0] = yuv[0] * luminance / 100;
        if (yuv[0] > 255)
            yuv[0] = 255;
    }
}

void
ConvertRGBtoYV12(Uint8 *rgb, Uint8 *out, int w, int h,
                 int monochrome, int luminance)
{
    int x, y;
    int yuv[3];
    Uint8 *op[3];

    op[0] = out;
    op[1] = op[0] + w*h;
    op[2] = op[1] + w*h/4;
    for (y = 0; y < h; ++y) {
        for (x = 0; x < w; ++x) {
            RGBtoYUV(rgb, yuv, monochrome, luminance);
            *(op[0]++) = yuv[0];
            if (x % 2 == 0 && y % 2 == 0) {
                *(op[1]++) = yuv[2];
                *(op[2]++) = yuv[1];
            }
            rgb += 3;
        }
    }
}

void
ConvertRGBtoNV12(Uint8 *rgb, Uint8 *out, int w, int h,
                 int monochrome, int luminance)
{
    int x, y;
    int yuv[3];
    Uint8 *op[2];

    op[0] = out;
    op[1] = op[0] + w*h;
    for (y = 0; y < h; ++y) {
        for (x = 0; x < w; ++x) {
            RGBtoYUV(rgb, yuv, monochrome, luminance);
            *(op[0]++) = yuv[0];
            if (x % 2 == 0 && y % 2 == 0) {
                *(op[1]++) = yuv[1];
                *(op[1]++) = yuv[2];
            }
            rgb += 3;
        }
    }
}

static void
PrintUsage(char *argv0)
{
    SDL_Log("Usage: %s [arg] [arg] [arg] ...\n", argv0);
    SDL_Log("\n");
    SDL_Log("Where 'arg' is any of the following options:\n");
    SDL_Log("\n");
    SDL_Log("    -fps <frames per second>\n");
    SDL_Log("    -nodelay\n");
    SDL_Log("    -format <fmt> (one of the: YV12, IYUV, YUY2, UYVY, YVYU)\n");
    SDL_Log("    -scale <scale factor> (initial scale of the overlay)\n");
    SDL_Log("    -help (shows this help)\n");
    SDL_Log("\n");
    SDL_Log("Press ESC to exit, or SPACE to freeze the movie while application running.\n");
    SDL_Log("\n");
}

void
loop()
{
    SDL_Event event;

    while (SDL_PollEvent(&event)) {
        switch (event.type) {
        case SDL_WINDOWEVENT:
            if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
                SDL_RenderSetViewport(renderer, NULL);
                displayrect.w = window_w = event.window.data1;
                displayrect.h = window_h = event.window.data2;
            }
            break;
        case SDL_MOUSEBUTTONDOWN:
            displayrect.x = event.button.x - window_w / 2;
            displayrect.y = event.button.y - window_h / 2;
            break;
        case SDL_MOUSEMOTION:
            if (event.motion.state) {
                displayrect.x = event.motion.x - window_w / 2;
                displayrect.y = event.motion.y - window_h / 2;
            }
            break;
        case SDL_KEYDOWN:
            if (event.key.keysym.sym == SDLK_SPACE) {
                paused = !paused;
                break;
            }
            if (event.key.keysym.sym != SDLK_ESCAPE) {
                break;
            }
        case SDL_QUIT:
            done = SDL_TRUE;
            break;
        }
    }

#ifndef __EMSCRIPTEN__
    SDL_Delay(fpsdelay);
#endif

    if (!paused) {
        i = (i + 1) % MOOSEFRAMES_COUNT;

        SDL_UpdateTexture(MooseTexture, NULL, MooseFrame[i], MOOSEPIC_W*SDL_BYTESPERPIXEL(pixel_format));
    }
    SDL_RenderClear(renderer);
    SDL_RenderCopy(renderer, MooseTexture, NULL, &displayrect);
    SDL_RenderPresent(renderer);

#ifdef __EMSCRIPTEN__
    if (done) {
        emscripten_cancel_main_loop();
    }
#endif
}

int
main(int argc, char **argv)
{
    Uint8 *RawMooseData;
    SDL_RWops *handle;
    SDL_Window *window;
    int j;
    int fps = 12;
    int fpsdelay;
    int nodelay = 0;
#ifdef TEST_NV12
    Uint32 pixel_format = SDL_PIXELFORMAT_NV12;
#else
    Uint32 pixel_format = SDL_PIXELFORMAT_YV12;
#endif
    int scale = 5;

