/*
 * Panel of BESM-6, displayed as a graphics window.
 * Using libSDL for graphics and libSDL_ttf for fonts.
 *
 * Copyright (c) 2009, Serge Vakulenko
 * Copyright (c) 2014, Leonid Broukhis
 *
 * 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
 * SERGE VAKULENKO OR LEONID BROUKHIS 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.

 * Except as contained in this notice, the name of Leonid Broukhis or
 * Serge Vakulenko shall not be used in advertising or otherwise to promote
 * the sale, use or other dealings in this Software without prior written
 * authorization from Leonid Broukhis and Serge Vakulenko.
 */
#ifdef HAVE_LIBSDL

#include "besm6_defs.h"
#include <stdlib.h>

/*
 * Use a 640x480 window with 32 bit pixels.
 */
#define WIDTH           800
#define HEIGHT          400
#define DEPTH           32

#define STEPX           14
#define STEPY           16

#include <SDL.h>
#include <SDL_ttf.h>

#define _QUOTE(x) #x
#define QUOTE(x) _QUOTE(x)

/* Data and functions that don't depend on SDL version */
static char *font_path;
static TTF_Font *font_big;
static TTF_Font *font_small;
static SDL_Color foreground;
static SDL_Color background;
static const SDL_Color white = { 255, 255, 255 };
static const SDL_Color black = { 0,   0,   0   };
static const SDL_Color cyan  = { 0,   128, 128 };
static const SDL_Color grey  = { 64,  64,  64  };
static t_value old_BRZ [8], old_GRP [2];
static t_value old_M [NREGS];

static const int regnum[] = {
    013, 012, 011, 010, 7, 6, 5, 4,
    027, 016, 015, 014, 3, 2, 1, 020,
};

static SDL_Surface *screen;

/*
 * Рисование текста в кодировке UTF-8, с антиалиасингом.
 * Параметр halign задаёт выравнивание по горизонтали.
 * Цвета заданы глобальными переменными foreground и background.
 */
static void render_utf8 (TTF_Font *font, int x, int y, int halign, char *message)
{
    SDL_Surface *text;
    SDL_Rect area;

    /* Build image from text */
    text = TTF_RenderUTF8_Shaded (font, message, foreground, background);

    area.x = x;
    if (halign < 0)
        area.x -= text->w;              /* align left */
    else if (halign == 0)
        area.x -= text->w / 2;          /* center */
    area.y = y;
    area.w = text->w;
    area.h = text->h;

    /* Put text image to screen */
    SDL_BlitSurface (text, 0, screen, &area);
    SDL_FreeSurface (text);
}

static SDL_Surface *sprite_from_data (int width, int height,
                                      const unsigned char *data)
{
    SDL_Surface *sprite, *optimized;
    unsigned *s, r, g, b, y, x;

    sprite = SDL_CreateRGBSurface (SDL_SWSURFACE,
                                   width, height, DEPTH, 0, 0, 0, 0);
    /*
      optimized = SDL_DisplayFormat (sprite);
      SDL_FreeSurface (sprite);
      sprite = optimized;
    */
    SDL_LockSurface (sprite);
    for (y=0; y<height; ++y) {
        s = (unsigned*) ((char*)sprite->pixels + y * sprite->pitch);
        for (x=0; x<width; ++x) {
            r = *data++;
            g = *data++;
            b = *data++;
            *s++ = SDL_MapRGB (sprite->format, r, g, b);
        }
    }
    SDL_UnlockSurface (sprite);
    return sprite;
}

