/*

SDL - Simple DirectMedia Layer

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 <nds/arm9/video.h>

//#include <nds/arm9/sprite.h>

//#include <nds/arm9/trig_lut.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 NDS renderer implementation */

static SDL_Renderer *NDS_CreateRenderer(SDL_Window * window, Uint32 flags);

static int NDS_ActivateRenderer(SDL_Renderer * renderer);

static int NDS_DisplayModeChanged(SDL_Renderer * renderer);

static int NDS_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static int NDS_QueryTexturePixels(SDL_Renderer * renderer,

SDL_Texture * texture, void **pixels,

int *pitch);

static int NDS_SetTexturePalette(SDL_Renderer * renderer,

SDL_Texture * texture,

const SDL_Color * colors, int firstcolor,

int ncolors);

static int NDS_GetTexturePalette(SDL_Renderer * renderer,

SDL_Texture * texture, SDL_Color * colors,

int firstcolor, int ncolors);

static int NDS_SetTextureColorMod(SDL_Renderer * renderer,

SDL_Texture * texture);

static int NDS_SetTextureAlphaMod(SDL_Renderer * renderer,

SDL_Texture * texture);

static int NDS_SetTextureBlendMode(SDL_Renderer * renderer,

SDL_Texture * texture);

static int NDS_SetTextureScaleMode(SDL_Renderer * renderer,

SDL_Texture * texture);

static int NDS_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, const void *pixels,

int pitch);

static int NDS_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, int markDirty,

void **pixels, int *pitch);

static void NDS_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);

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

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

static int NDS_RenderCopy(SDL_Renderer * renderer,

SDL_Texture * texture,

const SDL_Rect * srcrect, const SDL_Rect * dstrect);

static void NDS_RenderPresent(SDL_Renderer * renderer);

static void NDS_DestroyTexture(SDL_Renderer * renderer,

SDL_Texture * texture);

static void NDS_DestroyRenderer(SDL_Renderer * renderer);

SDL_RenderDriver NDS_RenderDriver = {

NDS_CreateRenderer,

{"nds", /* char* name */

(SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTDISCARD | SDL_RENDERER_PRESENTVSYNC), /* u32 flags */

(SDL_TEXTUREMODULATE_NONE), /* u32 mod_modes */

(SDL_TEXTURESCALEMODE_FAST), /* u32 scale_modes */

3, /* u32 num_texture_formats */

{

SDL_PIXELFORMAT_INDEX8,

SDL_PIXELFORMAT_ABGR1555,

SDL_PIXELFORMAT_BGR555,

(256), /* int max_texture_width */

(256), /* int max_texture_height */

}

};

typedef struct

{

u8 bg_taken[4];

int sub;

} NDS_RenderData;

typedef struct

{

enum

{ NDSTX_BG, NDSTX_SPR } type; /* represented in a bg or sprite. */

int hw_index; /* index of sprite in OAM or bg from libnds */

int pitch, bpp; /* useful information about the texture */

struct { int x,y; } scale; /* x/y stretch (24.8 fixed point) */

struct { int x,y; } scroll; /* x/y offset */

int rotate; /* -32768 to 32767, texture rotation */

u16 *vram_pixels; /* where the pixel data is stored (a pointer into VRAM) */

u16 *vram_palette; /* where the palette data is stored if it's indexed. */

/*int size; */

} NDS_TextureData;

SDL_Renderer *

NDS_CreateRenderer(SDL_Window * window, Uint32 flags)

{

SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

SDL_DisplayMode *displayMode = &display->current_mode;

SDL_Renderer *renderer;

NDS_RenderData *data;

int i, n;

int bpp;

Uint32 Rmask, Gmask, Bmask, Amask;

if (!SDL_PixelFormatEnumToMasks(displayMode->format, &bpp,

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

SDL_SetError("Unknown display format");

return NULL;

}

switch (displayMode->format) {

case SDL_PIXELFORMAT_INDEX8:

case SDL_PIXELFORMAT_ABGR1555:

case SDL_PIXELFORMAT_BGR555:

