/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    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 St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/* Dummy SDL video driver implementation; this is just enough to make an

 *  SDL-based application THINK it's got a working video driver, for

 *  applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,

 *  and also for use as a collection of stubs when porting SDL to a new

 *  platform for which you haven't yet written a valid video driver.

 *

 * This is also a great way to determine bottlenecks: if you think that SDL

 *  is a performance problem for a given platform, enable this driver, and

 *  then see if your application runs faster without video overhead.

 *

 * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion

 *  of this was cut-and-pasted from Stephane Peter's work in the AAlib

 *  SDL video driver.  Renamed to "DUMMY" by Sam Lantinga.

 */

#include <stdio.h>

#include <stdlib.h>

#include <nds.h>

#include "SDL_video.h"

#include "SDL_mouse.h"

#include "../SDL_sysvideo.h"

#include "../SDL_pixels_c.h"

#include "../../events/SDL_events_c.h"

#include "SDL_ndsvideo.h"

#include "SDL_ndsevents_c.h"

#include "SDL_ndsrender_c.h"

#define NDSVID_DRIVER_NAME "nds"

/* Initialization/Query functions */

static int NDS_VideoInit(_THIS);

static int NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode);

static void NDS_VideoQuit(_THIS);

/* DUMMY driver bootstrap functions */

static int

NDS_Available(void)

{

    const char *envr = SDL_getenv("SDL_VIDEODRIVER");

    /*printf("NDS_Available()\n"); */

    return (1);

}

static void

NDS_DeleteDevice(SDL_VideoDevice * device)

{

    SDL_free(device);

}

static SDL_VideoDevice *

NDS_CreateDevice(int devindex)

{

    SDL_VideoDevice *device;

    /*printf("NDS_CreateDevice(%d)\n", devindex); */

    /* Initialize all variables that we clean on shutdown */

    device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));

    if (!device) {

        SDL_OutOfMemory();

        if (device) {

            SDL_free(device);

        }

        return (0);

    }

    /* Set the function pointers */

    device->VideoInit = NDS_VideoInit;

    device->VideoQuit = NDS_VideoQuit;

    device->SetDisplayMode = NDS_SetDisplayMode;

    device->PumpEvents = NDS_PumpEvents;

    device->num_displays = 2;   /* DS = dual screens */

    device->free = NDS_DeleteDevice;

    return device;

}

VideoBootStrap NDS_bootstrap = {

    NDSVID_DRIVER_NAME, "SDL NDS video driver",

    NDS_Available, NDS_CreateDevice

};

int

NDS_VideoInit(_THIS)

{

    SDL_DisplayMode mode;

    int i;

    /* simple 256x192x15x60 for now */

    mode.w = 256;

    mode.h = 192;

    mode.format = SDL_PIXELFORMAT_BGR555;

    mode.refresh_rate = 60;

    mode.driverdata = NULL;

    SDL_AddBasicVideoDisplay(&mode);

    SDL_AddRenderDriver(0, &SDL_NDS_RenderDriver);

    SDL_zero(mode);

    SDL_AddDisplayMode(0, &mode);

    /* hackish stuff to get things up and running for now, and for a console */

    powerON(POWER_ALL);

    videoSetMode(MODE_FB0);

    videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE);    /* debug text on sub */

    vramSetBankA(VRAM_A_LCD);

    vramSetBankC(VRAM_C_SUB_BG);

    irqInit();

    irqEnable(IRQ_VBLANK);

    /* set up console for debug text 'n stuff */

    SUB_BG0_CR = BG_MAP_BASE(31);

    BG_PALETTE_SUB[255] = RGB15(31, 31, 31);

    consoleInitDefault((u16 *) SCREEN_BASE_BLOCK_SUB(31),

                       (u16 *) CHAR_BASE_BLOCK_SUB(0), 16);

    /*NDS_SetDisplayMode(_this, &mode); */

    return 0;

}

static int

NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode)

{

    /* right now this function is just hard-coded for 256x192 ABGR1555 */

#if 0

    videoSetMode(MODE_5_2D | DISPLAY_BG3_ACTIVE);       /* display on main core */

    videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE);    /* debug text on sub */

    vramSetMainBanks(VRAM_A_MAIN_BG_0x06000000, VRAM_B_LCD,

                     VRAM_C_SUB_BG, VRAM_D_LCD);

    /* maps well to the 256x192 screen anyway.  note: need VRAM_B for bigger */

    BG3_CR = BG_BMP16_256x256;

    /* affine transformation matrix.  nothing too fancy here */

    BG3_XDX = 0x100;

    BG3_XDY = 0;

    BG3_YDX = 0;

    BG3_YDY = 0x100;

    /* x/y position */

    BG3_CX = 0;

    BG3_CY = 0;

#endif

    return 0;

}

void

NDS_VideoQuit(_THIS)

{

}

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