/*

    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 <stdio.h>

#include <stdlib.h>

#include <nds.h>

#include "SDL_config.h"

#include "SDL_video.h"

#include "../SDL_sysvideo.h"

#include "../SDL_yuv_sw_c.h"

#include "../SDL_renderer_sw.h"

/* SDL surface based renderer implementation */

static SDL_Renderer *SDL_NDS_CreateRenderer(SDL_Window * window,

                                            Uint32 flags);

static int SDL_NDS_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g,

                              Uint8 b, Uint8 a, const SDL_Rect * rect);

static int SDL_NDS_RenderCopy(SDL_Renderer * renderer,

                              SDL_Texture * texture,

                              const SDL_Rect * srcrect,

                              const SDL_Rect * dstrect);

static void SDL_NDS_RenderPresent(SDL_Renderer * renderer);

static void SDL_NDS_DestroyRenderer(SDL_Renderer * renderer);

SDL_RenderDriver SDL_NDS_RenderDriver = {

    SDL_NDS_CreateRenderer,

    {"nds", SDL_RENDERER_PRESENTCOPY}

/*   (SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTCOPY |

      SDL_RENDERER_PRESENTFLIP2 | SDL_RENDERER_PRESENTFLIP3 |

      SDL_RENDERER_PRESENTDISCARD),*/

};

typedef struct

{

    int current_screen;

    SDL_Surface *screens[3];

    int ultimate_answer;

} SDL_NDS_RenderData;

/* this is mainly hackish testing/debugging stuff to get cleaned up soon

   anything named sdlds_blah shouldn't make it into the stable version

 */

u16

sdlds_rgb2bgr(u16 c)

{

/* hack to get the proper colors until I actually get BGR555 to work right */

    u16 Rmask = 0x7C00, Bmask = 0x001F, GAmask = 0x83E0, r, b;

    r = (c & Rmask) >> 10;

    b = (c & Bmask) << 10;

    return (c & GAmask) | r | b;

}

void

sdlds_surf2vram(SDL_Surface * s)

{

    if (s->w == 256) {

        dmaCopy((u8 *) (s->pixels) + 156 * sizeof(u16),

                VRAM_A, 256 * 192 * sizeof(u16));

    }

}

void

sdlds_print_pixfmt_info(SDL_PixelFormat * f)

{

    if (!f)

        return;

    printf("bpp: %d\nRGBA: %x %x %x %x\n",

           f->BitsPerPixel, f->Rmask, f->Gmask, f->Bmask, f->Amask);

}

void

sdlds_print_surface_info(SDL_Surface * s)

{

    if (!s)

        return;

    printf("flags: %x\nsize: %dx%d, pitch: %d\nlocked: %d, refcount: %d\n",

           s->flags, s->w, s->h, s->pitch, s->locked, s->refcount);

    sdlds_print_pixfmt_info(s->format);

}

SDL_Renderer *

SDL_NDS_CreateRenderer(SDL_Window * window, Uint32 flags)

{

    SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

    SDL_DisplayMode *displayMode = &display->current_mode;

    SDL_Renderer *renderer;

    SDL_NDS_RenderData *data;

    int i, n;

    int bpp = 15;

    Uint32 Rmask, Gmask, Bmask, Amask;

/*  Uint32 Rmask = 0x7C00, Gmask = 0x03E0, Bmask = 0x001F, Amask = 0x8000;

    Uint32 Rmask = 0x001F, Gmask = 0x03E0, Bmask = 0x7C00, Amask = 0x8000;

*/

#if 0

    printf("SDL_NDS_CreateRenderer(window, 0x%x)\n", flags);

    printf(" window: (%d,%d), %dx%d\n",

           window->x, window->y, window->w, window->h);

#endif

    /* hard coded this to BGR555 for now */

    if (!SDL_PixelFormatEnumToMasks(SDL_PIXELFORMAT_BGR555, &bpp,

                                    &Rmask, &Gmask, &Bmask, &Amask)) {

        SDL_SetError("Unknown display format");

        return NULL;

    }

    renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));

    if (!renderer) {

        SDL_OutOfMemory();

        return NULL;

    }

    data = (SDL_NDS_RenderData *) SDL_malloc(sizeof(*data));

    if (!data) {

        SDL_NDS_DestroyRenderer(renderer);

        SDL_OutOfMemory();

        return NULL;

    }

    SDL_zerop(data);

    renderer->RenderFill = SDL_NDS_RenderFill;

    renderer->RenderCopy = SDL_NDS_RenderCopy;

    renderer->RenderPresent = SDL_NDS_RenderPresent;

    renderer->DestroyRenderer = SDL_NDS_DestroyRenderer;

    renderer->info.name = SDL_NDS_RenderDriver.info.name;

    renderer->info.flags = 0;

    renderer->window = window->id;

    renderer->driverdata = data;

    Setup_SoftwareRenderer(renderer);

    if (flags & SDL_RENDERER_PRESENTFLIP2) {

        renderer->info.flags |= SDL_RENDERER_PRESENTFLIP2;

        n = 2;