/*
 * Рисуем неонку.
 */
static void draw_lamp (int left, int top, int on)
{
    /* Images created by GIMP: save as C file without alpha channel. */
    static const int lamp_width = 12;
    static const int lamp_height = 12;
    static const unsigned char lamp_on [12 * 12 * 3 + 1] =
        "\0\0\0\0\0\0\0\0\0\13\2\2-\14\14e\31\31e\31\31-\14\14\13\2\2\0\0\0\0\0\0"
        "\0\0\0\0\0\0\0\0\0D\20\20\313,,\377??\377CC\377CC\377DD\31333D\21\21\0\0"
        "\0\0\0\0\0\0\0D\20\20\357LL\377\243\243\376~~\37699\376@@\376@@\377AA\357"
        "<<D\21\21\0\0\0\13\2\2\313,,\377\243\243\377\373\373\377\356\356\377NN\377"
        ">>\377@@\377@@\377AA\31333\13\2\2-\14\14\377??\376~~\377\356\356\377\321"
        "\321\377<<\377??\377@@\377@@\376@@\377DD-\14\14e\31\31\377CC\37699\377NN"
        "\377<<\377??\377@@\377@@\377@@\376??\377CCe\31\31e\31\31\377CC\376@@\377"
        ">>\377??\377@@\377@@\377@@\377@@\376??\377CCe\31\31-\14\14\377DD\376@@\377"
        "@@\377@@\377@@\377@@\377@@\377@@\376@@\377DD-\14\14\13\2\2\31333\377AA\377"
        "@@\377@@\377@@\377@@\377@@\377@@\377AA\31333\13\2\2\0\0\0D\21\21\357<<\377"
        "AA\376@@\376??\376??\376@@\377AA\357<<D\21\21\0\0\0\0\0\0\0\0\0D\21\21\313"
        "33\377DD\377CC\377CC\377DD\31333D\21\21\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\13"
        "\2\2-\14\14e\31\31e\31\31-\14\14\13\2\2\0\0\0\0\0\0\0\0\0";
    static const unsigned char lamp_off [12 * 12 * 3 + 1] =
        "\0\0\0\0\0\0\0\0\0\0\0\0\14\2\2\14\2\2\14\2\2\14\2\2\0\0\0\0\0\0\0\0\0\0"
        "\0\0\0\0\0\0\0\0\25\5\5A\21\21h\32\32c\30\30c\30\30h\32\32A\21\21\25\5\5"
        "\0\0\0\0\0\0\0\0\0\25\5\5\\\30\30""8\16\16\0\0\0\0\0\0\0\0\0\0\0\0""8\16"
        "\16\\\30\30\25\5\5\0\0\0\0\0\0A\21\21""8\16\16\0\0\0\0\0\0\0\0\0\0\0\0\0"
        "\0\0\0\0\0""8\16\16A\21\21\0\0\0\14\2\2h\32\32\0\0\0\0\0\0\0\0\0\0\0\0\0"
        "\0\0\0\0\0\0\0\0\0\0\0h\32\32\14\2\2\14\2\2c\30\30\0\0\0\0\0\0\0\0\0\0\0"
        "\0\0\0\0\0\0\0\0\0\0\0\0\0c\30\30\14\2\2\14\2\2c\30\30\0\0\0\0\0\0\0\0\0"
        "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0c\30\30\14\2\2\14\2\2h\32\32\0\0\0\0\0\0\0"
        "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0h\32\32\14\2\2\0\0\0A\21\21""8\16\16\0"
        "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0""8\16\16A\21\21\0\0\0\0\0\0\25\5\5\\\30"
        "\30""8\16\16\0\0\0\0\0\0\0\0\0\0\0\0""8\16\16\\\30\30\25\5\5\0\0\0\0\0\0"
        "\0\0\0\25\5\5A\21\21h\32\32c\30\30c\30\30h\32\32A\21\21\25\5\5\0\0\0\0\0"
        "\0\0\0\0\0\0\0\0\0\0\0\0\0\14\2\2\14\2\2\14\2\2\14\2\2\0\0\0\0\0\0\0\0\0"
        "\0\0\0";
    static SDL_Surface *sprite_on, *sprite_off;
    SDL_Rect area;

    if (! sprite_on) {
        sprite_on = sprite_from_data (lamp_width, lamp_height,
                                      lamp_on);
    }
    if (! sprite_off) {
        sprite_off = sprite_from_data (lamp_width, lamp_height,
                                       lamp_off);
    }
    area.x = left;
    area.y = top;
    area.w = lamp_width;
    area.h = lamp_height;
    SDL_BlitSurface (on ? sprite_on : sprite_off, 0, screen, &area);
}

