audio/maxmod/song_events_example2/source/template.c

/*  

    Simple Maxmod example - Song events   

    See http://www.maxmod.org/ref/tut/songevents.html for an explanation of song events.
    
    Example and mod file by Nyarla 
    (modified by Jason Rogers aka Dovoto)
*/



#include <nds.h>
#include <maxmod9.h>

#include "mmsolution.h"     // solution definitions
#include "mmsolution_bin.h" // solution binary reference 


// a simple sprite structure
typedef struct {
   u16* gfx;
   SpriteSize size;
   SpriteColorFormat format;
   int rotationIndex;
   int paletteAlpha;
   int x;
   int y;
   int dy;
}MySprite;


// create 5 sprites, one for each song event used
MySprite sprites[] = {  {0, SpriteSize_16x16, SpriteColorFormat_256Color, 0, 0, 20, 96, 0},
                        {0, SpriteSize_16x16, SpriteColorFormat_256Color, 0, 0, 70, 96, 0},
                        {0, SpriteSize_16x16, SpriteColorFormat_256Color, 0, 0, 120, 96, 0},
                        {0, SpriteSize_16x16, SpriteColorFormat_256Color, 0, 0, 170, 96, 0},
                        {0, SpriteSize_16x16, SpriteColorFormat_256Color, 0, 0, 220, 96, 0} };



//---------------------------------------------------------------------------------
// callback function to handle song events
//---------------------------------------------------------------------------------
mm_word myEventHandler( mm_word msg, mm_word param ) {
//---------------------------------------------------------------------------------

    switch( msg ) {

    case MMCB_SONGMESSAGE:  // process song messages

            if (param==1) sprites[0].dy = -8;
            if (param==2) sprites[1].dy = -8;
            if (param==3) sprites[2].dy = -8;
            if (param==4) sprites[3].dy = -8;
            if (param==5) sprites[4].dy = -8;
        
        break;
        
    case MMCB_SONGFINISHED: // process song finish message (only triggered in songs played with MM_PLAY_ONCE)
        
        break;
    }
    
    return 0;
}



//---------------------------------------------------------------------------------
int main(void) {
//---------------------------------------------------------------------------------

    int i = 0;
    
    videoSetMode(MODE_0_2D);
    videoSetModeSub(0);   // not using subscreen

    lcdMainOnBottom();
    
    //initialize the sprite engine with 1D mapping 128 byte boundary
    //and no external palette support
    oamInit(&oamMain, SpriteMapping_1D_32, false);

    vramSetBankA(VRAM_A_MAIN_SPRITE);
    
    for (i = 0; i < 5; i++) {
        //allocate some space for the sprite graphics
        sprites[i].gfx = oamAllocateGfx(&oamMain, sprites[i].size, sprites[i].format);

        //fill each sprite with a different index (2 pixels at a time)
        dmaFillHalfWords( ((i+1)<<8)|(i+1), sprites[i].gfx, 32*32);
    }

    //set indexes to different colours
    SPRITE_PALETTE[1] = RGB15(31,0,0);
    SPRITE_PALETTE[2] = RGB15(0,31,0);
    SPRITE_PALETTE[3] = RGB15(0,0,31);
    SPRITE_PALETTE[4] = RGB15(31,0,31);
    SPRITE_PALETTE[5] = RGB15(0,31,31);

    // initialise maxmod using default settings, and enable interface for soundbank that is loaded into memory
    mmInitDefaultMem( (mm_addr)mmsolution_bin );

    // setup maxmod to use the song event handler
    mmSetEventHandler( myEventHandler );
    
    // load song
    // values for this function are in the solution header
    mmLoad( MOD_EXAMPLE2 );

    // start song playing
    mmStart( MOD_EXAMPLE2, MM_PLAY_LOOP );

    while(1) {
        for (i=0; i < 5; i++) {
            // constantly increase the sprite's y velocity
            sprites[i].dy += 1;
        
            // update the sprite's y position with its y velocity
            sprites[i].y += sprites[i].dy;
        
            // clamp the sprite's y position
            if ( sprites[i].y<72 ) sprites[i].y = 72;
            if ( sprites[i].y>96 ) sprites[i].y = 96;
        
            oamSet( &oamMain,                   //main graphics engine context
                    i,                          //oam index (0 to 127)  
                    sprites[i].x,               //x and y pixel location of the sprite
                    sprites[i].y,           
                    0,                          //priority, lower renders last (on top)
                    sprites[i].paletteAlpha,    //palette index 
                    sprites[i].size,
                    sprites[i].format,
                    sprites[i].gfx,             //pointer to the loaded graphics
                    sprites[i].rotationIndex,   //sprite rotation data  
                    false,                      //double the size when rotating?
                    false,          //hide the sprite?
                    false, false, //vflip, hflip
                    false   //apply mosaic
                    );              
            }

        swiWaitForVBlank();
        
        //send the updates to the hardware
        oamUpdate(&oamMain);
    }

    return 0;
}