/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2011 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"

/* SDL Nintendo DS video driver implementation

* based on dummy driver:

* 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 <fat.h>

#include <gl2d.h>

#include "SDL_video.h"

#include "SDL_ndsvideo.h"

#include "SDL_ndsevents_c.h"

#include "../../render/SDL_sysrender.h"

#include "SDL_log.h"

#define NDSVID_DRIVER_NAME "nds"

static SDL_DisplayMode display_modes[] =

{

/* Only one screen */

{

.format = SDL_PIXELFORMAT_ABGR1555,

.w = SCREEN_WIDTH,

.h = SCREEN_HEIGHT,

.refresh_rate = 60,

},

/* Aggregated display (two screens) with no gap. */

{

.format = SDL_PIXELFORMAT_ABGR1555,

.w = SCREEN_WIDTH,

.h = 2*SCREEN_HEIGHT+SCREEN_GAP,

.refresh_rate = 60,

},

/* Aggregated display (two screens) with a gap. */

{

.format = SDL_PIXELFORMAT_ABGR1555,

.w = SCREEN_WIDTH,

.h = 2*SCREEN_HEIGHT,

.refresh_rate = 60,

},

/* Last entry */

{

.w = 0,

}

};

/* This function must not be optimized nor inlined, else the pointer

* to the message will be in the wrong register, and the emulator won't

* find the string. */

__attribute__ ((noinline, optimize (0)))

static void NDS_DebugOutput2(const char* message)

{

#ifdef __thumb__

asm volatile ("swi #0xfc");

#else

asm volatile ("swi #0xfc0000");

#endif

}

static void NDS_DebugOutput(void *userdata, int category, SDL_LogPriority priority, const char *message)

{

NDS_DebugOutput2(message);

}

/* SDL NDS driver bootstrap functions */

static int NDS_Available(void)

{

return 1; /* always here */

}

#ifndef USE_HW_RENDERER

static int NDS_CreateWindowFramebuffer(_THIS, SDL_Window *window,

Uint32 *format, void **pixels,

int *pitch)

{

struct NDS_WindowData *wdata;

int bpp;

Uint32 Rmask, Gmask, Bmask, Amask;

const SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);

const SDL_DisplayMode *mode = display->driverdata;

const Uint32 fmt = mode->format;

if (fmt != SDL_PIXELFORMAT_ABGR1555) {

SDL_SetError("Unsupported pixel format (%x)", fmt);

return -1;

}

if (!SDL_PixelFormatEnumToMasks

(fmt, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {

SDL_SetError("Unknown texture format");

return -1;

}

wdata = SDL_calloc(1, sizeof(struct NDS_WindowData));

if (!wdata) {

SDL_OutOfMemory();

return -1;

}

if (bpp == 8) {

wdata->pixels_length = (SCREEN_HEIGHT+SCREEN_GAP+SCREEN_HEIGHT)*SCREEN_WIDTH;

} else {

wdata->pixels_length = (SCREEN_HEIGHT+SCREEN_GAP+SCREEN_HEIGHT)*SCREEN_WIDTH*2;

}

wdata->pixels = SDL_calloc(1, wdata->pixels_length);

if (!wdata->pixels) {

SDL_free(wdata);

SDL_SetError("Not enough memory");

return -1;

}

if (bpp == 8) {

wdata->main.bg_id = bgInit(2, BgType_Bmp8, BgSize_B8_256x256, 0, 0);

wdata->sub.bg_id = bgInitSub(3, BgType_Bmp8, BgSize_B8_256x256, 0, 0);

wdata->main.length = SCREEN_HEIGHT*SCREEN_WIDTH;

wdata->main.pixels = wdata->pixels;

wdata->sub.length = SCREEN_HEIGHT*SCREEN_WIDTH;

wdata->sub.pixels = (u8 *)wdata->pixels + wdata->main.length; /* or ...+SCREEN_GAP */

