[sdl_omap.git] / src / video / nds / SDL_ndsvideo.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 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"

#include <nds.h>
#include <nds/registers_alt.h>
#include "SDL.h"
#include "SDL_error.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_ndsmouse_c.h"

#define NDSVID_DRIVER_NAME "nds"

/* Initialization/Query functions */
static int NDS_VideoInit(_THIS, SDL_PixelFormat *vformat);
static SDL_Rect **NDS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
static SDL_Surface *NDS_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
static int NDS_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
static void NDS_VideoQuit(_THIS);

/* Hardware surface functions */
static int NDS_AllocHWSurface(_THIS, SDL_Surface *surface);
static int NDS_LockHWSurface(_THIS, SDL_Surface *surface);
static int NDS_FlipHWSurface(_THIS, SDL_Surface *surface);
static void NDS_UnlockHWSurface(_THIS, SDL_Surface *surface);
static void NDS_FreeHWSurface(_THIS, SDL_Surface *surface);

/* etc. */
static void NDS_UpdateRects(_THIS, int numrects, SDL_Rect *rects);

/* NDS driver bootstrap functions */

static int NDS_Available(void)
{
	return(1);
}

static void NDS_DeleteDevice(SDL_VideoDevice *device)
{
	SDL_free(device->hidden);
	SDL_free(device);
}

void on_irq_vblank() 
{	
  // Disable interrupts
  //REG_IME = 0;
  scanKeys();

  //  VBLANK_INTR_WAIT_FLAGS |= IRQ_VBLANK; 
  //  REG_IF |= IRQ_VBLANK; 
  //REG_IF = REG_IF;

  // Enable interrupts
  //REG_IME = 1;
}

static int HWAccelBlit(SDL_Surface *src, SDL_Rect *srcrect,
                        SDL_Surface *dst, SDL_Rect *dstrect)
 {
	return 0;
 }
 
static int CheckHWBlit(_THIS, SDL_Surface *src, SDL_Surface *dst)
{
 	if (src->flags & SDL_SRCALPHA) return false;
 	if (src->flags & SDL_SRCCOLORKEY) return false;
 	if (src->flags & SDL_HWPALETTE ) return false;
 	if (dst->flags & SDL_SRCALPHA) return false;
 	if (dst->flags & SDL_SRCCOLORKEY) return false;
 	if (dst->flags & SDL_HWPALETTE ) return false;

 	if (src->format->BitsPerPixel != dst->format->BitsPerPixel) return false;
 	if (src->format->BytesPerPixel != dst->format->BytesPerPixel) return false;
 		
        src->map->hw_blit = HWAccelBlit;
        return true;
}

static SDL_VideoDevice *NDS_CreateDevice(int devindex)
{
	SDL_VideoDevice *device=0;


	/* Initialize all variables that we clean on shutdown */
	device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));
	if ( device ) {
		SDL_memset(device, 0, (sizeof *device));
		device->hidden = (struct SDL_PrivateVideoData *)
				SDL_malloc((sizeof *device->hidden));
	}
	if ( (device == NULL) || (device->hidden == NULL) ) {
		SDL_OutOfMemory();
		if ( device ) {
			SDL_free(device);
		}
		return(0);
	} 
	SDL_memset(device->hidden, 0, (sizeof *device->hidden));

	/* Set the function pointers */
	device->VideoInit = NDS_VideoInit;
	device->ListModes = NDS_ListModes;
	device->SetVideoMode = NDS_SetVideoMode;
	device->CreateYUVOverlay = NULL;
	device->SetColors = NDS_SetColors;
	device->UpdateRects = NDS_UpdateRects;
	device->VideoQuit = NDS_VideoQuit;
	device->AllocHWSurface = NDS_AllocHWSurface;
	device->CheckHWBlit = CheckHWBlit;
	device->FillHWRect = NULL;
	device->SetHWColorKey = NULL;
	device->SetHWAlpha = NULL;
	device->LockHWSurface = NDS_LockHWSurface;
	device->UnlockHWSurface = NDS_UnlockHWSurface;
	device->FlipHWSurface = NDS_FlipHWSurface;
	device->FreeHWSurface = NDS_FreeHWSurface;
	device->SetCaption = NULL;
	device->SetIcon = NULL;
	device->IconifyWindow = NULL;
	device->GrabInput = NULL;
	device->GetWMInfo = NULL;
	device->InitOSKeymap = NDS_InitOSKeymap;
	device->PumpEvents = NDS_PumpEvents;
	device->info.blit_hw=1;

	device->free = NDS_DeleteDevice;
	return device;
}

VideoBootStrap NDS_bootstrap = {
	NDSVID_DRIVER_NAME, "SDL NDS video driver",
	NDS_Available, NDS_CreateDevice
};

	u16* frontBuffer;// = (u16*)(0x06000000);
	u16* backBuffer;// =  (u16*)(0x06000000 + 256 * 256 * 2); 
int NDS_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
	//printf("WARNING: You are using the SDL NDS video driver!\n");