    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return 3;
    }

    while (argc > 1) {
        if (strcmp(argv[1], "-fps") == 0) {
            if (argv[2]) {
                fps = atoi(argv[2]);
                if (fps == 0) {
                    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                            "The -fps option requires an argument [from 1 to 1000], default is 12.\n");
                    quit(10);
                }
                if ((fps < 0) || (fps > 1000)) {
                    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                            "The -fps option must be in range from 1 to 1000, default is 12.\n");
                    quit(10);
                }
                argv += 2;
                argc -= 2;
            } else {
                SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                        "The -fps option requires an argument [from 1 to 1000], default is 12.\n");
                quit(10);
            }
        } else if (strcmp(argv[1], "-nodelay") == 0) {
            nodelay = 1;
            argv += 1;
            argc -= 1;
        } else if (strcmp(argv[1], "-scale") == 0) {
            if (argv[2]) {
                scale = atoi(argv[2]);
                if (scale == 0) {
                    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                            "The -scale option requires an argument [from 1 to 50], default is 5.\n");
                    quit(10);
                }
                if ((scale < 0) || (scale > 50)) {
                    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                            "The -scale option must be in range from 1 to 50, default is 5.\n");
                    quit(10);
                }
                argv += 2;
                argc -= 2;
            } else {
                SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                        "The -fps option requires an argument [from 1 to 1000], default is 12.\n");
                quit(10);
            }
        } else if ((strcmp(argv[1], "-help") == 0)
                   || (strcmp(argv[1], "-h") == 0)) {
            PrintUsage(argv[0]);
            quit(0);
        } else {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unrecognized option: %s.\n", argv[1]);
            quit(10);
        }
        break;
    }

    RawMooseData = (Uint8 *) malloc(MOOSEFRAME_SIZE * MOOSEFRAMES_COUNT);
    if (RawMooseData == NULL) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Can't allocate memory for movie !\n");
        free(RawMooseData);
        quit(1);
    }

    /* load the trojan moose images */
    handle = SDL_RWFromFile("moose.dat", "rb");
    if (handle == NULL) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Can't find the file moose.dat !\n");
        free(RawMooseData);
        quit(2);
    }

    SDL_RWread(handle, RawMooseData, MOOSEFRAME_SIZE, MOOSEFRAMES_COUNT);

    SDL_RWclose(handle);

    /* Create the window and renderer */
    window_w = MOOSEPIC_W * scale;
    window_h = MOOSEPIC_H * scale;
    window = SDL_CreateWindow("Happy Moose",
                              SDL_WINDOWPOS_UNDEFINED,
                              SDL_WINDOWPOS_UNDEFINED,
                              window_w, window_h,
                              SDL_WINDOW_RESIZABLE);
    if (!window) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't set create window: %s\n", SDL_GetError());
        free(RawMooseData);
        quit(4);
    }

    renderer = SDL_CreateRenderer(window, -1, 0);
    if (!renderer) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't set create renderer: %s\n", SDL_GetError());
        free(RawMooseData);
        quit(4);
    }

    MooseTexture = SDL_CreateTexture(renderer, pixel_format, SDL_TEXTUREACCESS_STREAMING, MOOSEPIC_W, MOOSEPIC_H);
    if (!MooseTexture) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't set create texture: %s\n", SDL_GetError());
        free(RawMooseData);
        quit(5);
    }
    /* Uncomment this to check vertex color with a YUV texture */
    /* SDL_SetTextureColorMod(MooseTexture, 0xff, 0x80, 0x80); */

    for (i = 0; i < MOOSEFRAMES_COUNT; i++) {
        Uint8 MooseFrameRGB[MOOSEFRAME_SIZE*3];
        Uint8 *rgb;
        Uint8 *frame;

        rgb = MooseFrameRGB;
        frame = RawMooseData + i * MOOSEFRAME_SIZE;
        for (j = 0; j < MOOSEFRAME_SIZE; ++j) {
            rgb[0] = MooseColors[frame[j]].r;
            rgb[1] = MooseColors[frame[j]].g;
            rgb[2] = MooseColors[frame[j]].b;
            rgb += 3;
        }
        switch (pixel_format) {
        case SDL_PIXELFORMAT_YV12:
            ConvertRGBtoYV12(MooseFrameRGB, MooseFrame[i], MOOSEPIC_W, MOOSEPIC_H, 0, 100);
            break;
        case SDL_PIXELFORMAT_NV12:
            ConvertRGBtoNV12(MooseFrameRGB, MooseFrame[i], MOOSEPIC_W, MOOSEPIC_H, 0, 100);
            break;
        default:
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unsupported pixel format\n");
            break;
        }
    }

    free(RawMooseData);

    /* set the start frame */
    i = 0;
    if (nodelay) {
        fpsdelay = 0;
    } else {
        fpsdelay = 1000 / fps;
    }

    displayrect.x = 0;
    displayrect.y = 0;
    displayrect.w = window_w;
    displayrect.h = window_h;

    /* Ignore key up events, they don't even get filtered */
    SDL_EventState(SDL_KEYUP, SDL_IGNORE);

    /* Loop, waiting for QUIT or RESIZE */
#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, nodelay ? 0 : fps, 1);
#else
    while (!done) {
        loop();
            }
#endif

    SDL_DestroyRenderer(renderer);
    quit(0);
    return 0;
}

/* vi: set ts=4 sw=4 expandtab: */