} else {

wdata->main.bg_id = bgInit(2, BgType_Bmp16, BgSize_B16_256x256, 0, 0);

wdata->sub.bg_id = bgInitSub(3, BgType_Bmp16, BgSize_B16_256x256, 0, 0);

wdata->main.length = SCREEN_HEIGHT*SCREEN_WIDTH*2;

wdata->main.pixels = wdata->pixels;

wdata->sub.length = SCREEN_HEIGHT*SCREEN_WIDTH*2;

wdata->sub.pixels = (u8 *)wdata->pixels + wdata->main.length; /* or ...+SCREEN_GAP */

}

wdata->pitch = (window->w) * ((bpp+1) / 8);

wdata->bpp = bpp;

wdata->rotate = 0;

wdata->scale.x = 0x100;

wdata->scale.y = 0x100;

wdata->scroll.x = 0;

wdata->scroll.y = 0;

wdata->main.vram_pixels = bgGetGfxPtr(wdata->main.bg_id);

wdata->sub.vram_pixels = bgGetGfxPtr(wdata->sub.bg_id);

#if 0

bgSetCenter(wdata->main.bg_id, 0, 0);

bgSetRotateScale(wdata->main.bg_id, wdata->rotate, wdata->scale.x,

wdata->scale.y);

bgSetScroll(wdata->main.bg_id, wdata->scroll.x, wdata->scroll.y);

#endif

#if 0

bgSetCenter(wdata->sub.bg_id, 0, 0);

bgSetRotateScale(wdata->sub.bg_id, wdata->rotate, wdata->scale.x,

wdata->scale.y);

bgSetScroll(wdata->sub.bg_id, wdata->scroll.x, wdata->scroll.y);

#endif

bgUpdate();

*format = fmt;

*pixels = wdata->pixels;

*pitch = wdata->pitch;

window->driverdata = wdata;

return 0;

}

static int NDS_UpdateWindowFramebuffer(_THIS, SDL_Window * window,

SDL_Rect * rects, int numrects)

{

struct NDS_WindowData *wdata = window->driverdata;

/* Copy everything. TODO: use rects/numrects. */

DC_FlushRange(wdata->pixels, wdata->pixels_length);

swiWaitForVBlank();

dmaCopy(wdata->main.pixels, wdata->main.vram_pixels, wdata->main.length);

dmaCopy(wdata->sub.pixels, wdata->sub.vram_pixels, wdata->sub.length);

return 0;

}

static void NDS_DestroyWindowFramebuffer(_THIS, SDL_Window *window)

{

struct NDS_WindowData *wdata = window->driverdata;

SDL_free(wdata->pixels);

SDL_free(wdata);

}

#endif

#ifdef USE_HW_RENDERER

/* Set up a 2D layer construced of bitmap sprites. This holds the

* image when rendering to the top screen. From libnds example.

*/

static void initSubSprites(void)

{

oamInit(&oamSub, SpriteMapping_Bmp_2D_256, false);

int x = 0;

int y = 0;

int id = 0;

//set up a 4x3 grid of 64x64 sprites to cover the screen

for(y = 0; y < 3; y++)

for(x = 0; x < 4; x++)

{

oamSub.oamMemory[id].attribute[0] = ATTR0_BMP | ATTR0_SQUARE | (64 * y);

oamSub.oamMemory[id].attribute[1] = ATTR1_SIZE_64 | (64 * x);

oamSub.oamMemory[id].attribute[2] = ATTR2_ALPHA(1) | (8 * 32 * y) | (8 * x);

id++;

}

swiWaitForVBlank();

oamUpdate(&oamSub);

}

#endif

static int NDS_SetDisplayMode(_THIS, SDL_VideoDisplay *display, SDL_DisplayMode *mode)

{

display->driverdata = mode->driverdata;

#ifdef USE_HW_RENDERER

videoSetMode(MODE_5_3D);

videoSetModeSub(MODE_5_2D);

/* initialize gl2d */

glScreen2D();

vramSetBankA(VRAM_A_TEXTURE);

vramSetBankB(VRAM_B_TEXTURE );

vramSetBankC(VRAM_C_SUB_BG_0x06200000);

vramSetBankE(VRAM_E_TEX_PALETTE);

powerOn(POWER_ALL_2D);

irqInit();

irqEnable(IRQ_VBLANK);