	/* Determine the screen depth (use default 8-bit depth) */
	/* we change this during the SDL_SetVideoMode implementation... */
	vformat->BitsPerPixel = 16;	// mode 3
	vformat->BytesPerPixel = 2;
	vformat->Rmask = 0x0000f800;
	vformat->Gmask = 0x000007e0;
	vformat->Bmask = 0x0000001f; 
    powerON(POWER_ALL);
	irqInit();
	irqSet(IRQ_VBLANK, on_irq_vblank); 
	irqEnable(IRQ_VBLANK);

    //set the mode for 2 text layers and two extended background layers
	//videoSetMode(MODE_5_2D | DISPLAY_BG3_ACTIVE); 
	videoSetMode(MODE_6_2D| DISPLAY_BG2_ACTIVE); 
	
	//set the sub background up for text display (we could just print to one
	//of the main display text backgrounds just as easily
	videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE); //sub bg 0 will be used to print text
	
    //set the first two banks as background memory and the third as sub background memory
    //D is not used..if you need a bigger background then you will need to map
    //more vram banks consecutivly (VRAM A-D are all 0x20000 bytes in size)
    //vramSetMainBanks(VRAM_A_MAIN_BG_0x6000000, VRAM_B_MAIN_BG_0x6020000,VRAM_C_SUB_BG , VRAM_D_LCD); 
	vramSetMainBanks(VRAM_A_MAIN_BG,VRAM_B_MAIN_BG,VRAM_C_MAIN_BG,VRAM_D_MAIN_BG);
	//vramSetBankA(VRAM_A_MAIN_BG);
	//vramSetBankB(VRAM_B_MAIN_BG);
	//vramSetBankC(VRAM_C_MAIN_BG);
	//vramSetBankD(VRAM_D_MAIN_BG);
	//vramSetBankE(VRAM_E_MAIN_BG);
	//vramSetBankF(VRAM_F_MAIN_BG);
	//vramSetBankG(VRAM_G_MAIN_BG);
	vramSetBankH(VRAM_H_SUB_BG);
	vramSetBankI(VRAM_I_LCD);
    
	////////////////set up text background for text/////////////////////
    SUB_BG0_CR = BG_MAP_BASE(8);
	
	BG_PALETTE_SUB[255] = RGB15(31,31,31);//by default font will be rendered with color 255
	///////////////set up our bitmap background///////////////////////

	//BG3_CR = BG_BMP16_512x512;
	
	//these are rotation backgrounds so you must set the rotation attributes:
    //these are fixed point numbers with the low 8 bits the fractional part
    //this basicaly gives it a 1:1 translation in x and y so you get a nice flat bitmap
      /*  BG3_XDX = 1<<8;
        BG3_XDY = 0; 
        BG3_YDX = 0;
        BG3_YDY = 1<<8;
    //our bitmap looks a bit better if we center it so scroll down (256 - 192) / 2 
        BG3_CX = 0;
        BG3_CY = 0; 	
		*/
	//consoleInit() is a lot more flexible but this gets you up and running quick
	consoleInitDefault((u16*)SCREEN_BASE_BLOCK_SUB(8), (u16*)CHAR_BASE_BLOCK_SUB(0), 16); 
	

	frontBuffer =(u16*)(0x06000000);
	//backBuffer  =(u16*)(0x06000000 + 1024 * 512*2); 

	//lcdSwap();
	/* We're done! */
	return(0); 
}

SDL_Rect **NDS_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
	return (SDL_Rect **) -1;
}

SDL_Surface *NDS_SetVideoMode(_THIS, SDL_Surface *current,
				int width, int height, int bpp, Uint32 flags)
{
	Uint32 Rmask, Gmask, Bmask, Amask; 

	//if(width > 1024 || height > 512 || bpp > 16)
	//	return(NULL);

	if(bpp >8) {
		bpp=16;
 		Rmask = 0x0000001F;
		Gmask = 0x000003E0;
		Bmask = 0x00007C00;
		Amask = 0x00008000;

		videoSetMode(MODE_5_2D| DISPLAY_BG2_ACTIVE); 

		vramSetMainBanks(VRAM_A_MAIN_BG,VRAM_B_MAIN_BG,VRAM_C_MAIN_BG,VRAM_D_MAIN_BG);