/*
 * Отрисовка лампочек БРЗ.
 */
static void draw_modifiers_periodic (int group, int left, int top)
{
    int x, y, reg, val;

    for (y=0; y<8; ++y) {
        reg = regnum [y + group*8];
        val = M [reg];
        if (val == old_M [reg])
            continue;
        old_M [reg] = val;
        for (x=0; x<15; ++x) {
            draw_lamp (left+76 + x*STEPX, top+28 + y*STEPY, val >> (14-x) & 1);
        }
    }
}

/*
 * Отрисовка лампочек ГРП и МГРП.
 */
static void draw_grp_periodic (int top)
{
    int x, y;
    t_value val;

    for (y=0; y<2; ++y) {
        val = y ? MGRP : GRP;
        if (val == old_GRP [y])
            continue;
        old_GRP [y] = val;
        for (x=0; x<48; ++x) {
            draw_lamp (100 + x*STEPX, top+28 + y*STEPY, val >> (47-x) & 1);
        }
    }
}

/*
 * Отрисовка лампочек БРЗ.
 */
static void draw_brz_periodic (int top)
{
    int x, y;
    t_value val;

    for (y=0; y<8; ++y) {
        val = BRZ [7-y];
        if (val == old_BRZ [7-y])
            continue;
        old_BRZ [7-y] = val;
        for (x=0; x<48; ++x) {
            draw_lamp (100 + x*STEPX, top+28 + y*STEPY, val >> (47-x) & 1);
        }
    }
}

/*
 * Отрисовка статичной части регистров-модификаторов.
 */
static void draw_modifiers_static (int group, int left, int top)
{
    int x, y, color, reg;
    char message [40];
    SDL_Rect area;

    background = black;
    foreground = cyan;

    /* Оттеняем группы разрядов. */
    color = grey.r << 16 | grey.g << 8 | grey.b;
    for (x=3; x<15; x+=3) {
        area.x = left + 74 + x*STEPX;
        area.y = top + 26;
        area.w = 2;
        area.h = 8*STEPY + 2;
        SDL_FillRect (screen, &area, color);
    }
    /* Названия регистров. */
    for (y=0; y<8; ++y) {
        reg = regnum [y + group*8];
        sprintf (message, "М%2o", reg);
        render_utf8 (font_big, left, top + 24 + y*STEPY, 1, message);
        old_M [reg] = ~0;
    }
    /* Номера битов. */
    for (x=0; x<15; ++x) {
        sprintf (message, "%d", 15-x);
        render_utf8 (font_small, left+82 + x*STEPX,
                     (x & 1) ? top+4 : top+10, 0, message);
    }
}

/*
 * Отрисовка статичной части регистров ГРП и МГРП.
 */
static void draw_grp_static (int top)
{
    int x, y, color;
    char message [40];
    SDL_Rect area;

    background = black;
    foreground = cyan;

    /* Оттеняем группы разрядов. */
    color = grey.r << 16 | grey.g << 8 | grey.b;
    for (x=3; x<48; x+=3) {
        area.x = 98 + x*STEPX;
        area.y = top + 26;
        area.w = 2;
        area.h = 2*STEPY + 2;
        SDL_FillRect (screen, &area, color);
    }
    /* Названия регистров. */
    for (y=0; y<2; ++y) {
        render_utf8 (font_big, 24, top + 24 + y*STEPY, 1, y ? "МГРП" : "ГРП");
        old_GRP[y] = ~0;
    }
    /* Номера битов. */
    for (x=0; x<48; ++x) {
        sprintf (message, "%d", 48-x);
        render_utf8 (font_small, 106 + x*STEPX,
                     (x & 1) ? top+10 : top+4, 0, message);
    }
}

/*
 * Отрисовка статичной части регистров БРЗ.
 */
static void draw_brz_static (int top)
{
    int x, y, color;
    char message [40];
    SDL_Rect area;

    background = black;
    foreground = cyan;

