capture/ScreenShot/source/main.cpp

#include <nds.h>

#include <stdio.h>

#include "screenshot.h"

//a global copy of sprite attribute memory
SpriteEntry sprites[128];
//rotation attributes overlap so assign then to the same location
pSpriteRotation spriteRotations = (pSpriteRotation)&sprites[0];


//turn off all the sprites
void initSprites(void) {

    for(int i = 0; i < 128; i++) {

       sprites[i].attribute[0] = ATTR0_DISABLED;
       sprites[i].attribute[1] = 0;
       sprites[i].attribute[2] = 0;
       sprites[i].filler = 0;
    }
}
//copy our sprite to object attribute memory
void updateOAM(void) {

    DC_FlushRange(sprites,128*sizeof(SpriteEntry));
    dmaCopy(sprites, OAM, 128 * sizeof(SpriteEntry));
}

int main() {
 
    //enable vram and map it to the right places
    vramSetMainBanks(   VRAM_A_MAIN_SPRITE,        //A and B maped consecutivly as sprite memory
                        VRAM_B_MAIN_SPRITE,        //this gives us 256KB which is the max
                        VRAM_C_MAIN_BG_0x06000000, //map C to background memory
                        VRAM_D_LCD                 //not using D
                        ); 
   
   //set the video mode
    videoSetMode(  MODE_0_2D | 
                   DISPLAY_SPR_ACTIVE |    //turn on sprites
                   DISPLAY_BG0_ACTIVE |    //turn on background 0
                   DISPLAY_SPR_1D |        //this is used when in tile mode
                   DISPLAY_SPR_1D_BMP      //and this in bitmap mode
                    );

    
    consoleInit(0, 0,BgType_Text4bpp, BgSize_T_256x256, 31,0, true, true);
    
    //turn off the sprites
    initSprites();

    
// direct bitmap sprite
// print at using ansi escape sequence \x1b[line;columnH 
    iprintf("\x1b[1;1HDirect Bitmap:");
    sprites[0].attribute[0] = ATTR0_BMP | ATTR0_ROTSCALE_DOUBLE | 10; 
    sprites[0].attribute[1] = ATTR1_SIZE_32 | 20;
    sprites[0].attribute[2] = ATTR2_ALPHA(1)| 0;

    // red 32*32 square for 1d bitmap mode
    for(int i=0;i<32*32;i++)
        SPRITE_GFX[i]=RGB15(31,0,0)|(1<<15); //dont forget alpha bit

// 256 color sprite
// print at using ansi escape sequence \x1b[line;columnH 
    iprintf("\x1b[9;1H256 color:");
    sprites[1].attribute[0] = ATTR0_COLOR_256 | ATTR0_ROTSCALE_DOUBLE | 75;
    sprites[1].attribute[1] = ATTR1_SIZE_32 | 20; // size 64x64, x 10
    sprites[1].attribute[2] = 64;

    // Blue for 256 color sprite
    SPRITE_PALETTE[1]=RGB15(0,0,31);

    // blue 64*64 square for 256 color mode (must write two pixles at time)
    for(int i=0;i<32*16;i++)
        SPRITE_GFX[i+64*16]=(1<<8)|1;

// 16 color sprite
// print at using ansi escape sequence \x1b[line;columnH 
    iprintf("\x1b[16;1H16 color:");
    sprites[2].attribute[0] = ATTR0_COLOR_16 | ATTR0_ROTSCALE_DOUBLE | 135;
    sprites[2].attribute[1] = ATTR1_SIZE_32 | 20;
    sprites[2].attribute[2] = ATTR2_PALETTE(1) | 96;

    //yellow for 16 color sprite (it is using palette 1 so colors 16-31)
    SPRITE_PALETTE[17]=RGB15(31,31,0);

    // yellow 32*32 square for 16 color mode (must write 4 pixels at a time)
    for(int i=0;i<32*8;i++)
        SPRITE_GFX[i+96*16]=(1<<12)|(1<<8)|(1<<4)|1;



    int angle=0;
    
    //we tied all our sprites to the same rotation attributes (0)
    spriteRotations[0].hdx=256;
    spriteRotations[0].hdy=0;
    spriteRotations[0].vdx=0;
    spriteRotations[0].vdy=256;

    while(1)
    {
        angle+=64;
        
        spriteRotations[0].hdx = cosLerp(angle) >> 4;
        spriteRotations[0].hdy = sinLerp(angle) >> 4;
        spriteRotations[0].vdx = -spriteRotations[0].hdy;
        spriteRotations[0].vdy = spriteRotations[0].hdx;
        
        swiWaitForVBlank();
        
        u32 display_temp = 0;

        scanKeys();
        if(keysDown()&KEY_A) {
        
            screenshotbmp("shot.bmp");

            display_temp=REG_DISPCNT;
            REG_DISPCNT=MODE_FB1;

        }

        if(keysUp()&KEY_A) {
        
            videoSetMode(  MODE_0_2D | 
                DISPLAY_SPR_ACTIVE |    //turn on sprites
                DISPLAY_BG0_ACTIVE |    //turn on background 0
                DISPLAY_SPR_1D |        //this is used when in tile mode
                DISPLAY_SPR_1D_BMP |    //and this in bitmap mode
                DCAP_OFFSET(1));
        }

        
        updateOAM();
    }
}