		BG2_CR = BG_BMP16_512x512;
	    BG2_XDX = ((width / 256) << 8) | (width % 256) ; 
        BG2_XDY = 0; 
        BG2_YDX = 0;	
        BG2_YDY = ((height / 192) << 8) | ((height % 192) + (height % 192) / 3) ;
        BG2_CX = 0;
        BG2_CY = 0; 
//        for (i=0;i<256*192;i++)
//	        frontBuffer[i] = RGB15(31,0,0)|BIT(15);
	}
	else
	if(bpp <= 8) {
		bpp=8;
		Rmask = 0x00000000;
		Gmask = 0x00000000; 
		Bmask = 0x00000000;
		BG2_CR = BG_BMP8_1024x512;
        BG2_XDX = ((width / 256) << 8) | (width % 256) ;
        BG2_XDY = 0; 
        BG2_YDX = 0;
        BG2_YDY = ((height / 192) << 8) | ((height % 192) + (height % 192) / 3) ;

	}
	else
		if(bpp < 15) bpp=15;
	if(width<=256) width=256;
	else
		if(width<256) width=256;
	if(height<=192) height=192;
	else
		if(height<192) height=192;
	
	if(bpp==8)
	{
		if(width<256) width=256;
		if(height<192) height=192;
		this->hidden->ndsmode=4;
	}
	
	if(bpp==15)
	{
		if(width<256) this->hidden->ndsmode=5;
		else this->hidden->ndsmode=3; 
	}

	this->hidden->buffer= frontBuffer;//NDS_VRAM_BASE;
	
	//NDS_DISPCNT = NDS_DISP_MODE(this->hidden->ndsmode)|NDS_DISP_BG2;
	
 	//fprintf(stderr,"Setting mode %dx%d (ndsmode %d)\n", width, height,this->hidden->ndsmode);

	// FIXME: How do I tell that 15 bits mode is 555?

	SDL_memset(this->hidden->buffer, 0, 1024 * 512* ((this->hidden->ndsmode==4 || this->hidden->ndsmode==5) ? 2 : 1 ) * ((bpp+7) / 8));

	/* Allocate the new pixel format for the screen */
	if ( ! SDL_ReallocFormat(current, bpp, Rmask, Gmask, Bmask, Amask) ) {
		this->hidden->buffer = NULL;
		SDL_SetError("Couldn't allocate new pixel format for requested mode");
		return(NULL);
	}

	/* Set up the new mode framebuffer */
	current->flags = flags | SDL_FULLSCREEN | SDL_HWSURFACE | (this->hidden->ndsmode > 0 ? SDL_DOUBLEBUF : 0);
	this->hidden->w = current->w = width;
	this->hidden->h = current->h = height;
	current->pixels = frontBuffer;

	if (flags & SDL_DOUBLEBUF) { 
		this->hidden->secondbufferallocd=1;
		backBuffer=(u16*)SDL_malloc(1024*512*2);
		current->pixels = backBuffer; 
	}
	if(bpp==8)
		current->pitch =1024;
	else
		current->pitch =512*2;

	/* We're done */
	return(current);
}

static int NDS_AllocHWSurface(_THIS, SDL_Surface *surface)
{
	if(this->hidden->secondbufferallocd) {
		//printf("double double buffer alloc\n");
		return -1;
	}
	//if(this->hidden->ndsmode==3)
	//{
	//	printf("no 2nd buffer in mode3\n");
	//	return -1;
	//}
	//printf("second buffer\n");
	//this->hidden->secondbufferallocd=1;
	//backBuffer=(u16*)malloc(1024*512*2);
	//surface->pixels = backBuffer; 

	return(0);
}
static void NDS_FreeHWSurface(_THIS, SDL_Surface *surface)
{
	//free(backBuffer);
	this->hidden->secondbufferallocd=0;
}
int z=0;
/* We need to wait for vertical retrace on page flipped displays */
static int NDS_LockHWSurface(_THIS, SDL_Surface *surface)
{
/*
	uint8* a = surface->pixels;
  int i,j;
  a += 5 * SCREEN_WIDTH + 5;
  for( i = 0; i < 195; ++i) {
    uint16* line = a + (SCREEN_WIDTH * i);
    for( j = 0; j < 158; ++j) {
      *line++ = RGB15(155,155,25);
    }
  }
*/
	//if (z <256)
	// BG_PALETTE[z++]=RGB15(255-z,z,255-z);

