--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/video/nds/SDL_ndsrender.c	Wed Aug 27 15:10:03 2008 +0000
@@ -0,0 +1,660 @@
+/*
+    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 <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"
+
+/* NDS sprite-related functions */
+#define SPRITE_DMA_CHANNEL 3
+#define SPRITE_ANGLE_MASK 0x01FF
+
+void
+NDS_OAM_Update(tOAM * oam, int sub)
+{
+    DC_FlushAll();
+    dmaCopyHalfWords(SPRITE_DMA_CHANNEL, oam->spriteBuffer,
+                     sub ? OAM_SUB : OAM, SPRITE_COUNT * sizeof(SpriteEntry));
+}
+
+void
+NDS_OAM_RotateSprite(SpriteRotation * spriteRotation, u16 angle)
+{
+    s16 s = SIN[angle & SPRITE_ANGLE_MASK] >> 4;
+    s16 c = COS[angle & SPRITE_ANGLE_MASK] >> 4;
+
+    spriteRotation->hdx = c;
+    spriteRotation->hdy = s;
+    spriteRotation->vdx = -s;
+    spriteRotation->vdy = c;
+}
+
+void
+NDS_OAM_Init(tOAM * oam, int sub)
+{
+    int i;
+    for (i = 0; i < SPRITE_COUNT; i++) {
+        oam->spriteBuffer[i].attribute[0] = ATTR0_DISABLED;
+        oam->spriteBuffer[i].attribute[1] = 0;
+        oam->spriteBuffer[i].attribute[2] = 0;
+    }
+    for (i = 0; i < MATRIX_COUNT; i++) {
+        NDS_OAM_RotateSprite(&(oam->matrixBuffer[i]), 0);
+    }
+    swiWaitForVBlank();
+    NDS_OAM_Update(oam, sub);
+}
+
+void
+NDS_OAM_HideSprite(SpriteEntry * spriteEntry)
+{
+    spriteEntry->isRotoscale = 0;
+    spriteEntry->isHidden = 1;
+}
+
+void
+NDS_OAM_ShowSprite(SpriteEntry * spriteEntry, int affine, int double_bound)
+{
+    if (affine) {
+        spriteEntry->isRotoscale = 1;
+        spriteEntry->rsDouble = double_bound;
+    } else {
+        spriteEntry->isHidden = 0;
+    }
+}
+
+
+/* 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 void NDS_DirtyTexture(SDL_Renderer * renderer,
+                             SDL_Texture * texture, int numrects,
+                             const SDL_Rect * rects);
+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_TEXTUREBLENDMODE_MASK),       /* u32 blend_modes */
+     (SDL_TEXTURESCALEMODE_FAST),       /* u32 scale_modes */
+     3,                         /* u32 num_texture_formats */
+     {
+      SDL_PIXELFORMAT_INDEX8,
+      SDL_PIXELFORMAT_ABGR1555,
+      SDL_PIXELFORMAT_BGR555,
+      },                        /* u32 texture_formats[20] */
+     (256),                     /* int max_texture_width */
+     (256),                     /* int max_texture_height */
+     }
+};
+
+typedef struct
+{
+    bg_attribute *bg;           /* backgrounds */
+    tOAM oam_copy;              /* sprites */
+    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;               /* sprite: index in the OAM. /  bg: 2 or 3. */
+    struct
+    {
+        int hdx, hdy, vdx, vdy; /* affine transformation, used for scaling. */
+        int pitch, bpp;         /* some useful info */
+    } dim;
+    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->DirtyTexture = NDS_DirtyTexture;
+    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? */
+    if (!data->sub) {
+        data->bg = &BACKGROUND;
+    } else {
+        data->bg = &BACKGROUND_SUB;
+    }
+    data->bg_taken[2] = data->bg_taken[3] = 0;
+
+    NDS_OAM_Init(&(data->oam_copy), data->sub); /* init sprites. */
+
+    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;
+        printf("Tried to make a sprite.\n");
+        txdat->type = NDSTX_SPR;
+        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;
+            }
+
+            /* this is hard-coded to being 256x256 ABGR1555 for now. */
+            data->bg->control[whichbg] = (bpp == 8) ?
+                BG_BMP8_256x256 : BG_BMP16_256x256;
+
+            data->bg->control[whichbg] |= BG_BMP_BASE(base);
+
+            data->bg->scroll[whichbg].x = 0;
+            data->bg->scroll[whichbg].y = 0;
+
+            txdat->type = NDSTX_BG;
+            txdat->hw_index = whichbg;
+            txdat->dim.hdx = 0x100;
+            txdat->dim.hdy = 0;
+            txdat->dim.vdx = 0;
+            txdat->dim.vdy = 0x100;
+            txdat->dim.pitch = 512;
+            txdat->dim.bpp = bpp;
+            txdat->vram_pixels = (u16 *) (data->sub ?
+                                          BG_BMP_RAM_SUB(base) :
+                                          BG_BMP_RAM(base));
+
+            /*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;
+    *pitch = txdat->dim.pitch;
+    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->dim.pitch +
+        rect->x * ((txdat->dim.bpp + 1) / 8);
+    length = rect->w * ((txdat->dim.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;
+            dst += txdat->dim.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->dim.pitch +
+                        rect->x * ((txdat->dim.bpp + 1) / 8));
+    *pitch = txdat->dim.pitch;
+
+    return 0;
+}
+
+static void
+NDS_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
+{
+    /* stub! */
+}
+
+static void
+NDS_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
+                 int numrects, const SDL_Rect * rects)
+{
+    /* 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;
+
+    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);
+    int i;
+    int bpp = SDL_BYTESPERPIXEL(texture->format);
+    int pitch = txdat->dim.pitch;
+
+    if (txdat->type == NDSTX_BG) {
+        bg_rotation *bgrot = (txdat->hw_index == 2) ?
+            &(data->bg->bg2_rotation) : &(data->bg->bg3_rotation);
+        bgrot->xdx = txdat->dim.hdx;
+        bgrot->xdy = txdat->dim.hdy;
+        bgrot->ydx = txdat->dim.vdx;
+        bgrot->ydy = txdat->dim.vdy;
+        bgrot->centerX = 0;
+        bgrot->centerY = 0;
+
+        data->bg->scroll[txdat->hw_index].x = dstrect->x;
+        data->bg->scroll[txdat->hw_index].y = dstrect->y;
+    } else {
+        /* sprites not fully implemented yet */
+        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) {
+            SpriteRotation *sprot =
+                &(data->oam_copy.matrixBuffer[txdat->hw_index]);
+            sprot->hdx = txdat->dim.hdx;
+            sprot->hdy = txdat->dim.hdy;
+            sprot->vdx = txdat->dim.vdx;
+            sprot->vdy = txdat->dim.vdy;
+        }
+    }
+
+    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 */
+    NDS_OAM_Update(&(data->oam_copy), data->sub);
+    /* 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: */