/* okay */

break;

case SDL_PIXELFORMAT_RGB555:

case SDL_PIXELFORMAT_RGB565:

case SDL_PIXELFORMAT_ARGB1555:

/* we'll take these too for now */

break;

default:

SDL_SetError("Warning: wrong display format for NDS!\n");

break;

}

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

if (!renderer) {

SDL_OutOfMemory();

return NULL;

}

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

if (!data) {

NDS_DestroyRenderer(renderer);

SDL_OutOfMemory();

return NULL;

}

SDL_zerop(data);

renderer->RenderFill = NDS_RenderFill;

renderer->RenderCopy = NDS_RenderCopy;

renderer->RenderPresent = NDS_RenderPresent;

renderer->DestroyRenderer = NDS_DestroyRenderer;

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

renderer->info.flags = 0;

renderer->window = window->id;

renderer->driverdata = data;

renderer->CreateTexture = NDS_CreateTexture;

renderer->QueryTexturePixels = NDS_QueryTexturePixels;

renderer->SetTexturePalette = NDS_SetTexturePalette;

renderer->GetTexturePalette = NDS_GetTexturePalette;

renderer->SetTextureColorMod = NDS_SetTextureColorMod;

renderer->SetTextureAlphaMod = NDS_SetTextureAlphaMod;

renderer->SetTextureBlendMode = NDS_SetTextureBlendMode;

renderer->SetTextureScaleMode = NDS_SetTextureScaleMode;

renderer->UpdateTexture = NDS_UpdateTexture;

renderer->LockTexture = NDS_LockTexture;

renderer->UnlockTexture = NDS_UnlockTexture;

renderer->DestroyTexture = NDS_DestroyTexture;

renderer->info.mod_modes = NDS_RenderDriver.info.mod_modes;

renderer->info.blend_modes = NDS_RenderDriver.info.blend_modes;

renderer->info.scale_modes = NDS_RenderDriver.info.scale_modes;

renderer->info.num_texture_formats =

NDS_RenderDriver.info.num_texture_formats;

SDL_memcpy(renderer->info.texture_formats,

NDS_RenderDriver.info.texture_formats,

sizeof(renderer->info.texture_formats));

renderer->info.max_texture_width =

NDS_RenderDriver.info.max_texture_width;

renderer->info.max_texture_height =

NDS_RenderDriver.info.max_texture_height;

data->sub = 0; /* TODO: this is hard-coded to the "main" screen.

figure out how to detect whether to set it to

"sub" screen. window->id, perhaps? */

data->bg_taken[2] = data->bg_taken[3] = 0;

return renderer;

}

static int

NDS_ActivateRenderer(SDL_Renderer * renderer)

{

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

return 0;

}

static int

NDS_DisplayModeChanged(SDL_Renderer * renderer)

{

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

return 0;

}

static int

NDS_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

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

NDS_TextureData *txdat = NULL;

int i;

int bpp;

Uint32 Rmask, Gmask, Bmask, Amask;

if (!SDL_PixelFormatEnumToMasks

(texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {

SDL_SetError("Unknown texture format");

return -1;

}

/* conditional statements on w/h to place it as bg/sprite

depending on which one it fits. */

if (texture->w <= 64 && texture->h <= 64) {

int whichspr = -1;

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

if (data->oam_copy.spriteBuffer[i].attribute[0] & ATTR0_DISABLED) {

whichspr = i;

break;

}

}

if (whichspr >= 0) {

SpriteEntry *sprent = &(data->oam_copy.spriteBuffer[whichspr]);

int maxside = texture->w > texture->h ? texture->w : texture->h;

int pitch;

texture->driverdata = SDL_calloc(1, sizeof(NDS_TextureData));

txdat = (NDS_TextureData *) texture->driverdata;

if (!txdat) {

SDL_OutOfMemory();

return -1;

}

sprent->objMode = OBJMODE_BITMAP;

sprent->posX = 0;

sprent->posY = 0;

sprent->colMode = OBJCOLOR_16; /* OBJCOLOR_256 for INDEX8 */

/* the first 32 sprites get transformation matrices.

first come, first served */

if (whichspr < MATRIX_COUNT) {

sprent->isRotoscale = 1;

sprent->rsMatrixIdx = whichspr;