 
	return(0);
}

static void NDS_UnlockHWSurface(_THIS, SDL_Surface *surface)
{
	return;
}

static int NDS_FlipHWSurface(_THIS, SDL_Surface *surface)
{
	if(this->hidden->secondbufferallocd){
		while(DISP_Y!=192);
	    while(DISP_Y==192); 
		//printf("flip");

		dmaCopyAsynch(backBuffer,frontBuffer,1024*512);
	}
		//printf("flip\n");
        //u16* temp = surface->pixels;
        //surface->pixels = frontBuffer;
        //frontBuffer = temp;
	/*	u8* vram=BG_GFX;
	int x,y;
	for(y = 0; y < 512; y++)
		dmaCopy(&frontBuffer[y*rects->w], &vram[y*512],512);
	//unsigned char buf;
	
	//printf("NDS_FlipHWSurface\n");
	//printf("ptr now: 0x%x\n",surface->pixels);

	    while(DISP_Y!=192);
	    while(DISP_Y==192); 
        //swap
        u16* temp = frontBuffer;
        frontBuffer = backBuffer;
        backBuffer = temp;
        
        //flip 
        //base is 16KB and screen size is 256x256x2 (128KB)
        BG2_CR ^= BG_BMP_BASE( 512 / 16 ); */
/*
	if(surface->pixels == frontBuffer)//NDS_VRAM_BASE)
	{
			while(DISP_Y!=192);
	while(DISP_Y==192); 
        //swap
        u16* temp = backBuffer;
        backBuffer = frontBuffer;
        frontBuffer = temp;
        
        //flip 
        //base is 16KB and screen size is 256x256x2 (128KB)
        BG3_CR ^= BG_BMP_BASE( 128 / 16 ); 
	}
	else
	{

		while(DISP_Y!=192);
	while(DISP_Y==192); 
        //swap
        u16* temp = frontBuffer;
        frontBuffer = backBuffer;
        backBuffer = temp;
        
        //flip 
        //base is 16KB and screen size is 256x256x2 (128KB)
        BG3_CR ^= BG_BMP_BASE( 128 / 16 ); 
		
	}
	*/
	//printf("ptr then: 0x%x\n",surface->pixels);

	//printf("setting dispcnt to 0x%x\n",NDS_DISPCNT = NDS_DISP_MODE(this->hidden->ndsmode)|NDS_DISP_BG2| buf);
	return(0);
}

static void NDS_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
{
	//fprintf(stderr,"update\n");
	/* do nothing. */
	//dmaCopy(frontBuffer,BG_GFX,512*512);
	 /*
	u8* vram=(u8*)BG_GFX;
	int x,y;
	for(y = 0; y < 512; y++)
		dmaCopy(&frontBuffer[y*rects->w], &vram[y*512],512);
	 */

}

int NDS_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
{
	//printf("SetColors\n");
	short r,g,b;
	
	if(this->hidden->ndsmode != 4)
	{
		printf("This is not a palettized mode\n");
		return -1;
	}

	int i,j=firstcolor+ncolors;
	for(i=firstcolor;i<j;i++)
	{
		r=colors[i].r>>3;
		g=colors[i].g>>3;
		b=colors[i].b>>3;
		BG_PALETTE[i]=RGB15(r, g, b);
	} 