    /* Оттеняем группы разрядов. */
    color = grey.r << 16 | grey.g << 8 | grey.b;
    for (x=3; x<48; x+=3) {
        area.x = 98 + x*STEPX;
        area.y = top + 26;
        area.w = 2;
        area.h = 8*STEPY + 2;
        SDL_FillRect (screen, &area, color);
    }
    /* Названия регистров. */
    for (y=7; y>=0; --y) {
        sprintf (message, "БРЗ %d", 7-y);
        render_utf8 (font_big, 24, top + 24 + y*STEPY, 1, message);
        old_BRZ[y] = ~0;
    }
}

/*
 * Закрываем графическое окно.
 */
void besm6_close_panel ()
{
    if (! screen)
        return;
    TTF_Quit();
    SDL_Quit();
    screen = 0;
}

#if SDL_MAJOR_VERSION == 2

static SDL_Window *sdlWindow;
static SDL_Renderer *sdlRenderer;
static SDL_Texture *sdlTexture;


/*
 * Начальная инициализация графического окна и шрифтов.
 */
static void init_panel ()
{
    if (sim_switches & SWMASK('Q'))
        return;

    /* Initialize SDL subsystems - in this case, only video. */
    if (SDL_Init (SDL_INIT_VIDEO) < 0) {
        fprintf (stderr, "SDL: unable to init: %s\n",
                 SDL_GetError ());
        exit (1);
    }
    sdlWindow = SDL_CreateWindow ("BESM-6 panel",
                                  SDL_WINDOWPOS_UNDEFINED,
                                  SDL_WINDOWPOS_UNDEFINED,
                                  WIDTH, HEIGHT, 0 /* regular window */);
    if (! sdlWindow) {
        fprintf (stderr, "SDL: unable to set %dx%dx%d mode: %s\n",
                 WIDTH, HEIGHT, DEPTH, SDL_GetError ());
        exit (1);
    }

    sdlRenderer = SDL_CreateRenderer(sdlWindow, -1, 0);
    /* Make black background */
    SDL_SetRenderDrawColor(sdlRenderer, 0, 0, 0, 255);
    SDL_RenderClear(sdlRenderer);

    /* Initialize the TTF library */
    if (TTF_Init() < 0) {
        fprintf (stderr, "SDL: couldn't initialize TTF: %s\n",
                 SDL_GetError());
        SDL_Quit();
        exit (1);
    }

    /* Open the font file with the requested point size */
    font_big = TTF_OpenFont (QUOTE(FONTFILE), 16);
    font_small = TTF_OpenFont (QUOTE(FONTFILE), 9);
    if (! font_big || ! font_small) {
        fprintf(stderr, "SDL: couldn't load font %s: %s\n",
                QUOTE(FONTFILE), SDL_GetError());
        besm6_close_panel();
        exit (1);
    }
    atexit (besm6_close_panel);

    screen = SDL_CreateRGBSurface(0, WIDTH, HEIGHT, 32,
                                  0x00FF0000,
                                  0x0000FF00,
                                  0x000000FF,
                                  0xFF000000);

    sdlTexture = SDL_CreateTexture(sdlRenderer,
                                   SDL_PIXELFORMAT_ARGB8888,
                                   SDL_TEXTUREACCESS_STATIC,
                                   WIDTH, HEIGHT);

    /* Отрисовка статичной части панели БЭСМ-6. */
    draw_modifiers_static (0, 24, 10);
    draw_modifiers_static (1, 400, 10);
    draw_grp_static (180);
    draw_brz_static (230);

    /* Tell SDL to update the whole screen */
    SDL_UpdateTexture(sdlTexture, NULL, screen->pixels, screen->pitch);
    SDL_RenderClear(sdlRenderer);
    SDL_RenderCopy(sdlRenderer, sdlTexture, NULL, NULL);
    SDL_RenderPresent (sdlRenderer);
}

void (*sim_vm_init)() = init_panel;