    } else if (flags & SDL_RENDERER_PRESENTFLIP3) {

        renderer->info.flags |= SDL_RENDERER_PRESENTFLIP3;

        n = 3;

    } else {

        renderer->info.flags |= SDL_RENDERER_PRESENTCOPY;

        n = 1;

    }

    for (i = 0; i < n; ++i) {

        data->screens[i] =

            SDL_CreateRGBSurface(0, 256, 192, bpp, Rmask, Gmask, Bmask,

                                 Amask);

        if (!data->screens[i]) {

            SDL_NDS_DestroyRenderer(renderer);

            return NULL;

        }

        SDL_SetSurfacePalette(data->screens[i], display->palette);

        sdlds_print_surface_info(data->screens[i]);

    }

    data->current_screen = 0;

    data->ultimate_answer = 42;

    return renderer;

}

static int

SDL_NDS_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g, Uint8 b,

                   Uint8 a, const SDL_Rect * rect)

{

    SDL_NDS_RenderData *data = (SDL_NDS_RenderData *) renderer->driverdata;

    SDL_Surface *target = data->screens[data->current_screen];

    Uint32 color;

    SDL_Rect real_rect = *rect;

    color = SDL_MapRGBA(target->format, r, g, b, a);

    return SDL_FillRect(target, &real_rect, color);

}

static int

SDL_NDS_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,

                   const SDL_Rect * srcrect, const SDL_Rect * dstrect)

{

    SDL_NDS_RenderData *data = (SDL_NDS_RenderData *) renderer->driverdata;

    SDL_Window *window = SDL_GetWindowFromID(renderer->window);

    SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

#if 0

    printf("SDL_NDS_RenderCopy(renderer, texture, srcrect, dstrect)\n");

    printf(" renderer: %s\n", renderer->info.name);

    printf(" texture: %dx%d\n", texture->w, texture->h);

    printf(" srcrect: (%d,%d), %dx%d\n", srcrect->x, srcrect->y, srcrect->w,

           srcrect->h);

    printf(" dstrect: (%d,%d), %dx%d\n", dstrect->x, dstrect->y, dstrect->w,

           dstrect->h);

#endif

    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {

        SDL_Surface *target = data->screens[data->current_screen];

        void *pixels =

            (Uint8 *) target->pixels + dstrect->y * target->pitch +

            dstrect->x * target->format->BytesPerPixel;

        return SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,

                                   srcrect, display->current_mode.format,

                                   dstrect->w, dstrect->h, pixels,

                                   target->pitch);

    } else {

        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        SDL_Surface *target = data->screens[data->current_screen];

        SDL_Rect real_srcrect = *srcrect;

        SDL_Rect real_dstrect = *dstrect;

        /*sdlds_print_surface_info(surface);

           sdlds_print_surface_info(target); */

        sdlds_surf2vram(surface);

        return SDL_LowerBlit(surface, &real_srcrect, target, &real_dstrect);

    }

#if 0

    /* copy it directly to vram */

    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

    int sx = srcrect->x, sy = srcrect->y, sw = srcrect->w, sh = srcrect->h;

    int dx = dstrect->x, dy = dstrect->y, dw = dstrect->w, dh = dstrect->h;

    int si, sj, di, dj;

    for (sj = 0, dj = 0; sj < sh && dj < dh; ++sj, ++dj) {

        for (si = 0, di = 0; si < sw && di < dw; ++si, ++di) {

            VRAM_A[(dj + dy) * 256 + di + dx] =

                ((Uint16 *) surface->pixels)[(sj + sy) * (surface->w) + si +

                                             sx];

        }

    }

    return 0;

#endif

}

static void

SDL_NDS_RenderPresent(SDL_Renderer * renderer)

{

    SDL_NDS_RenderData *data = (SDL_NDS_RenderData *) renderer->driverdata;

    int i;

#if 0

    printf("SDL_NDS_RenderPresent(renderer)\n");

    printf(" renderer: %s\n", renderer->info.name);

#endif

    /* Send the data to the display */

    /* hack to fix the pixel format until I figure out why BGR doesn't work */

    for (i = 0; i < 256 * 192; ++i) {

        VRAM_A[i] = sdlds_rgb2bgr(VRAM_A[i]);

    }

    /* Update the flipping chain, if any */

    if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP2) {

        data->current_screen = (data->current_screen + 1) % 2;

    } else if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP3) {

        data->current_screen = (data->current_screen + 1) % 3;

    }

}

static void

SDL_NDS_DestroyRenderer(SDL_Renderer * renderer)

{

    SDL_NDS_RenderData *data = (SDL_NDS_RenderData *) renderer->driverdata;

    int i;

    printf("SDL_NDS_DestroyRenderer(renderer)\n");

    printf(" renderer: %s\n", renderer->info.name);

    if (data) {

        for (i = 0; i < SDL_arraysize(data->screens); ++i) {

            if (data->screens[i]) {

                SDL_FreeSurface(data->screens[i]);

            }

        }

        SDL_free(data);

    }

    SDL_free(renderer);

}

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