// sub sprites hold the bottom image when 3D directed to top

initSubSprites();

// sub background holds the top image when 3D directed to bottom

bgInitSub(3, BgType_Bmp16, BgSize_B16_256x256, 0, 0);

#else

/* Select mode 5 for both screens. Can do Extended Rotation

* Background on both (BG 2 and 3). */

videoSetMode(MODE_5_2D);

videoSetModeSub(MODE_5_2D);

vramSetBankA(VRAM_A_MAIN_BG_0x06000000);

vramSetBankB(VRAM_B_TEXTURE );

vramSetBankC(VRAM_C_SUB_BG_0x06200000);

vramSetBankE(VRAM_E_TEX_PALETTE);

powerOn(POWER_ALL_2D);

irqInit();

irqEnable(IRQ_VBLANK);

#endif

return 0;

}

void NDS_GetDisplayModes(_THIS, SDL_VideoDisplay * display)

{

SDL_DisplayMode *mode;

for (mode = display_modes; mode->w; mode++) {

mode->driverdata = mode; /* point back to self */

SDL_AddDisplayMode(display, mode);

}

}

static int NDS_VideoInit(_THIS)

{

SDL_VideoDisplay display;

SDL_DisplayMode mode;

SDL_zero(mode);

mode.format = SDL_PIXELFORMAT_UNKNOWN; // shoud be SDL_PIXELFORMAT_ABGR1555;

mode.w = SCREEN_WIDTH;

mode.h = 2*SCREEN_HEIGHT+SCREEN_GAP;

mode.refresh_rate = 60;

SDL_zero(display);

display.desktop_mode = mode;

SDL_AddVideoDisplay(&display);

return 0;

}

static void NDS_VideoQuit(_THIS)

{

videoSetMode(DISPLAY_SCREEN_OFF);

videoSetModeSub(DISPLAY_SCREEN_OFF);

vramSetBankA(VRAM_A_LCD);

vramSetBankB(VRAM_B_LCD);

vramSetBankC(VRAM_C_LCD);

vramSetBankD(VRAM_D_LCD);

vramSetBankE(VRAM_E_LCD);

vramSetBankF(VRAM_F_LCD);

vramSetBankG(VRAM_G_LCD);

vramSetBankH(VRAM_H_LCD);

vramSetBankI(VRAM_I_LCD);

}

static void NDS_DeleteDevice(SDL_VideoDevice * device)

{

SDL_free(device);

}

static SDL_VideoDevice *NDS_CreateDevice(int devindex)

{

SDL_VideoDevice *device;

fatInitDefault();

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

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

if (!device) {

SDL_OutOfMemory();

return NULL;

}

device->driverdata = SDL_calloc(1, sizeof(SDL_VideoDevice));

if (!device) {

SDL_free(device);

SDL_OutOfMemory();

return NULL;

}

/* Set the function pointers */

device->VideoInit = NDS_VideoInit;

device->VideoQuit = NDS_VideoQuit;

device->GetDisplayModes = NDS_GetDisplayModes;

device->SetDisplayMode = NDS_SetDisplayMode;

device->PumpEvents = NDS_PumpEvents;

#ifndef USE_HW_RENDERER

device->CreateWindowFramebuffer = NDS_CreateWindowFramebuffer;

device->UpdateWindowFramebuffer = NDS_UpdateWindowFramebuffer;

device->DestroyWindowFramebuffer = NDS_DestroyWindowFramebuffer;

#endif

device->free = NDS_DeleteDevice;

/* Set the debug output. Use only for under an emulator. Will crash the DS. */

#if 1

SDL_LogSetOutputFunction(NDS_DebugOutput, NULL);

#endif

return device;

}

VideoBootStrap NDS_bootstrap = {

NDSVID_DRIVER_NAME, "SDL NDS video driver",

NDS_Available, NDS_CreateDevice

};

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