/*
 * Обновляем графическое окно.
 */
void besm6_draw_panel ()
{
    if (! screen)
        return;

    /* Периодическая отрисовка: мигание лампочек. */
    draw_modifiers_periodic (0, 24, 10);
    draw_modifiers_periodic (1, 400, 10);
    draw_grp_periodic (180);
    draw_brz_periodic (230);

    /* Tell SDL to update the whole screen */
    SDL_UpdateTexture(sdlTexture, NULL, screen->pixels, screen->pitch);
    SDL_RenderClear(sdlRenderer);
    SDL_RenderCopy(sdlRenderer, sdlTexture, NULL, NULL);
    SDL_RenderPresent (sdlRenderer);

    /* Exit SIMH when window closed.*/
    SDL_Event event;
    if (SDL_PollEvent (&event) && event.type == SDL_QUIT)
        longjmp (cpu_halt, SCPE_STOP);
}

#else

/*
 * Начальная инициализация графического окна и шрифтов.
 */
static void init_panel ()
{
    if (sim_switches & SWMASK('Q'))
        return;

    /* Initialize SDL subsystems - in this case, only video. */
    if (SDL_Init (SDL_INIT_VIDEO) < 0) {
        fprintf (stderr, "SDL: unable to init: %s\n",
                 SDL_GetError ());
        exit (1);
    }
    screen = SDL_SetVideoMode (WIDTH, HEIGHT, DEPTH, SDL_SWSURFACE);
    if (! screen) {
        fprintf (stderr, "SDL: unable to set %dx%dx%d mode: %s\n",
                 WIDTH, HEIGHT, DEPTH, SDL_GetError ());
        exit (1);
    }

    /* Initialize the TTF library */
    if (TTF_Init() < 0) {
        fprintf (stderr, "SDL: couldn't initialize TTF: %s\n",
                 SDL_GetError());
        SDL_Quit();
        exit (1);
    }

    /* Find font file */
    if (ftw (FONTPATH1, probe_font, 255) <= 0 &&
        ftw (FONTPATH2, probe_font, 255) <= 0 &&
        ftw (FONTPATH3, probe_font, 255) <= 0) {
        fprintf(stderr, "SDL: couldn't find font %s in directory %s\n",
                FONTNAME, FONTPATH1);
        besm6_close_panel();
        exit (1);
    }

    /* Open the font file with the requested point size */
    font_big = TTF_OpenFont (font_path, 16);
    font_small = TTF_OpenFont (font_path, 9);
    if (! font_big || ! font_small) {
        fprintf(stderr, "SDL: couldn't load font %s: %s\n",
                FONTNAME, TTF_GetError());
        besm6_close_panel();
        exit (1);
    }
    atexit (besm6_close_panel);

    /* Отрисовка статичной части панели БЭСМ-6. */
    draw_modifiers_static (0, 24, 10);
    draw_modifiers_static (1, 400, 10);
    draw_grp_static (180);
    draw_brz_static (230);

    /* Tell SDL to update the whole screen */
    SDL_UpdateRect (screen, 0, 0, WIDTH, HEIGHT);
}

void (*sim_vm_init)() = init_panel;

/*
 * Обновляем графическое окно.
 */
void besm6_draw_panel ()
{
    if (! screen)
        return;

    /* Периодическая отрисовка: мигание лампочек. */
    draw_modifiers_periodic (0, 24, 10);
    draw_modifiers_periodic (1, 400, 10);
    draw_grp_periodic (180);
    draw_brz_periodic (230);

    /* Tell SDL to update the whole screen */
    SDL_UpdateRect (screen, 0, 0, WIDTH, HEIGHT);

    /* Exit SIMH when window closed.*/
    SDL_Event event;
    if (SDL_PollEvent (&event) && event.type == SDL_QUIT)
        longjmp (cpu_halt, SCPE_STOP);
}

#endif /* SDL_MAJOR_VERSION */

#else /* HAVE_LIBSDL */
void besm6_draw_panel ()
{
}
#endif /* HAVE_LIBSDL */