}

/* containing shape (square or 2:1 rectangles) */

sprent->objShape = OBJSHAPE_SQUARE;

if (texture->w / 2 >= texture->h) {

sprent->objShape = OBJSHAPE_WIDE;

} else if (texture->h / 2 >= texture->w) {

sprent->objShape = OBJSHAPE_TALL;

}

/* size in pixels */

/* FIXME: "pitch" is hardcoded for 2bytes per pixel. */

sprent->objSize = OBJSIZE_64;

pitch = 128;

if (maxside <= 8) {

sprent->objSize = OBJSIZE_8;

pitch = 16;

} else if (maxside <= 16) {

sprent->objSize = OBJSIZE_16;

pitch = 32;

} else if (maxside <= 32) {

sprent->objSize = OBJSIZE_32;

pitch = 64;

}

/* FIXME: this is hard-coded and will obviously only work for one

sprite-texture. tells it to look at the beginning of SPRITE_GFX

for its pixels. */

sprent->tileIdx = 0;

/* now for the texture data */

txdat->type = NDSTX_SPR;

txdat->hw_index = whichspr;

txdat->dim.hdx = 0x100;

txdat->dim.hdy = 0;

txdat->dim.vdx = 0;

txdat->dim.vdy = 0x100;

txdat->dim.pitch = pitch;

txdat->dim.bpp = bpp;

txdat->vram_pixels = (u16 *) (data->sub ? SPRITE_GFX_SUB : SPRITE_GFX);

/* FIXME: use tileIdx*boundary

to point to proper location */

} else {

SDL_SetError("Out of NDS sprites.");

}

} else if (texture->w <= 256 && texture->h <= 256) {

int whichbg = -1, base = 0;

if (!data->bg_taken[2]) {

whichbg = 2;

} else if (!data->bg_taken[3]) {

whichbg = 3;

base = 4;

}

if (whichbg >= 0) {

texture->driverdata = SDL_calloc(1, sizeof(NDS_TextureData));

txdat = (NDS_TextureData *) texture->driverdata;

if (!txdat) {

SDL_OutOfMemory();

return -1;

}

// hard-coded for 256x256 for now...

// TODO: a series of if-elseif-else's to find the closest but larger size.

if(!data->sub) {

if(bpp==8) {

txdat->hw_index = bgInit(whichbg, BgType_Bmp8, BgSize_B8_256x256, 0, 0);

} else {

txdat->hw_index = bgInit(whichbg, BgType_Bmp16, BgSize_B16_256x256, 0, 0);

}

} else {

if(bpp==8) {

txdat->hw_index = bgInitSub(whichbg, BgType_Bmp8, BgSize_B8_256x256, 0, 0);

} else {

txdat->hw_index = bgInitSub(whichbg, BgType_Bmp16, BgSize_B16_256x256, 0, 0);

}

}

/* useful functions

bgGetGfxPtr(bg3);

bgSetCenter(bg3, rcX, rcY);

bgSetRotateScale(bg3, angle, scaleX, scaleY);

bgSetScroll(bg3, scrollX, scrollY);

bgUpdate(bg3);

*/

txdat->pitch = (texture->w)*(bpp/8);

txdat->bpp = bpp;

txdat->rotate = 0;

txdat->scale.x = 0x100;

txdat->scale.y = 0x100;

txdat->scroll.x = 0;

txdat->scroll.y = 0;

txdat->vram_pixels = (u16*)bgGetGfxPtr(txdat->hw_index);

bgSetCenter(txdat->hw_index, 0, 0);

bgSetRotateScale(txdat->hw_index, txdat->rotate, txdat->scale.x,

txdat->scale.y);

bgSetScroll(txdat->hw_index, txdat->scroll.x, txdat->scroll.y);

bgUpdate(txdat->hw_index);

data->bg_taken[whichbg] = 1;

/*txdat->size = txdat->dim.pitch * texture->h; */

} else {

SDL_SetError("Out of NDS backgrounds.");

}

} else {

SDL_SetError("Texture too big for NDS hardware.");

}

if (!texture->driverdata) {

return -1;

}

return 0;