	return(0);
}

/* Note:  If we are terminated, this could be called in the middle of
   another SDL video routine -- notably UpdateRects.
*/
void NDS_VideoQuit(_THIS)
{
}
Commit	Line	Data
e14743d1	1	/*
	2	SDL - Simple DirectMedia Layer
	3	Copyright (C) 1997-2009 Sam Lantinga
	4
	5	This library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	This library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with this library; if not, write to the Free Software
	17	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18
	19	Sam Lantinga
	20	slouken@libsdl.org
	21	*/
	22	#include "SDL_config.h"
	23
	24	#include <nds.h>
	25	#include <nds/registers_alt.h>
	26	#include "SDL.h"
	27	#include "SDL_error.h"
	28	#include "SDL_video.h"
	29	#include "SDL_mouse.h"
	30	#include "../SDL_sysvideo.h"
	31	#include "../SDL_pixels_c.h"
	32	#include "../../events/SDL_events_c.h"
	33
	34	#include "SDL_ndsvideo.h"
	35	#include "SDL_ndsevents_c.h"
	36	#include "SDL_ndsmouse_c.h"
	37
	38	#define NDSVID_DRIVER_NAME "nds"
	39
	40	/* Initialization/Query functions */
	41	static int NDS_VideoInit(_THIS, SDL_PixelFormat *vformat);
	42	static SDL_Rect *NDS_ListModes(_THIS, SDL_PixelFormat format, Uint32 flags);
	43	static SDL_Surface NDS_SetVideoMode(_THIS, SDL_Surface current, int width, int height, int bpp, Uint32 flags);
	44	static int NDS_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
	45	static void NDS_VideoQuit(_THIS);
	46
	47	/* Hardware surface functions */
	48	static int NDS_AllocHWSurface(_THIS, SDL_Surface *surface);
	49	static int NDS_LockHWSurface(_THIS, SDL_Surface *surface);
	50	static int NDS_FlipHWSurface(_THIS, SDL_Surface *surface);
	51	static void NDS_UnlockHWSurface(_THIS, SDL_Surface *surface);
	52	static void NDS_FreeHWSurface(_THIS, SDL_Surface *surface);
	53
	54	/* etc. */
	55	static void NDS_UpdateRects(_THIS, int numrects, SDL_Rect *rects);
	56
	57	/* NDS driver bootstrap functions */
	58
	59	static int NDS_Available(void)
	60	{
	61	return(1);
	62	}
	63
	64	static void NDS_DeleteDevice(SDL_VideoDevice *device)
65	{
66	SDL_free(device->hidden);
67	SDL_free(device);
68	}
69
70	void on_irq_vblank()
71	{
72	// Disable interrupts
73	//REG_IME = 0;
74	scanKeys();
75
76	// VBLANK_INTR_WAIT_FLAGS \|= IRQ_VBLANK;
77	// REG_IF \|= IRQ_VBLANK;
78	//REG_IF = REG_IF;
79
80	// Enable interrupts
81	//REG_IME = 1;
82	}
83
84	static int HWAccelBlit(SDL_Surface src, SDL_Rect srcrect,
85	SDL_Surface dst, SDL_Rect dstrect)
86	{
87	return 0;
88	}
89
90	static int CheckHWBlit(_THIS, SDL_Surface src, SDL_Surface dst)
91	{
92	if (src->flags & SDL_SRCALPHA) return false;
93	if (src->flags & SDL_SRCCOLORKEY) return false;
94	if (src->flags & SDL_HWPALETTE ) return false;
95	if (dst->flags & SDL_SRCALPHA) return false;
96	if (dst->flags & SDL_SRCCOLORKEY) return false;
97	if (dst->flags & SDL_HWPALETTE ) return false;
98
99	if (src->format->BitsPerPixel != dst->format->BitsPerPixel) return false;
100	if (src->format->BytesPerPixel != dst->format->BytesPerPixel) return false;
101
102	src->map->hw_blit = HWAccelBlit;
103	return true;
104	}
105
106	static SDL_VideoDevice *NDS_CreateDevice(int devindex)
107	{
108	SDL_VideoDevice *device=0;
109
110
111	/* Initialize all variables that we clean on shutdown */
112	device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));
113	if ( device ) {
114	SDL_memset(device, 0, (sizeof *device));
115	device->hidden = (struct SDL_PrivateVideoData *)
116	SDL_malloc((sizeof *device->hidden));
117	}
118	if ( (device == NULL) \|\| (device->hidden == NULL) ) {
119	SDL_OutOfMemory();
120	if ( device ) {
121	SDL_free(device);
122	}
123	return(0);