}

static int

NDS_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,

void **pixels, int *pitch)

{

NDS_TextureData *txdat = (NDS_TextureData *) texture->driverdata;

*pixels = txdat->vram_pixels;

return 0;

}

static int

NDS_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, const void *pixels, int pitch)

{

NDS_TextureData *txdat;

Uint8 *src, *dst;

int row;

size_t length;

txdat = (NDS_TextureData *) texture->driverdata;

src = (Uint8 *) pixels;

dst =

(Uint8 *) txdat->vram_pixels + rect->y * txdat->pitch + rect->x *

((txdat->bpp + 1) / 8);

length = rect->w * ((txdat->bpp + 1) / 8);

if (rect->w == texture->w) {

dmaCopy(src, dst, length * rect->h);

} else {

for (row = 0; row < rect->h; ++row) {

dmaCopy(src, dst, length);

src += pitch;

}

}

return 0;

}

static int

NDS_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, int markDirty, void **pixels,

int *pitch)

{

NDS_TextureData *txdat = (NDS_TextureData *) texture->driverdata;

*pixels = (void *) ((u8 *) txdat->vram_pixels + rect->y * txdat->pitch +

rect->x * ((txdat->bpp + 1) / 8));

*pitch = txdat->pitch;

return 0;

}

static void

NDS_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

/* stub! */

}

static int

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

Uint8 a, const SDL_Rect * rect)

{

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

SDL_Rect real_rect = *rect;

u16 color;

int i, j;

printf("NDS_RenderFill: stub\n");

color = RGB8(r, g, b); /* macro in libnds that makes an ARGB1555 pixel */

/* TODO: make a single-color sprite and stretch it.

calculate the "HDX" width modifier of the sprite by:

let S be the actual sprite's width (like, 32 pixels for example)

let R be the rectangle's width (maybe 50 pixels)

HDX = (R<<8) / S;

(it's fixed point, hence the bit shift. same goes for vertical.

be sure to use 32-bit int's for the bit shift before the division!)

*/

return 0;

}

static int

NDS_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * srcrect, const SDL_Rect * dstrect)

{

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

NDS_TextureData *txdat = (NDS_TextureData *) texture->driverdata;

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

SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

if (txdat->type == NDSTX_BG) {

txdat->scroll.x = dstrect->x;

txdat->scroll.y = dstrect->y;

} else {

/* sprites not fully implemented yet */

printf("NDS_RenderCopy: used sprite!\n");

// SpriteEntry *spr = &(data->oam_copy.spriteBuffer[txdat->hw_index]);

// spr->posX = dstrect->x;

// spr->posY = dstrect->y;

// if (txdat->hw_index < MATRIX_COUNT && spr->isRotoscale) {

// }

}

return 0;

}

static void

NDS_RenderPresent(SDL_Renderer * renderer)

{

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

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

SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

/* update sprites */

/* vsync for NDS */

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

swiWaitForVBlank();

}

}

static void

NDS_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

NDS_TextureData *txdat = texture->driverdata;

/* free anything else allocated for texture */

SDL_free(txdat);

}

static void

NDS_DestroyRenderer(SDL_Renderer * renderer)

{

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

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

SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

int i;

if (data) {

/* free anything else relevant if anything else is allocated. */

SDL_free(data);

}

SDL_free(renderer);

}

static int

NDS_SetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Color * colors, int firstcolor, int ncolors)

{

NDS_TextureData *txdat = (NDS_TextureData *) texture->driverdata;

/* set 8-bit modes in the background control registers

for backgrounds, BGn_CR |= BG_256_COLOR */

return 0;

}

static int

NDS_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,

SDL_Color * colors, int firstcolor, int ncolors)

{

NDS_TextureData *txdat = (NDS_TextureData *) texture->driverdata;

/* stub! */

return 0;

}

static int

NDS_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)

{

/* stub! */

return 0;

}

static int

NDS_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)

{

/* stub! */

return 0;

}

static int

NDS_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)

{

/* stub! */

return 0;

}

static int

NDS_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture)

{

/* stub! (note: NDS hardware scaling is nearest neighbor.) */

return 0;

}

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