124	}
125	SDL_memset(device->hidden, 0, (sizeof *device->hidden));
126
127	/* Set the function pointers */
128	device->VideoInit = NDS_VideoInit;
129	device->ListModes = NDS_ListModes;
130	device->SetVideoMode = NDS_SetVideoMode;
131	device->CreateYUVOverlay = NULL;
132	device->SetColors = NDS_SetColors;
133	device->UpdateRects = NDS_UpdateRects;
134	device->VideoQuit = NDS_VideoQuit;
135	device->AllocHWSurface = NDS_AllocHWSurface;
136	device->CheckHWBlit = CheckHWBlit;
137	device->FillHWRect = NULL;
138	device->SetHWColorKey = NULL;
139	device->SetHWAlpha = NULL;
140	device->LockHWSurface = NDS_LockHWSurface;
141	device->UnlockHWSurface = NDS_UnlockHWSurface;
142	device->FlipHWSurface = NDS_FlipHWSurface;
143	device->FreeHWSurface = NDS_FreeHWSurface;
144	device->SetCaption = NULL;
145	device->SetIcon = NULL;
146	device->IconifyWindow = NULL;
147	device->GrabInput = NULL;
148	device->GetWMInfo = NULL;
149	device->InitOSKeymap = NDS_InitOSKeymap;
150	device->PumpEvents = NDS_PumpEvents;
151	device->info.blit_hw=1;
152
153	device->free = NDS_DeleteDevice;
154	return device;
155	}
156
157	VideoBootStrap NDS_bootstrap = {
158	NDSVID_DRIVER_NAME, "SDL NDS video driver",
159	NDS_Available, NDS_CreateDevice
160	};
161
162	u16* frontBuffer;// = (u16*)(0x06000000);
163	u16* backBuffer;// = (u16)(0x06000000 + 256 256 * 2);
164	int NDS_VideoInit(_THIS, SDL_PixelFormat *vformat)
165	{
166	//printf("WARNING: You are using the SDL NDS video driver!\n");
167
168	/* Determine the screen depth (use default 8-bit depth) */
169	/* we change this during the SDL_SetVideoMode implementation... */
170	vformat->BitsPerPixel = 16; // mode 3
171	vformat->BytesPerPixel = 2;
172	vformat->Rmask = 0x0000f800;
173	vformat->Gmask = 0x000007e0;
174	vformat->Bmask = 0x0000001f;
175	powerON(POWER_ALL);
176	irqInit();
177	irqSet(IRQ_VBLANK, on_irq_vblank);
178	irqEnable(IRQ_VBLANK);
179
180	//set the mode for 2 text layers and two extended background layers
181	//videoSetMode(MODE_5_2D \| DISPLAY_BG3_ACTIVE);
182	videoSetMode(MODE_6_2D\| DISPLAY_BG2_ACTIVE);
183
184	//set the sub background up for text display (we could just print to one
185	//of the main display text backgrounds just as easily
186	videoSetModeSub(MODE_0_2D \| DISPLAY_BG0_ACTIVE); //sub bg 0 will be used to print text
187
188	//set the first two banks as background memory and the third as sub background memory
189	//D is not used..if you need a bigger background then you will need to map
190	//more vram banks consecutivly (VRAM A-D are all 0x20000 bytes in size)
191	//vramSetMainBanks(VRAM_A_MAIN_BG_0x6000000, VRAM_B_MAIN_BG_0x6020000,VRAM_C_SUB_BG , VRAM_D_LCD);
192	vramSetMainBanks(VRAM_A_MAIN_BG,VRAM_B_MAIN_BG,VRAM_C_MAIN_BG,VRAM_D_MAIN_BG);
193	//vramSetBankA(VRAM_A_MAIN_BG);
194	//vramSetBankB(VRAM_B_MAIN_BG);
195	//vramSetBankC(VRAM_C_MAIN_BG);
196	//vramSetBankD(VRAM_D_MAIN_BG);
197	//vramSetBankE(VRAM_E_MAIN_BG);
198	//vramSetBankF(VRAM_F_MAIN_BG);
199	//vramSetBankG(VRAM_G_MAIN_BG);
200	vramSetBankH(VRAM_H_SUB_BG);
201	vramSetBankI(VRAM_I_LCD);
202
203	////////////////set up text background for text/////////////////////
204	SUB_BG0_CR = BG_MAP_BASE(8);
205
206	BG_PALETTE_SUB[255] = RGB15(31,31,31);//by default font will be rendered with color 255
207	///////////////set up our bitmap background///////////////////////
208
209	//BG3_CR = BG_BMP16_512x512;
210
211	//these are rotation backgrounds so you must set the rotation attributes:
212	//these are fixed point numbers with the low 8 bits the fractional part
213	//this basicaly gives it a 1:1 translation in x and y so you get a nice flat bitmap
214	/* BG3_XDX = 1<<8;
215	BG3_XDY = 0;
216	BG3_YDX = 0;
217	BG3_YDY = 1<<8;
218	//our bitmap looks a bit better if we center it so scroll down (256 - 192) / 2
219	BG3_CX = 0;
220	BG3_CY = 0;
221	*/
222	//consoleInit() is a lot more flexible but this gets you up and running quick
223	consoleInitDefault((u16)SCREEN_BASE_BLOCK_SUB(8), (u16)CHAR_BASE_BLOCK_SUB(0), 16);
224
225
226	frontBuffer =(u16*)(0x06000000);
227	//backBuffer =(u16)(0x06000000 + 1024 512*2);
228
229	//lcdSwap();
230	/* We're done! */
231	return(0);
232	}
233
234	SDL_Rect *NDS_ListModes(_THIS, SDL_PixelFormat format, Uint32 flags)
235	{
236	return (SDL_Rect **) -1;
237	}
238
239	SDL_Surface NDS_SetVideoMode(_THIS, SDL_Surface current,
240	int width, int height, int bpp, Uint32 flags)
241	{
242	Uint32 Rmask, Gmask, Bmask, Amask;
243
244	//if(width > 1024 \|\| height > 512 \|\| bpp > 16)
245	// return(NULL);
246
247	if(bpp >8) {
248	bpp=16;
249	Rmask = 0x0000001F;
250	Gmask = 0x000003E0;
251	Bmask = 0x00007C00;
252	Amask = 0x00008000;
253
254	videoSetMode(MODE_5_2D\| DISPLAY_BG2_ACTIVE);
255
256	vramSetMainBanks(VRAM_A_MAIN_BG,VRAM_B_MAIN_BG,VRAM_C_MAIN_BG,VRAM_D_MAIN_BG);
257
258	BG2_CR = BG_BMP16_512x512;
259	BG2_XDX = ((width / 256) << 8) \| (width % 256) ;
260	BG2_XDY = 0;
261	BG2_YDX = 0;
262	BG2_YDY = ((height / 192) << 8) \| ((height % 192) + (height % 192) / 3) ;
263	BG2_CX = 0;
264	BG2_CY = 0;
265	// for (i=0;i<256*192;i++)
266	// frontBuffer[i] = RGB15(31,0,0)\|BIT(15);
267	}
268	else
269	if(bpp <= 8) {
270	bpp=8;
271	Rmask = 0x00000000;
272	Gmask = 0x00000000;
273	Bmask = 0x00000000;
274	BG2_CR = BG_BMP8_1024x512;
275	BG2_XDX = ((width / 256) << 8) \| (width % 256) ;
276	BG2_XDY = 0;
277	BG2_YDX = 0;
278	BG2_YDY = ((height / 192) << 8) \| ((height % 192) + (height % 192) / 3) ;
279
280	}
281	else
282	if(bpp < 15) bpp=15;
283	if(width<=256) width=256;
284	else
285	if(width<256) width=256;
286	if(height<=192) height=192;
287	else
288	if(height<192) height=192;
289
290	if(bpp==8)
291	{
292	if(width<256) width=256;
293	if(height<192) height=192;
294	this->hidden->ndsmode=4;
295	}
296
297	if(bpp==15)
298	{
299	if(width<256) this->hidden->ndsmode=5;
300	else this->hidden->ndsmode=3;
301	}
302
303	this->hidden->buffer= frontBuffer;//NDS_VRAM_BASE;
304
305	//NDS_DISPCNT = NDS_DISP_MODE(this->hidden->ndsmode)\|NDS_DISP_BG2;
306
307	//fprintf(stderr,"Setting mode %dx%d (ndsmode %d)\n", width, height,this->hidden->ndsmode);
308
309	// FIXME: How do I tell that 15 bits mode is 555?
310
311	SDL_memset(this->hidden->buffer, 0, 1024 * 512* ((this->hidden->ndsmode==4 \|\| this->hidden->ndsmode==5) ? 2 : 1 ) * ((bpp+7) / 8));
312
313	/* Allocate the new pixel format for the screen */
314	if ( ! SDL_ReallocFormat(current, bpp, Rmask, Gmask, Bmask, Amask) ) {
315	this->hidden->buffer = NULL;
316	SDL_SetError("Couldn't allocate new pixel format for requested mode");
317	return(NULL);
318	}
319
320	/* Set up the new mode framebuffer */
321	current->flags = flags \| SDL_FULLSCREEN \| SDL_HWSURFACE \| (this->hidden->ndsmode > 0 ? SDL_DOUBLEBUF : 0);
322	this->hidden->w = current->w = width;
323	this->hidden->h = current->h = height;
324	current->pixels = frontBuffer;
325
326	if (flags & SDL_DOUBLEBUF) {
327	this->hidden->secondbufferallocd=1;
328	backBuffer=(u16)SDL_malloc(1024512*2);
329	current->pixels = backBuffer;
330	}
331	if(bpp==8)
332	current->pitch =1024;
333	else
334	current->pitch =512*2;
335
336	/* We're done */
337	return(current);
338	}
339
340	static int NDS_AllocHWSurface(_THIS, SDL_Surface *surface)
341	{
342	if(this->hidden->secondbufferallocd) {
343	//printf("double double buffer alloc\n");
344	return -1;
345	}
346	//if(this->hidden->ndsmode==3)
347	//{
348	// printf("no 2nd buffer in mode3\n");
349	// return -1;
350	//}
351	//printf("second buffer\n");
352	//this->hidden->secondbufferallocd=1;
353	//backBuffer=(u16)malloc(1024512*2);
354	//surface->pixels = backBuffer;
355
356	return(0);
357	}
358	static void NDS_FreeHWSurface(_THIS, SDL_Surface *surface)
359	{
360	//free(backBuffer);
361	this->hidden->secondbufferallocd=0;
362	}
363	int z=0;
364	/* We need to wait for vertical retrace on page flipped displays */
365	static int NDS_LockHWSurface(_THIS, SDL_Surface *surface)
366	{
367	/*
368	uint8* a = surface->pixels;
369	int i,j;
370	a += 5 * SCREEN_WIDTH + 5;
371	for( i = 0; i < 195; ++i) {
372	uint16* line = a + (SCREEN_WIDTH * i);
373	for( j = 0; j < 158; ++j) {
374	*line++ = RGB15(155,155,25);
375	}
376	}
377	*/
378	//if (z <256)
379	// BG_PALETTE[z++]=RGB15(255-z,z,255-z);
380
381
382	return(0);
383	}
384
385	static void NDS_UnlockHWSurface(_THIS, SDL_Surface *surface)
386	{
387	return;
388	}
389
390	static int NDS_FlipHWSurface(_THIS, SDL_Surface *surface)
391	{
392	if(this->hidden->secondbufferallocd){
393	while(DISP_Y!=192);
394	while(DISP_Y==192);
395	//printf("flip");
396
397	dmaCopyAsynch(backBuffer,frontBuffer,1024*512);
398	}
399	//printf("flip\n");
400	//u16* temp = surface->pixels;
401	//surface->pixels = frontBuffer;
402	//frontBuffer = temp;
403	/* u8* vram=BG_GFX;
404	int x,y;
405	for(y = 0; y < 512; y++)
406	dmaCopy(&frontBuffer[yrects->w], &vram[y512],512);
407	//unsigned char buf;
408
409	//printf("NDS_FlipHWSurface\n");
410	//printf("ptr now: 0x%x\n",surface->pixels);
411
412	while(DISP_Y!=192);
413	while(DISP_Y==192);
414	//swap
415	u16* temp = frontBuffer;
416	frontBuffer = backBuffer;
417	backBuffer = temp;
418
419	//flip
420	//base is 16KB and screen size is 256x256x2 (128KB)
421	BG2_CR ^= BG_BMP_BASE( 512 / 16 ); */
422	/*
423	if(surface->pixels == frontBuffer)//NDS_VRAM_BASE)
424	{
425	while(DISP_Y!=192);
426	while(DISP_Y==192);
427	//swap
428	u16* temp = backBuffer;
429	backBuffer = frontBuffer;
430	frontBuffer = temp;
431
432	//flip
433	//base is 16KB and screen size is 256x256x2 (128KB)
434	BG3_CR ^= BG_BMP_BASE( 128 / 16 );
435	}
436	else
437	{
438
439	while(DISP_Y!=192);
440	while(DISP_Y==192);
441	//swap
442	u16* temp = frontBuffer;
443	frontBuffer = backBuffer;
444	backBuffer = temp;
445
446	//flip
447	//base is 16KB and screen size is 256x256x2 (128KB)
448	BG3_CR ^= BG_BMP_BASE( 128 / 16 );
449
450	}
451	*/
452	//printf("ptr then: 0x%x\n",surface->pixels);
453
454	//printf("setting dispcnt to 0x%x\n",NDS_DISPCNT = NDS_DISP_MODE(this->hidden->ndsmode)\|NDS_DISP_BG2\| buf);
455	return(0);
456	}
457
458	static void NDS_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
459	{
460	//fprintf(stderr,"update\n");
461	/* do nothing. */
462	//dmaCopy(frontBuffer,BG_GFX,512*512);
463	/*
464	u8* vram=(u8*)BG_GFX;
465	int x,y;
466	for(y = 0; y < 512; y++)
467	dmaCopy(&frontBuffer[yrects->w], &vram[y512],512);
468	*/
469
470	}
471
472	int NDS_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
473	{
474	//printf("SetColors\n");
475	short r,g,b;
476
477	if(this->hidden->ndsmode != 4)
478	{
479	printf("This is not a palettized mode\n");
480	return -1;
481	}
482
483	int i,j=firstcolor+ncolors;
484	for(i=firstcolor;i<j;i++)
485	{
486	r=colors[i].r>>3;
487	g=colors[i].g>>3;
488	b=colors[i].b>>3;
489	BG_PALETTE[i]=RGB15(r, g, b);
490	}
491
492	return(0);
493	}
494
495	/* Note: If we are terminated, this could be called in the middle of
496	another SDL video routine -- notably UpdateRects.
497	*/
498	void NDS_VideoQuit(_THIS)
499	{
500	}